Water Resources Data 
Puerto Rico and the 
U.S. Virgin Islands 
Water Year 1986 
:::.°1-1°°G6N.1988
P'.1 ic Abitill4)4Ik 
t/s, R cCt 
St. Thomas
Culebra. PR 
4CZe O*6 
St. Johr
Vieques. PR 
VIRGIN 
ISLANDS 
St. Croix 
U.S. GEOLOGICAL SURVEY WATER-DATA REPORT PR-86-1 
Prepared in cooperation with the Commonwealth of Puerto Rico, 
the Government of the U.S. Virgin Islands, and other agencies 
 
 
 
 
 
 
 
 
 
 
 
 
CALENDAR FOR WATER YEAR 1986 
1985 
OCTOBER 
NOVEMBER 
DECEMBER 
SMTWTF S 
S MTWT F 
S 
SMTW T 
F 
S 
1 
2 
3 
4 
5 
1 
2 
1 
2 
3 
4 
5 
6 
7 
6 
7 
8 
9 10 11 12 
3 
4 
5 
6 
7 
8 
9 
8 
9 10 11 12 13 14 
13 14 15 16 17 18 19 
10 11 12 13 14 15 16 
15 16 17 18 19 20 21 
20 21 22 23 24 25 26 
17 18 19 20 21 22 23 
22 23 24 25 26 27 28 
27 28 29 30 31 
24 25 26 27 28 29 30 
29 30 31 
1986 
JANUARY 
FEBRUARY 
MARCH 
SMTWTF S 
S MTWTF S 
SMTWTF S 
1 
2 
3 
4 
1 
1 
5 
6 
7 
8 
9 10 11 
2 
3 
4 
5 
6 
7 
8 
2 
3 
4 
5 
6 
7 
8 
12 13 14 15 16 17 18 
9 10 11 12 13 14 15 
9 10 11 12 13 14 15 
19 20 21 22 23 24 25 
16 17 18 19 20 21 22 
16 17 18 19 20 21 22 
26 27 28 29 30 31 
23 24 25 26 27 28 
23 24 25 26 27 28 29 
30 31 
APRIL 
MAY 
JUNE 
S MTWT F 
S 
S MTWTT 
F 
S 
SMTWT F 
S 
1 
2 
3 
4 
5 
1 
2 
3 
1 
2 
3 
4 
5 
6 
7 
6 
7 
8 
9 10 11 12 
4 
5 
6 
7 
8 
9 10 
8 
9 10 11 12 13 14 
13 14 15 16 17 18 19 
11 12 13 14 15 16 17 
15 16 17 18 19 20 21 
20 21 22 23 24 25 26 
18 19 20 21 22 23 24 
22 23 24 25 26 27 28 
27 28 29 30 
25 26 27 28 29 30 31 
29 30 
JULY 
AUGUST 
SEPTEMBER 
SMTW T 
F 
S 
SMTW T 
F 
S 
SMTWTF S 
1 
2 
3 
4 
5 
1 
2 
1 
2 
3 
4 
5 
6 
6 
7 
8 
9 10 11 12 
3 
4 
5 
6 
7 
8 
9 
7 
8 
9 10 11 12 13 
13 14 15 16 17 18 19 
10 11 12 13 14 15 16 
14 15 16 17 18 19 20 
20 21 22 23 24 25 26 
17 18 19 20 21 22 23 
21 22 23 24 25 26 27 
27 28 29 30 31 
24 25 26 27 28 29 30 
28 29 30 
31 
  
 
Water Resources Data 
Puerto Rico and the 
U.S. Virgin Islands 
Water Year 1986 
by Russell E. Curtis, Jr., Zaida Aquino, Pedro L. Diaz, and Rene Garcia 
Culebra, PR St. Thomas 
sC;:10 
fC 
) 
St. John 
Vieques, PR 
U.S. 
VIRGIN 
ISLANDS 
St. Crob 
U.S. GEOLOGICAL SURVEY WATER-DATA REPORT PR-86-1 
Prepared in cooperation with the Commonwealth of Puerto Rico, 
the Government of the U.S. Virgin Islands, and other agencies 
 
UNITED STATES DEPARTMENT OF THE INTERIOR 
DONALD PAUL HODEL, Secretary. 
GEOLOGICAL SURVEY 
Dallas L. Peck, Director 
For additional information on the water resources investigation programs 
in Puerto Rico and the U.S. Virgin islands write to: 
Chief, C ribbean District, Water Resources Division 
U.S. Geological Survey 
GPO Box 4424 
San Juan, PR 00936 
(Telephone: (809) 753-4414) 
 
ERRATA SHEET 
REPORT: WATER RESOURCES DATA - PUERTO RICO AND THE U.S. VIRGIN ISLANDS - WATER YEAR 1986 
PAGE 87.--
RIO GRANDE DE ARECIBO BASIN 
50028000 RIO TANAMA NEAR UTUADO, PR--Continued 
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
MEAN 
MEAN 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DAY 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
JULY 
AUGUST 
SEPTEMBER 
1 
41 
20 
2.2 
41 
25 
2.8 
68 
155 
80 
2 
41 
19 
2.1 
36 
13 
1.3 
43 
30 
3.5 
3 
40 
19 
2.1 
35 
14 
1.3 
35 
15 
1.4 
4 
39 
16 
1.7 
44 
37 
8.9 
33 
12 
1.1 
5 
40 
15 
1.6 
46 
50 
8.5 
30 
10 
.81 
6 
43 
13 
1.5 
35 
10 
.95 
28 
10 
.76 
7 
41 
15 
1.7 
126 
952 
3990 
27 
9 
.66 
8 
40 
18 
1.9 
57 
61 
10 
27 
9 
.66 
9 
38 
20 
2.1 
48 
58 
10 
27 
9 
.66 
10 
36 
20 
1.9 
51 
90 
36 
26 
9 
.63 
11 
45 
44 
8.1 
52 
83 
22 
25 
8 
.54 
12 
39 
18 
1.9 
36 
12 
1.2 
25 
8 
.54 
13 
35 
15 
1.4 
41 
26 
3.6 
25 
8 
.54 
14 
55 
91 
26 
36 
18 
1.7 
24 
8 
.52 
15 
60 
87 
21 
33 
15 
1.3 
22 
8 
.48 
16 
56 
87 
21 
30 
13 
1.1 
22 
8 
.48 
17 
98 
432 
680 
30 
13 
1.1 
25 
10 
.84 
18 
59 
93 
17 
30 
12 
.97 
26 
10 
.70 
19 
43 
50 
5.8 
30 
12 
.97 
23 
10 
.62 
20 
61 
105 
27 
30 
12 
.97 
22 
10 
.59 
21 
59 
65 
14 
28 
12 
.91 
22 
10 
.59 
22 
44 
25 
3.0 
29 
12 
.94 
28 
14 
1.2 
23 
42 
25 
2.8 
34 
18 
2.0 
25 
10 
.68 
24 
47 
37 
5.4 
33 
15 
1.6 
24 
9 
.58 
25 
43 
15 
1.7 
40 
51 
19 
26 
13 
1.2 
26 
41 
12 
1.3 
40 
28 
3.6 
23 
10 
.62 
27 
43 
14 
1.6 
29 
10 
.78 
21 
10 
.57 
28 
42 
12 
1.4 
36 
19 
2.2 
30 
20 
2.0 
29 
40 
12 
1.3 
60 
93 
39 
25 
10 
.68 
30 
42 
24 
3.0 
57 
103 
32 
22 
10 
.59 
31 
44 
27 
3.7 
39 
28 
2.9 
---
---
---
TOTAL 
1437 
867.2 
1292 
4209.59 
829 
104.74 
YEAR 
25021 
227330.80 
PAGE 213.-- "Figure 23.-- Rio Guanajibo basin" should read 
"Figure 20.-- Southeastern river basins-- Rio 
Humacao to Rio Seco basins." 
PAGE 249.-- "Figure 20.--Southeastern river basins--Rio Humacao to Rio Seco basins." should read "Figure 23.-­
Rio Guanajibo basin." 
 
iii 
PKKFACE 
This annual hydrologic data report of Puerto Rico and the U.S. Virgin 
Islands is one of a series of annual reports that document hydrologic data 
gathered from the U.S. Geological Survey's surface- and ground-water data-
collection networks in each state, Puerto Rico, the U.S. Virgin Islands, and 
the other Trust Territories. These records of streamflow, ground-water 
levels, and quality of water provide the hydrologic information needed by 
state, local and Federal agencies, and the private sector for developing and 
managing our Nation's land and water resources. 
The report is the culmination of a concerted effort by dedicated person­
nel of the U.S. Geological Survey, Water Resources Division who collected, 
compiled, analyzed, verified, and organized the data, and who typed, edited, 
and assembled the report. In addition to the authors, who had primary 
responsibility for assuring that the information contained herein is accurate, 
complete and adheres to Geological Survey policy and established guidelines, 
the following personnel contributed significantly to the collection, process­
ing and tabulations of the data: 
Jose M. Agis 
Karl Johnson 
George Arroyo 
Rafael Pena-Cortes 
Angel Class Cacho 
Ana V. Sanchez 
Eloy ColOn-Dieppa 
Luis Santiago-Rivera 
Iris M. Concepcion 
Luis Soler 
Carlos Figueroa 
Jose A. Torres 
Javier Garcia 
Heriberto Torres-Sierra 
Ralph Gonzdlez 
Ricardo J. Vachier 
Felipe Hernandez 
This report was prepared in cooperation with agencies of the Commonwealth. 
of Puerto Rico, the Government of the U.S. Virgin Islands, and with other 
federal agencies under the general supervision of Allen L. Zack, District 
Chief, Caribbean District, San Juan, Puerto Rico. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
VI 
ILLUSTRATIONS 
Page 
Figure 1. Graph showing monthly-mean discharge of selected streams 
in Puerto Rico 
4 
2. Graph showing ground-water levels at selected wells in 
Puerto Rico and the U.S. Virgin Islands 
6 
3. Map showing location of maximum concentration of fecal 
coliform bacteria at sampled sites 
10 
4. Map showing location of maximum concentration of fecal 
streptococci bacteria at sampled sites 
11 
5. Map showing location of continuous surface-water and 
crest-stage gage stations in Puerto Rico 
13 
6. Map showing location of water-quality stations in Puerto 
Rico 
14 
7. Map showing location of ground-water sEations in Puerto 
Rico 
15 
8. Map showing location of surface-water stations in the 
U.S. Virgin Islands 
16 
9. Map showing location of ground-water stations in the 
U.S. Virgin Islands 
17 
10. Grid showing system for numbering wells and miscellaneous 
sites (latitude and longitude) 
18 
11. Map showing the Rio Guajataca basin 
51 
12. Map showing the Rio Camuy basin 
63 
13. Map showing the Rio Grande de Arecibo basin 
69 
14. Map showing the Rio Grande de Manati basin 
93 
15. Map showing the Rio Cibuco basin 
111 
16. Map showing the Rio de la Plata basic. 
125 
17. Map showing the Rio Hondo to the Rio Puerto Nuevo basins. 
137 
18. Map showing the Rio Grande de Loiza basin 
153 
19. Map showing northeastern river basins--the Rio Herrera 
to the Rio Anton Ruiz basins 
189 
20. Map showing southeastern river basins--the Rio Humacao to 
the Rio Seco basins 
213 
21. Map showing south coast river basins--the Rio Salinas 
to the Rio Jacaguas basins 
227 
22. Map showing south coast river basins--the Rio Inabon 
to the Rio Loco basins 
233 
23. Map showing the Rio Guanajibo basin 
249 
24. Map showing the Rio Yaguez and the Rio Grande de Afiasco 
basins 
269 
25. Map showing the Rio Culebrinas basin 
279 
  
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
  
  
 
 
V 
CONTENTS 
Page 
Preface 
iii 
List of surface-water and water-quality stations, in downstream 
List of ground-water wells, by basin, for which records are 
order, for which records are published 
viii 
published 
xii 
Introduction 
1 
Cooperation 
2 
Summary of hydrologic conditions 
2 
Surface water 
3 
Ground water 
5 
Water quality 
7 
Special networks and programs 
9 
Explanation of records 
9 
Station identification numbers 
12 
Downstream order system 
12 
Latitude-longitude system 
12 
Records of stage and water discharge 
18 
Data collection and computation 
18 
Data presentation 
20 
Identifying estimated daily discharge 
23 
Accuracy of the records 
23 
Records of surface-water quality 
23 
Classification of records 
24 
Arrangement of records 
24 
On-site measurements and sample collection 
24 
Water temperature 
25 
Sediment 
26 
Laboratory measurements 
26 
Data presentation 
26 
Remark codes 
28 
Records of ground-water levels 
28 
Data collection and computation 
28 
Data presentation 
29 
Records of ground-water quality 
30 
Data collection and computation 
30 
Data presentation 
31 
Access to WATSTORE data 
31 
Definition of terms 
32 
Publications on Techniques of Water-Resources Investigations 
46 
Surface- and quality-of-water records for Puerto Rico 
49 
Discharge at partial-record stations in Puerto Rico 
287 
Water-quality at partial-record stations in Puerto Rico 
291 
Ground-water records for Puerto Rico 
300 
Surface-water records for the U.S. Virgin Islands 
335 
Ground-Water records for the U.S. Virgin. Islands 
341 
Index 
359 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5077? -tot 
1. REPORT NO. 
1t. 
.1. Recipient's Accession No
REPORT DOCUMENTATION 
PAGE 
USGS/WRD/HD-88/220 
4. Title end Subtitle 
6. Report Date 
April 1988 
Water Resources Data for Puerto Rico and the U.S. Virgin 
6. 
_Islands, Water Year 1986 
7. Author(s) 
S. Performing Organization Rept. No. 
USGS-WDR-PR-86-1
Russell E, Curtis, Jr., Zaida Aquino, Rene Garcia, Pedro Diaz 
9. Performing Organization Name and Address 
10. Project/Task/Work Unit No. 
11.
U.S. Geological Survey, Water Resources Division 
Contract(C) or Grant(G) No. 
G.P.O. Box 4424 
(C) 
San Juan, Puerto Rico 00936 
(G) 
12. Sponsoring Organization Name and Address 
13. Type of Report 4 Period Covered 
Annual-Oct. 1, 1985 
U.S. Geological Survey, Water Resources Division 
to Sept. 30, 1986 
G.P.O. Box 4424 
14. 
San Juan, Puerto Rico 00936 
15. Supplementary Notes 
Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of 
the U.S. Virgin Islands and other agencies. 
16. Abstract (Limit: 200 words) 
Water-resources data for surface-water, quality-of-water, and ground-water 
records for the 1986 water year for Puerto Rico and the U.S. Virgin Islands, 
consists of records of discharge, water quality of streams, and water levels of 
wells. This report contains discharge records for 50 streamflow-gaging stations, 
and 2 crest-stage, partial-record streamflow stations; stage records for 1 
lagoon; water quality records for 16 streamflow-gaging stations, 45 ungaged 
streamsites, 11 lake sites, 1 lagoon, and 1 bay; and water-level records for 57 
observation wells. These data represent that part of the National Water Data 
System collected by the U.S. Geological Survey and cooperating local and federal 
agencies in Puerto Rico and the U.S. Virgin Islands. 
17. Document Analysis 
a. Descriptors 
*Surface water, *Water quality, *Ground water, Aquifers, Chemical analysis, 
Gaging Stations, Hydrologic data, Sediments, Streamflow, Water analysis, Water 
levels, Lakes. 
b. Iciontifiers/Open•Ended Terms 
Puerto Rico, U.S. Virgin Islands, Sampling sites. 
c. COSATI Field/Group 
13. Availability Statement 
19. Security Class (This Report) 
21. No. of Pages 
NO RESTRICTION ON DISTRIBUTION 
UNCLASSIFIED 
376 
20. Security Class (This Page) 
22. Price 
UNCLASSIFIED 
___. 
as ANSI-239. 
See Mai/ructions on Mowers* 
OPTIONAL FORM 272 (4--
 
 
 
 
 
 
VII 
TABLES 
Page 
Table 1. Island-wide monthly precipitation averages for 1986 
water year 
2. Peak discharges during Oct. 6-7, 1985 at selected 
U.S. Geological Survey streamflow stations through-
out Puerto Rico 
3 
3. Highest water level (in feet below land-surface datum) 
recorded during 1985 water year at selected ground­
water wells in Puerto Rico and the U.S. Virgin 
Islands 
4. Sites with maximum concentration of selected parameters 
5. Factors for conversion of chemical constituents in milli-
grams per liter to milliequivalents per liter 
7 
8 
37 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
VIII 
SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, 
FOR WHICH RECORDS ARE PUBLISHED 
(Letter after station name designates type of data: 
(d) discharge, (c) water-quality, (e) elevation) 
Page 
RIO GUAJATACA BASIN 
Rio Guajataca at Lares (c) 
52 
Rio Guajataca above Lago Guajataca (d) 
54 
Canal Principal de Diversiones at Lago Guajataca (c) 
56 
Rio Guajataca below Lago Guajataca (d) 
58 
Rio Guajataca above mouth near Quebradillas (dc) 
60 
RIO CAMUY BASIN 
Rio Camuy near Bayaney (d) 
64 
Rio Camuy near Hatillo (d) 
66 
RIO GRANDE DE ARECIBO BASIN 
Rio Grande de Arecibo near Adjuntas (c) 
70 
Rio Grande de Arecibo near Utuado (c) 
72 
Rio Caonillas above Lago Caonillas near Jayuya (c) 
74 
Rio Grande de Arecibo below Lago. Dos Bocas near Florida (c) 
76 
Rio Grande de Arecibo above Arecibo (d) 
78 
Rio Tanama near Utuado (dc) 
80 
Rio Tanana at Charco Hondo (d) 
88 
Rio Grande de Arecibo at Central Cambalache (c) 
90 
RIO GRANDE DE MANATI BASIN 
Rio Orocovis near Orocovis (c) 
94 
Rio Grande de Manati near Morovis (dc) 
96 
Rio Grande de Manati at Ciales (d) 
99 
Rio Grande de Manati at Highway 149 at Ciales (c) 
101 
Rio Cialitos at Highway 649 at Ciales (c) 
103 
Rio Grande de Manati at Highway 2 near Manati (dc) 
105 
LAGUNA TORTUGUERO BASIN 
Laguna Tortuguero Outlet near Vega Baja (c) 
110 
RIO CIBUCO BASIN 
Rio Cibuco below Corozal (dc) 
112 
Rio Cibuco at Vega Baja (dc) 
115 
Drainage Ditch below Warner Lambert Laboratory near Sabana (c). 118 
Drainage Ditch at Rio Cibuco below Central San Vicente (c) 
120 
Rio Cibuco below Central San Vicente (c) 
122 
RIO DE LA PLATA BASIN 
Rio de La Plata at Proyecto La Plata (dc) 
126 
Rio de La Plata near Comerio (c) 
129 
Rio Guadiana near Naranjito (c) 
131 
Rio de La Plata at Toa Alta (c) 
133 
Rio de La Plata at Highway 2 near Toa Alta (d) 
136 
RIO HONDO BASIN 
Rio Hondo at Flood Channel near Cataflo (c) 
138 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
IX 
SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, 
FOR WHICH RECORDS ARE PUBLISHED—Continued 
Page 
RIO DE BAYAMON BASIN 
Rio de Bayamon near Aguas Buenas (c) 
140 
Rio Guaynabo near BayamOn (c) 
142 
Rio de Bayamon at Flood Channel at Bayamon (c) 
144 
RIO PUERTO JUE1.10 BASIN 
Rio Piedras: 
Rio Piedras near Rio Piedras (c) 
146 
Laguna San Jose: 
Bahia de San Juan: 
Rio Piedras at Hato Rey (c) 
148 
Laguna San Jose No.2 at San Juan (c) 
150 
Bahia de San Juan No.5 at San Juan (c) 
151 
QUEBRADA BLASINA BASIN 
Quebrada Blasina near Carolina (c) 
154 
RIO GRANDE DE LOIZA BASIN 
Rio Grande de Loiza at Quebrada Arenas (d) 
156 
Quebrada Blanca at El Jagual (d) 
Rio Gurabo: 
158 
Quebrada Salvatierra near San Lorenzo (d) 
160 
Rio Cayaguas at Cerro Gordo (d) 
162 
Rio Turabo at Borinquen (d) 
164 
Rio Grande de Loiza at Caguas (dc) 
166 
Rio Caguitas at Highway 30 at Caguas (c) 
169 
Rio Bairoa near Caguas (c) 
171 
Quebrada Caimito near Juncos (d) 
173 
Rio Valenciano near Juncos (d) 
175 
Quebrada Mamey near Gurabo (d) 
177 
Rio Gurabo at Gurabo (d) 
179 
Rio Gurabo near Gurabo (c) 
181 
Lago Loiza at Damsite (c) 
183 
Rio Grande de Loiza below Trujillo Alto (c) 
184 
Rio Canovanas near Campo Rico (d) 
186 
RIO ESPIRITU SANTO BASIN 
Quebrada Sonadora near El Verde (d) 
190 
Quebrada Toronja at El Verde (d) 
192 
Rio Espiritu Santo near Rio Grande (dc) 
194 
RIO MAMEYES BASIN 
Rio Mameyes near Sabana (d) 
197 
RIO SABANA BASIN 
Rio Sabana at Sabana (d) 
199 
RIO FAJARDO BASIN 
Rio Fajardo near Fajardo (dc) 
203 
Rio Fajardo below Fajardo (c) 
209 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
X 
SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, 
FOR WHICH RECORDS ARE PUBLISHED--Continued 
Page 
RIO BLANCO BASIN 
Rio Icacos near Naguabo (d) 
211 
RIO HUMACAO BASIN 
Rio Humacao at Highway 3 at Humacao (c) 
214 
RIO GUAYANES BASIN 
Rio Guayanes at Yabucoa (c) 
Rio Guayanes above mouth at Playa de Guayanes (c) 
216 
218 
RIO MAUNABO BASIN 
Rio Maunabo at Maunabo (c) 
220 
RIO CHICO BASIN 
Rio Chico at Providencia (c) 
222 
RIO GRANDE DE PATILLAS BASIN 
Rio Grande de Patillas near Patillas (dc) 
224 
RIO COAMO BASIN 
Rio Coamo near Coamo (c) 
228 
RIO DESCALABRADO BASIN 
Rio Descalabrado near Los Llanos (d) 
230 
RIO JACAGUAS BASIN 
Rio Jacaguas at Juana Diaz (d) 
231 
RIO INABON BASIN 
Rio Inabon at Real Abajo (d) 
234 
RIO BUCANA BASIN 
Rio Bucand: 
Rio Cerrillos near Ponce (c) 
236 
RIO PORTUGUES BASIN 
Rio Portugues near Ponce (dc) 
Rio Portugues at Ponce (c) 
238 
241 
RIO GUAYANILLA BASIN 
Rio Guayanilla near Guayanilla (d) 
Rio Guayanilla at Central Rufina (c) 
243 
244 
RIO LOCO BASIN 
Rio Loco at Guanica (c) 
246 
LAGUNA CARTAGENA BASIN 
Laguna Cartagena near Boqueron (e) 
Laguna Cartagena Outflow near Boqueron (d) 
250 
251 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
XI 
SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, 
FOR WHICH RECORDS ARE PUBLISHED--Continued 
Page 
LAGUNA JOYUDA BASIN 
Quebrada Mamey at Joyuda (d) 
253 
RIO GUANAJIBO BASIN 
Rio Guanajibo near San German (c) 
254 
Rio Rosario at Rosario (d) 
256 
Rio Rosario near Hormigueros (dc) 
257 
Rio Guanajibo near Hormigueros (dc) 
265 
RIO YAGUEZ BASIN 
Rio YagUez near Mayaguez (c) 
270 
RIO GRANDE DE AFTASCO BASIN 
Rio Grande de Afiasco near Lares (c) 
272 
Rio Grande de Afiasco near San Sebastian (dc) 
274 
Rio Grande de Afiasco near Afiasco (c) 
277 
RIO CULEBRINAS BASIN 
Rio Culebrinas near San Sebastian (c) 
280 
Rio Culebrinas at Highway 404 near Moca (d) 
282 
Rio Culebrinas near Aguada (c) 
284 
ST. THOMAS, U.S. VIRGIN ISLANDS 
Bonne Resolution Gut at Bonne Resolution (d) 
337 
Turpentine Run at Mariendal (d) 
338 
ST. JOHN, U.S. VIRGIN ISLANDS 
Guinea Gut at Bethany (d) 
339 
ST. CROIX, U.S. VIRGIN ISLANDS 
Jolly Hill Gut at Jolly Hill (d) 
 340 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 305 
 310 
 315 
 320 
 325 
 330 
XH 
GROUND-WATER WELLS, BY BASIN, FOR WHICH RECORDS ARE PUBLISHED 
Page 
RIO GUAJATACA BASIN 
Well 182422067015100 Local number 165 
303 
Well 182647066552400 Local number 202 
304 
RIO CAMUY BASIN 
Well 182856066510700 Local number 203 
RIO GRANDE DE ARECIBO BASIN 
Well 182737066370900 Local number 204 
306 
RIO GRANDE DE MANATI BASIN 
Well 182621066343300 Local number 135 
307 
Well 182757066325600 Local number 206 
308 
Well 182710066303700 Local number 207 
309 
Well 182534066283000 Local number 208 
Well 182634066262500 Local number 209 
311 
Well 182308066260400 Local number 210 
312 
RIO CIBUCO BASIN 
Well 182647066201700 Local number 70 
313 
Well 182615066235300 Local number 211 
314 
Well 182515066194000 Local number 212 
Well 182330066185700 Local number 213 
316 
RIO DE LA PLATA BASIN 
Well 182746066170800 Local number 214 
317 
Well 182548066171200 Local number 215 
318 
Well 182530066135400 Local number 216 
319 
Well 182655066142400 Local number 217 
RIO HONDO TO RIO PUERTO NUEVO BASINS 
Well 182623066111000 Local number 218 
321 
Well 182441066082600 Local number 219 
322 
Well 182413066044000 Local number 220 
323 
Well 182436066031200 Local number 221 
324 
RIO GRANDE DE LOIZA BASIN 
Well 182515065594100 Local number 222 
RIO HUMACAO TO RIO SECO BASINS 
Well 175858066100200 Local number 6 
326 
Well 180415065513900 Local number 96 
327 
RIO SALINAS TO RIO JACAGUAS BASINS 
Well 175829066232100 Local number 87 
328 
RIO INABON TO RIO LOCO BASINS 
Well 180133066503300 Local number 132 
329 
Well 175950066354200 Local number 141 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
XIII 
RIO GUANAJIBO BASIN 
Well 180132067033800 Local number 143 
331 
RIO CULEBRINAS BASIN 
Well 182018066593200 Local number 83 
332 
Well 182442067091700 Local number 200 
333 
ST. CROIX, U.S. VIRGIN ISLANDS 
Well 174225064471900 Local number 1 
343 
Well 174225064472000 Local number 2 
344 
Well 1;4243064475100 Local number 3 
345 
Well 174245064475800 Local number 4 
346 
Well 174336064523200 Local number 5 
346 
Well 174308064484400 Local number 6 
347 
Well 174525064460600 Local number 7 
348 
Well 174527064460100 Local number 8 
348 
Well 174532064460300 Local number 9 
349 
Well 174329064454700 Local number 10 
349 
ST. THOMAS, U.S. VIRGIN ISLANDS 
Well 182050064580400 Local number 1 
350 
Well 182138064543100 Local number 2 
350 
Well 182138064542500 Local number 3 
350 
Well 182136064541900 Local number 4 
351 
Well 182029064535200 Local number 5 
351 
Well 182038064550300 Local number 6 
352 
ST. JOHN, U.S. VIRGIN ISLANDS 
Well 182010064472600 Local number 1 
353 
Well 182109064460300 Local number 2 
353 
Well 182116064451000 Local number 3 
354 
Well 182042064454500 Local number 5 
355 
Well 182044064454600 Local number 6 
356 
Well 182044064454800 Local number 7 
356 
Well 182044064454900 Local number 8 
356 
Well 182044064455000 Local number 9 
357 
Well 182044064455200 Local number 10 
357 
Well 181956064464500 Local number 11.... 
358 
 
1 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
INTRODUCTION 
The Water Resources Division of the U.S. Geological Survey, in coopera­
tion with local and federal agencies obtains a large amount of data pertaining 
to the water resources of the Commonwealth of Puerto Rico and the Territory of 
the U.S. Virgin Islands each water year. These data, accumulated during many 
water years, constitute a valuable data base for developing an improved 
understanding of the water resources of the area. To make these data readily 
available to inLerested parties outside the Geological Survey, the data are 
published annually in this report series entitled "Water Resources Data for 
Puerto Rico and the U.S. Virgin Islands, 1986." 
This report includes records on both surface and ground water. Specifi­
cally, it contains: (1) Discharge records for 50 streamflow-gaging stations, 
and 2 crest-stage, partial-record streamflow station; (2) stage records for 1 
lagoon; (3) water-quality records for 16 streamflow-gaging stations, and for 
45 ungaged streamsites, 11 lake sites, 1 lagoon, and 1 bay; and (4) water-
level records for 57 observation wells. 
Water-resources data for Puerto Rico for calendar years 1958-67 were 
released in a series of reports entitled "Water Records of Puerto Rico". 
Water-resources data for the U.S. Virgin Islands for the calendar years 
1962-69 were released in a report entitled "Water Records of U.S. Virgin 
Islands." Included were records of streamflow, ground-water levels, and 
water-quality data for both surface and ground water. 
Beginning with the 1968 calendar year, surface-water records for Puerto 
Rico were released separately on an annual basis. Ground-water level records 
and water-quality data for surface and ground water were released in companion 
reports covering periods of several years. Data for the 1973-74 reports were 
published under separate covers. Water-resources data reports for 1975-76, 
1977, 1978, 1979-80, 1981-82, 1983, 1984, and 1985 water years consist of one 
volume each and contain data for streamflow, water quality and ground water. 
Publications similar to this report are published annually by the Geolog­
ical Survey for all States. These official Survey reports have an identifica­
tion number consisting of the two-letter State abbreviation, the last two 
digits of the water year, and the volume number. For example, this volume is 
identified as "U.S. Geological Survey Water-Data Report PR-86-1". 
These 
water-data reports are for sale in paper copy or in microfiche by the National 
Technical Information Service, U.S. Department of Commerce, Springfield, 
Virginia, 22161. 
Additional information, including current prices, for ordering specific 
reports may be obtained from the District Chief at the address given on back 
of title page or by telephone (809) 783-4660. 
 
2 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
COOPERATION 
The U.S. Geological Survey has had cooperative agreements with organiza­
tions of the Commonwealth of Puerto Rico and the Territory of the U.S. Virgin 
Islands for the systematic collections of water resources data since 1958. 
Organizations that supplied data are acknowledged in the station descriptions. 
Organizations that assisted in collecting data through cooperative agreements 
with the Survey are: 
Puerto Rico Environmental Quality Board 
Puerto Rico Aqueduct and Sewer Authority 
Puerto Rico Department of Agriculture 
Puerto Rico Industrial Development Company 
Puerto Rico Department of Public Works 
Puerto Rico Highway Authority 
Puerto Rico Department of Natural Resources 
Puerto Rico Department of Health 
Puerto Rico Electric and Power Authority 
Puerto Rico Rice Corporation 
Puerto Rico Administration for Agricultural Development 
Puerto Rico Land Administration 
Center for Energy and Environment Research, University 
of Puerto Rico 
Water Resources Research Institute, University of 
Puerto Rico 
Water Resources Research Institute, College of the. 
Virgin Islands 
Department of Public Works of the U.S. Virgin Islands 
Funds were also provided by the Corps of Engineers, U.S. Army, for the 
collection of records at five gaging stations published in this report. 
Ground-water quality data at selected sites was collected with support from 
the U.S. Environmental Protection Agency. 
SUMMARY OF HYDROLOGIC CONDITIONS 
Precipitation was slightly higher than usual in the 1986 water year. The 
average was about 118 percent of normal, islandwide, with variations of 116 
percent normal in the north; 123 percent normal in the south; 120 percent 
normal in the east; and 112 percent normal in the west. Monthly average 
precipitation islandwide for water year 1986 and the 30-year normal as 
reported by the National Oceanic and Atmospheric Admministration are listed in 
table 1. 
 
 
 
3 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Table 1. Island-wide monthly precipitation averages for 1986 water year 
30-year 
Water year 1986 
normal 
(inches) 
(inches) 
Oct. 
20.60 
7.74 
Nov. 
6.58 
5.95 
Dec. 
1.64 
4.32 
Jan. 
2.56 
3.08 
Feb. 
1.76 
2.29 
Mar. 
2.67 
2.62 
Apr. 
7.41 
4.63 
May 
15.14 
6.48 
June 
2.97 
5.58 
July 
4.11 
4.48 
Aug. 
6.00 
7.28 
Sept. 
3.17 
7.78 
TOTAL 
74.61 
62.23 
Surface Water 
Streamflow in Puerto Rico was generally within normal range during the 
1986 water year (fig. 1). During October it was well above normal due to 
increased precipitation caused by a tropical wave. This event produced 
monthly-mean discharges that were 162 to 522 percent of the long-term median 
at all index stations. Historical maximum peak flows were recorded for some 
sites and are shown in table 2. 
An estimated 180 people died, and millions 
of dollars in losses occurred as a result of severe floods and landslides in 
the southern and central areas. Streamflow began to decrease to the normal 
range during November, but was still excessive in the northern and eastern 
areas. 
From December to March, streamflow decreased seasonally to normal levels, 
although some stations were slightly below or above average. After this 
moderate drought season, above normal precipitation during April increased 
streamflow above the long-term median with normal to excessive flows. They 
continued increasing during May when the highest and second highest monthly-
mean flows were exceeded at Rio Grande de Afiasco near San Sebastian on the 
west coast, and Rio Grande de Manati on the north coast. However, the 
northern and eastern areas were the most affected, where some gaging stations 
recorded maximum peak discharges for the water year. Similar high-flow 
conditions persisted for the west and north coasts during June and July, but 
flow began to decline to normal limits in the eastern and southern areas by 
June, and was lower than usual by July. 
 
 
 
 
 
 
 
 
 
 
 
 
 
4
4 
RIO GRANDE DE AIjASCO NEAR 
RIO GRANDE DE MANATI 
SAN SEBASTIAN (50144000) 
AT HWY 2 (50038100) 
2000 
8000 
' "vxxxknknkkkk 
CURRENT YEAR Oftwfto
AM:441APe 
1000 
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1000 
•Al*
100 
44$$$$ 
M ONTHLY MEANDISCHARGE, INCUBICFEETPER SECOND 
100 
50 
RIO FAJARDO NEAR FAJARDO 
(50071000) 
1000 
144$04444mv 
.4Ag**Wo‘
1$$$$$$*ht 
44$$$$W 
100 
$OW 
10 
3 
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1985 
1986 
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4 
30 
RIO INABON AT REAL ABAJO 
(50112500) 
MONTH LY MEANDISCHARGE, INCUBICFEETPERSECOND 
Unshaded area indicates range between highest and lowest record for the month 
Figure 1.--Monthly mean discharge of selected streams in Puerto Rico. 
 
 
 
5 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
In August increased flows occurred islandwide and averaged 109 percent 
above the long-term median, compared with an average of 38 percent of the 
median during September. Steamflow ranged from about 28 percent of the median 
in Rio Inabon at Real Abajo to 137 percent of the median in Rio Fajardo near 
Fajardo. Record low flows for August occurred at two index stations. 
Monthly-mean discharges at Rio Inabon at Real Abajo and Rio Grande de Afiasco 
near San Sebastian sites were an all-time low for the entire period of record 
(23 years) at those sites. 
In the U.S. Virgin Islands, conditions were generally the same as in 
Puerto Rico. The passing of the tropical wave during October 1985, produced 
precipitation 224 percent above the 30-year norm for this month. For the rest 
of the year it was below normal except for April and May when it was 260 and 
226 percent above normal respectively. 
Table 2. Peak discharges during October 6-7, 1985 at selected U.S. Geological Survey 
streamflow gaging stations throughout Puerto Rico 
1986 peak Previous maximum of record 
Period 
Station 
Station 
(Cubic feet 
(Cubic feet 
Water 
of 
number 
name 
per second) 
per second) 
Year 
Record 
50011200 Rio Guajataca below 
1,350 
624 
1985 
8-69 to 12-70, 
Lago de Guajataca 
4-84 to 9-86 
50014800 Rio Camay near Bayaney 
6,450 
3,510 
1985 
5-84 to 9-86 
50015700 Rio Camuy near Hatillo 
10,500 
6,250 
1985 
6-84 to 9-86 
50038100 Rio Grande de Manati 
97,200 
90,000(revised) 1985 
10-63 to 9-68, 
Highway 2 near Manati 
2-70 to 9-86 
50055650 Quebrada Caimito 
992 
700 
1985 
1-84 to 9-86 
near Juncos 
50108000 Rio Descalabrado near 
30,000 
7,000 
1969 
1-66 to 12-69, 
Los Llanos 
2-84 to 9-86 
50111500 Rio Jacaguas at 
40,000 
12,700 
1985 
3-84 to 9-86 
Juana Diaz 
50112500 Rio Inabon at Real Abajo 
19,000 
5,720 
1970 
7-64 to 7-70, 
4-71 to 9-86 
50115000 Rio Portugues near Ponce 
21,000 
13,100 
1975 
7-64 to 9-86 
Ground Water 
In general, ground-water levels in selected wells rose during October and 
May in response to above-normal rainfall. New record-high water levels were 
recorded at several wells in Puerto Rico and the U.S. Virgin Islands (Table 
3). 
 
 
 
 
 
 
 
 
 
6 
WATER LEVEL INFEETBELOW LAND-SURFACE DATUM 
275 
14 
T 
4 
WELL 135, LEDERLE 
BARCELONETA, P.R. 
280 
285 
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 
1985 
1986 
15 
20 
25 
+"1.11\114 ,J1 
30 
WELL 87, ALOMAR 1 
SANTA ISABEL, P.R. 
35 
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 
1985 
1986 
0 
► 
► 
► 
► 
10 
20 
WELL 11, GUINEA GUT 
ST. JOHN, U.S.V.I. 
30 
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 
1985 
1986 
Figure 2.--Ground-water levels at selected wells in Puerto Rico and the 
U.S. Virgin Islands. 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Ground-water levels along the north coast limestone aquifers of Puerto 
Rico remained practically unchanged during the first half of the water year 
(fig. 2). Above normal rainfall during mid-May caused a significant rise in 
the water levels. At the Lederle recording well, an increase of 2.5 ft was 
registered. The water levels declined during the rest of the period, reachirig 
nearly steady conditions by September 1986. 
Ground-water levels in the south coast alluvial aquifers of Puerto Rico 
followed a cyclic pattern associated with rainfall and ground-water 
withdrawals for public supply, industrial, and irrigation uses. Above-normal 
rainfall produced by a tropical depression that affected south-central Puerto 
Rico during October 6-7, 1985, caused a significant rise in the water levels 
(fig. 2). At the Alomar well, an increase of 4.5 ft in the water levels was 
recorded, while at nearby recording wells a maximum increase of 22.0 ft was 
recorded. The water levels decreased during the rest of the year in response 
to water demand for irrigation and diminished precipitation. 
Table 3. Highest water level and previous extreme (in feet below land-surface 
datum) recorded during 1986 water year at selected ground-water wells 
in Puerto Rico and the U.S. Virgin Islands 
Well 
Local Location 
1986 
Date 
Previous 
Date 
Period of 
Name 
no. 
extreme 
extreme 
Record 
Yabucoa #7 
96 
PR 
13.39 11-18-85 15.38 
12-09-84 
4-78 to 9-86 
Restaurada 8A 
141 
PR 
11.19 10-09-85 15.65 
08-20-83 
10-81 to 9-86 
Vivoni well 
143 
PR 
37.86 11-20-85 38.00 
09-19-82 
12-81 to 9-86 
Guinea Gut 
11 St. John 
3.05 06-13-86 
3.34 
05-25-82 
3-82 to 9-86 
Fairplains #2 
2 St. Croix 
20.91 11-27-85 21.80 
01-03-84 
6-83 to 9-86 
Grade School 3 
6 St. Thomas 
3.72 05-22-86 
5.19 
11-27-84 
3-82 to 9-86 
Ground-water levels in the U.S. Virgin Islands (St. Thomas, St. Croix, 
and St. John) responded to the same climatological conditions that affected 
Puerto Rico. Above-normal rainfall during October and May resulted in an 
increase in water levels of 17.8 ft. and 20.5 ft respectively at the Guinea 
Gut recording well (fig. 2). 
Water Quality 
As part of the ongoing interagency agreement, the U.S. Geological Survey 
completed the second year of sampling for selected parameters which were added 
to the regular schedule in 1985. These parameters are part of a wider set of 
constituents studied to detect the effects of pollution on the streams and 
lakes in Puerto Rico. 
 
8 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Table 4. 
Sites with maximum concentration of selected parameters 
Boron 
Copper 
Manganese 
B 
Cu 
Mn 
Site number 
50047530 
50055250 
50146000 
Site name 
Rio Hondo at 
Rio Caguitas 
Rio Grande de 
flood channel 
at Highway 30 
Afiasco near 
near Catafio 
at Caguas 
Afiasco 
Maximum 
0.97 mg/L 
0.22 mg/L 
1.7 mg/L 
concentrations 
Iron 
Zinc 
Cyanide 
Fe 
Zn 
Site number 
50146000 
50063800 
50-055250 
Site name 
Rio Grande de 
Rio Espiritu 
Rio Caguitas 
Afiasco near 
Santo near El 
at Highway 30 
Afiasco 
Verde Rio Grande at Caguas 
Maximum 
50 mg/L 
0.24 mg/L 
0.220 mg/L 
concentrations 
Phenols 
Sulfide 
MBAS * 
Site number 
50091800 
50048800 
50091800 
Site name 
Rio Chico at 
Rio Piedras 
Rio Chico at 
Providencia 
near Rio Piedras Providencia 
Maximum 
42 mg/L 
14 mg/L 
5,1 mg/L 
concentrations 
* MBAS - Methylene blue active substances. 
9 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
The presence of high concentrations of fecal coliform (FC) and fecal 
streptococci (FS) bacteria continue being the principal water quality 
problem of Puerto Rico. Bacteria concentrations exceeding one million 
colonies per hundred milliliters of raw water were found at several 
stations including Rio Hondo at flood channel near Cataiio (50047530), Rio 
Piedras at Hato Rey (50049100), Rio Caguitas at Highway 30 at Caguas 
(50055250), Rio Bairoa near Caguas (50055400), and Rio Chico at Central 
Providencia (50091800) (fig. 3 and 4). These sites are located close to urban 
zones, industrial parks, and suburban zones and receive the direct discharge 
from sewage treatment plants. 
Three suspended sediment stations were operated during the year at 
Rio Tanana near Utuado (50028000), located in the north central part of 
the island; Rio Fajardo near Fajardo (50071000) in the east, close to El 
Yunque Rain Forest; and Rio Rosario near Hormigueros (50136400) in the 
west, close to the Maricao Forest Reserve. Maximum sediment 
concentrations recorded were 9,340 mg/L at 50028000, 2,210 mg/L at 
50071000, and 8,150 mg/L at 50136400. Maximum sediment loads were 79,900 
tons per day (ton/d) at 50028000, 22,100 ton/d at 50071000, and 74,700 
ton/d at 50136400. 
SPECIAL NETWORKS AND PROGRAMS 
National Stream Quality Accounting Network (NASQAN) is a nationwide 
data-collection network designed by the U.S. Geological Survey to meet many of 
the information needs of government agencies and other groups involved in 
natural or regional water-quality planning and management. The 500 or so 
sites on NASQAN are generally located at the downstream ends of hydrologic 
accounting units designated by the U.S. Geological Survey Office of.Water Data 
Coordination in consultation with the Water Resources Council. The objectives 
of NASQAN are (1) to obtain information on the quality and quantity of water 
moving within and from the United States through a systematic and uniform 
process of data collection, summarization, analysis, and reporting such that 
the data may be used for, (2) description of the areal variability of water 
quality in the Nation's rivers through analysis of data from this and other 
programs, (3) detection of changes or trends with time in the pattern of 
occurrence of water-quality characteristics, and (4) providing a nationally 
consistent data base useful for water-quality assessment and hydrologic 
research. 
EXPLANATION OF THE RECORDS 
The surface-water and ground-water records published in this report are 
for the 1986 water year that began October 1, 1985 and ended September 30, 
1986. A calendar of the water year is provided on the inside of the front 
cover. The records contain streamflow data, stage and content data for lakes 
and reservoirs, water-quality data for surface and ground water, and ground-
water-level data. The locations of the stations and wells where the data were 
collected are shown in figures 3 to 9. The following sections of the 
introductory text are presented to provide users with a more detailed 
explanation of how the hydrologic data published in this report were 
collected, analyzed, computed, and arranged for presentation. 
  
  
  
 
 
  
 
 
 
 
 
 
  
 
  
 
 
 
 
 
1 
67°15' 
67°00' 
18030' 
Rio Cuiabrira 
Rio i.,uayabo 
Rio Grand 
Rio Grande 
de /Masco 
Rio Yaguez 
Rio Guanajibo 
l6°00' 
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210 KILOMETERS 
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Rio Fajardo 
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brada Palma 
Rio Santiago 
Rio Bianco 
Rio Antall Ruiz 
Rio Humacao 
to Guayana's 
FECAL COLIFORMS 
• 
< 
1000 
• 
1000 - 10,000 
II 10,000 - 100,000 
11100,000 - 1.000,000 
> 
1,000,000 
Figure 3.--Location of maximum concentration of fecal coliform bacteria at 
sampled sites. 
I 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
  
 
 
   
 
  
 
 
 
  
45' 
65°30'
67°15' 
67°00' 
4 ' 
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66°00'
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de Masco
15' 
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Rio Guanajibo 
\ Rio Santiago 
Rio Blanco 
Rio Antol, Ruiz 
Rio Humacao 
to Guayaas 
18°00'I-
oo 
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Figure 4.--Location of maximum concentration of fecal streptococci bacteria 
at sampled sites. 
12 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Station Identification Numbers 
Each data station, whether streamsite or well, in this report is assigned 
a unique identification number. This number is unique in that it applies 
specifically to a given station and to no other. The number usually is 
assigned when a station is first established and is retained for that station 
indefinitely. The systems used by the U.S. Geological Survey to assign 
identification numbers for surface-water stations and for ground-water well 
sites differ, but both are based on geographic location. The "downstream 
order" system is used for regular surface-water stations and the "latitude­
longitude" system is used for wells. 
Downstream order system 
Since October 1, 1950, the order of listing hydrologic-station records in 
Survey reports is in a downstream direction along the main stream. All 
stations on a tributary entering upstream from a main-stream station are 
listed before that station. A station on a tributary that enters between two 
main-stream stations is listed between them. A similar order is followed in 
listing stations in first rank, second rank, and other ranks of tributaries. 
As an added means of identification, each hydrologic station and 
partial-record station has been assigned a station number. These are in the 
same downstream order used in this report. In assigning station numbers, no 
distinction is made between partial-record stations and other stations; 
therefore, the station number for a partial-record station indicates down­
stream order position in a list made up of both types of stations that may be 
established; hence, the numbers are not consecutive. The complete 8-digit 
number for each station such as 50028000, which appears just to the left of 
the station name, includes the 2-digit part number "50" plus the 6-digit 
downstream order number "028000." 
Latitude-Longitude System 
The 8-digit downstream order station numbers are not assigned to wells 
and miscellaneous sites where only random water-quality samples or discharge 
measurements are taken. 
The well and miscellaneous site numbering system of the U.S. Geological 
Survey is based on the grid system of latitude and longitude. The system 
provides the geographic location of the well or miscellaneous site and a 
unique number for each site. The number consists of 15 digits. The first 6 
digits denote the degrees, minutes, and seconds of latitude, the next 7 digits 
denote degrees, minutes, and seconds longitude, and the last 2 digits 
(assigned sequentially) identify the wells or other sites within a 1-second 
grid. The numbers shown in the grid correspond to the local numbers assigned 
to each well as visited in the field. An example is well 16 (fig. 10). 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
67015' 
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stations in Puerto Rico. 
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Figure 6.--Location of water-quality stations in Puerto Rico. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
 
 
  
  
 
 
 
 
    
 
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Figure 7.--Location of ground-water stations in Puerto Rico. 
rt 
 
 
 
 
 
 
   
 
16. 
65°05' 
2 3 4 KILOMETERS 
3 4 MILES 
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Figure 8.--Location of surface-water stations in the U.S. Virgin Islands. 
17 
°METERS 
1 
4 MILES 
Figure 9.--Location of ground-water stations in the U.S. Virgin Islands. 
18 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
66°53' 52' 51' 50' 49' 48' 66°47' 
18°02' 
0I' 
134 
132•1 
*27 
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COORDINATES FOR WELLS 27 (180150066474900) 
AND 74 (1801350664 7 1000) 
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AND 134 (1801200665032001 
18 0 0T 
17 0 59' 
16
41
COORDINATES FOR WELL 131 (180058066502700) 
COORDINATES FOR WELL 16 (175922088495800) 
Figure 10.--Grid showing system for numbering wells and miscellaneous 
sites (latitude and longitude). 
Records of Stage and Water Discharge 
Records of stage and water discharge may be complete or partial. 
Complete records of discharge are those obtained using a continuous stage-
recording device through which either instantaneous or mean daily discharges 
may be computed for any time, or any period of time, during the period of 
record. Complete records of lake or reservoir content, similarly, are those 
for which stage or content may be computed or estimated with reasonable 
accuracy for any time, or period of time. They may be obtained using a 
continuous stage-recording device, but need not be. Because daily mean 
discharges and end-of-day contents commonly are published for such stations, 
they are referred to as "daily stations." 
By contrast, partial records are obtained through discrete measurements 
without using a continuous stage-recording device and pertain only to a few 
flow characteristics, or perhaps only one. The nature of the partial record 
is indicated by table titles such as "Crest-stage partial records," or "Low­
flow partial records." Records of miscellaneous discharge measurements or of 
measurements from special studies, such as low-flow seepage studies, may be 
considered as partial records, but they are presented separately in this type 
of report. Location of all complete-record and crest-stage partial-record 
stations for which data are given in this report are shown in figures 5 and 8. 
Data Collection and Computation 
The data obtained at a complete-record gaging station on a stream or 
canal consists of a continuous record of stage, individual measurements of 
discharge throughout a range of stages, and notations regarding factors that 
may affect the relationships between stage and discharge. These data, 
together with supplemental information, such as weather records, are used to 
compute daily discharges. The data obtained at a complete-record gaging 
station on a lake or reservoir consist of a record of stage and of notations 
regarding factors that may affect the relationship between stage and lake 
content. These data are used with stage-area and stage-capacity curves or 
tables to compute water-surface areas and lake storage. 
19 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Continuous records of stage are obtained with analog recorders that trace 
continuous graphs of stage or with digital recorders that punch stage values 
on paper tapes at selected time intervals. Measurements of discharge are made 
with current meters using methods adapted by the Geological Survey as a result 
of experience accumulated since 1880. These methods are described in standard 
textbooks, in Water-Supply Paper 2175, and in U.S. Geological Survey Tech­
niques of Water-Resources Investigations, Book 3, Chapter A6. 
In computing discharge records, results of individual measurements are 
plotted against the corresponding stages, and stage-discharge relation curves 
are then constructed. From these curves, rating tables indicating the approx­
imate discharge for any stage within the range of the measurements are pre­
pared. If it is necessary to define extremes of discharge outside the range 
of the current-meter measurements, the curves are extended using: (1) loga­
rithmic plotting; (2) velocity-area studies; (3) results of indirect measure­
ments of peak discharge, such as slope-area or contracted-opening measure­
ments, and computations of flow-over-dams or weirs; or (4) step-backwater 
techniques. 
Daily mean discharges are computed by applying the daily mean stages 
(gage heights) to the stage-discharge curves or tables. If the stage-
discharge relation is subject to change because of frequent or continual 
change in the physical features that form the control, the daily mean dis­
charge is determined by the shifting-control method, in which correction 
factors based on the individual discharge measurements and notes of the 
personnel making the measurements are applied to the gage heights before the 
discharges are determined from the curves or tables. This shifting-control 
method also is used if the stage-discharge relation is changed temporarily 
because of aquatic growth or debris on the control. 
At some stream-gaging stations the stage-discharge relation is affected 
by the backwater from reservoirs, tributary streams, or other sources. This 
necessitates the use of the slope method in which the slope or fall in a reach 
of the stream is a factor in computing discharge. The slope or fall is 
obtained by means of an auxiliary gage set at some distance from the base 
gage. At some stations the stage-discharge relation is affected by changing 
stage; at these stations the rate of change in stage is used as a factor in 
computing discharge. 
In computing records of lake or reservoir contents, it is necessary to 
have available from surveys, curves or tables defining the relationship of 
stage and contents. The application of stage to the stage-content curves or 
tables gives the contents from which daily, monthly or yearly changes then are 
determined. If the stage-content relationship changes because of deposition 
of sediment in a lake or reservoir, periodic surveys may be necessary to 
redefine it. Even when this is done, as time between the last survey 
increases, the contents computed may increase in error. Discharges over lake 
or reservoir spillways are computed from stage-discharge relationships much as 
other stream discharges are computed. 
20 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
For some gaging stations there are periods when no gage-height record is 
obtained, or the recorded gage height is so faulty that it cannot be used to 
compute daily discharge or contents. This happens when the recorder stops or 
otherwise fails to operate properly, intakes are plugged, the float is loose 
in the well, or for various other reasons. For such periods, the daily 
discharges are estimated from the recorded range in stage, previous or follow­
ing record, discharge measurements, weather records, and comparison with other 
station records from the same or nearby basins. Likewise, daily contents may 
be estimated from operator's logs, previous or following record, inflow-
outflow studies, and other information. Information explaining how estimated 
daily-discharge values are identified in station records is included in the 
next two sections, "Data Presentation" (REMARKS paragraph) and "Identifying 
Estimated Daily Discharge." 
Data Presentation 
The records published for each gaging station consist of two parts, the 
manuscript or station description and the data table for the current water 
year. The manuscript provides, under various headings, descriptive informa­
tion, such as station location; period of record; average discharge; histori­
cal extremes; record accuracy; and other remarks pertinent to station opera­
tion and regulation. The following information, as appropriate, is provided 
with each continuous record of discharge or lake content. Comments to follow 
clarify information presented under the various headings of the station 
description. 
LOCATION.--Information on locations is obtained from the most accurate 
maps available. The location of the gage with respect to the cultural and 
physical features in the vicinity and with respect to the reference place 
mentioned in the station name is given. 
DRAINAGE AREA.--Drainage areas are measured using the most accurate maps 
available. Drainage areas are updated as better maps become available. 
PERIOD OF RECORD.--This indicates the period for which there are pub­
lished records for the station or for an equivalent station. An equivalent 
station is one that was in operation at a time that the present station was 
not, and whose location was such that records from it can reasonable be 
considered equivalent with records from the present station. 
REVISED RECORDS.--Published records, because of new information, occa­
sionally are found to be incorrect, and revisions are printed in later 
reports. Listed under this heading are all the reports in which revisions 
have been published for the station and the water years to which the revisions 
apply. If a revision did not include daily, monthly, or annual figures of 
discharge, that fact is noted after the year dates as follows: "(M)" means 
that only the instantaneous maximum discharge was revised; "(m)" that only the 
instantaneous minimum was revised; and "(P)" that only peak discharges were 
revised. If the drainage area has been revised, the report in which the most 
recently revised figure was first published is given. 
21 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
GAGE.--The type of gage in current use, the datum of the current gage, 
and a condensed history of the types, locations, and datums of previous gages 
are given under this heading. 
REMARKS.--All periods of estimated daily-discharge record will either be 
identified by date in this paragraph of the station description for water-
discharge stations or flagged in the daily-discharge table. (See next sec­
tion, "Identifying Estimated Daily Discharge.") If a remarks statement is 
used to identify estimated record, the paragraph will begin with this informa­
tion presented as the first entry. The paragraph is also used to present 
information relative to the accuracy of the records, to special methods of 
computations, to conditions that affect natural flow at the station and, 
possibly, to other pertinent items. For reservoir stations, information is 
given on the dam forming the reservoir, the capacity, outlet works and spill­
way, and purpose and use of the reservoir. 
COOPERATION.--Records provided by a cooperating organization or obtained 
for the Geological Survey by a cooperating organization are identified here. 
AVERAGE DISCHARGE.--The discharge value given is the arithmetic mean of 
the water-year mean discharges. It is computed only for stations having at 
least 5 water years of complete record, and only water years of complete 
record are included in the computation. It is not computed for stations where 
diversions, storage, or other water-use practices cause the value to be 
meaningless. If water developments significantly altering flow at a station 
are put into use after the station has been in operation for a period of 
years, a new average is computed as soon as 5 water years of record have 
accumulated following the development. The median of yearly mean discharges 
also is given under this heading for stations having 10 or more water years of 
record, if the median differs from the average given by more than 10 percent. 
EXTREMES FOR PERIOD OF RECORD.--Extremes may include maximum and minimum 
stages and maximum and minimum discharges or content. Unless otherwise 
qualified, the maximum discharge or content is the instantaneous maximum 
corresponding to the highest stage that occurred. The highest stage may have 
been obtained from a graphic or digital recorder, a crest-stage gage, or by 
direct observation of a nonrecording gage. If the maximum stage did not occur 
on the same day as the maximum discharge or content, it is given separately. 
Similarly, the minimum is the instantaneous minimum discharge, unless other­
wise qualified, and was determined and is reported in the same manner as the 
maximum. 
EXTREMES OUTSIDE PERIOD OF RECORD.--Included here is information concern­
ing major floods or unusually low flows that occurred outside the stated 
period of record. The information may or may not have been obtained by the 
U.S. Geological Survey. 
22 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
EXTREMES FOR CURRENT YEAR.--Extremes given here are similar to those for 
the period of record, except the peak discharge listing may include secondary 
peaks. For stations meeting certain criteria, all peak discharges and stages 
occurring during the water year and greater than a selected base discharge are 
presented under this heading. The peaks greater than the base discharge, 
excluding the highest one, are referred to as secondary peaks. Peak dis­
charges are not published for canals, ditches, drains, or streams for which 
the peaks are subject to substantial control by man. The time of occurrence 
for peaks is expressed in 24-hour local standard time. For example, 12:30 
a.m. is 0030, and 1:30 p.m. is 1330. The minimum for the current water year 
appears below the table of peak data. 
REVISIONS.--If a critical error in published records is discovered, a 
revision is included in the first report published following discovery of the 
error. 
Although rare, occasionally the records of a discontinued gaging station 
may need revision. Because, for these stations, there would be no current or, 
possibly, future station manuscript published to document the revision in a 
"Revised Records" entry, users of data for these stations who obtained the 
record from previously published data reports may wish to contact the District 
office to determine if the published records were ever revised after the 
station was discontinued. Of course, if the data were obtained by computer 
retrieval, the data would be current and there would be no need to check 
because any published revision of data is always accompanied by revision of 
the corresponding data in computer storage. 
Manuscript information for lake or reservoir stations differs from that 
for stream stations in the nature of the "Remarks" and in the inclusion of a 
skeleton stage-capacity table when daily contents are given. 
The daily table for stream-gaging stations gives mean discharge for each 
day and is followed by monthly and yearly summaries. In the monthly summary 
below the daily table, the line headed "TOTAL" gives the sum of the daily 
figures. The line headed "MEAN" gives the average flow in cubic feet per 
second during the month. The lines headed "MAX" and "MIN" give the maximum 
and minimum daily discharges, respectively, for the month. Discharge for the 
month also is usually expressed in cubic feet per second per square mile (line 
headed "CFSM"), or in inches (line headed "IN."), or in acre-feet (line headed 
"AC-FT"). Figures for cubic feet per second per square mile and runoff in 
inches are omitted if there is extensive regulations or diversion or if the 
drainage area includes large noncontributing areas. In the yearly summary 
below the monthly summary, the figures shown are the appropriate discharges 
for the calendar and water years. 
Data collected at partial-record stations follow the information for 
continuous-record sites. Data for partial-record discharge stations are 
presented in two tables. The first is a table of annual maximum stage and 
discharge at crest-stage stations, and the second is a table of discharge 
measurements at low-flow partial-record stations. 
23 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Identifying Estimated Daily Discharge 
Estimated daily-discharge values published in the water-discharge tables 
of annual State data reports are identified either by flagging individual 
daily values with the letter symbol "e" and printing a table footnote, "e 
Estimated," or by listing the dates of the estimated record in the REMARKS 
paragraph of the station description. 
Accuracy of the Records 
The accuracy of streamflow records depends primarily on: (1) The stabil­
ity of the stage-discharge relation or, if the control is unstable, the 
frequency of discharge measurements; and (2) the accuracy of measurements of 
stage, measurements of discharge, and interpretation of records. 
The accuracy attributed to the records is indicated under "REMARKS." 
"Excellent" means that about 95 percent of the daily discharges are within 5 
percent of the true; "good," within 10 percent; and "fair," within 15 percent. 
Records that do not meet the criteria mentioned, are rated "poor." Different 
accuracies may be attributed to different parts of a given record. 
Daily mean discharges in this report are given to the nearest hundredth 
of a cubic foot per second for values less than 1 ft3/s; to the nearest tenth 
between 1.0 and 10 ft3/s; to whole numbers between 10 and 1,000 ft3/s; and to 
3 significant figures for more than 1,000 ft3/s. The number of significant 
figures used is based solely on the magnitude of the discharge value. The 
same rounding rules apply to discharges listed for partial-record stations and 
miscellaneous sites. 
Information used in the preparation of the records in this publication, 
such as discharge-measurement notes, gage-height records, temperature measure­
ments, and rating tables are on file in the Caribbean District office. Also, 
most of the daily mean discharges are in computer-readable form and have been 
analyzed statistically. Information on the availability of the unpublished 
information or on the results of statistical analyses of the published records 
may be obtained from the District office. 
Records of Surface-Water Quality 
Records of surface-water quality ordinarily are obtained at or near 
stream-gaging stations because interpretation of records of surface-water 
quality nearly always requires corresponding discharge data. Records of 
surface-water quality in this report may involve a variety of types of data 
and measurement frequencies. 
24 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Classification of Records 
Water-quality data for surface-water sites are grouped into one of three 
classifications. A continuing-record station is a site where data are collec­
ted on a regularly scheduled basis. Frequency may be once or more times 
daily, weekly, monthly, or quarterly. A partial-record station is a site 
where limited water-quality data are collected systematically over a period of 
years. Frequency of sampling is usually less than quarterly. A miscellaneous 
sampling site is a location other than a continuing or partial-record station, 
where random samples are collected to give better areal coverage to define 
water-quality conditions in the river basin. 
A careful distinction needs to be made between "continuing records" as 
used in this report and "continuous recordings," which refers to a continuous 
graph or a series of discrete values punched at short intervals on a paper 
tape. Some records of water quality, such as temperature and specific conduct­
ance, may be obtained through continuous recordings; however, because of 
costs, most data are obtained only monthly or less frequently. Locations of 
stations for which records on the quality of surface water appear in this 
report are shown in figure 6. 
Arrangement of Records 
Water-quality records collected at a surface-water daily record station 
are published immediately following that record, regardless of the frequency 
of sample collection. Station number and name are the same for both records. 
Where a surface-water daily record station is not available or where the water 
quality differs significantly from that at the nearby surface-water station, 
the continuing water-quality record is published with its own station number 
and name in the regular downstream-order sequence. Water-quality data for 
partial-record stations and for miscellaneous sampling sites appear in sepa­
rate tables following the table of discharge measurement at miscellaneous 
sites. 
On-site Measurements and Sample Collection 
In obtaining water-quality data, a major concern needs to be assuring 
that the data obtained represent the in situ quality of the water. To assure 
this, certain measurements, such as water temperature, pH, and dissolved 
oxygen, need to be made onsite when the samples are taken. To assure that 
measurements made in the laboratory also represent the in situ water, care­
fully prescribed procedures need to be followed in collecting the samples, in 
treating the samples to prevent changes in quality pending analysis, and in 
shipping the samples to the laboratory. Procedures for onsite measurements 
and for collecting, treating, and shipping samples are given in publications 
on "Techniques of Water-Resources Investigations," Book 1, Chap. D2; Book 3, 
Chap. C2; Book 5, Chap. Al, A3, and A4. Detailed information on collecting, 
treating, and shipping samples may be obtained from the Geological Survey 
District office. 
25 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
One sample can define adequately the water quality at a given time if the 
mixture of solutes throughout the stream cross section is homogeneous. 
However, the concentration of solutes at different locations in the cross 
section may vary widely with different rates of water discharge, depending on 
the source of material and the turbulence and mixing of the stream. Some 
streams must be sampled through several vertical sections to obtain a repre­
sentative sample needed for an accurate mean concentration and for use in 
calculating load. All samples obtained for the National Stream Quality 
Accounting 1;etwork (see definitions) are obtained from at least several 
verticals. Whether samples are obtained from the centroid of flow or from 
several verticals, depends on flow conditions and other factors which must be 
evaluated by the collector. 
Chemical-quality data published in this report are considered to be the 
most representative values available for the stations listed. The values 
reported represent water-quality conditions at the time of sampling as much as 
possible, consistent with available sampling techniques and methods of analy­
sis. In the rare case where an apparent inconsistency exists between a 
reported pH value and the relative abundance of carbon dioxide species (carbon­
ate and bicarbonate), the inconsistency is the result of a slight uptake of 
carbon dioxide from the air by the sample between measurement of pH in the 
field and determination of carbonate and bicarbonate in the laboratory. 
For chemical-quality stations equipped with digital monitors, the records 
consist of daily maximum, minimum, and mean values for each constituent 
measured and are based upon hourly punches beginning at 0100 hours and ending 
at 2400 hours for the day of record. More detailed records, when available, 
(hourly values) may be obtained from the U.S.G.S. District office whose 
address is given on the back of the title page of this report. 
Water Temperature 
Water temperatures are measured at most of the water-quality stations. 
In addition, water temperatures are taken at time of discharge measurements 
for water-discharge stations. For stations where water temperatures are taken 
manually once or twice daily, the water temperatures are taken at about the 
same time each day. Large streams have a small diurnal temperature change; 
shallow streams may have a daily range of several degrees and may follow 
closely the changes in air temperature. Some streams may be affected by 
waste-heat discharges. 
At stations where recording instruments are used, either mean tempera­
tures or maximum and minimum temperatures for each day are published. Water 
temperatures measured at the time of water-discharge measurements are on file 
in the District office. 
26 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Sediment 
Suspended-sediment concentrations are determined from samples collected 
by using depth-integrating samplers. Samples usually are obtained at several 
verticals in the cross section, or a single sample may be obtained at a fixed 
point and a coefficient applied to determine the mean concentration in the 
cross sections. 
During periods of rapidly changing flow or rapidly changing concentra­
tion, samples may have been collected more frequently (twice daily or, in some 
instances, hourly). The published sediment discharges for days of rapidly 
changing flow or concentration were computed by the subdivided-day method 
(time-discharge weighted average). Therefore, for those days when the pub­
lished sediment discharge value differs from the value computed as the product 
of discharge times mean concentration times 0.0027, the reader can assume that 
the sediment discharge for that day was computed by the subdivided-day method. 
For periods when no samples were collected, daily discharges of suspended 
sediment were estimated on the basis of water discharge, sediment concentra­
tions observed immediately before and after the periods, and suspended-
sediment loads for other periods of similar discharge. 
At other stations, suspended-sediment samples were collected periodically 
at many verticals in the stream cross section. Although data collected 
periodically may represent conditions only at the time of observations, such 
data are useful in establishing seasonal relations between quality and stream-
flow and in predicting long-term sediment-discharge characteristics of the 
stream. 
In addition to the records of suspended-sediment discharge, records of 
the periodic measurements of the particle-size distribution of the suspended 
sediment and bed material are included for some stations. 
Laboratory Measurements 
Sediment samples, samples for biochemical-oxygen demand (BOD), samples 
for indicator bacteria, and daily samples for specific conductance are ana­
lyzed locally. All other samples are analyzed in the Geological Survey 
laboratories in Denver, Co. or Ocala, Fla. Methods used in analyzing sediment 
samples and computing sediment records are given in TWRI, Book 5, Chap. Cl. 
Methods used by the Geological Survey laboratories are given in TWRI, Book 1, 
Chap. D2; Book 3, Chap. C2; Book 5, Chap. Al, A3, and A4. 
Data Presentation 
For continuing-record stations, information pertinent to the history of 
station operation is provided in descriptive headings preceding the tabular 
data. These descriptive headings give details regarding location, drainage 
area, period of record, type of data available, instrumentation, general 
remarks, cooperation, and extremes for parameters currently measured daily. 
Tables of chemical, physical, biological, radiochemical data, and so forth, 
obtained at a frequency less than daily are presented first, and tables of 
"daily values" of specific conductance, pH, water temperature, dissolved 
oxygen, and suspended sediment then follow in sequence, when these parameters 
are studied. 
27 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
In the descriptive headings, if the location is identical to that of the 
discharge gaging station, neither the LOCATION nor the DRAINAGE AREA state­
ments are repeated. The following information, as appropriate, is provided 
with each continuous-record station. Comments that follow clarify information 
presented under the various headings of the station description. 
LOCATION.--See Data Presentation under "Records of Stage and Water 
Discharge;" same comments apply. 
DRAINAGE AREA.--See Data Presentation under "Records of Stage and Water 
Discharge;" same comments apply. 
PERIOD OF RECORD.--This indicates the periods for which there are pub­
lished water-quality records for the station. The periods are shown separate­
ly for records of parameters measured daily or continuously and those measured 
less than daily. For those measured daily or continuously, periods of record 
are given for the parameters individually. 
INSTRUMENTATION.--Information on instrumentation is given only if a 
water-quality monitor temperature record, sediment pumping sampler, or other 
sampling device is in operation at a station. 
REMARKS.--Remarks provide added information pertinent to the collection, 
analysis, or computation of the records. 
COOPERATION.--Records provided by a cooperating organization or obtained 
for the Geological Survey by a cooperating organization are identified here. 
EXTREMES.--Maximums and minimums are given only for parameters measured 
daily or more frequently. None are given for parameters measured weekly or 
less frequently, because the true maximums or minimums may not have been 
sampled. Extremes, when given, are provided for both the period of record 
and for the current water year. 
REVISIONS.--If errors in published water-quality records are discovered 
after publication, appropriate updates are made to the Water-Quality File in 
the U.S. Geological Survey's computerized data system, WATSTORE, and subse­
quently by monthly transfer of update transactions to the U.S. Environmental 
Protection Agency's STORET system. Because the usual volume of updates makes 
it impractical to document individual changes in the State data-report series 
or elsewhere, potential users of U.S. Geological Survey water-quality data are 
encouraged to obtain all required data from the appropriate computer file to 
insure the most recent updates. 
The surface-water-quality records for partial-record stations and miscel­
laneous sampling sites are published in separate tables following the table of 
discharge measurements at miscellaneous sites. No descriptive statements are 
given for these records. Each station is published with its own station 
number and name in the regular downstream-order sequence. 
 
 
28 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Remark Codes 
The following remark codes may appear with the water-quality data in this 
report: 
PRINTED OUTPUT 
REMARK 
E 
Estimated value 
Actual value is known to be greater than the 
value shown 
Actual value is known to be less than the value 
shown 
K 
Results based on colony count outside the 
acceptance range (non-ideal colony count) 
Biological organism count less than 0.5 percent 
(organism may be observed rather than 
counted) 
D 
Biological organism count equal to or greater 
than 15 percent (dominant) 
Biological organism estimated as dominant 
Records of Ground-Water Levels 
Only ground-water level data from a basic network of observation wells 
are published herein. This basic network contains observation wells so 
located that the most significant data are obtained from the fewest wells in 
the most important aquifers. 
Data Collection and Computation 
Measurements of water levels are made in many types of wells under 
varying conditions, but the methods of measurement are standardized to the 
extent possible. The equipment and measuring techniques used at each observa­
tion well ensure that measurements at each well are of consistent accuracy and 
reliability. 
Each well is identified by means of (1) a 15-digit number that is based 
on latitude and longitude and (2) a local number that is provided for local 
needs. See figure 10. 
 
29 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Water-level records are obtained from direct measurements with a steel 
tape or from the graph or punched tape of a water-stage recorder. The water-
level measurements in this report are given in feet with reference to land-
surface datum (lsd). Land-surface datum is a datum plane that is approxi­
mately at land surface at each well. If known, the elevation of the land-
surface datum is given in the well description. The height of the measuring 
point (MP) above or below land-surface datum is given in each well descrip­
tion. Water levels in wells equipped with recording gages are reported for 
every day ad,..1 a., an instantaneous observation at noon. 
Water levels are reported to as many significant figures as can be 
justified by the local conditions. For example, in a measurement of a depth 
to water of several hundred feet, the error of determining the absolute value 
of the total depth to water may be a few tenths of a foot, whereas the error 
in determining the net change of water level between successive measurements 
may be only a hundredth of a few hundredths of a foot. For lesser depths to 
water, the accuracy is greater. Accordingly, most measurements reported to a 
hundredth of a. foot, but some are given to a tenth of a foot or a larger unit. 
Data Presentation 
Each well record consists of two parts, the station description and the 
data table of water levels observed during the water year. The description of 
the well is presented first through use of descriptive headings preceding the 
tabular data. The comments to follow clarify information presented under the 
various headings. 
LOCATION.--This paragraph follows the well-identification number and 
reports the latitude and longitude (given in degrees, minutes, and seconds); a 
landline location designation; the hydrologic-unit number; the distance and 
direction from a geographic point of reference; and the owner's name. 
AQUIFER.--This entry designates by name (if a name exists) and geologic 
age the aquifer(s) open to the well. 
WELL CHARACTERISTICS.--This entry describes the well in terms of depth, 
diameter, casing depth and/or screened interval, method of construction, use, 
and additional information such as casing breaks, collapsed screen, and other 
changes since construction. 
DATUM.--This entry describes both the measuring point and the land-
surface elevation at the well. The measuring point is described 
physically (such as top of collar, notch in top of casing, plug in 
pump base and so on), and in relation to land surface (such as 1.3 
ft above land-surface datum). 
The elevation of the land-surface 
datum is described in feet above mean sea level datum, if available. 
It is reported with precision depending on the method of determina­
tion. 
 
30 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
REMARKS.--This entry describes factors that may influence the water level 
in a well or the measurement of the water level. It should identify 
wells that also are water-quality observation wells, and may be used 
to acknowledge the assistance of local (non-survey) observers. 
PERIOD OF RECORD.--This entry indicates the period for which there are 
published records for the well. It reports the month and year of 
the start of publication of water-level records by the U.S. Geologi­
cal Survey and the words "to current year" if the records are to be 
continued into the following year. 
Periods for which water-level 
records are available, but are not published by the Geological 
Survey, may be noted. 
EXTREMES FOR PERIOD OF RECORD.--This entry contains the highest and low­
est water levels of the period of published record, with respect to 
land-surface datum, and the dates of their occurrence. 
A table of water levels follows the station description for each well. 
Water levels are reported in feet below land-surface datum and all taped 
measurements of water level are listed. For wells equipped with recorders, 
daily values tables are published for the instanteous water-level observation 
at noon. The highest and lowest water levels of the water year are shown on a 
line below the table. Because all values are not published for wells with 
recorders, the extremes may be values that are not listed in the table. 
Missing records are indicated by dashes in place of the water level. 
Records of Ground-Water Quality 
Records of ground-water quality in this type of report differ from other 
types of records in that for most sampling sites they consist of only one set 
of measurements for the water year. The quality of ground water ordinarily 
changes only slowly; therefore, for most general purposes one annual sampling, 
or only a few samples taken at infrequent intervals during the year, is 
sufficient. Frequent measurement of the same constituents is not necessary 
unless one is concerned with a particular problem, such as monitoring for 
trends in nitrate concentration. In the special cases where the quality of 
ground water may change more rapidly, more frequent measurements are made to 
identify the nature of the changes. 
Data Collection and Computation 
The records of ground-water quality in this report were obtained mostly 
as a part of special studies in specific areas. Consequently, a number of 
chemical analyses are presented for some counties but none are presented for 
others. As a result, the records for this year, by themselves, do not provide 
a balanced view of ground-water quality Statewide. Such a view can be 
attained only by considering records for this year in context with similar 
records obtained for these and other counties in earlier years. 
31 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Most methods for collecting and analyzing water samples are described in 
the "U.S. Geological Survey Techniques of Water-Resources Investigations" 
manuals listed on a following page. The values reported in this type of 
report represent water-quality conditions at the time of sampling as much as 
possible, consistent with available sampling techniques and methods of analy­
sis. All samples are obtained by trained personnel. The wells sampled are 
pumped long enough to assure that the water collected comes directly from the 
aquifer and has not stood for a long time in the well casing where it would 
have been exposed to the atmosphere and to the material, possibly metal, 
comprising the casings. 
Data Presentation 
The records of ground-water quality, when available, are published in a 
section titled QUALITY OF GROUND WATER immediately following the ground-water 
level records, Data for quality of ground water are listed alphabetically by 
County, and are identified by well number. The prime identification number 
for wells sampled is the 15-digit number derived from the latitude-longitude 
locations. No descriptive statements are given for ground-water-quality 
records; however, the well number, depth of well, date of sampling, and other 
pertinent data are given in the table containing the chemical analyses of the 
ground water. The REMARK codes listed for surface-water-quality records are 
also applicable to ground-water-quality records. 
ACCESS TO WATSTORE DATA 
The National WATer Data STOrage and REtrieval System (WATSTORE) was 
established for handling water data collected through the activities of the 
U.S. Geological Survey and to provide for more effective and efficient means 
of releasing the data to the public. The system is operated and maintained on 
the central computer facilities of the Survey at its National Center in 
Reston, Virginia. 
WATSTORE can provide a variety of useful products ranging from simple 
data tables to complex statistical analyses. A minimal fee, plus the actual 
computer cost incurred in producing a desired product, is charged to the 
requester. Information about the availability of specific types of data, the 
acquisition of data or products, and user charges can be obtained locally from 
each of the Water Resources Division's District offices (see address given on 
the back of the title page). 
General inquiries about WATSTORE may be directed to: 
Chief Hydrologist 
U.S. Geological Survey 
437 National Center 
Reston, Virginia 22092 
 
32 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
DEFINITION OF TERMS 
Terms related to streamflow, water-quality, and other hydrologic data as 
used in this report, are defined below. See also the table for converting 
inch- pound units to the International System of units (SI) on the inside of 
the back cover. 
Acre-foot (AC-FT, acre-ft) is the quantity of water required to cover 1 
acre to a depth of 1 foot and is equal to about 326,000 gallons or 1,233 cubic 
meters. 
Adenosine triphosphate (ATP) is an organic, phosphate-rich, compound 
important in the transfer of energy in organisms. Its central role in living 
cells makes it an excellent indicator of the presence of living material in 
water. A measure of ATP therefore provides a sensitive and rapid estimate of 
biomass. ATP is reported in micrograms per liter of the original water 
sample. 
Algae growth potential (AGP) is the maximum algal dry weight biomass that 
can be produced in a natural water sample under standardized laboratory 
conditions. The growth potential is the algal biomass present a stationary 
phase and is expressed as milligrams dry weight of algae produced per liter of 
sample. 
Aquifer is a geologic formation, group of formations, or part of a 
formation that contains sufficient saturated permeable material to yield 
significant quantities of water to wells and springs. 
Artesian means confined and is used to describe a well in which the water 
level stands above the top of the aquifer, tapped by the well. A flowing 
artesian well is one in which the water level is above the land surface. 
Bacteria are microscopic unicellular organisms, typically spherical, 
rodlike, or spiral and threadlike in shape, often clumped into colonies. Some 
bacteria cause disease, while others perform an essential role in nature in 
the recycling of materials; for example, by decomposing organic matter into a 
form available for reuse by plants. 
Total coliform bacteria are a particular group of bacteria that are 
used as indicators of possible sewage pollution. They are characterized 
as aerobic or facultative anaerobic, gram-negative, nonspore-forming, 
rod-shaped bacteria which ferment lactose with gas formation within 48 
hours at 35°C. 
In the laboratory these bacteria are defined as all the 
organisms which produce colonies with a golden-green metallic sheen 
within 24 hours when incubated at 35°C + 1.0°C on M-Endo medium (nutri­
ent medium for bacterial growth). Their concentrations are expressed as 
number of colonies per 100 mL of sample. 
 
33 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Fecal coliform bacteria are bacteria that are present in the 
intestines or feces of warm-blooded animals. They are often used as in­
dicators of the sanitary quality of the water. In the laboratory they 
are defined as all organisms which produce blue colonies within 24 hours 
when incubated at 44.5°C + 0.2°C on M-FC medium (nutrient medium for 
bacterial growth). Their concentrations are expressed as number of colo­
nies per 100 mL of sample. 
Feal streptococcal bacteria are bacteria found also in intestines 
of warm-blooded animals. Their presence in water is considered to verify 
fecal pollution. They are characterized as Gram-positive, cocci bacteria 
which are capable of growth in brain-heart infusion broth. In the lab­
oratory they are defined as all the organisms which produce red or pink 
colonies within 48 hours at 35°C + 1.0°C on KF-streptococcus medium 
(nutrient medium for bacterial growth). 
Their concentrations are ex-
pressed as number of colonies per 100 mL of sample. 
Bed material is the unconsolidated material of which a streambed, lake, 
pond, reservoir, or estuary bottom is composed. 
Biochemical oxygen demand (BOD) is a measure of the quantity of dissolved 
oxygen, in milligrams per liter, necessary for the decomposition of organic 
matter by microorganisms, such as bacteria. 
Biomass is the amount of living matter present at any given time, ex­
pressed as the mass per unit area or volume of habitat. 
Ash mass is the mass or amount of residue present after the residue 
from the dry mass determination has been ashed in a muffle furnace at a 
temperature of 500°C for 1 hour. The ash mass values of zooplankton and 
phytoplankton are expressed in grams per cubic meter (g/m3), and periphy­
ton and benthic organisms in grams per square meter (g/m2). 
Dry mass refers to the mass of residue present after drying in an 
oven at 105°C for zooplankton and periphyton, until the mass remains 
unchanged. This mass represents the total organic matter, ash and 
sediment, in the sample. Dry-mass values are expressed in the same units 
as ash mass. 
Organic mass or volatile mass of the living substance is the differ­
ence between the dry mass and the ash mass and represents the actual 
matter. The organic mass is expressed in the same units as for ash and 
dry mass. 
Wet mass is the mass of living matter plus contained water. 
Bottom material: See Bed material. 
Cells/volume refers to the number of cells of any organism which is 
counted by using a microscope and grid or counting cell. Many planktonic 
organisms are multicelled and are counted according to the number 'of contained 
cells per sample, usually milliliters (mL) or liters (L). 
34 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Chemical oxygen demand (COD) is a measure of the chemically oxidizable 
material in the water, and furnishes an approximation of the amount of organic 
and reducing material present. The determined value may correlate with 
natural water color or with carbonaceous organic pollution from sewage or 
industrial wastes. 
Clorophyll refers to the green pigments of plants. Chlorophyll a and b 
are the two most common green pigments in plants. 
Color unit is produced by one milligram per liter of platinum in the form 
of the chloroplatinate ion. Color is expressed in units of the platinum-
cobalt scale. 
Contents is the volume of water in a reservoir or lake. Unless otherwise 
indicated, volume is computed on the basis of a level pool and does not 
include bank storage. 
Control designates a feature downstream from the gage that determines the 
stage-discharge relation at the gage. This feature may be a natural constric­
tion of the channel, an artificial structure, or a uniform cross section over 
a long reach of the channel. 
Control structure as used in this report is a structure on a stream or 
canal that is used to regulate the flow or stage of the stream or to prevent 
the intrusion of salt water. 
Crest-stage station is a special form of partial-record station that 
records the highest stage of the stream that occurred between periodic visits 
to the station. A stage-discharge relation for each gage may be developed 
from discharge measurements made by indirect methods or by current meter. 
Cubic foot per second (cfs) is the rate of discharge representing a 
volume of 1 cubic foot passing a given point during 1 second and is equivalent 
to 7.48 gallons per second or 448.8 gallons per minute or 0.02832 cubic meters 
per second. 
Cubic foot per second-day (cfs-day) is the volume of water represented by 
a flow of 1 cubic foot per second for 24 hours. It is equivalent to 86,400 
cubic feet, approximately 1.9835 acre-feet, about 646,000 gallons, or 2,445 
cubic meters. 
Cubic feet per second per square mile (CFSM) is the average number of 
cubic feet of water flowing per second from each square mile of area drained, 
assuming that the runoff is distributed uniformly in time and area. 
Discharge is the volume of water (or more broadly, volume of fluid plus 
suspended sediment), that passes a given point within a given period of time. 
Instantaneous discharge is the discharge at a particular instant of 
time. 
Mean discharge (MEAN) is the arithmetic mean of individual daily 
mean discharges during a specific period. 
 
 
35 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Dissolved refers to that material in a representative water sample which 
passes through a 0.45 um membrane filter. This is a convenient operational 
definition used by Federal agencies that collect water data. Determinations 
of "dissolved" constituents are made on subsamples of the filtrate. 
Dissolved-solids concentration of water is determined either analytically 
by the "residue-on-evaporation" method, or mathematically by totaling the 
concentrations of individual constituents reported in a comprehensive chemical 
analysis. During the analytical determination of dissolved solids, the 
bicarbonate (generally a major dissolved component of water ) is converted to 
carbonate. Therefore, in the mathematical calculations of dissolved-solids 
concentration, the bicarbonate value, in milligrams per liter, is multiplied 
by 0.492 to reflect the change. 
Diversity index is a numerical expression of evenness of distribution of 
aquatic organisms. The formula for diversity index is: 
s n. 
n.
1 
1 
d = - E n--- log2 1-1-
1=1 
Where ni is the number of individuals per taxon, n is the total number of 
individuals, and s is the total number of taxa in the sample of the community. 
Diversity index values range from zero, when all the organisms in the sample 
are the same, to some positive number, when some or all of the organisms in 
the sample are different. 
Drainage area of a stream at a specified location is that area, measured 
in a horizontal plane, enclosed by a topographic divide from which direct 
surface runoff from precipitation normally drains by gravity into the stream 
above the specified point. Figures of drainage area given herein include all 
closed basins, or noncontribution areas, within the area unless otherwise 
noted. 
Drainage basin is a part of the surface of the earth that is occupied by 
a drainage system, which consists of a surface stream or a body of impounded 
surface water together with all tributary surface streams and bodies of 
impounded surface water. 
Gage height (G.H.) is the water-surface elevation referred to some 
arbitrary gage datum. Gage height is often used interchangeably with the more 
general term "stage," although gage height is more appropriate when used with 
a reading on a gage. 
Gaging station is a particular site on a stream, canal, lake, or 
reservoir where systematic observations of hydrologic data are obtained. 
Ground-water station is a well at which observations of ground-water 
level are made, either continuously by recorder, or periodically by hand. In 
addition, various chemical or physical parameters may be obtained, usually on 
a periodic basis. 
36 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Hardness of water is a physical-chemical characteristic that is commonly 
recognized by the increased quantity of soap required to produce lather. It 
is attributable to the presence of alkaline earths (principally calcium and 
magnesium) and is expressed as equivalent calcium carbonate (CaCO3). 
Hydrologic Bench-Mark Network is a network in small drainage basins 
around the country whose purpose is to provide consistent data on the hydrol­
ogy, including water quality, and related factors in representative un­
developed watersheds nationwide, and to provide analyses on a continuing basis 
to compare and contrast conditions observed in basins more obviously affected 
by the activities of man. 
Hydrologic unit is a geographic area representing part or all of a 
surface drainage basin or distinct hydrologic feature as delineated by the 
Office of Water Data Coordination on the State Hydrologic Unit Maps; each 
hydrologic unit is identified by an eight-digit number. 
Land-surface datum (lsd) is a datum plane that is approximately at land 
surface at each ground-water observation well. 
Measuring point (MP) is an arbitrary permanent reference point from which 
the distance to the water surface in a well is measured to obtain the water 
level. 
Metamorphic stage refers to the stage of development that an organism 
exhibits during its transformation from an immature form to an adult form. 
This developmental process exists for most insects, and the degree of differ­
ence from the immature stage to the adult form varies from relatively slight 
to pronounced, with many intermediates. Examples of metamorphic stages of 
insects are egg-larva-adult or egg-nymph-adult. 
Methylene blue active substances (MBAS) are apparent detergents. The 
determination depends on the formation of a blue color when methylene blue dye 
reacts with synthetic anionic detergent compounds. 
Micrograms per gram (ug/g) is a unit expressing the concentration of a 
chemical element as the mass (micrograms) of the element per unit mass (gram) 
of material analyzed. 
Micrograms per liter (UG/L, ug/L) is a unit expressing the concentration 
of chemical constituents in solution as mass (micrograms) of solute per unit 
volume (liter) of water. One thousand micrograms per liter is equivalent to 
one milligram per liter. 
Milligrams per liter (MG/L, mg/L) is a unit for expressing the concentra­
tion of chemical constituents in solution. Milligrams per liter represent the 
mass of solute per unit volume (liter) of water. Concentration of suspended 
sediment also is expressed in mg/L, and is based on the mass of sediment per 
liter of water-sediment mixture. Conversion of chemical concentrations in 
Mg/L to milliequivalents per liter can be done by using the factors in table 
5. 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
37 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
TABLE 5.--Factors for conversion of chemical constituents in milligrams 
per liter to milliequivalents per liter. 
Ion' 
Multiply by 
Ion 
Multiply by 
Aluminum (A1+3)* 
0.11119 
Iodide (I-1) 
0.00788 
Ammonia as NH4+1 
.05544 
Iron (Fe+3) 
.05372 
Barium (Ba+2) 
.01456 
Lead (Pb+2) 
.00965 
Bicarbonate (HCO3-1).... 
.01639 
Lithium (Li+1) 
.14411 
Bromide (Br-1) 
.01251 
Magnesium (Mg+2).... 
.08226 
Calcium (Ca+2) 
.04990 
Manganese (Mn+2)*... 
.03640 
Carbonate (CO3-2) 
.03333 
Nickel (Ni+2) 
.03406 
Chloride (C1-1) 
.02821 
Nitrate (NO3-1) 
.01613 
Chromium (Cr+6)* 
.11539 
Nitrite (NO2-1) 
.02174 
Cobalt (Co+2)* 
.03394 
Phosphate (PO4-3)... 
.03159 
Copper (Cu+2)* 
.03148 
Potassium (K+1) 
.02557 
Cyanide (CN-1) 
.03844 
Sodium (NA+1) 
.04350 
Fluoride (F-1) 
.05264 
Strontium (Sr+2).... 
.02283 
Hydrogen (H+1) 
.99209 
Sulfate (SO4-2) 
.02082 
Hydroxide (OH-1) 
.05880 
Zinc (Zn+2)* 
.03060 
*Constituent reported in micrograms per liter; multiply by factor and divide 
results by 1,000. 
National Stream Quality Accounting Network (NASQAN) is a nationwide 
data-collection network designed by the U.S. Geological Survey to meet many of 
the information needs of government agencies and other groups involved in 
natural or regional water-quality planning and management. The 500 or so 
sites in NASQAN are generally located at the downstream ends of hydrologic 
accounting units designated by the U.S. Geological Survey office of Water Data 
Coordination in consultation with the Water Resources Council. The objectives 
of NASQAN are (1) to obtain information on the quality and quantity of water 
moving within and from the United States through a systematic and uniform 
process of data collection, summarization, analysis, and reporting such that 
the data may be used for, (2) description of the areal variability of water 
quality in the Nation's rivers through analysis of description of the areal 
variability of water quality in the Nation's rivers through analysis of data 
from this and other programs, (3) detection of changes or trends with time in 
the pattern of occurrence of water-quality characteristics, and (4) providing 
a nationally consistent data base useful for water-quality assessment and 
hydrologic research. 
 
  
  
 
 
 
 
 
 
38 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
National Trends Network (NTN) is a network for sampling atmospheric 
deposition in the United States. The purpose of the network is to determine 
the variability, both in location and in time, of the composition of atmos­
pheric deposition, which includes snow, rain, dust particles, aerosols, and 
gases. The core from which the NTN was built was the already-existing deposi­
tion-monitoring network of the National Atmospheric Deposition Program (NADP). 
Organism is any living entity. 
Organism count/area refers to the number of organisms collected and 
enumerated in a sample and adjusted to the number per unit area habitat, 
usually square meters (m2), acres, or hectare. Periphyton, benthic organisms, 
and macrophytes are expressed in these terms. 
Organism count/volume refers to the number of organisms collected and 
enumerated in a sample and adjusted to the number per sample volume, usually 
milliliters (mL) or liters (L). Numbers of planktonic organisms can be 
expressed in these terms. 
Total organism count is the total number of organisms collected and 
enumerated in any particular sample. 
Parameter Code is a 5-digit number used in the U.S. Geological Survey 
computerized data system, WATSTORE, to uniquely identify a specific constitu­
ent. The codes used in WATSTORE are the same as those used in the U.S. 
Environmental Protection Agency data system, STORET. The Environmental 
Protection Agency assigns and approves all requests for new codes. 
Partial-record station is a particular site where limited streamflow 
and/or water-quality data are collected systematically over a period of years 
for use in hydrologic analyses. 
Particle-size is the diameter, in millimeters (mm), of a particle deter­
mined by either sieve or sedimentation methods. Sedimentation methods (pipet, 
bottom-withdrawal tube, visual-accumulation tube) determine fall diameter of 
particles in either distilled water (chemically dispersed) or in native water 
(the river water at the time and point of sampling). 
Particle-size classification used in this report agrees with recommenda­
tions made by the American Geophysical Union Subcommittee on Sediment Termi­
nology. The classification is as follows: 
Classification 
Size (mm) 
Method of analysis 
Clay 
0.00024 - 0.004 
Sedimentation 
Silt 
.004 - .062 
Sedimentation 
Sand 
.062 
- 2.0 
Sedimentation or sieve 
Gravel 
2.0 
- 64.0 
Sieve 
The particle-size distributions given in this report are not necessarily 
representative of all particles in transport in the stream. Most of the 
organic matter is removed and the sample is subjected to mechanical and 
chemical dispersion before analysis in distilled water. Chemical dispersion 
is not used for native water analysis. 
39 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Percent composition is a unit for expressing the ratio of a particular 
part of a sample or population to the total sample or population, in terms of 
types, numbers, mass or volume. 
Periphyton is the assemblage of microorganisms attached to and living 
upon submerged solid surfaces. While primarily consisting of algae, they also 
include bacteria, fungi, protozoa, rotifers, and other small organisms. 
Pesticides are chemical compounds used to control undesirable organisms. 
Major categories of pesticides include insecticides, miticides, fungicides, 
herbicides, and rodenticides. 
Picocurie (PC, pCi) is one trillionth (1 X 10-1. 2) of the amount of 
ratioactivity represented by a curie (Ci). A curie is the amount of radio­
activity that yields 3.7 x 1010 radioactive disintegrations per second. A 
picocurie yields 2.22 dpm (disintegrations per minute). 
Plankton is the community of suspended, floating, or weakly swimming 
organisms that live in the open water of lakes and rivers. 
Phytoplankton is the plant part of the plankton. They are usually 
microscopic and their movement is subject to the water currents. Phyto­
plankton growth is dependent upon solar radiation and nutrient substan­
ces. Because they are able to incorporate as well as release materials 
to the surrounding water, the phytoplankton have a profound effect upon 
the quality of the water. They are the primary food producers in the 
aquatic environment, and are commonly known as algae. 
Blue-green algae are a group of phytoplankton organisms having 
a blue pigment, in addition to the green pigment called chlorophyll. 
Blue-green algae often cause nuisance conditions in water. 
Diatoms are the unicellular or colonial algae having a sili­
ceous shell. Their concentrations are expressed as number of cells 
per milliliter (cells/mL) of sample. 
Green algae have chlorophyll pigments similar in color to those 
of higher green plants. Some forms produce algae mats or floating 
"moss" in lakes. Their concentrations are expressed as number of 
cells per milliliter (cells/mL) of sample. 
Zooplankton is the animal part of the plankton. Zooplankton are ca­
pable of extensive movements within the water column and are often large 
enough to be seen with the unaided eye. Zooplankton are secondary consu­
mers feeding upon bacteria, phytoplankton, and detritus. Because they 
are the grazers in the aquatic environment, the zooplankton are a vital 
part of the aquatic food web. The zooplankton community is dominated by 
small crustaceans and rotifers. 
 
 
40 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Primary productivity is a measure of the rate at which new organic 
matter is formed and accumulated through photosynthetic and chemosynthe­
tic activity of producer organisms (chiefly, green plants). The rate of 
primary production is estimated by measuring the amount of oxygen 
released (oxygen method) or the amount of carbon assimilated by the 
plants (carbon method). 
Milligrams of carbon per area or volume per unit time [mg
2
C/(m .time] for periphyton and macrophytes and [mg C/(m .time)] for 
phytoplankton are units for expressing primary productivity. They 
define the amount of carbon dioxide consumed as measured by radio-
active carbon (carbon 14). 
The carbon 14 method is of greater 
sensitivity than the oxygen light and dark bottle method, and i^ 
preferred for use in unenriched waters. Unit time may be either 
hour or day, depending on the incubation period. 
Milligrams of oxygen per area or volume per unit ime [mg0 /
2
(m .time)] for periphyton and macrophytes and [mg0 /(m .time)] for 
phytoplankton are the units for expressing primary productivity. 
They define production and respiration rates as estimated from 
changes in the measured dissolved-oxygen concentration. The oxygen 
light and dark bottle method is preferred if the rate of primary 
production is sufficient for accurate measurements to be made within 
24 hours. Unit time may be either the hour or day, depending on the 
incubation period. 
Polychlorinated biphenyls (PCBs) are industrial chemicals that are mix­
tures of chlorinated biphenyl compounds having various percentages of chlo­
rine. They are similar in structure to organochlorine insecticides. 
Radiochemical program is a network of regularly sampled water-quality 
stations where samples are collected to be analyzed for radioisotypes. The 
streams that are sampled represent major drainage basins in the conterminous 
United States. 
Recoverable from bottom material is the amount of a given constituent 
that is in solution after a representative sample of bottom material has been 
digested by a method (usually using an acid or mixture of acids) that results 
in dissolution of readily soluble substances. Complete dissolution of all 
bottom material is not achieved by the digestion treatment and thus the 
determination represents less than the total amount (that is, less than 95 
percent) of the constituent in the sample. To achieve comparability of 
analytical data, equivalent digestion procedures would be required of all 
laboratories performing such analyses because different digestion procedures 
are likely to produce different analytical results. 
Return period is the average time interval between occurrences of a 
hydrological event of a given or greater magnitude, usually expressed in 
years. May also be called recurrence interval. 
Runoff in inches (IN, in) shows the depth to which the drainage area 
would be covered if all the runoff for a given time period were uniformly 
distributed on it. 
 
41 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Sediment is solid material that originates mostly from disintegrated 
rocks and is transported by, suspended in, or deposited from water; it in­
cludes chemical and biochemical precipitates and decomposed organic material, 
such as humus. The quantity, characteristics, and cause of the occurrence of 
sediment in streams are influenced by environmental factors. Some major 
factors are degree of slope, length of slope, soil characteristics, land 
usage, and quantity and intensity of precipitation. 
Bed load is the sediment that is transported in a stream by rolling, 
sliding, or skipping along the bed and very close to it. In this report, 
bed load is considered to consist of particles in transit within 0.25 ft 
of the streambed. 
Bed load discharge (tons per day) is the quantity of bed load 
measured by dry weight that moves past a section as bed load in a given 
time. 
Suspended sediment is the sediment that at any given time is main­
tained in suspension by the upward components of turbulent currents 
or that exists in suspension as a colloid. 
Suspended-sediment concentration is the velocity-weighted concentra­
tion of suspended sediment in the sampled zone (from the water surface to 
a point approximately 0.3 ft above the bed) expressed as milligrams of 
dry sediment per liter of water-sediment mixture (mg/L). 
Mean concentration is the time-weighted concentration of 
suspended sediment passing a stream section during a 24-hour day. 
Suspended-sediment discharge (tons/day) is the rate at which dry 
mass of sediment passes a section of a stream or is the quantity of 
sediment, as measured by dry mass or volume, that passes a section in a 
given time. 
It is calculated in units of tons per day as follows: 
concentrations (mg/L) x discharge ft /s) x 0.0027. 
Suspended-sediment load is a general term that refers to material in 
suspension. It is not synonymous with either discharge or concentration. 
Total sediment discharge (tons/day) is the sum of the suspended-
sediment discharge and the bed-load discharge. It is the total quantity 
of sediment, as measured by dry mass or volume, that passes a section 
during a given time. 
Total-sediment load or total load is a term which refers to the 
total sediment (bed load plus suspended-sediment load) that is in trans­
port. It is not synonymous with total-sediment discharge. 
42 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Sodium-adsorption-ratio (SAR) is the expression of relative activity of 
sodium ions in exchange reactions within soil and is an index of sodium or 
alkali hazard to the soil. Waters range in respect to sodium hazard from 
those which can be used for irrigation on almost all soils to those which are 
generally unsatisfactory for irrigation. 
Solute is any substance that is dissolved in water. 
Specific conductance is a measure of the ability of a water to conduct an 
electric current. It is expressed in microsiemens per centimeter at 25°C. 
Specific conductance is related to the type and concentration of ions in 
solution and can be used for approximating the dissolved-solids content of the 
water. Commonly, the concentration of dissolved solids (in milligrams per 
liter) is about 65 percent of the specific conductance (in micromhos). This 
relation is not constant from stream to stream, and it may vary in the same 
source with changes in the composition of the water. 
Stage-discharge relation is the relation between gage height (stage) and 
volume of water per unit of time, flowing in a channel. 
Streamflow is the discharge that occurs in a natural channel. Although 
the term "discharge" can be applied to the flow of a canal, the word 
"streamflow" uniquely describes the discharge in a surface stream course. The 
term "streamflow" is more general than "runoff" as streamflow may be applied 
to discharge whether or not it is affected by diversion or regulation. 
Substrate is the physical surface upon which an organism lives. 
Natural substrate refers to any naturally occurring emersed or 
submersed solid surface, such as a rock or tree, upon which an organism 
lives. 
Artificial substrate is a device which is purposely placed in a 
stream or lake for colonization of organisms. The artificial substrate 
simplifies the community structure by standardizing the substrate from 
which each sample is taken. Examples of artificial substrates are basket 
samplers (made of wire cages filled with clean streamside rocks) and 
multiplate samplers (made of hardboard) for benthic organism collection, 
and plexiglass strips for periphyton. 
Surface area of a lake is that area outlined on the latest U.S.G.S. 
topographic map as the boundary of the lake and measured by a planimeter in 
acres. In localities not covered by topographic maps, the areas are computed 
from the best maps available at the time planimetered. All areas shown are 
those for the stage when the planimetered map was made. 
Surficial bed material is that part (0.1 to 0.2 ft) of the bed material 
that is sampled using U.S. Series Bed-Material Samplers. 
Suspended (as used in tables of chemical analyses) refers to the amount 
(concentration) of the total concentration in a water-sediment mixture. It is 
associated with the material retained on a 0.45-micrometer filter. 
 
 
 
 
 
 
 
43 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Suspended, recoverable is the amount of a given constituent that is in 
solution after the part of a representative water-suspended sediment sample 
that is retained on a 0.45 um membrane filter has been digested by a method 
(usually using a dilute acid solution) that results in dissolution of only 
readily soluble substances. Complete dissolution of all the particulate 
matter is not achieved by the digestion treatment and thus the determination 
represents something less than the "total" amount (that is, less than 95 
percent) of the constituent present in the sample. To achieve comparability 
of analytical data, equivalent digestion procedures are required of all 
laboratories performing such analyses because different digestion procedures 
are likely to produce different analytical results. 
Determinations of "suspended, recoverable" constituents are made either 
by analyzing portions of the material collected on the filter or, more 
commonly, by difference, based on determinations of (1) dissolved and 
(2) total recoverable concentrations of the constituent. 
Suspended, total is the total amount of a given constituent in the part 
of representative water-suspended sediment sample that is retained on a 0.45 
um membrane filter. This term is used only when the analytical procedure 
assures measurement of at least 95 percent of the constituent determined. A 
knowledge of the expected form of the constituent in the sample, as well as 
the analytical methodology used, is required to determine when the results 
should be reported as "suspended, total." 
Determinations of "suspended, total" constituents are made either by 
analyzing portions of the material collected on the filter or, more commonly, 
by difference, based on determinations of (1) dissolved and (2) total concen­
trations of the constituent. 
Taxonomy is the division of biology concerned with the classification and 
naming of organisms. The classification of organisms is based upon a 
hierarchial scheme beginning with Kingdom and ending with Species at the base. 
The higher the classification level, the fewer features the organisms have in 
common. For example, the taxonomy of a particular mayfly, Hexagenia limbata, 
is the following: 
Kingdom 
Phylum 
Class 
Animal 
Arthopoda 
Insecta 
Order 
Family 
Genus 
Species 
Ephemeroptera 
Ephemeridae 
Hexagenia 
Hexagenia limbata 
Thermograph is an instrument that continuously records variations of 
temperature on a chart. The more general term "temperature recorder" is used 
in the table heading and refers to any instrument that records temperature 
whether on a chart, a tape, or any other medium. 
Time-weighted average is computed by multiplying the number of days in 
the sampling period by the concentrations of individual constituents for the 
corresponding period and dividing the sum of the products by the total number 
of days. A time-weighted average represents the composition of water that 
would be contained in a vessel or reservoir that had received equal quantities 
of water from the stream each day for the year. 
44 
WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Tons per acre-foot indicates the dry mass of dissolved solids in 1 
acre-foot of water. It is computed by multiplying the concentration of the 
constituent, in milligrams per liter by 0.00136. 
Tons per day (T/DAY) is the quantity of a substance in solution or 
suspension that passes a stream section during a 24-hour period._ 
Total is the total amount of a given constituent in a representative 
water-suspended sediment sample, regardless of the constituent's physical or 
chemical form. This term is used only when the analytical procedure assures 
measurement of at least 95 percent of the constituent present in both the 
dissolved and suspended phases of the sample. A knowledge of the expected 
form of the constituent in the sample, as well as the analytical methodology 
used, is required to judge when the results should be reported as "total." 
(Note that the word "total" does double duty here, indicating both that the 
sample consists of a water-suspended sediment mixture and that the analytical 
method determined all of the constituent in the sample.) 
Total discharge is the total quantity of any individual constituent, as 
measured by dry mass or volume, that passes through a stream cross-section per 
unit of time. This term needs to be qualified, such as "total sediment 
discharge," "total chloride discharge," and so on. 
Total, recoverable is the amount of a given constituent that is in 
solution after a representative water-suspended sediment sample has been 
digested by a method (usually using a dilute acid solution) that results in 
dissolution of only readily soluble substances. Complete dissolution of all 
particulate matter is not achieved by the digestion treatment, and thus the 
determination represents something less than the "total" amount (that is, less 
than 95 percent) of the constituent present in the dissolved and suspended 
phases of the sample. To achieve comparability of analytical data, equivalent 
digestion procedures are required of all laboratories performing such 
analyses, because different digestion procedures are likely to produce 
different analytical results. 
Tritium Network is a network of stations which has been established to 
provide baseline information on the occurrence of tritium in the Nation's 
surface waters. In addition to the surface-water stations in the network, 
tritium data are also obtained at a number of precipitation stations. The 
purpose of the precipitation stations is to provide an estimate sufficient for 
hydrologic studies of the tritium input to the United States. 
Water year in Geological Survey reports dealing with surface water supply 
is the 12-month period, October 1 through September 30. The water year is 
designated by the calendar year in which it ends and which includes 9 of the 
12 months. Thus, the year ending September 30, 1980, is called the "1980 
water year." 
WDR is used as an abbreviation for "Water-Data Report" in the REVISED 
RECORDS paragraph to refer to State annual hydrologic-data reports (WRD was 
used as an abbreviation for "Water-Resources Data" in reports published prior 
to 1976). 
45 
WATER RESOURCES FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 
Weighted average is used in this report to indicate discharge-weighted 
average. It is computed by multiplying the discharge for a sampling period by 
the concentrations of individual constituents for the corresponding period and 
dividing the sum of the products by the sum of the discharges. A discharge-
weighted average approximates the composition of water that would be found in 
a reservoir containing all the water passing a given location during the water 
year after thorough mixing in the reservoir. 
WSP is used as an abbreviation for "Water-Supply Paper" in references to 
previously published reports. 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
46 
PUBLICATIONS ON TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS 
The U.S. Geological Survey publishes a series of manuals describing procedures for 
planning and conducting specialized work in water-resources investigations. The material is grouped 
under major subject headings called books and is further divided into sections and chapters. 
For 
example, Section A of Book 3 (Applications of Hydraulics) pertains to surface water. 
The chapter, 
the unit of publication, is limited to a narrow field of subject matter. 
This format permits 
flexibility in revision and publication as the need arises. 
The reports listed below are for sale by the U.S. Geological Survey, Books and Open- File 
Reports Section, Federal Center, Box 25425, Denver, Colorado 80225 (authorized agent of the 
Superintendent of Documents, Government Printing Office). Prepayment is required. Remittance 
should be sent by check or money order payable to the U.S. Geological Survey. Prices are not 
included because they are subject to change. Current prices can be obtained by writing to the above 
address. 
When ordering or inquiring about prices for any of these publications, please give the 
title, book number, chapter number, and "U.S. Geological Survey Techniques of Water-Resources 
Investigations." 
1-D1. 
Water temperature--influential factors, field measurement, and data presentation, by H. H. 
Stevens, Jr., J. F. Ficke, and G. F. Smoot: USGS--TWRI Book 1, Chapter Dl. 1975. 65 
pages. 
1-D2. 
Guidelines for collection and field analysis of ground-water samples for selected unstable 
constituents, by W. W. Wood: USGS--TWRI Book 1, Chapter D2. 1976. 24 pages. 
2-D1. 
Application of surface geophysics to ground-water investigations, by A. A. R. Zohdy, G. P. 
Eaton, and D. R. Mabey: USGS--TWRI Book 2, Chapter Dl. 1974. 116 pages. 
2-El. 
Application of borehole geophysics to water-resourcee investigations, by W. S. Keys and L. 
M. MacCary: USGS--TWRI Book 2, Chapter El. 1971. 126 pages. 
3-Al. 
general field and office procedures for indirect discharge measurements, by M. A. Benson and 
Tate Dalrymple: USGS--TWRI Book 3, Chapter Al. 1967. 30 pages. 
3-A2. 
Measurement of peak discharge by the slope-area method, by Tate Dalrymple and M. A. 
Benson: USGS--TWRI Book 3, Chapter A2. 1967. 12 pages. 
3-A3. 
Measurement of peak discharge at culverts by indirect methods, by G. L. Bodhaine: USGS--
TWRI Book 3, Chapter A3. 1968. 60 pages. 
3-A4. 
Measurement of peak discharge at width contractions by indirect methods, by H. F. Matthai: 
USGS--TWRI Book 3, Chapter A4. 1967. 44 Pages. 
3-A5. 
Measurement of peak discharge at dams by indirect methods, by Harry Hulsing: USGS--TWRI 
Book 3, Chapter A5. 1967. 29 pages. 
3-A6. 
General procedure for gaging streams, by R. W. Carter and Jacob Davidian: USGS--TWRI Book 
3, Chapter A6. 1968. 13 pages. 
3-A7. 
Stage measurements at gaging stations, by T. J. Buchanan and W. P. Somers: 
USGS--TWRI Book 
3, Chapter A7. 1968. 28 pages. 
3-A8. 
Discharge measurements at gaging stations, by T. J. Buchanan and W. P. Somers: 
USGS--TWRI 
Book 3, Chapter A8. 1969. 65 pages. 
3-A9. 
Measurement of time of travel and dispersion in streams by dye tracing, by E. F. Hubbard, F. 
A. Kilpatrick, L. A. Martens, and J. F. Wilson, Jr.: USGS--TWRI Book 3, Chapter A9. 1982. 
44 pages. 
3-A10. Discharge ratings at gaging stations, by E. J. Kennedy: USGS--TWRI Book 3, Chapter A10. 
1984. 59 pages. 
3-All. Measurement of discharge by moving-boat method, by G. F. Smoot and C. E. Novak: USGS--TWRI 
Book 3, Chapter All. 1969. 22 pages. 
3-A13. Computation of continuous records of streamflow, by E. J. Kennedy: USGS--TWRI Book 3, 
Chapter A13. 1983. 53 pages. 
3-A14. Use of flumes in measuring discharge, by F. A. Kilpatrick and V. R. Schneider: 
USGS--TWRI 
Book 3, Chapter A14. 1983. 46 pages. 
3-A15. Computation of water-surface profiles in open channels, by Jacob Davidiai: 
USGS--TWRI Book 
3, Chapter A15. 1984. 48 pages. 
3-61. 
Aquifer-test design, observation, and data analysis, by R. W. Stallman: 
USGS--TWRI Book 3, 
Chapter Bl. 1971. 26 pages. 
3-B2. 
Introduction to ground-water hydraulics, a programed text for self-instruction, by G. D. 
Bennett: USGS--TWRI Book 3, Chapter B2. 1976. 172 pages. 
3-63. 
Type curves for selected problems of flow to wells in confined aquifers, by J. E. Reed: 
USGS-TWRI Book 3, Chapter B3. 1980. 106 pages. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
PUBLICATIONS ON TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS-Continued 
3-Cl. 
Fluvial sediment concepts by H. P. Guy: USGS--TWRI Book 3, Chapter Cl. 1970. 55 pages. 
3-C2. 
Field methods for measurement of fluvial sediment. by H. P. Guy and V. W. Norman: USGS--
TWRI Book 3, Chapter C2. 1970. 59 pages. 
3-C3. 
Computation of fluvial-sediment discharge by George Porterfield: USGS--TWRI Book 3, 
Chapter C3. 1972. 66 pages. 
4-Al. 
Some statistical tools in hydrology, by H. C. Riggs: USGS--TWRI Book 4, Chapter Al. 1968. 
39 pages. 
4-A2. 
Frequency curves by H. C. Riggs: USGS--TWRI Book 4, Chapter A2. 1968. 15 pages. 
4-B1. 
Low-flow investigations, by H. C. Riggs: USGS--TWRI Book 4, Chapter Bl. 1972. 18 pages. 
4-B2. 
Storage analyses for water supply, by H. C. Riggs and C. H. Hardison: USGS--TWRI Book 4, 
Chapter B2. 1973. 20 pages. 
4-B3. 
Regional analyses of streamflow characteristics by H. C. Riggs: USGS--TWRI Book 4, Chapter 
B3. 1973. 15 pages. 
441. 
Computation of rate and volume of stream depletion by wells by C. T. Jenkins: USGS--TWRI 
Book 4, Chapter 01. 1970. 17 pages. 
5-Al. 
Methods for determination of inorganic substances in water and fluvial sediments by M. W. 
Skougstad and others, editors: USGS--TWRI Book 5, Chapter Al. 1979. 626 pages. 
5-A2. 
Determination of minor elements in water by emission spectroscopy. by P. R. Barnett and E. 
C. Mallory, Jr.: USGS--TWRI Book 5, Chapter A2. 1971. 31 pages. 
5-A3. 
Methods for analysis of organic substances in water. by D. F. Goerlitz and Eugene Brown: 
USGS--TWRI Book 5, Chapter A3. 1972. 40 pages. 
5-A4. 
Methods for collection and analysis of aquatic biological and microbiological samples 
edited by P. E. Greeson, T. A. Ehlke, G. A. Irwin, B. W. Lium, and K. V. Slack: USGS--TWRI 
Book 5, Chapter A4. 1977. 332 pages. 
5-A5. 
Methods for determination of radioactive substances in water and fluvial sediments. by L. L. 
Thatcher, V. J. Janzer, and K. W. Edwards: USGS--TWRI Book 5, Chapter A5. 1977. 95 pages. 
5-A6. 
Quality assurance practices for the chemical and biological analyses of water and fluvial 
sedments, by L. C. Friedman and D. E. Erdmann: USGS--TWRI Book 5, Chapter A6. 1982. 181 
pages. 
S-Cl. 
Laboratory theory and methods for sediment analysis. by H P. Guy: USGS--TWRI Book 5, 
Chapter Cl. 1969. 58 pages. 
7-Cl. 
Finite difference model for aquifer simulation in two dimensions with results of numerical 
experiments, by P. C. Trescott, G. F. Pinder, and S. P. Larson: USGS--TWRI Book 7, Chapter 
Cl. 1976. 116 pages. 
7-C2. 
Computer model of two-dimensional solute transport and dispersion in ground water, by L. F. 
Konikow and J. D. Bredehoeft: USGS--TWRI Book 7, Chapter C2. 1978. 90 pages. 
7-C3. 
A model for simulation of flow in singular and interconnected channels 
by R. W. 
Schaffrannek, R. A. Baltzer, and D. E. Goldberg: USGS--TWRI Book 7, Chapter C3. 1981. 110 
pages. 
8-Al. 
Methods of measuring water levels in deep wells by M. S. Garber and F. C. Koopman: USGS--
TWRI Book 8, Chapter Al. 1968. 23 pages 
8-A2. 
Installation and service manual for U.S. Geological Survey manometers by J. D. Craig: 
USGS--TWRI Book 8, Chapter A2. 1983. 57 pages. 
8-B2. 
Calibration and maintenance of vertical-axis type current meters by G. F. Smoot and C. 
Novak: USGS--TWRI Book 8, Chapter B2. 1968. 15 pages. 
47 
Surface 
and 
Quality-of-Water Records 
for 
Puerto Rico 
   
 
ATLANTIC 
OCEAN 
ISABELA 
0114 
QUEBRADILLAS 
• 202 
AGUADILLA 
• 165 
0112 
0110 
010790 
Drainage boundaries indeterminate 
in limestone terrane 
010720 
Limestone 
igneous 
sedimentary rocks 
0106 
ARE 
Rin Cuisbrinos 
basin 
Grande de 
Aiiascia basin 
EXPLANATION 
A 0106 SURFACE—WATER STATION AND NUMBER 
V 0105 QUALITY—OF—WATER STATION AND NUMBER 
10720 QUALITY—OF—WATER PARTIAL RECORD 
V 
STATION AND NUMBER 
0165 WELL AND WELL NUMBER 
\--Map area 
A 
2 
3 
4 
5 IILOM5TERS 
5 MILES 
Figure 11.--Rio Guajataca basin. 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
 
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
RIO GUAJATACA BASIN 
50010500 RIO GUAJATACA AT TARES, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°18'01", long 66°52'24", at bridge on Highway 111 (km 32.9), 0.1 mi (0.2 km) upstream from 
Quebrada Anon, and 0.4 mi (0.6 km) northeast of Lares plaza. 
DRAINAGE AREA.--3.16 sq mi (8.18 sq km). 
PERIOD OF RECORD.--Water years 1958-71, 1974 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- ,=ECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- . 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
31... 
1445 
15 
260 
7.60 
23.0 
9.0 
<10 
480 
520 
DEC 
13... 
0925 
6.8 
205 
7.80 
20.0 
1.4 
9.1 
99 
<10 
K660 
2300 
FEB 1986 
13... 
0710 
2.2 
21B 
7.85 
19.0 
2.6 
6.4 
72 
12 
K630 
5900 
MAY 
02... 
1115 
15 
258 
7.75 
23.0 
21 
7.9 
94 
18 
5000 
K9100 
JUL 
07... 
1550 
348 
7.53 
23.5 
260 
7.9 
95 
110 
45000 
71000 
SEP 
08... 
1310 
3.1 
233 
7.35 
25.5 
840 
7.7 
97 
35 
K1400 
720 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD- 
SLUM, WATER 
SULFATE RIDE, 
NESS 
WATER 
DIS- 
DIS- 
DIS- 
SORP- 
DIS- 
TOTAL 
SULFIDE 
DIS- 
DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS. SO4) 
AS CL) 
OCT 1985 
31... 
76 
2 
22 
5.0 
10 
0.5 
2.2 
74 
<0.5 
8.1 
9.7 
DEC 
13... 
-- 
79 
FEB 1986 
13... 
82 
MAY 
02... 
91 
10 
29 
4.6 
8.6 
0.4 
2.6 
81 
<0.5 
12 
9.5 
JUL 
7... 
52 
SEP 
8... 
70 
3 
17 
6.8 
14 
0.7 
3.4 
67 
17 
12 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE N024-NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
S102) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
31... 
<0.10 
28 
130 
5.2 
19 
2.09 
0.010 
2.10 
0.050 
0.35 
DEC 
13... 
3 
1.79 
0.010 
1.80 
0.020 
0.28 
FEB 1986 
13... 
7 
<0.010 
0.900 
0.020 
0.18 
MAY 
02... 
<0.10 
21 
140 
5.6 
22 
1.88 
0.020 
1.90 
0.110 
0.39 
JUL 
7... 
1.14 
0.060 
1.20 
0.250 
1.7 
SEP 
8... 
0.30 
22 
130 
1.1 
1.29 
0.010 
1.30 
0.290 
0.11 
K = non-ideal count 
52 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
  
 
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
RIO GUAJATACA BASIN 
50010500 RIO GUAJATACA AT LARES, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
31... 
0.40 
2.5 
11 
0.060 
<1 
<100 
20 
1 
8 
<10 
DEC 
13... 
0.30 
2.1 
9.3 
0.060 
FEB 1986 
13... 
0.20 
1.1 
4.9 
0.030 
MAY 
02... 
0.50 
2.4 
11 
0.060 
1 
<100 
20 
<1 
8 
10 
JUL 
7... 
1.9 
3.1 
14 
0.210 
SEP 
8... 
0.40 
1.7 
7.5 
0.220 
-- 
MANGA- 
METHY- 
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
31... 
650 
3 
50 <0.10 
<1 
<1 
50 <0.010 
2 0.06 
DEC 
13... 
FEB 1986 
13... 
MAY 
02... 
1200 
2 
80 0.10 
<1 
<1 
10 <0.010 
<1 0.05 
JUL 
07...
-- 
SEP 
08... 
PESTICIDE ANALYSES 
CHLOR- 
DI- 
DI- 
PCB, ALDRIN, DANE, ODD, DDE, DDT, AZINON, ELDRIN 
DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
18... 
1110 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.12 <0.010 
HEPTA- 
METH- 
ENDO- 
HEPTA- CHLOR 
MALA- OXY- 
SULFAN. ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, 
DATE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
18... 
<0.010 <0.010 <0.01 <0.010 <0.010 <0.010 0.01 <0.01 
NAPH- 
THA- 
METHYL METHYL 
LENES. 
PARA- 
TRI- 
PARA- 
POLY- 
PER- 
TOX- 
TOTAL 
THION, THION, MIREX, THION, CHLOR. THANE APHENE, TR1-
DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/1)' (UG/L) (UG/L) 
JUL 1986 
18... 
<0.01 
<0.01 
<0.01 
<0.01 
<0.10 
<0.1 
<1 
<0.01 
53 
I
I
I
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
   
54 
RIO GUAJATACA BASIN 
50010600 RIO GUAJATACA ABOVE LAGO GUAJATACA, PR 
LOCATION.--Lat 18°19'57•. long 66°55'29•, Hydrologic Unit 21010002, 1.0 mi (1.6 km) off road 451, 3 mi (5 km) south 
of Lago Guajataca, 1.0 i (1.6 km) east of Eneas and 2.0 •i (3.2 km) west of Piletas. 
DRAINAGE AREA.--Indeterminate. 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--July 1984 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 565 ft (172 m), from topographic map. 
REMARKS.--Estimated daily discharges: Apr. 25 to May 6, May 13-20, May 26 to June 9, June 26-30, July 13, 14 and 
Aug. 3-5. Records fair except those for estimated daily discharges, which are poor. 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,600 ft,/s (73.6 •'/s), May 18, 1985. gage height, 12.03 ft 
(3.667 m), from rating curve extended above 100 ft'/s (2.83 
3/s) on the basis of step-backwater analysis; 
minimum discharge, 1.9 ft'is (0.054 •'/s), Feb. 11, 17, 1986. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft'is (42.5 
3/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft'is) 
(leis) 
(ft) 
(m) 
Date 
Time 
(W/s) 
(e/s) 
(ft) 
(m) 
Oct. 6 
1800 
1,540 
43.6 
10.08 3.072 
Nov. 5 
1700 
1,790 
50.7 
10.60 3.231 
Oct. 26 
1730 
2,400 
68.0 
11.69 3.563 
May 13 
0630 
2,280 
64.6 
11.50 3.505 
Oct. 27 
1545 
*2,550 
72.2 
*11.95 3.642 
May 13 
2100 
2,420 
66.5 
11.72 3.572 
Oct. 28 
1630 
1,620 
45.9 
10.24 3.121 
June 10 
1600 
1,740 
49.3 
10.50 3.200 
Nov. 3 
1700 
2,130 
60.3 
11.23 3.423 
Sept. 3 
1600 
1,660 
47.0 
10.33 3.149 
Minimum discharge, 1.9 ft'is (0.054 m'/s), Feb. 11, 17. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
114 
43 
17 
7.0 
3.7 
3.0 
11 
101 
39 
12 
38 
13 
2 
55 
36 
17 
6.8 
3.7 
2.7 
9.2 
120 
35 
12 
74 
195 
3 
26 
338 
16 
8.7 
20 
78 
42 
165 
32 
13 
47 
226 
4 
17 
219 
15 
6.9 
35 
45 
52 
82 
30 
11 
23 
70 
5 
14 
311 
15 
6.0 
6.8 
15 
80 
203 
29 
10 
20 
26 
6 
228 
207 
15 
5.7 
3.6 
12 
31 
521 
27 
13 
19 
18 
7 
688 
98 
14 
5.7 
3.1 
8.9 
24 
277 
60 
35 
17 
13 
8 
158 
62 
13 
5.7 
2.6 
7.9 
43 
156 
54 
15 
84 
11 
9 
75 
48 
14 
10 
2.3 
6.8 
83 
136 
27 
12 
118 
9.4 
10 
52 
42 
13 
11 
2.4 
5.5 
63 
240 
204 
10 
77 
8.4 
11 
55 
35 
13 
6.2 
2.2 
9.2 
27 
139 
79 
18 
56 
7.8 
12 
113 
32 
12 
5.9 
3.0 
9.5 
19 
139 
46 
12 
30 
8.1 
13 
61 
30 
13 
5.8 
3.3 
6.1 
15 
650 
36 
10 
28 
7.2 
14 
37 
33 
11 
5.5 
3.3 
5.4 
12 
190 
28 
52 
24 
7.1 
15 
31 
139 
11 
5.0 
2.9 
5.4 
11 
100 
43 
48 
19 
6.6 
16 
26 
152 
11 
5.0 
2.5 
6.9 
10 
80 
28 
25 
18 
6.5 
17 
21 
165 
10 
4.9 
3.3 
224 
101 
62 
22 
23 
19 
8.2 
18 
20 
88 
9.5 
4.5 
3.4 
95 
82 
52 
53 
19 
18 
9.1 
19 
17 
54 
9.5 
4.2 
17 
25 
42 
45 
34 
12 
14 
6.1 
20 
16 
45 
9.2 
3.9 
49 
15 
68 
40 
23 
77 
13 
5.9 
21 
15 
48 
9.0 
3.8 
19 
11 
118 
34 
27 
33 
12 
6.4 
22 
14 
36 
8.6 
4.2 
5.9 
8.9 
157 
26 
22 
16 
12 
10 
23 
62 
32 
8.7 
3.4 
4.2 
7.7 
165 
35 
19 
14 
9.7 
7.5 
24 
48 
28 
7.8 
3.2 
3.9 
7.3 
172 
42 
17 
16 
8.9 
5.9 
25 
44 
26 
7.7 
4.0 
3.8 
7.4 
83 
43 
16 
66 
8.5 
15 
26 
320 
23 
7.4 
3.3 
3.4 
7.0 
57 
170 
18 
200 
13 
10 
27 
461 
22 
7.4 
4.4 
4.2 
15 
49 
100 
14 
85 
16 
5.0 
28 
266 
20 
7.8 
3.7 
3.2 
18 
36 
68 
13 
38 
25 
22 
29 
102 
19 
7.4 
6.2 
---
65 
57 
78 
13 
25 
18 
11 
30 
71 
18 
7.3 
6.3 
34 
76 
66 
13 
27 
20 
6.3 
31 
54 
---
6.9 
6.5 
15 
---
45 
---
51 
15 
---
TOTAL 
3281 
2449 
344.2 
173.4 
220.7 
782.6 
1795.2 
4205 
1101 
1010 
914.1 
761.5 
MEAN 
106 
81.6 
11.1 
5.59 
7.88 
25.2 
59.8 
136 
36.7 
32.6 
29.5 
25.4 
MAX 
688 
338 
17 
11 
49 
224 
172 
650 
204 
200 
118 
226 
MIN 
14 
18 
6.9 
3.2 
2.2 
2.7 
9.2 
26 
13 
10 
8.5 
5.0 
CFSM 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
IN. 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
AC-FT 
6510 
4860 
683 
344 
438 
1550 
3560 
8340 
2180 
2000 
1810 
1510 
CAL YR 1985 TOTAL 
13641.9 
MEAN 
37.4 
MAX 
792 
MIN 
3.2 
CFSM 
.00 
IN. 
.00 
AC-FT 
27060 
WTR YR 1986 TOTAL 
17037.7 
MEAN 
46.7 
MAX 
688 
MIN 
2.2 
CFSM 
.00 
IN. 
.00 
AC-FT 
33790 
55 
RIO GUAJATACA BASIN 
50010600 RIO GUAJATACA ABOVE LAGO GUAJATACA, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS AUGUST 1984 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
DATE 
TIME 
INSTANTANEOUS 
DUCTANCE 
TURE 
DATE 
TIME 
INSTANTANEOUS 
DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
NOV, 19 1306 
54 
366 
24.0 
JUL, 07 1045 
13 
287 
24.0 
DEC, 09 1444 
14 
305 
22.5 
AUG, 05 1255 
19 
370 
24.5 
JUN, 09 1048 
31 
254 
22.5 
SEP, 03 1213 
32 
310 
23.0 
 
 
         
 
    
 
     
 
 
   
 
        
          
        
          
 
 
          
 
         
 
  
 
    
         
  
 
          
         
          
 
    
 
    
          
 
    
          
56 
RIO GUAJATACA BASIN 
50011000 CANAL PRINCIPAL DE DIVERSIONES AT LAGO DE GUAJATACA, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°24'02", long 66°55'27", off Highway 476 at Lago Guajataca outlet, 3.0 mi (4.8 km) southwest of 
Segunda Unidad Baldorioty de Castro, and 5.3 mi (8.5 km) south of Quebradillas Plaza. 
DRAINAGE AREA.--Indeterminate. 
PERIOD OF RECORD.--Water years 1958-64, 1974 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLT- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
1NSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
04... 
0800 
50 
309 
7.40 
25.5 
6.0 
1.2 
15 
10 
350 
K160 
DEC 
12... 
1345 
E55 
389 
7.40 
24.5 
1.2 
1.6 
19 
<10 
<1 
K6 
FEB 1986 
12... 
1322 
65 
302 
7.65 
24.5 
1.0 
3.0 
37 
13 
K3 
K5 
MAY 
02... 
0740 
55 
429 
7.50 
24.5 
10 
1.3 
19 
K140 
54 
JUL 
08... 
0805 
70 
287 
7.12 
25.5 
2.5 
1.8 
22 
<10 
K8 
21 
SEP 
08... 
1540 
70 
335 
6.95 
26.5 
2.4 
1.7 
22 
22 
200 
270 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM ROTAS- LINITY 
FARO- NONCARB CALCIUM SLUM, SODIUM, 
AD-
SLUM, WATER 
SULFATE 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
OCT 1985 
04... 
140 
5 
52 
3.4 
5.3 
0.2 
2.7 
139 
<0.5 
9.4 
DEC 
12... 
131 
FEB 1986 
12... 
128 
MAY 
02... 
140 
4 
50 
3.6 
5.3 
0.2 
1.8 
136 
<0.5 
10 
JUL 
08... 
130 
SEP 
08... 
140 
10 
51 
4.2 
6.2 
0.2 
1.8 
135 
9.3 
SOLIDS, 
SOLIDS, 
CHLO-
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS CL) 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
04... 
8.1 
0.10 
5.1 
170 
23 
4 
<0.010 
<0.100 
0.160 
0.44 
DEC 
12... 
2 
<0.010 
0.200 
0.020 
0.38 
FEB 1986 
12... 
2 
<0.010 
0.100 
0.030 
0.37 
MAY 
02... 
7.7 
<0.10 
6.6 
170 
25 
1 
<0.010 
0.300 
0.040 
0.36 
JUL 
08... 
5 
<0.010 
<0.100 
0.080 
0.42 
SEP 
08... 
6.8 
0.10 
7.9 
170 
32 
9 
<0.010 
0.100 
0.180 
0.42 
K = non-ideal count 
E - estimate 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
RIO GUAJATACA BASIN 
50011000 CANAL PRINCIPAL DE DIVERSIONES AT LAGO DE GUAJATACA, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
04... 
0.60 
0.020 
2 
<100 
20 
<1 
7 
<10 
DEC 
12... 
0.40 
0.60 
2.7 
0.010 
FEB 1986 
12... 
0.40 
0.50 
2.2 
<0.010 
MAY 
02... 
0.40 
0.70 
3.1 
0.030 
1 
<100 
<10 
1 
5 
10 
JUL 
08... 
0.50 
0.020 
SEP 
08... 
0.60 
0.70 
3.1 
0.030 
MANGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
04... 
230 
3 
200 
<0.10 
1 
<1 
10 
<0.010 
2 
0.04 
DEC 
12... 
FEB 1986 
12... 
MAY 
02... 
110 
1 
70 
0.20 
<1 
<1 
20 
<0.010 
<1 
0.05 
JUL 
08... 
SEP 
08... 
57 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
    
    
58 
RIO GUAJATACA BASIN 
50011200 RIO GUAJATACA BELOW LAGO GUAJATACA, PR 
LOCATION.--Lat 18'24'01', long 66'55'40", Hydrologic Unit 21010002, on left bank, 250 ft (76 m) downstream from 
bridge on Highway 476, 1,000 ft (305 m) downstream from outlet tunnel, and 5.2 mi (8.4 km) southeast of 
Quebradillas. 
DRAINAGE AREA.--Indeterminate. 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--August 1969 to December 1970, April 1984 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 535 ft (163 m), from topographic map. 
REMARKS.--No estimated daily discharges during water year. Records fair except those for June 4-30, Aug. 1 to 
Sept. 3 and Sept. 5-19, which are poor. Flow regulated by Lago Guajataca Dam. Low flows are from seepage 
through and under dam and nearby springs. 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,350 ft 3 /$ (38.2 e/s), May 13, 1986, gage height, 11.97 ft 
(3.648 m), from rating curve extended above 400 ftVs (11.3 m 3 /s) on basis of step-backwater analysis; 
minimum discharge, 0.53 ft'is (0.015 m 3 /s), May 31, June 1, 1984. 
EXTREMES FOR CURRENT YEAR.--Maximum discharge, 1,350 ftqs (38.2 mVs), May 13, gage height, 11.97 ft (3.648 m); 
minimum discharge, 0.68 ft'/s (0.019 80/s), Jan. 27, Mar. 16. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
2 
3 
4 
5 
4.2 
162 
354 
353 
310 
431 
379 
379 
401 
437 
2.5 
2.6 
3.7 
3.2 
2.4 
1.0 
1.1 
1.5 
1.2 
1.3 
.79 
.76 
.90 
1.3 
.86 
1.2 
1.2 
1.3 
.95 
.88 
1.2 
1.6 
1.7 
1.3 
2.7 
386 
485 
481 
481 
483 
495 
494 
492 
282 
119 
1.5 
1.5 
1.6 
1.5 
1.6 
1.7 
1.6 
1.5 
1.5 
1.8 
1.7 
2.3 
1.8 
1.6 
95 
6 
7 
8 
9 
10 
288 
467 
537 
523 
520 
461 
489 
494 
492 
490 
2.0 
1.6 
1.5 
1.4 
1.5 
1.2 
1.3 
1.4 
1.6 
1.3 
.90 
.87 
.86 
.82 
.83 
.86 
.85 
.82 
.78 
.78 
1.3 
1.3 
3.5 
1.8 
1.4 
606 
703 
444 
561 
560 
55 
1.5 
1.4 
1.4 
1.7 
1.5 
1.4 
1.6 
1.8 
1.8 
1 8 
1 8 
75 
145 
146 
214 
213 
191 
159 
159 
11 
12 
13 
14 
15 
518 
515 
512 
466 
377 
488 
385 
112 
3 0 
101 
1.5 
1.5 
1.4 
1.3 
1.4 
1.0 
.98 
.99 
1.2 
1.2 
1.0 
.97 
.94 
.88 
.73 
.79 
.76 
.71 
.71 
.71 
1.3 
1.3 
1.3 
1.3 
1.4 
583 
540 
835 
1110 
711 
1.5 
1.4 
1.4 
1.3 
1.4 
1.8 
1.8 
1.8 
1.8 
2.0 
132 
178 
192 
365 
395 
60 
1.6 
1.9 
2.0 
1.9 
16 
17 
18 
19 
20 
184 
2.5 
2.3 
2.2 
2.0 
271 
272 
335 
367 
363 
1.4 
1.8 
1.3 
1.3 
1.3 
1.1 
1.1 
1.0 
.95 
.94 
.75 
.75 
.78 
.94 
1.1 
.71 
.77 
.98 
1.0 
1.0 
1.5 
1.6 
1.7 
1.9 
2.4 
590 
521 
500 
505 
503 
1.4 
1.5 
1.4 
1.4 
1.4 
1.9 
1.9 
1.8 
1.8 
1.8 
341 
340 
240 
194 
104 
1.9 
1.7 
1.6 
1.6 
1.6 
21 
22 
23 
24 
25 
2.0 
2.2 
2.4 
1.8 
59 
396 
172 
3.2 
2.0 
2.1 
1.5 
1.4 
1.3 
1.3 
1.3 
.88 
.88 
.86 
.85 
.95 
.94 
.82 
.78 
.78 
.83 
.88 
.82 
.83 
.87 
1.3 
151 
349 
368 
396 
457 
502 
500 
498 
495 
494 
1.3 
1.4 
1.3 
1.3 
1.3 
1.8 
2.0 
2.2 
2.2 
2.0 
1.8 
2.9 
2.6 
2.2 
2.2 
1.7 
1.9 
2.2 
2.0 
1.9 
26 
27 
28 
29 
30 
31 
155 
306 
455 
455 
454 
454 
2.4 
2.3 
2.3 
2.3 
2.6 
---
1.4 
1.3 
1.3 
1.1 
1.0 
1.0 
.89 
.78 
.77 
.80 
.84 
.84 
1.1 
1.1 
1.1 
1.3 
1.2 
1.4 
1.3 
1.2 
1.2 
480 
477 
386 
313 
314 
---
496 
495 
496 
495 
495 
496 
1.3 
1.3 
1.2 
1.3 
1.4 
---
1.9 
2.0 
1.7 
1,5 
1.6 
2.9 
2.2 
1.8 
1.9 
1.7 
1.7 
1.7 
1.8 
1.4 
1.4 
1.4 
1.4 
---
TOTAL 
MEAN 
MAX 
MIN 
CFSM 
IN. 
AC-FT 
8445.6 
272 
537 
1.8 
.00 
.00 
16750 
7737.2 
258 
494 
2.0 
.00 
.00 
15350 
50.5 
1.63 
3.7 
1.0 
.00 
.00 
100 
32.70 
1.05 
1.6 
.77 
.00 
.00 
65 
25.18 
.90 
1.3 
.73 
.00 
.00 
50 
30.06 
.97 
1.4 
.71 
.00 
.00 
60 
3724.5 
124 
480 
1.2 
.00 
.00 
7390 
17050 
550 
1110 
386 
.00 
.00 
33820 
1970.2 
65.7 
495 
1.2 
.00 
.00 
3910 
56.0 
1.81 
2.9 
1.4 
.00 
.00 
111 
2881.4 
92.9 
395 
1.5 
.00 
.00 
5720 
1131.3 
37.7 
214 
1.4 
.00 
.00 
2240 
CAL YR 1985 
WTR YR 1986 
TOTAL 
TOTAL 
20616.28 
43134.64 
MEAN 
MEAN 
56.5 
118 
MAX 
MAX 
537 
1110 
MIN 
MIN 
.79 
.71 
CFSM 
CFSM 
.00 
.00 
IN. 
IN. 
.00 
.00 
AC-FT 
AC-FT 
40890 
85560 
59 
RIO GUAJATACA BASIN 
50011200 RIO GUAJATACA BELOW LAGO DE GUAJATACA, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS APRIL 1984 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
STREAMFLOW, 
SPECIFIC CON-
TEMPERA­
DATE 
TIME INSTANTANEOUS 
DUCTANCE 
TURE 
DATE 
TIME INSTANTANEOUS 
DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
NOV, 20 1428 
326 
287 
24.5 
JUL, 07 1303 
1.4 
344 
27.0 
MAY, 20 1339 
411 
275 
24.0 
AUG, 06 1219 
1.7 
352 
27.0 
JUN, 10 1105 
1.6 
410 
26.0 
SEP, 03 1428 
1.8 
380 
26.5 
I 
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I
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
  
  
  
  
  
  
   
   
60 
RIO GUAJATACA BASIN 
50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR 
LOCATION.--Lat 18'28'31'. long 66'57'46", Hydrologic Unit 21010002, on left bank at ford 1.7 mi (2.7 km) upstream 
fro bridge on Highway 2, 1.6 i (2.6 km) west of Quebradillas plaza. 2.1 mi (3.4 km) upstream from the Atlantic 
Ocean, and 6.6 mi (10.6 km) downstream from Lago Guajataca. 
DRAINAGE AREA.--Indeterminate. 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--February to May 1969 (monthly measurements only). July 1969 to December 1970, April 1984 to 
current year. 
GAGE.--Water-stage recorder. Elevation of gage is 0.0 ft (0.0 ), from topographic map. 
REMARKS.--Estimated daily discharges: Oct. 3-8, Dec. 4-7, 9-19, 24-31, Jan. 1, 6-9. 11-21, 27-31, Feb. 1, 15-18, 
22-28, Mar. 1-6, 23-26, 28-31. Apr. 21, Nov. 20-22, May 14 to June 10 and Aug. 24 to Sept. 12. Records fair 
except those for estimated daily discharges, which are poor. Flow regulated by Lago Guajataca 6.6 mi (10.6 km). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 6,200 ft'/s (176 m'/s), May 13, 1986, estimated based on a mean 
daily discharge correlation with station 50011200, 6.5 miles upstream; minimum discharge, 6.2 ft'A (0.176 '/s). 
Sept. 4, 9-12, 1984. 
EXTREMES FOR CURRENT YEAR.--Maximum discharge, 6,200 ft'is (176 m 3/s), May 13, 1986; minimum discharge, 8.6 ft'is 
(0.24 '/s). Dec. 24, Jan. 2. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
2 
3 
4 
5 
55 
187 
820 
820 
720 
845 
370 
391 
663 
885 
12 
12 
11 
12 
12 
9.5 
8.8 
8.8 
9.0 
9.2 
9.3 
9.0 
9.2 
10 
11 
11 
11 
16 
12 
12 
15 
14 
14 
16 
20 
548 
1250 
1190 
1450 
1320 
1100 
1100 
1100 
390 
80 
19 
19 
19 
19 
19 
12 
11 
11 
12 
11 
12 
25 
35 
60 
100 
6 
7 
8 
9 
10 
680 
1100 
1200 
1390 
1240 
922 
1150 
1080 
1020 
962 
12 
11 
9.3 
10 
11 
10 
9.5 
9.5 
18 
9.9 
9.7 
9.6 
9.6 
9.7 
9.7 
12 
11 
11 
11 
12 
18 
16 
27 
41 
21 
1960 
2650 
1440 
1390 
1360 
45 
37 
31 
28 
32 
19 
19 
19 
19 
19 
12 
12 
17 
44 
45 
190 
180 
170 
160 
150 
11 
12 
13 
14 
15 
1190 
1240 
1220 
1040 
708 
945 
725 
78 
14 
118 
11 
11 
10 
10 
10 
10 
10 
9.5 
9.0 
9.3 
9.7 
9.6 
9.5 
9.6 
10 
12 
12 
13 
13 
14 
17 
16 
16 
16 
16 
1410 
1430 
3000 
4300 
2000 
40 
30 
29 
27 
26 
20 
19 
19 
18 
19 
38 
77 
81 
214 
284 
22 
18 
24 
19 
19 
16 
17 
18 
19 
20 
429 
17 
11 
9.9 
9.3 
659 
492 
349 
468 
389 
10 
10 
10 
9.8 
9.1 
9.3 
8.8 
9.8 
9.8 
9.8 
10 
10 
10 
10 
9.7 
14 
14 
14 
15 
14 
16 
16 
17 
17 
18 
1250 
1100 
1100 
1100 
1100 
25 
25 
25 
25 
25 
19 
17 
18 
17 
16 
196 
187 
124 
67 
56 
19 
19 
18 
19 
17 
21 
22 
23 
24 
25 
9.0 
9.2 
9.3 
11 
10 
539 
317 
14 
11 
11 
9.2 
9.5 
9.3 
9.4 
9.3 
9.5 
9.1 
9.0 
9.0 
9.1 
9.9 
11 
10 
11 
11 
14 
14 
14 
14 
14 
82 
813 
726 
878 
953 
1100 
1100 
1100 
1100 
1100 
35 
25 
31 
23 
22 
15 
14 
14 
16 
18 
13 
13 
22 
30 
20 
18 
18 
17 
17 
17 
26 
27 
28 
29 
30 
31 
46 
347 
991 
876 
860 
818 
11 
12 
14 
14 
12 
---
9.3 
9.3 
9.5 
9.5 
9.3 
9.5 
9.4 
9.5 
9.5 
9.5 
9.5 
9.5 
11 
11 
11 
14 
14 
15 
65 
29 
23 
933 
1040 
1100 
890 
596 
---
1100 
1100 
1100 
1100 
1100 
1100 
21 
21 
20 
20 
19 
---
27 
14 
13 
12 
12 
11 
19 
18 
15 
17 
14 
13 
17 
16 
16 
16 
15 
---
TOTAL 18072.7 
MEAN 
583 
MAX 
1390 
MIN 
9.0 
CFSM 
.00 
IN. 
.00 
AC-FT 
35850 
13480 
449 
1150 
11 
.00 
.00 
26740 
316.3 
10.2 
12 
9.1 
.00 
.00 
627 
300.1 
9.68 
18 
8.8 
.00 
.00 
595 
280.8 
10.0 
11 
9.0 
.00 
.00 
557 
484 
15.6 
65 
11 
.00 
.00 
960 
1
8378 
279 
1100 
14 
.00 
.00 
6620 
44448 
1434 
4300 
548 
.00 
.00 
88160 
4457 
149 
1100 
19 
.00 
.00 
8840 
538 
17.4 
27 
11 
.00 
.00 
1070 
1705 
55.0 
284 
11 
.00 
.00 
3380 
1443 
48.1 
190 
12 
.00 
.00 
2860 
CAL YR 1985 
WTR YR 1986 
TOTAL 
TOTAL 
45559.3 
93902.9 
MEAN 
MEAN 
125 
257 
MAX 
MAX 
1460 
4300 
MIN 
MIN 
7.7 
8.8 
CFSM 
CFSM 
.00 
.00 
IN. 
IN. 
.00 
.00 
AC-FT 
AC-FT 
90370 
186300 
 
 
         
 
    
 
     
         
 
 
  
 
           
 
 
 
 
          
          
 
 
 
 
  
 
         
           
         
          
 
 
           
 
        
 
 
 
 
     
         
 
 
          
         
         
 
     
 
     
          
 
   
     
   
61 
RIO GUAJATACA BASIN 
50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR--Continued 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1969 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLT- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
10... 
0900 E1050 
310 
8.00 
25.0 
5.3 
8.5 
100 
12 
220 
620 
DEC 
12... 
0945 E406 
473 7.40 24.0 1.6 
7.2 
82 <10 
66 600 
FEB 1986 
12... 
0940 
9.5 
581 
7.85 
24.0 
1.1 
6.0 
72 
<10 
74 
64 
APR 
29... 
1315 E650 
348 8.21 25.0 25 
8.4 101 
16 2800 4100 
JUL 
11... 
0905 
19 
510 
7.41 
25.0 
2.0 
5.9 
71 
14 
260 
300 
SEP 
12... 
0905 
18 
525 
7.31 
25.0 
1.6 
6.4 
78 
17 
K60 
K210 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD-
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS . 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
10... 
160 
8 
57 
3.1 
5.0 
0.2 
1.6 
147 
<0.5 
9.2 
7.4 
DEC 
12... 
205 
FEB 1986 
12... 
216 
APR 
29... 
150 
8 
54 
3.2 
5.5 
0.2 
1.8 
140 
<0.5 
11 
8.1 
JUL 
11... 
207 
--
SEP 
12... 
210 
19 
72 
7.1 
15 
0.5 
1.3 
190 
8.8 
25 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
10... 
0.10 
5.4 
180 
0.0 
10 
0.280 
0.020 
0.300 
0.140 
0.36 
DEC 
12... 
6 
1.99 
0.010 
2.00 
0.040 
0.36 
FEB 1986 
12... 
3 
2.48 
0.020 
2.50 
0.040 
0.56 
APR 
29... 
<0.10 
5.9 
170 
0.0 
31 
0.680 
0.020 
0.700 
0.050 
0.45 
JUL 
11... 
9 
<0.010 
2.00 
0.060 
0.14 
SEP 
12... 
0.10 
7.2 
250 
12 
4 
<0.010 
1.60 
0.060 
0.44 
E = estimate 
K = non-ideal count 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
RIO GUAJATACA BASIN 
50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRAD1LLAS, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
10... 
0.50 
0.80 
3.5 
0.020 
2 
<100 
20 
<1 
9 
10 
DEC 
12... 
0.40 
2.4 
11 
0.020 
FEB 1986 
12... 
0.60 
3.1 
14 
<0.010 
APR 
29... 
0.50 
1.2 
5.3 
0.050 
1 
<100 
30 
<1 
5 
10 
JUL 
11... 
0.20 
2.2 
9.7 
0.010 
SEP 
12... 
0.50 
2.1 
9.3 
0.010 
MALAGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- N1UM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
10... 
610 
2 
60 
0.20 
<1 
<1 
140 
<0.010 
3 
0.04 
DEC 
12... 
FEB 1986 
12... 
APR 
29... 
1300 
4 
80 
<0.10 
<1 
<1 
30 
<0.010 
<1 
0.05 
JUL 
11... 
SEP 
12... 
62 
  
 
 
 
 
 
 
63 
.
A T L A N 7w 
C 
OCEAN 
MAT ILLO 
CAMOY 
QUEBRADIL LAS 
20341. 
• 
ARECISO 
0157 
0148 
Drainage boundaries indeterminate 
in limestone terrane 
aBayaney 
River 
underground 
A 
rs, 
Limestone 
Igneous and 
L ARES 
sedimentary rocks 
• 
Rio Guaiatioca );‘
. 
basin 
: 
Rio Tonada 
Rio Grand. do 
•LITUADO 
Arecibo basin 
2 
Drainage boundary 
Masco basin \ 
Rio Grande de 
EXPLANATION 
A 0148 SURFACE—WATER STATION AND NUMBER 
• 203 WELL AND WELL NUMBER 
2 
45 KILOMETERS 
a 
I 
3 
4 
5 MILES 
Figure 12.--Rio Camuy basin. 
I
I
 
  
 
 
 
 
 
 
 
 
 
I
  
 
 
I 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
64 
RIO CAMUY BASIN 
50014800 RIO CAMUY NEAR BAYANEY, PR 
LOCATION .--Lat 18°23'48", long 66°49'04', Hydrologic Unit 21010002, on left bank at Highway 4R8, 1.4 mi (2.2 km) 
southeast of school at Santiago. 0.9 i (1.4 km) northwest from Escuela Manuel A. Rivera at Bayaney and 9.1 
i 
(14.6 km) upstream from Atlantic Ocean. 
DRAINAGE AREA.--Indeterminate. 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--May 1984 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 341 ft (104 m), from topographic map. 
REMARKS.--Estimated daily discharges: May 2-5 and Aug. 10 to Sept. 2. Records fair except those for estimated 
daily discharges, which are poor. 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 6,450 ft'is (183 m'/s), Oct. 7, 1985, gage height, 17.66 ft 
(5.383 m), from rating curve extended above 300 ft'is (8.50 10/s) on basis of step-backwater analysis; minimum 
discharge, 28 ft'/s (0.79 m 3 /s), Mar. 15-17, 1985. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft'/s (56.6 '/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(W/s) 
(10/s) 
(ft) 
(m) 
Date 
Time 
(ft'/s) 
(0/s) 
(ft) 
(m) 
Oct. 7 
0930 
*6.450 
183 
*17.66 5.383 
May 
5 
2015 
3,130 
88.6 
13.89 4.234 
Oct. 27 
2030 
2,400 
68.0 
12.38 3.773 
May 
6 
1900 
2,640 
74.8 
12.93 3.941 
Nov. 5 
2030 
2,160 
61.2 
11.82 3.603 
May 13 
1015 
2,830 
80.1 
13.34 4.066 
May 
1 
2015 
2,670 
75.6 
12.99 3.959 
May 14 
0115 
3,420 
9C.8 
14.30 4.359 
May 
2 
1645 
3,250 
92.0 
14.06 4.285 
Minimum discharge, 28 ft'is (0.79 '/s), Mar. 15-17. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
182 
174 
95 
55 
44 
32 
34 
776 
160 
63 
121 
150 
2 
151 
153 
92 
55 
39 
31 
34 
1360 
140 
61 
77 
600 
3 
90 
323 
90 
54 
57 
38 
61 
1700 
128 
60 
73 
435 
4 
79 
434 
88 
53 
104 
98 
169 
1300 
118 
59 
68 
388 
5 
73 
671 
87 
52 
61 
48 
356 
1160 
111 
58 
111 
157 
6 
783 
452 
87 
51 
50 
34 
130 
1490 
104 
60 
115 
110 
7 
3820 
321 
85 
51 
40 
32 
152 
1200 
104 
69 
75 
93 
8 
1320 
226 
83 
50 
38 
34 
266 
665 
164 
95 
82 
83 
9 
470 
179 
83 
53 
37 
32 
420 
739 
121 
61 
230 
77 
10 
339 
159 
81 
59 
37 
32 
358 
634 
203 
56 
700 
73 
11 
261 
143 
81 
54 
36 
31 
125 
470 
233 
60 
500 
68 
12 
495 
158 
79 
51 
34 
31 
77 
470 
140 
63 
120 
66 
13 
391 
143 
77 
50 
34 
30 
63 
1610 
117 
53 
87 
64 
14 
220 
151 
74 
49 
34 
29 
57 
1550 
101 
92 
84 
63 
15 
188 
473 
73 
48 
33 
29 
54 
579 
105 
103 
74 
61 
16 
157 
734 
70 
48 
34 
29 
50 
409 
102 
109 
70 
59 
17 
138 
514 
71 
47 
32 
179 
354 
304 
88 
75 
72 
58 
18 
133 
294 
68 
47 
34 
261 
588 
248 
141 
91 
68 
70 
19 
123 
213 
67 
46 
34 
96 
220 
210 
123 
65 
68 
61 
20 
112 
183 
67 
45 
70 
56 
113 
184 
103 
74 
66 
55 
21 
107 
179 
66 
44 
80 
42 
342 
161 
90 
88 
62 
54 
22 
103 
148 
63 
44 
48 
39 
295 
145 
85 
53 
62 
58 
23 
177 
137 
63 
43 
35 
37 
222 
132 
80 
60 
60 
60 
24 
237 
126 
61 
43 
33 
37 
187 
132 
77 
60 
62 
55 
25 
202 
119 
60 
43 
33 
37 
186 
125 
74 
65 
64 
54 
26 
498 
113 
60 
45 
33 
36 
94 
147 
76 
80 
60 
63 
27 
874 
107 
58 
40 
33 
46 
87 
214 
77 
123 
60 
55 
28 
674 
103 
57 
40 
32 
40 
233 
273 
74 
80 
80 
53 
29 
385 
99 
57 
44 
---
38 
359 
410 
68 
67 
70 
73 
30 
262 
98 
57 
41 
47 
384 
330 
65 
98 
78 
58 
31 
208 
---
55 
66 
37 
---
215 
---
113 
84 
---
TOTAL 
13252 
7327 
2255 
1511 
1209 
1618 
6070 
19342 
3372 
2324 
3603 
3374 
MEAN 
427 
244 
72.7 
48.7 
43.2 
52.2 
202 
624 
112 
75.0 
116 
112 
MAX 
3820 
734 
95 
66 
104 
261 
588 
1700 
233 
123 
700 
600 
MIN 
73 
98 
55 
40 
32 
29 
34 
125 
65 
53 
60 
53 
CFSM 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
IN. 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
AC-FT 
26290 
14530 
4470 
3000 
2400 
3210 
12040 
38360 
6690 
4610 
7150 
6690 
CAL YR 1985 TOTAL 
48669 
MEAN 
133 
MAX 
3820 
MIN 
31 
CFSM 
.00 
I. 
.00 
AC-FT 
96530 
WTR YR 1986 TOTAL 
65257 
MEAN 
179 
MAX 
3820 
MIN 
29 
CFSM 
.00 
IN. 
.00 
AC-FT 129400 
65 
RIO CAMUY BASIN 
50014800 RIO CAMUY NEAR BAYANEY, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.,-WATER YEARS JUNE 1984 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
DATE 
TIME 
INSTANTANEOUS 
DUCTANCE 
TURE 
DATE 
TIME 
INSTANTANEOUS 
DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
MAY, 19 1312 
211 
264 
24.0 
AUG, 04 1345 
69 
289 
25.0 
JUN, 12 1217 
•124 
266 
23.3 
SEP, 12 0959 
66 
332 
24.0 
JUL, 08 1139 
100 
263 
24.0 
I
I
I
I
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
66 
RIO CAMUY BASIN 
50015700 RIO CAMUY NEAR HATILLO, PR 
LOCATION.--Lat 18°27'44", long 66°49'56", Hydrologic Unit 21010002, 1.8 mi (2.9 km) southwest of Hatillo plaza, 
and 1.8 i (2.9 km) southeast of Caauy plaza. 1.2 mi (1.9 km) south of Planta de Purificacion, and 3.3 i 
(5.5 ka) upstream from Atlantic Ocean. 
DRAINAGE AREA.--Indeterminate. 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--June 1984 to current year. 
GAGE.--Wc.ter-stage recorder. Elevation of gage is 13 ft (4 ). from topographic map. 
REMARKS.--Estimated daily discharges: May 3-5, 8-19. Records fair except those for estimated daily discharges, 
which are poor. 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 10.500 ft,/s (297 a'/s), Oct. 7, 1985. gage height, 24.75 ft 
(7.544 a). from rating curve extended above 200 ft'is (5.66 m'/s) on basis of step-backwater analysis; 
minimum discharge, 36 ft'/s (1.02 '/s), Mar. 19. 1985. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1.800 fti/s (51.0 ma/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(W/s) 
(a/s) 
(ft) 
(a) 
Date 
Time 
(fts/s) 
(ie/s) 
(ft) 
(a) 
Oct. 7 
1315 
*10,500 
297 
*24.75 7.544 
Apr. 28 
2200 
2,800 
79.3 
15.40 4.694 
Oct. 12 
2315 
2,680 
75.9 
15.15 4.618 
Apr. 29 
2145 
3,340 
94.6 
16.44 5.011 
Oct. 26 
2330 
2,820 
79.9 
15.43 4.703 
May 
1 
2245 
5,680 
161 
20.00 6.096 
Oct. 27 
2345 
3.940 
112 
17.49 5.331 
May 
2 
1900 
8,420 
238 
22.94 6.992 
Oct. 28 
2230 
2,370 
67.1 
14.49 4.416 
May 
3 
2015 
6,840 
194 
21.33 6.501 
Nov. 5 
2300 
3,480 
98.6 
16.69 5.087 
May 
5 
2300 
6,600 
187 
21.06 6.419 
Nov. 6 
2015 
2,170 
61.4 
14.05 4.282 
May 
6 
2145 
6,510 
184 
20.96 6.389 
Nov. 16 
0030 
3.430 
97.1 
16.60 5.060 
May 
13 
1245 
6,810 
193 
21.30 6.492 
Mar. 17 
2330 
2,250 
64.0 
14.24 4.340 
May 
14 
0145 
7,750 
214 
22.08 6.730 
Apr. 9 
2330 
3,620 
102 
16.94 5.163 
Aug 
10 
2215 
3,240 
91.8 
16.24 4.950 
Apr. 18 
0115 
3,100 
87.8 
15.99 4.874 
Nov. 
3 
2215 
2,250 
63.7 
14.23 4.337 
Minimum discharge, 47 ft'is (1.33 m'/s), Mar. 27. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
273 
201 
122 
67 
56 
55 
51 
1570 
201 
90 
133 
186 
2 
419 
189 
118 
67 
50 
55 
50 
3900 
176 
87 
92 
438 
3 
130 
351 
114 
66 
62 
56 
51 
5280 
162 
85 
87 
550 
4 
107 
778 
113 
65 
162 
131 
185 
3000 
151 
83 
83 
688 
5 
100 
1100 
110 
64 
95 
81 
702 
2500 
142 
83 
100 
179 
6 
928 
1270 
109 
61 
80 
64 
185 
4120 
134 
84 
124 
124 
7 
8150 
709 
105 
61 
69 
60 
284 
4050 
129 
86 
88 
108 
8 
2900 
296 
101 
60 
66 
59 
578 
1700 
176 
114 
89 
98 
9 
940 
211 
100 
65 
64 
57 
841 
2000 
167 
85 
244 
91 
10 
556 
188 
98 
69 
62 
57 
1220 
1500 
207 
80 
868 
87 
11 
324 
174 
97 
63 
62 
56 
206 
1000 
299 
78 
728 
84 
12 
514 
184 
96 
59 
59 
56 
121 
900 
164 
88 
143 
81 
13 
739 
203 
92 
58 
59 
54 
100 
5060 
148 
77 
107 
80 
14 
255 
174 
90 
57 
58 
54 
88 
5460 
129 
95 
103 
79 
15 
216 
982 
89 
56 
58 
52 
82 
1500 
125 
123 
93 
76 
16 
187 
2220 
87 
56 
59 
52 
78 
700 
133 
130 
86 
74 
17 
167 
1210 
86 
57 
57 
233 
241 
450 
116 
90 
89 
73 
18 
160 
522 
85 
55 
59 
586 
1200 
350 
129 
107 
82 
81 
19 
154 
320 
83 
54 
57 
110 
409 
300 
182 
86 
83 
75 
20 
143 
252 
82 
53 
89 
70 
277 
292 
121 
83 
79 
70 
21 
137 
243 
80 
52 
122 
58 
691 
257 
118 
109 
75 
70 
22 
134 
202 
79 
52 
78 
53 
562 
231 
109 
84 
73 
72 
23 
151 
179 
77 
51 
67 
50 
312 
206 
114 
80 
72 
75 
24 
388 
165 
76 
51 
61 
48 
247 
186 
106 
79 
74 
71 
25 
240 
156 
75 
50 
60 
49 
249 
195 
101 
85 
76 
69 
26 
575 
148 
73 
52 
59 
50 
138 
187 
98 
87 
71 
75 
27 
1300 
141 
73 
49 
58 
60 
129 
310 
103 
127 
70 
71 
28 
1320 
136 
71 
49 
57 
90 
571 
441 
101 
97 
99 
66 
29 
648 
130 
70 
52 
---
79 
1340 
678 
95 
86 
86 
82 
30 
303 
126 
69 
50 
67 
1130 
556 
92 
108 
97 
73 
31 
235 
---
68 
66 
56 
---
275 
---
133 
103 
---
TOTAL 
22793 
13160 
2788 
1787 
1945 
2658 
12318 
49154 
4228 
2909 
4397 
4046 
MEAN 
735 
439 
89.9 
57.6 
69.5 
85.7 
411 
1586 
141 
93.8 
142 
135 
MAX 
8150 
2220 
122 
69 
162 
586 
1340 
5460 
299 
133 
868 
688 
MIN 
100 
126 
68 
49 
50 
48 
50 
186 
92 
77 
70 
66 
CFSM 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
IN. 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
AC-FT 
45210 
26100 
5530 
3540 
3860 
5270 
24430 
97500 
8390 
5770 
8720 
8030 
.00 
IN. 
.00 
AC-FT 145400 
WTR YR 1986 TOTAL 122183 
MEAN 
335 
MAX 
8150 
MIN 
48 
CFSM 
.00 
CAL YR 1985 TOTAL 
73305 
MEAN 
201 
MAX 
8150 
MIN 
39 
CFSM 
IN. 
.00 
AC-FT 242300 
67 
RIO CAMUY BASIN 
50015700 RIO CAMUY NEAR HATILLO, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS AUGUST 1984 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
DATE 
TIME 
INSTANTANEOUS 
DUCTANCE 
TURE 
DATE 
TIME 
INSTANTANEOUS 
DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
NOV, 12 1118 
160 
299 
23.5 
JUL, 08 0852 
130 
303 
23.5 
DEC, 10 1047 
98 
307 
23.0 
AUG, 04 1029 
83 
324 
24.0 
JUN. 12 0853 
159 
295 
23.0 
SEP, 02 1044 
145 
295 
24.0 
I 
 
 
 
 
 
69 
HATILLO 
ARECI 
BARCELONE TA 
0135 
Bayaney 
Drainage boundaries indeterminate 
in limestone terrane 
Li mestone 
Igneous and 
mentory rock's 
`0280 
Rib Comuy 
basin 
R,a Grand* di 
AEnsca basin 
RiRo Guayonillo 
basin 
--Map area 
6AJA6tB0 
UTUADO 
LOCO Viv 
Logo 
Poliojos 
Logo 
Artjuntos 
0205 
ADJUNTAS 
Ftio Partu 
basin 
Rio TMlobo° 
basin 
4 
FIanda
S 
JAY YA 
Ft;:z, intiborl
ucon.dt›,in 
basin 
EXPLANATION 
A 0284 SURFACE—WATER STATION AND NUMBER 
0205 QUALITY—OF—WATER STATION AND NUMBER 
025110 QUALITY—OF—WATER PARTIAL RECORD 
STATION AND NUMBER 
• 135 WELL AND WELL NUMBER 
5 KILOMETERS 
5 MILES 
Figure 13.--Rio Grande de Arecibo basin. 
 
 
         
 
    
 
     
  
      
       
  
          
           
 
 
  
           
 
 
 
 
 
  
 
         
           
         
           
 
 
           
 
         
 
 
 
 
 
 
     
 
         
 
 
 
          
         
          
 
    
 
     
          
     
          
70 
RIO GRANDE DE ARECIBO BASIN 
50020500 RIO GRANDE DE ARECIBO NEAR ADJUNTAS, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°10'54", long 66°44'12", at Highway 135 bridge, 1.0 mi (1.6 km) upstream from Lago Adjuntas, and 
1.5 mi (2.4 km) northwest of Adjuntas plaza. 
DRAINAGE AREA.--12.7 sq mi (32.9 sq km) this does not include 6.0 sq mi (15.6 sq k,i) above Lago Garzas. 
PERIOD OF RECORD.--Water years 1969-74, 1979 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
30... 
1540 
90 
7.20 
21.5 
230 
9.0 
105 
49 
DEC 
17... 
0800 
25 
280 
7.80 
19.0 
1.0 
<10 
<30 
5800 
FEB 1986 
19... 
0830 
12 
337 
8.05 
18.5 
1.0 
9.1 
103 
32 
26000 
42000 
MAY 
07... 
0835 
35 
332 
7.80 
21.5 
50 
7.9 
94 
21 
2400 
K14000 
JUL 
18... 
0835 13 
326 7.80 22.5 13 
7.8 
94 <10 K10000 K15000 
SEP 
18... 
0805 
12 
370 
7.68 
21.0 
1.2 
7.6 
90 
26 
310 
300 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD-
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE 01S- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
iS SO4) 
AS CL) 
OCT 1985 
30... 
35 
2 
9.0 
3.0 
5.3 
0.4 
1.4 
33 
<0.5 
8.8 
5.4 
DEC 
17... 
101 
FEB 1986 
19... 
106 
MAY 
07... 
85 
6 
21 
7.8 
16 
0.8 
2.3 
79 
<0.5 
9.9 
19 
JUL 
18... 
107 
SEP 
18... 
120 
2 
31 
10 
21 
0.9 
2.2 
117 
9.9 
27 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/i 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
30... 
<0.10 
14 
67 
0.0 
780 
0.460 
0.040 
0.500 
0.080 
0.82 
DEC 
17... 
1 
1.44 
0.060 
1.50 
0.060 
FEB 1986 
19... 
7 
0.900 
0.100 
1.00 
0.070 
0.43 
MAY 
07... 
<0.10 
26 
150 
14 
72 
1.16 
0.040 
1.20 
0.170 
0.43 
JUL 
18... 
8 
0.950 
0.050 
1.00 
0.150 
1.1 
SEP 
18... 
0.10 
30 
200 
6.7 
2 
0.950 
0.050 
1.00 
0.050 
0.35 
K = non-ideal count 
 
 
    
    
 
          
         
 
    
  
        
          
        
         
 
   
   
 
 
71 
RIO GRANDE DE ARECIBO BASIN 
50020500 RIO GRANDE DE ARECIBO NR ADJUNTAS, PR--Continued 
WATER QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
30.., 
0.90 
1.4 
6.2 
0.140 
<1 
100 
30 
<1 
45 
50 
DEC 
17... 
<0.20 
0.120 
FEB 1986 
19... 
0.50 
1.5 
6.6 
0.160 
MAY 
07... 
0.60 
1.8 
8.0 
0.110 
<1 
100 
20 
<1 
6 
10 
JUL 
18... 
1.3 
2.3 
10 
0.140 
SEP 
18... 
0.40 
1.4 
6.2 
0.160 
--
MANGA-
METHY-
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELF-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
30... 
31000 
35 
1000 
0.10 
<1 
<1 
110 
<0.010 
<1 
DEC 
17... 
FEB 1986 
19... 
MAY 
07... 
2600 
1 
120 <0.10 
<1 
<1 
30 <0.010 
1 0.05 
JUL 
18... 
SEP 
18... 
I 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO GRANDE DE ARECIBO BASIN 
50025000 RIO GRANDE DE ARECIBO NEAR UTUADO, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°18'11", long 66°41'59", at bridge near Highway 10 at km 56.4, 0.5 mi (0.8 km) downstream from 
Rio de Caguana, and 2.5 mi (4.0 km) north of Utuado plaza. 
DRAINAGE AREA.--66.0 sq mi (170.9 sq km) this excludes 6.0 sq mi (15.5 sq km) upstream fro
Lago Garzas, which is 
a diversion to Rio Guayanes in the Rio Tallaboa basin. 
PERIOD OF RECORD.--Water years 1959-74, 1979 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
!TY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
10G ML) 100 ML) 
OCT 1985 
29... 
1500 
536 
165 
7.60 
25.5 
80 
15 
21000 
7500 
DEC 
16... 
1430 
107 
262 
7.80 
27.0 
5.4 
<10 
52000 
5600 
FEB 1986 
18... 
1610 
39 
265 
8.10 
26.5 
6.2 
7.2 
91 
22 
K16000 
4900 
MAY 
06... 
1440 
165 
198 
7.65 
26.0 
90 
7.6 
94 
13 
24000 
1000 
JUL 
17... 
1410 
82 
266 
7.80 
27.5 
10 
7.3 
93 
<10 
24000 
3200 
SEP 
17... 
1425 
35 
290 
7.88 
33.0 
7.0 
7.2 
102 
34 
3000 
320 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD- 
S1UM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- D1S- TOTAL SULFIDE DIS- DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
29... 
53 
0 
13 
5.0 
8.5 
0.5 
2.4 
55 
<0.5 
18 
8.1 
DEC 
16... 
89 
FEB 1986 
18... 
80 
MAY 
06... 
75 
69 
20 
6.2 
10 
0.5 
2.2 
7 
<0,5 
22 
8.7 
JUL 
17... 
75 
SEP 
17... 
98 
13 
27 
7.4 
14 
0.6 
3.2 
85 
22 
13 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
29... 
<0.10 
20 
110 
156 
189 
1.07 
0.030 
1.10 
0.070 
0.33 
DEC 
16... 
- 
2 
1.37 
0.030 
1.40 
0.050 
FEB 1986 
18... 
15 
1.25 
0.050 
1.30 
0.030 
0.57 
MAY 
06... 
<0.10 
24 
97 
43 
176 
1.18 
0.020 
1.20 
0.100 
0.60 
JUL 
17... 
68 
1.07 
0.030 
1.10 
0.020 
0.38 
SEP 
17... 
0.20 
29 
170 
16 
11 
1.05 
0.050 
1.10 
0.030 
0.37 
K . non-ideal count 
72 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
73 
RIO GRANDE DE ARECIBO BASIN 
50025000 RIO GRANDE DE ARECIBO NEAR UTUADO, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MUNIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
29... 
0.40 
1.5 
6.6 
0.120 
<1 
100 
20 
1 
21 
60 
DEC 
16... 
<0.20 
0.150 
- 
FEB 1986 
18... 
0.60 
1.9 
8.4 
0.190 
MAY 
06... 
0.70 
1.9 
8.4 
0.140 
<1 
200 
30 
<1 
8 
40 
JUL 
17... 
0.40 
1.5 
6.6 
0.130 
-- 
SEP 
17... 
0.40 
1.5 
6.6 
0.210 
MANGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
29 .. 
11000 
7 
480 
<0.10 
<1 
<1 
60 
<0.010 
<1 
0.05 
DEC 
16... 
FEB 1986 
18... 
MAY 
06... 
8900 
<1 400 <0.10 
<1 
<1 
60 <0.010 
1 0.05 
JUL 
17... 
SEP 
17... 
I
I 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
 
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO GRANDE DE ARECIBO BASIN 
50026050 RIO CAONILLAS ABOVE LAGO CAONILLAS NEAR JAYUYA, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°13'26", long 66°38'22", 300 ft (91 ) off Highway 531, 700 ft (213 a) upstreaa fro
Lago 
Caonillas, 3.3 mi (5.3 km) northwest of Jayuya plaza. 
DRAINAGE AREA.--40.4 sq ai (104.6 sq ka). 
PERIOD OF RECORD.--Water years 1979 to current year. 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
018- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- D1S- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) (US/CM) UNITS) (DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
30... 
1025 
125 
7.60 
23.0 
50 
14 
K7500 
3400 
DEC 
17... 
1200 
66 
208 
8.10 
23.0 
9.0 
<10 
K640 
K130 
FEB 1986 
19... 
1310 
36 
248 
8.65 
20.0 
3.0 
9.4 
107 
20 
550 
350 
MAY 
07... 
1220 
207 
7.80 
24.0 
80 
8.2 
100 
31 
5600 
5000 
JUL 
18... 
1150 
36 
223 
7.80 
27.5 
76 
7.9 
102 
22 
K7700 
K2800 
SEP 
18... 
1205 
29 
232 
7.54 
26.5 
0.70 
7.8 
100 
30 
K7500 
3400 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- UNITY 
CHLO- 
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD- 
SIUM, WATER 
SULFATE RIDE, 
NESS 
WATER 
DIS- 
DIS- 
DIS- 
SORP- 
DIS- 
TOTAL 
SULFIDE 
DIS- 
DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
LION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
30... 
46 
6 
12 
4.0 
8.1 
0.5 
1.8 
40 
<0.5 
11 
6.4 
DEC 
17... 
-- 
71 
FEB 1986 
19... 
79 
MAY 
07... 
44 
4 
11 
3.9 
8.0 
0.5 
1.7 
40 
<0.5 
11 
7.8 
JUL 
18... 
72 
SEP 
18... 
73 
7 
19 
6.2 
11 
0.6 
2.1 
66 
16 
11 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS ti) 
AS N) 
OCT 1985 
30... 
0.10 
22 
89 
0.0 
125 
0.020 
<0.100 
0.060 
0.34 
DEC 
17... 
19 
0.890 
0.010 
0.900 
0.030 
0.27 
FEB 1986 
19... 
9 
<0.010 
0.500 
0.030 
0.37 
MAY 
07... 
0.10 
21 
88 
0.0 
104 
1.08 
0.020 
1.10 
0.040 
0.66 
JUL 
18... 
119 
0.570 
0.030 
0.600 
0.060 
0.44 
SEP 
18... 
0.10 
21 
130 
10 
152 
0.580 
0.020 
0.600 
0.060 
0.24 
K = non-ideal count 
74 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
RIO GRANDE DE ARECIBO BASIN 
50026050 RIO CAONILLAS ABOVE LAGO CAONILLAS NEAR JAYUYA, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA t 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS H) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
30... 
0.40 
0.080 
<1 
100 
30 
1 
10 
40 
DEC 
17... 
0.30 
1.2 
5.3 
0.070 
FEB 1986 
19... 
0.40 
0.90 
4.0 
0.050 
MAY 
07... 
0.70 
1.8 
8.0 
0.120 
<1 
100 
20 
<1 
12 
30 
JUL 
18... 
0.50 
1.1 
4.9 
0.180 
SEP 
18... 
0.30 
0.90 
4.0 
0.110 
MANGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ENABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PO) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
30... 
8400 
2 
250 
<0.10 
<1 
<1 
50 
<0.010 
<1 
0.04 
DEC 
17... 
FEB 1986 
19... 
MAY 
07... 
2000 
2 
250 
<0.10 
<1 
<1 
20 
<0.010 
3 
0.04 
JUL 
18...
-- 
SEP 
18... 
75 
 
 
         
 
    
 
      
 
 
 
 
  
 
         
           
         
 
 
 
     
         
 
 
          
         
 
 
 
76 
RIO GRANDE DE ARECIBO BASIN 
50027250 RIO GRANDE DE ARECIBO BELOW LAGO DOS BOCAS NEAR FLORIDA, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°20'50", long 66°40'02", at pedestrian bridge, 0.7 mi (1.1 km) downstream from Lago Dos Bocas 
and 6.6 mi (10.6 km) west of Florida plaza. 
DRAINAGE AREA.--169 sq mi (436 sq km) does not include 6.0 sq mi (15.6 sq km) above Lago Garzas. 
PERIOD OF RECORD.--Water years 1970-71, 1974 to current year. 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) 
(MG/L) 
100 ML) 100 ML) 
OCT 1985 
29... 
1130 
141 
7.40 
24.5 
280 
22 
3500 
28000 
DEC 
16... 
1220 
199 
7.40 
24.0 
4.5 
<10 
38 
K20 
FEB 1986 
18... 
1345 
113 
198 
7.75 
25.0 
2.4 
5.5 
67 
39 
K10 
K16 
MAY 
06... 
1015 
148 
7.38 
24.0 
200 
6.5 
77 
21 
K1500 
9300 
JUL 
17... 
1020 
199 
7.15 
26.5 
4.0 
3.4 
42 
25 
K45 
K20 
SEP 
17... 
1115 
247 
7.15 
27.5 
3.0 
3.7 
47 
84 
K18 
<10 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD-
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
29... 
55 
7 
15 
4.3 
8.3 
0.5 
2.3 
48 
<0.5 
17 
8.0 
DEC 
16... 
69 
FEB 1986 
18... 
67 
MAY 
06... 
48 
5 
13 
3.7 
7.1 
0.5 
2.2 
43 
<0.5 
9.8 
7.7 
JUL 
17... 
71 
SEP 
17... 
82 
2 
22 
6.5 
11 
0.5 
2.2 
80 
15 
10 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
29... 
<0.10 
19 
100 
0.0 
298 
0.740 
0.060 
0.800 
0.100 
0.70 
DEC 
16... 
2 
<0.010 
0.800 
0.020 
0.28 
FEB 1986 
18... 
5 
0.490 
0.010 
0.500 
0.040 
0.36 
MAY 
06... 
0.10 
17 
86 
0.0 
200 
0.760 
0.040 
0.800 
0.100 
0.60 
JUL 
17... 
5 
0.180 
0.020 
0.200 
0.180 
0.42 
SEP 
17... 
0.10 
23 
140 
0.0 
2 
<0.010 
0.100 
0.140 
0.36 
K = non-ideal count 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
  
 
  
 
  
 
RIO GRANDE DE ARECIBO BASIN 
50027250 RIO GRANDE DE ARECIBO BELOW LAGO DOS BOCAS NEAR. FLORIDA, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PROS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE 
ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
29... 
0.80 
1.6 
7.1 
0.140 
<1 
100 
50 
<1 
23 
50 
DEC 
16... 
0.30 
1.1 
4.9 
0.030 
FEB 1986 
18... 
0.40 
0.90 
4.0 
0.020 
-- 
MAY 
06... 
0.70 
1.5 
6.6 
0.080 
1 
100 
20 
<1 
15 
20 
JUL 
17... 
0.60 
0.80 
3.5 
0.020 
SEP 
17... 
0.50 
0.60 
2.7 
0.030 
MANGA- 
METHY- 
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB 
DATE 
'(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CM) (UG/L) 
(MG/L) 
OCT 1985 
29... 
13000 
3 300 <0.10 
<1 
<1 
70 <0.010 
<1 0.04 
DEC 
16... 
FEB 1986 
18... 
MAY 
06... 
12000 
2 240 <0.10 
<1 
<1 
30 <0.010 
<1 0.08 
JUL 
17... 
SEP 
17... 
77 
I
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I 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
78 
RIO GRANDE DE ARECIBO BASIN 
50027750 RIO GRANDE OE ARECIBO ABOVE ARECIBO, PR 
LOCATION.--Lat 18'25'29", long 66'41'44", Hydrologic Unit 21010002, 0.8 i (1.3 km) upstream from Rio Tanama, 
4.0 i (6.4 km) south of Arecibo and 6.7 mi (10.8 km) above mouth, and 10.2 mi (16.4 km) downstream from 
Lago Dos Bocas. 
DRAINAGE AREA.--200 mi' (520 km 2 ), approximately, of which an undetermined amount does not contribute 
directly to surface runoff. 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--April 1982 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 30 ft (9 m), fro topographic map. 
REMARKS.--Estimated daily discharges: Oct. 7 to Nov. 15. Records fair except those for estimated daily 
discharges, which are poor. Flow regulated by Lago Dos Bocas Dam 10.2 mi (16.4 km) upstream. 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 45,800 ft'/s (1,300 '/s), May 18, 1985, gage height, 
18.22 ft (5.553 ), from floodmark, from rating curve extended above 2,400 ft'/s (68.0 '/s) on basis of 
slope-area measurement of peak flow; minimum discharge, 30 ft'/s (0.850 m'/s), Mar. 30, 1986. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,300 ft'is (122 '/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft'/s) 
(10/s) 
(ft) 
(m) 
Date 
Time 
(ft7s) (e/s) 
(ft) 
(m) 
Oct. 7 
0900 
*41,200 
1,167 
*17.85 5.441 
May 13 
1230 
9,470 
268 
12.90 3.932 
May 
1 
2215 
5,520 
156 
10.67 3.252 
May 14 
0115 
25,900 
733 
16.31 4.971 
May 
2 
2030 
4,320 
122 
9.51 2.899 
Minimum discharge, 30 ft'/s (0.850 
3/s), Mar. 30. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
209 
1570 
682 
152 
215 
86 
380 
2410 
1070 
57 
941 
65 
2 
695 
2530 
891 
322 
64 
223 
234 
2930 
946 
53 
218 
796 
3 
142 
2400 
305 
818 
639 
370 
309 
2130 
975 
194 
444 
709 
4 
467 
630 
530 
416 
301 
166 
559 
1770 
969 
59 
90 
179 
5 
122 
1670 
271 
95 
232 
67 
473 
1850 
828 
125 
186 
259 
6 
1630 
2530 
257 
60 
374 
148 
636 
2060 
852 
73 
558 
92 
7 
12900 
2170 
633 
55 
180 
314 
689 
1960 
305 
610 
377 
723 
8 
3500 
2150 
438 
186 
122 
85 
802 
1960 
574 
108 
368 
741 
9 
3000 
800 
936 
86 
49 
47 
789 
1880 
881 
301 
79 
98 
10 
2470 
1130 
530 
47 
169 
261 
862 
1840 
946 
234 
104 
193 
11 
2420 
1900 
637 
108 
436 
404 
568 
1530 
971 
491 
620 
229 
12 
2360 
1900 
275 
70 
510 
427 
431 
436 
950 
99 
930 
598 
13 
2230 
1870 
511 
562 
419 
420 
220 
4670 
927 
59 
618 
109 
14 
2180 
1410 
419 
134 
326 
428 
410 
10700 
571 
443 
322 
58 
15 
1480 
1540 
438 
127 
149 
338 
416 
3050 
229 
338 
190 
720 
16 
2530 
2530 
542 
203 
82 
113 
69 
2010 
698 
514 
73 
624 
17 
2270 
2000 
315 
176 
127 
362 
364 
1790 
663 
500 
53 
453 
18 
1670 
1850 
423 
404 
410 
344 
1120 
1740 
1160 
661 
90 
526 
19 
1630 
1110 
236 
157 
466 
364 
1370 
1700 
881 
167 
49 
163 
20 
1500 
986 
288 
538 
448 
347 
1220 
1360 
684 
63 
98 
58 
21 
755 
1210 
190 
246 
406 
273 
1260 
1020 
464 
172 
73 
53 
22 
1060 
866 
159 
130 
101 
73 
458 
933 
99 
457 
48 
121 
23 
430 
557 
370 
60 
124 
63 
447 
1320 
206 
876 
45 
114 
24 
1140 
648 
177 
55 
374 
347 
503 
1250 
561 
758 
46 
240 
25 
810 
958 
150 
88 
459 
338 
435 
897 
722 
115 
45 
471 
26 
1700 
889 
139 
226 
331 
347 
357 
1100 
739 
109 
195 
483 
27 
1800 
750 
153 
378 
325 
202 
179 
1130 
112 
194 
67 
88 
28 
1670 
425 
126 
201 
308 
50 
731 
989 
69 
60 
494 
53 
29 
2530 
670 
77 
239 
---
47 
770 
1240 
241 
530 
553 
78 
30 
2530 
739 
87 
337 
42 
1460 
1360 
62 
889 
463 
56 
31 
1670 
---
620 
408 
323 
---
981 
---
966 
119 
---
TOTAL 
61500 
42388 
11805 
7084 
8146 
7419 
18521 
61996 
19355 
10275 
8556 
9150 
MEAN 
1984 
1413 
381 
229 
291 
239 
617 
2000 
645 
331 
276 
305 
MAX 
12900 
2530 
936 
818 
639 
428 
1460 
10700 
1160 
966 
941 
796 
MIN 
122 
425 
77 
47 
49 
42 
69 
436 
62 
53 
45 
53 
CFSM 
9.92 
7.06 
1.90 
1.14 
1.45 
1.19 
3.08 
10.0 
3.22 
1.65 
1.38 
1.52 
IN. 
11.44 
7.88 
2.20 
1.32 
1.52 
1.38 
3.44 
11.53 
3.60 
1.91 
1.59 
1.70 
AC-FT 122000 
84080 
23420 
14050 
16160 
14720 
36740 
123000 
38390 
20380 
16970 
18150 
CAL YR 1985 TOTAL 249008 
MEAN 
682 
MAX 
14800 
MIN 
40 
CFSM 3.41 
IN. 
46.32 
AC-FT 493900 
WTR YR 1986 TOTAL 266195 
MEAN 
729 
MAX 
12900 
MIN 
42 
CFSM 3.64 
IN. 
49.51 
AC-FT 528000 
79 
RIO GRANDE DE ARECIBO BASIN 
50027750 RIO GRANDE DE ARECIBO ABOVE ARECIBO, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS APRIL 1982 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
DATE 
TIME 
INSTANTANEOUS 
DUCTANCE 
TURE 
DATE 
TIME 
INSTANTANEOUS 
DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
OCT, 01 1100 
114 
231 
25.5 
JUL, 10 1000 
78 
254 
27.0 
NOV, 14 1204 
222 
225 
25.0 
AUG, 12 1045 
120 
254 
27.0 
DEC, 12 1109 
122 
246 
23.5 
SEP, 12 1022 
130 
251 
26.5 
JUN, 16 1009 
126 
225 
25.5 
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80 
RIO GRANDE DE ARECIBO BASIN 
50028000 RIO TANAMA NEAR UTUADO, PR 
LOCATION.--Lat 18'18'02", long 66°46'58'. Hydrologic Unit 21010001, on downstream side of left abutment of bridge 
on Highway 111, 1.2 i (1.9 km) upstream fro natural tunnel, 1.5 •i (2.4 km) northeast of Angeles. and 5.8 mi 
(9.3 km) northwest of Utuado. 
DRAINAGE AREA.--18.4 i' (47.7 km'). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--June 1944 to June 1958 (daily stage and two to four measurements per month by Puerto Rico Water 
Resources Authority), November 1959 to current year. 
GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 938.32 ft (286.00 m) above mean sea level. 
Datum of gage was lowered 3.00 ft (0.914 m) on Oct. 1978. Prior to Nov. 1/, 1966, non-recording gage and 
Nov. 17, 1966 to Sept. 30, 1978 recording gage, both at present site. 
REMARKS.--Estimated daily discharges: Oct. 9, 10, Oct. 29 to Nov. 1, Nov. 8-14. Apr. 21-25. May 5-19. 
Records fair except those for estimated daily discharges, which are poor. 
AVERAGE DISCHARGE.--26 years (1961-86). 49.1 ft'/s (1.390 '/s), 36.24 in/yr (920 mm/yr), 35,570 acre-ft/yr 
(43.8 hm'/yr); median of yearly mean discharges, 48 ft'/s (1.36 '/s), 34,800 acre-ft/yr (43 h•'/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge. 12.190 ft'/s (345 '/s), May 18, 1985, gage height, 17.45 ft 
(5.319 m) new datum in use, fro floodmark and recorder, from rating curve extended above 500 ft'/s (14.2 m'/s) 
on basis of slope-area measurement of peak flow; minimum discharge, 6.6 ft'/s (0.187 '/s), June 12, 1977. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 ft'/s (85.0 '/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft'/s) 
(e/s) 
(ft) 
(m) 
Date 
Time 
(ft'/s) 
(e/s) 
(ft) 
(m) 
Oct. 6 
1730 
4,580 
130 
13.64 4.157 
Apr. 30 
1745 
4,410 
125 
13.45 4.100 
Oct. 7 
0645 
*7.840 
222 
*15.69 4.782 
May 
1 
1630 
3,070 
86.9 
11.77 3.587 
Minimum discharge, 14 ft'is (0.396 m'/s), Mar. 14-16, 22-24, 27. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTENBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
54 
115 
64 
33 
24 
19 
17 
352 
87 
41 
41 
68 
2 
39 
107 
63 
33 
27 
18 
16 
308 
81 
41 
36 
43 
3 
34 
128 
62 
32 
77 
19 
83 
256 
78 
40 
35 
35 
4 
32 
123 
61 
31 
49 
19 
46 
263 
75 
3q 
44 
33 
5 
34 
199 
60 
30 
33 
18 
141 
210 
72 
40 
46 
30 
6 
388 
124 
58 
30 
29 
17 
39 
190 
68 
43 
35 
28 
7 
1510 
103 
56 
30 
27 
17 
25 
240 
88 
41 
126 
27 
8 
381 
90 
54 
29 
25 
17 
58 
200 
92 
40 
57 
27 
9 
200 
80 
53 
36 
24 
16 
66 
170 
72 
38 
48 
27 
10 
140 
75 
52 
34 
24 
15 
34 
150 
92 
36 
51 
26 
11 
114 
75 
52 
29 
24 
16 
25 
150 
75 
45 
52 
25 
12 
193 
80 
51 
27 
23 
16 
22 
140 
82 
39 
36 
25 
13 
103 
85 
48 
27 
23 
16 
21 
330 
73 
::6 
41 
25 
14 
119 
115 
46 
26 
23 
15 
20 
440 
64 
55 
36 
24 
15 
102 
193 
46 
26 
22 
15 
22 
200 
129 
60 
33 
22 
16 
81 
224 
45 
26 
21 
15 
65 
150 
72 
56 
30 
22 
17 
70 
164 
44 
27 
23 
16 
146 
120 
60 
98 
30 
25 
18 
69 
135 
43 
26 
22 
22 
185 
110 
80 
59 
30 
26 
19 
63 
107 
42 
25 
21 
21 
79 
100 
58 
43 
30 
23 
20 
60 
100 
41 
25 
24 
16 
92 
88 
52 
61 
30 
22 
21 
74 
101 
40 
24 
22 
16 
85 
78 
50 
59 
28 
22 
22 
61 
88 
40 
27 
20 
14 
35 
73 
48 
44 
29 
28 
23 
154 
84 
39 
25 
19 
14 
30 
68 
47 
42 
34 
25 
24 
101 
80 
38 
25 
19 
15 
30 
92 
47 
47 
33 
24 
25 
78 
77 
37 
39 
20 
17 
25 
72 
46 
43 
40 
26 
26 
167 
74 
36 
34 
19 
16 
27 
68 
47 
41 
40 
23 
27 
322 
72 
35 
23 
19 
17 
25 
68 
47 
43 
29 
21 
28 
292 
69 
35 
25 
19 
16 
30 
96 
44 
42 
36 
30 
29 
170 
67 
34 
26 
---
16 
62 
183 
43 
40 
60 
25 
30 
155 
65 
34 
56 
16 
445 
114 
42 
4I' 
57 
22 
31 
130 
---
33 
29 
15 
---
94 
---
44 
39 
---
TOTAL 
5490 
3199 
1442 
915 
722 
515 
1996 
5173 
2011 
1437 
1292 
829 
MEAN 
177 
107 
46.5 
29.5 
25.8 
16.6 
66.5 
167 
67.0 
46.4 
41.7 
27.6 
MAX 
1510 
224 
64 
56 
77 
22 
445 
440 
129 
S8 
126 
68 
MIN 
32 
65 
33 
23 
19 
14 
16 
68 
42 
35 
28 
21 
CFSM 
9.62 
5.82 
2.53 
1.60 
1.40 
.90 
3.61 
9.08 
3.64 
2.52 
2.27 
1.50 
IN. 
11.10 
6.47 
2.92 
1.85 
1.46 
1.04 
4.04 
10.46 
4.07 
2.91 
2.61 
1.68 
AC-FT 
10890 
6350 
2860 
1810 
1430 
1020 
3960 
10260 
3990 
2850 
2560 
1640 
CAL YR 1985 TOTAL 
22815 
MEAN 
62.5 
MAX 1890 
MIN 
17 
CFSM 3.40 
IN. 
46.13 
AC-FT 
45250 
WTR YR 1986 TOTAL 
25021 
MEAN 
68.6 
MAX 1510 
MIN 
14 
CFSM 3.73 
IN. 
50.59 
AC-FT 
49630 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
RIO GRANDE DE ARECIBO BASIN 
50028000 RIO TANAMA NEAR UTUADO, PR--Continued 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1958 to current year. 
PERIOD OF DAILY RECORD.-- 
SUSPENDED SEDIMENT DISCHARGE: January 1968 to current year. 
REMARKS.--Sediment samples were collected by a local observer on a weekly basis and during high flow events. 
Estimates for period of missing daily record were made from a sediment transport curve developed from a 
period of record over 5 years. 
EXTREMES FOP PERIOD OF DAILY RECORD.-- 
SEDIMENT Cuh,:r.NTRATIONS: Maximum daily mean, 20,400 mg/L November 27, 1968; minimum daily mean, 0 mg/L during 
water year 1985. 
SEDIMENT LOADS: Maximum daily, 167,000 tons (152,000 tonnes) May 18, 1985, minimum daily, 0.0 ton (0.0 tonne) 
during many years. 
EXTREMES FOR CURRENT YEAR.-- 
SEDIMENT CONCENTRATIONS: Maximum daily mean, 9,340 mg/L October 07, 1985; minimum daily mean, 
5.0 mg/L JAN 23-24,1986. 
SEDIMENT LOADS: Maximum daily, 79,000 tons (72,000 tonnes) October 07, 1985; minimum daily, 
0.34 ton (0.31 tonne) JAN 23-24,1986. 
WATER-QUALITY DATA, WATER YEARS OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) (DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
10... 
1450 
133 
139 
7.60 
23.0 
5.0 
<10 
240 
730 
DEC 
13... 
1200 
48 
156 
7.90 
21.0 
4.2 
50 
K73 
360 
FEB 1986 
13... 
102) 
25 
162 
8.15 
19.0 
5.3 
9.3 
104 
11 
K60 
320 
APR 
16... 
1310 21 
173 8.01 24.5 140 
8.7 107 
69 K1900 2800 
JUL 
8... 
1230 
40 
151 
8.15 
25.0 
1.6 
8.5 
105 
13 
K40 
K110 
SEP 
9... 
1435 
25 
183 
8.20 
28.0 
2.9 
8.2 
109 
16 
K90 
260 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD- 
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
10... 
46 
5 
11 
4.5 
6.4 
0.4 
1.5 
41 
<0.5 
11 
7.4 
DEC 
13... 
51 
FEB 1986 
13... 
51 
APR 
16... 
55 
7 
14 
4.9 
9.5 
0.6 
2.7 
48 
<0.5 
12 
8.8 
JUL 
8... 
51 
SEP 
9... 
61 
4 
15 
5.7 
8.3 
0.5 
1.8 
57 
11 
8.1 
K = non-ideal cuunt 
81 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
  
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
  
 
  
 
  
 
 
RIO GRANDE DE ARECIBO BASIN 
50028000 RIO TANAMA NEAR UTUADO, PR--Continued 
WATER-QUALITY DATA, WATER YEARS OCTOBER 1985 TO SEPTEMBER 1986 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEM, 
GEN, 
GEM, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+1403 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
S102) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
<0.10 
23 
89 
32 
8 
0.990 
0.010 
1.00 
0.020 
0.18 
DEC 
13... 
5 
<0.010 
0.800 
0.020 
0.28 
FEB 1986 
13... 
5 
<0.010 
0.700 
0.020 
APR 
16... 
<0.10 
22 
100 
5.7 
126 
0.680 
0.020 
0.700 
0.060 
0.44 
JUL 
8... 
9 
<0.010 
0.700 
0.020 
0.28 
SEP 
9... 
<0.10 
25 
110 
7.4 
4 
<0.010 
0.600 
0.050 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PROS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
10... 
0.20 
1.2 
5.3 
0.020 
<1 
<100 
30 
<1 
9 
20 
DEC 
13... 
0.30 
1.1 
4.9 
0.020 
FEB 1986 
13... 
<0.20 
0.010 
-- 
APR 
16... 
0.50 
1.2 
5.3 
0.050 
<1 
100 
<10 
<1 
8 
20 
JUL 
8... 
0.30 
1.0 
4.4 
0.020 
SEP 
9... 
<0.20 
0.020 
MANGA- 
METHY- 
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
10... 
1000 
2 
50 <0.10 
<1 
<1 
40 <0.010 
5 0.04 
DEC 
13... 
FEB 1986 
13... 
APR 
16... 
2700 
2 140 <0.10 
<1 
<1 
30 <0.010 
2 0.04 
JUL 
8... 
SEP 
9... 
82 
  
   
   
 
      
      
      
      
      
       
 
83 
RIO GRANDE DE ARECIBO BASIN 
50028000 RIO TANAMA NEAR UTUADO, PR--Continued 
WATER-QUALITY DATA, WATER YEARS OCTOBER 1985 TO SEPTEMBER 1986 
PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT 
SED. 
SED. 
SED. 
SEDI-
SUSP. 
SUSP. 
SUSP. 
MENT, 
FALL 
FALL 
FALL 
STREAM- SEDI- DIS- DIAM. DIAN. DIAM. 
FLOW, MENT, CHARGE, PERCENT PERCENT PERCENT 
INSTAN- SUS- SUS- FINER FINER FINER 
DATE TIME TANEOUS PENDED PENDED THAN THAN THAN 
(CFS) 
(MG/L) (T/DAY) .002 MM .004 MM .008 MM 
OCT 1985 
07... 
0720 
3820 
45000 
464000 
4 
5 
9 
APR 1986 
30... 
1740 
4320 
18100 
211000 
7 
13 
19 
MAY 
01... 
1620 
2000 
11700 
63200 
5 
7 
11 
01... 
1650 
1620 
13700 
59900 
6 
10 
15 
02... 
1600 
1600 
15300 
66100 
4 
7 
10 
02... 
1615 
1310 
6530 
23100 
10 
16 
24 
04... 
1755 
810 
2720 
5950 
14 
22 
35 
SED. 
SED. 
SED. 
SED. 
SED. 
SED. 
SED. 
SUSP. 
SUSP. 
SUSP. 
SUSP. 
SUSP. 
SUSP. 
SUSP. 
FALL 
FALL 
SIEVE 
SIEVE 
SIEVE 
SIEVE 
SIEVE 
DIAM. 
DIAM. 
DIAM, 
DIAM. 
DIAM. 
DIAM. 
DIAM. 
PERCENT PERCENT PERCENT PERCENT PERCENT PERCENT PERCENT 
FINER 
FINER 
FINER 
FINER 
FINER 
FINER 
FINER 
DATE 
THAN 
THAN 
THAN 
THAN 
THAN 
THAN 
THAN 
.016 MM 
031 MM .062 MM .125 MM .250 MM .500 MM 1.00 MM 
OCT 1985 
07... 
13 
18 
28 
40 
60 
87 
99 
APR 1986 
30... 
27 
35 
48 
64 
83 
96 
99 
NAY 
01... 
15 
23 
27 
40 
75 
94 
99 
01... 
23 
30 
41 
57 
81 
97 
100 
02... 
15 
19 
33 
49 
69 
93 
99 
02... 
34 
43 
53 
70 
88 
98 
100 
04... 
54 
65 
74 
80 
85 
92 
98 
84 
RIO GRANDE DE ARECIBO BASIN 
50028000 RIO TANAMA NEAR UTUADO, PR--Continued 
SEDIMENT DISCHARGE. SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
MEAN 
MEAN 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DAY 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
OCTOBER 
NOVEMBER 
DECEMBER 
1 
54 
99 
39 
115 
100 
31 
64 
11 
1.9 
2 
39 
24 
2.7 
107 
100 
29 
63 
11 
1.9 
3 
34 
15 
3.2 
128 
402 
230 
62 
11 
1.8 
4 
32 
18 
3.0 
123 
287 
134 
61 
11 
1.8 
5 
34 
19 
1.8 
199 
1010 
2810 
6U 
11 
1.8 
6 
388 
2870 
24900 
124 
326 
151 
58 
11 
1.7 
7 
1510 
9340 
79900 
103 
185 
53 
56 
11 
1.7 
8 
381 
1980 
2980 
90 
125 
30 
54 
11 
1.6 
9 
200 
550 
297 
80 
110 
24 
53 
12 
1.7 
10 
140 
325 
123 
75 
100 
20 
52 
12 
1.7 
11 
114 
238 
73 
75 
100 
20 
52 
12 
1.7 
12 
193 
948 
2050 
80 
110 
24 
51 
12 
1.7 
13 
103 
234 
76 
85 
152 
48 
48 
15 
1.9 
14 
119 
495 
513 
115 
340 
157 
46 
16 
2.0 
15 
102 
261 
106 
193 
761 
772 
46 
15 
1.9 
16 
81 
130 
28 
224 
809 
517 
45 
15 
1.8 
17 
70 
120 
23 
164 
520 
259 
44 
12 
1.4 
18 
69 
95 
19 
135 
358 
147 
43 
IO 
1.2 
19 
63 
60 
10 
107 
218 
63 
42 
10 
1.1 
20 
60 
50 
8.1 
100 
207 
58 
41 
10 
1.1 
21 
74 
179 
90 
101 
172 
50 
40 
10 
1.1 
22 
61 
70 
12 
88 
54 
13 
40 
10 
1.1 
23 
154 
988 
1880 
84 
18 
4.1 
39 
8 
.71 
24 
101 
231 
93 
80 
18 
3.9 
38 
8 
.82 
25 
78 
116 
27 
77 
17 
3.5 
37 
8 
.80 
26 
167 
824 
1520 
74 
16 
3.2 
36 
9 
.87 
27 
322 
2190 
11500 
72 
15 
2.9 
35 
10 
.95 
28 
292 
1460 
3420 
69 
12 
2.2 
35 
10 
.95 
29 
170 
575 
293 
67 
12 
2.2 
34 
10 
.92 
30 
155 
230 
96 
65 
11 
1.9 
34 
10 
.92 
31 
130 
120 
42 
---
---
---
33 
10 
.89 
TOTAL 
5490 
130128.8 
3199 
5663.9 
1442 
43.43 
85 
RIO GRANDE DE ARECIBO BASIN 
50028000 RIO TANAMA NEAR UTUADO, PR--Continued 
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
MEAN 
MEAN 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DAY 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
JANUARY 
FEBRUARY 
MARCH 
1 
33 
10 
.89 
24 
7 
.45 
19 
22 
1.1 
2 
33 
10 
.89 
27 
9 
.66 
18 
20 
.97 
3 
32 
10 
.86 
77 
138 
44 
19 
20 
1.0 
4 
31 
10 
.84 
49 
54 
8.0 
19 
20 
1.0 
5 
30 
10 
.81 
33 
30 
2.7 
18 
16 
.78 
6 
30 
10 
.81 
29 
20 
1.6 
17 
15 
.69 
7 
30 
10 
.81 
27 
20 
1.5 
17 
18 
.83 
8 
29 
10 
.78 
25 
21 
1.4 
17 
18 
.83 
9 
36 
23 
2.9 
24 
20 
1.3 
16 
17 
.73 
10 
34 
21 
2.1 
24 
20 
1.3 
15 
16 
.65 
11 
29 
8 
.63 
24 
20 
1.3 
16 
16 
.69 
12 
27 
8 
.58 
23 
20 
1.2 
16 
16 
.69 
13 
27 
8 
.58 
23 
20 
1.2 
16 
17 
.73 
14 
26 
7 
.49 
23 
20 
1.2 
15 
22 
.89 
15 
26 
7 
.49 
22 
20 
1.2 
15 
20 
.81 
16 
26 
7 
.49 
21 
20 
1.1 
15 
20 
.81 
17 
27 
6 
.44 
23 
20 
1.2 
16 
15 
.65 
18 
26 
6 
.42 
22 
20 
1.2 
22 
23 
2.6 
19 
25 
6 
.41 
21 
20 
1.1 
21 
14 
.91 
20 
25 
6 
.41 
24 
23 
1.7 
16 
12 
.52 
21 
24 
6 
.44 
22 
17 
1.0 
16 
12 
.52 
22 
27 
8 
.66 
20 
15 
.81 
14 
12 
.45 
23 
25 
5 
.34 
19 
13 
.67 
14 
12 
.45 
24 
25 
5 
.34 
19 
18 
.92 
15 
13 
.53 
25 
39 
49 
12 
20 
20 
1.1 
17 
12 
.55 
26 
34 
26 
3.6 
19 
20 
1.0 
16 
11 
.48 
27 
23 
7 
.43 
19 
22 
1.1 
17 
12 
.55 
28 
25 
11 
.85 
19 
22 
1.1 
16 
12 
.52 
29 
26 
10 
.70 
---
---
16 
11 
.48 
30 
56 
150 
82 
16 
10 
.43 
31 
29 
13 
1.2 
15 
10 
.41 
TOTAL 
915 
119.19 
722 
83.01 
515 
23.25 
86 
RIO GRANDE DE ARECIBO BASIN 
50028000 RIO TANAMA NEAR UTUADO, PR--Continued 
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
MEAN 
MEAN 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DAY 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
APRIL 
MAY 
JUNE 
1 
17 
10 
.46 
352 
2570 
13300 
87 
40 
9.4 
2 
16 
10 
.43 
308 
1780 
5560 
81 
40 
8.7 
3 
83 
274 
164 
256 
1280 
2800 
78 
35 
7.4 
4 
46 
174 
30 
263 
1390 
3040 
75 
35 
7.1 
5 
141 
514 
436 
210 
1430 
2930 
72 
30 
5.8 
6 
39 
53 
5.8 
190 
1350 
2650 
68 
25 
4.6 
7 
25 
49 
3.3 
240 
1680 
2800 
88 
152 
59 
8 
58 
420 
723 
200 
1020 
1120 
92 
182 
54 
9 
66 
276 
265 
170 
754 
549 
72 
80 
16 
10 
34 
54 
5.2 
150 
1070 
1270 
92 
168 
74 
11 
25 
50 
3.4 
150 
910 
973 
75 
110 
22 
12 
22 
55 
3.3 
140 
1490 
3470 
82 
123 
35 
13 
21 
55 
3.1 
330 
2020 
6080 
73 
69 
16 
14 
20 
50 
2.7 
440 
900 
614 
64 
30 
5.2 
15 
22 
54 
3.4 
200 
775 
481 
129 
774 
1910 
16 
65 
230 
154 
150 
455 
268 
72 
104 
23 
17 
146 
770 
1580 
120 
155 
84 
60 
60 
9.7 
18 
185 
1010 
3120 
110 
125 
63 
80 
194 
98 
19 
79 
125 
31 
100 
100 
48 
58 
34 
5.8 
20 
92 
181 
72 
88 
45 
11 
52 
25 
3.5 
21 
85 
282 
226 
78 
45 
9.5 
50 
23 
3.1 
22 
35 
70 
6.6 
73 
40 
7.9 
48 
21 
2.7 
23 
30 
60 
4.9 
68 
40 
7.3 
47 
20 
2.5 
24 
30 
60 
4.9 
92 
218 
135 
47 
20 
2.5 
25 
25 
50 
3.4 
72 
97 
21 
46 
19 
2.4 
26 
27 
46 
9.3 
68 
94 
20 
47 
17 
2.2 
27 
25 
20 
1.4 
68 
104 
24 
47 
17 
2.2 
28 
30 
26 
2.0 
96 
241 
180 
44 
18 
2.1 
29 
62 
180 
105 
183 
834 
1440 
43 
19 
2.2 
30 
445 
3190 
26700 
114 
156 
54 
42 
20 
2.3 
31 
---
---
---
94 
40 
10 
---
---
---
TOTAL 
1996 
33669.59 
5173 
50019.7 
2011 
2398.4 
 
87 
RIO GRANDE DE ARECIBO BASIN 
50028000 RIO TANAMA NEAR UTUADO, PR--Continued 
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
MEAN 
MEAN 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DAY 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
JULY 
AUGUST 
SEPTEMBER 
1 
41 
20 
2.2 
41 
25 
2.8 
68 
155 
80 
2 
41 
19 
2.1 
36 
13 
1.3 
43 
30 
3.5 
3 
40 
19 
2.1 
35 
14 
1.3 
35 
15 
1.4 
4 
39 
16 
1.7 
44 
37 
8.9 
33 
12 
1.1 
5 
40 
15 
1.6 
46 
50 
8.5 
30 
10 
.81 
6 
43 
13 
1.5 
35 
10 
.95 
28 
10 
.76 
7 
41 
15 
1.7 
126 
952 
3990 
27 
9 
.66 
8 
40 
18 
1.9 
57 
61 
10 
27 
9 
.66 
9 
38 
20 
2.1 
48 
58 
10 
27 
9 
.66 
10 
36 
20 
1.9 
51 
90 
36 
26 
9 
.63 
11 
45 
44 
8.1 
52 
8.3 
22 
25 
8 
.54 
12 
39 
18 
1.9 
36 
12 
1.2 
25 
8 
.54 
13 
35 
15 
1.4 
41 
26 
3.6 
25 
8 
.54 
14 
55 
91 
26 
36 
18 
1.7 
24 
8 
.52 
15 
60 
" 
21 
33 
15 
1.3 
22 
8 
.48 
16 
21 
30 
13 
1.1 
22 
8 
.48 
17 
cao 
30 
13 
1.1 
25 
10 
.84 
18 
30 
12 
.97 
26 
10 
.70 
19 
30 
12 
.97 
23 
10 
.62 
2 
30 
12 
.97 
22 
10 
.59 
21 
28 
12 
.91 
22 
10 
.59 
22 
29 
12 
.94 
28 
14 
1.2 
23 
1 
18 
2.0 
25 
10 
.68 
24 
, 
15 
1.6 
24 
9 
.58 
25 
43 
51 
19 
26 
13 
1.2 
26 
41 
28 
3.6 
23 
10 
.62 
27 
43 
'0 
.78 
21 
10 
.57 
28 
42 
2.2 
30 
20 
2.0 
29 
40 
39 
25 
10 
.68 
30 
42 
24 
32 
22 
10 
.59 
31 
44 
27 
'.9 
---
---
---
TOTAL 
1437 
829 
104.74 
YEAR 
25021 
22734 
I
I
I
I 
I
  
 
 
I
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
88 
RIO GRANDE DE ARECIBO BASIN 
50028400 RIO TANAMA AT CHARCO 140NDO, PR 
LOCATION.--Lat 18°24'52", long 66°42'52", on right bank at abandoned power house at Charco Hondo, 1.5 mi (2.4 km) 
upstream from mouth, and 4 mi (6 km) south of Arecibo. 
DRAINAGE AREA.--57.6 i 2 (149.2 km2 ). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--April 1969 to June 1971, October 1981 to current year. 
GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 60 ft (18 m), from topographic map. 
REMARKS.--Estimated daily discharges: Oct. 7-11, Dec. 3-11, Mar. 11-13, May 16-21, 24, 28-30 and June 7, 8, 10, 11, 
15. Records fair except those for estimated daily discharges, which are poor. Diversion 0.8 i (1.3 km) upstream 
for municipal supply of Arecibo. 
AVERAGE DISCHARGE.--6 years (1970,1982-86), 102 ft'is (2.889 m'/s), 24.05 in/yr (611 mm/yr), 73,900 acre-ft/yr 
(91.1 hm'/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 15,000 ft'is (425 m 3/s), May 18, 1985, gage height. 17.95 ft 
(5.471 ), from floodmark, fro rating curve extended above 1,000 ft'/s (28.3 
3/s) on basis of step-backwater 
analysis; minimum discharge, 21 ft'/s (0.595 m'/s), Apr. 27, 1984. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft'is (56.6 e/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date Time (ft3/s) (e/s) (ft) (m) 
Date Time (ft3/s) (e/s) (ft) (m) 
Oct. 7 
unknown 
*11,700 
331 
*17.11 5.215 
May 
1 
2000 
2,520 
71.4 
10.82 3.298 
Oct. 27 
1915 
2,340 
66.3 
10.60 3.231 
May 
2 
1900 
2,250 
63.7 
10.48 3.194 
Apr. 30 
2115 
4,310 
122 
12.78 3.895 
May 14 
0215 
2,730 
77,3 
11.09 3.380 
Minimum discharge, 22 ft'/s (0.623 '/s), Apr.1. 
DISCHARGE, IN CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
113 
142 
90 
38 
52 
38 
25 
571 
155 
53 
69 
97 
2 
124 
128 
87 
39 
51 
47 
26 
740 
144 
51 
48 
130 
3 
69 
217 
82 
36 
97 
42 
66 
607 
136 
49 
44 
156 
4 
59 
380 
80 
37 
110 
39 
225 
531 
115 
49 
43 
193 
5 
58 
485 
76 
35 
72 
37 
368 
512 
101 
49 
75 
105 
6 
554 
347 
75 
35 
57 
38 
161 
450 
96 
49 
111 
78 
7 
2500 
248 
74 
35 
52 
38 
101 
598 
140 
48 
129 
58 
8 
900 
183 
71 
36 
50 
35 
151 
463 
160 
47 
99 
52 
9 
400 
149 
69 
39 
48 
36 
197 
371 
107 
46 
70 
49 
10 
250 
138 
67 
51 
46 
36 
204 
332 
130 
46 
83 
46 
11 
190 
129 
66 
39 
44 
35 
107 
331 
125 
45 
127 
44 
12 
330 
128 
63 
39 
43 
34 
81 
289 
104 
52 
64 
41 
13 
332 
135 
60 
36 
43 
33 
65 
707 
97 
44 
56 
44 
14 
219 
162 
57 
36 
41 
34 
47 
982 
85 
52 
73 
41 
15 
206 
362 
56 
36 
40 
33 
41 
467 
180 
69 
55 
38 
16 
173 
527 
55 
38 
40 
34 
42 
310 
105 
72 
50 
38 
17 
144 
391 
54 
38 
45 
33 
174 
240 
89 
92 
52 
38 
18 
122 
273 
52 
37 
43 
62 
485 
225 
91 
93 
49 
42 
19 
117 
216 
50 
36 
45 
64 
227 
205 
107 
56 
50 
37 
20 
103 
182 
48 
35 
45 
46 
110 
190 
82 
54 
49 
36 
21 
101 
177 
48 
36 
41 
32 
183 
180 
87 
77 
45 
38 
22 
111 
151 
47 
38 
41 
27 
127 
172 
76 
52 
45 
44 
23 
128 
140 
45 
38 
40 
27 
79 
162 
71 
49 
45 
47 
24 
212 
131 
43 
38 
39 
27 
74 
190 
66 
48 
52 
40 
25 
158 
121 
43 
38 
38 
30 
81 
165 
64 
53 
44 
40 
26 
246 
113 
42 
58 
38 
28 
57 
161 
64 
52 
63 
42 
27 
439 
108 
43 
43 
36 
29 
54 
183 
63 
56 
45 
35 
28 
379 
102 
40 
40 
37 
39 
72 
280 
59 
54 
59 
44 
29 
250 
98 
40 
46 
---
28 
109 
420 
55 
51 
68 
60 
30 
187 
94 
40 
55 
26 
498 
300 
54 
68 
97 
39 
31 
167 
---
37 
73 
24 
---
174 
---
78 
71 
---
TOTAL 
9341 
6157 
1800 
1254 
1374 
1111 
4237 
11508 
3008 
1754 
2030 
1792. 
MEAN 
301 
205 
58.1 
40.5 
49.1 
35.8 
141 
371 
100 
56.6 
65.5 
59.7 
MAX 
2500 
527 
90 
73 
110 
64 
498 
982 
180 
93 
129 
193 
MIN 
58 
94 
37 
35 
36 
24 
25 
161 
54 
44 
43 
35 
CFSM 
5.23 
3.56 
1.01 
.70 
.85 
.62 
2.45 
6.44 
1.74 
.98 
1.14 
1.04 
IN. 
6.03 
3.98 
1.16 
.81 
.89 
.72 
2.74 
7.43 
1.94 
1.13 
1.31 
1.16 
AC-FT 
18530 
12210 
3570 
2490 
2730 
2200 
8400 
22830 
5970 
3480 
4030 
3550 
CAL YR 1985 TOTAL 
40582 
MEAN 
111 
MAX 
2500 
MIN 
34 
CFSM 1.93 
IN. 
26.21 
AC-FT 
80490 
WTR YR 1986 TOTAL 
45366 
MEAN 
124 
MAX 
2500 
MIN 
24 
CFSM 2.15 
IN. 
29.30 
AC-FT 
89980 
 
89 
RIO GRANDE DE ARECIBO BASIN 
50028400 RIO TANAMA AT CHARCO HONDO, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS MARCH 1983 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
STREAMFLOW, 
SPECIFIC CON-
TEMPERA­
DATE 
TIME 
INSTANTANEOUS 
DUCTANCE 
TURE 
DATE 
TIME 
INSTANTANEOUS 
DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
NOV, 21 1308 
64 
256 
23.0 
JUL, 10 1333 
47 
257 
26.0 
DEC, 11 1306 
176 
267 
23.5 
AUG, 12 1356 
586 
257 
26.0 
JUN, 16 1302 
106 
185 
24.5 
SEP, 08 1245 
51 
273 
25.0 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
90 
RIO GRANDE DE ARECIBO BASIN 
50029000 RIO GRANDE DE ARECIBO AT CENTRAL CAMBALACHE, PR 
WATER-QUALITY RECORDS 
LOCATION.--Tat 18°27'20", long 66'42'10", Hydrologic Unit 21010002, at bridge on unimproved road, about 500 ft 
(152 m) upstream from Central Cambalache, near Highway 2, 8.3 mi (13.4 km) downstream from Dos Bocas Reservoir, 
1.9 mi (3.1 km) downstream from Rio Tanama , and 1.6 mi (2.6 km) southeast cf Arecibo, 
DRAINAGE AREA.--200 sq mi (520 sq km), approximately. 
PERIOD OF RECORD.--Water years 1963-66, 1969 to current year. 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) (US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
28... 
1410 
18 
174 
7.80 
26.5 
110 
25 
2000 
3500 
DEC 
04... 
1040 
224 
260 
7.80 
23.0 
6.1 
--
<10 
480 
200 
FEB 1986 
24... 
1120 
174 
250 
8.30 
23.0 
2.2 
9.3 
109 
25 
410 
810 
MAY 
8... 
1425 
2210 
230 
8.08 
25.5 
120 
8.4 
103 
18 
K1800 
K8900 
JUL 
07... 
145 
296 
7.97 
28.0 
6.5 
8.9 
113 
<10 
--
07... 
1310 
145 
296 
7.97 
28.0 
6.5 
8.9 
113 
<10 
K110 
K20 
SEP 
9... 
0940 
182 
310 
8.15 
26.5 
2.2 
7.9 
98 
13 
K950 
360 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM ROTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD-
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- 01S-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
28... 
68 
2 
19 
5.0 
8.0 
0.4 
2.4 
66 
<0.5 
11 
8.1 
DEC 
04... 
105 
FEB 1986 
24... 
94 
MAY 
8... 
73 
1 
23 
3.8 
6.7 
0.4 
1.9 
72 
<0.5 
8.2 
8.0 
JUL 
07... 
129 
07... 
129 
SEP 
9... 
120 
4 
39 
5.9 
9.2 
0.4 
2.1 
118 
11 
9.4 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/1 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
28... 
<0.10 
18 
110 
5.5 
180 
0.770 
0.030 
0.800 
0.050 
0.75 
DEC 
04... 
1 
0.860 
0.040 
0.900 
0.340 
0.46 
FEB 1986 
24... 
2 
<0.010 
0.500 
0.320 
0.28 
MAY 
08... 
<0.10 
16 
110 
660 
130 
0.870 
0.030 
0.900 
0.060 
0.54 
JUL 
07... 
6 
--
07... 
6 
<0.010 
0.600 
0.040 
0.16 
SEP 
09... 
0.10 
17 
160 
81 
6 
<0.010 
0.500 
0.060 
0.24 
K = non-ideal count 
 
 
    
    
 
          
         
          
    
     
          
    
    
 
    
  
       
 
 
          
 
        
  
   
 
 
  
 
 
91 
RIO GRANDE DE ARECIBO BASIN 
50029000 RIO GRANDE DE ARECIBO AT CENTRAL CAMBALACHE, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO2) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
28... 
0.80 
1.6 
7.1 
0.240 
<1 
<100 
40 
<1 
29 
80 
DEC 
04... 
0.50 
1.4 
6.2 
0.040 
FEB 1986 
24... 
0.30 
0.80 
3.5 
0.020 
--
MAY 
08... 
0.60 
1.5 
6.6 
0.080 
<1 
100 
60 
1 
13 
40 
JUL 
07... 
--
07... 
0.20 
0.80 
3.5 
0.030 
SEP 
09... 
0.30 
0.80 
3.5 
0.030 
MANGA-
METHY-
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
28... 
11000 
44 340 0.10 
<1 
<1 
70 <0.010 
<1 0.04 
DEC 
04... 
FEB 1986 
24... 
MAY 
8... 
8000 
5 190 0.10 
<1 
<1 210 <0.010 
1 0.05 
JUL 
07... 
07... 
SEP 
9... 
 
 
  
 
 
93 
.206 
0 
BARCELONETA 
207 
VEGA BAJA 
I 
0381 
MANAfl 
.208 .
209 
VEGA ALTA 
a 
a.. 
• 210 
Drainage boundaries indeterminate 
in limestone terrane 
0388 
035950 AV 
CI 
Limestone 
a 
MOROVIS 
igneous and 
sedimentary racks 
Drainage 
Kra Cibuto basin
boundary 
Droinogs boundary 
R'o Grand* 
de Arecibo basin 
IR ,'o de la Plata basin 
Pra 
Island 
..44— Canal dr Aceitunas and 
tunnel to fica Jeccguos 
tRi'a apatite 
basin 
EXPLANATION 
Rib Inaba% basin 
A 0350 SURFACE-WATER STATION AND NUMBER 
V 0307 QUALITY-OF-WATER STATION AND NUMBER 
*210 WELL AND WELL NUMBER 
25 
4 
5 KILOMETERS 
2 
5 MILES 
Figure 14.--Rio Grande de Manati basin. 
 
 
         
 
    
 
     
       
  
           
           
           
           
           
 
 
 
 
 
 
 
  
 
         
           
         
           
 
 
           
 
          
 
 
 
     
         
 
 
          
         
          
 
 
   
 
     
          
 
 
  
      
  
94 
RIO GRANDE DE MANATI BASIN 
50030700 RIO OROCOVIS NEAR OROCOVIS, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°14'20", long 66'22'58", at flat low bridge about 300 ft (91 m) northwest of Highway 568, 1.0 mi 
(1.6 km) north of Orocovis plaza. 
DRAINAGE AREA.--10.1 sq mi (26.2 sq km). 
PERIOD OF RECORD.--Water year 1979 to current year. 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
17... 
1525 
30 
214 
8.20 
24.5 
5.0 
10 
20000 
6000 
DEC 
23... 
1230 
16 
255 
8.60 
24.0 
2.2 
7.6 
95 
18 
K1500 
200 
FEB 1986 
03... 
1635 
14 
247 
8.60 
22.5 
15 
8.8 
109 
14 
K9500 
4100 
APR 
28... 
1430 
10 
327 
8.63 
25.5 
2.2 
8.3 
106 
<10 
K590 
K1200 
JUL 
23... 
1155 
8.1 
284 
8.65 
27.0 
2.3 
5.8 
76 
14 
380 
K100 
SEP 
03... 
1550 
6.1 
320 
8.30 
27.5 
2.4 
7.3 
98 
<10 
3000 
860 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD-
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
17... 
82 
5 
19 
8.4 
10 
0.5 
1.7 
77 
<0.5 
9.1 
12 
DEC 
23... 
92 
FEB 1986 
03... 
96 
APR 
28... 
120 
0 
30 
11 
13 
0.5 
1.8 
120 
<0.5 
9.9 
14 
JUL 
23... 
125 
SEP 
03... 
130 
13 
32 
12 
14 
0.6 
2.2 
116 
11 
14 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
17... 
0.10 
30 
140 
11 
8 
0.790 
0.010 
0.800 
0.030 
0.27 
DEC 
23... 
1 
<0.010 
0.900 
0.020 
0.48 
FEB 1986 
03... 
13 
0.780 
0.020 
0.800 
0.030 
0.47 
APR 
28... 
0.10 
30 
180 
5.2 
1 
0.890 
0.010 
0.900 
0.040 
0.36 
JUL 
23... 
4 
<0.010 
0.600 
<0.010 
SEP 
03... 
0.10 
34 
190 
3.1 
1 
<0.010 
1.00 
<0.010 
K = non-ideal count 
 
 
    
    
 
          
         
 
    
  
        
          
        
95 
RIO GRANDE DE MANATI BASIN 
50030700 RIO OROCOVIS NEAR OROCOVIS, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
17... 
0.30 
1.1 
4.9 
0.110 
<1 
<100 
30 
1 
6 
<10 
DEC 
23... 
0.50 
1.4 
6.2 
0.110 
FEB 1986 
03... 
0.50 
1.3 
5.8 
0.170 
APR 
28... 
0.40 
1.3 
5.8 
0.230 
<1 
<100 
40 
<1 
12 
10 
JUL 
23... 
0.30 
0.90 
4.0 
0.130 
SEP 
03... 
0.50 
1.5 
6.6 
0.160 
MANGA-
METHY-
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
EPABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
17... 
410 
<1 
30 
<0.10 
<1 
<1 
<10 
<0.010 
<1 
0.06 
DEC 
23... 
FEB 1986 
03... 
APR 
28... 
140 
1 
20 
<0.10 
<1 
<1 
20 
<0.010 
1 
0.06 
JUL 
23... 
SEP 
03... 
 
I
I
I
I 
I
I 
I
I
I
 
I
 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
  
 
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
96 
RIO GRANDE DE MANATI BASIN 
50031200 RIO GRANDE DE MANATI NEAR MOROVIS, PR 
LOCAT1ON.--Lat 18°17'45', long 66'24'47', Hydrologic Unit 21010001, on right bank 
0.1 i (0.2 km) downstream 
from Quebrada Perchas, 0.8 mi (1.3 km) upstream from Rio Sana Muerto, and 2.2 i (3.5 km) south of Morovis. 
DRAINAGE AREA.--55.2 mi' (143.0 km'). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--January 1965 to current year. 
GAGE.--Water-stage recorder and concrete control. Elevation of gage is 440 ft (134 ), fro topographic nap. 
Feb. 2, 1966 to Apr. 27, 1967, staff gage read twice daily. 
REMARKS.--Estimated daily discharge: Oct. 6, 7, June 3, 4 and Aug. 29-31. Records fair except those for estimated 
daily discharges, which are poor. Public water-supply pumpage, about 300 ft (91 ) above the station, influences 
low-flow discharges. 
AVERAGE DISCHARGE.--21 years (1966-86), 107 ft'/s (3.030 m'/s), 26.32 in/yr (668 mm/yr), 77,520 acre-ft/yr 
(95.6 hie/yr); median of yearly mean discharges, 110 ft'/s (3.12 m'/s), 79,700 acre-ft/yr (98 he'/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maxinu discharge, 48,000 ft'/s (1,359 '/s), May 18, 1985, gage height, 17.89 ft 
(5.453 ), from floodaarks, from rating curve extended above 200 ft'/s (5.66 'Js) on basis of computations 
of flow over broad-crested weir and step-backwater analysis; minimum discharges, 4.4 ft'/s (0.125 60/s), 
Apr. 15, 1984. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,500 ft'/s (99.1 '/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(fti/s) (0/s) 
(ft) 
(a) 
Date 
Time 
(W/s) (e/s) 
(ft) 
(n) 
Oct. 6 
unknown *28,500 
807 
*13.67 4.167 
May 13 
0745 
15,900 
450 
10.38 3.164 
May 
1 
1730 
4,540 
129 
5.73 1.747 
May 13 
2330 
18,100 
513 
11.01 3.356 
Minimum discharge, 25 ft'is (0.108 50/s), Mar. 31. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
41 
153 
110 
63 
47 
33 
28 
794 
101 
53 
39 
182 
2 
48 
131 
107 
61 
53 
32 
26 
387 
92 
51 
38 
161 
3 
37 
123 
102 
59 
96 
31 
88 
230 
95 
51 
36 
76 
4 
37 
120 
102 
61 
81 
31 
111 
278 
100 
48 
42 
52 
5 
109 
115 
97 
56 
171 
31 
327 
280 
97 
50 
40 
42 
6 
6200 
103 
102 
54 
81 
30 
172 
174 
90 
52 
35 
39 
7 
3600 
101 
97 
56 
61 
31 
73 
225 
88 
57 
35 
35 
8 
554 
92 
92 
56 
54 
29 
339 
513 
91 
49 
35 
33 
9 
282 
90 
90 
67 
49 
31 
298 
489 
88 
47 
33 
31 
10 
198 
91 
90 
71 
46 
31 
112 
403 
82 
42 
33 
30 
11 
163 
98 
90 
57 
42 
31 
77 
636 
82 
43 
32 
30 
12 
145 
157 
88 
53 
42 
29 
58 
324 
81 
48 
34 
29 
13 
136 
207 
86 
52 
41 
29 
50 
2740 
85 
42 
60 
29 
14 
127 
326 
82 
51 
41 
32 
45 
1090 
80 
80 
57 
29 
15 
120 
832 
81 
49 
41 
35 
42 
360 
72 
144 
36 
28 
16 
111 
614 
82 
52 
40 
32 
61 
259 
74 
94 
32 
27 
17 
106 
337 
79 
55 
41 
29 
67 
230 
69 
80 
31 
27 
18 
115 
328 
76 
53 
41 
30 
87 
212 
67 
54 
29 
27 
19 
106 
205 
78 
47 
39 
30 
79 
190 
64 
48 
26 
27 
20 
102 
203 
76 
46 
49 
31 
110 
167 
63 
44 
26 
26 
21 
97 
307 
75 
44 
45 
28 
173 
156 
58 
44 
27 
27 
22 
93 
194 
76 
43 
39 
27 
130 
153 
56 
42 
27 
28 
23 
117 
159 
73 
44 
38 
26 
72 
160 
56 
43 
32 
28 
24 
304 
147 
73 
49 
36 
30 
59 
137 
53 
42 
129 
30 
25 
223 
138 
69 
119 
35 
33 
52 
128 
53 
43 
112 
33 
26 
210 
123 
70 
160 
33 
29 
47 
131 
52 
41 
43 
33 
27 
299 
120 
66 
63 
33 
29 
46 
126 
54 
42 
33 
43 
28 
317 
115 
68 
51 
32 
28 
48 
216 
52 
42 
147 
63 
29 
219 
112 
65 
47 
---
29 
219 
161 
53 
40 
300 
33 
30 
166 
112 
63 
46 
32 
653 
118 
53 
40 
150 
30 
31 
204 
---
62 
45 
27 
---
107 
---
48 
70 
---
TOTAL 
14586 
5953 
2567 
1830 
1447 
936 
3749 
11574 
2201 
1644 
1799 
1308 
MEAN 
471 
198 
82.8 
59.0 
51.7 
30.2 
125 
373 
73.4 
53.0 
58.0 
43.6 
MAX 
6200 
832 
110 
160 
171 
35 
653 
2740 
101 
144 
300 
182 
MIN 
37 
90 
62 
43 
32 
26 
26 
107 
52 
40 
26 
26 
CFSM 
8.53 
3.59 
1.50 
1.07 
.94 
.55 
2.26 
6.76 
1.33 
.96 
1.05 
.79 
IN. 
9.83 
4.01 
1.73 
1.23 
.98 
.63 
2.53 
7.80 
1.48 
1.11 
1.21 
.88 
AC-FT 
28930 
11810 
5090 
3630 
2870 
1860 
7440 
22960 
4370 
3260 
3570 
2590 
CAL YR 1985 TOTAL 
64935 
MEAN 
178 
MAX 
17100 
MIN 
19 
CFSM 3.22 
IN. 
43.76 
AC-FT 128800 
WTR YR 1986 TOTAL 
49594 
MEAN 
136 
MAX 
6200 
MIN 
26 
CFSM 2.46 
IN. 
33.42 
AC-FT 
98370 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
RIO GRANDE DE MANATI BASIN 
50031200 RIO GRANDE DE MANATI NEAR MOROVIS, PR--Continued 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1968 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
17... 
1210 
101 
238 
8.00 
26.5 
5.0 
<10 
K170 
56 
DEC 
12... 
1415 
87 
275 
7.30 
24.0 
1.1 
7.6 
91 
<10 
2900 
96 
FEB 1986 
03... 
1315 
109 
251 
8.50 
21.5 
22 
8.8 
103 
20 
K11000 
2700 
APR 
15... 
1355 
43 
286 
8.22 
30.0 
3.5 
7.3 
98 
18 
K82 
K180 
JUL 
14... 
1430 
47 
244 
8.20 
28.0 
2.5 
8.2 
106 
21 
460 
82 
SEP 
03... 
1215 
77 
237 
8.06 
28.0 
43 
7.7 
100 
<10 
2800 
K800 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARS CALCIUM SIUM, SODIUM, 
AD- 
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- 
(AGA 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CACC3) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
17... 
90 
4 
21 
9.2 
11 
0.5 
2.3 
86 
<0.5 
9.9 
13 
DEC 
12... 
82 
FEB 1986 
03... 
96 
APR 
15... 
99 
3 
23 
10 
11 
0.5 
2.3 
96 
<0.5 
11 
17 
JUL 
14... 
99 
SEP 
03... 
85 
11 
20 
8.6 
11 
0.5 
2.8 
74 
12 
12 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
5102) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
17... 
0.10 
26 
140 
39 
13 
0.890 
0.010 
0.900 
0.030 
0.27 
DEC 
12... 
1 
<0.010 
0.900 
0.020 
0.28 
FEB 1986 
03... 
40 
0.690 
0.010 
0.700 
0.040 
0.56 
APR 
15... 
0.10 
26 
160 
18 
6 
<0.010 
0.700 
0.020 
0.38 
JUL 
14... 
6 
<0.010 
0.200 
0.010 
0.29 
SEP 
03... 
0.10 
25 
140 
28 
48 
0.980 
0.020 
1.00 
0.040 
0.36 
K = non-ideal count 
97 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
RIO GRANDE DE MANATI BASIN 
50031200 RIO GRANDE DE MANATI NEAR MOROVIS, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PROS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
17... 
0.30 
1.2 
5.3 
0.040 
<1 
<100 
40 
1 
5 
10 
DEC 
12... 
0.30 
1.2 
5.3 
0.050 
FEB 1986 
03... 
0.60 
1.3 
5.8 
0.080 
APR 
15... 
0.40 
1.1 
4.9 
0.050 
<1 
<100 
60 
1 
11 
60 
JUL 
14... 
0.30 
0.50 
2.2 
0.030 
SEP 
03... 
0.40 
1.4 
6.2 
0.090 
MANGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L; 
(MG/L) 
OCT 1985 
17... 
260 
1 
30 
<0.10 
<1 
<1 
30 
<0.010 
3 
0.05 
DEC 
12... 
FEB 1986 
03... 
APR 
15... 
480 
1 
30 
<0.10 
<1 
<1 
30 
<0.010 
3 
0.04 
JUL 
14...
-- 
SEP 
03... 
98 
I 
I
I
I
I
I
 
 
 
99 
RIO GRANDE DE MANATI BASIN 
50035000 RIO GRANDE DE MANATI AT CIALES, PR 
LOCATION.--Lat 18°19'26", lung 66°27'36", Hydrologic Unit 21010001, on left bank, 1.6 mi (2.6 km) upstream from 
Hwy 145 bridge, 0.8 mi (1.3 km) downstream from Quebrada Saliente, 0.9 mi (1.4 km) upstream from Quebrada Cojo 
Vales, and 1.2 mi (1.9 km) southeast of Ciales. 
DRAINAGE AREA.--128 mi' (332 km,), excludes 6.0 mi' (15.5 km 2), the runoff from which is diverted through 
El Guineo and de Matrullas reservoirs. 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--September 1946 to September 1953, May 1956 to December 1957 (unpublished, available in files 
of Caribbean District Office and in the National Water Data Storage and Retrieval System, Washington, D.C.); 
February 1959 to Saptember 1960 (monthly discharge measurements only); October 1960 to current year. Equivalent 
record from .; -mar, 1971 to December 1972 published as 50035200 Rio Grande de Manati at Highway 145 at Ciales 
at site 1.6 mi (2.6 km) downstream, drainage area 132 mil (342 km 2 ). 
GAGE.--Water-si.,:ge recorder. Elevation of gage is 140 ft (43 m), fro topographic map. Prior to Apr. 1, 1962 , 
staff gage, read twice daily, at site 100 ft (30 ) upstream at same datum. January 1971 to December 1972 at 
site 1.6 mi (2.6 km) downstream at different datum. 
REMARKS.--Estimated daily discharges: May 1. Records fair except those for estimated daily discharges, 
which are poor. 
AVERAGE DISCHARGE.--26 years (1961-86), 268 ft'is (7.590 m'/s), 28.43 in/yr (722 m/yr), 194,200 acre-ft/yr (239 
hm'/yr); median of yearly mean discharges, 260 ft'is (7.36 m 3/s), 188,000 acre-ft/yr (230 he/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 125,000 Wis. (3,540 m'/s), Oct. 9, 1970, gage height, 
24.0 ft (7.32 m), from floodmark, from rating curve extended above 3,000 ft'/s (85.0 10/s) on basis of 
slope-area measurements of peak flow at gage heights 13.2 ft (4.02 m), 15.0 ft (4.57 ), 19.0 ft (5.79 ), 
and 24.0 ft (7.:a m), datum then in use; minimum discharge, 20 ft'A (0.566 m'/s), Apr. 20, 21, 1984. 
EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate gage heights of major floods, pointed out by local residents are 
as follows: August 1899, 50 ft (15.2 m), September 1928, 36 ft (11.0 m), and September 1932, 34 ft (10.4 m) at 
site 1.6 mi (2.6 km) upstream. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 7,000 ft'is (198 '/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft7s) 
(e/s) 
(ft) 
(m) 
Date 
Time 
(ft'/s) 
(e/s) 
(ft) 
(m) 
Oct. 7 
0115 
*75,400 
2,135 
*19.75 6.020 
May 13 
0830 
45,400 
1,286 
15.64 4.767 
Apr. 30 
1700 
10,400 
294 
7.93 2.417 
May 13 
2230 
53,900 
1,526 
16.92 5.157 
May 
1 
1800 
8,390 
238 
7.18 2.188 
Minimum discharge, 47 ft'is (1.33 10/s), Mar. 28, 29, 31, Apr. 1-3. 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
  
 
100 
RIO GRANDE DE MANATI BASIN 
50035000 RIO GRANDE DE MANATI AT CIALES, PR--Continued 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
141 
375 
261 
134 
100 
72 
47 
2450 
268 
108 
87 
503 
2 
173 
335 
253 
131 
114 
70 
47 
1670 
221 
107 
80 
339 
3 
121 
315 
241 
125 
280 
69 
196 
637 
208 
106 
76 
168 
4 
107 
315 
239 
124 
214 
68 
263 
564 
193 
104 
81 
131 
5 
204 
286 
234 
122 
359 
69 
1050 
1180 
178 
107 
83 
97 
6 
6590 
388 
245 
120 
185 
68 
501 
550 
171 
122 
74 
87 
7 
26500 
353 
233 
120 
136 
67 
165 
568 
183 
139 
72 
79 
8 
2670 
271 
221 
117 
120 
66 
1050 
1390 
203 
113 
73 
75 
9 
1020 
244 
218 
130 
108 
65 
958 
1740 
187 
105 
73 
73 
10 
616 
231 
210 
148 
102 
65 
241 
1100 
162 
99 
69 
70 
11 
485 
233 
206 
120 
95 
66 
165 
2130 
189 
99 
65 
68 
12 
421 
364 
205 
114 
95 
66 
124 
746 
165 
103 
63 
68 
13 
377 
496 
201 
111 
92 
64 
108 
12500 
158 
96 
79 
67 
14 
340 
1220 
194 
106 
90 
65 
97 
4740 
151 
169 
106 
67 
15 
329 
3850 
191 
102 
87 
69 
89 
937 
142 
369 
80 
63 
16 
295 
3010 
189 
102 
87 
66 
108 
561 
146 
244 
72 
62 
17 
282 
1380 
182 
102 
87 
60 
247 
490 
137 
174 
67 
60 
18 
290 
1510 
176 
106 
91 
64 
223 
467 
135 
125 
63 
60 
19 
275 
684 
174 
98 
86 
65 
198 
371 
133 
102 
60 
58 
20 
261 
550 
171 
92 
98 
64 
360 
323 
130 
100 
59 
58 
21 
248 
784 
166 
91 
104 
58 
360 
301 
127 
97 
58 
60 
22 
225 
490 
162 
91 
87 
52 
242 
287 
122 
92 
57 
65 
23 
325 
400 
159 
92 
83 
50 
144 
264 
121 
88 
58 
65 
24 
758 
357 
154 
93 
80 
52 
134 
249 
118 
192 
165 
62 
25 
535 
340 
150 
220 
77 
58 
127 
242 
115 
159 
190 
75 
26 
1480 
311 
149 
343 
76 
55 
106 
265 
11.4 
113 
81 
68 
27 
1230 
295 
145 
126 
73 
51 
95 
237 
116 
89 
68 
69 
28 
1020 
282 
141 
104 
72 
49 
97 
428 
110 
92 
308 
92 
29 
703 
274 
140 
96 
---
51 
499 
418 
109 
98 
514 
71 
30 
472 
267 
136 
93 
61 
2340 
322 
108 
95 
236 
66 
31 
488 
---
134 
119 
51 
---
300 
---
99 
165 
---
TOTAL 
48981 
20210 
5880 
3792 
3278 
1916 
10381 
38427 
4620 
3905 
3382 
2946 
MEAN 
1580 
674 
190 
122 
117 
61.8 
346 
1240 
154 
126 
109 
98.2 
MAX 
26500 
3850 
261 
343 
359 
72 
2340 
12500 
268 
369 
514 
503 
MIN 
107 
231 
134 
91 
72 
49 
47 
237 
108 
88 
57 
58 
CFSM 
12.3 
5.27 
1.48 
.95 
.91 
.48 
2.70 
9.69 
1.20 
.98 
.85 
.77 
IN. 
14.24 
5.87 
1.71 
1.10 
.95 
.56 
3.02 
11.17 
1.34 
1.13 
.98 
.86 
AC-FT 
97150 
40090 
11660 
7520 
6500 
3800 
20590 
76220 
9160 
7750 
6710 
5840 
CAL YR 1985 
TOTAL 
180518 
MEAN 
495 
MAX 
42700 
MIN 
45 
CFSM 
3.87 
IN. 
52.41, 
AC-FT 
358100 
WTR YR 1986 
TOTAL 
147718 
MEAN 
405 
MAX 
26500 
MIN 
47 
CFSM 
3.16 
IN. 
42.93 
AC-FT 
293000 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS 1979 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
STREAMFLOW, 
SPECIFIC CON-
TEMPERA­
DATE 
TIME 
INSTANTANEOUS 
DUCTANCE 
TURE 
DATE 
TIME 
INSTANTANEOUS 
DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
DEC, 13 1056 
199 
234 
23.0 
JUL, 11 1022 
89 
241 
28.0 
MAY, 27 0955 
234 
205 
25.5 
AUG, 13 1039 
67 
236 
27.5 
JUN, 13 1047 
160 
222 
22.3 
SEP, 05 1017 
98 
218 
28.0 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
101 
RIO GRANDE DE MANATI BASIN 
50035500 RIO GRANDE DE MANATI AT HIGHWAY 149 AT CIALES, RP 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18'20'46", long 66°28'06", at bridge on Highway 149, about 800 ft (244 m) upstream from confluence 
with Rio Cialitos, 0.5 mi (0.8 km) north of Ciales plaza. 
DRAINAGE AREA.--136 sq mi (352 sq km) this excludes the 6 sq mi (15.5 sq km) upstream from Lago El Guineo and Lago 
de Matrullas, flow from which is diverted to Rio Jacaguas. 
PERIOD OF RECORD.--Water years 1979 to current year. 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
1i1E TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) (DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
10... 
1350 
852 
146 
7.70 
29.5 
3.4 
7.8 
104 
11 
720 
5500 
DEC 
24... 
1000 
164 
239 
8.30 
23.0 
2.4 
8.6 
100 
<10 
K180 
K100 
FEB 1986 
26... 
1130 
60 
255 
8.20 
23.0 
2.0 
9.6 
112 
<10 
APR 
23... 
1425 
143 
210 
8.00 
26.5 
59 
8.5 
107 
17 
3400 
K1400 
JUL 
17... 
1010 
203 
207 
7.75 
27.0 
15 
8.3 
105 
10 
2100 
K12000 
SEP 
18... 
1115 
70 
249 
8.00 
28.5 
6.2 
8.5 
110 
24 
K20 
K30 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD-
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS 5) 
AS SO4) 
AS CL) 
OCT 1985 
10... 
53 
5 
13 
5.0 
8.0 
0.5 
2.2 
48 
<0.5 
8.9 
9.3 
DEC 
24... 
82 
FEB 1986 
26... 
93 
APR 
23... 
77 
7 
19 
7.2 
10 
0.5 
2.0 
70 
<0.5 
11 
11 
JUL. 
17... 
72 
SEP 
18... 
96 
0 
23 
9.4 
13 
0.6 
2.1 
98 
10 
14 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
10... 
0.10 
21 
96 
221 
30 
0.780 
0.020 
0.800 
0.050 
0.35 
DEC 
24... 
2 
0.700 
0.010 
0.710 
0.030 
0.37 
FEB 1986 
26... 
1 
0.290 
0.010 
0.300 
0.040 
0.26 
APR 
23... 
0.10 
23 
130 
48 
49 
0.780 
0.020 
0.800 
0.060 
0.34 
JUL 
17... 
21 
0.690 
0.010 
0.700 
0.040 
0.26 
SEP 
18... 
0.20 
27 
160 
30 
3 
<0.010 
0.200 
0.040 
0.36 
K = non-ideal count 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO GRANDE DE MANATI BASIN 
50035500 RIO GRANDE DE MANATI AT HIGHWAY 149 AT CIALES, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- PECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
10... 
0.40 
1.2 
5.3 
0.070 
<1 
<100 
40 
2 
12 
40 
DEC 
24... 
0.40 
1.1 
4.9 
0.060 
- 
FEB 1986 
26... 
0.30 
0.60 
2.7 
0.050 
- 
APR 
23... 
0.40 
1.2 
5.3 
0.100 
<1 
100 
<10 
<1 
22 
10 
JUL 
17... 
0.30 
1.0 
4.4 
0.070 
SEP 
18... 
0.40 
0.60 
2.7 
0.090 
MANGA- 
METHY- 
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
10... 
2700 
29 
80 
<0.10 
<1 
<1 
280 
<0.010 
3 
0.05 
DEC 
24... 
FEB 1986 
26... 
APR 
23... 
3800 
<1 
100 
<0.10 
<1 
<1 
10 
<0.010 
<1 
0.02 
JUL 
17... 
SEP 
18... 
102 
 
 
         
 
    
 
     
           
           
         
           
        
          
 
 
 
 
  
 
         
           
         
           
 
 
           
        
 
 
 
 
 
 
     
 
         
 
 
          
         
          
 
 
   
 
 
   
      
   
 
   
     
   
103 
RIO GRANDE DE MANATI BASIN 
50035950 RIO CIALITOS AT HIGHWAY 649 AT CIALES, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°20'18", long 66°28'28", 100 ft (30 m) upstream from bridge on Highway 649, 0.1 mi (1.1 km) 
upstream from mouth, and about 0.4 mi (0.6 km) west of Ciales plaza. 
DRAINAGE AREA.--17.0 sq mi (44.0 sq km). 
PERIOD OF RECORD.--Water years 1969-71, 1974 to current year. 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.1 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
10... 
1700 
52 
188 
8.00 
28.0 
9.0 
7.8 
101 
<10 
1000 
K1900 
DEC 
23... 
1545 
70 
229 
8.60 
23.0 
1.1 
8.6 
100 
<10 
470 
270 
FEB 1986 
26... 
1315 
14 
229 
8.70 
23.0 
1.4 
9.2 
107 
12 
APR 
23... 
1105 
23 
224 
8.20 
24.5 
7.2 
9.0 
109 
<10 
K1000 
650 
JUL 
17... 
1220 
37 
212 
8.05 
27.0 12 
8.5 
108 
<10 
2000 K110000 
SEP 
18... 
1315 
11 
244 
8.25 
28.0 
3.0 
8.8 
114 
22 
240 
360 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD-
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
10... 
67 
0 
18 
5.4 
11 
0.6 
2.2 
67 
<0.5 
9.5 
12 
DEC 
23... 
79 
FEB 1986 
26... 
90 
APR 
23... 
88 
6 
26 
5.7 
9.9 
0.5 
1.7 
82 
<0.5 
9.2 
9.2 
JUL 
17... 
86 
SEP 
18... 
100 
0 
30 
6.9 
11 
0.5 
1.6 
105 
6.6 
13 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2fNO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
10... 
0.10 
26 
120 
17 
45 
1.29 
0.010 
1.30 
0.040 
0.36 
DEC 
23... 
4 
<0.010 
0.900 
0.020 
0.28 
FEB 1986 
26... 
1 
<0.010 
0.500 
0.020 
0.28 
APR 
23... 
0.10 
25 
140 
8.4 
12 
<0.010 
0.700 
0.030 
0.37 
JUL 
17... 
19 
<0.010 
0.900 
0.040 
0.46 
SEP 
18... 
0.10 
31 
160 
5.0 
12 
<0.010 
0.500 
0.030 
0.27 
K = non-ideal count 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
RIO GRANDE DE MANATI BASIN 
50035950 RIO CIALITOS AT HIGHWAY 649 AT CIALES, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG,1 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS 8) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
10... 
0.40 
1.1 
7.5 
0.090 
<1 
100 
30 
1 
8 
20 
DEC 
23... 
0.30 
1.2 
5.3 
0.070 
FEB 1986 
26... 
0.30 
0.80 
3.5 
0.060 
APR 
23... 
0.40 
1.1 
4.9 
0.070 
1 
100 
20 
<1 
11 
<10 
JUL 
17... 
0.50 
1.4 
6.2 
0.080 
SEP 
18... 
0.30 
0.80 
3.5 
0.090 
MANGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
10... 
2200 
4 200 <0.10 
<1 
<1 160 <0.010 
2 0.05 
DEC 
23... 
FEB 1986 
26... 
APR 
23... 
720 
<1 
40 
<0.10 
<1 
<1 
10 
<0.010 
1 
0.02 
JUL 
17... 
SEP 
18... 
104 
I
I
I
I
I
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
105 
RIO GRANDE DE MANATI BASIN 
50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR 
LOCATION.--Lat 18°25'52", long 66°31'37", Hydrologic Unit 21010002, at bridge on Highway 2, and 2.3 mi (3.7 km) 
west of Manati. 
DRAINAGE AREA.--197 mil (510 km,), approximately, of which about 38 mi' (98 km') is partly or entirely 
noncontributing, excludes 6.0 it (15.5 kmt) upstream from Lago El Guineo and Lago de Matrullas. 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--1963-68 (annual maximum discharge only), February 1970 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 14 ft (4 m), from topographic map. Prior to 1968 crest-stage 
gage at same site ard datum 3.57 ft (1.088 ) lower. 
REMARKS.--Estimated daily discharges: Dec. 25-30. Records fair except those for estimated daily discharges. 
which are poor. 
AVERAGE DISCHARGE.--16 years (1971-86), 397 ft3/s (11.24 
3/s), 27.36 in/yr (695 mm/yr), 287,600 acre-ft/yr 
(355 hm 3/yr); median of yearly mean discharges, 370 ft3/s (10.5 0/s), 269,000 acre-ft/yr (330 hm 3/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 97,200 ft3/s (2,750 0/s), Oct. 7, 1985, gage height, 
33.79 ft (10.299 m) from rating curve extended above 15,000 ft3/s (425 m 3/s) on basis of slope-area 
measurements of peak flow; minimum discharge, 33 ft3/s (0.935 0/s), May 12, 1984. 
EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate gage heights to gage datum of major floods, pointed out by local 
residents, are as follows: Sept. 13. 1928, 36.6 ft (11.16 ), Sept. 27, 1932, 36.3 ft (11.06 m), and 
Aug. 4, 1945, 34.3 ft (10.45 m). 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 9,000 ft3/s (255 3/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft3/s) 
(m 3/s) 
(ft) 
(m) 
Date 
Time 
(ft3/s) 
(0/s) 
(ft) 
(m) 
Oct. 7 
0515 
*97,200 
2,750 
*33.79 10.299 
May 2 
2115 
16,100 
456 
29.02 
8.845 
Nov. 15 
0400 
9,260 
262 
27.68 
8.437 
May 13 
1145 
40,100 
1,140 
31.57 
9.622 
Nov. 16 
0045 
9,340 
264 
27.72 
8.449 
May 14 
0115 
71,500 
2,020 
32.97 10.049 
Apr. 30 
2245 
11,500 
326 
28.30 
8.626 
Minimum discharge, 88 ft3/s (2.492 0/s), Mar. 23, 24. 
REVISIONS.--The peak discharges and annual maximum (*) reported for some water years have been revised as shown in 
the following table. They supersede figures published in the reports for 1970, 1971, 1975-76, 1979-80, 1981-82, 
1983, 1984 and 1985. 
Water 
Discharge 
Gage height 
Water 
Discharge 
Gage height 
Year 
Date 
(ft3/s) 
(m 3/s) 
(ft) 
(m) 
Year 
Date 
(ft3/s) (0/s) 
(ft) 
(m) 
1970 Nov. 9, 1969 *68,100 
1,930 
32.85 10.013 
Sept.13, 1982 
21,200 
600 
29.96 
9.132 
1971 Oct. 9, 1970 *81,800 
2,360 
33.30 10.150 
1983 Apr. 21, 1983 *30,200 
855 
30.84 
9.400 
1975 Oct. 23, 1974 
21,000 
595 
29.92 
9.120 
May 14, 1983 
18,700 
530 
29.52 
8.998 
Sept.16, 1975 *21,400 
606 
29.99 
9.141 
1984 Sept.11, 1984 
8,600 
244 
27.36 
8.339 
1979 July 19, 1979 
19,000 
538 
29.57 
9.013 
1985 Nov. 3, 1984 
17,300 
490 
29.26 
8.918 
Aug. 31. 1979 *34,500 
977 
31.18 
9.504 
May 17, 1985 
37,300 
1,060 
31.38 
9.565 
1982 Dec. 13, 1981 *31,000 
878 
30.91 
9.421 
May 18, 1985 *90,000 
2,550 
33.54 10.223 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
106 
RIO GRANDE DE MANATI BASIN 
50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR--Continued 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
2 
3 
4 
5 
201 
286 
201 
169 
259 
585 
515 
529 
675 
616 
393 
372 
347 
335 
324 
181 
178 
175 
177 
173 
165 
165 
358 
339 
476 
111 
110 
108 
109 
107 
99 
99 
151 
547 
1360 
3700 
4640 
2840 
1300 
2310 
434 
354 
327 
304 
290 
157 
155 
154 
151 
147 
186 
168 
158 
158 
163 
463 
739 
327 
296 
193 
6 
7 
8 
9 
10 
3040 
48600 
7170 
1950 
1190 
576 
675 
476 
417 
396 
340 
314 
298 
291 
284 
171 
170 
164 
181 
210 
283 
197 
169 
154 
144 
105 
103 
103 
102 
104 
1070 
387 
741 
2300 
482 
1610 
1140 
1760 
3070 
2010 
276 
266 
382 
350 
288 
160 
186 
220 
158 
151 
152 
147 
145 
148 
142 
164 
147 
138 
138 
139 
11 
12 
13 
14 
15 
928 
795 
653 
557 
509 
399 
504 
854 
1240 
7140 
285 
281 
274 
258 
254 
172 
160 
157 
150 
145 
139 
133 
130 
127 
126 
105 
103 
101 
104 
110 
325 
233 
186 
159 
143 
2930 
1490 
13300 
21100 
2340 
293 
274 
262 
254 
236 
150 
153 
140 
134 
438 
139 
138 
169 
203 
166 
135 
132 
133 
130 
125 
16 
17 
18 
19 
20 
447 
414 
414 
407 
370 
6510 
2530 
2090 
1150 
894 
252 
247 
239 
231 
229 
151 
167 
173 
143 
144 
126 
123 
129 
121 
122 
108 
99 
103 
102 
103 
140 
287 
284 
339 
248 
1340 
1040 
994 
772 
652 
235 
218 
209 
206 
201 
466 
271 
210 
169 
154 
152 
146 
136 
131 
130 
120 
118 
117 
115 
112 
21 
22 
23 
24 
25 
363 
329 
314 
984 
850 
1090 
818 
676 
596 
549 
222 
220 
215 
208 
204 
153 
155 
152 
148 
165 
150 
127 
115 
111 
114 
99 
93 
90 
92 
106 
711 
452 
333 
266 
228 
583 
540 
494 
470 
448 
194 
188 
185 
181 
175 
146 
137 
133 
135 
362 
128 
128 
130 
191 
313 
111 
115 
121 
116 
119 
26 
27 
28 
29 
30 
31 
1540 
2560 
1190 
1220 
712 
720 
512 
473 
445 
425 
413 
---
200 
195 
191 
185 
182 
181 
562 
233 
178 
162 
154 
180 
115 
113 
111 
---
102 
99 
96 
107 
125 
104 
176 
155 
155 
433 
2610 
---
449 
477 
575 
807 
582 
433 
171 
173 
169 
162 
157 
---
206 
179 
179 
201 
279 
205 
186 
149 
464 
720 
519 
311 
123 
114 
129 
124 
112 
---
TOTAL 
MEAN 
MAX 
MIN 
CFSM 
IN. 
AC-FT 
79342 
2559 
48600 
169 
13.0 
14.98 
157400 
34768 
1159 
7140 
396 
5.88 
6.57 
68960 
8051 
260 
393 
181 
1.32 
1.52 
15970 
5584 
180 
562 
143 
.91 
1.05 
11080 
4682 
167 
476 
111 
.85 
.88 
9290 
3213 
104 
125 
90 
.53 
.61 
6370 
15099 
503 
2610 
99 
2.55 
2.85 
29950 
76196 
2458 
21100 
433 
12.5 
14.39 
151100 
7414 
247 
434 
157 
1.25 
1.40 
14710 
6086 
196 
466 
133 
.99 
1.15 
12070 
6316 
204 
720 
128 
1.04 
1.19 
12530 
5165 
172 
739 
111 
.87 
.98 
10240 
CAL YR 1985 
WTR YR 1986 
TOTAL 
TOTAL 
272646 
251916 
MEAN 
MEAN 
747 
690 
MAX 
MAX 
55900 
48600 
MIN 
MIN 
80 
90 
CFSM 
CFSM 
3.79 
3.50 
IN, 
IN. 
51.48 
47.57 
AC-FT 
AC-FT 
540800 
499700 
 
 
         
 
    
 
     
         
       
  
          
           
           
 
 
   
 
 
 
 
  
 
          
         
           
         
        
  
           
           
           
           
           
 
 
 
    
     
  
 
 
    
 
          
     
     
           
           
           
          
  
 
107 
RIO GRANDE DE MANATI BASIN 
50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR--Continued 
(National stream-quality accounting network station) 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1969 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TTlE TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
11... 
1215 
1020 
205 
8.10 
26.5 
100 
8.3 
103 
70000 
DEC 
04... 
1445 
334 
247 
7.80 
25.5 
48 
<10 
3800 
3700 
FEB 1986 
6... 
1135 
279 
247 
7.85 
22.5 
35 
8.1 
94 
22 
K7400 
3000 
APR 
02... 
1350 
97 
320 
7.80 
27.0 
1.7 
9.5 
88 
28 
2000 
K730 
JUN 
05... 
1055 
293 
312 
7.69 
27.0 
6.5 
7.2 
90 
13 
K10000 
600 
AUG 
29... 
1030 520 
219 7.67 27.0 89 
6.4 
80 
14 K12000 K14000 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO- FLUO-
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD-
SLUM, WATER SULFATE RIDE, 
RIDE, 
NESS 
WATER 
DIS-
DIS-
DIS-
SORP-
DIS-
TOTAL 
DIS-
DIS-
DIS-
(MG/L 
TOT FLO 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
SOLVED 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS 504) 
AS CL) 
AS F) 
OCT 1985 
11... 
8d 
10 
26 
5.5 
8.5 
0.4 
1.7 
8.9 
9.2 
<0.10 
DEC 
04... 
120 
4 
35 
7.6 
11 
0.5 
2.0 
115 
9.3 
13 
0.10 
FEB 1986 
06... 
100 
6 
28 
7,3 
9.0 
0.4 
1.9 
94 
9.5 
11 
0.20 
APR 
02... 
130 
17 
41 
7.9 
11 
0.4 
2.3 
118 
10 
13 
0.20 
JUN 
05... 
130 
1 
41 
7.7 
11 
0.4 
2.2 
133 
8.8 
13 
0.20 
AUG 
29... 
91 
6 
27 
5.7 
10 
0.5 
2.7 
88 
9.1 
9.3 
0.10 
SOLIDS, SOLIDS, 
SOLIDS, NITRO- NITRO- NITRO- NITRO-
SILICA 
RESIDUE SUM OF 
SOLIDS, RESIDUE 
GEN, 
GEN, 
GEN, 
GEN,AM-
DIS-
AT 180 
CONSTI-
DIS-
AT 105 
NO2+NO3 AMMONIA AMMONIA MONIA + 
PHOS-
PHOS-
SOLVED 
DEG. C TUENTS, 
SOLVED DEG. C, 
DIS-
DIS-
DIS-
ORGANIC PHORUS, 
PHORUS 
(MG/L DIS- DIS- (TONS SUS- SOLVED SOLVED SOLVED TOTAL TOTAL TOTAL 
DATE AS SOLVED SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L 
SI02) 
(MG/L) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS NH4) 
AS N) 
AS P) 
AS PO4) 
OCT 1985 
11... 
19 -
132 
130 
362 
0.800 
0.080 
0.10 
0.40 
0.260 
0.80 
DEC 
04... 
22 
162 
170 
146 
19 
0.780 
0.070 
0.09 
0.50 
0.080 
0.25 
FEB 1986 
06... 
21 
149 
150 
112 
24 
0.980 
0.090 
0.12 
0.80 
0.110 
0.34 
APR 
02... 
17 
206 
170 
54 
12 
0.590 
0.030 
0.04 
0.40 
0.140 
0.43 
JUN 
5... 
20 
184 
180 
146 
28 
0.650 
0.060 
0.08 
0.30 
0.110 
0.34 
AUG 
29... 
18 
164 130 230 
62 0.880 0.200 0.26 0.50 0.170 0.52 
K = non-ideal count 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO GRANDE DE MANATI BASIN 
50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR--Continued 
(National stream-quality accounting network station) 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
PROS- 
PHDS- 
PHOS- PHORUS, PRATE, ALUM- 
BERYL- 
CHRO- 
PHORUS, ORTHO, ORTHO, INUM, ARSENIC BARIUM, LIUM, CADMIUM MIUM, COBALT, COPPER, 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- 
D1S- 
D1S- 
DIS- 
DIS- 
DIS- 
SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED 
DATE 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS P) 
AS P) 
AS PO4) 
AS AL) 
AS AS) 
AS BA) 
AS BE) 
AS CD) 
AS CR) 
AS CO) 
AS CU) 
OCT 1985 
11... 
0.040 
0.030 
0.09 
40 
<1 
47 
<0.5 
<1 
<1 
<3 
7 
DEC 
4... 
0.050 
0.050 
0.15 
FEB 1986 
06... 
0.090 
0.090 
0.28 
70 
1 
44 
,0.5 
<1 
<1 
<3 
3 
APR 
02... 
0.090 
0.090 
0.28 
- 
JUN 
5... 
0.040 
0.040 
0.12 
10 
<1 
51 
<0.5 
<1 
<1 
<3 
3 
AUG 
29... 
0.110 
0.070 
0.21 
80 
1 
39 
<0.5 
2 
<1 
<3 
11 
MANGA- 
MOLYB- 
SELE- 
STROM- VANA- 
IRON, LEAD, LITHIUM NESE, MERCURY DENUM, NICKEL, NIUM, SILVER, TIUM, DIUM, 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- 
SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS FE) 
AS PB) 
AS LI) 
AS MN) 
AS HG) 
AS MO) 
AS NI) 
AS SE) 
AS AG) 
AS SR) 
AS V) 
OCT 1985 
11... 
29 
<1 
<4 
41 
<0.1 
<10 
2 
<1 
<1 
120 
<6 
DEC 
4... 
- 
FEB 1986 
6... 
72 
<1 
<4 
16 
4.1 
<10 
7 
<1 
<1 
150 
<6 
APR 
02... 
JUN 
5... 
9 
<1 
<4 
44 
0.5 
<10 
<1 
<1 
<1 
170 
<6 
AUG 
29... 
130 
<5 
8 
26 
2.5 
<10 
4 
<1 
<1 
140 
<6 
PESTICIDE ANALYSES 
CHLOR- 
DI- 
DI- 
PCB, 
ALDRIN, 
DANE, 
DDD, 
DOE, 
DDT, 
AZINON, 
ELDRIN 
DATE 
TIME 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUN 1986 
05... 
1055 
<0.1 
<0.010 
<0.1 
<0.010 
<0.010 
<0.010 
<0.01 
<0.010 
HEPTA- 
METH- 
ENDO- 
HEPTA- CHLOR 
MALA- OXY- 
SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, 
DATE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
JUN 1986 
05... 
<0.010 
<0.010 
<0.01 
<0.010 
<0.010 
<0.010 
<0.01 
<0.01 
NAPH- 
THA- 
METHYL METHYL 
LENES, 
PARA- 
TRI- 
PARA- 
POLY- 
PER- 
TOX- 
TOTAL 
THION, 
THION, 
MIREX, 
THION, 
CHLOR. 
THANE 
APHENE, 
IRI- 
DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUN 1986 
05... 
<0.01 
<0.01 
<0.01 
<0.01 
<0.10 
<0.1 
<1 
,0.01 
108 
 
 
   
   
109 
RIO GRANDE DE MANATI BASIN 
50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR--Continued 
(National stream-quality accounting network station) 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT 
SED. 
SEDI-
SUSP. 
MENT, 
SIEVE 
STREAM-
SEDI-
DIS-
DIAM. 
FLOW, MENT, CHARGE, PERCENT 
INSTAN- SUS- SUS- FINER 
DATE TIME TANEOUS PENDED PENDED THAN 
(CFS) 
(MG/L) 
(T/DAY) 
.062 MM 
DEC 1985 
04... 
1445 
400 
60 
65 
82 
FEB 1986 
06... 
1135 
304 
128 
105 
83 
JUN 
05... 
1055 
329 
100 
89 
89 
AUG 
29... 
1100 
478 
235 
303 
65 
 
 
 
 
  
 
 
 
  
 
  
 
  
 
 
 
 
 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
110 
LAGUNA TORTUGUERO BASIN 
50038200 LAGUNA TORTUGUERO OUTLET NEAR VEGA RAJA, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18'28'29", long 66°26'50", at bridge on Highway 686, 4.2 mi (6.8 km) northeast of Manati, and 
4.4 mi (7.1 km) northwest of Vega Baja plaza. 
DRAINAGE AREA.--Indeterminate. 
PERIOD OF RECORD.--Water years 1964-66, 1969-71, 1974 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
NOV 1985 
01... 
1145 
37 
1300 
7.80 
28.5 
52 
43 
K27 
DEC 
18... 
0950 
33 
1140 
8.10 
26.0 
<10 
K7 
K20 
FEB 1986 
06... 
1645 
25 
1250 
8.20 
27.5 
8.7 
111 
36 
K31 
K990 
APR 
22... 
1005 
24 
1610 
8.01 
29.0 
8.0 
105 
39 
K15 
K120 
JUL 
1... 
1405 
22 
1110 
8.20 
30.5 
7.3 
97 
25 
K6 
K10 
SEP 
2... 
1515 
27 
1350 
7.85 
30.5 
8.3 
112 
30 
K8 
68 
ALKA- 
SOLIDS, 
NITRO- 
LINITY 
RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- 
WATER 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
MONIA + 
NITRO- 
TOTAL 
SULFIDE DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC )RGANIC 
GEN, 
FIELD 
TOTAL 
SUS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
DATE 
MG/L AS 
(MG/L 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
CAC03 
AS S) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
NOV 1985 
01... 
139 
<0.5 
14 
0.880 
0.020 
0.900 
0.420 
0.68 
1.1 
2.0 
DEC 
18... 
157 
4 
1.27 
0.030 
1.30 
0.310 
0.69 
1.0 
2.3 
FEB 1986 
06... 
142 
9 
0.880 
0.020 
0.900 
0.210 
0.69 
0.90 
1.8 
APR 
22... 
115 
<0.5 
2 
0.870 
0.030 
0.900 
0.120 
0.68 
0.80 
1.7 
JUL 
1... 
119 
4 
0.680 
0.020 
0.700 
0.130 
0.77 
0.90 
1.6 
SEP 
2... 
116 
2 
0.580 
0.020 
0.600 
0.180 
0.92 
1.1 
1.7 
MANGA- 
METHY- 
BORON, COPPER, IRON, NESE, ZINC, 
LENE 
NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL 
BLUE 
GEN, PHORUS, RECOV- RECOV- RECOV- RECOV- RECOV- CYANIDE 
ACTIVE 
TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS NO3) 
AS P) 
AS B) 
AS CU) 
AS FE) 
AS MN) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
NOV 1985 
01... 
8.9 
0.010 
70 
10 
160 
20 
50 
<0.010 
8 
0.11 
DEC 
18... 
10 
0.020 
FEB 1986 
06... 
8.0 
0.010 
APR 
22... 
7.5 
<0.010 
90 
<10 
140 
10 
60 
<0.010 
2 
0.13 
JUL 
1... 
7.1 
0.010 
-- 
SEP 
2... 
7.5 
<0.010 
K = non-ideal count 
    
 
     
 
111 
82 
039750 
Loguno Tor 
0395. 
0397 
y039650 
DORADO . 
VEGA BAJA 
TOA BAJA 
• 70 
a 
MAN AT 
a 
212 
QGA ALTA 
.213 
Drainage boundaries indeterminate 
in limestone terrane 
TOA ALTA 
a 
Limestone 
Igneous and 
sedimentary rocks 
CIALES 
a 
aNARANJITO 
Grande de Moriati'besoi 
Drainage boundary 
Plot0 balin 
EXPLANATION 
A 038320 SURFACE-WATER STATION AND NUMBER 
V 0397 QUALITY-OF-WATER STATION AND NUMBER 
0213 
WELL AND WELL NUMBER 
v- Mop aria 
0 
1 
2 
3 4 
5 KILOMETERS 
i 
l 
0 
i 
2 
3 
4 
5 MILES 
Figure 15.--Rio Cibuco basin. 
  
  
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
  
 
  
112 
RIO CIBUCO BASIN 
50038320 RIO CIBUCO BELOW COROZAL, PR 
LOCATION.--Lat 18°21'13", long 66°20'07", Hydrologic Unit 21010001, on right bank, 150 ft (46 m) downstream from 
Rio Corozal, and 1.4 mi (2.3 km) northwest of Corozal. 
DRAINAGE AREA.--15.1 EP (39.1 km 2 ). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--May 1969 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 195 ft (59 m), from topographic map. 
REMARKS.--Estimated daily discharges: Oct. 8, 9 and May 12-15. Records fair except those for estimated daily 
discharges, which are poor. 
AVERAGE DISCHARGE.--17 years (1970-86). 29.6 ft'/s (0.838 80/s), 26.62 in/yr (676 mm/yr). 21,440 acre-ft/yr 
(26.4 he/yr); median of yearly mean discharges, 32 ft'is (0.91 m 3/s), 23,200 acre-ft/yr (29 hm,/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,600 ft'/s (385 m 3 /s). Nov. 7, 1979, gage height, 19.80 ft 
(6.035 m), from rating curve extended above 100 ft'is (2.83 m'is) on basis of float and slope-area measurements 
of peak flow; minimum daily discharge, 1.3 ft'is (0.037 e/s), July 24-26, 1977. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ft'/s (70.8 10/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft'/s) 
($1 3/s) 
(ft) 
(a) 
Date 
Time 
(ft0/s) 
(m'/s) 
(ft) 
(m) 
Oct. 6 
1645 
3,130 
88.6 
11.65 3.551 
Nay 
1 
1730 
4,330 
123 
13.09 3.990 
Oct. 7 
0045 
4,310 
122 
13.07 3.984 
May 
9 
1700 
8,530 
242 
16.92 5.157 
Nov. 15 
1800 
2,730 
77.3 
11.11 3.386 
May 13 
0700 
9,680 
274 
17.78 5.419 
Apr. 8 
1445 
3,560 
101 
12.19 3.716 
May 13 
2230 
*11,000 
312 
*18.71 5.703 
Apr. 30 
1400 
3,290 
93.2 
11.85 3.612 
Minimum discharge, 4.6 ft'is (0.130 m'/s), Apr. 2. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
2 
3 
4 
5 
29 
22 
18 
33 
66 
30 
27 
37 
80 
37 
35 
34 
34 
34 
35 
17 
17 
19 
18 
15 
12 
16 
21 
26 
26 
9.7 
8.1 
8.5 
8.9 
8.3 
6.5 
5.7 
24 
78 
205 
481 
109 
90 
253 
94 
30 
28 
27 
25 
23 
14 
13 
15 
13 
15 
9.6 
8.4 
8.9 
8.4 
9.4 
157 
53 
30 
22 
19 
6 
7 
8 
9 
10 
529 
1210 
110 
60 
44 
30 
27 
25 
24 
24 
31 
30 
29 
29 
28 
14 
14 
13 
34 
19 
15 
13 
12 
11 
11 
7.5 
7.2 
7.4 
7.5 
7.8 
37 
20 
250 
60 
29 
65 
111 
122 
544 
102 
22 
21 
20 
20 
20 
18 
13 
13 
11 
11 
7.7 
8.3 
7.7 
6.7 
6.1 
17 
14 
13 
12 
12 
11 
12 
13 
14 
15 
38 
33 
30 
31 
29 
31 
118 
93 
301 
752 
28 
28 
26 
24 
25 
14 
12 
13 
12 
12 
12 
11 
11 
11 
11 
7.8 
7.1 
7.5 
8.6 
7.5 
23 
14 
12 
11 
9 0 
83 
49 
1640 
380 
100 
19 
26 
22 
19 
20 
17 
13 
10 
14 
73 
7.8 
6.8 
23 
15 
10 
12 
12 
12 
11 
9.9 
16 
17 
18 
19 
20 
24 
22 
52 
39 
66 
216 
124 
80 
64 
73 
25 
25 
23 
23 
22 
13 
14 
13 
12 
12 
11 
11 
11 
11 
13 
6.5 
6.7 
6.5 
7.2 
7.1 
8.9 
8.8 
9.0 
8.5 
22 
56 
46 
49 
37 
32 
20 
18 
17 
17 
16 
36 
30 
16 
13 
13 
7.4 
6.7 
6.1 
6.4 
6.4 
9.8 
10 
9.9 
9.5 
9.9 
21 
22 
23 
24 
25 
28 
27 
71 
64 
38 
64 
52 
49 
46 
43 
22 
22 
21 
20 
19 
13 
12 
13 
14 
37 
12 
11 
10 
10 
9.2 
6.8 
6.8 
6.4 
8.7 
8.5 
62 
30 
15 
12 
10 
33 
29 
26 
25 
23 
15 
15 
14 
15 
14 
12 
11 
11 
11 
12 
5.8 
5.8 
11 
20 
13 
18 
25 
14 
13 
16 
26 
27 
28 
29 
30 
31 
136 
181 
105 
56 
41 
35 
42 
39 
38 
39 
39 
---
20 
19 
19 
18 
17 
17 
26 
14 
12 
12 
11 
12 
9.5 
8.9 
9.2 
---
7.5 
6.9 
6.3 
6.8 
6.6 
6.8 
9.6 
9.2 
11 
131 
209 
---
22 
84 
46 
70 
42 
35 
14 
15 
13 
12 
13 
---
11 
13 
11 
9.7 
9.8 
9.1 
7.2 
6.2 
126 
115 
36 
25 
11 
13 
12 
11 
11 
---
TOTAL 
MEAN 
MAX 
MIN 
CFSM 
IN. 
AC-FT 
3267 
105 
1210 
18 
6.95 
8.05 
6480 
2704 
90.1 
752 
24 
5.97 
6.66 
5360 
782 
25.2 
35 
17 
1.67 
1.93 
1550 
483 
15.6 
37 
11 
1.03 
1.19 
958 
355.8 
12.7 
26 
8.9 
.84 
.88 
706 
231.5 
7.47 
9.7 
6.3 
.49 
.57 
459 
1340.2 
44.7 
250 
5.7 
2.96 
3.30 
2660 
4878 
157 
1640 
22 
10.4 
12.02 
9680 
572 
19.1 
30 
12 
1.26 
1.41 
1130 
491.6 
15.9 
73 
9.1 
1.05 
1.21 
975 
547.8 
17.7 
126 
5.8 
1.17 
1.35 
1090 
599.0 
20.0 
157 
9.5 
1.32 
1.48 
1190 
CAL YR 1985 
WTR YR 1986 
TOTAL 
TOTAL 
16072.9 
16251.9 
MEAN 
MEAN 
44.0 
44.5 
MAX 
MAX 
2370 
1640 
MIN 
MIN 
4.9 
5.7 
CFSM 
CFSM 
2.91 
2.95 
IN. 
IN. 
39.60 
40.04 
AC-FT 
AC-FT 
31880 
32240 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
  
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO CIBUCO BASIN 
50038320 RIO CIBUCO BELOW COROZAL, PR--Continued 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1969-76, 1979 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) (US/CM) UNITS) (DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
16... 
1110 
24 
344 
7.80 
24.5 
3.0 
12 
K710 
320 
DEC 
06... 
1025 
32 
317 
7.80 
22.5 
7.0 
<10 
4900 
2600 
FEB 1986 
04... 
1100 
15 
316 
8.20 
22.0 
25 
8.4 
98 
36 
5000 
2000 
APR 
17... 
1110 
10 
400 
7.96 
26.0 
21 
7.4 
92 
27 
K1100 
JUL 
03... 
0920 
17 
320 
7.75 
26.5 
3.0 
7.4 
92 
<10 
K730 
700 
SEP 
19... 
0957 
11 
393 
7.70 
25.5 
3.8 
7.6 
94 
37 
K750 
370 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- 
NONCARB CALCIUM 
SLUM, SODIUM, 
AD- 
SIUM, WH WAT 
SULFATE 
RIDE, 
NESS 
WH WAT 
DIS- 
DIS- 
DIS- 
SORP- 
DIS- 
TOTAL 
SULFIDE 
DIS- 
DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
16... 
130 
14 
34 
12 
16 
0.6 
3.1 
120 
<0.5 
18 
22 
DEC 
06... 
112 
FEB 1986 
04... 
107 
APR 
17... 
130 
6 
31 
12 
19 
0.8 
3.8 
121 
<0.5 
15 
27 
JUL 
03... 
- 
117 
SEP 
19... 
130 
5 
35 
11 
18 
0.7 
3.2 
128 
17 
24 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
S102) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
16... 
0.10 
31 
210 
13 
4 
1.34 
0.160 
1.50 
0.660 
0.14 
DEC 
06... 
12 
1.37 
0.130 
1.50 
0.490 
0.41 
FEB 1986 
04... 
22 
1.51 
0.390 
1.90 
0.450 
0.95 
APR 
17... 
0.10 
30 
210 
6.0 
4 
0.780 
0.320 
1.10 
1.20 
0.50 
JUL 
03... 
11 
0.700 
0.200 
0.900 
0.530 
0.47 
SEP 
19... 
0.10 
32 
220 
6.2 
7 
0.760 
0.140 
0.900 
0.810 
1.1 
K = non-ideal count 
113 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
RIO CIBUCO BASIN 
50038320 RIO CIBUCO BELOW COROZAL, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA . 
NITRO 
NITRO- 
PROS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
16... 
0.80 
2.3 
10 
0.180 
<1 
<100 
30 
<1 
6 
<10 
DEC 
06... 
0.90 
2.4 
11 
0.130 
FEB 1986 
04... 
1.4 
3.3 
15 
0.500 
APR 
17... 
1.7 
2.8 
12 
0.270 
<1 
100 
20 
<1 
3 
20 
JUL 
03... 
1.0 
1.9 
8.4 
0.270 
SEP 
19... 
1.9 
2.8 
12 
0.440 
MANGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
16... 
300 
1 
50 
<0.10 
<1 
<1 
50 
<0.010 
2 
0.06 
DEC 
06... 
FEB 1986 
04... 
APR 
17... 
210 
1 
50 
<0.10 
<1 
<1 
50 
<0.010 
2 
0.06 
JUL 
03... 
SEP 
19,.. 
114 
I
I
I
I
 
 
 
 
 
 
  
    
    
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
  
 
 
115 
RIO CIBUCO BASIN 
50039500 RIO CIBUCO AT VEGA BAJA, PR 
LOCATION.--Lat 18°26'531, long 66°22'29', Hydrologic Unit 21010002, 0.6 mi (1.0 km) downstream from Rio Indio, 
and 0.8 mi (1.3 km) east of Vega Baja. 
DRAINAGE AREA.--99.1-mi' (256.7 km,), of which 25.4 mil (65.8 km2 ), does not contribute directly to surface 
runoff. 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--January 1973 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 7.79 ft (2.37 m) above mean sea level. 
REMARKS.--Estimated daily discharges: Jan. 25 to Feb. 7. Records fair except those for estimated daily discharges, 
which are poor. 
AVERAGE DISCHARGE.--13 years (1974-86), 128 fti/s (3.625 m'/s), 17.54 in/yr (446 mm/yr), 92,740 acre-ft/yr 
(114 hm'/yr); median of yearly mean discharges, 120 ft'/s (3.40 m'/s), 86,900 acre-ft/yr (107 hmYyr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 30,300 ft'is (858 m3 /s), Dec. 13, 1981, gage height, 18.84 ft 
(5.742 
), from rating curve extended above 3,000 ft'is (85.0 '/s) on the basis of indirect measurements; 
minimum discharge, 6.1 ft'is (0.173 
'/s), July 24, 25, 1977. 
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Dec. 11, 1965 reached a stage of 26.2 ft (7.99 m), datum unknown, 
discharge about 28,000 ft'is (793 10/s). 
EXTREMES FOR CURRENT '?EAR.--Peak discharges greater than base discharge of 3,200 ft'is (90.6 
'/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time (ft'/s) (m0/s) (ft) (m) 
Date Time (W/s) 
(10/s) 
(ft) (m) 
Oct. 7 
0615 *20,200 
572 
*17.98 5.480 
May 13 
1315 
14,200 
402 
17.48 5.328 
Nov. 15 
2230 
3,960 
112 
15.83 4.825 
Minimum discharge, 24 fe/s (0.680 m'/s), Mar. 31 to Apr. 1-3. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
77 
157 
145 
68 
56 
36 
26 
742 
150 
63 
33 
472 
2 
76 
131 
139 
70 
64 
35 
27 
1060 
130 
61 
32 
443 
3 
59 
129 
132 
65 
90 
34 
33 
913 
123 
65 
31 
216 
4 
53 
274 
129 
75 
115 
33 
116 
954 
111 
61 
35 
119 
5 
255 
342 
127 
65 
115 
34 
572 
498 
104 
59 
37 
92 
6 
704 
189 
134 
63 
60 
34 
242 
272 
98 
75 
33 
83 
7 
9710 
135 
118 
61 
56 
34 
80 
493 
93 
73 
31 
76 
8 
998 
118 
111 
61 
54 
33 
451 
612 
93 
71 
32 
68 
9 
409 
107 
113 
65 
50 
32 
403 
925 
93 
59 
30 
65 
10 
298 
105 
111 
127 
49 
35 
124 
872 
88 
55 
30 
52 
11 
222 
13' 
110 
79 
47 
35 
83 
549 
90 
66 
30 
47 
12 
170 
306 
109 
67 
45 
32 
54 
403 
93 
85 
40 
46 
13 
141 
491 
105 
64 
44 
32 
42 
4650 
116 
59 
73 
48 
14 
122 
706 
95 
63 
43 
34 
36 
2510 
90 
56 
142 
45 
15 
115 
2490 
92 
61 
42 
35 
33 
538 
118 
163 
69 
43 
16 
105 
2200 
91 
60 
41 
31 
31 
380 
118 
154 
51 
42 
17 
98 
671 
94 
67 
42 
28 
36 
321 
86 
119 
46 
42 
18 
148 
462 
89 
74 
42 
34 
53 
306 
81 
60 
42 
41 
19 
168 
384 
86 
64 
42 
31 
35 
254 
78 
45 
40 
40 
20 
229 
352 
83 
57 
43 
30 
82 
218 
74 
41 
40 
40 
21 
178 
398 
79 
56 
57 
29 
299 
206 
72 
38 
40 
47 
22 
105 
315 
80 
55 
41 
28 
260 
192 
68 
35 
40 
69 
23 
97 
288 
80 
55 
38 
27 
82 
173 
66 
35 
42 
84 
24 
333 
246 
76 
55 
37 
30 
51 
160 
65 
35 
119 
55 
25 
341 
220 
74 
175 
37 
45 
41 
150 
65 
47 
123 
61 
26 
424 
199 
73 
115 
37 
36 
35 
143 
63 
46 
50 
55 
27 
595 
184 
71 
56 
36 
31 
32 
186 
67 
35 
40 
49 
28 
399 
167 
74 
54 
35 
29 
39 
254 
66 
42 
302 
50 
29 
309 
164 
72 
54 
---
28 
227 
295 
61 
38 
399 
47 
30 
204 
160 
69 
53 
28 
488 
215 
59 
34 
191 
48 
31 
199 
---
67 
52 
26 
---
169 
---
34 
115 
TOTAL 
17341 
12221 
3028 
2156 
1458 
999 
4113 
19613 
2679 
1909 
2358 
2685 
MEAN 
559 
407 
97.7 
69.5 
52.1 
32.2 
137 
633 
89.3 
61.6 
76.1 
89.5 
MAX 
9710 
2490 
145 
175 
115 
45 
572 
4650 
150 
163 
399 
472 
MIN 
53 
105 
67 
52 
35 
26 
26 
143 
59 
34 
30 
40 
CFSM 
5.64 
4.11 
.99 
.70 
.53 
.32 
1.38 
6.39 
.90 
.62 
.77 
.90 
IN. 
6.51 
4.59 
1.14 
.81 
.55 
.38 
1.54 
7.36 
1.01 
.72 
.89 
1.01 
AC-FT 
34400 
24240 
6010 
4280 
2890 
1980 
8160 
38900 
5310 
3790 
4680 
5330 
CAL YR 1985 
TOTAL 
74652 
MEAN 
205 
MAX 
10800 
MIN 
32 
CFSM 
2.07 
IN. 
28.02 
AC-FT 
148100 
WTR YR 1986 
TOTAL 
70560 
MEAN 
193 
MAX 
9710 
MIN 
26 
CFSM 
1.95 
IN. 
26.49 
AC-FT 
140000 
 
 
         
 
    
 
     
 
 
 
 
 
 
  
 
         
           
         
           
 
 
           
         
 
 
 
     
         
 
 
          
         
          
 
     
 
     
          
     
  
116 
RIO CIBUCO BASIN 
50039500 RIO CIBUCO AT VEGA BAJA, PR--Continued 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1972 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
15... 
1230 
120 
440 
7.80 
25.5 
8.5 
10 
3900 
820 
DEC 
02... 
1330 
138 
406 
7.80 
24.5 
8.5 
7.8 
94 
<10 
2900 
320 
FEB 1986 
07... 
1145 
58 
390 
7.90 
23.0 
11 
4.9 
58 
14 
K1100 
520 
APR 
09... 
1625 
342 
7.68 
25.0 
95 
7.2 
87 
28 
K7900 
K12000 
JUL 
1... 
1115 
62 
409 
7.78 
28.5 
3.0 
4.2 
54 
<10 
K1700 
290 
SEP 
2... 
1115 
550 
342 
7.75 
24.5 
170 
6.8 
82 
18 
25000 
30000 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD-
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- D1S- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLO 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
15... 
210 
26 
68 
8.7 
13 
0.4 
2.9 
180 
<0.5 
18 
22 
DEC 
02... 
167 
FEB 1986 
07... 
151 
APR 
09... 
130 
26 
41 
7.2 
12 
0.5 
3.9 
106 
<0.5 
22 
17 
JUL 
1... 
167 
SEP 
2... 
140 
9 
47 
5.4 
9.1 
0.4 
4.5 
131 
14 
11 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GUI, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
15... 
0.20 
20 
260 
84 
9 
1.26 
0.040 
1.30 
0.120 
0.48 
DEC 
02... 
13 
1.36 
0.040 
1.40 
0.090 
0.41 
FEB 1986 
07... 
24 
1.44 
0.060 
1.50 
0.150 
0.45 
APR 
09... 
0.10 
15 
180 
0.0 
134 
1.64 
0.060 
1.70 
0.250 
0.75 
JUL 
1... 
12 
1.04 
0.060 
1.10 
0.200 
0.30 
SEP 
2... 
0.10 12 
180 270 
34 0.950 0.050 1.00 0.120 2.4 
K = non-ideal count 
 
 
    
    
 
          
         
          
    
    
          
   
   
  
 
        
          
        
  
   
 
       
  
 
 
117 
RIO CIBUCO BASIN 
50039500 RIO CIBUCO AT VEGA BAJA, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEM, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
YOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
15... 
0.60 
1.9 
8.4 
0.120 
<1 
<100 
40 
<1 
12 
10 
DEC 
02... 
0.50 
1.9 
8.4 
0.130 
FEB 1986 
07... 
0.60 
2.1 
9.3 
0.230 
APR 
09... 
1.0 
2.7 
12 
0.240 
1 
<100 
10 
<1 
20 
10 
JUL 
1... 
0.50 
1.6 
7.1 
0.200 
SEP 
2... 
2.5 
3.5 
15 
0.190 
MANGA-
METHY-
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
kECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
15... 
920 
2 100 <0.10 
<1 
<1 
20 <0.010 
<1 0.06 
DEC 
02... 
FEB 1986 
07... 
APR 
09... 
. 4700 
3 
210 
<0.10 
<1 
<1 
40 <0.010 
1 
0.06 
JUL 
1... 
SEP 
2... 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
RIO CIBUCO BASIN 
50039650 DRAINAGE DITCH BELOW WARNER LAMBERT LABORATORY NR SABANA, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18'27'17", long 66°21'09", 0.3 mile (0.5 km) northwest of Warner Lambert Laboratory, 0.6 mile 
(1.0 km) south of Sabana, and 1.1 miles (1.8 km) above confluence with Rio Cibuco. 
DRAINAGE AREA.--Indeterminate. 
PERIOD OF RECORD.--Water years 1982 to April 1986 (discontinued). 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIVIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
NOV 1985 
08... 
0905 
E3.0 
300 
6.40 
26.0 
11 
71 
K1500 
2000 
DEC 
18... 
1220 
E3.0 
718 
6.90 
25.5 
15 
35 
360 
K1200 
FEB 1986 
05... 
1510 
10.0 
440 
7.15 
25.5 
22 
2.4 
30 
54 
K1100 
3000 
APR 
22... 
1235 
E0.0 
494 
7.29 
27.5 
11 
1.2 
15 
40 
5300 
300 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD- 
SIUM, WATER 
SULFATE RIDE, 
NESS 
WATER 
DIS- 
DIS- 
DIS- 
SORP- 
DIS- 
TOTAL 
SULFIDE 
DIS- 
DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
NOV 1985 
08... 
73 
7 
21 
5.0 
31 
2 
4.3 
66 
<0.5 
13 
53 
DEC 
18... 
105 
FEB 1986 
05... 
101 
APR 
22... 
160 
13 
49 
9.1 
31 
1 
2.6 
147 
<0.5 
16 
42 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
D1S- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
D1S- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
NOV 1985 
08... 
0.10 
10 
180 
0.0 
18 
0.010 
<0.100 
0.090 
0.91 
DEC 
18... 
8 
0.010 
<0.100 
0.040 
0.96 
FEB 1986 
05... 
26 
0.190 
0.010 
0.200 
0.040 
1.2 
APR 
22... 
0.20 
10 
250 
0.0 
11 
0.060 
0.040 
0.100 
0.280 
0.62 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RLCOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
NOV 1985 
08... 
1.0 
DEC 
18... 
1.0 
FEB 1986 
05... 
1.2 
1.4 
6.2 
APR 
22... 
0.90 
1.0 
4.4 
K = non-ideal count 
0.100 
4 
<100 
110 
1 
6 
<10 
0.050 
0.140 
0.120 
1 
100 
100 
<1 
8 
<10 
118 
  
 
        
          
        
  
   
 
          
119 
RIO CIBUCO BASIN 
50039650 DRAINAGE DITCH BELOW WARNER LAMBERT LABORATORY NR SABANA, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MANGA-
METHY-
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UGiL 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
NOV 1985 
08... 
5000 
2 230 <0.10 
<1 
20 <0.010 
3 0.07
<1 
DEC 
18... 
FEB 1986 
05... 
APR 
22... 
1100 
1 
110 
<0.10 
<1 
<1 
20 
<0.010 
2 
0.08 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO CIBUCO BASIN 
50039700 DRAINAGE DITCH AT RIO CIBUCO BELOW CENTRAL SAN VICENTE, PR 
WATER-QUALITY RECORDS 
LOCATION.--tat 18'27'44", long 66°21'52", 60 ft (18 m), above corfluence with Rio Cibuco, 984 ft (300 m) east of 
Central San Vicente, and 0.7 mi (1.2 km) west of Sabana. 
DRAINAGE AREA.--Indeterminate. 
PERIOD OF RECORD.--Water years 1982 to April 1986 (discontinued). 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) (US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
25... 
1055 
30 
368 
7.00 
26.0 
21 
0.8 
10 
K1100 
20000 
DEC 
05... 
0945 
23 
606 
7.20 
24.5 
15 
30 
570 
6000 
FEB 1986 
07... 
1450 
14 
418 
7.70 
25.0 
14 
4.6 
56 
43 
330 
770 
APR 
21... 
1455 
-- 
480 
7.48 
27.0 
17 
4.7 
59 
39 
-- 
21... 
1455 
3.9 
480 
7.48 
27.0 
17 
4.7 
59 
39 
K1000 
3300 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM S1UM, SODIUM, 
AD- 
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CACO3 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
25... 
110 
0 
24 
12 
14 
0.6 
2.2 
109 
<C.5 
16 
20 
DEC 
05... 
143 
FEB 1986 
07... 
136 
APR 
21... 
-- 
-- 
-- 
170 
-- 
21... 
170 
1 
54 
8.7 
18 
0.6 
2.8 
170 
<0.5 
15 
32 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
25... 
<0.10 
24 
180 
14 
28 
1.17 
0.030 
1.20 
0.070 
0.33 
DEC 
05... 
26 
0.190 
0.010 
0.200 
0.050 
0.65 
FEB 1986 
07... 
30 
0.230 
0.070 
0.300 
0.510 
0.69 
APR 
21... 
31 
-- 
21... 
0.20 
15 
250 
2.6 
31 
0.080 
0.020 
0.100 
0.070 
0.83 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL . TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECGV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
25... 
0.40 
1.6 
7.1 
2.20 
<1 
<100 
70 
1 
5 
10 
DEC 
05... 
0.70 
0.90 
4.0 
0.080 
FEB 1986 
07... 
1.2 
1.5 
6.6 
0.090 
APR 
21...
-- 
21... 
0.90 
1.0 
4.4 
0.120 
2 
<100 
<10 
<1 
15 
10 
K = non-ideal count 
120 
  
 
        
          
        
   
   
 
  
   
 
121 
RIO CIBUCO BASIN 
50039700 DRAINAGE DITCH AT RIO CIBUCO BELOW CENTRAL SAN VICENTE, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MANGA-
METHY-
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
25... 
1400 
3 
80 <0.10 
<1 
1 
30 <0.010 
<1 0.06 
DEC 
05... 
FEB 1986 
07... 
APR 
21... 
--
21... 
770 
4 290 0.50 
<1 
<1 
20 <0.010 
2 0.05 
I
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO CIBUCO BASIN 
50039750 RIO CIBUCO BELOW CENTRAL SAN VICENTE, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18'27'47", long 66'21'53", at bridge on Highway 688, 1,000 ft (305 m) northeast of Central San 
Vicente, 0.8 mi (1.3 km) west of Sabana, and 1.3 i (2.1 ka) northwest of Warner Lambert Laboratory. 
DRAINAGE AREA.--Indeterminate. 
PERIOD OF RECORD.--Water years 1982 to April 1986 (discontinued). 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN 
COLI- 
STREP- 
STREAM- 
FLOW, 
INSTAN- 
SPE- 
CIFIC 
CON- 
DUCT- 
PH 
(STAND- 
TEMPER- 
ATURE 
TUR- 
BID- 
OXYGEN, 
DIS- 
DIS- 
SOLVED 
(PER- 
CENT 
DEMAND, 
CHEM- 
ICAL 
(HIGH 
FORM, 
FECAL, 
0.7 
UM-MF 
TOCOCCI 
FECAL, 
KF AGAR 
(COLS. 
DATE 
TIME 
TANEOUS 
ANCE 
ARD 
WATER 
ITY 
SOLVED 
SATUR- LEVEL) 
(COLS./ 
PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
NOV 1985 
01... 
1445 
211 
389 
7.80 
26.0 
36 
27 
2300 
500 
DEC 
06... 
1415 
124 
475 
7.70 
24.5 
13 
52 
K1500 
500 
FEB 1986 
04... 
1450 
68 
406 
7.80 
22.5 
35 
7.0 
82 
20 
2400 
4100 
APR 
21... 
1150 
144 
366 
7.72 
26.0 
41 
6.6 
81 
39 
28000 
27000 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM S1UM, SODIUM, 
AD- 
SLUM, WATER 
SULFATE RIDE, 
NESS 
WATER 
DIS- 
DIS- 
DIS- 
SORP- 
DIS- 
TOTAL 
SULFIDE 
DIS- 
DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
NOV 1985 
01... 
170 
20 
54 
8.0 
15 
0.5 
2.8 
148 
<0.5 
19 
24 
DEC 
06... 
157 
FEB 1986 
04... 
- 
144 
APR 
21... 
140 
13 
44 
6.4 
12 
0.5 
5.0 
123 
<0.5 
34 
16 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
NOV 1985 
01... 
0.10 
17 
230 
130 
180 
0.860 
0.040 
0.900 
0.120 
0.78 
DEC 
06... 
-- 
22 
1.07 
0.030 
1.10 
0.050 
0.65 
FEB 1986 
04... 
-- 
43 
0.850 
0.050 
0.900 
0.110 
0.69 
APR 
21... 
0.20 
14 
210 
80 
60 
1.33 
0.070 
1.40 
0.190 
0.91 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
NOV 1985 
01... 
0.90 
1.8 
8.0 
0.140 
2 
<100 
30 
<1 
20 
20 
DEC 
06... 
0.70 
1.8 
8.0 
0.100 
FEB 1986 
04... 
0.80 
1.7 
7.5 
0.200 
APR 
21... 
1.1 
2.5 
11 
0.290 
1 
100 
10 
<1 
16 
10 
K = non-ideal count 
122 
  
 
        
          
        
  
   
 
  
   
 
123 
RIO CIBUCO BASIN 
50039750 RIO CIBUCO BELOW CENTRAL SAN VICENTE, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
DATE 
MANGA-
METHY-
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
(UG/L 
(UG/L 
(0G/L, 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
NOV 1985 
01... 
DEC 
06... 
FEB 1986 
04... 
APR 
21... 
4200 
1900 
5 170 <0.10 
6 120 <0.10 
<1 
<1 
<1 
<1 
70 <0.010 
30 <0.010 
<1 0.05 
<1 0.06 
 
 
 
 
 
 
125 
.214 
ATLANTIC 
C E 
N 
DORADO 
• 215 
k 
AJA> 
CATAKi0 
VEGA ALTA 
N 
Drainage boundaries indeterminate 
in limestone terrone 
TOA ALTA 
Limestone 
Igneous and sedimentary rocks 
▪BAYAMON 
i...+mestone 
Igneous and "s\ 
sedimentary rocks 
(-N 
\ 
OR OZ AL 
EC 
—Map area 
SAN JV AN 
044 50 
6 NARANJI TO 
AYASVSZ 
FA4ANDO 
„CANVAS 
YANA 
Drainage bound° 
yarndn basin 
COMERIO 
Rib Grande ae Mcmotl. basin 
island 
r divide 
BARRANOUITAS 
La Plot 
Grand* 
de Loi-za basin 
A BONITO 
R`o Caarno basin 
AYEY 
't Island 
divide 
EXPLANATION 
A0469 SURFACE—WATER 
STATION AND NUMBER 
-0430 QUALITY—OF—WATER
STATION AND NUMBER 
D0399 QUALITY—OF—WATER 
PARTIAL RECORD 
STATION AND NUMBER 
4,216 
WELL AND WELL NUMBER 
f2ia Grande 
de Patitios 
basin 
Turoe!ituodirani 
Figure 16.--Rio de la Plata basin. 
  
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
  
 
126 
RIO DE LA PLATA BASIN 
50043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR 
LOCATION.--Lat 18'09'37', long 66° 13'44", Hydrologic Unit 21010005, at upstream side of bridge on Highway 173, 
0.4 mi (0.6 km) northeast of Proyecto La Plata, and 2.5 mi (4.0 km) upstream from Rio Usabon. 
DRAINAGE AREA.--54.8 mil (141.9 km 2), excludes 8.2 mi 2 (21.1 km 2 ) upstream from Carite Reservoir, the flow of 
which is diverted to Rio Guamani. 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--1958 (occasional measurements only), February 1959 to March 1960 (monthly measurements only), 
April 1960 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 850 ft (259 m), from topographic map. Prior to Mar. 29, 1961, 
wire-weight gage read twice daily at same site and datum. 
REMARKS.--Estimated daily discharges: Oct. 6-17. Apr. 10-14, June 2-6, Aug. 19-22 and Aug. 29, 30. Records fair 
except those for estimated daily discharges, which are poor. The Puerto Rico Aqueduct and Sewer Authority 
operates a pumping plant about 5 mi (8 km) upstream which can divert as much as 23 ft'is (0.65 m 3/s) into 
Cidra Reservoir. 
AVERAGE DISCHARGE.--26 years (1961-86), 113 fti/s (3.200 mYs), 28.00 in/yr (111 mm/yr), 81,870 acre-ft/yr 
(101 hiP/yr); median of yearly mean discharges, 91 ft'is (2.58 m'/s), 65,900 acre-ft/yr (81 hm'/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 59,600 ft'is (1,690 m'/s), Aug. 27, 1961, gage height, 
32.21 ft (9.818 m), from rating curve extended above 7,000 ft'is (198 0/s) on basis of slope-area measurement; 
minimum daily discharge, 2.6 ft'is (0.074 m'/s), July 25, 1974. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,000 ft'is (113 m'/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time (W/s) (80/s) (ft) (m) 
Date 
Time (W/s) (m'/s) (ft) (m) 
Oct. 6 
1330 
*28,900 
818 
*22.00 6.706 
May 13 
2400 
4,600 
130 
10.50 3.200 
Minimum daily discharge, 6.2 ft'A (0.176 m 3/s), Aug. 27. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
28 
248 
98 
44 
27 
15 
14 
186 
47 
22 
18 
159 
2 
43 
146 
92 
49 
31 
14 
12 
92 
59 
26 
15 
56 
3 
30 
498 
86 
50 
37 
13 
44 
50 
56 
21 
13 
33 
4 
33 
291 
82 
58 
51 
14 
73 
44 
47 
26 
12 
28 
5 
84 
272 
86 
54 
75 
16 
47 
41 
45 
25 
14 
26 
6 
5000 
246 
91 
46 
37 
17 
36 
40 
42 
26 
13 
27 
7 
3000 
191 
84 
42 
29 
16 
18 
146 
41 
34 
11 
25 
8 
1000 
156 
75 
39 
28 
13 
219 
146 
48 
23 
15 
22 
9 
350 
134 
79 
53 
31 
13 
111 
147 
74 
20 
17 
18 
10 
250 
120 
77 
86 
29 
13 
24 
599 
75 
19 
13 
18 
11 
180 
109 
76 
51 
24 
13 
22 
553 
49 
22 
15 
17 
12 
150 
149 
84 
43 
24 
17 
21 
199 
41 
53 
24 
16 
13 
120 
380 
91 
39 
24 
16 
24 
766 
38 
34 
22 
15 
14 
110 
401 
73 
37 
23 
19 
50 
611 
47 
31 
44 
17 
15 
100 
1110 
70 
35 
22 
23 
44 
175 
37 
34 
15 
17 
16 
90 
595 
68 
34 
22 
25 
90 
82 
52 
29 
13 
11 
17 
83 
389 
62 
34 
22 
18 
57 
52 
35 
22 
12 
11 
18 
134 
870 
60 
40 
23 
15 
49 
387 
27 
19 
11 
9.5 
19 
157 
339 
61 
34 
24 
16 
46 
178 
23 
21 
9.0 
8.5 
20 
92 
319 
63 
32 
27 
14 
81 
79 
24 
26 
8.2 
7.8 
21 
77 
697 
59 
32 
23 
14 
58 
54 
22 
26 
7.8 
12 
22 
76 
263 
57 
33 
20 
14 
33 
45 
23 
25 
7.2 
16 
23 
482 
207 
55 
25 
20 
14 
29 
36 
23 
21 
17 
13 
24 
604 
167 
59 
51 
20 
14 
26 
30 
23 
18 
11 
16 
25 
506 
146 
63 
48 
20 
15 
25 
27 
23 
18 
12 
21 
26 
374 
131 
65 
31 
22 
14 
25 
24 
23 
18 
6.8 
24 
27 
544 
122 
55 
29 
19 
14 
26 
24 
22 
18 
6.2 
18 
28 
215 
114 
52 
21 
16 
13 
27 
29 
25 
19 
11 
20 
29 
752 
106 
50 
23 
---
33 
417 
32 
26 
20 
631 
23 
30 
676 
102 
48 
25 
45 
553 
27 
26 
17 
138 
25 
31 
729 
---
45 
21 
21 
---
71 
---
18 
66 
---
TOTAL 
16069 
9018 
2166 
1239 
770 
531 
2301 
4972 
1143 
751 
1228.2 
729.8 
MEAN 
518 
301 
69.9 
40.0 
27.5 
17.1 
76.7 
160 
38.1 
24.2 
39.6 
24.3 
MAX 
5000 
1110 
98 
86 
75 
45 
553 
766 
75 
53 
631 
159 
MIN 
28 
102 
45 
21 
16 
13 
12 
24 
22 
17 
6.2 
7.8 
CFSM 
9.45 
5.49 
1.28 
.73 
.50 
.31 
1.40 
2.92 
.70 
.44 
.72 
.44 
IN. 
10.91 
6.12 
1.47 
.84 
.52 
.36 
1.56 
3.38 
.78 
.51 
.83 
.50 
AC-FT 
31870 
17890 
4300 
2460 
1530 
1050 
4560 
9860 
2270 
1490 
2440 
1450 
CAL YR 1985 TOTAL 
57179.9 
MEAN 
157 
MAX 
5000 
MIN 
8.0 
CFSM 2.86 
IN. 
38.82 
AC-FT 113400 
WTR YR 1986 TOTAL 
40918.0 
MEAN 
112 
MAX 
5000 
MIN 
6.2 
CFSM 2.04 
IN. 
27.78 
AC-FT 
81160 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO DE LA PLATA BASIN 
51)043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR--Continued 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1958 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL. 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) (US/CM) UNITS) (DEG C) (NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
18... 
1030 
122 
327 
8.20 
25.5 
1.0 
11 
2000 
K170 
DEC 
09... 
1100 
30 
402 
8.20 
23.5 
1.4 
<10 
290 
160 
FEB 1986 
14... 
1110 
?4 
480 
8.45 
24.0 
1.8 
9.9 
122 
20 
K630 
410 
APR 
10... 
1415 
23 
417 
7.90 
30.5 
6.0 
12.2 
167 
23 
450 
480 
JUL 
15... 
1325 
32 
362 
8.70 
29.5 
3.0 
10.0 
134 
<10 
K70 
K99 
SEP 
24... 
1435 
27 
356 
8.17 
30.5 
15 
7.2 
99 
<10 
41 
320 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD- 
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE 01S- DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
18... 
120 
7 
31 
11 
21 
0.9 
1.5 
116 
<0.5 
15 
22 
DEC 
09... 
148 
FEB 1986 
14... 
162 
APR 
10... 
140 
13 
37 
12 
25 
0.9 
2.6 
129 
<0.5 
17 
27 
JUL 
15... 
133 
SEP 
24... 
120 
4 
29 
11 
21 
0.9 
2.7 
114 
18 
20 
SOLIDS, 
SOLIDS, 
FLUID- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
D1S- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/1) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
18... 
0.10 
23 
190 
64 
2 
0.730 
0.070 
0.800 
0.040 
0.36 
DEC 
09... 
5 
1.02 
0.080 
1.10 
0.050 
0.45 
FEB 1986 
14... 
1 
2.06 
0.040 
2.10 
0.040 
0.66 
APR 
10... 
0.20 
23 
220 
14 
16 
1.74 
0.060 
1.80 
0.060 
0.64 
JUL 
15... 
7 
0.880 
0.020 
0.900 
0.020 
0.88 
SEP 
24... 
0.10 
20 
190 
14 
9 
1.24 
0.060 
1.30 
0.030 
0.57 
K = non-ideal count 
127 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
RIO DE LA PLATA BASIN 
50043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA NITRO- NITRO- PHOS- 
TOTAL TOTAL TOTAL TOTAL TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
18... 
0.40 
1.2 
5.3 
0.150 
1 
<100 
40 
1 
4 
<10 
DEC 
09... 
0.50 
1.6 
7.1 
0.220 
FEB 1986 
14... 
0.70 
2.8 
12 
0.500 
APR 
10... 
0.70 
2.5 
11 
0.370 
1 
<100 
40 
<1 
6 
10 
JUL 
15... 
0.90 
1.8 
8.0 
0.360 
SEP 
24... 
0.60 
1.9 
8.4 
0.290 
MANGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
18... 
180 
<1 
10 
<0.10 
<1 
<1 
20 
<0.010 
<1 
0.07 
DEC 
09... 
FEB 1986 
14... 
APR 
10... 
400 
2 
40 
0.20 
<1 
<1 
30 
<0.010 
<1 
0.08 
JUL 
15... 
SEP 
24... 
128 
 
 
         
 
    
 
    
 
       
  
       
  
           
           
           
           
 
 
 
 
 
  
 
   
      
           
     
    
           
 
 
           
 
         
 
 
 
 
     
         
 
 
          
         
          
 
     
 
     
          
 
     
          
129 
RIO DE LA PLATA BASIN 
50044000 RIO DE LA PLATA NEAR COMERIO, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°14'33", long 66°12'28", at bridge on Highway 156, 0.56 mi (0.9 km) upstream from dam, about 
2.0 mi (3.2 km) northeast of Comerio plaza. 
DRAINAGE AREA.--139 sq mi (360 sq km). 
PERIOD OF RECORD.--Water years 1979 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
18... 
1410 
197 
362 
8.20 
25.5 
3.6 
<10 
25000 
25000 
DEC 
20... 
0850 
143 
397 
8.30 
23.5 
1.5 
14 
K620 
360 
FEB 1986 
20... 
1035 
68 
449 
8.45 
21.5 
1.3 
9.3 
108 
29 
1000 
730 
APR 
25... 
1020 
41 
432 
7.93 
26.5 
3.2 
8.0 
101 
23 
280 
K100 
JUL 
16... 
0900 
86 
362 
8.00 
26.5 
1.8 
8.5 
107 
<10 
K1300 
K800 
SEP 
05... 
0855 
58 
365 
7.61 
27.0 
4.6 
7.6 
98 
<10 
500 
250 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NOWCARB CALCIUM 
SLUM, SODIUM, 
AD-
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
18... 
140 
9 
33 
13 
20 
0.8 
2.3 
127 
<0.5 
18 
22 
DEC 
20... 
152 
FEB 1986 
20... 
150 
APR 
25... 
150 
12 
35 
15 
25 
0.9 
2.7 
137 
<0.5 
16 
27 
JUL 
16... 
132 
SEP 
05... 
130 
11 
31 
13 
21 
0.8 
2.9 
120 
18 
19 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
D1S-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
D1S-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 
AMMONIA ORGANIC 
SOLVED (MG/L 01S- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
5102) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
18... 
0.10 
23 
210 
110 
11 
0.690 
0.010 
0.700 
0.040 
0.46 
DEC 
20... 
5 
0.980 
0.020 
1.00 
0.050 
0.35 
FEB 1986 
20... 
4 
0.970 
0.030 
1.00 
0.070 
0.33 
APR 
25... 
0.20 
28 
230 
26 
4 
0.850 
0.050 
0.900 
0.090 
0.51 
JUL 
16... 
9 
0.580 
0.020 
0.600 
0.030 
0.37 
SEP 
05... 
0.10 
27 
200 
32 
6 
0.760 
0.040 
0.800 
0.050 
3.0 
K = non-ideal count 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
RIO DE LA PLATA BASIN 
50044000 RIO DE LA PLATA NEAR COMERIO, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MUM, COPPER, 
MONIA NITRO- NITRO- PHOS- 
TOTAL TOTAL TOTAL TOTAL TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS 8) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
18... 
0.50 
1.2 
5.3 
0.120 
1 
<100 
60 
1 
6 
10 
DEC 
20... 
0.40 
1.4 
6.2 
0.190 
FEB 1986 
20... 
0.40 
1.4 
6.2 
0.280 
APR 
25... 
0.60 
1.5 
6.6 
0.310 
1 
100 
60 
<1 
9 
10 
JUL 
16... 
0.40 
1.0 
4.4 
0.200 
SEP 
05... 
3.0 
3.8 
17 
0.210 
MANGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (LG/L) 
(MG/L) 
OCT 1985 
18... 
400 
1 
20 
<0.10 
<1 
<1 
40 
<0.010 
<1 
0.07 
DEC 
20... 
FEB 1986 
20... 
APR 
25... 
390 
<1 
30 
0.10 
<1 
<1 
30 
<0.010 
<1 
0.05 
JUL 
16... 
SEP 
05... 
130 
I
I
 
 
         
 
    
 
     
       
  
       
  
           
           
           
          
 
 
 
 
 
 
 
  
 
         
           
         
           
 
 
           
 
          
 
 
 
 
 
     
 
         
 
 
 
          
 
         
      
   
 
     
 
     
      
   
 
     
         
131 
RIO DE LA PLATA BASIN 
50044850 RIO GUADIANA NEAR NARANJITO, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°18'39", long 66°13'28", at steel-cross-bridge 0.8 i (1.3 km) northwest of Highway 164, 1.2 mi 
(1.9 km) upstream from mouth and about 2.0 mi (3.2 km) northeast of Naranjito plaza. 
DRAINAGE AREA.--4.0 sq i (10.3 sq km). 
PERIOD OF RECORD.--Water year 1979 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
25... 
1525 
17 
301 
8.00 
26.5 
13 
42 
2100 
2400 
DEC 
20... 
1045 
' 12 
304 
8.30 
23.5 
3.0 
<10 
3100 
600 
FEB 1986 
20... 
1315 
6.2 
302 
8.65 
24.5 
1.3 
10.2 
124 
24 
K1000 
930 
APR 
25... 
1335 
6.4 
355 
8.25 
30.5 
1.5 
8.5 
113 
<10 
570 
K130 
JUL 
16... 
1220 
11 
301 
7.60 
27.5 
20 
7.8 
98 
45 
9300 
2700 
SEP 
05... 
1200 
7.9 
355 
7.80 
29.5 
4.4 
7.7 
102 
<10 
K100 
HARD-
ALKA-
NESS 
KAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD-
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
25... 
120 
20 
37 
6.9 
25 
1 
4.5 
101 
<0.5 
19 
42 
DEC 
20... 
110 
FEB 1986 
20... 
105 
APR 
25... 
130 
21 
30 
14 
17 
0.7 
2.5 
112 
<0.5 
15 
24 
JUL 
16... 
90 
SEP 
05... 
140 
28 
31 
14 
17 
0.7 
2.6 
107 
19 
21 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
25... 
<0.10 
14 
210 
9.6 
16 
0.010 
<0.100 
0.230 
1.1 
DEC 
20... 
6 
1.13 
0.070 
1.20 
0.150 
0.45 
FEB 1986 
20... 
3 
1.19 
0.010 
1.20 
0.040 
0.56 
APR 
25... 
0.10 
26 
200 
3.4 
1 
<0.010 
1.40 
0.030 
0.47 
JUL 
16... 
39 
1.99 
0.010 
2.00 
0.050 
0.75 
SEP 
05... 
0.10 
27 
200 
4.2 
2 
1.29 
0.010 
1.30 
<0.010 
K = non-ideal count 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
RIO DE LA PLATA BASIN 
50044850 RIO GUADIANA NEAR NARANJITO, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
25... 
1.3 
-- 
0.120 
2 
<100 
60 
1 
1 
<10 
DEC 
20... 
0.60 
1.8 
8.0 
0.190 
-- 
FEB 1986 
20... 
0.60 
1.8 
8.0 
0.310 
APR 
25... 
0.50 
1.9 
8.4 
0.300 
1 
100 
<10 
<10 
JUL 
16... 
0.80 
2.8 
12 
0.210 
SEP 
05... 
0.60 
1.9 
8.4 
0.250 
-- 
MANGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, 
RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
25... 
3400 
1 
230 
<0.10 
<1 
<1 
40 
<0.010 
5 
0.08 
DEC 
20... 
FEB 1986 
20... 
APR 
25... 
270 
1 
30 
<0.10 
<1 
<10 
<0.010 
<1 
0.04 
JUL 
16... 
SEP 
05... 
132 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
  
 
 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO DE LA PLATA BASIN 
50046000 RIO DE LA PLATA AT TOA ALTA, PR 
(National stream-quality accounting network station) 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°24'41", long 66°15'39", at Highway 2, 1.3 mi (2.1 km) downstream from Rio Lajas, and 1.6 mi 
(2.6 km) northwest of Toa Alta, 11.3 mi (18.2 km) downstream from Puerto Rico Aqueduct and Sewer Authority 
reservoir. 
DRAINAGE AREA.--208 sq ni (539 sq km), exclude 8.2 sq mi (21.2 sq km) upstream from Lago Carite, flow from 
which is diverted to Rio Guamani. 
PERIOD OF RECORD.--Water years 1958 to current year 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, 
COLI- 
STREP- 
SPE- 
DIS- FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED FECAL, FECAL, HARD- 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
0.7 
KF AGAR 
NESS 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT UM-MF (COLS. (MG/L 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- (COLS./ PER 
AS 
(CFS) (US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) 100 ML) 100 ML) 
CAC03) 
OCT 1985 
16... 
1630 
231 
296 
7.60 
28.0 
0.60 
K680 
200 
120 
DEC 
05... 
1140 
224 
319 
7.80 
25.5 
17 
2800 
86 
130 
FEB 1986 
05... 
1020 
233 
400 
7.80 
25.0 
17 
4.7 
57 
4300 
6500 
160 
APR 
08... 
1140 
102 
446 
8.01 
27.5 
6.2 
6.7 
84 
K2500 
K160 
160 
JUN 
4... 
1035 
157 
335 
7.25 
28.5 
6.0 
5.4 
69 
2600 
K150 
130 
AUG 
26... 
1120 
15 
491 
7.85 
30.0 
3.1 
9.4 
125 
350 
82 
210 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- FLUO- SILICA, 
NONCARB CALCIUM SIUM, SODIUM, 
AD- 
SIUM, WATER SULFATE RIDE, 
RIDE, 
DIS- 
WATER 
DIS- 
DIS- 
DIS- 
SORP- 
DIS- 
TOTAL 
DIS- 
DIS- 
DIS- 
SOLVED 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
SOLVED 
SOLVED 
SOLVED 
(MG/L 
DATE 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
AS 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS SO4) 
AS CL) 
AS F) 
SI02) 
OCT 1985 
16... 
32 
34 
8.3 
13 
0.5 
2.1 
87 
17 
18 
0.10 
20 
DEC 
5... 
9 
34 
10 
16 
0.6 
2.1 
117 
15 
22 
0.10 
21 
FEB 1986 
05... 
9 
43 
13 
23 
0.8 
2.8 
152 
15 
29 
<0.10 
19 
APR 
08... 
6 
40 
14 
22 
0.8 
2.5 
152 
18 
29 
0.20 
22 
JUN 
4... 
7 
37 
9.8 
16 
0.6 
2.6 
126 
17 
19 
0.10 
18 
AUG 
26... 
17 
61 
13 
25 
0.8 
3.3 
189 
18 
35 
0.30 
20 
SOLIDS, SOLIDS, 
NITRO- NITRO- NITRO- NITRO- 
PHOS- PHOS- 
RESIDUE SUM OF 
SOLIDS, 
GEN, 
. GEN, 
GEN, 
GEN,AM- 
PHOS- 
PHORUS, 
PHATE, 
AT 180 
CONSTI- 
DIS- 
NO2+NO3 AMMONIA AMMONIA MONIA + 
PHOS- 
PHORUS, 
ORTHO, 
ORTHO, 
DEG. C TUENTS, 
SOLVED 
DIS- 
DIS- 
DIS- 
ORGANIC PHORUS, 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- (TONS SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED SOLVED SOLVED 
DATE SOLVED SOLVED PER (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L 
(MG/L) 
(MG/L) 
DAY) 
AS N) 
AS N) 
AS NH4) 
AS N) 
AS P) 
AS P) 
AS P) 
AS PO4) 
OCT.  1985 
16... 
176 170 110 
0.920 0.090 0.12 0.60 0.120 0.050 0.020 0.06 
DEC 
5... 
174 190 105 
0.740 0.110 0.14 0.60 0.120 0.090 0.080 0.25 
FEB 1986 
05... 
231 240 145 
0.510 0.360 0.46 0.80 0.210 0.140 0.130 0.40 
APR 
08... 
241 
240 
66 
0.200 
0.180 
0.23 
0.70 
0.130 
0.090 
0.060 
0.18 
JUN 
04... 
198 
200 
84 
0.540 
0.110 
0.14 
0.50 
0.080 
0.050 
0.040 
0.12 
AUG 
26... 
297 
290 
12 
0.590 
0.180 
0.23 
1.1 
0.570 
0.370 
0.010 
0.03 
K 
non-ideal count 
133 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
RIO DE LA PLATA BASIN 
50046000 RIO DE LA PLATA AT TOA ALTA, PR--Continued 
(National stream-quality accounting network station) 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
ALUM- 
BERYL- 
CHRO- 
INUM, ARSENIC BARIUM, LIUM, CADMIUM MIUM, COBALT, COPPER, IRON, LEAD, 
DIS- 
DIS- 
DIS- 
DIS- 
D1S- 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- 
SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS AL) 
AS AS) 
AS BA) 
AS BE) 
AS CD) 
AS CR) 
AS CO) 
AS CU) 
AS FE) 
AS PB) 
OCT 1985 
16... 
70 
<1 
42 
<0.5 
<1 
<1 
<3 
4 
55 
2 
DEC 
05... 
FEB 1986 
05... 
20 
1 
50 
<0.5 
2 
<1 
<3 
2 
9 
<1 
APR 
08... 
JUN 
04... 
80 
1 
41 
<0.5 
1 
<1 
<3 
4 
10 
1 
AUG 
26... 
30 
2 
56 
<0.5 
<1 
2 
<3 
4 
6 
<5 
MANGA- 
MOLYB- 
SELE- 
STRON- VANA- 
LITHIUM NESE, MERCURY DENUM, NICKEL, NIUM, SILVER, TIUM, DIUM, ZINC, 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- 
DIS- 
SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOcVED SOLVED 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS LI) 
AS MN) 
AS HG) 
AS MO) 
AS NI) 
AS SE) 
AS AG) 
AS SR) 
AS V) 
AS ZN) 
OCT 1985 
16... 
<4 
53 
<0.1 
<10 
6 
<1 
<1 
130 
6 
15 
DEC 
05... 
FEB 1986 
05... 
5 
240 
0.1 
<10 
<1 
<1 
<1 
220 
8 
5 
APR 
08... 
JUN 
04... 
4 
46 
0.2 
<10 
<1 
<1 
<1 
160 
7 
8 
AUG 
26... 
<4 
140 
<0.1 
<10 
1 
<1 
<1 
340 
7 
5 
PESTICIDE ANALYSES 
CHLOR- 
DI- 
DI- 
PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN 
DATE 
TIME 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUN 1986 
04... 
1035 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.09 <0.010 
HEPTA- 
METH- 
ENDO- 
HEPTA- CHLOR 
MALA- OXY- 
SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, 
DATE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
JUN 1986 
04... 
<0.010 
<0.010 
<0.01 
<0.010 
<0.010 
<0.010 
<0.01 
<0.01 
NAPH- 
THA- 
METHYL METHYL 
LENES, 
PARA- 
TRI- 
PARA- 
POLY- 
PER- 
TOX- 
TOTAL 
THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI-
DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (JG/L) (UG/L) 
JUN 1986 
04... 
<0.01 
<0.01 
<0.01 
<0.01 
<0.10 
<0.1 
<1 
<0.01 
134 
 
 
   
 
     
     
     
     
     
135 
RIO DE LA PLATA BASIN 
50046000 RIO DE LA PLATA AT TOA ALTA, PR--Continued 
(National stream-quality accounting network station) 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT 
SEDI-
SED. 
MENT, 
SUSP. 
STREAM- SEDI- DIS- SIEVE 
FLOW, MENT, CHARGE, DIAM. 
INSTAN-
SUS-
SUS-
e FINER 
DATE TIME TANEOUS PENOED PENDED THAN 
(CFS) 
(MG/L) (T/DAY) .062 MM 
OCT 1985 
16... 
1630 
250 
293 
198 
94 
DEC 
05... 
1230 
251 
52 
35 
95 
APR 1986 
08... 
1200 
121 
64 
21 
86 
JUN 
04... 
1035 
152 
52 
21 
97 
AUG 
26... 
1120 
14 
22 
0.83 
41 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
   
   
136 
RIO DE LA PLATA BASIN 
50046900 RIO DE LA PLATA AT HIGHWAY 2 NEAR TOA ALTA, PR 
LOCATION.--Lat 18°24'41", long 66°15'39", Hydrologic Unit 21010005, on left bank, at downstream side of bridge on Highway 2, 
1.3 mi ( 2.1 km) downstream from Rio Lajas, and 1.6 mi (2.6 km) northwest of Toa Alta, 11.3 mi (18.2 km) downstream from 
Puerto Rico Aqueduct and Sewer Authority reservoir. Prior to September 25, 1984, at site about 1.0 mi (1.6 km) upstream. 
DRAINAGE AREA.--208 mi' (539 km,), excludes 8.2 mi' (21.2 km') upstream from Lago Carite, flow from which is diverted to Rio 
Guamani. Area at site used prior to September 25, 1984, 200 mi' (518 km 2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--November 1959 (measurement only), January 1960 to current year. Prior to September 1984, published as 
Rio de la Plata at Toa Alta, P.R. 
GAGE.--Water-stage recorder. Elevation of gage is 0.0 ft (0.0 m), from topographic map. 
REMARKS.--Estimated daily discharges: May 1, 9-13. Records fair except those for estimated daily discharges, which are poor. 
Regulation at all stages by Puerto Rico Aqueduct and Sewer Authority reservoir upstream from gage. 
AVERAGE DISCHARGE.--26 years (1961-86), 281 ft'/s (7.958 mi/s), 19.08 in/yr (485 mm/yr), 203,600 acre-ft/yr (251 hie/yr); 
median of yearly mean discharges, 230 ft'is (6.51 10/s), 167,000 acre-ft/yr (210 hoe/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 95,500 ftys (2,700 mi/s), Sept. 6, 1960, gage height, 36.35 ft (11.079 m), 
from floodmark, from rating curve extended above 12,000 ft'is (340 e/s) on basis of contracted-opening measurement of peak 
flow at site 1.0 mi upstream and different datum; minimum discharge, 2.2 ft'/s (0.062 10/s), Apr. 25, 1984. 
EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate discharges and elevations of major floods, as pointed out by local residents 
are as follows: Sept. 13, 1928, 120,000 ft'/s (3,400 m'/s), gage height, 37.4 ft (11.40 m); June 16, 1943, 82,000 ft'/s 
(2,320 e/s), gage height, 34.4 ft (10.48 m), at site 1.0 mi upstream and different datum. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 6,000 ft'is (170 10/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft'/s) 
(e/s) 
(ft) 
(m) 
Date 
Time 
(f't/s) 
(e/s) 
(ft) 
(m) 
Oct. 7 
0300 
*74,400 
2,110 
*24.58 7.492 
May 1 
2245 
6,280 
178 
12.85 3.917 
Oct. 8 
0930 
9,280 
263 
14.94 4.554 
May 13 
1200 
30,700 
869 
20.64 6.291 
Oct. 26 
1730 
7,380 
209 
13.72 4.182 
May 14 
0615 
23,900 
666 
19.53 5.953 
Nov. 15 
1915 
7,720 
219 
13.98 4.261 
Minimum discharge, 2.6 ft'is (0.074 80/s), Apr. 1, 28. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
DAY 
OCT 
NOV 
DEC 
JAN 
MEAN 
FEB 
VALUES 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
2 
3 
4 
5 
119 
98 
83 
78 
640 
989 
617 
677 
1310 
553 
268 
259 
242 
244 
232 
104 
115 
110 
125 
113 
27 
27 
39 
71 
189 
5.9 
6.2 
6.5 
6.3 
5.4 
11 
9.7 
10 
20 
1100 
3100 
1290 
342 
197 
179 
412 
259 
194 
158 
142 
24 
21 
19 
18 
17 
33 
15 
15-
18 
23 
192 
509 
187 
89 
59 
6 
7 
8 
9 
10 
9880 
36100 
6210 
1920 
854 
395 
347 
304 
271 
256 
264 
230 
203 
207 
211 
102 
97 
96 
170 
192 
114 
82 
74 
66 
59 
5.7 
6.8 
6.3 
6.3 
8.5 
778 
191 
259 
1180 
309 
110 
337 
392 
980 
1000 
116 
103 
107 
108 
147 
28 
33 
17 
17 
17 
15 
17 
19 
24 
21 
55 
51 
45 
43 
38 
11 
12 
13 
14 
15 
544 
418 
342 
296 
264 
282 
485 
968 
1140 
5580 
194 
192 
188 
188 
161 
120 
103 
98 
88 
74 
43 
28 
21 
13 
10 
8.4 
6.9 
7.4 
11 
7.9 
120 
82 
71 
57 
48 
2900 
800 
12000 
10100 
1450 
164 
178 
181 
129 
221 
111 
61 
21 
18 
147 
21 
41 
126 
94 
35 
34 
26 
21 
17 
15 
16 
17 
18 
19 
20 
231 
212 
538 
318 
392 
3260 
1220 
1500 
935 
677 
156 
161 
142 
136 
134 
68 
76 
84 
80 
68 
11 
11 
9.4 
7.1 
7.3 
8.2 
7.7 
10 
9.2 
9.5 
36 
20 
15 
10 
15 
705 
479 
526 
939 
482 
268 
145 
106 
86 
78 
174 
347 
79 
47 
33 
25 
20 
17 
16 
20 
13 
13 
12 
12 
11 
21 
22 
23 
24 
25 
236 
184 
244 
2470 
1340 
1600 
858 
567 
468 
396 
129 
128 
128 
126 
109 
59 
55 
56 
57 
60 
10 
9.6 
13 
10 
8.1 
9.3 
8.4 
7.8 
9.9 
13 
87 
74 
55 
42 
20 
339 
273 
223 
189 
169 
68 
61 
54 
47 
40 
26 
21 
18 
20 
21 
26 
24 
21 
24 
19 
15 
18 
22 
17 
26 
26 
27 
28 
29 
30 
31 
2220 
2250 
1260 
1590 
1760 
2140 
354 
325 
304 
295 
281 
---
113 
114 
110 
107 
101 
98 
68 
72 
64 
51 
40 
29 
6.6 
5.8 
5.9 
---
13 
13 
9.2 
8.0 
6.8 
9.2 
11 
5.6 
3.0 
391 
3210 
---
155 
142 
451 
416 
323 
347 
34 
34 
36 
32 
27 
---
17 
17 
21 
22 
20 
44 
16 
16 
'43 
2010 
704 
257 
23 
17 
20 
22 
17 
---
TOTAL 
MEAN 
MAX 
MIN 
CFSM 
IN. 
AC-FT 
75231 
2427 
36100 
78 
12.1 
13.99 
149200 
27214 
907 
5580 
256 
4.53 
5.06 
53980 
5275 
170 
268 
98 
.85 
.98 
10460 
2694 
86.9 
192 
29 
.43 
.50 
5340 
977.8 
34.9 
189 
5.8 
.17 
.18 
1940 
257.7 
8.31 
13 
5.4 
.04 
.05 
511 
8240.3 
275 
3210 
3.0 
1.37 
1.53 
16340 
41335 
1333 
12000 
110 
6.66 
7.69 
81990 
3735 
125 
412 
27 
.62 
.69 
7410 
1296 
41.8 
174 
17 
.21 
.24 
2570 
3775 
122 
2010 
15 
.61 
.70 
7490 
1639 
54.6 
509 
11 
.27 
.30 
3250 
CAL YR 1985 
WTR YR 1986 
TOTAL 
TOTAL 
193:96 
171669.8 
MEAN 
MEAN 
531 
470 
MAX 
MAX 
36100 
36100 
MIN 
MIN 
10 
3.0 
CFSM 
CFSM 
2.65 
2.35 
IN. 
IN. 
36.05 
31.93 
AC-FT 
AC-FT 
384400 
340500 
 
137 
AN JUAN 
Droinage boundaries indeterminate 
in limestone terrone 
147530 
CATA 0 
BAYA MO 
219 
04851V 
resa de 
Piedre,s 
Los Cur 
TRUJILL© ALTO 
Drainage boundary 
AGUAS BUENAS 
N 
Rio Grande de 
CIDRA 
EXPLANATION 
0476 QUALITY—OF WATER STATION 
AND NUMBER 
• 220 
WELL AND WELL NUMBER 
AGVADILLA BARE 
KILOMETERS 
AYAGUEZ 
Figure 17.--Rio Hondo to the Rio Puerto Nuevo basins. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
    
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO HONDO BASIN 
50047530 RIO HONDO AT FLOOD CHANNEL NEAR CATANO, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°26'13", long 66°09'36", at Rio Hondo Channel, 800 ft (245 m) below junction with Rio Hondo, 
0.9 mi (1.5 km) downstream from bridge on de Diego Expressway and 1.1 mi (1.8 km) above mouth. 
DRAINAGE AREA.--Indeterminate. 
PERIOD OF RECORD.--Water years 1979 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLT- STREP- 
HARD- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
NESS 
CIFIC 
SOLVED CHEM- FECAL, FECAL, HARD- NONCARB 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
NESS 
WATER 
DUCT- 
(STAND- 
ATURE 
BID- 
DIS- 
CENT 
(HIGH 
UM-MF 
(COLS. 
(MG/L 
TOT FLD 
DATE 
TIME 
ANCE 
ARD 
WATER 
1TY 
SOLVED 
SATUR- LEVEL) 
(COLS./ 
PER 
AS 
MG/L AS 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
CAC03) 
CAC03 
NOV 1985 
12... 1000 
11000 
7.40 
27.0 11 
290 >600000 33000 
1300 
1100 
DEC 
27... 
1400 
18000 
7.60 
28.5 11 
320 2400000 58000 
FEB 1986 
27... 
1430 
43400 
7.60 
31.0 
7.2 
0.2 
3 
1900 
65000 
<1000 
MAY 
16... 
1015 
13000 
7.25 
27.0 
5.5 
0.1 
1 
250 K9100000 
77000 
1000 
860 
JUL 
28... 
1240 
14000 
7.65 
33.5 
3.2 
6.7 
98 
350 K120000 K17000 
SEP 
24... 
1050 
7200 
7.45 
30.0 
10 
0.3 
4 
130 K7600000 K160000 
730 
590 
ALKA- 
SOLIDS, 
MAGNE- 
SODIUM 
POTAS- LINITY 
CHLO- 
FLUO- 
SILICA, SUM OF 
CALCIUM SLUM, SODIUM, 
AD- 
SLUM, WATER 
SULFATE RIDE, RIDE, DIS- CONSTI- 
DIS- 
DIS- DIS- 
SORP- 
DIS- TOTAL SULFIDE DIS- 
DIS- 
DIS- SOLVED TUENTS, 
SOLVED SOLVED SOLVED 
TION SOLVED FIELD TCTAL SOLVED SOLVED SOLVED (MG/L 
DIS- 
DATE 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS 
SOLVED 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
AS F) 
SI02) 
(MG/L) 
NOV 1985 
12... 
100 
250 
2000 
25 
73 
133 
<0.5 
490 
3700 
0.40 
7.6 
6700 
DEC 
27... 
189 
6200 
-- 
FEB 1986 
27... 
- 
165 
-- 19000 
MAY 
16... 
110 
180 
1400 
19 
53 
155 
<0.5 
480 
2700 
0.30 
13 
5000 
JUL 
28... 
187 
480C 
SEP 
24... 
60 
140 
1200 
20 
54 
132 
380 
2500 
0.30 
11 
4400 
SOLIDS, 
NITRO- 
SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- GEN,AM- 
BARIUM, BORON, CADMIUM 
D1S- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
MONIA + 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
SOLVED DEG. C, NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC PHORUS, ARSENIC 
RECOV- 
RECOV- 
RECOV- 
(TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE 
DATE 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
NOV 1985 
12... 
0.0 
30 
0.010 
<0.100 
4.20 
2.6 
6.8 
1.20 
2 
100 
910 
1 
DEC 
27... 
30 
0.010 
<0.100 
9.90 
4.1 
14 
<0.010 
FEB 1986 
27... 
45 
0.020 
<0.100 
4.70 
1.60 
-- 
MAY 
16... 
0.0 
9 
0.050 
<0.100 
4.20 
2.7 
6.9 
1.30 
2 
100 
630 
1 
JUL 
28... 
11 
0.010 
<0.100 
7.10 
3.9 
11 
2.10 
SEP 
24... 
0.0 
15 
0.010 
<0.100 
4.40 
2.6 
7.0 
1.70 
K = non-ideal count 
138 
 
  
 
          
            
          
 
 
139 
RIO HONDO BASIN 
50047530 RIO HONDO AT FLOOD CHANNEL NEAR CATANO, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
CHRO-
MANGA-
METHY-
MIUM, COPPER, IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS CR) 
AS CU) 
AS FE) 
AS PO 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
NOV 1985 
12... 
29 
50 
560 
3 
450 
0.30 
<1 
1 
50 
<0.010 
4 
1.4 
DEC 
27... 
FEB 1986 
27... 
MAY 
16... 
37 
30 
670 
7 
460 
0.30 
<1 
1 
120 
0.020 
23 
1.7 
JUL 
28... 
SEP 
24... 
 
 
         
 
    
 
     
 
 
 
 
  
 
         
           
         
           
 
 
           
 
         
 
 
 
 
     
         
 
 
          
         
          
 
 
   
 
   
      
   
     
          
140 
RIO DE BAYAMON BASIN 
50047600 RIO DE BAYAMON NEAR AGUAS BUENAS, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°14'39", long 66°08'39", at bridge on Highway 156, and 2.9 mi (4.7 km) west of Aguas Buenas plaza. 
DRAINAGE AREA.--18.5 sq mi (47.9 sq km). 
PERIOD OF RECORD.--Water years 1958-65, 1974 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
24... 
0950 
137 
151 
7.60 
23.5 
52 
19 
4300 
6700 
DEC 
09... 
1445 
30 
243 
8.00 
23.5 
14 
<10 
K7400 
6000 
FEB 1986 
14... 
1440 
30 
219 
8.40 
21.5 
5.0 
9.0 
106 
23 
430 
K1400 
MAY 
05... 
1500 
14 
336 
8.04 
27.0 
3.2 
7.7 
99 
25 
450 
3500 
JUL 
15... 
0910 
31 
219 
7.76 
24.0 
220 
7.7 
93 
14 
50000 
23000 
SEP 
04... 
0940 
31 
263 
7.70 
24.5 
34 
7.8 
97 
36 
K800 
1500 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD-
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
24... 
53 
4 
12 
5.6 
9.4 
0.6 
2.7 
49 
<0.5 
11 
12 
DEC 
09... 
88 
FEB 1986 
14... 
72 
MAY 
05... 
120 
6 
28 
11 
13 
0.5 
2.1 
109 
<0.5 
13 
15 
JUL 
15... 
77 
SEP 
04... 
89 
2 
21 
8.9 
14 
0.7 
2.7 
87 
8.5 
14 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
24... 
<0.10 
16 
98 
36 
51 
0.360 
0.040 
0.400 
0.080 
0.52 
DEC 
09... 
7 
<0.010 
0.800 
0.030 
0.67 
FEB 1986 
14... 
3 
<0.010 
0.500 
0.020 
0.28 
MAY 
05... 
<0.10 
27 
170 
6.5 
3 
<0.010 
0.700 
0.010 
0.39 
JUL 
15... 
187 
0.760 
0.040 
0.800 
0.090 
0.41 
SEP 
04... 
<0.10 
23 
140 
12 
18 
0.670 
0.030 
0.700 
0.040 
0.36 
K = non-ideal count 
 
 
    
    
 
          
         
          
    
   
          
   
    
  
 
        
          
       
 
  
   
 
   
  
 
141 
RIO DE BAYAMON BASIN 
50047600 RIO DE BAYAMON NEAR AGUAS BUENAS, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA 4. 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
24... 
0.60 
1.0 
4.4 
0.070 
<1 
<100 
50 
<1 
5 
10 
DEC 
09... 
0.70 
1.5 
6.6 
0.040 
FEB 1986 
14... 
0.30 
0.80 
3.5 
0.020 
MAY 
05... 
0.40 
1.1 
4.9 
0.030 
<1 
<100 
50 
<1 
3 
10 
JUL 
15... 
0.50 
1.3 
5.8 
0.070 
SEP 
04... 
0.40 
1.1 
4.9 
0.040 
MANGA-
METHY-
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELF-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS P6) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
24... 
3500 
2 150 <0.10 
<1 
<1 
20 <0.010 
<1 0.05 
DEC 
09... 
FEB 1986 
14... 
MAY 
05... 
400 
2 
50 <0.10 
<1 
<1 <10 <0.010 
<1 0.06 
JUL 
15... 
SEP 
04... 
I
 
 
         
 
    
 
     
 
 
 
 
  
 
         
           
         
           
 
           
 
          
 
 
 
     
 
         
 
 
 
          
         
          
 
     
 
     
          
 
     
         
142 
RIO DE RAYAMON BASIN 
50047990 RIO GUAYNABO NEAR BAYAMON, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°22'32", long 66°07'59", at bridge on Highway 833, 0.2 i (0.3 km) upstream from Rio de Bayamon, 
and 2.3 mi (3.7 km) southeast of Bayamon plaza. 
DRAINAGE AREA.--73.2 sq mi (189.6 sq km). 
PERIOD OF RECORD.--Water years 1958, 1964, 1971-73, 1976, 1979 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
1CAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MGM 
100 ML) 100 ML) 
OCT 1985 
21... 
1155 
48 
386 
7.60 
25.5 
53 
22 
400000 
4800 
DEC 
23... 
1150 
26 
434 
7.70 
24.0 
1.1 
18 
K8900 
3100 
FEB 1986 
21... 
1250 
19 
490 
7.75 
25.0 
2.0 
3.6 
44 
34 
4000 
400 
APR 
23... 
1250 
20 
506 
7.08 
29.0 
3.2 
3.3 
43 
37 
3000 
710 
JUL 
22... 
1230 
20 
460 
7.40 
29.0 
4.5 
4.1 
53 
35 
20000 
K700 
SEP 
22... 
1350 
19 
523 
7.52 
29.5 
2.5 
3.5 
46 
35 
K15000 
1400 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD-
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
21... 
140 
4 
37 
11 
22 
0.8 
3.7 
134 
<0.5 
12 
29 
DEC 
23... 
160 
FEB 1986 
21... 
156 
APR 
23... 
160 
7 
44 
13 
30 
1 
4.5 
156 
<0.5 
21 
43 
JUL 
22... 
160 
SEP 
22... 
150 
0 
41 
12 
32 
1 
5.0 
163 
16 
39 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
21... 
0.20 
24 
220 
28 
101 
0.530 
0.070 
0.600 
1.00 
0.90 
DEC 
23... 
13 
0.240 
0.060 
0.300 
1.90 
0.70 
FEB 1986 
21... 
1 
0.170 
0.030 
0.200 
2.60 
1.1 
APR 
23... 
0.20 
27 
280 
15 
17 
0.350 
0.050 
0.400 
1.80 
0.70 
JUL 
22... 
3 
0.240 
0.060 
0.300 
2.40 
0.70 
SEP 
22... 
0.10 
28 
270 
14 
9 
0.070 
0.030 
0.100 
3.00 
1.3 
K = non-ideal count 
 
 
    
    
 
          
         
          
    
   
          
   
    
  
 
        
          
        
  
   
 
          
143 
RIO DE BAYAMON BASIN 
50047990 RIO GUAYNABO NEAR BAYAMON, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
21... 
1.9 
2.5 
11 
0.400 
1 
100 
60 
<1 
8 
20 
DEC 
23... 
2.6 
2.9 
13 
0.710 
FEB 1986 
21... 
3.7 
3.9 
17 
0.950 
APR 
23... 
2.5 
2.9 
13 
0.750 
2 
200 
10 
<1 
4 
10 
JUL 
22... 
3.1 
3.4 
15 
1.30 
SEP 
22... 
4.3 
4.4 
19 
1.10 
MANGA-
METHY-
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CH) (UG/L) 
(MG/L) 
OCT 1985 
21... 
4700 
3 420 <0.10 
<1 
<1 
80 <0.010 
1 0.21 
DEC 
23... 
FEB 1986 
21... 
APR 
23... 
760 
<1 
460 
0.10 
<1 
<1 
20 
<0.010 
1 
0.37 
JUL 
22... 
--
SEP 
22... 
 
 
         
 
    
 
     
 
    
        
  
           
 
 
   
 
 
 
          
 
 
 
 
  
 
         
           
         
           
 
 
           
 
          
 
 
 
     
         
 
 
 
          
 
         
     
 
 
     
 
     
          
 
     
          
144 
RIO DE BAYAMON BASIN 
50048510 RIO DE BAYAMON AT FLOOD CHANNEL AT BAYAMON, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°24'29", long 66°09'04", at bridge on Highway 890, 1.0 (1.6 km) downstream from bridge on High­
way 2, and 3.2 mi (5.1 km) above mouth. 
DRAINAGE AREA.--71.9 sq mi (186.2 sq km). 
PERIOD OF RECORD.--Water years 1974 to current year. 
REMARKS.--Prior to 1979 sampling site was 0.8 mile (1.3 km) downstream but was changed because of flood channel 
construction. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
D1S- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
24... 
1315 E450 
222 
7.40 
24.5 4300 
26 37000 36000 
DEC 
27... 
1000 
34 
442 
7.80 
23.0 
7.0 
5.8 
<10 
50000 
2100 
FEB 1986 
21... 
0955 
35 
458 
7.60 
23.0 
2.1 
4.6 
54 
50 
48000 
K1600 
APR 
23... 
0940 42 
485 7.24 26.0 20 
4.4 
54 
17 K20000 40000 
JUL 
22... 
0945 43 
445 7.65 27.5 1.0 
38 K85000 
SEP 
22... 
1025 
37 
465 
7.35 
28.5 
10 
5.8 
75 
24 
20000 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- UNITY 
CHLO-
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD-
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
T1ON 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
24... 
80 
6 
20 
7.4 
13 
0.7 
2.6 
74 
<0.5 
16 
15 
DEC 
27... 
136 
FEB 1986 
21... 
151 
APR 
23... 
150 
7 
39 
13 
24 
0.9 
3.6 
144 
<0.5 
19 
34 
JUL 
22... 
156 
SEP 
22... 
150 
0 
40 
13 
28 
1 
4.1 
158 
20 
31 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
S102) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
24... 
0.10 
20 
140 E170 
528 
0.610 0.090 0.700 0.320 
0.98 
DEC 
27... 
6 
0.410 
0.090 
0.500 
1.40 
0.60 
FEB 1986 
21... 
9 
0.290 
0.110 
0.400 
2.00 
0.80 
APR 
23... 
0.20 
24 
240 
27 
48 
0.470 
0.130 
0.600 
1.20 
0.70 
JUL 
22... 
18 
0.330 
0.170 
0.500 
1.70 
0.70 
SEP 
22... 
0.10 
27 
260 
26 
19 
0.110 
0.090 
0.200 
2.20 
0.70 
E = estimate 
K = non-ideal count 
 
 
    
    
 
          
         
          
    
    
          
    
    
  
 
        
          
        
  
   
 
  
   
 
 
 
       
 
 
 
 
        
       
        
 
  
    
        
       
        
145 
RIO DE BAYAMON BASIN 
50048510 RIO DE BAYAMON AT FLOOD CHANNEL AT BAYAMON, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS 8) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
24... 
1.3 
2.0 
8.9 
0.240 
2 
100 
60 
<1 
15 
40 
DEC 
27... 
2.0 
2.5 
11 
0.690 
FEB 1986 
21... 
2.8 
3.2 
14 
0.830 
APR 
23... 
1.9 
2.5 
11 
0.480 
2 
200 
30 
<1 
20 
10 
JUL 
22... 
2.4 
2.9 
13 
0.770 
SEP 
22... 
2.9 
3.1 
14 
0.910 
MANGA-
METHY-
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
24... 
14000 
5 450 <0.10 
<1 
<1 
40 <0.010 
<1 0.06 
DEC 
27... 
FEB 1986 
21... 
APR 
23... 
2700 
3 310 <0.10 
<1 
<1 
20 <0.010 
<1 0.11 
JUL 
22... 
SEP 
22... 
PESTICIDE ANALYSES 
CHLOR-
DI-
DI-
PCB, ALDRIN DANE, DDD, DDE, DDT, AZINON ELDRIN 
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DATE TIME SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
22... 
0945 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.14 <0.010 
HEPTA-
METH-
ENDO-
HEPTA- CHLOR 
MALA- OXY-
SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, 
DATE 
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
JUL 1986 
22... 
<0.010 
<0.010 
<0.01 
<0.010 
<0.010 
<0.010 
<0.01 
<0.01 
NAPH-
THA-
METHYL METHYL 
LENES, 
PARA-
TRI-
PARA-
POLY-
PER-
TOX-
TRI-
THION, THION, MIREX, THION, CHLOR. THANE APHENE, THION 
DATE 
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
JUL 1986 
22... 
<0.010 
<0.010 
<0.01 
<0.010 
<0.010 
<0.10 
<0.01
<1 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO PUERTO NUEVO BASIN 
50048800 RIO PIEDRAS NEAR RIO PIEDRAS, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18'22'15", long 66°03'40", at bridge on Winston Churchill Avenue in the El Senorial Housing area, 
0.5 mi (0.8 km) west of Highway 176, and 2.5 mi (4.0 km) southwest of Rio Piedras plaza. 
DRAINAGE AREA.--8.17 sq mi (20.9 sq km). 
PERIOD OF RECORD.--Water years 1972 to current year. 
WATER QUALITY DATA, WATER YEAR OCTOBER 1985 TO SFPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM= FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
15... 
1400 
12 
382 
7.80 
26.0 
20 
K8600 
K83 
DEC 
26... 
0915 
9.5 
364 
7.90 
22.0 
4.0 
7.8 
88 
<10 
K21000 
2500 
FEB 1986 
14... 
1030 
6.2 
377 
7.60 
24.0 
15 
13 
4300 
8000 
APR 
18... 
1410 
12 
402 
8.10 
30.5 
2.4 
9.5 
128 
79 
K95000 
48000 
JUL 
18... 
1110 
5.5 
386 
7.55 
29.0 
5.7 
75 
K240000 K150000 
SEP 
12... 
1115 
6.7 
417 
7.65 
26.0 
2.0 
6.4 
80 
51 >1000 K170000 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD- 
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
15... 
130 
11 
34 
12 
24 
0.9 
3.0 
123 
14 
19 
26 
DEC 
26... 
113 
26... 
113 
FEB 1986 
14... 
134 
APR 
18... 
140 
4 
36 
12 
26 
1 
3.0 
135 
<0.5 
15 
29 
JUL 
18... 
143 
SEP 
12... 
140 
0 
36 
11 
27 
1 
3.6 
142 
24 
27 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
15... 
1.3 
31 
220 
7.3 
13 
C.930 
0.07) 
1.00 
0.340 
0.36 
DEC 
26... 
- 
--1.15 
0.050 
1.20 
0.290 
0.31 
26... 
16 
-- 
FEB 1986 
14... 
8 
1.00 
0.100 
1.10 
0.750 
0.35 
APR 
18... 
0.20 
33 
240 
7.4 
5 
0.780 
0.220 
1.00 
0.900 
0.50 
JUL 
18... 
0.600 
0.100 
0.700 
1.40 
0.90 
SEP 
12... 
0.20 
30 
240 
4.4 
10 
0.620 
0.180 
0.800 
2.70 
1.7 
K = non-ideal count 
146 
 
 
    
    
 
          
         
     
 
    
     
   
          
    
    
  
 
        
          
        
 
 
 
  
   
 
 
 
         
 
 
 
 
        
       
 
  
    
        
147 
RIO PUERTO NUEVO BASIN 
50048800 RIO PIEDRAS NEAR RIO PIEDRAS, PR--Continued 
WATER QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
15... 
0.70 
1.7 
7.5 
0.240 
30 
10 
DEC 
26... 
0.60 
1.8 
8.0 
0.140 
26... 
--
--
--
--
--
FEB 1986 
14... 
1.1' 
2.2 
9.7 
0.280 
APR 
18... 
1.4 
2.4 
11 
0.330 
6 
200 
10 
<1 
18 
<10 
JUL 
18... 
2.3 
3.0 
13 
0.500 
SEP 
12... 
4.4 
5.2 
23 
1.50 
MANGA-
METHY-
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL. 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
15... 
2200 
170 
50 <0.010 
<1 0.19 
DEC 
26... 
26... 
FEB 1986 
14... 
APR 
18... 
270 
3 190 <0.10 
<1 
<1 
30 <0.010 
2 0.27 
JUL 
18... 
SEP 
12... 
PESTICIDE ANALYSES 
CHLOR-
DI-
DI-
PCB, ALDRIN, DANE, ODD, DDE, DDT, AZINON, ELDRIN 
DATE 
TIME 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
18... 
1110 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.12 <0.010 
HEPTA-
METH-
ENDO-
HEPTA- CHLOR 
MALA- OXY-
SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, 
DATE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
JUL 1986 
18... <0.010 <0.010 <0.01 <0.010 <0.010 <0.010 0.01 <0.01 
NAPH-
THA-
METHYL METHYL 
LENES, 
PARA-
TRI-
PARA-
POLY-
PER-
TOX-
TOTAL 
THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI­
DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
18... 
<0.01 
<0.01 
<0.01 
<0.01 
<0.10 
<0.1 
<1 
<0.01 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO PUERTO NUEVO BASIN 
50049100 RIO PIEDRAS AT HATO REY, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°24'34", long 66°04'101, at bridge on Avenida Piniero at Expreso Las Americas, and 0.8 mi 
(1.3 km) southwest of Hato Rey. 
DRAINAGE AREA.--15.4 sq mi (39.9 sq km). 
PERIOD OF RECORD.--Water years 1971 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
D1S- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
!CAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) (US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
15... 
0945 
17 
422 
7.60 
26.5 
2.7 
17 
K84000 
4500 
DEC 
26... 
1240 
17 
430 
7.90 
25.0 
3.5 
13 
42000 
20000 
FEB 1986 
14... 
1330 16 
485 7.70 25.5 17 
29 430000 33000 
APR 
18... 
1115 
4.3 
464 
7.80 
27.5 25 
6.8 
87 
27 K130000 K11000 
JUL 
18... 
0915 
14 
396 
7.65 
28.0 
15 
6.2 
80 
16 
31000 K1300000 
SEP 
12... 
0835 
14 
422 
7.80 
27.0 
1.8 
5.7 
72 
10 
28000 
3200 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- UNITY 
CHLO- 
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD- 
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
15... 
150 
9 
42 
11 
25 
0.9 
3.5 
141 
<0.5 
22 
27 
DEC 
26... 
131 
FEB 1986 
14... 
156 
APR 
18... 
160 
8 
44 
12 
32 
1 
3.7 
151 
<0.5 
17 
37 
JUL 
18... 
15 
SEP 
12... 
150 
5 
44 
10 
26 
1 
3.5 
146 
25 
29 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
5102) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
15... 
0.50 
27 
240 
11 
12 
0.910 
0.190 
1.10 
1.00 
0.60 
DEC 
26... 
4 
1.10 
0.100 
1.20 
0.610 
0.49 
FEB 1986 
14... 
5 
1.18 
0.220 
1.40 
1.10 
0.90 
APR 
18... 
0.20 
31 
270 
3.1 
5 
1.05 
0.350 
1.40 
0.920 
0.58 
JUL 
18... 
12 
0.770 
0.130 
0.900 
0.190 
0.51 
SEP 
12... 
0.20 
26 
250 
9.5 
3 
0.940 
0.160 
1.10 
0.260 
0.64 
K = non-ideal count 
148 
 
 
    
    
 
          
         
          
    
   
          
    
    
  
 
        
          
        
         
          
149 
RIO PUERTO NUEVO BASIN 
50049100 RIO PIEDRAS AT HATO REY, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N), 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
15... 
1.6 
2.7 
12 
0.340 
1 
200 
60 
3 
8 
10 
DEC 
26... 
1.1 
2.3 
10 
0.400 
FEB 1986 
14... 
2.0 
3.4 
15 
0.640 
APR 
18... 
1.5 
2.9 
13 
0.630 
2 
200 
10 
<1 
7 
20 
JUL 
18... 
0.70 
1.6 
7.1 
0.320 
SEP 
12... 
0.90 
2.0 
8.9 
0.430 
MANGA-
METHY-
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
15... 
670 
4 
190 
<0.10 
<1 
<1 
40 
<0.010 
<1 
0.13 
DEC 
26... 
FEB 1986 
14... 
APR 
18... 
310 
1 
160 
<0.10 
<1 
<1 
10 
<0.010 
2 
0.12 
JUL 
18... 
SEP 
12... 
 
 
 
 
       
  
   
          
           
          
  
     
 
 
     
 
 
     
 
           
  
     
 
  
     
 
150 
RIO PUERTO NUEVO BASIN 
50049820 
LAGUNA SAN JOSE NO. 2 AT SAN JUAN, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°25'46", long 66°02'10", 0.2 mi (0.3 km) east of Cana de Martin Pena, and 650 ft (200 m) 
south of Isla Guachinango. 
DRAINAGE AREA.--Indeterminate. 
PERIOD OF RECORD.--Water years 1974 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985, TO SEPTEMBER 1986 
DEPTH 
OXYGEN, 
COLI-
STREP-
ALKA­
AT 
SPE-
TRANS-
DIS-
FORM, 
TOCOCCI 
LINITY 
SAMPLE 
CIFIC 
PAR-
SOLVED 
FECAL, 
FECAL, 
WATER 
LOC-
CON-
PH 
TEMPER-
ENCY 
OXYGEN, 
(PER-
0.7 
KF AGAR 
TOTAL 
ATION, 
DUCT-
(STAND-
ATURE 
(SECCHI 
DIS-
CENT 
UM-MF 
(COLS. 
FIELD 
DATE 
TIME 
TOTAL 
ANCE 
ARD 
WATER 
DISK) 
SOLVED 
SATUR-
(COLS./ 
PER 
MG/L AS 
(FEET) 
(US/CM) 
UNITS) 
(DEG C) 
(IN) 
(MG/L) 
ATION) 
100 ML) 
100 ML) 
CAC03 
NOV 1985 
07... 
1310 
1.00 
10100 
8.80 
31.0 
12.5 
14.1 
5200 
<100 
114 
DEC 
27... 
0900 
1.00 
14600 
8.80 
25.5 
10.5 
4.4 
57 
K96000 
4400 
128 
FEB 1986 
28... 
0850 
1.00 
30700 
8.24 
23.0 
15.0 
2.2 
29 
K1100 
<100 
312 
MAY 
14... 
1220 
1.00 
9500 
8.80 
27.5 
7.20 
8.2 
108 
45000 
82 
JUL 
25... 
0850 
1.00 
24400 
8.45 
30.0 
14.8 
0.7 
10 
200000 
2400 
136 
SEP 
25... 
0915 
1.00 
26200 
8.06 
29.0 
14.4 
0.2 
3 
K13000 
7500 
147 
SOLIDS, 
NITRO-
RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
MONIA + 
NITRO-, NITRO-
PHOS-
CARBON, 
DEG. C, NITRATE NITRITE ND2+NO3 AMMONIA ORGANIC ORGANIC 
GEN, 
GEN, 
PHORUS, ORGANIC 
SUS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
DATE 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS C) 
NOV 1985 
07... 
23 
0.030 
<0.100 
0.290 
2.2 
2.5 
0.550 
19 
DEC 
27... 
43 
0.040 
<0.100 
1.10 
4.7 
5.8 
0.680 
16 
FEB 1986 
28... 
36 
0.030 
<0.100 
1.10 
3.3 
4.4 
0.950 
22 
MAY 
14... 
20 
0.080 
0.020 
0.100 
0.290 
2.1 
2.4 
2.5 
11 
0.540 
20 
JUL 
25... 
34 
0.020 
<0.100 
0.190 
2.5 
2.7 
0.570 
17 
SEP 
25... 
32 
0.010 
<0.100 
0.570 
0.0 
0.30 
0.930 
15 
K = non-ideal count 
 
          
 
   
 
          
           
 
          
           
          
          
           
           
  
     
 
151 
RIO PUERTO NUEVO BASIN 
50049920 BAHIA DE SAN JUAN NO. 5 AT SAN JUAN, PR 
WATER-QUALITY RECORDS 
LOCATION--Lat 18°26'37", long 66°05'11", 0.4 mi (0.6 km) west of Puente de la Constitucion, and 0.5 mi 
(0.8 km) south from U.S. Naval Reservation. 
DRAINAGE--Indeterminate. 
PERIOD OF RECORD--Water years 1974 to present. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
WATER QUALITY DATA 
DEPTH 
OXYGEN, 
COLT-
STREP-
ALKA­
AT 
SPE-
TRANS-
DIS-
FORM, 
TOCOCCI 
LINITY 
SAMPLE 
CIFIC 
PAR-
SOLVED 
FECAL, 
FECAL, 
WATER 
LOC-
CON-
PH 
TEMPER-
ENCY 
OXYGEN, 
(PER-
0.7 
KF AGAR 
TOTAL 
ATION, 
DUCT-
(STAND-
ATURE 
(SECCHI 
DIS-
CENT 
UM-MF 
(COLS. 
FIELD 
DATE 
TIME 
TOTAL 
ANCE 
ARD 
WATER 
DISK) 
SOLVED 
SATUR-
(COLS./ 
PER 
MG/L AS 
(FEET) 
(US/CM) 
UNITS) 
(DEG C) 
(IN) 
(MG/L) 
ATION) 
100 ML) 
100 ML) 
CAC03 
NOV 1985 
07... 
1515 
1.00 
38200 
8.00 
31.0 
26.3 
3.8 
K15000 
K500 
126 
DEC 
27... 
1035 
1.00 
41800 
8.10 
25.5 
36.0 
5.2 
74 
K28000 
K400 
127 
FEB 1986 
28... 
1135 
1.00 
44000 
7.85 
29.0 
11.0 
3.8 
58 
K15000 
<100 
107 
MAY 
14... 
1415 
1.00 
11100 
7.60 
26.5 
7.20 
4.2 
54 
57000 
97 
JUL 
25... 
1040 
1.00 
12800 
7.35 
30.0 
22.3 
5.3 
73 
K98000 
8000 
108 
SEP 
25... 
1050 
1.00 
45000 
7.59 
29.5 
34.8 
2.1 
32 
K110000 
K17000 
133 
SOLIDS, 
NITRO-
RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
MONIA + 
NITRO-
NITRO-
PHOS-
CARBON, 
DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC 
GEN, 
GEN, 
PHORUS, ORGANIC 
SUS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
DATE 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS C) 
NOV 1985 
07... 
89 
0.070 
0.030 
0.100 
1.10 
0.20 
1.3 
1.4 
6.2 
0.160 
5.0 
DEC 
27... 
76 
0.160 
0.040 
0.200 
1.10 
0.20 
1.3 
1.5 
6.6 
0.180 
3.1 
FEB 1986 
28... 
77 
0.070 
0.030 
0.100 
0.770 
0.43 
1.2 
1.3 
5.8 
0.190 
4.7 
MAY 
14... 
70 
0.260 
0.040 
0.300 
0.680 
0.82 
1.5 
1.8 
8.0 
0.280 
11 
JUL 
25... 
16 
0.310 
0.090 
0.400 
0.880 
0.62 
1.5 
1.9 
8.4 
0.290 
7.5 
SEP 
25... 
39 
0.030 
<0.100 
1.10 
0.70 
1.8 
0.310 
5.1 
K = non-ideal count 
 
 
 
  
 
 
 
 
153 
SAN JUAN 
OC EAN 
Laguna 
V 
LO1ZA ALDEA 
Son Jose 
Coastal basin 
Coastal basin 
AR LINA 
RIO GRANDE 
A OVA N
▪AS 
TRUJI O ALTO 
Drainage boundary 
Espiritu 
Santo basin 
ago Lolia 
Rio 
0554 
AGUAS BUENAS 
▪CAGUAS 
LAS 
PIEDRAS 
Anton Ruiz 
basin 
05O50 
051180 
051150 
Dronoge boundary 
Rio de la Plata 
basin 
Rio Humacao basin 
EXPLANATION 
A0509 SURFACE—WATER STATION 
AND NUMBER 
,::•radide 
de PutiUds basin 
v0554 QUALITY—OF—WATER 
STATION AND NUMBER 
).MAYAGUEZ 
Map area 
JUAPe 
04iPt 
cierauA0 
0• 
Rio Guayones basin 
3 
4 
5 KILOMETERS 
v0588 
.222 
QUALITY—OF—WATER 
PARTIAL RECORD 
STATION AND NUMBER 
WELL AND WELL NUMBER 
C • 
GUAYANA. 
1 
5 MILES 
Figure 18.--Rio Grande de Loiza basin. 
 
 
         
 
    
 
     
 
 
 
 
 
  
 
         
           
         
           
 
           
 
          
 
 
 
     
         
 
 
          
         
 
  
 
     
 
     
          
 
     
          
154 
RIO GRANDE DE LOIZA BASIN 
50050300 QUEBRADA BLASINA NEAR CAROLINA, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°23'27", long 65°58'28", at bridge on Highway 3, 1.4 mi (2.3 km) south of Valle Arriba Heights 
housing area, and 1.2 mi (1.9 km) west-southwest of Carolina plaza. 
DRAINAGE AREA.--2.96 sq mi (7.67 sq km). 
PERIOD OF RECORD.--Water years 1973 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
29... 
1335 
2370 
111 
6.70 
28.0 
850 
7,8 
99 
69 
K1100000 
43000 
DEC 
11... 
1500 
E250 
250 
7.90 
26.0 
40 
7.8 
96 
<10 
K150000 
340 
FEB 1986 
03... 
1150 
92 
263 
8.00 
23.5 
15 
7.9 
93 
23 
K9500 
K1500 
APR 
16... 
1300 
63 
278 
7.70 
28.0 
15 
7.5 
97 
28 
25000 
K170 
JUL 
15... 
1055 
113 
211 
7.65 
28.5 
27 
7.6 
99 
18 
K16000 
440 
SEP 
09... 
1120 
76 
241 
7.65 
30.0 
21 
7.6 
101 
<10 
20000 
200 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD-
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
29... 
29 
0 
6.5 
3.0 
8.0 
0.7 
1.0 
29 
<0.5 
7.3 
7.5 
DEC 
11... 
64 
FEB 1986 
03... 
78 
APR 
16... 
77 
0 
18 
7.8 
23 
1 
2.4 
80 
<0.5 
15 
23 
JUL 
15... 
68 
SEP 
09... 
71 
0 
17 
7.0 
21 
1 
2.2 
76 
14 
16 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
29... 
<0.10 18 
69 439 
708 0.270 0.130 0.400 0.260 1.6 
DEC 
11... 
62 
0.370 
0.030 
0.400 
0.070 
0.33 
FEB 1986 
03... 
34 
0.450 
0.050 
0.500 
0.140 
0.46 
APR 
16... 
0.10 
32 
170 
29 
22 
0.600 
0.100 
0.700 
0.410 
0.59 
JUL 
15... 
18 
0.260 
0.040 
0.300 
0.130 
0.37 
SEP 
09... 
0.20 
35 
160 
32 
22 
0.330 
0.070 
0.400 
0.140 
0.36 
K = non-ideal count 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO GRANDE DE LOIZA BASIN 
50050300 QUEBRADA BLASINA NEAR CAROLINA, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
29... 
1.9 
2.3 
10 
0.370 
1 
200 
50 
1 
14 
50 
DEC 
11... 
0.40 
0.80 
3.5 
0.090 
FEB 1986 
03... 
0.60 
1.1 
4.9 
0.210 
APR 
16... 
1.0 
1.7 
7.5 
0.310 
<1 
<100 
10 
<1 
1 
30 
JUL 
15... 
0.50 
0.80 
3.5 
0.140 
SEP 
09... 
0.50 
0.90 
4.0 
0.200 
MANGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
29... 
19003 
17 
740 
0.10 
<1 
<1 
70 
<0.010 
<1 
0.04 
DEC 
11... 
FEB 1986 
03... 
APR 
16... 
940 
1 
260 
0.10 
<1 
<1 
20 
<0.010 
3 
0.15 
JUL 
15...
-- 
SEP 
09... 
155 
I
I
I
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
156 
RIO GRANDE DE LOIZA BASIN 
50050900 RIO GRANDE DE LOIZA AT QUEBRADA ARENAS, PR 
LOCATION.--Lat 18°07'10", long 65°59'22", Hydrologic Unit 21010005, at intersection of Highways 181 and 9990, 
0.2 mi (0.3 km) upstream from confluence with Rio Emajagua and about 7.1 mi (11.4 km) southwest of San Lorenzo. 
DRAINAGE AREA.--6.00 mi' (15.54 km2 ). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--October 1977 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 175 ft (53 
), from topographc map. 
REMARKS.--No estimated daily discharges during water year. Records fair. 
AVERAGE DISCHARGE.--9 years (1978-86), 31.1 ft'is (0.881 '/s), 70.39 in/yr (1,788 m/yr), 22,530 acre-ft/yr 
(27.78 he/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 11,700 ft'A (331 m'/s), Nov. 5, 1983, gage height, 14.78 ft 
(4.505 m), from rating curve extended above 500 ft'is (14.2 m'/s) on basis of step-backwater analysis; minimum 
discharge, 2.8 ft'/s (0.079 m 3 /s), May 5, 6, 1979. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft'is (56.6 m'/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(W/s) 
(m 3 /s) 
(ft) 
(m) 
Date 
Time 
(ft'/s) 
(80/s) 
(ft) 
(m) 
Oct. 
6 
1015 
*3,850 
109 
*10.01 3.051 
May 
18 
1115 
2,950 
83.5 
9.21 2.807 
Oct. 24 
0815 
2,040 
57.8 
8.25 
2.515 
May 
31 
0400 
2,640 
74.8 
8.90 
2.713 
Apr. 29 
1515 
2,910 
82.4 
9.17 
2.795 
June 10 
0130 
2,150 
60.9 
8.37 2.551 
May 
13 
0830 
3,020 
85.5 
9.28 2.828 
Minimum discharge, 6.5 ft'is (0.184 m'/s), Mar. 23, 24. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1905 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
2 
3 
4 
5 
76 
43 
63 
71 
80 
58 
44 
38 
33 
32 
16 
15 
15 
14 
18 
13 
13 
15 
19 
13 
11 
9.7 
13 
16 
16 
8.5 
7.9 
7.8 
8.6 
9.6 
22 
16 
15 
60 
40 
20 
16 
19 
16 
13 
28 
30 
26 
22 
22 
16 
14 
14 
13 
13 
9.9 
9.4 
9.0 
10 
9.3 
15 
13 
11 
11 
22 
6 
7 
8 
9 
10 
1250 
470 
151 
83 
64 
30 
27 
25 
24 
23 
17 
15 
14 
14 
15 
12 
11 
11 
45 
20 
11 
10 
9.8 
9.1 
8.9 
8.6 
8.5 
7.7 
7.6 
7.4 
23 
16 
20 
16 
12 
41 
41 
50 
25 
205 
22 
20 
20 
49 
214 
23 
17 
13 
12 
11 
8.5 
17 
16 
9.7 
9.2 
12 
10 
9.6 
9.3 
8.7 
11 
12 
13 
14 
15 
51 
43 
37 
34 
32 
22 
43 
34 
26 
27 
14 
23 
16 
14 
14 
16 
14 
12 
12 
11 
9.0 
9.0 
8.6 
8.3 
8.3 
8.3 
8.1 
11 
14 
14 
11 
11 
11 
11 
10 
91 
31 
197 
138 
36 
27 
23 
32 
27 
26 
15 
17 
12 
12 
15 
30 
12 
34 
19 
12 
8.0 
8.0 
9.4 
8.5 
7.9 
16 
17 
18 
19 
20 
30 
46 
60 
36 
29 
26 
28 
83 
29 
29 
14 
14 
13 
15 
16 
11 
16 
15 
12 
12 
8.3 
9.1 
9.1 
36 
18 
9.2 
8.2 
7.7 
7.3 
7.4 
9.9 
9.4 
8.7 
8.5 
8.7 
28 
43 
245 
52 
3/ 
25 
21 
18 
42 
21 
13 
11 
11 
10 
9.8 
11 
9.8 
9.2 
8.8 
8.5 
7.6 
7.3 
7.0 
7.1 
7.0 
21 
22 
23 
24 
25 
28 
27 
139 
236 
79 
24 
21 
20 
19 
18 
13 
13 
14 
17 
15 
17 
12 
12 
26 
15 
11 
9.8 
9.2 
9.0 
9.4 
7.1 
7.0 
6.9 
7.0 
7.0 
8.8 
9.6 
8.3 
8.5 
8.3 
47 
62 
34 
29 
26 
18 
17 
16 
16 
15 
11 
9.7 
9.7 
9.1 
9.1 
7.8 
7.9 
8.0 
9.5 
9.5 
6.9 
9.9 
13 
55 
40 
26 
27 
28 
29 
30 
31 
160 
66 
45 
167 
54 
70 
17 
17 
17 
16 
17 
---
14 
13 
13 
12 
12 
11 
12 
11 
11 
11 
11 
11 
8.8 
8.6 
8.7 
---
10 
9.9 
11 
197 
26 
27 
8.7 
9.6 
33 
226 
37 
---
25 
25 
24 
58 
25 
172 
15 
18 
16 
14 
13 
---
1.2 
9.8 
9.0 
8.6 
18 
11 
7.9 
7.4 
89 
280 
22 
20 
24 
13 
11 
9.8 
9.0 
---
TOTAL 
MEAN 
MAX 
MIN 
CFSM 
IN. 
AC-FT 
3820 
123 
1250 
27 
20.5 
23.68 
7580 
867 
28.9 
83 
16 
4.82 
5.38 
1720 
453 
14.6 
23 
11 
2.43 
2.81 
899 
452 
14.6 
45 
11 
2.43 
2.80 
897 
312.7 
11.2 
36 
8.3 
1.87 
1.94 
620 
493.3 
15.9 
197 
6.9 
2.65 
3.06 
978 
697.0 
23.2 
226 
8.3 
3.87 
4.32 
1380 
1871 
60.4 
245 
13 
10.1 
11.60 
3710 
873 
29.1 
214 
13 
4.85 
5.41 
1730 
386.0 
12.5 
23 
8.6 
2.08 
2.39 
766 
731.3 
23.6 
280 
7.4 
3.93 
4.53 
1450 
391.0 
13.0 
55 
6.9 
2.17 
2.42 
776 
CAL YR 1985 
WTR YR 1986 
TOTAL 
TOTAL 
12865.5 
11347.3 
MEAN 
MEAN 
35.2 
31.1 
MAX 
MAX 
1250 
1250 
MIN 
MIN 
7.5 
6.9 
CFSM 
CFSM 
5.87 
5.18 
IN. 
IN. 
79.77 
70.35 
AC-FT 
AC-FT 
25520 
22510 
 
 
 
  
 
   
  
    
   
   
157 
RIO GRANDE DE LOIZA BASIN 
50050900 RIO GRANDE DE LOIZA AT QUEBRADA ARENAS, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON- TEMPERA-
STREAMFLOW, 
SPECIFIC CON- TEMPERA-
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
DEC, 03 1228 
15 
148 
24.5 
SEP, 16 1206 
8.0 
160 
28.0 
AUG, 20 1304 
8.5 
157 
28.5 
I
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
158 
RIO GRANDE DE LOIZA BASIN 
50051150 QUEBRADA BLANCA AT EL JAGUAL, PR 
LOCATION.--Lat 18°09'40", long 65°58'58", Hydrologic Unit 21010005, 0.1 mi (0.2 km) upstream from bridge on 
Highway 181, and 2.8 mi (4.5 km) southwest of San Lorenzo. 
DRAINAGE AREA.--3.25 Si' (8.42 km?). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--October 1984 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 459 ft (140 
), from topographic map. 
REMARKS.--Estimated daily discharges: Oct. 8-11, Oct. 19 to Nov. 6, Nov. 25 to Dec. 2 and Sept. 15-29. 
Records fair except those for estimated daily discharges, which are poor. 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 7,400 ft'is (210 m'/s), May 17, 1985, gage height, 14.58 ft 
(4.444 m), from floodmark, from rating curve extended above 400 ft'is (11.3 m'/s) on basis of step-backwater 
analysis and slope-area measurement; minimum discharge, 0.46 ft'/s (0.013 80/s), May 8, 1985. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 ft'is (28.3 m'/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time (ft'/s) (m0/s) (ft) (m) 
Date Time (W/s) (e/s) (ft) (m) 
Oct. 
6 
2330 
1,690 
47.9 
9.24 
2.816 
May 
13 
0815 
*3,180 
90.0 
*11.10 3.383 
May 
8 
1645 
2,600 
73.6 
10.39 3.167 
May 
13 
2400 
2,610 
73.9 
10.41 3.173 
Minimum discharge, 1.2 ft'is (0.034 m'/s), Apr. 23-26. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
6.3 
15 
4.8 
3.8 
4.0 
2.1 
2.3 
5.9 
3.7 
1.8 
1.9 
3.1 
2 
15 
10 
4.6 
3.8 
3.1 
2.1 
1.8 
2.6 
3.8 
1.8 
1.9 
2.3 
3 
11 
8.6 
4.6 
3.5 
3.3 
2.0 
2.0 
2.1 
3.0 
1.9 
1.9 
1.8 
4 
23 
8.0 
4.4 
3.6 
5.6 
1.8 
5.3 
1.9 
2.5 
1.8 
1.9 
1.7 
5 
31 
10 
7.1 
3.3 
4.5 
1.8 
5.3 
1.8 
2.2 
1.8 
2.0 
1.6 
6 
434 
8.0 
5.5 
3.1 
3.5 
1.8 
3.6 
2.2 
2.1 
3.5 
2.0 
1.6 
7 
237 
7.2 
4.8 
3.1 
3.2 
1.7 
2.3 
3.6 
2.1 
2.2 
2.7 
1.5 
8 
70 
6.7 
4.4 
3.3 
2.9 
1.7 
3.2 
121 
2.3 
1.9 
2.5 
1.4 
9 
20 
6.5 
4.4 
13 
2.8 
1.7 
2.9 
20 
3.0 
1.8 
2.1 
1.4 
10 
15 
6.2 
4.9 
5.0 
2.7 
1.7 
2.0 
43 
12 
1.8 
3.6 
1.4 
11 
11 
6.1 
5.0 
3.7 
2.8 
1.8 
1.8 
47 
2.5 
2.5 
4.4 
1.3 
12 
10 
17 
5.4 
3.3 
2.7 
1.7 
1.7 
13 
2.2 
2.4 
2.5 
1.3 
13 
9.0 
9.3 
4.4 
3.1 
2.6 
1.9 
1.6 
161 
4.3 
1.9 
4.3 
1.5 
14 
7.9 
8.3 
4.2 
2.9 
2.5 
2.1 
1.5 
78 
4.7 
2.4 
3.5 
1.4 
15 
7.1 
32 
4.2 
2.9 
2.4 
3.4 
1.6 
7.3 
3.2 
2.1 
2.4 
1.3 
16 
6.9 
15 
4.0 
2.8 
2.4 
1.8 
1.7 
4.7 
3.0 
1.9 
2.1 
1.4 
17 
6.9 
14 
3.9 
4.7 
2.5 
1.6 
1.6 
4.0 
3.0 
1.8 
1.9 
1.3 
18 
49 
48 
4.0 
3.2 
2.7 
1.5 
1.4 
17 
2.4 
1.8 
1.8 
1.4 
19 
110 
15 
4.0 
2.8 
2.7 
1.5 
1.4 
6.8 
2.7 
1.9 
1.8 
1.3 
20 
10 
13 
4.3 
2.6 
2,4 
1.5 
1.6 
4.6 
2.2 
2.0 
1.6 
1.3 
21 
8.0 
15 
4.0 
2.8 
2.4 
1.4 
1.6 
4.0 
2.1 
2.2 
1.6 
1.4 
22 
7.0 
9.1 
3.8 
2.6 
2.2 
1.4 
1.4 
3.7 
2.0 
1.9 
1.8 
1.5 
23 
70 
8.0 
3.8 
2.5 
2.2 
1.4 
1.3 
2.8 
1.9 
1.8 
2.1 
1.7 
24 
80 
7.0 
3.9 
2.7 
2.2 
1.4 
1.3 
2.5 
1.9 
1.8 
1.9 
12 
25 
40 
6.4 
3.9 
2.4 
2.2 
1.6 
1.3 
2.2 
1.8 
1.8 
1.8 
8.0 
26 
45 
6.0 
3.7 
2.3 
2.2 
1.9 
1.3 
2.2 
1.8 
7.8 
1.8 
3.5 
27 
25 
5.6 
3.6 
2.2 
2.1 
1.6 
1.6 
2.1 
1.8 
1.8 
1.8 
2.5 
28 
19 
5.4 
3.7 
2.2 
2.2 
1.4 
2.4 
2.1 
1.8 
1.9 
5.9 
1.8 
29 
34 
5.0 
3.5 
6.3 
---
4.6 
35 
2.6 
1.8 
1.8 
77 
1.7 
30 
20 
5.4 
3.4 
3.4 
2.3 
5.1 
2.1 
1.8 
2.5 
4.1 
1.8 
31 
45 
---
3.4 
9.2 
2.1 
---
26 
---
2.2 
2.5 
---
TOTAL 
1483.1 
336.8 
133.6 
116.1 
79.0 
58.3 
98.9 
599.8 
85.6 
62.5 
151.1 
67.2 
MEAN 
47.8 
11.2 
4.31 
3.75 
2.82 
1.88 
3.30 
19.3 
2.85 
2.02 
4.87 
2.24 
MAX 
434 
48 
7.1 
13 
5.6 
4.6 
35 
161 
12 
3.5 
77 
12 
MIN 
6.3 
5.0 
3.4 
2.2 
2.1 
1.4 
1.3 
1.8 
1.8 
1.8 
1.6 
1.3 
CFSM 
14.7 
3.45 
1.33 
1:15 
.87 
.58 
1.02 
5.94 
.88 
.62 
1.50 
.69 
IN. 
16.98 
3.86 
1.53 
1.33 
.90 
.67 
1.13 
6.87 
.98 
.72 
1.73 
.77 
AC-FT 
2940 
668 
265 
230 
157 
116 
196 
1190 
170 
124 
300 
133 
CAL YR 1985 
TOTAL 
3895.48 
MEAN 
10.7 
MAX 
434 
MIN 
.51 
CFSM 
3.29 
IN. 
44.59 
AC-FT 
7730 
WTR YR 1986 
TOTAL 
3272.0 
MEAN 
8.96 
MAX 
434 
MIN 
1.3 
CFSM 
2.76 
IN. 
37.45 
AC-FT 
6490 
 
 
 
  
 
   
  
   
159 
RIO GRANDE DE LOIZA BASIN 
50051150 QUEBRADA BLANCA AT EL JAGUAL, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--JANUARY 1985 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON- TEMPERA-
STREAMFLOW, 
SPECIFIC CON- TEMPERA-
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
DEC, 03 1014 
4.7 
256 
24.0 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
 
 
   
 
 
   
RIO GRANDE DE LOIZA BASIN 
50051180 QUEBRADA SALVATIERRA NEAR SAN LORENZO, PR 
LOCATION.--Lat 18°10'24", long 65°58'38", Hydrologic Unit 21010005, on left downstream side of bridge on 
Highway 181, 0.2 mi (0.3 km) upstream from Rio Grande de Loiza, and 1.5 mi (2.4 km) southwest of San Lorenzo. 
DRAINAGE AREA.--3.74 mi' (9.69 km 2 ). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--January 1984 to current year. 
GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 330 ft (100 m), from topographic map. 
REMARKS.--Estimated daily discharges: Oct. 8-22, Apr. 12-15 and Aug. 31 to Sept. 22. REcords fair except those for 
estimated daily dicharges, which are poor. 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,320 ft'A (264 m 3/s), May 17, 1985, gage height, 17.10 ft 
(5.212 a), from floodmark, from rating curve extended above 200 ft'is (5.66 10/s) on basis of step-backwater 
analysis and slope-area measurement; minimum discharge, 0.69 ft'is (0.020 10/s), Apr. 9-13, 15, 16, 1984. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 ft'/s (28.3 80/s) 
Discharge 
Discaarge 
Date 
Gage height 
Time 
(W/s) 
(10/s) 
Date 
(ft) 
(m) 
Time 
(ft'/s) 
(e/s) 
and maximum (*): 
Gage height 
(ft) 
(m) 
Oct. 6 
1045 
1,980 
56.1 
10.39 3.167 
May 13 
0815 
*4,070 
115 
*13.17 4.014 
May 8 
1645 
1,450 
41.1 
9.37 2.856 
May 14 
0U15 
1,480 
41.9 
9.43 2.874 
Minimum discharge, 1.0 ft'is (0.028 m 3/s), July 23-26, Aug. 4-7, 22, 27, 28. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
5.1 
15 
2.9 
3.0 
3.4 
1.3 
1.8 
2.9 
6.2 
1.7 
1.4 
3.5 
2 
7.3 
9.6 
2.8 
3.3 
2.4 
1.3 
1.4 
1.9 
5.8 
1.7 
1.5 
2.0 
3 
9.2 
7.6 
3.4 
2.7 
2.7 
1.1 
2.7 
1.7 
5.2 
2.2 
1.2 
1.8 
4 
16 
6.5 
4.2 
3.0 
2.4 
1.2 
2.6 
1.6 
3.7 
1.6 
1.1 
1.7 
5 
28 
8.4 
6.8 
2.6 
2.4 
1.4 
6.2 
1.5 
3.2 
1.5 
1.0 
3.0 
6 
353 
6.5 
5.8 
2.5 
2.0 
1.3 
3.3 
2.6 
2.8 
3.0 
1.1 
2.0 
7 
143 
5.3 
4.9 
2.4 
2.0 
1.3 
1.7 
6.3 
2.8 
1.9 
1.8 
1.7 
8 
26 
4.8 
4.2 
2.6 
1.9 
1.2 
4.4 
74 
2.7 
1,5 
2.2 
1.5 
9 
20 
4.4 
4.1 
10 
1.8 
1.2 
2.4 
15 
13 
1.4 
1.5 
1.3 
10 
13 
4.3 
4.1 
5.5 
1.8 
1.2 
1.5 
27 
34 
1.4 
2.8 
1.2 
11 
10 
4.2 
4.4 
3.6 
1.9 
1.3 
1.4 
32 
4.1 
1.7 
7.5 
1.3 
12 
8.0 
16 
4.2 
2.9 
1.9 
1.2 
1.3 
12 
3.2 
2.0 
2.2 
1.1 
13 
6.6 
7.9 
3.7 
2.8 
1.7 
1.4 
1.5 
146 
9.2 
1.4 
8.6 
1.5 
14 
5.8 
12 
3.5 
2.6 
1.6 
1.5 
1.3 
100 
9.6 
1.5 
4.7 
1.2 
15 
5.4 
72 
3.6 
2.5 
1.6 
5.8 
1.2 
15 
4.1 
1.7 
2.3 
1.1 
16 
5.0 
22 
3.5 
2.4 
1.6 
1.8 
1.5 
7.8 
3.7 
1.4 
1.7 
1.2 
17 
5.2 
14 
3.3 
7.2 
1.7 
1.5 
1.6 
5.5 
3.1 
1.4 
1.4 
1.2 
18 
10 
56 
3.4 
3.3 
1.8 
1.4 
1.2 
26 
2.6 
1.4 
1.3 
1.1 
19 
5.6 
13 
3.4 
2.6 
1.7 
1.4 
1.2 
12 
3.2 
1.2 
1.3 
1.1 
20 
5.2 
9.6 
3.7 
2.5 
1.5 
1.3 
1.2 
7.2 
2.4 
1.3 
1.2 
1.1 
21 
5.0 
22 
3.2 
2.6 
1.5 
1.3 
1.3 
5.6 
1.9 
1.5 
1.1 
1.2 
22 
4.9 
7.3 
3.0 
2.4 
1.4 
1.3 
1.2 
4.8 
1.7 
1.2 
3.0 
1.1 
23 
86 
5.6 
3.2 
2.0 
1.4 
1.3 
1.2 
4.0 
1.8 
1.1 
1.7 
1.7 
24 
94 
4.6 
3.5 
2.1 
1.4 
1.3 
1.2 
3,3 
2.1 
1.1 
1.4 
12 
25 
40 
4.1 
3.3 
2.0 
1.4 
1.6 
1.2 
3.1 
1.8 
1.2 
2.1 
9.7 
26 
45 
3.8 
3.1 
1.9 
1.4 
2.0 
1.2 
2.9 
1.8 
1.1 
1.2 
3.9 
27 
30 
3.5 
2.8 
1.8 
1.3 
1.5 
1.7 
2.7 
1.8 
1.3 
1.1 
3.0 
28 
19 
3.3 
2.8 
1.8 
1.4 
1.3 
3.3 
2.6 
1.8 
1.5 
3.8 
2.0 
29 
34 
3.1 
2.6 
2.9 
--- 
5.2 
36 
4.5 
1.6 
1.4 
73 
1.7 
30 
21 
3.2 
2.5 
2.3 
1.8 
6.9 
3.4 
1.6 
2.7 
5.9 
1.6 
31 
57 
--- 
2.5 
11 
1.7 
--- 
26 
--- 
1.9 
2.5 
--- 
TOTAL 1123.3 
359.6 
112.4 
102.8 
51.0 
51.4 
96.6 
560.9 
142.5 
48.9 
144.6 
69.5 
MEAN 
36.2 
12.0 
3.63 
3.32 
1.82 
1.66 
3.22 
18.1 
4.75 
1.58 
4.66 
2.32 
MAX 
353 
72 
6.8 
11 
3.4 
5.8 
36 
146 
34 
3.0 
73 
12 
MIN 
4.9 
3.1 
2.5 
1.8 
1.3 
1.1 
1.2 
1.5 
1.6 
1.1 
1.0 
1.1 
CFSM 
9.68 
3.21 
.97 
.89 
.49 
.44 
.86 
4.84 
1.27 
.42 
1.25 
.62 
IN. 
11.17 
3.58 
1.12 
1.02 
.51 
.51 
.96 
5.58 
1.42 
.49 
1.44 
.69 
AC-FT 
2230 
713 
223 
204 
101 
102 
192 
1110 
283 
97 
287 
138 
CAL YR 1985 TOTAL 
3790.23 
MEAN 
10.4 
MAX 
400 
MIN 
.89 
CFSM 2.78 
IN. 
37.70 
AC-FT 
7520 
WTR YR 1986 TOTAL 
2863.5 
MEAN 
7.85 
MAX 
353 
MIN 
1.0 
CFSM 2.10 
IN. 
28.48 
AC-FT 
5680 
160 
  
 
 
 
 
  
 
  
 
 
 
RIO GRANDE DE LOIZA BASIN 
50051180 QUEBRADA SALVATIERRA NEAR SAN LORENZO, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS FEBRUARY 1984 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON- TEMPERA- 
STREAMFLOW, 
SPECIFIC CON- TEMPERA- 
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
DEC, 13 1446 
4.4 
378 
25.0 
161 
I
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162 
RIO GRANDE DE LOIZA BASIN 
50051310 RIO CAYAGUAS AT CERRO GORDO, PR 
LOCATION.--Lat 18'09'13', long 65'57'20", Hydrologic Unit 21010005, at downstream side on bridge on Highway 912. 
at Barrio Cerro Gordo, 2.8 i (4.5 km) south of San Lorenzo. 
DRAINAGE AREA.--10.2 i' (26.4 km'). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--October 1977 to current year. 
GAGE.--Water-stage recorder and crest-stage gage. Elevation Lt gage is 490 ft (150 ), from topographic map. 
Prior to Oct. 1, 1983, at site 2,000 ft (610 ) downstream at different datum. 
REMARKS.--Estimated daily discharges: Dec. 25 to Jan. 21, May 1-9, May 21-30, June 1-9, Aug. 17-29 and Sept. 24 
to Oct. 2. Records fair except those for estimated daily discharges, which are poor. 
AVERAGE DISCHARGE.--9 years (1978-86), 49.5 ft'/s (1.402 '/s), 65.90 in/yr (1,674 mm/yr), 35.860 acre-ft/yr 
(44.22 haP/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,200 ft'/s (374 m'/s), Aug. 31, 1979, gage height, 9.44 ft 
(2.877 ), site and datum then in use, fro rating curve extended above 1,000 ft 3/s 
m 3/s) on the basis 
of slope-area measurement; minimum discharge, 7.1 ft'/s (0.201 '/s), Feb. 4, May 3, 1981, Apr. 12, 13, 16, 
17, 1983 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2.500 ft'/s (70.8 '/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft'/s) 
(m 3/s) 
(ft) 
(m) 
Date 
Time 
(ft'/s) 
(60/s) 
(ft) 
(m) 
Oct. 6 
1045 
4.040 
114 
15.49 4.121 
May 14 
0145 
2,510 
71.1 
13.24 4.036 
Apr. 29 
1545 
4,110 
116 
15.59 4.752 
May 18 
1130 
*4,190 
119 
*15.69 4.782 
Minimum discharge, 11 ft'is (0.312 '/s), Apr. 25, 26. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
2 
3 
4 
5 
60 
67 
61 
70 
101 
98 
87 
83 
75 
77 
40 
41 
37 
31 
44 
30 
35 
40 
50 
35 
18 
17 
17 
28 
39 
15 
14 
16 
17 
20 
62 
26 
15 
19 
38 
25 
20 
25 
17 
24 
20 
28 
23 
21 
22 
30 
22 
22 
19 
19 
23 
20 
18 
18 
17 
24 
16 
14 
16 
41 
6 
7 
8 
9 
10 
1530 
664 
171 
76 
58 
65 
61 
59 
56 
56 
45 
39 
36 
37 
38 
27 
25 
30 
74 
60 
20 
18 
19 
18 
19 
19 
17 
15 
16 
16 
31 
16 
28 
58 
16 
38 
40 
48 
22 
254 
20 
18 
16 
28 
217 
65 
35 
23 
20 
19 
16 
33 
51 
20 
26 
19 
17 
15 
16 
14 
11 
12 
13 
14 
15 
45 
48 
49 
37 
30 
59 
84 
88 
68 
84 
35 
60 
42 
38 
40 
30 
22 
21 
25 
23 
21 
19 
16 
19 
18 
18 
17 
25 
27 
37 
13 
14 
16 
15 
15 
208 
65 
346 
495 
62 
21 
16 
29 
39 
52 
46 
37 
24 
26 
37 
61 
22 
42 
51 
25 
13 
13 
19 
24 
15 
16 
17 
18 
19 
20 
35 
55 
68 
51 
35 
72 
67 
141 
66 
64 
39 
33 
31 
34 
36 
27 
41 
27 
20 
19 
18 
21 
22 
63 
31 
16 
14 
14 
15 
16 
15 
15 
15 
15 
14 
38 
28 
591 
88 
37 
55 
40 
29 
35 
28 
27 
25 
25 
21 
22 
18 
17 
16 
15 
15 
17 
17 
18 
19 
18 
21 
22 
23 
24 
25 
38 
37 
360 
644 
173 
59 
48 
44 
42 
40 
33 
35 
46 
53 
35 
30 
24 
19 
23 
18 
20 
18 
17 
15 
15 
16 
15 
15 
15 
14 
15 
15 
14 
16 
13 
30 
60 
30 
26 
24 
23 
21 
19 
17 
16 
27 
20 
19 
20 
18 
14 
15 
16 
15 
14 
17 
23 
45 
70 
50 
26 
27 
28 
29 
30 
31 
120 
117 
105 
277 
124 
150 
41 
41 
39 
39 
44 
---
32 
30 
32 
31 
32 
28 
16 
15 
24 
20 
22 
20 
16 
19 
15 
---
20 
16 
13 
174 
51 
27 
13 
18 
45 
693 
81 
---
23 
24 
22 
60 
23 
273 
19 
25 
27 
20 
19 
---
18 
21 
24 
21 
63 
38 
13 
12 
80 
200 
59 
36 
30 
17 
15 
14 
13 
---
TOTAL 
MEAN 
MAX 
MIN 
CFSM 
IN. 
AC-FT 
5456 
176 
1530 
30 
17.3 
19.90 
10820 
1947 
64.9 
141 
39 
6.36 
7.10 
3860 
1163 
37.5 
60 
28 
3.68 
4.24 
2310 
892 
28.8 
74 
15 
2.82 
3.25 
1770 
596 
21.3 
63 
15 
2.09 
2.17 
1180 
740 
23.9 
174 
13 
2.34 
2.70 
1470 
1379 
46.0 
693 
13 
4.51 
5.03 
2740 
3066 
98.9 
591 
17 
9.70 
11.18 
6080 
963 
32.1 
217 
16 
3.15 
3.51 
1910 
853 
27.5 
65 
18 
2.70 
3.11 
1690 
998 
32.2 
200 
12 
3.16 
3.64 
1980 
659 
22.0 
70 
13 
2.16 
2.40 
1310 
CAL YR 1985 
WTR YR 1986 
TOTAL 
TOTAL 
22203 
18712 
MEAN 
MEAN 
60.8 
51.3 
MAX 
MAX 
1890 
1530 
M1N 
MIN 
15 
12 
CFSM 
CFSM 
5.96 
5.03 
IN. 
IN. 
80.98 
68.24 
AC-FT 
AC-FT 
44040 
37120 
 
 
 
  
 
   
  
    
   
   
163 
RIO GRANDE DE LOIZA BASIN 
50051310 RIO CAYAGUAS AT CERRO GORDO, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON- TEMPERA-
STREAMFLOW, 
SPECIFIC CON- TEMPERA-
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
DEC, 04 1301 
34 
128 
24.0 
SEP, 16 0955 
17 
141 
26.0 
AUG, 20 1010 
15 
140 
27.0 
I
I
I
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164 
RIO GRANDE DE LOIZA BASIN 
50053050 RIO TURABO AT BORINQUEN, PR 
LOCATION.--Lat 18°10'10", long 66°02'37", Hydrologic Unit 21010005, at right upstream end of bridge on Highway 765, 
0.5 mi (0.8 ka) south of Villa Borinquen, and 7.3 i (11.7 km) upstream from Rio Grande de Loiza. 
DRAINAGE AREA.--7.89 mi' (20.44 km:). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--December 1983 to current year. 
GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 430 ft (131 r), from topographic map. 
REMARKS.--Estimated daily discharges: Oct. 6, 7, Feb. 16 to Mar. 11, Mar. 16-24, May 2-6, May 21 to June 9, July 13, 
14 and Sept. 18-23. Records fair except those for estimated daily discharges, which are poor. 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 11,600 ft'is (328 '/s), May 18 1985, gage height, 17.06 ft 
(5.200 ), from floodmark, from rating curve extended above 200 ft'is (5.66 10/s) on basis of step-backwater 
analysis and slope-area measurement; minimum discharge, 4.0 ft'is (0.113 '/s), May 6. 1985. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft',/s (42.5 m'/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(W/s) 
(e/s) 
(ft) 
(m) 
Date 
Time 
(W/s) 
(e/s) 
(ft) 
(m) 
Oct. 6 
1600 
*6,160 
174 
*13.27 4.045 
May 13 
2345 
3,700 
105 
10.95 3.338 
May 
8 
1630 
2,920 
82.7 
10.11 3.082 
Aug 29 
0115 
1,700 
48.1 
8.47 2.582 
Minimum daily discharge. 6.0 ft'is (0.170 m'/s), Mar. 22, 23. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
61 
44 
21 
17 
14 
8.0 
11 
19 
25 
12 
15 
16 
2 
54 
39 
20 
17 
13 
8.0 
9.8 
13 
30 
11 
15 
15 
3 
54 
36 
20 
18 
25 
8.2 
15 
18 
23 
12 
16 
14 
4 
58 
33 
20 
21 
19 
9.0 
20 
13 
20 
10 
16 
13 
5 
70 
35 
22 
17 
17 
10 
20 
12 
23 
11 
15 
19 
6 
989 
31 
20 
15 
14 
8.4 
17 
11 
20 
31 
14 
13 
7 
338 
30 
20 
15 
14 
7.8 
13 
26 
19 
13 
17 
10 
8 
255 
29 
19 
15 
13 
7.4 
12 
157 
17 
10 
23 
8.4 
9 
134 
29 
19 
27 
13 
7.0 
9.8 
42 
20 
9.5 
17 
9.1 
10 
93 
28 
19 
17 
12 
8.0 
9.7 
50 
100 
8.3 
20 
8.5 
11 
73 
27 
19 
14 
12 
7.0 
9.3 
67 
20 
22 
44 
8.4 
12 
65 
59 
25 
14 
12 
6.9 
9.2 
31 
17 
15 
24 
9.9 
13 
61 
33 
19 
14 
11 
7.6 
8.8 
251 
30 
11 
79 
11 
14 
58 
45 
18 
13 
9.0 
8.2 
8.8 
151 
32 
16 
68 
9.4 
15 
57 
85 
18 
13 
8.2 
10 
11 
29 
29 
17 
40 
8.6 
16 
56 
51 
17 
12 
8.4 
6.4 
11 
18 
34 
14 
30 
7.9 
17 
58 
43 
17 
16 
8.8 
7.0 
10 
18 
23 
12 
22 
7.0 
18 
81 
73 
17 
14 
35 
6.6 
10 
120 
18 
12 
19 
6.8 
19 
59 
47 
17 
13 
25 
6.4 
11 
29 
26 
11 
14 
6.8 
20 
54 
42 
17 
13 
15 
6.4 
11 
16 
16 
14 
11 
6.6 
21 
53 
52 
17 
13 
10 
6.2 
11 
15 
14 
14 
9.7 
6.2 
22 
52 
34 
16 
11 
9.2 
6.0 
13 
60 
14 
8.4 
17 
6.6 
23 
152 
30 
16 
8.9 
8.8 
6.0 
11 
30 
13 
9.8 
14 
8.0 
24 
131 
27 
18 
12 
8,4 
7.0 
11 
26 
12 
12 
18 
57 
25 
85 
25 
18 
9.0 
9.0 
9.1 
11 
24 
11 
13 
10 
31 
26 
137 
24 
17 
8.5 
8.4 
9.6 
11 
23 
11 
9.0 
8.6 
16 
27 
82 
23 
16 
7.3 
8.6 
8.7 
13 
24 
12 
14 
6.8 
11 
28 
67 
21 
17 
7.6 
8.4 
8.8 
17 
22 
12 
17 
67 
9.5 
29 
95 
21 
16 
18 
---
26 
75 
56 
12 
12 
270 
8.3 
30 
60 
22 
15 
13 
13 
48 
22 
11 
14 
27 
9.2 
31 
60 
---
15 
16 
12 
---
90 
---
16 
20 
---
TOTAL 
3702 
1118 
565 
439.3 
369.2 
266.7 
458.4 
1483 
664 
411.0 
987.1 
371.2 
MEAN 
119 
37.3 
18.2 
14.2 
13.2 
8.60 
15.3 
47.8 
22.1 
13.3 
31.8 
12.4 
MAX 
989 
85 
25 
27 
35 
26 
75 
251 
100 
31 
270 
57 
MIN 
52 
21 
15 
7.3 
8.2 
6.0 
8.8 
11 
11 
8.3 
6.8 
6.2 
CFSM 
15.1 
4.73 
2.31 
1.80 
1.67 
1.09 
1.94 
6.06 
2.80 
1.69 
4.03 
1.57 
IN. 
17.45 
5.27 
2.66 
2.07 
1.74 
1.26 
2.16 
6.99 
3.13 
1.94 
4.65 
1.75 
AC-FT 
7340 
2220 
1120 
871 
732 
529 
909 
2940 
1320 
815 
1960 
736 
CAL YR 1985 TOTAL 
12044.8 
MEAN 
33.0 
MAX 
1300 
MIN 
4.8 
CFSM 4.18 
IN. 
56.79 
AC-FT 
23890 
WTR YR 1986 TOTAL 
10834.9 
MEAN 
29.7 
MAX 
989 
MIN 
6.0 
CFSM 3.76 
IN. 
51.08 
AC-FT 
21490 
 
 
 
  
 
   
  
   
165 
RIO GRANDE DE LOIZA BASIN 
50053050 RIO TURABO AT BORINQUEN, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS JANUARY 1985 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON- TEMPERA-
STREAMFLOW, 
SPECIFIC CON- TEMPERA-
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
DEC, 04 0955 
20 
153 
22.5 
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166 
RIO GRANDE DE LOIZA BASIN 
50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR 
LOCATION .--Lat 18°14'33', long 66°00'34", Hydrologic Unit 21010005, on right bank 250 ft (16 ) upstream from 
bridge on Highway 189, 1.2 mi (1.9 km) downstream from Rio Turabo, and 1.8 i (2.9 km) east of Plaza de Caguas. 
DRAINAGE AREA.--89.8 mil (232.6 km 2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--1959 (low-flow measurement only), February to November 1959 (monhly measurements only), 
December 1959 to current year. 
GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 143.28 ft (43.672 m) above mean sea level. 
REMARKS.--Estimated daily discharges: Jan. 7-12. Records fair except those for paints of estimated daily discharges, 
which are poor. 
AVERAGE DISCHARGES.--26 years (1961-86), 224 ftys (6.344 m'/s), 33.81 in/yr (860 mm/yr), 162,300 acre-ft/yr 
(200 hm'/yr); median of yearly mean discharges, 215 ft'is (6.09 '/s), 156,000 acre-ft/yr (192 hm0/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 71,500 ft'is (2,020 '/s), Sept. 6, 1960, gage height, 
31.17 ft (9.501 ), from rating curve extended above 6,000 ft'/s (170 '/s) on basis of slope-area 
measurement; minimum daily discharge, 10 ft'/s (0.283 m'/s), Apr. 5, 10, 29, 1968. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 8,000 ft'is (227 le/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft'/s) 
(41 3/s) 
(ft) (m) 
Date 
Time 
(ft'/s) 
(m)/s) 
(ft) 
(m) 
Oct. 6 
2400 
*22,800 
646 
*19.80 6.035 
May 13 
0945 
16,700 
473 
16.75 5.105 
Apr. 29 
1715 
9,900 
280 
13.90 4.237 
May 18 
1330 
8,480 
240 
13.17 4.014 
May 
8 
1730 
14,520 
411 
15.91 4.849 
Minimum discharge, 27 ft'is (0.765 m3/s), Apr. 25, 26. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
329 
456 
185 
117 
101 
61 
142 
278 
222 
103 
76 
165 
2 
411 
376 
176 
147 
78 
54 
97 
144 
177 
103 
83 
247 
3 
379 
334 
172 
128 
98 
51 
110 
102 
203 
103 
67 
117 
4 
461 
308 
164 
156 
143 
53 
238 
98 
160 
93 
66 
101 
5 
749 
314 
202 
140 
182 
65 
226 
95 
132 
88 
65 
143 
6 
8560 
285 
198 
115 
100 
64 
198 
160 
118 
179 
54 
109 
7 
7600 
258 
180 
105 
83 
57 
98 
545 
115 
129 
61 
99 
8 
2190 
244 
161 
200 
79 
48 
162 
1980 
135 
98 
146 
83 
9 
908 
238 
164 
450 
80 
51 
193 
630 
363 
85 
68 
78 
10 
672 
226 
165 
190 
68 
51 
83 
1060 
946 
80 
62 
75 
11 
530 
221 
167 
150 
67 
57 
61 
1310 
203 
118 
218 
65 
12 
447 
335 
193 
120 
71 
64 
52 
308 
160 
155 
113 
61 
13 
396 
447 
180 
110 
72 
69 
48 
2870 
249 
100 
131 
64 
14 
363 
457 
157 
100 
61 
84 
44 
1320 
280 
100 
241 
84 
15 
338 
1630 
153 
100 
66 
195 
51 
457 
179 
121 
115 
55 
16 
323 
581 
146 
96 
60 
100 
87 
292 
245 
121 
82 
46 
17 
398 
352 
135 
156 
60-
64 
57 
238 
194 
95 
63 
41 
18 
675 
1270 
138 
140 
77 
54 
37 
1940 
168 
89 
55 
34 
19 
455 
391 
147 
104 
105 
48 
33 
482 
222 
81 
52 
29 
20 
319 
358 
153 
87 
113 
46 
93 
296 
114 
77 
46 
29 
21 
297 
893 
136 
105 
76 
44 
62 
266 
147 
90 
43 
31 
22 
289 
310 
133 
102 
65 
39 
39 
289 
132 
75 
46 
37 
23 
2020 
273 
130 
89 
70 
36 
42 
206 
126 
67 
115 
61 
24 
2760 
253 
140 
109 
58 
37 
33 
180 
126 
65 
94 
549 
25 
1060 
234 
130 
122 
58 
35 
32 
160 
103 
69 
81 
350 
26 
1450 
223 
132 
88 
58 
61 
28 
150 
103 
66 
58 
211 
27 
807 
215 
117 
78 
58 
57 
39 
138 
126 
55 
49 
130 
28 
512 
204 
118 
76 
59 
40 
124 
132 
121 
76 
136 
89 
29 
1260 
197 
113 
94 
---
480 
1830 
180 
108 
66 
2940 
63 
30 
552 
194 
111 
102 
180 
460 
163 
100 
99 
316 
54 
31 
944 
---
105 
95 
108 
---
1040 
---
136 
215 
---
TOTAL 
38454 
12077 
4701 
3971 
2266 
2453 
4799 
17509 
5841 
2992 
5957 
3300 
MEAN 
1240 
403 
152 
128 
80.9 
79.1 
160 
565 
195 
96.5 
192 
110 
MAX 
8560 
1630 
202 
450 
182 
480 
1830 
2870 
946 
179 
2940 
549 
MIN 
289 
194 
105 
76 
58 
35 
28 
95 
100 
65 
43 
29 
CFSM 
13.8 
4.49 
1.69 
1.43 
.90 
.88 
1.78 
6.29 
2.17 
1.07 
2.14 
1.22 
IN. 
15.93 
5.00 
1.95 
1.65 
.94 
1.02 
1.99 
7.25 
2.42 
1.24 
2.47 
1.37 
AC-FT 
76270 
23950 
9320 
7880 
4490 
4870 
9520 
34730 
11590 
5930 
11820 
6550 
CAL YR 1985 TOTAL 123626 
MEAN 
339 
MAX 
10400 
MIN 
23 
CFSM 3.78 
IN. 
51.21 
AC-FT 245200 
WTR YR 1986 TOTAL 104320 
MEAN 
286 
MAX 
8560 
MIN 
28 
CFSM 3.18 
IN. 
43.21 
AC-FT 206900 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
 
 
 
 
 
  
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO GRANDE DE LOIZA BASIN 
50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1959 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) (DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
29... 
1335 
2310 
111 
6.70 
28.0 
850 
7.8 
99 
69 
54000 
43000 
DEC 
11... 
1500 
E250 
250 
7.90 
26.0 
40 
7.8 
96 
<10 K150000 
340 
FEB 1986 
03... 
1150 
92 
263 
8.00 
23.5 
15 
7.9 
93 
23 
K9500 
K1500 
APR 
16... 
1300 
63 
218 
7.70 
28.0 
15 
7.5 
97 
28 
25000 
K170 
JUL 
15... 
1055 
113 
211 
7.65 
28.5 
27 
7.6 
99 
18 
K16000 
440 
SEP 
09... 
1120 
76 
241 
7.65 
30.0 
21 
7.6 
101 
<10 
20000 
200 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- 
NONCARB CALCIUM 
SIUM, SODIUM, 
AD- 
SLUM, WH WAT 
SULFATE 
RIDE, 
NESS 
WH WAT 
DIS- 
DIS- 
DIS- 
SORP- 
DIS- 
TOTAL 
SULFIDE 
DIS- 
DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
29... 
29 
0 
6.5 
3.0 
8.0 
0.7 
1.0 
29 
<0.5 
7.3 
7.5 
DEC 
11... 
64 
FEB 1986 
03... 
78 
APR 
16... 
77 
0 
18 
7.8 
23 
1 
2.4 
80 
<0.5 
15 
23 
JUL 
15... 
-- 
68 
SEP 
09... 
71 
0 
17 
7.0 
21 
1 
2.2 
76 
14 
16 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
0.1G/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
5102) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
29... 
<0.10 
18 
69 
439 
708 
0.270 
0.130 
0.400 
0.260 
1.6 
DEC 
11... 
62 
0.370 
0.030 
0.400 
0.070 
0.33 
FEB 1986 
03... 
34 
0.450 
0.050 
0.500 
0.140 
0.46 
APR 
16... 
0.10 
32 
170 
29 
22 
0.600 
0.100 
0.700 
0.410 
0.59 
JUL 
15... 
18 
0.260 
0.040 
0.300 
0.130 
0.37 
SEP 
09... 
0.20 
35 
160 
32 
22 
0.330 
0.070 
0.400 
0.140 
0.36 
E = estimate 
K = non-ideal count 
167 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
RIO GRANDE DE LOIZA BASIN 
50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM M1UM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
29... 
1.9 
2.3 
10 
0.370 
1 
200 
50 
1 
14 
50 
DEC 
11... 
0.40 
0.80 
3.5 
0.090 
FEB 1986 
03... 
0.60 
1.1 
4.9 
0.210 
APR 
16... 
1.0 
1.7 
7.5 
0.310 
<1 
<100 
10 
<1 
1 
30 
JUL 
15... 
0.50 
0.80 
3.5 
0.140 
SEP 
09... 
0.50 
0.90 
4.0 
0.200 
MALAGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
29... 
19000 
17 
740 
0.10 
<1 
<1 
70 
<0.010 
<1 
0.04 
DEC 
11... 
FEB 1986 
03... 
APR 
16... 
940 
1 
260 
0.10 
<1 
<1 
20 
<0.010 
3 
0.15 
JUL 
15... 
SEP 
09... 
168 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
  
 
 
  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
  
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
 
 
 
 
 
  
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO GRANDE DE LOIZA BASIN 
50055250 RIO CAGUITAS AT HIGHWAY 30 AT CAGUAS, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°15'11", long 66°01'26", at Highway 30 bridge, and 0.8 mi (1.3 km) east of Caguas plaza. 
DRAINAGE AREA.--14.1 sq mi (36.5 sq km). 
PERIOD OF RECORD.--Water years 1972 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARO 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
16... 
1645 
28 
540 
7.10 
30.0 
6.7 
5.2 
47 
70000 
5400 
DEC 
16... 
1355 
38 
750 
7.10 
25.0 
3.5 
5.2 
120 
23000 
K1000 
FEB 1986 
18... 
1315 
21 
660 
7.60 
26.5 
10 
4.4 
80 
<1000 
<1000 
APR 
22... 
1305 
22 
592 
7.60 
29.5 
8.0 
4.8 
64 
76 
46000 
<1000 
JUL 
15... 
1340 
61 
386 
7.45 
30.5 40 
3.6 
48 
55 2000000 K110000 
SEP 
15... 
1325 
24 
616 
7.65 
31.0 
9.0 
4.3 
58 
75 K1330000 K110000 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- 
NONCARB CALCIUM 
SIUM, SODIUM, 
AD- 
SLUM, WH WAT 
SULFATE 
RIDE, 
NESS 
WH WAT 
DIS- 
DIS- 
DIS- 
SORP- 
DIS- 
TOTAL 
SULFIDE 
DIS- 
DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
16... 
150 
19 
40 
13 
38 
1 
4.6 
134 
<0.5 
45 
40 
DEC 
16... 
164 
FEB 1986 
18... 
156 
APR 
22... 
150 
8 
40 
12 
40 
1 
6.5 
141 
<0.5 
52 
43 
JUL 
15... 
121 
SEP 
15... 
150 
0 
39 
12 
51 
2 
6.9 
164 
59 
55 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
16... 
0.30 
27 
290 
22 
10 
0.600 
0.100 
0.700 
6.00 
2.1 
DEC 
16... 
10 
0.490 
0.210 
0.700 
15.0 
2.0 
FEB 1986 
18... 
20 
0.590 
0.310 
0.900 
10.0 
3.0 
APR 
22... 
0.30 
29 
310 
18 
22 
0.890 
0.210 
1.10 
9.20 
JUL 
15... 
16 
0.440 
0.160 
0.600 
5.70 
4.1 
SEP 
15... 
0.90 
29 
350 
23 
13 
1.25 
0.250 
1.50 
10.0 
7.0 
K = non-ideal count 
169 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO GRANDE DE LOIZA BASIN 
50055250 RIO CAGUITAS AT HIGHWAY 30 AT CAGUAS, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA NITRO- NITRO- PROS- 
TOTAL TOTAL TOTAL TOTAL TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABL: ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
16... 
8.1 
8.8 
39 
1.80 
1 
<100 
90 
4 
5 
DEC 
16... 
17 
18 
78 
2.70 
-- 
FEB 1986 
18... 
13 
14 
62 
3.00 
-- 
APR 
22... 
2.50 
2 
<100 
90 
2 
19 
70 
JUL 
15... 
9.8 
10 
46 
1.70 
SEP 
15... 
17 
18 
82 
3.80 
MANGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
16... 
1200 
4 
260 
-0.10 
<1 
2 
90 
0.010 
9 
1.2 
DEC 
16... 
FEB 1986 
18... 
- 
APR 
22... 
800 
4 
280 
0.30 
<1 
1 
70 
0.030 
5 
0.72 
JUL 
15... 
- 
SEP 
15... 
- 
170 
 
 
         
 
    
 
      
  
  
          
        
 
 
 
   
           
           
 
 
 
 
   
    
 
         
           
         
           
 
 
           
 
          
 
  
     
         
 
 
          
         
          
 
     
 
     
          
 
     
          
171 
RIO GRANDE DE LOIZA BASIN 
50055400 RIO BAIROA NEAR CAGUAS, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°15'28", long 66°02'13", at bridge on Highway 1, about 2.5 mi (4.0 km) upstream from Rio Grande 
de Loiza, and 1.4 mi (2.3 km) north of Caguas plaza. 
DRAINAGE AREA.--5.4 sq mi (14.0 sq km). 
PERIOD OF RECORD.--Water years 1958, 1962-66, 1913-74, 1979 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- D1S- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
1TY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
16... 
1345 11 
401 7.70 30.0 2.5 
0.5 
38 310000 68000 
DEC 
16... 
1130 
8.6 
395 
8.00 
23.0 
4.1 
7.8 
<10 
28000 
3000 
FEB 1986 
18... 
1115 
7.2 
458 
7.40 
23.5 
10 
0 
99 K2000000 
130000 
APR 
21... 
1220 5.6 
348 1.80 25.5 39 
8.0 
99 
29 40000 450000 
JUL 
16... 
0910 
5.1 
377 
7.65 
25.5 
12 
8.4 
104 
<10 
K9700 
K1800 
SEP 
10... 
0900 
4.5 
412 
7.90 
26.0 
1.5 
8.2 
102 
15 
2400 
2700 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD-
SLUM, WATER 
SULFATE RIDE, 
NESS 
WATER DIS-
DIS- DIS-
SORP-
DIS- TOTAL SULFIDE DIS-
DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS 5) 
AS SO4) 
AS CL) 
OCT 1985 
16... 
140 
0 
34 
14 
24 
0.9 
4.6 
156 
<0.5 
23 
34 
DEC 
16... 
121 
FEB 1986 
18... 
141 
APR 
21... 
120 
16 
28 
12 
18 
0.7 
4.3 
103 
<0.5 
16 
23 
JUL 
16... 
121 
SEP 
10... 
150 
13 
35 
14 
24 
0.9 
4.2 
132 
19 
37 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
S102) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
16... 
0.20 
29 
260 
7.6 
3 
1.29 
0.110 
1.40 
1.20 
1.0 
DEC 
16... 
2 
1.78 
0.020 
1.80 
0.060 
0.34 
FEB 1986 
18... 
12 
1.25 
0.050 
1.30 
3.80 
3.4 
APR 
21... 
0.20 
23 
190 
2.8 
52 
1.33 
0.070 
1.40 
0.150 
0.45 
JUL 
16... 
17 
0.980 
0.020 
1.00 
0.100 
0.50 
SEP 
10... 
0.20 
27 
240 
2.9 
6 
1.19 
0.010 
1.20 
0.080 
0.32 
K = non-ideal count 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
RIO GRANDE DE LOIZA BASIN 
50055400 RIO BAIROA NEAR CAGUAS, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
16... 
2.2 
3.6 
16 
1.20 
2 
100 
50 
1 
27 
10 
DEC 
16... 
0.40 
2.2 
9.7 
0.300 
FEB 1986 
18... 
7.2 
8.5 
38 
3.10 
APR 
21... 
0.60 
2.0 
8.9 
0.260 
2 
100 
20 
<1 
24 
10 
JUL 
16... 
0.60 
1.6 
7.1 
0.450 
SEP 
10... 
0.40 
1.6 
7.1 
0.290 
MANGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
16... 
2600 
26 
230 
<0.10 
<1 
<1 
30 
<0.010 
7 
1.1 
DEC 
16... 
FEB 1986 
18... 
APR 
21... 
1700 
3 
150 
<0.10 
<1 
<1 
20 
<0.010 
<1 
0.07 
JUL 
16... 
SEP 
10... 
172 
I
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
173 
RIO GRANDE DE LOIZA BASIN 
50055650 QUEBRADA CAIMITO NEAR JUNCOS, PR 
LOCATION.--Lat 18°14'08", long 65°52'12", Hydrologic Unit 21010005, at upstream side of bridge on Highway 31, 
0.5 mi (0.8 km) upstream from Rio Gurabo, and 3.5 i (5.6 km) east of Juncos. 
DRAINAGE AREA.--0.82 mil (2.12 km 2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--January 1984 to current year. 
GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 310 ft (95 m), from topographic map. 
REMARKS.--Estimated daily discharges: Oct. 13-16, Apr. 15 to May 8 and June 29 to July 15. Records poor. 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 992 ft'is (28.1 m'/s), Oct. 6, 1985, gage height, 13.37 ft 
(4.075 m), from fl)odmark, from rating curve extended above 100 ftYs (2.83 110/s) on basis of step-backwater 
analysis; minictim discharge, no flow many days in each year. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 150 ft'/s (4.25 10/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(W/s) 
(leis) 
(ft) (m) 
Date 
Time 
(ft'/s) 
(10/s) 
(ft) 
(m) 
Oct. 6 
1745 
*992 
28.1 
*13.37 4.075 
May 13 
0815 
339 
9.60 
10.53 3.210 
Oct. 7 
0300 
254 
7.19 
10.13 3.088 
Aug. 28 
2400 
331 
9.37 
10.49 3.197 
Oct. 18 
1445 
170 
4.81 
9.69 2.954 
Aug. 29 
0200 
240 
6.80 
10.06 3.066 
May 
9 
1630 
414 
11.7 
10.87 3.313 
No flow many days. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
3.6 
3.3 
.51 
.37 
.19 
.13 
.17 
.09 
2.4 
.00 
.15 
2.9 
2 
21 
2.5 
.46 
.35 
.24 
.12 
.13 
.06 
1.6 
.01 
.05 
1.9 
3 
4.3 
1.9 
.40 
.31 
.48 
.12 
.11 
.05 
1.1 
.02 
.04 
1.1 
4 
8.0 
1.5 
.37 
.36 
.70 
.14 
.17 
.03 
.55 
.01 
.02 
.75 
5 
7.3 
1.3 
.61 
.30 
.32 
.12 
1.6 
.03 
.45 
.00 
.00 
.58 
6 
136 
1.1 
.51 
.27 
.19 
.14 
.53 
.04 
.27 
.50 
.00 
1.5 
7 
71 
.99 
.36 
.27 
.18 
.13 
.17 
.38 
.25 
.13 
.01 
.67 
8 
14 
.80 
.30 
.27 
.19 
.11 
.15 
.35 
.20 
.04 
.01 
.28 
9 
5.8 
.76 
.28 
1.4 
.18 
.12 
.14 
11 
1.2 
.02 
.00 
.15 
10 
3.3 
.68 
.24 
.43 
.18 
.12 
.10 
5.8 
.25 
.00 
.00 
.11 
11 
2.3 
.82 
.22 
.27 
.21 
.16 
.09 
6.7 
.15 
.01 
.34 
.09 
12 
1.7 
2.4 
.22 
.24 
.20 
.13 
.09 
2.4 
.12 
.04 
.03 
.07 
13 
1.0 
4.4 
.22 
.25 
.18 
.17 
.08 
32 
.12 
.01 
.01 
.71 
14 
.70 
1.6 
.23 
.24 
.16 
.32 
.07 
23 
.14 
.02 
.03 
.25 
15 
.50 
30 
.29 
.20 
.12 
.41 
.06 
4.6 
.14 
.11 
.00 
.07 
16 
.35 
11 
.24 
.24 
.12 
.09 
.05 
1.7 
.19 
.03 
.30 
.04 
17 
.33 
3.7 
.26 
.27 
.14 
.08 
.05 
.70 
.15 
.01 
.02 
.00 
18 
11 
3.7 
.26 
.25 
.12 
.08 
.04 
1.0 
.12 
.00 
.01 
.00 
19 
3.5 
2.1 
.27 
.24 
.12 
.08 
.03 
.51 
.11 
.00 
.00 
.00 
20 
1.6 
1.4 
.23 
.22 
.13 
.09 
.04 
.27 
.09 
.00 
.00 
.00 
21 
.94 
2.2 
.22 
.25 
.10 
.08 
.04 
.27 
.07 
.00 
.00 
.00 
22 
.65 
1.1 
.24 
.23 
.12 
.07 
.03 
.25 
.06 
.00 
.00 
.00 
23 
8.3 
.91 
.22 
.28 
.13 
.09 
.03 
.18 
.05 
.00 
.00 
.05 
24 
23 
1.0 
.22 
.39 
.14 
.09 
.03 
.14 
.04 
.00 
.00 
.02 
25 
13 
.75 
.35 
.30 
.17 
.12 
.02 
.11 
.03 
.00 
.00 
.03 
26 
5.3 
.64 
.26 
.26 
.15 
.14 
.02 
.11 
.03 
.00 
.00 
.01 
27 
3.4 
.63 
.22 
.24 
.13 
.13 
.10 
.10 
.08 
.00 
.00 
.00 
28 
2.8 
.51 
.25 
.22 
.13 
.10 
.20 
.09 
.03 
.00 
7.4 
.00 
29 
7.0 
.51 
.30 
.21 
---
.59 
3.0 
.09 
.02 
.11 
28 
.00 
30 
4.2 
.52 
.31 
.25 
.14 
1.0 
.09 
.01 
5.0 
4.8 
.00 
31 
4.4 
---
.31 
.21 
.21 
---
6.1 
---
1.1 
5.0 
---
TOTAL 370.27 
84.69 
9.38 
9.59 
5.42 
4.62 
8.34 
98.24 
10.02 
7.17 
46.22 
11.28 
MEAN 
11.9 
2.82 
.30 
.31 
.19 
.15 
.28 
3.17 
.33 
.23 
1.49 
.38 
MAX 
136 
30 
.61 
1.4 
.70 
.59 
3.0 
32 
2.4 
5.0 
28 
2.9 
MIN 
.33 
.51 
.22 
.20 
.10 
.07 
.02 
.03 
.01 
.00 
.00 
.00 
CFSM 
14.5 
3.44 
.37 
.38 
.23 
.18 
.34 
3.87 
.40 
.28 
1.82 
.46 
IN. 
16.80 
3.84 
.43 
.44 
.25 
.21 
.38 
4.46 
.45 
.33 
2.10 
.51 
AC-FT 
734 
168 
19 
19 
11 
9.2 
17 
195 
20 
14 
92 
22 
CAL YR 1985 TOTAL 839.00 
MEAN 
2.22 
MAX 
136 
MIN 
.00 
CFSM 2.71 
IN. 
36.70 
AC-FT 
1600 
WTR YR 1986 TOTAL 665.24 
MEAN 
1.82 
MAX 
136 
MIN 
.00 
CFSM 2.22 
IN. 
30.18 
AC-FT 
1320 
 
 
 
  
 
 
  
 
 
    
   
174 
RIO GRANDE DE LOIZA BASIN 
50055650 QUEBRADA CAIMITO NR JUNCOS, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS JUNE 1984 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON- TEMPERA-
STPEAMFLOW, 
SPECIFIC CON- TEMPERA-
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
DEC, 05 1232 
1.5 
342 
25.5 
SEP, 15 1235 
0.07 
351 
32.0 
 
I 
I
  
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
175 
RIO GRANDE DE LOIZA BASIN 
50056400 RIO VALENCIANO NEAR JUNCOS. PR 
LOCATION.--Lat 18°12'58", long 65°55'34", Hydrologic Unit 21010005, on left bank at Highway 919, 0.5 mi (0.8 km) 
upstream fro Quebrada Don Victor, 1.7 mi (2.7 km) upstream from Rio Gurabo and 1.0 mi (1.6 km) south of Juncos. 
DRAINAGE AREA.--16.4 i' (42.5 km'). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--January 1971 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 320 ft (98 m), from topographic map. 
REMARKS.--Estimated daily discharges: Mar. 7-12. Records fair except those for estimated daily discharges, 
which are poor. 
AVERAGE DISCHARGE.--15 years (1972-86), 51.3 ft'is (1.453 re/s), 42.48 in/yr (1,079 mm/yr), 37,170 acre-ft/yr 
(45.8 hm'/yr); median of yearly mean discharges, 52 ft'/s (1.47 m'/s), 37,700 acre-ft/yr (46 he/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 25,700 ft3/s (728 m'/s), May 18, 1985, gage height, 21.30 ft 
(6.492 m), from rating curve extended above 100 ft'is (2.83 m'/s) on basis of slope-area measurement and 
step-backwater analysis; minimum discharge, 2.0 ft'is (0.057 10/s), May 11, 1984. 
EXTREMES OUTSIDE PERICD OF RECORD.--Approximate discharges (no stages were recorded) of major floods are as follows: 
Sept. 6, 1960, 37,100 ft'/s (1,050 le/s); Oct. 9, 1970, 18,200 ft'/s (515 10/s). 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,400 ft'is (96.3 m'/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time (ft)/s) (60/s) (ft) (m) 
Date Time (ft'/s) (m/s) (ft) (m) 
Oct. 6 
1130 
*7,460 
211 
*11.32 3.450 
May 13 
0830 
4.280 
121 
8.49 2.588 
Oct. 7 
2330 
3,800 
108 
8.05 2.454 
May 14 
0100 
5,490 
155 
9.65 2.941 
Oct. 24 
1745 
5,690 
161 
9.84 2.999 
Minimum discharge. 6.3 ft'is (0.178 o'/s), Apr. 25. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
46 
90 
29 
24 
13 
8.8 
64 
22 
42 
25 
20 
22 
2 
79 
79 
31 
27 
13 
9.0 
17 
16 
57 
21 
18 
19 
3 
79 
63 
29 
22 
12 
9.1 
13 
14 
53 
22 
13 
16 
4 
77 
58 
27 
22 
15 
9.3 
29 
16 
35 
20 
14 
15 
5 
180 
64 
41 
20 
15 
11 
28 
12 
32 
19 
12 
15 
6 
2920 
55 
38 
18 
12 
11 
23 
20 
27 
40 
12 
16 
7 
1420 
50 
30 
18 
11 
9.0 
14 
88 
54 
30 
18 
15 
8 
428 
4E 
26 
17 
11 
8.6 
23 
69 
107 
20 
42 
13 
9 
136 
42 
25 
35 
11 
9.0 
46 
49 
141 
19 
19 
12 
10 
95 
40 
26 
27 
11 
8.8 
14 
308 
204 
17 
20 
12 
11 
76 
44 
25 
20 
12 
9.4 
11 
215 
51 
19 
33 
11 
12 
66 
56 
34 
18 
12 
8.8 
11 
53 
42 
20 
17 
11 
13 
59 
51 
25 
17 
11 
11 
10 
851 
79 
17 
50 
12 
14 
53 
51 
23 
16 
10 
13 
9 5 
831 
68 
24 
49 
18 
15 
50 
385 
24 
16 
10 
38 
9 3 
89 
46 
24 
25 
12 
16 
51 
130 
23 
17 
10 
13 
9.5 
61 
54 
19 
18 
11 
17 
72 
74 
22 
61 
12 
11 
9.1 
54 
34 
18 
16 
11 
18 
201 
200 
24 
24 
16 
8.2 
9.0 
417 
33 
18 
14 
9.5 
19 
80 
63 
23 
19 
12 
8.2 
8.6 
127 
49 
16 
14 
9.7 
20 
56 
5' 
26 
17 
12 
8.2 
8.4 
69 
31 
16 
13 
9.5 
21 
55 
50 
22 
18 
11 
8.3 
8.3 
66 
28 
16 
12 
9.0 
22 
47 
41 
22 
16 
11 
8.8 
7.8 
63 
26 
15 
11 
11 
23 
453 
40 
22 
15 
9 9 
8.5 
7.4 
42 
25 
20 
11 
12 
24 
1050 
37 
25 
17 
9 7 
7.4 
7.9 
36 
24 
18 
11 
33 
25 
208 
34 
21 
16 
11 
8.3 
7.1 
32 
22 
15 
11 
26 
26 
150 
31 
23 
16 
11 
17 
7.1 
29 
23 
14 
9 8 
16 
27 
104 
31 
21 
14 
9.6 
8.8 
10 
29 
26 
16 
9 5 
13 
28 
77 
30 
21 
14 
9.0 
9.8 
21 
26 
23 
17 
27 
15 
29 
478 
30 
19 
13 
---
93 
365 
25 
21 
14 
386 
12 
30 
112 
30 
18 
14 
18 
60 
23 
21 
23 
29 
11 
31 
160 
---
19 
13 
35 
---
114 
---
24 
20 
---
TOTAL 
9118 
2048 
784 
621 
323.2 
445.3 
868.0 
3866 
1478 
616 
974.3 
427.7 
MEAN 
294 
68.3 
25.3 
20.0 
11.5 
14.4 
28.9 
125 
49.3 
19.9 
31.4 
14.3 
MAX 
2920 
385 
41 
61 
16 
93 
365 
851 
204 
40 
386 
33 
MIN 
46 
30 
18 
13 
9.0 
7.4 
7.1 
12 
21 
14 
9.5 
9.0 
CFSM 
17.9 
4.16 
1.54 
1.22 
.70 
.88 
1.76 
7.62 
3.01 
1.21 
1.91 
.87 
IN. 
20.68 
4.65 
1.78 
1.41 
.73 
1.01 
1.97 
8.77 
3.35 
1.40 
2.21 
.97 
AC-FT 
18090 
4060 
1560 
1230 
641 
883 
1720 
7670 
2930 
1220 
1930 
848 
CAL YR 1985 TOTAL 
27815.2 
MEAN 
76.2 
MAX 
3910 
MIN 
9.1 
CFSM 4.65 
IN. 
63.09 
AC-FT 
55170 
WTR YR 1986 TOTAL 
21569.5 
MEAN 
59.1 
MAX 
2920 
MIN 
7.1 
CFSM 3.60 
IN. 
48.93 
AC-FT 
42780 
  
 
 
 
 
  
 
  
 
 
 
  
 
 
 
 
 
RIO GRANDE DE LOIZA BASIN 
50056400 RIO VALENCIANO NEAR JUNCOS, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON- TEMPERA- 
STREAMFLOW, 
SPECIFIC CON- TEMPERA- 
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
DEC, 05 1018 
34 
274 
22.5 
SEP, 15 1030 
12 
253 
28.0 
MAR, 12 0950 
10 
280 
24.0 
176 
I
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
177 
RIO GRANDE DE LOIZA BASIN 
50056900 QUEBRADA MAMEY NEAR GURABO, PR 
LOCATION.--Lat 18°14'57", long 65°56'44", Hydrologic Unit 21010005, at left downstream side of bridge on 
Highway 189, 1.9 mi (3.0 km) southeast of Gurabo plaza, and 2.1 mi (3.4 km) northwest of Juncos plaza. 
DRAINAGE AREA.--2.30 mi' (5.96 km 2 ). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--December 1983 to current year. 
GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 180 ft (55 m), from topographic map. 
REMARKS.--Estimated daily dicharges: Feb. 27 to Mar. 3. Records fair except those for estimated daily discharges, 
which are poor. 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,690 ft'/s (47.9 m'/s), May 15, 1985, gage height, 9.42 ft 
(2.871 m), from floodmark, from rating curve extended above 400 fti/s (11.3 m3 /s) on basis of indirect 
measurement of peak flow and step-backwater analysis; minimum discharge, 0.24 ft'/s (0.007 
'/s), Aug. 30, 1984. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft'is (14.2 m'/s) and maximum ( * ) 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time (ft'/s) 
(e/s) 
(ft) (m) 
Date Time (W/s) 
(fe/s) 
(ft) (m) 
Oct. 
7 
0015 
841 
23.8 
7.66 2.335 
May 
13 
0830 
*1,070 
30.3 
*8.16 2.487 
Nov. 15 
0945 
528 
15.0 
6.84 2.085 
May 
14 
0015 
985 
27.9 
7.97 
2.429 
May 
9 
1600 
506 
14.3 
6.77 
2.063 
Minimum discharge, 0.46 ft'/s (0.013 m'/s), Sept. 20, 21, 30. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
2.8 
4.3 
2.3 
1.4 
1.1 
.88 
1.1 
2.2 
.96 
.75 
.67 
1.6 
2 
9.8 
3.4 
2.2 
1.6 
1.1 
.85 
.73 
1.7 
2.8 
.75 
.64 
.91 
3 
2.3 
3.1 
2.0 
1.4 
1.1 
.77 
.71 
1.5 
1.2 
.72 
.64 
.79 
4 
17 
3.0 
2.0 
1.5 
5.9 
.79 
1.0 
1.4 
.92 
.69 
.64 
.69 
5 
17 
3.0 
2.2 
1.5 
1.9 
.80 
2.1 
1.4 
3.5 
.70 
.59 
.68 
6 
251 
2.8 
2.2 
1.5 
1.2 
.80 
1.4 
1.4 
.99 
1.1 
.57 
.74 
7 
189 
2.7 
2.3 
1.5 
1.1 
.79 
.83 
2.8 
.91 
.87 
.62 
.66 
8 
54 
2.5 
2.3 
1.5 
1.1 
.75 
27 
17 
.87 
.79 
1.1 
.62 
9 
8.6 
2.6 
2.5 
2.0 
1.1 
.72 
3.5 
41 
4.3 
.78 
.75 
.62 
10 
5.2 
2.5 
2.5 
1.8 
1.1 
.72 
1.2 
21 
1.3 
.76 
.77 
.60 
11 
4.1 
2.6 
2.5 
1.6 
1.1 
.76 
1.1 
18 
.96 
.79 
2.0 
.57 
12 
3.6 
3.2 
2.4 
1.5 
1.1 
.74 
.89 
2.9 
.91 
.82 
.84 
.56 
13 
3.4 
4.6 
2.2 
1.5 
1.0 
.74 
.84 
173 
1.3 
.80 
.74 
.56 
14 
3.2 
3.4 
2.1 
1.4 
1.0 
.82 
.80 
87 
1.5 
.72 
.84 
.56 
15 
3.2 
87 
2.2 
1.3 
1.0 
1.8 
.84 
2.4 
.93 
.75 
1.1 
.59 
16 
3.2 
12 
1.9 
1.4 
1.0 
.81 
.89 
1.4 
.95 
.77 
.91 
.55 
17 
3.1 
7.6 
2.0 
1.4 
1.0 
.75 
.82 
1.1 
.87 
.69 
.75 
.53 
18 
14 
31 
1.9 
1.3 
1.0 
.73 
.76 
2.8 
.84 
.64 
.75 
.51 
19 
5.2 
5.2 
1.9 
1.3 
1.0 
.73 
.73 
5.4 
.81 
.61 
.73 
.50 
20 
3.4 
4.7 
1.8 
1.2 
.99 
.73 
7.4 
1.3 
.80 
.59 
.70 
.49 
21 
3.2 
34 
1.8 
1.2 
.95 
.72 
1.6 
1.0 
.79 
.59 
.70 
.49 
22 
3.1 
4.5 
1.7 
1.3 
.94 
.70 
.86 
.99 
.78 
.60 
.72 
.52 
23 
35 
3.8 
1.6 
1.4 
.90 
.69 
.73 
.92 
.79 
.62 
.72 
.55 
24 
34 
3.4 
1.6 
1.4 
.88 
.72 
.69 
.88 
.78 
.59 
.72 
.74 
25 
10 
3.0 
1.7 
1.4 
.85 
.74 
.66 
.83 
.76 
.58 
.71 
.68 
26 
6.2 
2.8 
1.6 
1.3 
.83 
.75 
.62 
.84 
.74 
.57 
.68 
.63 
27 
5.1 
2.6 
1.4 
1.3 
.82 
.73 
.69 
.83 
.83 
.57 
.69 
.57 
28 
3.6 
2.5 
1.4 
1.3 
.91 
.69 
1.3 
.84 
.78 
.59 
11 
.54 
29 
21 
2,4 
1.4 
1.3 
---
1.3 
40 
.82 
.75 
.59 
55 
.51 
30 
6.3 
2.4 
1.4 
1.2 
.80 
4.7 
.79 
.76 
2.0 
1.6 
.49 
31 
25 
---
1.3 
1.2 
1.0 
---
3.1 
---
.92 
1.0 
---
TOTAL 
755.6 
252.6 
60.3 
43.9 
33.97 
25.32 
106.49 
398.54 
35.38 
23.31 
89.89 
19.05 
MEAN 
24.4 
8.42 
1.95 
1.42 
1.21 
.82 
3.55 
12.9 
1.18 
.75 
2.90 
.63 
MAX 
251 
87 
2.5 
2.0 
5.9 
1.8 
40 
173 
4.3 
2.0 
55 
1.6 
MIN 
2.3 
2.4 
1.3 
1.2 
.82 
.69 
.62 
.79 
.74 
.57 
.57 
.49 
CFSM 
10.6 
3.66 
.85 
.62 
.53 
.36 
1.54 
5.61 
.51 
.33 
1.26 
.27 
IN. 
12.22 
4.09 
.98 
.71 
.55 
.41 
1.72 
6.45 
.57 
.38 
1.45 
.31 
AC-FT 
1500 
501 
120 
87 
67 
50 
211 
791 
70 
46 
178 
38 
CAL YR 1985 
TOTAL 
2099.59 
MEAN 
5.75 
MAX 
251 
MIN 
.28 
CFSM 
2.50 
IN. 
33.96 
AC-FT 
4160 
WTR YR 1986 
TOTAL 
1844.35 
MEAN 
5.05 
MAX 
251 
MIN 
.49 
CFSM 
2.20 
IN. 
29.83 
AC-FT 
3660 
 
 
 
  
 
   
  
   
178 
RIO GRANDE DE LOIZA BASIN 
50056900 QUEBRADA MAMEY NEAR GURABO, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS MARCH 1984 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON- TEMPERA-
STREAMFLOW, 
SPECIFIC CON- TEMPERA-
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
DEC, 06 1201 
2.1 
612 
24.0 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
179 
RIO GRANDE DE LOIZA BASIN 
50057000 RIO GURABO AT GURABO, PR 
LOCATION.--Lat 18°15'30", long 65°58'05% Hydrologic Unit 21010005, on left bank, at bridge on Highway 181, 
0.3 mi (0.5 km) east or Gurabo, and 4.5 mi (7.6 km) upstream from Rio Grande de Loiza. 
DRAINAGE AREA.--60.2 m1 2 (155.9 km 2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--1958 (occasional low-flow measurements only), January to September 1959 (monthly measurements only), 
October 1959 to current year. 
GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 136.58 ft (41.63 m) above mean sea level. 
REMARKS.--Estimated daily discharges: Nov. 21-27 and June 10-26. Records fair except those for estimated daily discharges, 
which are poor. 
AVERAGE DISCHARGE.--27 years (1960-86), 135 Wits (3.823 m'/s), 30.45 in/yr (773 mm/yr), 97,810 acre-ft/yr (120 hiP/yr); 
median of yearly mean discharges, 130 ft'/s (3.68 e/s), 94,200 acre-ft/yr (116 he/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 74,600 ft'is (2,133 m'/s), Sept. 6, 1960, gage height, 27.7 ft (8.44m), 
from floodmark, from rating curve extended above 8,000 ft'is (227 10/s) on basis of slope-area measurement at gage 
height 21.6 ft (6.58 m), contracted opening, culvert and flow over road measurement at gage height 23.76 ft (7.242 m), 
and estimate of peak flow based on slope-area measurements of Rio Gurabo and Rio Valenciano, 7.0 mi (11.3 km) upstream, 
adjusted for channel storage and flow from intervening area; minimum discharge, 4.5 ft'is (0.127 m'/s), Feb. 21,25, 1968. 
EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate elevation to gage datum of the Aug. 4, 1945 flood, as pointed out by local 
residents, 26.6 ft (8.11 a). 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 ft'/s (85.0 m'/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(W/s) 
00 /s) 
(ft) 
(m) 
Date 
Time 
(W/s) 
(10/s) 
(ft) 
(m) 
Oct. 6 
2045 
*19,300 
547 
*19.37 5.904 
Nov. 15 
1330 
5,370 
152 
11.63 3.545 
Oct. 8 
0315 
5,330 
151 
11.58 3.530 
Apr. 29 
1800 
5,810 
164 
12.16 3.706 
Oct. 23 
1730 
4,160 
118 
10.08 3.072 
May 
13 
1130 
10,600 
300 
15.87 4.837 
Oct. 24 
2000 
4,930 
140 
11.09 3.380 
May 
14 
0245 
12,370 
350 
16.72 5.096 
Oct. 29 
1015 
3,790 
107 
9.56 2.914 
Aug. 29 
0515 
6,680 
189 
13.15 4.008 
Minimum discharge, 12 ft'is (0.340 m'/s), Mar. 25, Apr. 26, 27, May 6. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
DAY 
OCT 
NOV 
DEC 
JAN 
MEAN 
FEB 
VALUES 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
2 
3 
4 
5 
210 
725 
205 
214 
833 
235 
199 
177 
149 
177 
65 
65 
65 
62 
89 
44 
59 
47 
48 
48 
32 
30 
31 
64 
70 
21 
21 
21 
20 
27 
138 
51 
40 
42 
129 
55 
32 
21 
19 
15 
182 
126 
126 
85 
140 
51 
50 
49 
47 
45 
55 
40 
32 
29 
27 
99 
68 
48 
42 
41 
6 
7 
8 
9 
10 
8800 
5470 
1900 
413 
261 
164 
139 
114 
104 
98 
97 
82 
70 
69 
70 
40 
37 
35 
83 
94 
39 
32 
30 
30 
29 
25 
23 
21 
20 
20 
132 
45 
85 
175 
44 
21 
205 
192 
515 
678 
85 
71 
164 
304 
269 
126 
122 
48 
37 
34 
26 
29 
67 
27 
31 
69 
57 
39 
35 
33 
11 
12 
13 
14 
15 
202 
168 
149 
136 
119 
101 
173 
265 
198 
2060 
68 
74 
71 
61 
60 
50 
41 
36 
34 
33 
28 
27 
25 
24 
24 
21 
25 
22 
38 
173 
31 
28 
26 
24 
23 
818 
158 
3090 
3050 
260 
124 
89 
106 
145 
94 
33 
40 
34 
34 
73 
98 
50 
39 
152 
38 
31 
29 
29 
41 
32 
16 
17 
18 
19 
20 
111 
128 
587 
282 
148 
584 
233 
50 
231 
190 
63 
59 
59 
59 
63 
33 
76 
56 
41 
35 
25 
25 
30 
31 
28 
51 
32 
26 
20 
20 
22 
21 
19 
17 
24 
174 
136 
464 
249 
160 
156 
96 
81 
102 
73 
55 
37 
36 
31 
28 
52 
33 
29 
28 
27 
29 
27 
26 
25 
24 
21 
22 
23 
24 
25 
126 
113 
1170 
1840 
860 
410 
125 
96 
88 
83 
55 
54 
52 
53 
50 
37 
35 
35 
43 
46 
28 
27 
25 
23 
23 
19 
19 
16 
19 
16 
21 
20 
16 
16 
15 
136 
128 
104 
88 
72 
60 
59 
66 
51 
50 
28 
26 
26 
25 
25 
23 
25 
30 
30 
31 
23 
24 
29 
57 
49 
26 
27 
28 
29 
30 
31 
351 
317 
240 
973 
384 
406 
80 
78 
72 
69 
66 
---
56 
49 
47 
47 
43 
43 
37 
31 
30 
30 
32 
34 
24 
21 
21 
---
25 
24 
19 
179 
84 
71 
13 
16 
49 
1240 
253 
---
66 
71 
68 
75 
70 
476 
51 
55 
66 
61 
57 
---
23 
24 
27 
34 
285 
146 
27 
26 
102 
1970 
132 
87 
37 
31 
32 
28 
26 
---
TOTAL 
MEAN 
MAX 
MIN 
CFSM 
IN. 
AC-FT 
27841 
898 
8800 
111 
14.9 
17.20 
55220 
7341 
245 
2060 
66 
4.07 
4.54 
14560 
1920 
61.9 
97 
43 
1.03 
1.19 
3810 
1360 
43.9 
94 
30 
.73 
.84 
2700 
846 
30.2 
70 
21 
.50 
.52 
1680 
1138 
36.7 
179 
16 
.61 
.70 
2260 
2775 
92.5 
1240 
13 
1.54 
1.71 
5500 
11666 
376 
3090 
15 
6.25 
7.21 
23140 
3194 
106 
304 
50 
1.76 
1.97 
6340 
1679 
54.2 
285 
23 
.90 
1.04 
3330 
3392 
109 
1970 
23 
1.81 
2.10 
6730 
1160 
38.7 
99 
23 
.64 
.72 
2300 
CAL YR 1985 
WTR YR 1986 
TOTAL 
TOTAL 
80107 
64312 
MEAN 
MEAN 
219 
176 
MAX 
MAX 
10900 
8800 
MIN 
MIN 
16 
13 
CFSM 
CFSM 
3.64 
2.92 
IN. 
IN. 
49.50 
39.74 
AC-FT 
AC-FT 
158900 
127600 
 
 
 
  
 
   
  
    
   
1110 
RIO GRANDE DE LOIZA BASIN 
50057000 RIO GURABO AT GURAGO, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON- TEMPERA-
STREAMFLOW, 
SPECIFIC CON- TEMPERA-
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
DEC, 06 0946 
89 
326 
24.0 
MAR, 11 1250 
19 
390 
27.0 
 
 
         
 
    
 
     
 
 
  
 
 
   
           
           
           
           
 
 
 
 
  
 
         
           
         
           
 
 
           
 
          
 
 
 
     
         
 
 
          
         
          
 
     
 
     
          
 
     
          
181 
RIO GRANDE DE LOIZA BASIN 
50057025 RIO GURABO NEAR GURABO, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18'15 1 5,5", long 65°59'04", at bridge on Highway 941, 1.2 mi (1.9 km) west-northwest from gaging 
station 50057000, and 1.0 mi (1.6 km) northwest of Gurabo plaza. 
DRAINAGE AREA.--62.8 sq mi (162.7 sq km). 
PERIOD OF RECORD.--Water years 1979 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLT- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
29... 
1730 325 
125 6.80 26.0 550 
8.0 
61 54000 55000 
DEC 
19... 
1345 22 
412 7.60 27.5 6.4 
2.8 
35 
22 120000 K6000 
FEB 1986 
26... 
1225 
18 
436 
7.75 
26.5 
5.6 
5.2 
66 
21 
K100 
<10 
APR 
24... 
1015 
18 
430 
7.60 
29.5 
6.0 
5.3 
70 
15 
2000 
K40 
JUL 
14... 
1230 
25 
358 
7.55 
30.0 
2.5 
5.0 
67 
31 
140000 
2000 
SEP 
10... 
1155 
33 
363 
7.70 
30.0 
11 
5.0 
67 
13 
15000 
2000 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD-
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
29... 
37 
0 
8.3 
4.0 
8.2 
0.6 
3.3 
37 
<0.5 
9.5 
8.9 
DEC 
19... 
115 
FEB 1986 
26... 
131 
APR 
24... 
130 
8 
29 
15 
36 
1 
4.6 
126 
<0.5 
18 
39 
JUL 
14... 
117 
SEP 
10... 
110 
0 
25 
12 
27 
1 
4.6 
121 
20 
27 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
29... 
<0.10 
15 
79 
70 
480 
0.250 
0.150 
0.400 
0.360 
1.7 
DEC 
19... 
17 
1.30 
0.100 
1.40 
0.540 
0.26 
FEB 1986 
26... 
7 
1.58 
0.120 
1.70 
0.880 
0.92 
APR 
24... 
0.20 
35 
250 
12 
8 
1.30 
0.100 
1.40 
0.240 
0.86 
JUL 
14... 
14 
0.750 
0.050 
0.800 
0.610 
0.69 
SEP 
10... 
0.20 
32 
220 
19 
12 
1.13 
0.070 
1.20 
0.480 
0.52 
K = non-ideal count 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
  
 
 
  
 
 
 
 
 
 
RIO GRANDE DE LOIZA BASIN 
50057025 RIO GURABO NEAR GURABO, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
29... 
2.1 
2.5 
11 
0.480 
2 
200 
70 
<1 
29 
40 
DEC 
19... 
0.80 
2.2 
9.7 
0.500 
FEB 1986 
26... 
1.8 
3.5 
15 
0.820 
APR 
24... 
1.1 
2.5 
11 
0.720 
2 
100 
60 
<1 
11 
<10 
JUL 
14... 
1.3 
2.1 
9.3 
0.460 
SEP 
10... 
1.0 
2.2 
9.7 
0.620 
MANGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CM) (UG/L) 
(MG/L) 
OCT 1985 
29... 
17000 
4 550 0.10 
<1 
<1 
50 <0.010 
3 0.05 
DEC 
19... 
FEB 1986 
26... 
APR 
24... 
570 
1 
510 
<0.10 
<1 
<1 
20 
<0.010 
<1 
0.07 
JUL 
14... 
SEP 
10... 
182 
 
 
   
    
 
  
 
    
       
  
      
  
  
       
         
          
          
 
 
 
 
       
 
 
         
          
         
          
        
         
         
         
         
  
  
          
        
 
  
 
 
 
    
 
 
  
  
183 
RIO GRANDE DE LOIZA BASIN 
50059000 LAGO LOIZA AT DAMSITE, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°19'49", long 66°01'00", at pumphouse at damsite, and 1.9 mi (3.1 km) south of Tru­
jillo Alto plz.za. 
DRAINAGE AREA.--208 sq mi (539 sq km). 
PERIOD OF RECORD.--Water years 1974 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLT- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIVIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER- OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
NOV 1985 
01... 
1130 
124 
190 
7.10 
27.0 
3.2 
23 
K890 
750 
DEC 
20... 
0845 
124 
312 
7.50 
25.0 
5.8 
63 
54 
42 
FEB 1986 
25... 
1020 
305 
7.35 
25.0 
1.6 
20 
26 
K18 
K35 
APR 
21... 
1430 
124 
288 
7.40 
26.0 
1.2 
15 
22 
96 
50 
JUL 
14... 
1405 
124 
265 
7.00 
31.0 
2.2 
30 
13 
K2 
76 
SEP 
09... 
1335 
170 
162 
7.40 
30.0 
3.4 
45 
<10 
K250 
87 
ALKA-
SOLIDS, 
NITRO-
LINITY 
RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM-
WATER 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
MONIA + 
NITRO-
TOTPL 
SULFIDE DEG. C. NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC 
GEN, 
FIELD 
TOTAL 
SUS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
DATE 
MG/L AS 
(MG/L 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
CACO3 
AS S) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
NOV 1985 
01... 
53 
<0.5 
114 
0.610 
0.090 
0.700 
0.150 
0.45 
0.60 
1.3 
DEC 
20... 
90 
3 
0.480 
0.120 
0.600 
0.230 
0.47 
0.70 
1.3 
FEB 1986 
25... 
92 
3 
0.380 
0.020 
0.400 
0.130 
0.47 
0.60 
1.0 
APR 
21... 
84 
<0.5 
7 
0.180 
0.020 
0.200 
0.310 
0.49 
0.80 
1.0 
JUL 
14... 
90 
10 
0.050 
0.050 
0.100 
0.200 
0.60 
0.80 
0.90 
SEP 
09... 
52 
35 
0.220 
0.080 
0.300 
0.370 
0.63 
1.0 
1.3 
MANGA-
METHY-
BORON, COPPER, IRON, NESE, ZINC, 
LENE 
NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL 
BLUE 
GEN, PHORUS, RECOV- RECOV- RECOV- RECOV- RECOV- CYANIDE 
ACTIVE 
TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(MG/L 
(MG/.. 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS NO3) 
AS P) 
AS B) 
AS CU) 
AS FE) 
AS MN) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
NOV 1985 
01... 
5.8 0.170 
30 
50 4400 110 
20 <0.010 
4 0.03 
DEC 
20... 
5,8 
0.150 
FEB 1986 
25... 
4.4 
0.170 
APR 
21... 
4.4 0.180 
40 
30 370 320 
40 <0.010 
<1 0.07 
JUL 
14... 
4.0 
0.130 
SEP 
09... 
5.8 
0.220 
--
K = non-ideal:count 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
  
 
 
  
 
 
 
 
 
 
 
  
 
 
  
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
  
 
 
 
 
 
 
 
  
 
 
RIO GRANDE DE LOIZA BASIN 
50059100 RIO GRANDE DE LOIZA BELOW TRUJILLO ALTO, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°21'35", long 66°00'15", 100 ft (30 m) downstream of Highway 181 bridge, 0.4 mi (0.6 km) 
northwest of Trujillo Alto plaza, and 2.2 mi (3.5 km) northeast of Lago Loiza Reservoir. 
DRAINAGE AREA.--213 sq mi (552 sq km). 
PERIOD OF RECORD.--Water years 1981 to current year. 
REMARKS: Flow controlled by Lago Loiza reservoir. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CELT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
NOV 1985 
01... 
1435 
30 
209 
7.70 
29.5 
64 
7.6 
22 
3100 
490 
DEC 
20... 
0945 
421 
8.00 
26.0 
1.5 
7.0 
52 
2000 
40 
FEB 1986 
25... 
1310 
11 
402 
8.85 
26.0 
1.1 
13.3 
166 
24 
K860 
200 
APR 
24... 
1410 
6.8 
369 
8.20 
29.5 
4.5 
8.0 
106 
30 
2400 
K35 
JUL 
24... 
1055 
7.8 
347 
8.50 
31.0 
3.0 
11.0 
149 
19 
100 
K10 
SEP 
15... 
1035 
6.7 
342 
8.30 
30.0 
0.60 
10.6 
141 
27 
K18 
K16 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD- 
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
NOV 1985 
01... 
63 
0 
15 
6.1 
13 
0.7 
2.6 
54 
<0.5 
18 
14 
DEC 
20... 
133 
FEB 1986 
25... 
132 
APR 
24... 
120 
5 
30 
12 
27 
1 
2.8 
119 
<0.5 
17 
29 
JUL 
24... 
119 
SEP 
15... 
120 
3 
29 
11 
25 
1 
2.8 
115 
24 
24 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL 
-OTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
NOV 1985 
01... 
<0.10 
<0.1 
130 
90 
0.700 
0.100 
0.800 
0.150 
0.55 
DEC 
20... 
1 
0.970 
0.030 
1.00 
0.030 
0.27 
FEB 1986 
25... 
2 
0.480 
0.020 
0.500 
'0.060 
0.44 
APR 
24... 
0.20 
23 
210 
3.9 
1 
0.270 
0.030 
0.300 
0.070 
0.73 
JUL 
24... 
23 
<0.010 
0.100 
0.030 
0.27 
SEP 
15... 
0.20 
24 
210 
3.8 
1 
<0.010 
0.200 
0.030 
0.57 
184 
 
 
    
    
 
          
         
          
    
    
          
   
    
 
    
  
        
          
       
 
          
           
185 
RIO GRANDE DE LOIZA BASIN 
50059100 RIO GRANDE DE LOIZA BELOW TRUJILLO ALTO, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
M)NIA + 
NITRO 
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS W) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
NOV 1985 
01... 
0.70 
1.5 
6.6 
0.180 
1 
<100 
30 
1 
17 
20 
DEC 
20... 
0.30 
1.3 
5.8 
0.260 
FEB 1986 
25... 
0.50 
1.0 
4.4 
0.310 
APR 
24... 
0.80 
1.1 
4.9 
0.320 
1 
100 
30 
<1 
11 
10 
JUL 
24... 
0.30 
0.40 
1.8 
0.250 
SEP 
15... 
0.60 
0.80 
3.5 
0.180 
MANGA-
METHY-
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MGM 
NOV 1985 
01... 
4000 
4 
140 
<0.10 
<1 
<1 
70 
<0.010 
5 
0.04 
DEC 
20... 
FEB 1986 
25... 
APR 
24... 
650 
<1 
180 
<0.10 
<1 
<1 
30 
<0.010 
1 
0.06 
JUL 
24... 
SEP 
15... 
I
I
I
  
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
  
 
186 
RIO GRANDE DE LOIZA BASIN 
50061800 RIO CANOVANAS NEAR CAMPO RICO, PR 
LOCATION.--Lat 18°19'08", long 65'53'21', Hydrologic Unit 21010005, at center pier on downstream side of bridge, on 
paved secondary road, 0.4 i (0.6 km) northeast of junction of Highways 185 and 186, 1.5 mi (2.4 km) south of Campo 
Rico, and 4.4 mi (7.1 km) south of Loiza. 
DRAINAGE AREA.--9.84 mi' (25.48 km=). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--March 1967 to current year. 
GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 225 ft (68 m), from topographic map. 
REMARKS.--Estimated daily discharges: Feb. 9-11. Records fair except those for estimated daily discharges, which are poor. 
AVERAGE DISCHARGE.--19 years (1968-86), 28.5 ft'is (0.807 m'/s), 39.33 in/yr (999 mm/yr), 20,650 acre-ft/yr (25.5 hmYyr); 
median of yearly mean discharges, 27 ft'is (0.76 10/s), 19,600 acre-ft/yr (24 hp0/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 15,000 ft'is (425 m3/s). Sept. 13, 1982, gage height, 13.1 ft (3.99 m), 
from floodmarks, from rating curve extended above 350 ft'is (9.91 mi/s) on basis of slope-area measurements and step-
backwater analysis made in 1981; minimum daily discharge, 0.80 ft'/s (0.023 '/s), July 24, 1977. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ft'/s (70.8 '/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time (W/s) (m'/s) (ft) (m) 
Date Time (W/s) (m3/s) (ft) (m) 
Oct. 6 
1800 
*6,960 
197 
*9.80 2.987 
May 13 
2315 
5.710 
162 
8.98 2.737 
Nov. 15 
1800 
2,740 
77.6 
6.59 2.009 
Minimum discharge, 3.5 ft'is (0.099 m'/s), Apr. 26. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
29 
46 
36 
15 
8.4 
5.6 
19 
16 
41 
9.0 
10 
24 
2 
157 
41 
34 
17 
9.1 
5.1 
8.1 
25 
26 
8.9 
7.8 
13 
3 
47 
38 
33 
17 
17 
5.0 
23 
9.1 
23 
8.5 
7.1 
10 
4 
55 
43 
32 
21 
32 
5.1 
15 
6.9 
21 
8.4 
7.0 
8.8 
5 
180 
44 
35 
17 
27 
7.6 
116 
5.7 
19 
8.0 
6.1 
8.3 
6 
1050 
40 
34 
15 
14 
5.6 
35 
5.8 
17 
10 
5.7 
10 
7 
640 
33 
31 
14 
11 
5.2 
13 
14 
16 
12 
5.5 
10 
8 
202 
29 
29 
14 
9.4 
4.7 
9.8 
30 
15 
7.9 
6.6 
7.7 
9 
93 
29 
30 
45 
8.6 
5.6 
10 
171 
42 
6.7 
5.4 
7.0 
10 
69 
26 
29 
21 
8.4 
5.6 
7.9 
82 
22 
6.7 
4.9 
6.9 
11 
57 
36 
31 
13 
8.3 
5.9 
7.0 
94 
18 
5.8 
18 
6.5 
12 
49 
138 
32 
11 
7.8 
5.6 
6.4 
25 
16 
6.6 
19 
6.7 
13 
45 
249 
28 
11 
7.2 
6.3 
6.6 
571 
17 
5.9 
23 
7.3 
14 
41 
132 
25 
10 
7.0 
7.8 
6.2 
355 
17 
6.5 
21 
8.7 
15 
37 
743 
28 
11 
7.3 
18 
5.8 
49 
17 
16 
11 
7.2 
16 
35 
215 
25 
11 
6.9 
8.6 
6.1 
33 
17 
11 
9.8 
6.7 
17 
34 
111 
24 
12 
7.2 
7.0 
6.0 
27 
18 
11 
7.6 
6.6 
18 
166 
127 
22 
11 
6.9 
5.3 
5.8 
45 
15 
8.2 
6.2 
6.3 
19 
62 
75 
21 
10 
6.7 
5.0 
5.2 
36 
14 
6.7 
6.3 
6.2 
20 
42 
142 
21 
8.8 
7.0 
5.1 
5.1 
26 
15 
5.9 
6.2 
5.7 
21 
35 
265 
21 
9.5 
6.3 
4.9 
5.5 
23 
13 
5.9 
5.5 
6.1 
22 
33 
80 
21 
10 
6.2 
4.3 
5.3 
21 
12 
6.0 
5.8 
6.7 
23 
273 
69 
20 
11 
5.9 
4.3 
4.2 
18 
11 
5.7 
5.6 
7.1 
24 
304 
62 
20 
14 
5.5 
5.3 
4.8 
17 
12 
5.6 
6.9 
6.7 
25 
124 
52 
19 
13 
5.8 
5.6 
4.8 
16 
11 
5.8 
6.2 
7.2 
26 
69 
48 
20 
9.8 
6.1 
5.5 
4.0 
15 
11 
5.3 
5.6 
8.1 
27 
60 
45 
18 
9.3 
5.7 
5.8 
4.3 
15 
14 
4.9 
4.9 
7.9 
28 
65 
42 
18 
8.7 
5.7 
6.3 
7.7 
73 
11 
5.5 
96 
6.7 
29 
94 
40 
17 
8.9 
---
17 
43 
30 
9.5 
8.5 
319 
5.9 
30 
56 
39 
16 
8.9 
15 
25 
21 
9.3 
67 
20 
6.1 
31 
59 
---
16 
9.9 
7.9 
---
176 
---
35 
16 
---
TOTAL 
4262 
3079 
786 
417.8 
264.4 
211.6 
425.6 
2051.5 
519.8 
324.9 
685.7 
242.1 
MEAN 
137 
103 
25.4 
13.5 
9.44 
6.83 
14.2 
66.2 
17.3 
10.5 
22.1 
8.07 
MAX 
1050 
743 
36 
45 
32 
18 
116 
571 
42 
67 
319 
24 
MIN 
29 
26 
16 
8.7 
5.5 
4.3 
4.0 
5.7 
9.3 
4.9 
4.9 
5.7 
CFSM 
13.9 
10.5 
2.58 
1.37 
.96 
.69 
1.44 
6.73 
1.76 
1.07 
2.25 
.82 
IN. 
16.11 
11.64 
2.97 
1.58 
.00 
.80 
1.61 
7.76 
1.97 
1.23 
2.59 
.92 
AC-FT 
8450 
6110 
1560 
829 
524 
420 
844 
4070 
1030 
644 
1360 
480 
CAL YR 1985 TOTAL 
15944.2 
MEAN 
43.7 
MAX 
1050 
MIN 
4.8 
CFSM 4.44 
IN. 
60.28 
AC-FT 
31630 
WTR YR 1986 TOTAL 
13270.4 
MEAN 
36.4 
MAX 
1050 
MIN 
4.0 
CFSM 3.70 
IN. 
50.17 
AC-FT 
26320 
 
187 
RIO GRANDE DE LOIZA BASIN 
50061800 RIO CANOVANAS NEAR CAMPO RICO, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
STREAMFLOW, 
SPECIFIC CON-
TEMPERA­
DATE 
TIME 
INSTANTANEOUS 
DUCTANCE 
TURE 
DATE 
TIME 
INSTANTANEOUS 
DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
MAY, 16 0940 
34 
146 
23.0 
AUG, 18 1428 
6.0 
229 
30.0 
JUN, 19 1340 
13 
209 
28.5 
SEP, 10 1330 
6.6 
207 
29.5 
JUL, 16 1453 
9 
224 
30.0 
 
 
 
189 
ATLANTIC 
OCEAN 
UQUILLO 
Rib Grande de Laza basin 
Drainage boundary-. 
LAS PIEDRAS ,' 
Rib Humacao basin 
° Coasialbasin 
Mop ore 
5A11 JuAN 
EXPLANATION 
A0670 SURFACE—WATER STATION AND NUMBER 
V0725 QUALITY—OF—WATER STATION AND NUMBER 
4 
5 K€LOME'MRS 
4 
5 WLES 
Figure 19.--Northeastern river basins--Rio Herrera to Rio Anton Ruiz basins. 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
 
 
   
 
 
   
RIO ESPIRITU SANTO BASIN 
50063440 QUEBRADA SONADORA NEAR EL VERDE, PR 
LOCATION.--Lat 18'19'24', long 65'49'03', Hydrologic Unit 21010005, in Caribbean National Forest, at El Yunque. 
0.6 mi (1.0 km) upstream from Rio Espiritu Santo, 0.2 mi (0.3 km) upstream from Highway 185, and about 1.2 mi 
(1.9 km) south of El Verde. 
DRAINAGE AREA.--1.01 mi' (2.62 km'). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--March 1983 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 1,230 ft (375 m), from topographic map. 
REMARKS.--Estimated daily discharges: Feb. 8-11. Records poor. 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,160 ft'is (61.2 s'/s), May 14, 1985, gage height, 9.36 ft 
(2.853 m) from rating curve extended above 20 ft3/s (0.57 20/s) on basis of step-backwater analysis; minimum 
discharge, 0.20 ft'is (0.006 m'/s), July 14, 15. 1985. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft'is (14.2 m3/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft3/s) (m'/s) 
(ft) 
(m) 
Date 
Time (W/s) (m3/s) 
(ft) 
(m) 
Oct. 24 
1400 
698 
19.8 
7.52 
2.292 
Aug. 13 
1845 
595 
16.8 
7.30 
2.225 
May 13 
0830 
569 
16.1 
7.24 
2.207 
Aug. 24 
1845 *2,120 
60.0 
*9.32 
2.841 
Minimum discharge, 0.46 ft'/s (0.013 m'/s), Mar. 8. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
6.5 
4.6 
2.8 
2.8 
1.8 
.80 
6.2 
28 
3.7 
2.6 
3.0 
7.7 
2 
14 
6.1 
2.9 
4.1 
2.7 
.70 
3.2 
13 
2.2 
3.1 
1.7 
4.3 
3 
12 
4.4 
2.1 
12 
4.9 
.62 
7.9 
3.3 
1.9 
6,0 
1.4 
3.3 
4 
6.3 
3.8 
2.5 
9.9 
22 
.86 
11 
2.3 
1.7 
2.6 
1.7 
2.9 
5 
20 
3.7 
7.7 
4.0 
7.4 
.88 
28 
1.8 
1.7 
6.4 
.91 
2.8 
6 
132 
3.0 
5.7 
3.1 
4.7 
.59 
11 
2.2 
1.5 
11 
.69 
4.2 
7 
53 
3.0 
3.5 
3.1 
3.7 
.57 
5.0 
9.5 
1.5 
8.9 
5.1 
2.8 
8 
13 
2.4 
2.3 
3.5 
2.2 
.51 
3,7 
4.7 
1.6 
3.4 
1.5 
2.2 
9 
8.2 
2.2 
3.0 
20 
1.9 
1.0 
3.5 
8.1 
6.2 
2.6 
1.2 
1.9 
10 
5.7 
2.0 
3.8 
6.0 
1.7 
.91 
2.9 
8.5 
13 
2.2 
1.4 
1.7 
11 
4.3 
11 
4.8 
4.8 
1.4 
1.9 
2,7 
9.2 
3.5 
2.1 
9.1 
1.5 
12 
3.6 
37 
12 
3.8 
1.2 
1.2 
2.5 
3.0 
4.2 
4.2 
5.1 
1.3 
13 
3.1 
46 
4.0 
3.3 
.97 
3.9 
2.4 
50 
13 
2.2 
42 
1.2 
14 
3.2 
24 
2.6 
2.9 
.99 
7.5 
2.2 
27 
10 
2.4 
10 
1.1 
15 
2.2 
99 
5.1 
2.9 
.91 
8.5 
2.1 
5.2 
11 
14 
12 
.96 
16 
1.9 
17 
3.4 
3.4 
.70 
7.9 
2.3 
3.5 
10 
8.4 
3.8 
.86 
17 
1.5 
11 
3.3 
5.4 
1.7 
1.8 
2.3 
3.2 
0.2 
10 
2.8 
.74 
18 
13 
15 
2.7 
4.0 
1.4 
1.4 
2.0 
17 
3.8 
3.5 
2.2 
.65 
19 
13 
7.6 
4.4 
2.8 
18 
1.1 
1.8 
5.6 
6.6 
2.7 
1.9 
.56 
20 
8.8 
22 
7.2 
3.3 
4.5 
1.5 
1.7 
3.5 
5.0 
2.3 
1.7 
.49 
21 
4.3 
24 
7.1 
3.9 
1.9 
1.2 
3.5 
3.3 
4.2 
2.4 
1.5 
.99 
22 
6.3 
5.3 
9.9 
3.1 
1.5 
.81 
1.9 
3.5 
3.3 
2.0 
1.7 
1.9 
23 
53 
5.9 
4.6 
5.4 
1.3 
.66 
1.6 
2.7 
3.3 
1.8 
15 
3.5 
24 
88 
5.9 
4.8 
6.0 
1.2 
1.4 
1.6 
2.4 
3.3 
1.8 
72 
1.5 
25 
13 
4.2 
3.3 
3.2 
1.1 
4.3 
1.4 
2.1 
2.6 
1.8 
8.2 
2.5 
26 
7.8 
3.4 
4.2 
2.3 
.95 
1.6 
1.3 
1.9 
3.3 
1.5 
3.9 
2.3 
27 
7.2 
3.0 
2.7 
2.0 
.86 
2.6 
1.9 
1.9 
11 
1.5 
3.2 
4.8 
28 
5.8 
2.6 
5.1 
1.8 
.86 
7.1 
8.5 
2.8 
3.6 
1.5 
43 
2.6 
29 
8.6 
2.6 
2.9 
1.7 
--- 
23 
19 
4.1 
2.7 
34 
27 
4.6 
30 
5.5 
5.0 
2.3 
2.9 
--- 
6.8 
8.7 
3.0 
2.3 
22 
5.5 
2.3 
31 
5.9 
--- 
2.1 
2.2 
9.4 
--- 
12 
--- 
5.4 
4.4 
--- 
TOTAL 
530.7 
386.7 
134.8 
139.6 
94.44 
103.01 
153.8 
248.3 
147.9 
176.3 
294.60 
70.15 
MEAN 
17.1 
12.9 
4.35 
4.50 
3.37 
3.32 
5.13 
8.01 
4.93 
5.69 
9.50 
2.34 
MAX 
132 
99 
12 
20 
22 
23 
28 
50 
13 
34 
72 
7.7 
MIN 
1.5 
2.0 
2.1 
1.7 
.70 
.51 
1.3 
1.8 
1.5 
1.5 
.69 
.49 
CFSM 
16.9 
12.8 
4.31 
4.46 
3.34 
3.29 
5.08 
7.93 
4.88 
5.63 
9.41 
2.32 
IN. 
19.55 
14.24 
4.96 
5.14 
3.48 
3.79 
5.66 
9.15 
5.45 
6.49 
10.85 
2.58 
AC-FT 
1050 
767 
267 
277 
187 
204 
305 
493 
293 
350 
584 
139 
CAL YR 1985 TOTAL 
2737.98 
MEAN 
7.50 
MAX 
132 
MIN 
.23 
CFSM 7.43 
IN. 100.84 
AC-FT 
5430 
WTR YR 1986 TOTAL 
2480.30 
MEAN 
6.80 
MAX 
132 
MIN 
.49 
CFSM 6.73 
IN. 
91.35 
AC-FT 
4920 
190 
 
191 
RIO ESPIRITU SANTO BASIN 
50063440 QUEBRADA SONADORA NEAR EL VERDE, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS APRIL 1983 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
DATE 
TIME 
MAY, 15 1450 
JUN, 20 0929 
JUL, 15 1035 
STREANFLOW, 
INSTANTANEOUS 
(CFS) 
4.8 
4.3 
17 
SPECIFIC CON-
DUCTANCE 
(UMHOS) 
50 
51 
59 
TEMPERA-
TURE 
(DEG C) 
21.5 
21.5 
22.0 
DATE 
TIME 
AUG, 19 0958 
SEP, 11 0937 
STREAMFLOW, 
INSTANTANEOUS 
(CFS) 
2.0 
1.5 
SPECIFIC CON-
DUCTANCE 
(UMHOS) 
60 
64 
TEMPERA-
TURE 
(DEG C) 
22.5 
22.5 
 
  
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
192 
RIO ESPIRITU SANTO BASIN 
50063500 QUEBRADA TORONJA AT EL VERDE. PR 
LOCATION.--Lat 18°19'43% long 65'49E14", Hydrologic Unit 21010005, in Caribbean National Forest, at downstream 
side of culvert on Highway 186, 0.2 mi (0.3 km) upstream from Rio Espiritu Santo, and about 0.9 mi (1.4 km) 
south of El Verde. 
DRAINAGE AREA.--0.064 mi' (0.166 km'). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--April 1983 to current year. 
GAGE.--Water-stage recorder and concrete broad-V-notch crested weir. Elevation of gage is 876 ft (267 m), from 
topographic map. 
REMARKS.--No estimated daily discharges during water year. Records poor. 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 18 ft'iis (0.51 m'/s), July 5, 1983, gage height, 1.71 ft 
(0.521 m), from rating curve extended above 1.0 ft'/s (0.03 m'/s) on basis of step-backwater analysis; minimum 
discharge, no flow for part of each day Apr. 10, 17, 1983. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 13 ft'/s (0.37 m'/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time (ft'/s) (10/s) (ft) (m) 
Date 
Time (W/s) (m'/s) (ft) (m) 
Oct. 24 
1530 
*17 
0.48 
*1.69 
0.515 
May 14 
0030 
14 
0.40 
1.64 
0.500 
May 
1 
2115 
13 
0.37 
1.63 
0.497 
Aug. 24 
1930 
14 
0.40 
1.65 
0.503 
Minimum discharge. 0.04 ft'is (0.001 ms/s), July 8-14, 18-24. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
.32 
.50 
.15 
.11 
.07 
.08 
.09 
1.7 
.24 
.08 
.13 
.87 
2 
.49 
.45 
.12 
.13 
.09 
.08 
.06 
1.1 
.21 
.09 
.09 
.40 
3 
.67 
.35 
.10 
.21 
.21 
.07 
.32 
.45 
.18 
.07 
.09 
.30 
4 
.44 
.33 
.09 
.26 
.98 
.08 
.25 
.26 
.18 
.05 
.09 
.27 
5 
.92 
.42 
.15 
.13 
.25 
.07 
.31 
.22 
.17 
.09 
.08 
.24 
6 
6.8 
.31 
.12 
.12 
.14 
.07 
.21 
.25 
.17 
.11 
.07 
.18 
7 
5.2 
.27 
.10 
.11 
.12 
.07 
.10 
.66 
.17 
.07 
.11 
.15 
8 
2.0 
.25 
.09 
.13 
.10 
.07 
.11 
.34 
.15 
.05 
.07 
.14 
9 
1.5 
.27 
.08 
.59 
.09 
.08 
.09 
.57 
.26 
.05 
.07 
.14 
10 
1.1 
.24 
.08 
.18 
.08 
.08 
.06 
.67 
.34 
.05 
.09 
.13 
11 
.93 
.43 
.08 
.14 
.08 
.08 
.06 
.63 
.16 
.04 
.22 
.11 
12 
.78 
1.7 
.19 
.12 
.07 
.08 
.05 
.37 
.17 
.06 
.17 
.11 
13 
.58 
2.8 
.12 
.12 
.07 
.16 
.06 
2.9 
.23 
.04 
1.6 
.09 
14 
.49 
1.7 
.11 
.13 
.07 
.18 
.05 
2.9 
.21 
.06 
.49 
.09 
15 
.45 
5.3 
.14 
.15 
.07 
.19 
.05 
.80 
.21 
.26 
.36 
.09 
16 
.42 
1.9 
.10 
.14 
.06 
.17 
.07 
.48 
.35 
.07 
.18 
.08 
17 
.40 
1.2 
.08 
.16 
.07 
.08 
.08 
.45 
.17 
.08 
.15 
.08 
18 
.56 
1.2 
.08 
.14 
.06 
.07 
.06 
.96 
.13 
.05 
.13 
.07 
19 
.82 
.71 
.09 
.12 
.13 
.08 
.06 
.44 
.13 
.04 
.11 
.07 
20 
.71 
.83 
.14 
.13 
.09 
.07 
.06 
.35 
.12 
.04 
.09 
.07 
21 
.42 
1.1 
.15 
.12 
.06 
.07 
.27 
.30 
.11 
.04 
.08 
.09 
22 
.44 
.48 
.26 
.12 
.05 
.07 
.07 
.25 
.09 
.04 
.09 
.09 
23 
3.3 
.45 
.13 
.10 
.05 
.06 
.06 
.22 
.09 
.04 
.16 
.08 
24 
4.5 
.36 
.13 
.10 
.05 
.08 
.06 
.21 
.08 
.10 
1.5 
.07 
25 
2.3 
.36 
.10 
.08 
.07 
.12 
.06 
.20 
.08 
.08 
.62 
.09 
26 
1.3 
.27 
.11 
.07 
.08 
.06 
.06 
.18 
.10 
.07 
.23 
.09 
27 
1.0 
.22 
.09 
.07 
.08 
.06 
.08 
.19 
.13 
.07 
.20 
.12 
28 
.80 
.20 
.10 
.06 
.08 
.06 
.22 
.63 
.09 
.08 
2.2 
.14 
29 
.80 
.18 
.13 
.07 
.59 
.27 
.58 
.08 
.89 
1.9 
.15 
30 
.66 
.20 
.11 
.07 
.11 
.71 
.27 
.08 
.71 
.54 
.06 
31 
.63 
---
.12 
.08 
.11 
---
.45 
---
.19 
.39 
---
TOTAL 
41.73 
24.98 
3.64 
4.26 
3.42 
3.30 
4.06 
19.98 
4.88 
3.76 
12.30 
4.66 
MEAN 
1.35 
.83 
.12 
.14 
.12 
.11 
.14 
.64 
.16 
.12 
.40 
.16 
MAX 
6.8 
5.3 
.26 
.59 
.98 
.59 
.71 
2.9 
.35 
.85 
2.2 
.87 
MIN 
.32 
.18 
.08 
.06 
.05 
.06 
.05 
.18 
.08 
.04 
.07 
.06 
CFSM 
21.1 
13.0 
1.87 
2.19 
1.87 
1.72 
2.19 
10.0 
2.50 
1.87 
6.25 
2.50 
IN. 
24.26 
14.52 
2.12 
2.48 
1.99 
1.92 
2.36 
11.61 
2.84 
2.19 
7.15 
2.71 
AC-FT 
83 
50 
7.2 
8.4 
6.8 
6.5 
8.1 
40 
9.7 
7.5 
24 
9.2 
CAL YR 1985 TOTAL 
148.74 
MEAN 
.41 
MAX 
6.8 
MIN 
.03 
CFSM 6.41 
IN. 
86.46 
AC-FT 
295 
WTR YR 1986 TOTAL 
130.97 
MEAN 
.36 
MAX 
6.8 
MIN 
.04 
CFSM 5.62 
IN. 
76.13 
AC-FT 
260 
 
193 
RIO ESPIRITU SANTO BASIN 
50063500 QUEBRADA TORONJA AT EL VERDE, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS APRIL 1983 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
DATE 
TIME INSTANTANEOUS 
DUCTANCE 
TURE 
DATE 
TIME INSTANTANEOUS 
DUCTANCE 
TURE 
(US) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
MAY, 15 1543 
0.59 
82 
22.5 
AUG, 19 1143 
0.10 
119 
23.5 
JUN, 20 1121 
.10 
117 
23.0 
SEP, 11 1122 
.11 
119 
24.5 
JUL, 15 1256 
.20 
111 
23.0 
 
I
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
194 
RIO ESPIRITU SANTO BASIN 
50063800 RIO ESPIRITU SANTO NEAR RIO GRANDE. PR 
LOCATION.--Lat 18°21'37', long 65°48'49', Hydrologic Unit 21010005, at left abutment, on downstream side of bridge 
on Highway 966. 0.1 mi (0.2 km) upstream from Quebrada Jimenez, and 1.9 mi (3.1 km) southeast of Rio Grande. 
DRAINAGE AREA.--8.62 mil (22.33 km'). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--February 1959 to April 1963 (annual low-flow and occasional measurements only), August 1966 to 
current year. 
GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 40 ft (12 
), from topographic map. 
REMARKS.--Estimated daily discharges: Oct. 2, 5-8, June 15. 16, 27 and Aug. 31 to Sept. 8. Records fair except 
those for estimated daily discharges, which are poor. 
AVERAGE DISCHARGE.--20 years (1967-86), 57.5 ft'is (1.628 m'/s), 90.59 in/yr (2,301 mm/yr), 41,660 acre-ft/yr 
(51.4 hm,/yr); median of yearly mean discharges, 52 ft'/s (1.47 10/s), 37,700 acre-ft/yr (46 hi0/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum dis.charge, 12,400 ft'is (351 10/s), Dec. 2, 1983, gage height, 12.07 ft 
(3.679 m), from rating curve extended above 600 ft'/s (17.0 0/s) on basis of step-backwater analysis; minimum 
discharge. 4.0 ft'is (0.113 m'/s), July 3-5, 1975, Apr. 14, 15, 1984. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 ft'/s (85.0 m'/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft'/s) 
(10/s) 
(ft) 
(m) 
Date 
lime 
(W/s) 
(e/s) 
(ft) 
(m) 
Oct. 
6 
unknown 
3,490 
98.8 
7.59 
2.313 
July 29 
1645 
3,240 
91.8 
7.40 
2.256 
Oct. 24 
1430 
*7,400 
210 
*9.94 
3.030 
Aug. 13 
1845 
5,190 
147 
8.74 
2.664 
Nov. 15 
1345 
3,150 
89.2 
7.32 
2.231 
Aug. 24 
1845 
6,480 
184 
9.47 
2.886 
May 
13 
0915 
6,330 
179 
9.39 2.862 
Minimum discharge, 7.7 ft'is (0.218 m3 /s), July 26, 27. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
30 
41 
31 
19 
17 
11 
35 
283 
36 
17 
24 
54 
2 
130 
48 
33 
31 
35 
11 
23 
227 
22 
18 
17 
36 
3 
83 
36 
25 
60 
46 
10 
80 
90 
19 
30 
14 
30 
4 
45 
40 
26 
106 
207 
11 
51 
23 
18 
18 
15 
27 
5 
150 
60 
59 
28 
84 
13 
210 
18 
17 
28 
12 
26 
6 
850 
38 
42 
22 
40 
10 
77 
24 
16 
63 
11 
30 
7 
530 
29 
30 
20 
27 
11 
27 
95 
15 
44 
28 
30 
8 
170 
25 
22 
22 
21 
9.7 
49 
36 
18 
20 
14 
23 
9 
86 
24 
29 
174 
18 
12 
26 
87 
70 
16 
14 
20 
10 
62 
23 
31 
52 
16 
12 
16 
74 
72 
15 
13 
19 
11 
50 
68 
39 
33 
16 
18 
14 
96 
32 
14 
118 
18 
12 
41 
332 
88 
25 
15 
14 
13 
27 
26 
25 
53 
17 
13 
36 
492 
37 
22 
14 
27 
13 
741 
54 
16 
446 
17 
14 
35 
213 
22 
20 
14 
38 
12 
386 
73 
14 
105 
19 
15 
30 
1170 
38 
20 
15 
77 
11 
51 
85 
91 
67 
17 
16 
28 
217 
27 
22 
13 
58 
28 
34 
100 
28 
24 
17 
17 
29 
120 
25 
33 
15 
17 
14 
28 
39 
67 
19 
16 
18 
164 
185 
22 
30 
17 
13 
11 
122 
27 
19 
15 
16 
19 
135 
81 
26 
20 
75 
11 
11 
44 
36 
14 
14 
15 
20 
97 
124 
50 
21 
43 
12 
10 
28 
32 
12 
13 
15 
21 
42 
310 
48 
26 
17 
12 
101 
25 
27 
11 
13 
16 
22 
39 
65 
93 
20 
14 
9.9 
13 
27 
23 
11 
13 
22 
23 
630 
60 
40 
31 
14 
9.3 
11 
22 
21 
9 9 
75 
25 
24 
995 
68 
37 
41 
13 
12 
10 
20 
20 
11 
452 
18 
25 
167 
55 
24 
25 
12 
21 
9.5 
18 
18 
11 
78 
22 
26 
129 
39 
32 
18 
12 
15 
9.0 
18 
17 
8.4 
24 
22 
27 
86 
34 
22 
17 
11 
17 
12 
20 
70 
8.5 
19 
34 
28 
59 
32 
36 
16 
11 
41 
32 
92 
21 
9.1 
431 
21 
29 
89 
31 
22 
16 
188 
140 
89 
17 
360 
325 
34 
30 
53 
45 
18 
20 
39 
166 
36 
16 
228 
46 
21 
31 
56 
---
17 
18 
37 
---
125 
---
52 
41 
---
TOTAL 
5126 
4105 
1091 
1028 
852 
796.9 
1234.5 
3006 
1057 
1288.9 
2553 
697 
MEAN 
165 
137 
35.2 
33.2 
30.4 
25.7 
41.1 
97.0 
35.2 
41.6 
82.4 
23.2 
MAX 
995 
1170 
93 
174 
207 
188 
210 
741 
100 
360 
452 
54 
MIN 
28 
23 
17 
16 
11 
9.3 
9.0 
18 
15 
. 
8.4 
11 
15 
CFSM 
19.1 
15.9 
4.08 
3.85 
3.53 
2.98 
4.77 
11.3 
4.08 
4.83 
9.56 
2.69 
IN. 
22.12 
17.72 
4.71 
4.44 
3.68 
3.44 
5.33 
12.97 
4.56 
5.56 
11.02 
3.01 
AC-FT 
10170 
8140 
2160 
2040 
1690 
1580 
2450 
5960 
2100 
2560 
5060 
1380 
CAL YR 1985 
TOTAL 
25171.2 
MEAN 
69.0 
MAX 
1170 
MIN 
5.9 
CFSM 
8.00 
IN. 
108.63 
AC-FT 
49930 
WTR YR 1986 
TOTAL 
22835.3 
MEAN 
62.6 
MAX 
1170 
MIN 
8.4 
CFSM 
7.26 
IN. 
98.55 
AC-FT 
45290 
 
 
         
 
    
 
     
 
 
 
 
  
 
         
           
         
 
 
 
     
         
 
 
          
         
      
   
 
     
 
 
   
      
   
 
 
  
      
  
195 
RIO ESPIRITU SANTO BASIN 
50063800 RIO ESPIRITU SANTO NEAR RIO GRANDE, PR--Continued 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1958, 1961-66, 1968 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
24... 
1100 
555 
70 
7.70 
23.5 
44 
9.4 
27 
620 
K4000 
DEC 
13... 
1130 
36 
103 
7.50 
21.0 
2.6 
6.2 
52 
3500 
2000 
FEB 1986 
12... 
1045 
15 
121 
7.90 
22.5 
1.5 
8.4 
11 
490 
200 
APR 
17... 
1025 
15 
106 
7.80 
24.0 
44 
9.0 
108 
15 
K1800 
820 
JUL 
03... 
1000 
41 
92 
7.45 
26.0 
5.2 
8.6 
106 
40 
3000 
930 
SEP 
08... 
1205 
21 
100 
7.45 
27.0 
0.70 
8.5 
107 
<10 
K620 
270 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM ROTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AO-
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
24... 
9 
0 
1.9 
1.1 
3.5 
0.5 
0.30 
13 
<0.5 
7.5 
4.4 
DEC 
13... 
23 
FEB 1986 
12... 
38 
APR 
17... 
32 
0 
6.8 
3.7 
7.8 
0.6 
0.60 
32 
<0.5 
4.9 
10 
JUL 
03... 
28 
SEP 
08... 
32 
0 
6.6 
3.8 
7.7 
0.6 
0.60 
33 
4.7 
9.1 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
24... 
<0.10 
6.2 
33 
49 
59 
0.020 
<0.100 
0.040 
0.36 
DEC 
13... 
1 
0.160 
0.140 
0.300 
5.80 
2.4 
FEB 1986 
12... 
1 
<0.010 
<0.100 
0.010 
0.19 
APR 
17... 
<0.10 
20 
73 
2.9 
6 
<0.010 
<0.100 
0.040 
0.26 
JUL 
03... 
10 
<0.010 
<0.100 
<0.010 
SEP 
08... 
<0.10 
20 
72 
4.1 
4 
<0.010 
<0.100 
<0.010 
K = non-ideal count 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
RIO ESPIRITU SANTO BASIN 
50063800 RIO ESPIRITU SANTO NEAR RIO GRANDE, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
24... 
0.40 
0.040 
<1 
<100 
30 
1 
1 
10 
DEC 
13... 
8.2 
8.5 
38 
1.50 
FEB 1986 
12... 
0.20 
<0.010 
APR 
17... 
0.30 
0.020 
<1 
100 
,-10 
<1 
10 
10 
JUL 
03... 
0.30 
0.010 
SEP 
08... 
0.20 
0.020 
MANGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
24... 
2000 
1 
40 
<0.10 
<1 
<1 
30 
<0.010 
<1 
0.05 
DEC 
13,.. 
FEB 1986 
12... 
APR 
17... 
260 
2 
20 
<0.10 
<1 
<1 
240 
<0.010 
2 
0.04 
JUL 
03... 
SEP 
08... 
196 
I 
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197 
RIO MAMEYES BASIN 
50065500 RIO MAMEYES NEAR SABANA, PR 
LOCATION.--Lat 18°19'46", long 65°45'04", on left bank, at bridge on Highway 988, 1.4 mi (2.3 km) west of Sabana, 
2.0 mi (3.2 km) downstream from Rio de la Mina, and 3.2 mi (5.1 km) southeast of Maseyes. 
DRAINAGE AREA.--6.88 all' (17.82 km 2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--August 1967 to December 1973. June 1983 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 275 ft (84 m), fro topographic map. 
REMARKS.--Estimated (tally discharges: Nov. 2-14. Records fair except those for estimated daily discharges, 
which are poor. 
AVERAGE DISCHARGE.--3 years (1968-73, 1984-86), 58.0 ft'is (1.642 m'/s), 114.48 in/yr (2,908 mm/yr), 
42,000 acre-ft/vr (51.8 hm'/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 19,800 ft'/s (561 m 3/s), Sept. 4, 1973, gage height, 
13.02 ft (3.968 m), from rating curve extended above 1,800 ft'is (51.0 m'/s) on basis of slope-area 
measurement of peak flow; minimum discharge, 5.1 ft'is (0.144 '/s), Apr. 8, 9, 1970. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,000 ft'is (113 m'/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft'/s) 
(0/s) 
(ft) (m) 
Date 
Time 
(ft'/s) 
(els) 
(ft) 
(m) 
Oct. 6 
1515 
5,850 
166 
8.57 2.612 
May 13 
0915 
8,160 
231 
9.56 2.914 
Oct. 24 
0515 
6,660 
139 
8.94 2.725 
Aug. 13 
2030 
*9,700 
275 
*10.12 3.084 
Nov. 15 
1515 
4,230 
120 
7.70 2.347 
Aug. 24 
1930 
4,620 
131 
7.93 2.417 
Minimum daily discharge, 9.0 ft'is (0.255 m'/s), Mar. 8. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
113 
57 
33 
35 
23 
10 
27 
314 
45 
30 
55 
108 
2 
115 
82 
34 
43 
37 
9.9 
17 
103 
28 
34 
32 
47 
3 
82 
56 
31 
61 
47 
9.6 
17 
73 
25 
35 
38 
34 
4 
59 
50 
33 
77 
141 
11 
43 
50 
23 
27 
29 
30 
5 
113 
80 
73 
38 
58 
11 
253 
42 
23 
37 
26 
35 
6 
1100 
49 
43 
32 
29 
11 
68 
46 
20 
44 
23 
42 
7 
340 
42 
35 
30 
28 
14 
35 
200 
19 
63 
28 
26 
8 
139 
40 
32 
30 
23 
10 
37 
61 
22 
34 
24 
25 
9 
92 
38 
46 
156 
21 
15 
29 
73 
50 
34 
22 
23 
10 
70 
37 
44 
53 
19 
13 
24 
75 
67 
31 
24 
23 
11 
58 
37 
46 
39 
19 
16 
22 
86 
27 
28 
66 
21 
12 
50 
130 
84 
33 
19 
13 
20 
43 
28 
42 
90 
20 
13 
48 
100 
43 
30 
18 
28 
19 
324 
59 
32 
675 
20 
14 
50 
110 
33 
29 
19 
31 
19 
207 
62 
32 
72 
20 
15 
41 
572 
56 
28 
18 
42 
19 
67 
74 
48 
80 
19 
16 
39 
156 
37 
31 
17 
26 
43 
48 
70 
31 
27 
18 
17 
35 
106 
36 
34 
18 
15 
23 
42 
47 
51 
26 
17 
18 
70 
109 
35 
30 
15 
13 
19 
192 
31 
44 
24 
18 
19 
94 
74 
45 
26 
84 
12 
19 
68 
61 
34 
22 
17 
20 
63 
87 
66 
28 
24 
12 
18 
43 
44 
29 
21 
18 
21 
48 
172 
58 
31 
14 
11 
82 
42 
39 
28 
20 
20 
22 
47 
64 
94 
26 
12 
10 
53 
65 
37 
24 
23 
19 
23 
342 
66 
60 
43 
12 
9.9 
43 
35 
33 
23 
66 
20 
24 
669 
59 
49 
44 
11 
11 
44 
31 
30 
35 
300 
16 
25 
157 
51 
38 
30 
11 
16 
37 
28 
28 
28 
73 
20 
26 
117 
43 
41 
25 
10 
14 
35 
25 
32 
29 
41 
24 
27 
95 
39 
32 
24 
10 
14 
60 
30 
69 
24 
34 
30 
28 
71 
35 
47 
23 
11 
189 
121 
26 
32 
26 
206 
19 
29 
98 
34 
33 
22 
158 
160 
97 
30 
135 
175 
25 
30 
65 
48 
30 
25 
33 
444 
32 
28 
140 
57 
24 
31 
82 
---
28 
26 
47 
---
179 
---
45 
44 
---
TOTAL 
4562 
2654 
1395 
1182 
768 
835.4 
1850 
2747 
1183 
1277 
2443 
798 
MEAN 
147 
88.5 
45.0 
38.1 
27.4 
26.9 
61.7 
88.6 
39.4 
41.2 
78.8 
26.6 
MAX 
1100 
572 
94 
156 
141 
189 
444 
324 
74 
140 
675 
108 
MIN 
35 
34 
28 
22 
10 
9.6 
17 
25 
19 
23 
20 
16 
CFSM 
21.4 
12.9 
6.54 
5.54 
3.98 
3.91 
8.97 
12.9 
5.73 
5.99 
11.5 
3.87 
IN. 
24.67 
14.35 
7.54 
6.39 
4.15 
4.52 
10.00 
14.85 
6.40 
6.90 
13.21 
4.31 
AC-FT 
9050 
5260 
2770 
2340 
1520 
1660 
3670 
5450 
2350 
2530 
4850 
1580 
CAL YR 1985 TOTAL 
19962.0 
MEAN 
54.7 
MAX 
1100 
MIN 
9.2 
CFSM 7.95 
IN. 107.93 
AC-FT 
39590 
WTR YR 1986 TOTAL 
21694.4 
MEAN 
59.4 
MAX 
1100 
MIN 
9.6 
CFSM 8.63 
IN. 117.30 
AC-FT 
43030 
198 
RIO MAMEYES BASIN 
50065500 RIO MAMEYES NEAR SABANA, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS JUNE 1983 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
STREAMFLOW, 
SPECIFIC CON-
TEMPERA­
DATE 
TIME 
INSTANTANEOUS 
DUCTANCE 
TURE 
DATE 
TIME 
INSTA4TANEOUS 
DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
JUN, 18 0949 
32 
93 
23.0 
AUG, 15 1036 
70 
77 
23.5 
JUL, 17 0952 
41 
90 
23.5 
SEP, 09 0944 
24 
108 
24.5 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
199 
RIO SABANA BASIN 
50067000 RIO SABANA AT SABANA, PR 
LOCATION.--Lat 18°19'52", long 65°43'52", Hydrologic Unit 21010005, on right bank along Highway 988, 0.3 mi 
(0.5 km) north of junction of Highways 988 and 983 in Sabana, and 3.3 mi (5.3 km) south of Luquillo. 
DRAINAGE AREA.--3.96 mil (10.26 km2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--Oc:ober 1979 to current year. 
GAGE.--Water-stage recorder and crest-stage gagee. Elevation of gage is 260 ft (80 m), from topographic map. 
REMARKS.--Estimated daily discharges: Nov. 2-13. Records fair except those for estimated daily discharges, 
which are poor. 
AVERAGE DISCHARGE.--7 years (1980-36), 18.3 ft3/s (0.518 m3/s), 62.76 in/yr (1,594 mm/yr), 13,260 acre-ft/yr 
(16.3 hm 3/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,010 ft'is (255 m'/s), Apr. 21, 1983, gage height, 19.35 ft 
.ixtended above 200 ft3/s (5.66 e/s) on basis of step-backwater 
analysis and slope-area measurement; minimum discharge, 0.86 ft3/s (0.024 10/s), Apr. 17, 1983. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft3/s (42.5 le/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft3/s) 
(m 3/s) 
(ft) (m) 
Date 
Time 
(ft3/s) 
(m 3/s) 
(ft) 
(m) 
Oct. 6 
1330 
2,200 
62.3 
13.19 4.020 
May 13 
0915 
*2,260 
64.0 
*13.27 4.045 
Oct. 24 
0445 
1,760 
49.8 
12.55 3.825 
Aug. 13 
1845 
2,000 
56.6 
12.90 3.932 
Nov. 15 
1515 
1,610 
45.6 
12.30 3.749 
Aug. 24 
1615 
1,710 
48.4 
12.46 3.798 
Minimum discharge, 1.3 ft'ils (0.037 e/s), Aug. 21, 22. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
(5.898 m), from flocdmark, from rating cur.e.
­
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
16 
21 
13 
6.2 
3.3 
3.3 
10 
92 
28 
4.5 
6.7 
79 
2 
22 
82 
12 
7.7 
4.9 
2.3 
4.2 
34 
18 
5.7 
4.6 
16 
3 
30 
33 
12 
6.6 
12 
2.1 
3.4 
45 
16 
5.4 
4.4 
9.9 
4 
11 
28 
11 
10 
30 
3.0 
3.3 
17 
14 
4.0 
4.8 
8.1 
5 
23 
26 
20 
6.4 
15 
2.9 
96 
11 
16 
10 
3.7 
20 
6 
713 
25 
13 
5.7 
6.1 
2.5 
14 
16 
12 
9.6 
3.9 
13 
7 
169 
22 
11 
5.3 
5.3 
4.4 
5.6 
160 
11 
8.9 
4.3 
7.9 
8 
49 
20 
10 
5.0 
4.0 
2.3 
6.1 
21 
9 8 
5.5 
3.5 
6.2 
9 
33 
19 
12 
29 
3.4 
3.7 
4.5 
21 
17 
3.7 
3.4 
5.6 
10 
27 
18 
11 
10 
3.2 
2.3 
3.2 
23 
17 
3.5 
5.0 
5.2 
11 
25 
46 
9.9 
6.3 
3.1 
2.7 
3.0 
25 
11 
3.3 
6.4 
4.7 
12 
21 
130 
16 
5.3 
3.0 
2.2 
2.8 
10 
9 9 
4.3 
9.8 
4.6 
13 
20 
115 
10 
5.0 
2.5 
2.7 
2.7 
190 
13 
3.1 
136 
4.3 
14 
20 
49 
8.7 
4.5 
3.5 
2.8 
2.6 
139 
16 
3.2 
76 
3.9 
15 
17 
353 
10 
4.6 
3.1 
2.9 
2.7 
26 
16 
5.6 
12 
3.6 
16 
16 
56 
8.7 
5.2 
2.5 
2.6 
5.0 
18 
24 
3.7 
5.2 
3.5 
17 
14 
35 
8.9 
4.4 
2.6 
2.9 
3.5 
15 
13 
5.2 
2.6 
3.2 
18 
29 
29 
8.4 
3.8 
2.7 
2.6 
2.5 
75 
8.4 
3.3 
2.0 
3.1 
19 
32 
26 
10 
3.7 
9.2 
2.6 
2.3 
22 
19 
2.5 
1.9 
2.9 
20 
19 
33 
15 
3.9 
4.3 
2.5 
2.2 
16 
9.1 
2.4 
1.7 
2.9 
21 
19 
57 
12 
5.7 
2.5 
2.5 
3.3 
17 
7.5 
2.9 
1.5 
3.3 
22 
14 
22 
19 
4.6 
2.4 
2.3 
3.1 
44 
6.7 
2.3 
1.5 
3.4 
23 
117 
21 
16 
7.4 
2.2 
2.3 
2.4 
13 
6.1 
2.3 
3.1 
3.1 
24 
350 
19 
11 
8.1 
2.1 
2.4 
2.7 
10 
6.0 
4.8 
117 
2.5 
25 
59 
19 
8.8 
5.0 
2.2 
3.5 
2.1 
9.0 
5.5 
3.4 
18 
3.1 
26 
33 
17 
9.5 
3.6 
2.1 
3.0 
2.0 
8.3 
6.3 
2.1 
5.9 
3.4 
27 
34 
16 
7.6 
3.1 
2.4 
2.8 
36 
26 
22 
2.0 
4.0 
5.7 
28 
25 
15 
9.0 
3.2 
3.7 
66 
76 
21 
5.9 
2.8 
156 
4.3 
29 
48 
14 
7.3 
2.9 
---
49 
171 
91 
5.1 
11 
143 
4.3 
30 
26 
17 
6.6 
3,7 
7.2 
195 
21 
4.9 
36 
19 
3.1 
31 
26 
---
6.2 
3.7 
22 
---
143 
---
14 
13 
---
TOTAL 
2057 
1385 
343.6 
189.6 
143.3 
218.3 
673.2 
1379.3 
374.2 
181.0 
780.4 
243.8 
MEAN 
66.4 
46.2 
11.1 
6.12 
5.12 
7.04 
22.4 
44.5 
12.5 
5.84 
25.2 
8.13 
MAX 
713 
353 
20 
29 
30 
66 
195 
190 
28 
36 
156 
79 
MIN 
11 
14 
6.2 
2.9 
2.1 
2.1 
2.0 
8.3 
4.9 
2.0 
1.5 
2.5 
CFSM 
16.8 
11.7 
2.80 
1.55 
1.29 
1.78 
5.66 
11.2 
3.16 
1.47 
6.36 
2.05 
IN. 
19.32 
13.01 
3.23 
1.78 
1.35 
2.05 
6.32 
12.96 
3.52 
1.70 
7.33 
2.29 
AC-FT 
4080 
2750 
682 
376 
284 
433 
1340 
2740 
742 
359 
1550 
484 
CAL YR 1985 TOTAL 7466.9 
MEAN 
20.5 
MAX 
713 
MIN 
1.2 
CFSM 5.18 
IN. 
70.14 
AC-FT 
14810 
WTR YR 1986 TOTAL 7968.7 
MEAN 
21.8 
MAX 
713 
MIN 
1.5 
CFSM 5.51 
IN. 
74.86 
AC-FT 
15810 
 
200 
RIO SABANA BASIN 
50067000 RIO SABANA AT SABANA, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
DATE 
TIME INSTANTANEOUS 
DUCTANCE 
TURE 
DATE 
TIME INSTANTANEOUS 
DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
JUN, 18 1244 
8.2 
105 
26.0 
AUG, 15 1312 
10 
87 
26.0 
JUL, 17 1247 
6.0 
118 
26.5 
SEP. 09 1214 
5.4 
118 
26.5 
I
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201 
RIO FAJARDO BASIN 
50071000 RIO FAJARDO NEAR FAJARDO, PR 
LOCATION.--Lat 18°17'56", long 65°41'42", Hydrologic Unit 21010005, on left bank off Highway 976, 0.1 mi (0.2 km) 
upstream from Highway 977 bridge, 0.3 mi (0.5 km) downstream from Quebrada Penon, 1.1 mi (1.8 km) northeast of 
Colonia Paraiso, and 3.3 mi (5.3 km) southwest of Fajardo. 
DRAINAGE AREA.--14.9 
i 2 (38.6 km 2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--1960-61 (occasional low and peak-flow measurements only), March 1961 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 137.60 ft (41.940 m) above mean sea level. Due to flood damage, 
gage datum has had changes as follows: Mar. 24, 1961 to May 5, 1969, 138.95 ft (42.352 m); May 6, 1969 to 
Mar. 16, 1972. 135.05 ft (41.163 m); Mar. 17, 1972 to Mar 25, 1975, 138.60 ft (42.245 m). 
REMARKS.--Estimated daily discharges: July 23 to Aug. 4. Records fair, except those for estimated daily discharges 
which are poor. Low flow affected by diversions for water supply about 400 m upstream from gaging station (esti­
mated mean daily discharge is 9.0 ft'is (0.255 m 3/s). 
AVERAGE DISCHARGE.--25 years (1962-86), 67.7 ft'is (1.917 m'/s), 61.70 in/yr (1,567 mm/yr), 49,050 acre-ft/yr 
(60.5 hie/yr); median of yearly mean discharges, 68 ftYs (1.32 m 3/s), 49,300 acre-ft/yr (61 hmYyr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 19,600 ft'is (555 '/s), Oct. 24, 1974, gage height, 
13.62 ft (4.151 ), datum then in use, from rating curve extended above 100 ft'/s (2.83 10/s) on basis of 
step-backwater analyses and slope-area measurements of peak discharges; minimum discharge, 0.86 ftqs 
(0.024 leis), May 3, 1984. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,500 ft'is (99.1 m 3/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft'/s) 
(e/s) 
(ft) 
(m) 
Date 
Time 
(W/s) 
(10/s) 
(ft) 
(m) 
Oct. 6 
1530 
6,760 
191 
10.41 3.173 
May 13 
0945 
*7,900 
224 
*11.15 3.398 
May 
7 
0330 
3,860 
109 
8.17 2.490 
Minimum discharge, 4.1 ft'is (0.110 10/s), Apr. 26, 27. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
57 
102 
42 
34 
22 
6.6 
13 
338 
64 
16 
32 
188 
2 
227 
217 
42 
46 
29 
5.8 
8.7 
131 
41 
15 
24 
43 
3 
146 
74 
37 
41 
26 
5.6 
7.3 
84 
34 
18 
23 
30 
4 
66 
61 
34 
66 
292 
5.9 
22 
32 
31 
17 
25 
27 
5 
76 
57 
85 
32 
74 
6.5 
272 
19 
31 
19 
17 
48 
6 
2120 
54 
45 
27 
31 
6.2 
60 
48 
25 
36 
16 
97 
7 
555 
47 
37 
23 
25 
11 
19 
488 
25 
31 
16 
30 
8 
165 
42 
35 
22 
21 
6.4 
21 
69 
24 
23 
16 
24 
9 
86 
39 
49 
217 
18 
8.6 
15 
190 
35 
16 
15 
21 
10 
57 
37 
50 
48 
17 
7.4 
11 
166 
47 
15 
16 
19 
11 
47 
123 
42 
32 
18 
7.6 
12 
162 
30 
14 
47 
17 
12 
38 
354 
50 
26 
14 
8.2 
7.5 
49 
45 
19 
39 
16 
13 
30 
418 
38 
24 
15 
25 
7.1 
575 
48 
15 
184 
16 
14 
26 
292 
31 
22 
13 
39 
6.2 
374 
38 
16 
70 
15 
15 
23 
911 
45 
21 
12 
55 
5.6 
44 
65 
62 
50 
15 
16 
20 
246 
37 
29 
10 
17 
8.3 
29 
50 
26 
25 
14 
17 
21 
171 
41 
26 
13 
9.8 
9.5 
24 
49 
34 
18 
13 
18 
287 
153 
35 
20 
13 
7.3 
5.6 
376 
26 
21 
15 
12 
19 
58 
125 
40 
19 
18 
6.6 
4.6 
70 
31 
18 
14 
12 
20 
32 
124 
50 
20 
20 
7.0 
4.4 
32 
25 
17 
13 
11 
21 
48 
185 
49 
26 
9.7 
6.2 
8.9 
32 
23 
18 
13 
11 
22 
41 
83 
74 
21 
8.5 
5.2 
11 
32 
21 
15 
16 
12 
23 
428 
82 
50 
36 
7.5 
4.7 
6.7 
23 
18 
15 
24 
17 
24 
945 
75 
40 
56 
7.1 
4.6 
11 
21 
18 
25 
241 
14 
25 
222 
62 
31 
31 
7.7 
7.9 
6.0 
19 
18 
20 
62 
11 
26 
209 
55 
37 
20 
7.2 
11 
4.4 
19 
17 
15 
23 
13 
27 
162 
50 
27 
17 
6.6 
14 
33 
24 
52 
14 
17 
19 
28 
110 
47 
36 
16 
7.4 
23 
156 
22 
19 
17 
337 
24 
29 
192 
43 
27 
16 
---
62 
504 
136 
18 
47 
481 
14 
30 
97 
62 
24 
21 
18 
360 
32 
16 
136 
72 
23 
31 
106 
---
22 
28 
20 
---
421 
---
58 
45 
---
TOTAL 
6697 
4391 
1282 
1083 
762.7 
429.1 
1620.8 
4081 
985 
828 
2006 
826 
MEAN 
216 
146 
41.4 
34.9 
27.2 
13.8 
54.0 
132 
32.8 
26.7 
64.7 
27.5 
MAX 
2120 
911 
85 
217 
292 
62 
504 
575 
65 
136 
481 
188 
MIN 
20 
37 
22 
16 
6.6 
4.6 
4.4 
19 
16 
14 
13 
11 
CFSM 
14.5 
9.80 
2.78 
2.34 
1.83 
.93 
3.62 
8.86 
2.20 
1.79 
4.34 
1.85 
IN. 
16.72 
10.96 
3.20 
2.70 
1.90 
1.07 
4.05 
10.19 
2.46 
2.07 
5.01 
2.06 
AC-FT 
13280 
8710 
2540 
2150 
1510 
851 
3210 
8090 
1950 
1640 
3980 
1640 
CAL YR 1985 TOTAL 
24980.7 
MEAN 
68.4 
MAX 
2120 
MIN 
4.3 
CFSM 4.59 
IN. 
62.37 
AC-FT 
49550 
WTR YR 1986 TOTAL 
24991.6 
MEAN 
68.5 
MAX 
2120 
MIN 
4.4 
CFSM 4.60 
IN. 
62.40 
AC-FT 
49570 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
RIO FAJARDO BASIN 
50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1960 to current year. 
PERIOD OF GAILY RECORD.-- 
SUSPENDED-SEDIMENT DISCHARGE: October 1982 to current year. 
INSTRUMENTATION.--USD-49 Sediment sampler since February 1983. 
REMARKS.--Sediment samples were collected by a local observer once daily during low flow and more than 
once daily during high flow events for concentration and particle size analyses. Sediment samples were 
also collected periodically by survey staff. 
EXTREMES FOR PERIOD OF DAILY RECORD.-- 
SEDIMENT CONCENTRATIONS: Maximum daily mean, 2,210 mg/L October 6, 1985; Minimum daily mean, 2.0 mg/L 
several days. 
SEDIMENT LOADS: Maximum daily, 22,100 tons (20,000 tonnes) October 6, 1985; minimum daily, 0.02 tons 
(0.02 tonne) March 24, 1986. 
EXTREMES FOR CURRENT YEAR.-- 
SEDIMENT CONCENTRATIONS: Maximum daily mean, 2,210 mg/L October 6, 1985; Minimum daily mean, 2.0 mg/L 
several days. 
SEDIMENT LOADS: Maximum daily, 22,100 tons (20,000 tonnes) October 6, 1985; minimum daily, 0.02 tons 
(0.02 tonne) March 24, 1986. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLT- STREP- 
SPE- 
DiS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
23... 
1215 
102 
96 
7.40 
24.5 
24 
8.8 
2300 
4800 
DEC 
03... 
1310 
35 
128 
8.20 
25.5 
3.4 
<10 
360 
160 
FEB 1986 
11... 
1240 
26 
133 
7.90 
24.0 
3.0 
9.6 
14 
54 
K32 
APR 
14... 
1230 
6.7 
143 
8.20 
27.0 
2.4 
9.7 
123 
25 
K140 
K14 
JUL 
02... 
1100 
15 
127 
8.60 
28.0 
2.5 
9.9 
127 
15 
80 
K1400 
SEP 
2... 
1150 
42 
94 
7.05 
25.5 
8.9 
8.5 
105 
11 
K1000 
600 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD- 
SIUM, WATER 
SULFATE RiDE, 
NESS WATER DIS- CIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
23... 
20 
0 
4.4 
2.3 
7.4 
0.7 
1.2 
21 
<.05 
7.1 
9.0 
DEC 
3... 
39 
FEB 1986 
11... 
34 
APR 
14... 
36 
0 
7.7 
4.1 
12 
0.9 
1.2 
43 
<0.5 
5.4 
15 
JUL 
02... 
41 
SEP 
02... 
24 
0 
5.1 
2.7 
8.7 
0.8 
1.2 
25 
8.6 
8.7 
K = non-ideal count 
202 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
  
 
 
 
 
  
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
  
 
 
  
 
  
RIO FAJARDO BASIN 
50071000 RIO FAJARDO NEAR FAJARDC, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL. TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
5102) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
23... 
<0.10 
16 
60 
17 
20 
0.190 
0.010 
0.200 
0.570 
0.0 
DEC 
03... 
1 
<0.010 
0.200 
0.020 
0.18 
FEB 1986 
11... 
1 
APR 
14... 
<0.10 
26 
97 
1.8 
6 
<0.010 
0.100 
0.030 
0.47 
JUL 
02... 
9 
<0.010 <0.100 0.040 0.26 
SEP 
2... 
<0.10 
20 
70 
7.9 
8 
<0.010 
0.200 
0.060 
0.14 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, 
BORON, CADMIUM 
MIUM, " COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
.TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) AS P) 
AS AS) 
AS BA) 
AS B) 
AS CO) 
AS CR) 
AS CU) 
OCT .1985 
23... 
0.40 
0.60 
2.7 
0.040 
<1 
<100 
30 
1 
9 
10 
DEC 
3... 
0.20 
0.40 
1.8 
0.020 
FEB 1986 
11... 
APR 
14... 
0.50 
0.60 
2.7 
0.020 
<1 
<100 
<10 
2 
10 
30 
JUL 
02... 
0.30 
0.020 
SEP 
02... 
0.20 
0.40 
1.8 
0.020 
-- 
MANGA- 
METHY- 
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
tENE 
TOTAL TOTAL TOTAL TOTAL .SELE- TOTAL TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
23... 
1900 
5 
50 <0.10 
<1 
<1 
80 <0.010 
4 0.05 
DEC 
03. 
FEB 1986 
11...
--
APR 
14... 
340 
1 
30 <0.10 
<1 
<1 
30 <0.010 
2 0.04 
JUL 
02...
-- 
SEP 
02... 
203 
 
 
         
         
 
 
 
        
 
  
    
        
        
204 
RIO FAJARDO BASIN 
50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
PESTICIDE ANALYSES 
CHLOR-
DI-
DI-
PCB, ALDRIN, DANE, ODD, DDE, DDT, AZINON, ELDRIN 
DATE 
TIME 
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
02... 
1100 
<0.1 
<0.01 
<0.1 
<0.01 
<0.01 
<0.01 
<0.01 
<0.01 
HEPTA-
METH-
ENDO-
HEPTA- CHLOR 
MALA- OXY-
SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, 
DATE 
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
02... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 
NAPH-
THA-
METHYL METHYL 
LENES, 
PARA-
TRI-
PARA-
POLY-
PER-
TOX-
TRI-
THION, THION, MIREX, THION, CHLOR. THANE APHENE, THION 
DATE 
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
02... 
<0.01 
<0.01 
<0.01 
<0.01 
<0.1 
<0.1 
<1 
<0.01 
205 
RIO FAJARDO BASIN 
50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued 
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
MEAN 
MEAN 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DAY 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
OCTOBER 
NOVEMBER 
DECEMBER 
1 
57 
21 
5.5 
102 
58 
36 
42 
20 
2.4 
2 
227 
134 
170 
217 
176 
353 
42 
19 
2.2 
3 
146 
107 
77 
74 
37 
7.6 
37 
17 
1.6 
4 
66 
13 
2.4 
61 
29 
4.8 
34 
16 
1.4 
5 
76 
25 
5.9 
57 
27 
4.1 
85 
63 
34 
6 
2120 
2210 
22100 
54 
26 
4.0 
45 
23 
3.0 
7 
555 
346 
857 
47 
21 
2.7 
37 
17 
1.7 
8 
165 
90 
42 
42 
18 
2.0 
35 
18 
1.9 
9 
86 
44 
11 
39 
13 
1.4 
49 
24 
3.8 
10 
57 
27 
4.2 
37 
10 
1.0 
50 
25 
3.8 
11 
47 
22 
2.8 
123 
95 
154 
42 
19 
2.6 
12 
38 
17 
1.7 
354 
301 
538 
50 
16 
2.5 
13 
30 
14 
1.1 
418 
291 
1020 
38 
6 
.63 
14 
26 
12 
.84 
292 
240 
409 
31 
4 
.33 
15 
23 
11 
.68 
911 
865 
4170 
45 
22 
3.2 
16 
20 
9 
.49 
246 
171 
147 
37 
17 
1.8 
17 
21 
9 
.51 
171 
101 
51 
41 
20 
2.4 
18 
287 
415 
3260 
153 
102 
54 
35 
17 
1.7 
19 
58 
27 
6.7 
125 
72 
29 
40 
19 
2.2 
20 
32 
15 
1.3 
124 
71 
26 
50 
25 
4.1 
21 
48 
25 
4.4 
185 
143 
182 
49 
26 
5.8 
22 
41 
39 
53 
83 
41 
9.2 
74 
33 
7.9 
23 
428 
394 
1530 
82 
41 
9.4 
50 
26 
4.1 
24 
945 
851 
3710 
75 
37 
7.7 
40 
21 
2.5 
25 
222 
155 
148 
62 
30 
5.0 
31 
11 
.93 
26 
209 
145 
157 
55 
27 
4.0 
37 
19 
2.2 
27 
162 
91 
56 
50 
24 
3.2 
27 
13 
.95 
28 
110 
60 
20 
47 
21 
2.6 
36 
17 
1.9 
29 
192 
132 
115 
43 
20 
2.4 
27 
14 
1.0 
30 
97 
52 
15 
62 
32 
6.8 
24 
12 
.79 
31 
106 
64 
26 
---
---
---
22 
11 
.73 
TOTAL 
6697 
32385.52 
4391 
7246.9 
1282 
106.06 
206 
RIO FAJARDO BASIN 
50071000 RIO FAJARDO NEAR FAJARDO. PR--Continued 
SEDIMENT DISCHARGE. SUSPENDED (TONS/DAY). WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
MEAN 
MEAN 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DIcC14ARGE 
TRATION 
DISCHARGE 
DAY 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
tCFS) 
(MG/L) 
(TONS/DAY) 
JANUARY 
FEBRUARY 
MARCH 
1 
34 
19 
2.7 
22 
10 
.67 
6.6 
8 
.14 
2 
46 
20 
3.8 
29 
15 
1.7 
5.8 
5 
.08 
3 
41 
27 
7.1 
26 
15 
2.1 
5.6 
5 
.08 
4 
66 
37 
10 
292 
302 
794 
5.9 
8 
.14 
5 
32 
15 
1.3 
74 
41 
14 
6.5 
8 
.13 
6 
27 
10 
.73 
31 
14 
1.1 
6.2 
7 
.17 
7 
23 
10 
.62 
25 
11 
.74 
11 
10 
.37 
8 
22 
10 
.59 
21 
10 
.57 
6.4 
5 
.09 
9 
217 
180 
384 
18 
8 
.39 
8.6 
12 
.41 
10 
48 
33 
5.3 
17. 
8 
.37 
7.4 
4 
.08 
11 
32 
14 
1.2 
18 
10 
.48 
7.6 
3 
.05 
12 
26 
12 
.84 
14 
6 
.23 
8.2 
4 
.08 
13 
24 
11 
.71 
15 
9 
.52 
25 
13 
1.7 
14 
22 
9 
.53 
13 
5 
.18 
39 
22 
4.0 
15 
21 
9 
.51 
12 
7 
.23 
55 
26 
8.9 
16 
29 
13 
1.2 
10 
7 
.19 
17 
8 
.43 
17 
26 
13 
.94 
13 
7 
.25 
9.8 
5 
.14 
18 
20 
9 
.49 
13 
6 
.21 
7.3 
4 
.08 
19 
19 
8 
.41 
18 
9 
.74 
6.6 
3 
.05 
20 
20 
6 
.32 
20 
13 
1.1 
7.0 
4 
.08 
21 
26 
11 
.85 
9.7 
7 
.18 
6.2 
3 
.05 
22 
21 
.11 
.68 
8.5 
5 
.11 
5.2 
2 
.03 
23 
36 
16 
1.7 
7.5 
5 
.10 
4.7 
2 
.03 
24 
56 
22 
4.3 
7.1 
5 
.10 
4.6 
2 
.02 
25 
31 
14 
1.4 
7.7 
5 
.10 
7.9 
5 
.13 
26 
20 
9 
.49 
7.2 
4 
.08 
11 
6 
.36 
27 
17 
6 
.28 
6.6 
8 
.14 
14 
10 
.56 
28 
16 
6 
.26 
7.4 
9 
.22 
23 
19 
4.1 
29 
16 
6 
.26 
---
---
62 
35 
11 
30 
21 
10 
.44 
---
18 
7 
.46 
31 
28 
13 
1.1 
20 
10 
.72 
TOTAL 
1083 
435.05 
762.7 
820.80 
429.1 
34.66 
207 
RIO FAJARDO BASIN 
50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued 
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
MEAN 
MEAN 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DAY 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
APRIL 
MAY 
JUNE 
1 
13 
6 
.23 
338 
277 
1050 
64 
26 
6.3 
2 
8.7 
5 
.17 
131 
111 
130 
41 
13 
1.4 
3 
7.3 
5 
.13 
84 
71 
101 
34 
15 
1.3 
4 
22 
15 
4.2 
32 
19 
2.2 
31 
14 
1.2 
5 
272 
236 
643 
19 
14 
.85 
31 
10 
.84 
6 
60 
43 
25 
48 
36 
47 
26 
10 
.70 
7 
19 
7 
.36 
488 
468 
1050 
25 
11 
.74 
8 
21 
10 
.81 
69 
36 
9.1 
24 
11 
.71 
9 
15 
7 
.32 
190 
197 
640 
35 
31 
4.1 
10 
11 
5 
.16 
166 
286 
383 
47 
31 
6.5 
11 
12 
5 
.16 
162 
122 
105 
30 
14 
1.2 
12 
7.5 
4 
.08 
49 
24 
3.4 
45 
27 
4.1 
13 
7.1 
3 
.06 
575 
517 
5890 
48 
28 
6.1 
14 
6.2 
3 
.05 
374 
295 
1030 
38 
21 
2.7 
15 
5.6 
3 
.04 
44 
21 
2.6 
65 
38 
11 
16 
8.3 
5 
.14 
29 
13 
1.0 
50 
29 
5.7 
17 
9.5 
8 
.22 
24 
7 
.51 
49 
37 
10 
18 
5.6 
5 
.08 
376 
354 
1230 
26 
11 
.78 
19 
4.6 
3 
.04 
70 
43 
15 
31 
19 
2.0 
20 
4.4 
3 
.04 
32 
15 
1.3 
25 
14 
.94 
21 
8.9 
5 
.14 
32 
17 
1.9 
23 
10 
.64 
22 
11 
5 
.17 
32 
17 
2.0 
21 
9 
.54 
23 
6.7 
3 
.06 
23 
11 
.68 
18 
7 
.34 
24 
11 
17 
.74 
21 
10 
.57 
18 
7 
.34 
25 
6.0 
5 
.08 
19 
8 
.41 
18 
8 
.39 
26 
4.4 
5 
.06 
19. 
8 
.41 
17 
9 
.52 
27 
33 
19 
5.6 
24 
12 
1.1 
52 
34 
19 
28 
156 
128 
278 
22 
12 
.76 
19 
5 
.26 
29 
504 
558 
2040 
136 
109 
239 
18 
4 
.19 
30 
360 
445 
1290 
32 
21 
2.0 
16 
3 
.13 
31 
---
---
---
421 
321 
1290 
---
---
TOTAL 
1620.8 
4290.14 
4081 
13230.79 
985 
90.66 
208 
RIO FAJARDO BASIN 
50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued 
SEDIMENT DISCHARGE. SUSPENDED (TONS/DAY). WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
MEAN 
MEAN 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DAY 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
kCFS) 
(MG/L) 
(TONS/DAY) 
JULY 
AUGUST 
SEPTEMBER 
1 
16 
3 
.13 
32 
20 
1.7 
188 
117 
384 
2 
15 
6 
.24 
24 
11 
.71 
43 
12 
1.7 
3 
18 
8 
.39 
23 
10 
.62 
30 
9 
.73 
4 
17 
10 
.46 
25 
11 
.74 
27 
9 
.65 
5 
19 
9 
.62 
17 
8 
.37 
48 
27 
6.6 
6 
36 
19 
2.5 
16 
6 
.26 
97 
67 
40 
7 
31 
16 
1.5 
16 
3 
.13 
30 
14 
1.1 
8 
23 
11 
.85 
16 
2 
.09 
24 
11 
.71 
9 
16 
8 
.35 
15 
4 
.16 
21 
14 
.79 
10 
15 
6 
.24 
16 
8 
.35 
19 
13 
.67 
11 
14 
7 
.26 
47 
31 
19 
17• 
11 
.50 
12 
19 
11 
.67 
39 
33 
12 
16 
10 
.43 
13 
15 
9 
.36 
184 
178 
552 
16 
9 
.39 
14 
16 
9 
.42 
70 
43 
15 
15 
7 
.28 
15 
62 
32 
7.9 
50 
28 
7.0 
15 
6 
.24 
16 
26 
17 
1.2 
25 
9 
.58 
14 
7 
.26 
17 
34 
20 
1.9 
18 
6 
.29 
13 
9 
.32 
18 
21 
10 
.58 
15 
5 
.20 
12 
9 
.29 
19 
18 
8 
.39 
14 
3 
.11 
12 
9 
.29 
20 
17 
7 
.32 
13 
2 
.07 
11 
9 
.27 
21 
18 
7 
.34 
13 
2 
.07 
11 
8 
.24 
22 
15 
7 
.28 
16 
5 
.25 
12 
5 
.16 
23 
15 
7 
.28 
24 
13 
2.4 
17 
7 
.32 
24 
25 
4 
.16 
241 
179 
278 
14 
6 
.23 
25 
20 
10 
.54 
62 
51 
27 
11 
5 
.15 
26 
15 
7 
.28 
23 
11 
.67 
13 
5 
.18 
27 
14 
6 
.23 
17 
7 
.33 
19 
8 
.41 
28 
17 
8 
.37 
337 
268 
884 
24 
13 
1.3 
29 
47 
46 
67 
481 
396 
1330 
14 
6 
.23 
30 
136 
10 
1.4 
72 
24 
7.6 
23 
12 
1.6 
31 
58 
24 
3.8 
45 
13 
1.9 
---
---
---
TOTAL 
828 
95.96 
2006 
3143.60 
826 
445.04 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO FAJARDO BASIN 
50072500 RIO FAJARDO BELOW FAJARDO, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°19'35", long 65°38'47m, 1.2 mi (1.9 km) southwest of Playa de Fajardo, and 0.5 mi (0.8 km) 
east of Fajardo plaza. 
DRAINAGE AREA.--23.4 sq mi (60.6 sq km). 
PERIOD OF RECORD.--Water years 1974 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
1NSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
30... 
1130 
91 
150 
6.70 
26.5 1900 
15 
5700 
5700 
DEC 
03... 
1620 
45 
180 
7.80 
26.5 
4.5 
<10 
26000 
4500 
FEB 1986 
11... 
1545 26 
184 7.80 26.5 2.3 
6.0 
35 K20000 4200 
MAY 
06... 
1230 154 
155 7.00 26.5 330 
6.6 
83 
50 K80000 80000 
JUL 
02... 
1425 
24 
172 
7.70 
31.0 
3.0 
8.7 
117 
<10 
K120 
K80 
SEP 
02... 
1410 
77 
136 
7.25 
28.0 
17 
8.0 
103 
<10 
26000 
8500 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD- 
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG)• AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
30... 
38 
3 
8.5 
4.0 
10 
0.7 
1.8 
35 
<0.5 
8.2 
16 
DEC 
03... 
48 
FEB 1986 
11... 
44 
MAY 
06... 
34 
0 
8.2 
3.4 
11 
0.8 
2.3 
35 
<O.5 
9.6 
18 
JUL 
02... 
39 
SEP 
02... 
35 
2 
8.7 
3.3 
12 
0.9 
1.6 
33 
10 
12 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
30... 
0.10 
21 
91 
22 
16 
0.360 
0.040 
0.400 
0.130 
0.57 
DEC 
03... 
1 
<0.010 
0.100 
0.140 
0.16 
FEB 1986 
11... 
1 
MAY 
06... 
<0.10 
17 
90 
38 
412 
0.440 
0.060 
0.500 
0.130 
0.77 
JUL 
02... 
22 
<0.010 <0.100 0.060 0.24 
SEP 
02... 
0.10 
18 
85 
18 
14 
0.190 
0.010 
0.200 
0.150 
0.35 
K = non-ideal count 
209 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
  
 
  
RIO FAJARDO BASIN 
50072500 RIO FAJARDO BELOW FAJARDO, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMiJM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS. 
 N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
30... 
0.70 
1.1 
4.9 
0.130 
<1 
100 
50 
<1 
11 
30 
DEC 
03... 
0.30 
0.40 
1.8 
0.040 
FEB 1986 
11...
-- 
MAY 
06... 
0.90 
1.4 
6.2 
0.110 
1 
100 
30 
<1 
5 
30 
JUL 
02... 
0.30 
0.030 
SEP 
2... 
0.50 
0.70 
3.1 
0.060 
MANGA- 
METHY- 
IRON, 
LEAD, 
NESE. 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
30... 
7600 
1 
300 
0.20 
<1 
<1 
40 
<0.010 
<1 
0.04 
DEC 
3... 
FEB 1986 
11...
-- 
MAY 
06... 
10000 
4 350 <0.10 
1 
<1 
40 <0.010 
<1 0.10 
JUL 
02... 
SEP 
02... 
210 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
   
211 
RIO BLANCO BASIN 
50075000 RIO ICACOS NEAR NAGUABO, PR 
LOCATION.--Lat 18°16'38", long 65°47'09", Hydrologic Unit 21010001, in Caribbean National Forest, off Highway 191, 
at El Yunque, 1.6 mi (2.6 km) upstream from confluence with Rio Cubuy, 2.8 mi (4.5 km) north of Florida, and 
5.3 mi (8.5 km) northwest of Naguabo Plaza. 
DRAINAGE AREA.--1.26 mi' (3.26 ka2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--July 1945 to March 1953 (operated by Puerto Rico Water Resources Authority), annual maximum, 
water years 1953-62, annual low-flow measurements 1962-66, October 1979 to current year. 
GAGE.--Water-stage recorder, crest-stage gage and sharp-crested weir. Elevation of gage is 2,020 ft (616 m), 
from topographic man. 
REMARKS.--No estimated daily discharges during water year. Records poor. 
AVERAGE DISCHARGE.--14 years (1946-52, 1980-86), 15.1 ft'is (0.428 e/s), 162.74 in/yr (4,134 mm/yr), 
10,940 acre-ft/yr (13.5 hm 3/yr); median of yearly mean discharges, 14 ft'/s (0.40 10/s), 10,100 acre-ft/yr 
(12 hmYyr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,860 ft3/s (81.0 m'/s), Apr. 21, 1983, gage height, 8.96 ft 
(2.731 m), from rating curve extended above 30 ft'is (0.850 m'/s) on basis of step-backwater analysis; minimum 
daily discharge, 1.5 ft3/s (0.042 m'/s), Mar. 22, Apr. 10, 1946. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 650 ft'is (18.4 03/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft3/s) 
(m 3/s) 
(ft) 
(m) 
Date 
Time 
(ft3/s) 
(m 3/s) 
(ft) 
(m) 
Oct. 24 
0630 
756 
21.4 
5.60 1.707 
May 13 
0845 
*859 
24.3 
*5.86 1.786 
Apr. 5 
1445 
827 
23.4 
5.78 1.762 
Minimum discharge, 3.9 ft3/s (0.110 e/s), Apr. 27. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
13 
16 
13 
10 
6.5 
4.8 
7.6 
31 
8.6 
6.5 
7.9 
24 
2 
37 
20 
13 
10 
10 
4.8 
6.9 
11 
7.0 
6.4 
6.6 
8.6 
3 
16 
14 
12 
20 
7.5 
4.8 
5.6 
7.4 
6.6 
6.8 
6.9 
7.6 
4 
14 
15 
11 
15 
40 
5.8 
11 
7.3 
6.3 
5.6 
6.4 
7.1 
5 
24 
14 
19 
9.6 
11 
5.0 
107 
6.9 
6.0 
9.9 
5.8 
7.0 
6 
239 
13 
12 
8.3 
8.3 
4.9 
12 
15 
5.9 
14 
5.5 
11 
7 
62 
12 
11 
7.9 
7.5 
4.9 
7.2 
34 
6.3 
8.7 
6.2 
7.1 
8 
22 
12 
16 
7.9 
6.7 
4.6 
11 
9.0 
7.6 
6.4 
5.7 
6.6 
9 
18 
12 
13 
38 
6.4 
6.1 
7.5 
24 
9.4 
5.8 
5.2 
6.4 
10 
16 
12 
14 
10 
6.1 
4.9 
6.2 
20 
12 
5.4 
5.2 
6.3 
11 
15 
41 
15 
10 
6.0 
6.4 
5.8 
16 
7.8 
5.7 
41 
6.1 
12 
14 
47 
20 
8.5 
5.8 
4.9 
5.6 
8.4 
10 
8.9 
9.2 
6.0 
13 
14 
68 
13 
7.9 
5.6 
14 
5.4 
76 
12 
5.5 
43 
5.9 
14 
14 
52 
11 
7.5 
5.7 
17 
5.2 
26 
11 
8.1 
13 
5.7 
15 
13 
100 
14 
7.5 
5.5 
18 
5.0 
9.6 
20 
14 
9.3 
5.6 
16 
12 
26 
11 
10 
5.3 
12 
5.0 
8.8 
12 
8.0 
8.6 
5.3 
17 
12 
20 
11 
9.2 
6.4 
9.1 
4.8 
9.6 
11 
9.6 
6.9 
5.1 
18 
28 
23 
11 
7.6 
5.5 
6.4 
4.8 
22 
8.3 
6.0 
6.0 
5.1 
19 
15 
19 
10 
7.7 
18 
5.8 
4.6 
14 
10 
5.6 
5.7 
4.9 
20 
14 
29 
15 
8.3 
7.1 
5.5 
4.5 
9.1 
8.6 
5.4 
5.5 
4.9 
21 
14 
41 
12 
9.3 
5.8 
5.2 
4.6 
8.9 
8.8 
5.3 
5.4 
5.0 
22 
23 
17 
17 
8.3 
5.5 
5.2 
4.5 
8.2 
7.6 
5.1 
7.2 
5.3 
23 
75 
20 
12 
9.8 
5.3 
4.9 
4.5 
7.7 
7.3 
4.9 
31 
6.3 
24 
129 
17 
11 
12 
5.2 
5.0 
4.4 
7.8 
7.0 
6.8 
64 
5.1 
25 
21 
16 
11 
7.8 
5.2 
5.2 
4.2 
7.4 
6.8 
5.0 
11 
5.6 
26 
31 
15 
11 
7.0 
5.1 
7.5 
4.2 
8.4 
7.9 
4.7 
7.6 
6.9 
27 
18 
14 
9.5 
6.7 
5.0 
5.7 
6.2 
9.9 
11 
5.0 
6.9 
6.9 
28 
16 
13 
12 
6.4 
5.0 
16 
14 
8.7 
7.2 
5.7 
69 
6.1 
29 
24 
13 
9.3 
6.4 
---
16 
50 
15 
6.8 
80 
52 
5.3 
30 
15 
16 
8.5 
7.1 
7.2 
56 
7.5 
6.5 
78 
9.9 
12 
31 
16 
---
8.2 
7.7 
11 
---
56 
---
11 
8.5 
---
TOTAL 
994 
747 
386.5 
309.4 
223.0 
238.6 
385.3 
510.6 
263.3 
363.8 
482.1 
210.8 
MEAN 
32.1 
24.9 
12.5 
9.98 
7.96 
7.70 
12.8 
16.5 
8.78 
11.7 
15.6 
7.03 
MAX 
239 
100 
20 
38 
40 
18 
107 
76 
20 
80 
69 
24 
MIN 
12 
12 
8.2 
6.4 
5.0 
4.6 
4.2 
6.9 
5.9 
4.7 
5.2 
4.9 
CFSM 
25.5 
19.8 
9.92 
7.92 
6.32 
6.11 
10.2 
13.1 
6.97 
9.29 
12.4 
5.58 
IN. 
29.35 
22.05 
11.41 
9.13 
6.58 
7.04 
11.38 
15.07 
7.77 
10.74 
14.23 
6.22 
AC-FT 
1970 
1480 
767 
614 
442 
473 
764 
1010 
522 
722 
956 
418 
CAL YR 1985 TOTAL 
5343.6 
MEAN 
14.6 
MAX 
239 
MIN 
3.7 
CFSM 11.6 
IN. 157.76 
AC-FT 
10600 
WTR YR 1986 TOTAL 
5114.4 
MEAN 
14.0 
MAX 
239 
MIN 
4.2 
CFSM 11.1 
IN. 151.00 
AC-FT 
10140 
212 
RIO BLANCO BASIN 
50075000 RIO ICACOS NEAR KAGUABO, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
STREAM1LOW, 
SPECIFIC CON-
TEMPERA-
DATE 
TIME INSTANTANEOUS 
DUCTANCE 
TURE 
DATE 
TIME INSTANTANEOUS 
DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
MAY, 15 1034 
9.8 
56 
20.5 
AUG, 18 1034 
6.2 
69 
21.0 
JUN, 19 0948 
8.3 
60 
20.5 
SEP, 10 1006 
6.4 
69 
21.0 
JUL, 16 1031 
6.5 
68 
21.0 
 
 
Rib Anton R131; basin 
HUMACAO 
AMU', •ARECiliO 
.idAYX1WE Z 
R,b Grande de LoiOO basin 
Rib de la Pinto basin 
Island 
vide 
096 64?fro, 
•0865 
Drainage boundary 
20 
Lopa 
Rib Salinas (Aligval basin 
Path/as 
G UAYA A 
18 
EXPLANATION 
ARROYO 
E920 SURFACE—WATER STATION AND NUMBER 
-0835 QUALITY—OF—WATER STATION AND NUMBER 
CARIBBEAN 
S E A 
• 31 
WELL AND WELL NUMBER 
5 KILOMETERS 
Figure 23.--Rio Guanajibo basin. 
 
 
         
 
    
 
     
        
  
       
        
 
 
   
 
 
 
           
 
 
 
 
  
 
         
           
         
          
 
 
           
 
          
 
 
 
     
         
 
 
          
         
          
 
     
 
     
          
 
     
          
214 
RIO HUMACAO BASIN 
50082000 RIO HUMACAO AT HIGHWAY 3 AT HUMACAO, PR 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1958-66, 1969 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLT- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
17... 
1645 
73 
157 
7.50 
28.0 
64 
7.6 
20 
43000 
25000 
DEC 
19... 
1055 
31 
264 
7.80 
27.0 10 
8.0 
20 K110000 39000 
FEB 1986 
19... 
1320 
20 
289 
7.20 
30.5 
2.7 
6.0 
34 270000 K200000 
APR 
22... 
0935 8.9 
332 7.60 28.0 1.8 
7.7 
99 
29 530000 110000 
JUL 
16... 
1125 23 
264 7.50 29.5 15 
8.0 106 
26 200000 7400 
SEP 
19... 
0950 
14 
294 
7.55 
28.0 
7.1 
7.9 
102 
40 
K11000 
2200 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD-
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
17... 
53 
0 
14 
4.4 
16 
1 
2.5 
53 
<0.5 
11 
17 
DEC 
19... 
69 
FEB 1986 
19... 
76 
APR 
22... 
100 
5 
28 
7.5 
30 
1 
2.5 
96 
<0.5 
14 
37 
JUL 
16... 
79 
SEP 
19... 
82 
0 
22 
6.5 
25 
1 
2.0 
85 
14 
31 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE N020403 AMMONIA ORGANIC 
SOLVED (MG/L D1S- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
S102) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
17... 
0.10 
31 
130 
25 
84 
0.760 
0.040 
0.800 
0.250 
0.85 
DEC 
19... 
3 
0.870 
0.030 
0.900 
0.730 
0.47 
FEB 1986 
19... 
11 
0.930 
0.070 
1.00 
0.620 
0.48 
APR 
22... 
0.20 
38 
210 
5.2 
1 
0.760 
0.040 
0.800 
1.30 
0.40 
JUL 
16... 
20 
0.680 
0.020 
0.700 
0.310 
0.29 
SEP 
19... 
0.10 
40 
190 
7.0 
7 
0.980 
0.020 
1.00 
0.250 
0.15 
K = non-ideal count 
 
 
    
    
 
          
         
          
    
    
          
   
    
  
 
       
  
   
 
          
        
 
   
 
  
   
 
215 
RIO HUMACAO BASIN 
50082000 RIO HUMACAO AT HIGHWAY 3 AT HUMACAO, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
17... 
1.1 
1.9 
8.4 
0.210 
<1 
100 
20 
3 
6 
10 
DEC 
19,.. 
1.2 
2.1 
9.3 
0.320 
FEB 1986 
19... 
1.1 
2.1 
9.3 
0.450 
APR 
22... 
1.7 
2.5 
11 
0.490 
<1 
100 
60 
<1 
13 
<10 
JUL 
16... 
0.60 
1.3 
5.8 
0.280 
SEP 
19... 
0.40 
1.4 
6.2 
0.270 
MANGA-
METHY-
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV-
RECOV-
RECOV- • RECOV-
NIUM, 
RECOV-
RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
17... 
4800 
3 270 <0.10 
<1 
<1 
50 <0.010 
3 0.09 
DEC 
19... 
--
FEB 1986 
19... 
-­
APR 
22... 
320 
1 160 0.10 
<1 
<1 
20 <0.010 
4 0.15 
JUL 
16... 
SEP 
19... 
I
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
  
 
 
 
 
 
 
   
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
 
 
 
 
 
  
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
 
 
 
 
 
  
 
 
RIO GUAYANES BASIN 
50083500 RIO GUAYANES AT YABUCOA, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18'03'331, long 65'54'03", at hridge on Highway 182, 1.4 i (2,2 km) west-northwest of Yabucoa 
plaza. 
DRAINAGE AREA.--17.2 sq mi (44.6 sq km). 
PERIOD OF RECORD.--Water years 1958-62, 1968-70, 1980 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEM3ER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
18... 
1145 84 
132 7.80 26.0 66 
19 K32000 6700 
DEC 
18... 
1045 
37 
170 
7.50 
23.5 
8.4 
K12000 
4600 
FEB 1986 
20... 
1030 64 
110 7.30 21.5 140 
10.0 
57 4800 2500 
APR 
25... 
1050 
19 
166 
7.40 
25.0 
5.0 
8.4 
102 
20 
560 
450 
JUL 
22... 
1215 
28 
155 
7.35 
28.0 
10 
8.1 
104 
13 
K1500 
680 
SEP 
22... 
1325 
34 
156 
7.50 
27.5 
10 
8.0 
102 
<10 
2000 
2700 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD- 
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP-. DIS- TOTAL SULFIDE DIS- OIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
18... 
37 
0 
9.3 
3.4 
12 
0.9 
1.3 
44 
<0.5 
8.6 
11 
DEC 
18... 
51 
FEB 1986 
20... 
27 
APR 
25... 
48 
0 
12 
4.5 
15 
1 
1.3 
59 
<0.5 
5.7 
10 
JUL 
22... 
57 
SEP 
22... 
44 
0 
11 
4.0 
14 
0.9 
1.4 
57 
6.1 
11 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
CEN, 
GEM, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS PO 
AS N) 
AS N) 
AS N) 
OCT 1985 
18... 
0.10 
32 
100 
24 
90 
0.380 
0.020 
0.400 
0.070 
0.23 
DEC 
18... 
<0.010 
0.500 
0.020 
0.18 
FEB 1986 
20... 
192 
0.460 
0.040 
0.500 
0.070 
0.83 
APR 
25... 
0.10 
38 
120 
6.4 
2 
<0.010 
0.200 
0.030 
0.27 
JUL 
22... 
14 
<0.010 
0.200 
0.050 
0.55 
SEP 
22... 
0.20 
36 
120 
11 
18 
<0.010 
0.200 
0.
• 060 
0.24 
K = non-ideal count 
216 
 
 
    
    
 
          
         
          
    
    
          
    
    
  
 
        
          
        
  
   
 
  
  
 
 
 
         
         
 
 
 
        
        
 
  
    
        
        
217 
RIO GUAYANES BASIN 
50083500 RIO GUAYANES AT YABUCOA, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
18... 
0.30 
0.70 
3.1 
0.090 
<1 
<100 
20 
1 
4 
10 
DEC 
18... 
0.20 
0.70 
3.1 
0.040 
FEB 1986 
20... 
0.90 
1.4 
6.2 
0.110 
--
APR 
25... 
0.30 
0.50 
2.2 
0.030 
<1 
100 
10 
<1 
5 
<10 
JUL 
22... 
0.60 
0.80 
3.5 
0.050 
--
SEP 
22... 
0.30 
0.50 
2.2 
0.060 
MANGA-
NETHY-
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
18... 
5300 
2 150 0.10 
<1 
<1 
40 <0.010 
2 0.05 
DEC 
18... 
FEB 1986 
20... 
--
APR 
25... 
850 
1 100 <0.10 
<1 
<1 <10 <0.010 
<1 0.02 
JUL 
22... 
--
SEP 
22... 
--
PESTICIDE ANALYSES 
CHLOR-
DI-
DI-
PCB, ALDRIN, DANE, ODD, DOE, DDT, AZINON, ELDRIN 
DATE 
TIME 
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
22... 
1215 
<0.1 
<0.01 
<0.1 
<0.01 
<0.01 
<0.01 
<0.01 
<0.01 
HEPTA-
METH-
ENDO-
HEPTA- CHLOR 
MALA- OXY-
SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, 
DATE 
DIS-
DIS-
DIS-
DIS-
DIS-
D1S-
DIS-
DIS-
SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1936 
22... 
<0.01 
<0.01 
<0.01 
<0.01 
<0.01 
<0.01 
<0.01 
<0.01 
NAPH-
THA-
METHYL METHYL 
LENES, 
PARA-
TRI-
PARA-
POLY-
PER-
TOX-
DIS-
THION, THION, MIREX, THION, CHLOR. THANE APHENE, SOLVE 
DATE 
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
TRI-
SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED THION 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
22... 
<0.01 
<0.01 
<0.01 
<0.01 
<0.1 
<0.1 
<10 
<0.01 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
  
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
  
 
 
RIO GUAYANES BASIN 
50086500 RIO GUAYANES ABOVE MOUTH AT PLAYA DE GUAYANES, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°03'45", long 65°49'42", at Dld railroad crossing, 0.2 mi (0.3 km) from mouth, 0.4 mi (0.6 km) 
west of Playa de Guayanes, and 3.5 mi (5.6 km) northeast of Yabucoa plaza. 
DRAINAGE AREA.--34.0 sq mi (88.1 sq km). 
PERIOD OF RECORD.--Water years 1974 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) (DEG C) (NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
31... 
1250 402 
132 7.10 28.0 120 
8.8 
33 3400 3900 
DEC 
18... 
1430 
88 
182 
7.70 
26.0 
13 
7.2 
<10 
K460 
K430 
FEB 1986 
20... 
1300 
100 
285 
7.60 
27.5 
21 
10.0 
49 
4400 
2800 
MAY 
08... 
1130 
77 
162 
7.60 
27.5 
18 
7.9 
101 
23 
3700 
2600 
JUL 
22... 
0955 
57 
201 
7.55 
27.5 
22 
7.4 
94 
14 
K790 
530 
SEP 
22... 
1055 
46 
197 
7.65 
27.0 
11 
8.7 
110 
29 
6000 
4900 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM SIUK, SODIUM, 
AD- 
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
31... 
56 
18 
16 
4.0 
10 
0.6 
2.4 
38 
<0.5 
9.9 
11 
DEC 
18... 
49 
FEB 1986 
20... 
79 
MAY 
08... 
37 
0 
9.5 
3.3 
13 
1 
3.1 
43 
<0.5 
9.2 
12 
JUL 
22... 
66 
SEP 
22... 
49 
0 
12 
4,6 
18 
1 
1.8 
66 
10 
15 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
31... 
<0.10 25 
100 110 
276 0.340 0.060 0.400 0.120 0.98 
DEC 
18... 
14 
<0.010 
0.500 
0.020 
0.28 
FEB 1986 
20... 
50 
0.560 
0.040 
0.600 
0.120 
0.58 
MAY 
08... 
<0.10 
28 
100 
22 
44 
0.290 
0.010 
0.300 
0.070 
0.53 
JUL 
22... 
26 
<0.010 
0.400 
0.030 
0.27 
SEP 
22... 
0.20 
35 
140 
17 
13 
<0.010 
0.200 
0.050 
0.15 
K = non-ideal count 
218 
 
 
    
    
 
          
         
          
    
    
          
    
     
  
 
        
          
        
  
   
 
  
   
 
-- 
219 
RIO GUAYANES BASIN 
50086500 RIO GUAYANES ABOVE MOUTH AT PLAYA DE GUAYANES, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
31... 
1.1 
1.5 
6.6 
0.180 
<1 
100 
50 
<1 
14 
30 
DEC 
18... 
0.30 
0.80 
3.5 
0.050 
FEB 1986 
20... 
0.70 
1.3 
5.8 
0.160 
MAY 
08... 
0.60 
0.90 
4.0 
0.170 
<1 
100 
50 
<1 
3 
10 
JUL 
22... 
0.30 
0.70 
3.1 
0.070 
SEP 
22... 
0.20 
0.40 
1.8 
0.070 
--
MANGA-
METHY-
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
31... 
13000 
2 500 <0.10 
<1 
<1 
30 <0.010 
2 0.06 
DEC 
18... 
FEB 1986 
20... 
MAY 
08... 
3500 
<1 220 <0.10 
<1 
<1 
30 <0.010 
<1 0.06 
JUL 
22... 
SEP 
22... 
 
 
         
 
    
 
     
 
 
 
 
  
 
         
           
         
           
 
 
           
 
         
 
 
 
 
 
 
     
         
 
 
          
 
         
          
 
 
   
 
 
   
          
 
 
   
      
   
220 
RIO MAUNABO BASIN 
50091000 RIO MAUNABO AT MAUNABO, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°00'24", long 65°54 1 19", at bridge on Highway 3, 0.4 mi (0.6 km) southwest of Maunabo plaza, 
and 1.3 mi (2.1 km) upstream from mouth. 
DRAINAGE AREA.--12.4 sq mi (32.1 sq km). 
PERIOD OF RECORD.--Water years 1958-66, 1975 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
17... 
1210 
41 
216 
7.90 
28.0 
14 
7.6 
19 
3500 
1900 
DEC 
17... 
1430 
19 
240 
7.80 
28.0 
3.4 
7.6 
98 
<10 
K1200 
520 
FEB 1986 
19... 
1030 
17 
240 
7.40 
26.5 
3.4 
6.8 
26 
2000 
1500 
MAY 
07... 
0955 
55 
156 
7.40 
23.5 
42 
7.8 
93 
31 
4300 
45000 
JUL 
23... 
1310 
19 
207 
7.50 
30.0 
4.2 
7.6 
101 
25 
21000 
470 
SEP 
23... 
1205 
16 
230 
7.65 
30.0 
16 
8.0 
10­r 
20 
35000 
6000 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM S1UM, SODIUM, 
AD-
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLU 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
17... 
63 
0 
15 
6.1 
17 
1 
1.1 
67 
<0.5 
11 
16 
DEC 
17... 
72 
FEB 1986 
19... 
74 
MAY 
07... 
41 
9 
9.7 
4.1 
11 
0.8 
2.1 
32 
<0.5 
10 
25 
JUL 
23... 
74 
SEP 
23... 
60 
0 
14 
6.2 
18 
1 
1.5 
72 
8.5 
15 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO20403 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
17... 
0.10 
38 
140 
16 
31 
0.490 
0.010 
0.500 
0.040 
0.36 
DEC 
17... 
5 
<0.010 
0.400 
0.020 
0.28 
FEB 1986 
19... 
13 
<0.010 
0.200 
0.030 
0.17 
MAY 
07... 
<0.10 
23 
100 
16 
60 
0.780 
0.020 
0.800 
0.150 
0.75 
JUL 
23... 
34 
<0.010 
0.200 
0.020 
0.38 
SEP 
23... 
0.20 
35 
140 
6.0 
50 
<0.010 
0.100 
0.080 
0.22 
K = non-ideal count 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
  
 
  
 
  
RIO MAUNABO BASIN 
50091000 RIO MAUNABO AT MAUNABO, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GLN,AM- 
BARIUM, BORON, CADMIUM M1UM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
17... 
0.40 
0.90 
4.0 
0.060 
<1 
<100 
40 
1 
5 
10 
DEC 
17... 
0.30 
0.70 
3.1 
0.040 
FEB 1986 
19... 
0.20 
0.40 
1.8 
0.040 
KAY 
07... 
0.90 
1.7 
7.5 
0.120 
<1 
100 
50 
<1 
2 
10 
JUL 
23... 
0.40 
0.60 
2.7 
0.050 
SEP 
23... 
0.30 
0.40 
1.8 
0.100 
MANGA- 
METHY- 
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
17... 
1500 
<1 
80 <0.10 
<1 
<1 
20 <0.010 
7 0.05 
DEC 
17...
-- 
FEB 1986 
19...
-- 
MAY 
07... 
3100 
<1 100 <0.10 
<1 
<1 
30 <0.010 
<1 0.05 
JUL 
23...
-- 
SEP 
23... 
221 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
   
 
  
 
 
   
RIO CHICO BASIN 
50091800 RIO CHICO AT PROVIDENCIA, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 17°59'16", long 66°00'18", at flat low bridge 200 ft (61 m) south of Highway 3, 0.5 mi (0.8 km) 
above mouth, and 1.5 mi (2.4 km) southeast of Patillas plaza. 
DRAINAGE AREA.--4.9 sq mi (12.8 sq km). 
PERIOD OF RECORD.--Water years 1979 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATLIRE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) (US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
31... 
1700 
40 
282 
6.90 
28.0 
18 
8.0 
104 
19 
K2000 
4900 
DEC 
17... 
1230 
2.5 
624 
7.40 
27.0 
1.5 
0.8 
87 
K140000 
20000 
FEB 1986 
13... 
1600 
0.66 
921 
7.40 
28.0 15 
0 
220 290000 K100000 
MAY 
07... 
1245 
0.38 
801 
7.40 
30.5 26 
0 
0 
240 2000000 K110000 
JUL 
23... 
1055 
0.86 
540 
7.45 
30.0 
4.0 
0 
0 
110 2500000 K140000 
SEP 
23... 
0910 
0.25 
744 
7,35 
28.5 
7.5 
0.3 
4 
270 K1200000 150000 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD- 
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
31... 
61 
0 
14 
6.3 
21 
1 
1.3 
85 
<0.5 
17 
23 
DEC 
17... 
156 
FEB 1986 
13... 
207 
MAY 
07... 
110 
0 
27 
10 
70 
3 
11 
238 
1.6 
43 
69 
JUL 
23... 
174 
SEP 
23... 
130 
0 
31 
13 
63 
2 
11 
215 
32 
70 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
31... 
0.10 
28 
160 
17 
36 
0.390 
0.010 
0.400 
0.270 
0.43 
DEC 
17... 
1 
0.010 
<0.100 
5.70 
2.9 
FEB 1986 
13... 
2 
0.020 
<0.100 
18.0 
6.0 
MAY 
07... 
<0.10 29 
400 0.41 14 
0.020 <0.100 0.290 39 
JUL 
23... 
16 
0.010 
<0.100 
12.0 
7.0 
SEP 
23... 
0.20 33 
380 0.26 23 
0.030 <0.100 4.60 31 
K = non-ideal count 
222 
 
 
    
    
 
          
         
          
  
  
  
      
  
  
 
 
    
  
        
          
       
 
          
          
223 
RIO CHICO BASIN 
50091800 RIO CHICO AT PROVIDENCIA, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
DATE 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CO) 
AS CR) 
AS CU) 
OCT 1985 
31... 
DEC 
17... 
FEB 1986 
13... 
MAY 
07... 
JUL 
23... 
SEP 
23... 
0.70 
8.6 
24 
39 
19 
36 
1.1 
4.9 
0.200 
1.20 
5.00 
<0.010 
2.50 
7.60 
<1 
1 
--
--
<100 
100 
30 
100 
1 
<1 
12 
<1 
10 
40 
DATE 
MANGA-
METHY-
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER. 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELF-
TCTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLL ERABLE TOTAL PHENOLS SUB-
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
31... 
DEC 
17... 
FEB 1986 
13... 
MAY 
07... 
JUL 
23... 
SEP 
23... 
1900 
640 
1 
2 
70 
110 
<0.10 
0.10 
<1 
<1 
<1 
<1 
10 
40 
<0.010 
0.020 
1 
42 
0.10 
5.1 
I 
I
I
I
 
     
 
    
    
 
    
    
 
    
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
224 
RIO GRANDE DE PATILLAS BASIN 
50092000 RIO GRANDE DE PATILLAS NEAR PATILLAS, PR 
LOCATION.--Lat 18°02'04", long 66°01'58", Hydrologic Unit 21010004, on left bank, at foot bridge, off Highway 184, 
1.2 mi (1.9 km) upstream fro Lago Patillas Dam and 2.2 
i (3.5 km) northwest of Patillas. 
DRAINAGE AREA.--18.3 mi' (47.4 km'). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--February 1959 to October 1965 (annual low-flow and occasional measurements only), January 1966 
to current year. 
GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 235 ft (72 
), from topographic map. 
REMARKS.--Estimated daily discharges: Oct. 27 to Nov. 18. Records fair except those for estimated daily 
discharges, which are poor. 
AVERAGE DISCHARGE.--20 years (1967-86), 60.7 ft'/s (1.719 m'/s), 45.04 in/yr (1,144 mm/yr•), 43,980 acre-ft/yr 
(54.2 hm'/yr); median of yearly mean discharges, 61 ftl/s (1.73 m'/s), 44,200 acre-ft/yr (54 he/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 14,800 ft'/s (419 '/s), Sept. 16, 1975, gage height, 
12.45 ft (3.795 m), from rating curve extended above 250 ft'/s (7.08 m'/s) on basis of slope-area measurement 
of peak flow; minimum discharge, 4.6 ft'/s (0.130 m'/s), May 13-16, 1968. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ft'/s (70.8 m'/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft'/s) 
(10/s) 
(ft) 
(m) 
Date 
Time 
(ft'/s) 
00/s) 
(ft) 
(m) 
Oct. 6 
1145 
*8,440 
239 
*12.49 3.807 
May 13 
0845 
3,490 
98.8 
9.37 2.856 
Oct. 26 
1715 
4,130 
117 
9.87 3.008 
May 18 
1200 
2,620 
74.2 
8.59 2.618 
Minimum discharge, 6.2 ft'/s (0.176 m'/s), Apr. 26, 27. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
2 
3 
4 
5 
63 
60 
88 
83 
179 
120 
80 
200 
135 
120 
44 
43 
41 
41 
47 
29 
32 
37 
45 
34 
24 
23 
33 
43 
46 
14 
13 
12 
15 
15 
35 
23 
16 
119 
55 
41 
18 
12 
9.5 
8.7 
52 
43 
43 
39 
40 
30 
26 
25 
23 
22 
18 
16 
15 
19 
17 
48 
40 
32 
28 
29 
6 
7 
8 
9 
10 
2570 
1570 
629 
245 
158 
100 
90 
80 
75 
70 
50 
48 
41 
40 
40 
28 
26 
26 
49 
49 
28 
23 
21 
21 
20 
13 
13 
11 
11 
11 
49 
24 
20 
24 
18 
36 
42 
19 
25 
251 
38 
33 
35 
134 
222 
30 
30 
22 
20 
17 
14 
25 
44 
18 
16 
28 
26 
22 
21 
20 
11 
12 
13 
14 
15 
117 
93 
76 
65 
57 
65 
85 
165 
170 
900 
40 
64 
49 
39 
36 
33 
29 
27 
26 
26 
20 
20 
20 
18 
18 
12 
12 
14 
23 
35 
16 
14 
13 
12 
12 
217 
75 
455 
257 
102 
72 
55 
59 
71 
52 
31 
38 
22 
22 
34 
55 
34 
57 
46 
22 
19 
19 
19 
20 
19 
16 
17 
18 
19 
20 
52 
64 
75 
62 
46 
230 
170 
100 
81 
73 
35 
34 
35 
38 
42 
26 
33 
35 
29 
27 
17 
24 
26 
43 
38 
18 
13 
11 
9.9 
9.3 
11 
11 
11 
11 
13 
65 
60 
443 
162 
99 
60 
49 
43 
41 
41 
28 
23 
21 
17 
15 
17 
16 
15 
14 
14 
17 
15 
11 
11 
11 
21 
22 
23 
24 
25 
45 
44 
221 
262 
204 
68 
59 
56 
53 
50 
35 
34 
32 
46 
44 
28 
26 
25 
93 
50 
26 
21 
17 
15 
15 
8.3 
7.8 
7.8 
7.8 
7.1 
12 
9.4 
9.0 
8.4 
8.0 
81 
77 
58 
48 
43 
37 
33 
31 
30 
30 
19 
16 
14 
12 
12 
13 
12 
13 
15 
13 
11 
17 
26 
90 
111 
26 
27 
28 
29 
30 
31 
553 
280 
110 
280 
250 
270 
49 
47 
46 
44 
47 
---
41 
33 
34 
31 
32 
29 
36 
30 
29 
28 
29 
26 
15 
14 
14 
---
9.4 
18 
18 
216 
45 
36 
7.0 
7.2 
10 
213 
75 
---
40 
38 
37 
44 
39 
161 
30 
36 
32 
27 
24 
---
11 
9 8 
14 
16 
28 
22 
11 
11 
111 
573 
101 
58 
67 
33 
26. 
22 
20 
---
TOTAL 
MEAN 
MAX 
MIN 
CFSM 
IN. 
AC-FT 
8871 
286 
2570 
44 
15.6 
18.03 
17600 
3628 
121 
900 
44 
6.61 
7.37 
7200 
1238 
39.9 
64 
29 
2.18 
2.52 
2460 
1046 
33.7 
93 
25 
1.84 
2.13 
2070 
663 
23.7 
46 
14 
1.30 
1.35 
1320 
666.4 
21.5 
216 
7.1 
1.17 
1.35 
1320 
866.0 
28.9 
213 
7.0 
1.58 
1.76 
1720 
3063.2 
98.8 
455 
8.7 
5.40 
6.23 
6080 
1532 
51.1 
222 
24 
2.79 
3.11 
3040 
669.8 
21.6 
38 
9.•3 
1.18 
1.36 
1330 
1423 
45.9 
573 
11 
2.51 
2.89 
2820 
878 
29.3 
111 
11 
1.60 
1.78 
1740 
CAL YR 1985 
WTR YR 1986 
TOTAL 
TOTAL 
25899.5 
24544.4 
MEAN 
MEAN 
71.0 
67.2 
MAX 
MAX 
2570 
2570 
MIN 
MIN 
8.3 
7.0 
CFSM 
CFSM 
3.88 
3.67 
IN. 
IN. 
52.65 
49.89 
AC-FT 
AC-FT 
51370 
48680 
 
 
         
 
    
 
 
    
 
           
           
      
   
           
 
 
 
 
  
  
          
       
           
         
           
           
 
           
 
 
        
   
    
     
   
  
          
 
 
    
  
 
       
 
 
 
 
 
         
  
    
          
         
          
          
          
225 
RIO GRANDE DE PATILLAS BASIN 
50092000 RIO GRANDE DE PATILLAS NEAR PATILLAS, PR--Continued 
(National stream-quality accounting network station) 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1960 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, COLI- STREP-
SPE-
DIS- FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED FECAL, FECAL, HARD-
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
0.7 
KF AGAR 
NESS 
INSTAN- DUCT- (STAND- ATURE BID- D1S- CENT UM-MF (COLS. (MG/L 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- (COLS./ PER 
AS 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) 100 ML) 100 ML) 
CAC03) 
OCT 1985 
21... 
1530 
58 
173 
8.20 
27.0 
16 
8.6 
108 
K5600 
K5500 
49 
JAN 1986 
13... 
1500 
27 
156 
8.30 
27.0 
1.0 
7.6 
96 
>1200 
K39 
49 
APR 
07... 
1410 
24 
138 
8.10 
27.0 
8.0 
102 
300 
530 
JUL 
01... 
1220 
33 
154 
8.00 
27.5 
1.8 
8.3 
106 
380 
300 
48 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO- FLUO- SILICA, 
NONCARB CALCIUM SIUM, SODIUM, 
AD-
SIUM, WATER SULFATE RIDE, 
RIDE, 
DIS-
WATER 
DIS-
DIS-
DIS-
SORP-
DIS-
TOTAL 
DIS-
DIS-
DIS-
SOLVED 
TOT FLD .SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
SOLVED 
SOLVED 
SOLVED. (MG/L • 
DATE 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
AS 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS SO4) 
AS CL) 
AS F) 
SI02) . 
OCT 1985 
21... 
1 
11 
5.1 
14 
0.9 
0.70 
48 
8.2 
12 
<0.10 
26 
JAN 1986 
13... 
0 
11 
5.1 
13 
0.8 
0.40 
56 
11 
11 
0.10 
23 
APR 
07... 
40 
JUL 
01... 
0 
11 
4.9 
14 
0.9 
0.60 
74 
11 
9.7 
0.20 
24 
SOLIDS, SOLIDS, 
NITRO- NITRO- NITRO-. NITRO-
PHOS- PHOS-
RESIDUE SUM OF 
SOLIDS, 
GEN, 
GEN, 
GEN; 
GEN,AM-
PHOS-
PHORUS, 
PHATE, 
AT 180 
CONSTI-
DIS-
NO214403 AMMONIA AMMONIA MONIA + 
PHOS-
PHORUS, 
ORTHO, 
ORTHO, 
DEG% C TUENTS, 
SOLVED 
DIS-
DIS-
DIS-
ORGANIC PHORUS, 
DIS-
DIS-
DIS-
DIS-
DIS-
(TONS SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED SOLVED SOLVED 
DATE SOLVED SOLVED PER (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L 
(MG/L) 
(MG/L) 
DAY) 
AS N) 
AS N) 
AS NH4) 
AS N) 
AS P) 
AS P) 
AS P) 
AS PO4) 
OCT 1985 
21... 
101 110 16 
0.140 0.120 0.15 0.30 0.020 <0.010 <0.010 
JAN 1986 
13... 
103 
110 
7.5 
0.30 
0.030 
0.010 
--
APR 
07... 
0.100 
0.030 
0.04 
0.30 
0.020 
0.030 
0.010 
0.03 
JUL 
01... 
'105 120 9.3 <0.100 <0.010 
0.30 0.020 0.020 0.020 0.06 
ALUM-
BERYL-
CHRO-
INUM, ARSENIC BARIUM, .LIUM, CADMIUM MIUM, COBALT, COPPER, IRON, 
LEAD, 
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
SOLVED 
SCLVED SOLVED 
SOLVED - SOLVED 
SOLVED SOLVED 
SOLVED 
SOLVED 
SOLVED 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS AL) 
AS AS) 
AS BA) 
AS BE) 
AS CD) 
AS CR) 
AS CO) 
AS CU) 
AS FE) 
AS PB) 
OCT 1985 
21... 
40 
1 
17 
<0.5 
<1 
<1 
<3 
<1 
41 
<1 
JAN 1986 
13... 
10 
<1 
16 
<0.5 
<1 
<1 
<3 
1 
18 
<1 
APR 
07... 
JUL 
01... 
20 
<1 
11 
<0.5 
<1 
<1 
<3 
1 
18 
<5 
K = non-ideal count 
 
  
         
          
         
 
 
 
 
226 
RIO GRANDE DE PATILLAS BASIN 
50092000 RIO GRANDE DE PATILLAS NEAR PATILLAS, PR--Continued 
(National stream-quality accounting network station) 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MANGA-
MOLYB-
SELE-
STRON- VANA-
LITHIUM NESE, MERCURY DENUM, NICKEL, NIUM, SILVER, TIUM, DIUM, ZINC, 
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS LI) 
AS MN) 
AS HG) 
AS MO) 
AS NI) 
AS SE) 
AS AG) 
AS SR) 
AS V) 
AS ZN) 
OCT 1985 
21... 
<4 
18 
0.2 
<10 
<1 
<1 
<1 
39 
<6 
7 
JAN 1986 
13... 
<4 
7 
<0.1 
<10 
<1 
<1 
<1 
39 
<6 
4 
APR 
07... 
JUL 
01... 
<4 
5 
<0.1 
<10 
<1 
<1 
<1 
38 
<6 
7 
PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT 
SED. 
SEDI-
SUSP. 
MENT, 
SIEVE 
STREAM- SEDI- DIS- DIAM. 
FLOW, MENT, CHARGE, PERCENT 
1NSTAN- SUS- SUS- FINER 
DATE TIME TANEOUS PENDED PENDED THAN 
(CFS) 
(MG/L) (T/DAY) 
.062 MM 
OCT 1985 
21... 
1505 
88 
43 
10 
79 
JAN 1986 
13... 
1530 
24 
26 
1.7 
90 
APR 
07... 
1400 
25 
21 
_1.4 
95 
JUL 
01... 
1210 
29 
25 
2.0 
98 
I
 
 
VIL ALBA 
'o 
Rio Grande de &twat,' basin 
AIRONITO 
Rio de to Plata boci 
EXPLANATION 
SURFACE-WATER STATION 
AND NUMBER 
QUALITY-OF--WATER 
STATION AND NUMBER 
WELL AND WELL NUMBER 
ego 
ea Vaca 
•90 
Gooyabal 
Drainage boundary 
Drainage 
boundary, 
UAN 
DIAZ 
Rio Gooman3" weir 
Cocuno 
Rio Seco basin 
GUAYANIA 
SANTA ISABEL 
8 
rix 
de Jobos 
•MAYASUEZ 
GACWAS. 
AUAYAMAC. 
5 KILOMETERS 
M ap area 
1 
5 MILES 
Figure 21.--South coast river basins--Rio Salinas to Rio Jacaguas basins. 
 
 
         
 
    
 
     
           
 
 
 
         
 
 
 
 
           
          
 
 
 
 
  
 
         
           
         
           
 
 
           
 
          
 
 
 
     
         
 
 
          
         
 
       
 
     
          
 
     
         
228 
RIO COAMO BASIN 
50106500 RIO COAMO NEAR COAMO, PR 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1978 to current year. 
WATER-QUALITY RECORDS, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1985 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- 01S- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
NOV 1985 
02... 
1240 
143 
677 
8.00 
28.0 
44 
8.4 
109 
10 
4800 
1700 
DEC 
2... 
1500 65 
682 8.20 28.0 12 
9.2 120 
10 K13000 870 
FEB 1986 
25... 
1130 
15 
715 
7.90 
26.0 
2.4 
8.4 
104 
25 
APR 
29... 
1220 15 
675 8.20 30.0 2.3 
8.0 108 
50 K71000 8800 
JUL 
07... 
1200 
21 
609 
8.15 
31.5 
2.0 
9.1 
125 
21 
370 
K140 
SEP 
3... 
1240 
17 
571 
8.00 
33.0 
3.0 
6.2 
88 
<10 
K6500 
520 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD-
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
NOV 1985 
02... 
240 
26 
66 
19 
28 
0.8 
2.8 
217 
<0.5 
30 
38 
DEC 
02... 
217 
FEB 1986 
25... 
236 
APR 
29... 
240 
0 
65 
20 
38 
1 
3.3 
245 
<0.5 
33 
47 
JUL 
07... 
232 
SEP 
03.,. 
240 
22 
63 
19 
35 
1 
3.3 
214 
34 
36 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
NOV 1985 
02... 
0.20 31 
350 133 
87 3.38 0.020 3.40 0.160 0.54 
DEC 
2... 
24 
4.06 
0.040 
4.10 
0.330 
0.67 
FEB 1986 
25... 
12 
3.19 
0.210 
3.40 
0.660 
0.74 
APR 
29... 
0.20 
27 
380 
15 
32 
1.58 
0.120 
1.70 
1.60 
0.80 
JUL 
07... 
5 
2.27 
0.130 
2.40 
0,360 
0.54 
SEP 
3... 
0.20 
32 
350 
16 
4 
2.08 
0.120 
2.20 
0.800 
0.60 
K = non-ideal count 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
  
 
 
  
 
  
 
229 
RIO COAMO BASIN 
50106500 RIO COAMO NEAR COAMO, PR--Continued 
WATER-QUALITY RECORDS, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
NOV 1985 
02... 
0.70 
4.1 
18 
0.270 
1 
100 
30 
<1 
13 
20 
DEC 
2... 
1.0 
5.1 
23 
0.310 
FEB 1986 
25... 
1.4 
4.8 
21 
0.760 
APR 
29... 
2.4 
4.1 
18 
0.730 
1 
<100 
60 
<1 
5 
10 
JUL 
07... 
0.90 
3.3 
15 
0.460 
-- 
SEP 
3... 
1.4 
3.6 
16 
0.630 
-- 
MANGA- 
METHY- 
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
'TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
NOV 1985 
02... 
4900 
2 140 0.10 
<1 
<1 
40 <0.010 
<1 0.05 
DEC 
2... 
FEB 1986 
25...
-- 
APR 
29... 
360 
1 110 <0.10 
<1 
<1 
30 <0.010 
3 0.25 
JUL 
07...
-- 
SEP 
3... 
I
I
I 
I
I
 
 
 
 
  
 
 
 
  
I
 
            
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
230 
RIO DESCALABRADO BASIN 
50108000 RIO DESCALABRADO NEAR LOS LLANOS, PR 
LOCATION.--Lat 18°03'08", long 66°25'34", Hydrologic Unit 21010004, at bridge on Highway 14, 1.5 •i (2.4 km) west 
of Los Llanos, and 5.3 mi (8.5 km) east of Juana Diaz. 
DRAINAGE AREA.--12.9 i2 (33.4 km2 ). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--1959-65 (annual low-flow measurements only), 1965 (annual maximum discharge), January 1966 to 
June 1969, July to December 1969 (maximum discharge only), February 1984 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 220 ft (67 m), from topographic map. 
REMARKS.--Estimated daily discharges: Oct. 1-24, Dec. 13 to Jan. 9. Records fair except those for estimated 
daily discharges, which are poor. 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 30,000 ft'is (850 m'/s), Oct. 7, 1985, gage height, 24.37 ft 
(7.43 
), fro rating curve extended above 10,000 ft'/s (283 m'/s) on basis of step-backwater analysis; no flow 
any days. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft'is (42.5 
'/s) and 
maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time (W/s) (m3 /s) (ft) (m) 
Date 
Time (W/s) (10/s) (ft) (m) 
Oct. 7 unknown *30,000 850 
*24.37 7.428 
May 13 
0645 7,900 
224 
14.56 4.448 
Minimum daily discharge, 0.90 ft'/s (0.025 
'/s), Aug. 21-23. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
2 
3 
4 
5 
5.7 
5.6 
5.4 
5.0 
6.0 
23 
21 
27 
15 
13 
7.8 
7.5 
8.8 
9.4 
9.1 
6.2 
6.4 
6.0 
6.2 
6.0 
4.7 
4.6 
5.0 
5.2 
4.7 
2.1 
2.3 
2.3 
2.3 
2.3 
1.8 
1.8 
2.1 
6.3 
3.7 
2.7 
1.8 
2.7 
1.7 
1.4 
13 
11 
11 
11 
10 
4.7 
4.6 
4.4 
4.3 
4.3 
2.5 
2.3 
2.1 
1.9 
1.8 
3.5 
2.5 
2.2 
2.1 
1.8 
6 
7 
8 
9 
10 
200 
2600 
300 
30 
22 
64 
32 
26 
21 
20 
8.6 
8.3 
11 
12 
10 
6.2 
6.4 
6.2 
7.0 
6.5 
4.2 
4.0 
3.6 
3.4 
3.2 
2.3 
2.2 
2.2 
2.1 
2.2 
2.6 
2.4 
2.6 
3.7 
2.5 
1.4 
2.3 
3.0 
1.9 
16 
9.7 
9.4 
9.1 
8.9 
9.3 
4.3 
4.5 
4.3 
4.3 
4.0 
1.7 
2.0 
4.5 
2.2 
2.0 
1.6 
1.6 
1.6 
1.5 
1.5 
11 
12 
13 
14 
15 
18 
16 
15 
20 
13 
19 
17 
16 
15 
15 
10 
10 
9.8 
9.4 
9.0 
6.1 
6.3 
6.2 
6.0 
6.2 
3.1 
3.1 
2.9 
2.6 
2.9 
2.1 
2.1 
1.9 
2.0 
1.9 
2.2 
2.0 
1.9 
1.9 
1.9 
32 
2.9 
686 
74 
26 
8.1 
7.7 
7.6 
7.3 
7.0 
3.9 
3.& 
3.4 
3.6 
4.2 
1.9 
1.6 
1.4 
1.8 
1.7 
1.4 
1.6 
1.7 
1.6 
1.6 
16 
17 
18 
19 
20 
10 
9.0 
8.4 
8.0 
7.4 
13 
13 
14 
11 
10 
8.8 
8.4 
8.2 
8.4 
8.6 
6.2 
6.6 
6.7 
6.2 
6.3 
2.8 
3.0 
3.1 
2.8 
3.7 
1.9 
1.8 
2.0 
2.4 
2.2 
3.2 
5.1 
2.3 
1.9 
1.8 
16 
17 
14 
9.4 
7.7 
7.0 
6.6 
6.4 
6.4 
6.0 
3.8 
3.? 
3.0 
2.8 
2.3 
1.4 
1.3 
1.3 
1.3 
1.2 
1.5 
1.5 
1.5 
1.4 
1.5 
21 
22 
23 
24 
25 
8.0 
7.0 
10 
12 
10 
10 
9.2 
9.5 
9.6 
9.2 
9.0 
8.8 
8.6 
8.6 
8.0 
6.1 
5.8 
5.7 
5.7 
7.6 
3.3 
3.0 
2.4 
2.2 
2.0 
2.2 
1.9 
1.7 
1.6 
1.6 
1.7 
1.7 
1.7 
1.6 
1.7 
7.0 
6.1 
5.2 
4.4 
3.8 
5.8 
5.6 
5.4 
5.2 
5.2 
2.8 
2.6 
2.5 
2.9 
3.8 
1.1 
1.1 
4.5 
1.4 
1.1 
1.5 
1.5 
1.5 
2.1 
2.3 
26 
27 
28 
29 
30 
31 
12 
5.6 
15 
38 
95 
25 
8.8 
8.0 
7.8 
7.9 
8.0 
---
7.4 
6.8 
6.3 
6.2 
6.0 
6.0 
8.0 
6.2 
6.8 
5.9 
9.2 
6.3 
3.0 
2.1 
2.1 
---
1.6 
1.5 
1.6 
1.6 
1.5 
1.6 
1.7 
1.7 
2.4 
78 
5.8 
---
2.9 
2.2 
1.7 
19 
8.3 
77 
5.1 
5.1 
5.0 
4.7 
4.7 
---
3.0 
2.8 
2.7 
2.6 
2.7 
2.9 
1.2 
1.1 
1.8 
21 
2.0 
3.1 
2.0 
2.2 
2.7 
2.1 
1.4 
---
TOTAL 
MEAN 
MAX 
MIN 
CFSM 
IN. 
AC-FT 
3542.1 
114 
2600 
5.0 
8.84 
10.21 
7030 
493.0 
16.4 
64 
7.8 
1.27 
1.42 
978 
264.8 
8.54 
12 
6.0 
.66 
.76 
525 
199.2 
6.43 
9.2 
5.7 
.50 
.57 
395 
92.7 
3.31 
5.2 
2.0 
.26 
.27 
184 
61.0 
1.97 
2.4 
1.5 
.15 
.18 
121 
151.7 
5.06 
78 
1.6 
.39 
.44 
301 
1057.5 
34.1 
61d 
1.4 
2.64 
3.05 
2100 
224.3 
7.48 
13 
4.7 
.58 
.65 
445 
109.5 
3.53 
4.7 
2.5 
.27 
.32 
217 
77.3 
2.49 
21 
1.1 
.19 
.22 
153 
54.5 
1.82 
3.5 
1.4 
.14 
.16 
108 
CAL YR 1985 
WTR YR 1986 
TOTAL 
TOTAL 
7144.43 
6327.6 
MEAN 
MEAN 
19.6 
17.3 
MAX 
MAX 
2600 
2600 
MIN 
MIN 
.47 
1.1 
CFSM 
CFSM 
1.52 
1.34 
IN. 
IN. 
20.60 
18.25 
AC-FT 
AC-FT 
14170 
12550 
I
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231 
RIO JACAGUAS BASIN 
50111500 RIO JACAGUAS AT JUANA DIAZ, PR 
LOCATION.--Lat 18°03'16", long 66°30'40", Hydrologic Unit 21010004, on Highway 14 bridge, 0.4 mi (0.6 km) west 
of Juana Diaz plaza, and 4.0 mi (6.4 km) downstream from Lago Guayabal. 
DRAINAGE AREA.--49.8 mil (129.0 km 2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--March 1984 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 131 ft (40 m), from topographic map. 
REMARKS.--Estimated daily discharges: Oct. 1, 2, Oct. 7-30, Jan. 24 to Feb. 2 and Feb. 9-15. Records fair 
except those fc- estir:Aed daily discharges, which are poor. Flow regulation from Lago Guayabal. 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 40,000 ft'is (1,130 3/s), Oct. 7, 1985, gage height, 29.42 ft 
(8.967 ) from :sting curve extended above 500 ft'/s (14.2 10/s) on basis of step-backwater analysis and 
logarithmic extension; minimum daily discharge, 1.2 ft3/s (0.034 e/s), May 18, 1984. 
EXTREMES FOR CURRENT YEAR.--Maximum discharge, 40,000 ft'/s (1,130 m'/s), Oct. 7, gage height, 29.42 ft (8.967 ) 
from rating curve extended above 500 ft'is (14.2 50/s) on basis of step-backwater analysis and logarithmic 
extension; minimum daily discharge 1.6 ft'is (0.045 a'/s), Mar. 21. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
100 
259 
55 
32 
8.3 
4.6 
2.7 
8.9 
84 
7.8 
6.2 
6.4 
2 
90 
225 
58 
36 
15 
4.4 
2.9 
8.1 
56 
7.8 
6.3 
4.7 
3 
43 
275 
82 
34 
21 
4.5 
3.6 
11 
78 
6.9 
6.2 
4.8 
4 
31 
181 
85 
29 
18 
4.6 
4.3 
54 
99 
7.3 
6.2 
5.4 
5 
40 
547 
80 
17 
17 
4.5 
5.3 
52 
99 
7.7 
6.4 
4.8 
6 
3440 
215 
80 
19 
16 
4.4 
5.6 
56 
91 
8.2 
6.7 
3.9 
7 
3000 
249 
71 
33 
14 
4.3 
5.5 
65 
73 
8.3 
7.1 
3.9 
8 
1000 
184 
48 
42 
13 
4.2 
5.7 
81 
78 
8.3 
7.2 
3.7 
9 
500 
143 
51 
53 
13 
3.7 
7.4 
104 
114 
8.6 
6.5 
4.5 
10 
250 
107 
64 
57 
12 
3.6 
7.2 
148 
97 
7.4 
6.4 
5.0 
11 
240 
103 
60 
42 
10 
3.3 
7.0 
488 
105 
7.6 
6.6 
5.0 
12 
210 
136 
53 
19 
7.8 
2.8 
7.5 
131 
77 
7.8 
6.6 
4.5 
13 
200 
125 
52 
18 
7.4 
2.8 
7.8 
2150 
64 
7.3 
7.9 
4.2 
14 
300 
118 
52 
38 
7.0 
3.0 
7.8 
796 
38 
7.7 
8.7 
4.6 
15 
200 
128 
45 
33 
6.6 
2.9 
7.8 
280 
13 
8.2 
8.5 
4.8 
16 
180 
149 
43 
31 
6.6 
2.7 
7.6 
185 
8.6 
7.6 
9.0 
4.9 
17 
150 
114 
47 
25 
6.5 
2.6 
7.3 
135 
21 
7.5 
8.1 
5.3 
18 
140 
160 
50 
22 
6.2 
2.4 
7.9 
148 
46 
7.4 
7.6 
5.4 
19 
130 
146 
35 
16 
6.5 
2.3 
7.5 
150 
52 
6.6 
7.6 
3.6 
20 
120 
117 
29 
12 
6.6 
1.9 
7.3 
136 
22 
6.6 
8.0 
3.5 
21 
140 
107 
38 
20 
6.3 
1.6 
7.1 
120 
18 
6.6 
7.9 
3.5 
22 
110 
100 
23 
22 
5.9 
4.4 
6.7 
121 
12 
6.6 
8.0 
3.6 
23 
300 
81 
25 
13 
5.9 
5.2 
6.2 
112 
8.1 
6.6 
7.9 
3.7 
24 
450 
71 
39 
12 
5.9 
5.4 
6.3 
78 
6.6 
6.7 
8.4 
4.4 
25 
400 
73 
44 
11 
5.6 
5.4 
7.5 
46 
10 
6.9 
7.6 
4.4 
26 
450 
90 
53 
10 
4.7 
5,0 
7.8 
56 
9.8 
6.2 
6.5 
4.0 
27 
250 
89 
43 
10 
4.4 
5.0 
7.4 
69 
8.9 
5.4 
6.1 
17 
28 
200 
91 
31 
9.7 
5.0 
3.8 
8.0 
53 
8.3 
5.2 
5.9 
11 
29 
300 
86 
19 
9.7 
---
3.6 
12 
177 
7.7 
5.3 
31 
7.8 
30 
500 
83 
21 
9.2 
3.2 
9.9 
149 
7.6 
5.8 
12 
7.3 
31 
319 
---
35 
8.7 
2.8 
---
131 
---
6.5 
9.4 
---
TOTAL 
13783 
4552 
1511 
743.3 
262.2 
114.9 
204.6 
6299.0 
1412.6 
220.4 
254.5 
159.6 
MEAN 
445 
152 
48.7 
24.0 
9.36 
3.71 
6.82 
203 
47.1 
7.11 
8.21 
5.32 
MAX 
3440 
547 
85 
57 
21 
5.4 
12 
2150 
114 
8.6 
31 
17 
MIN 
31 
71 
19 
8.7 
4.4 
1.6 
2.7 
8.1 
6.6 
5.2 
5.9 
3.5 
CFSM 
8.94 
3.05 
.98 
.48 
.19 
.07 
.14 
4.08 
.95 
.14 
.16 
.11 
IN. 
10.30 
3.40 
1.13 
.56 
.20 
.09 
.15 
4.71 
1.06 
.16 
.19 
.12 
AC-FT 
27340 
9030 
3000 
1470 
520 
228 
406 
12490 
2800 
437 
505 
317 
MAX 
3440 
MIN 
2.2 
CFSM 2.00 
IN. 
27.19 
AC-FT 
72200 
WTR YR 1986 TOTAL 
29517.1 
MEAN 
80.9 
MAX 
3440 
MIN 
1.6 
CFSM 1.62 
IN. 
22.05 
CAL YR 1985 TOTAL 
36401.7 
MEAN 
99.7 
AC-FT 
58550 
 
 
 
  
 
Rio Grande de Arecibo basin 
Rio Grande de Aliasco bnsin 
Drainage boundary. 
Drainage boundary,\ 
R10 Guonojibo basin 
ABANA GRANDE 
11 5 
pa Na 
aaa Na 
Logo Loco 
JUANA 
DIA Z 
UAYANIILLA 
24 
Sahl'o 
de Guayana& 
Bottsb 
da ra Hobo° 
PLAYA 
1297 
DE 'PONCE 
ENSENADA 
GUANICA 
EXPLANATION 
CARIBBEAN 
SE A 
Al 125 SURFACE—WATER STATION AND NUMBER 
At 159 CREST—STAGE GAGING STATION AND NUMBER 
V1140 QUALITY—OF—WATER STATION AND NUMBER 
• 141 WELL AND WELL NUMBER 
5 KILOMETERS 
1
Map area 
4 
5 MILES 
1.10718=1. 
Figure 22.--South coast river basins--Rio Inabon to Rio Loco basins. 
I
I
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
234 
RIO INABON BASIN 
50112500 RIO INABON AT REAL ABAJO, PR 
LOCATION.--Lat 18°05'10*, long 66°33'46', Hydrologic Unit 21010004, at bridge on private road, off Highway 511 
at Hacienda La Concordia, 0.4 i (0.6 km) upstream from diversion canal, 0.5 i (0.8 km) north of Real Abajo, 
and 6.1 mi (9.8 km) northeast of Plaza Degetau in Ponce. 
DRAINAGE AREA.--9.70 miz (25.12 km2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--1962-63 (annual low-flow measurements only), February to June 1964 (monthly measurements only), 
July 1964 to July 1970, April 1971 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 410 ft (125 m), from topographic map. Prior to April 1971 
nonrecording gage and crest-stage gage at different datum. 
REMARKS.-Estimated daily discharges: Nov. 4-25. Records fair except those for estimated daily discharges, which 
are poor. 
AVERAGE DISCHARGE.--20 years (1965-69, 1972-86), 19.0 ft'is (0.538 m3/s), 26.60 in/yr (676 mm/jr), 13,760 acre-ft/yr 
(17.0 hm 3/yr); median of yearly mean discharges, 18 ft'/s (0.51 e/s), 13,000 acre-ft/yr (16 hm3/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 19,000 ft'/s (538 0/s), Oct. 7, 1985, gage height, 25.3 ft 
(7.71 m), datum then in use, from floodmark, from rating curve extended above 30 ft3/s (0.850 10/s) on basis 
of contracted opening and flow-over-road measurements of peak flow; minimum daily discharge, 0.80 ft3/s 
(0.023 m 3/s), July 23, 1977 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft'is (14.2 e/s), and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft3/s) 
(m 3/s) 
(ft) 
(m) 
Date 
Time 
(ft3/s) (10/s) 
(ft) 
(m) 
Oct. 7 
0300 *19,000 
538 
*25.30 7.711 
Oct. 26 
1745 
896 
25.4 
9.97 3.039 
Oct. 14 
1615 
651 
18.4 
7.89 2.405 
May 13 
2215 
1,200 
34.0 
12.26 3.737 
Oct. 23 
1915 
680 
19.2 
8.15 2.484 
July 24 
1445 
713 
20.2 
8.43 2.569 
Minimum discharge, 1.8 ft'/s (0.051 e/s), Mar. 17. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
26 
61 
18 
6.8 
5.6 
4.2 
4.2 
22 
i1 
6.1 
9.1 
21 
2 
23 
52 
17 
7.3 
4.8 
4.0 
5.5 
15 
9.7 
5.9 
7.3 
15 
3 
21 
56 
16 
7.0 
6.1 
6.5 
14 
17 
11 
5.8 
6.2 
13 
4 
19 
48 
16 
7.2 
6.5 
4.6 
19 
23 
10 
7,,6 
5.3 
13 
5 
23 
45 
15 
7.1 
7.6 
4.0 
18 
18 
9.7 
8.0 
4.9 
10 
6 
519 
90 
16 
7.3 
5.4 
3.4 
15 
19 
9.3 
8.6 
4.9 
9.2 
7 
1840 
70 
15 
7.5 
4.9 
3.5 
8.2 
24 
9.6 
7.6 
8.2 
8.5 
8 
343 
57 
14 
7.2 
4.6 
3.0 
12 
23 
16 
7.1 
18 
7.8 
9 
122 
52 
13 
9.6 
4.3 
2.8 
16 
21 
13 
6.4 
8.3 
7.2 
10 
95 
44 
13 
8.9 
4.0 
2.9 
8.3 
48 
14 
5.9 
6.6 
6.2 
11 
85 
37 
12 
6.9 
4.2 
2.8 
6.4 
76 
16 
6.6 
5.2 
5.8 
12 
80 
47 
12 
6.8 
4.0 
2.8 
5.7 
32 
17 
7.6 
4.8 
5.6 
13 
83 
37 
11 
6.8 
3.8 
2.9 
5.1 
325 
21 
7.0 
7.6 
5.6 
14 
102 
31 
11 
6.7 
3.5 
2.7 
4.6 
141 
26 
6.3 
7.1 
5.6 
15 
76 
34 
10 
6.5 
3.4 
2.4 
4.3 
38 
22 
9.0 
5.3 
5.6 
16 
54 
50 
9.8 
6.5 
3.3 
2.4 
5.3 
25 
8.1 
6.3 
4.6 
5.3 
17 
47 
49 
9.5 
6.5 
3.5 
13 
4.5 
20 
8.0 
3.7 
4.3 
5.1 
18 
43 
70 
9.1 
6.5 
3.7 
14 
6.5 
18 
7,8 
4.3 
4.1 
4.8 
19 
39 
52 
9.2 
6.4 
11 
6.6 
6.3 
18 
7.8 
4.3 
4.1 
4.8 
20 
38 
38 
9.5 
6.2 
21 
4.9 
4.4 
15 
7.7 
4.7 
3.3 
5.3 
21 
41 
32 
9.8 
6.2 
8.6 
4.3 
4.4 
14 
7.5 
4.0 
2.8 
4.8 
22 
36 
28 
9.6 
6.2 
5.9 
3.9 
4.1 
13 
7.3 
3.7 
2.8 
4.7 
23 
87 
27 
9.4 
6.2 
4.8 
3.7 
3.8 
12 
7.0 
3.2 
12 
5.1 
24 
107 
24 
9.1 
6.4 
4.5 
3.7 
4.0 
12 
7.8 
39 
9.7 
6.6 
25 
94 
22 
8.9 
7.0 
4.4 
3.6 
3.8 
11 
8.3 
12 
7.6 
7.1 
26 
107 
22 
8.3 
7.0 
3.8 
3.6 
3.8 
12 
7.6 
8.8 
8.1 
5.6 
27 
89 
20 
7.5 
6.1 
3.7 
3.5 
3.8 
10 
7.7 
10 
6.2 
8.3 
28 
79 
20 
7.3 
6.0 
3.5 
3.3 
5.2 
11 
6.6 
10 
5.8 
11 
29 
68 
19 
6.7 
5.9 
---
10 
34 
16 
6.5 
9.2 
35 
7.4 
30 
109 
19 
6.7 
9.5 
7.4 
26 
15 
6.5 
13 
22 
6.1 
31 
83 
---
6.5 
7.1 
4.5 
---
14 
---
12 
26 
---
TOTAL 
4578 
1253 
345.9 
215.3 
154.4 
144.9 
266.2 
1078 
327.5 
253.7 
267.2 
231.1 
MEAN 
148 
41.8 
11.2 
6.95 
5.51 
4.67 
8.87 
34.8 
10.9 
8.18 
8.62 
7.70 
MAX 
1840 
90 
18 
9.6 
21 
14 
34 
325 
26 
39 
35 
21 
MIN 
19 
19 
6.5 
5.9 
3.3 
2.4 
3.8 
10 
6.5 
3.2 
2.8 
4.7 
CFSM 
15.3 
4.31 
1.15 
.72 
.57 
.48 
.91 
3.59 
1.12 
.84 
.89 
.79 
IN. 
17.56 
4.81 
1.33 
.83 
.59 
.56 
1.02 
4.13 
1.26 
.97 
1.02 
.89 
AC-FT 
9080 
2490 
686 
427 
306 
287 
528 
2140 
650 
503 
530 
458 
CAL YR 1985 TOTAL 11799.9 
MEAN 
32.3 
MAX 
1840 
MIN 
1.7 
CFSM 3.33 
IN. 
45.25 
AC-FT 
23410 
WTR YR 1986 TOTAL 
9115.2 
MEAN 
25.0 
MAX 
1840 
MIN 
2.4 
CFSM 2.58 
IN. 
34.96 
AC-FT 
18080 
235 
RIO INABON BASIN 
50112500 RIO INABON AT REAL ABAJO, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
DATE 
TIME INSTANTANEOUS 
DUCTANCE 
TURE 
DATE 
TIME INSTANTANEOUS 
DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
OCT, 28 1203 
82 
250 
24.5 
JUL, 22 1147 
4.4 
276 
28.5 
APR, 24 1150 
4.0 
272 
25.5 
AUG, 25 1203 
7.0 
255 
29.0 
MAY, 28 1041 
11 
245 
25.5 
SEP, 26 1204 
5.5 
265 
28.5 
JUN, 24 1014 
6.8 
256 
26.0 
 
 
         
 
    
 
     
 
 
 
 
 
 
  
 
         
           
         
 
 
 
 
 
     
         
 
 
          
         
 
 
236 
RIO BUCANA BASIN 
50114000 RIO CERRILLOS NEAR PONCE, PR 
Location.--Lat 18°04'15", long 66°34'51", Hydrologic unit 21010004, on right bank off Highway 139, 2.3 mi 
(3.7 km) upstream from Quebrada Ausubo and 4.6 mi (7.4 km) northeast of Plaza Degetau in Ponce. 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1964 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
04... 
1655 
41 
254 
8.40 
28.0 
6.0 
8.0 
102 
28 
640 
570 
DEC 
3... 
1300 
23 
316 
8.20 
24.5 
220 
8.0 
97 
18 
K120 
550 
FEB 1986 
4... 
1630 
12 
313 
8.40 
24.5 
22 
4.4. 
53 
40 
K120 
200 
APR 
30... 
0955 
45 
225 
8.00 
22.5 
20 
8.5 
100 
12 
K1800 
3300 
JUL 
08... 
1230 
11 
264 
8.25 
28.5 
1.6 
9.0 
117 
K18 
66 
SEP 
04... 
1310 
25 
240 
8.10 
27.0 
23 
8.4 
107 
31 
570 
530 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD-
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
04... 
110 
11 
35 
6.5 
9.8 
0.4 
1.2 
103 
<0.5 
18 
8.0 
DEC 
03... 
126 
FEB 1i
6 
04... 
121 
APR 
30... 
89 
5 
28 
4.7 
7.9 
0.4 
1.1 
84 
<0.5 
13 
7.4 
JUL 
08... 
111 
--
SEP 
04... 
110 
8 
34 
5.5 
8.9 
0.4 
1.2 
100 
15 
6.2 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C. NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
04... 
<0.10 
23 
160 
18 
5 
0.390 
0.010 
0.400 
0.030 
0.37 
DEC 
3... 
478 
0.650 
0.050 
0.700 
0.120 
0.28 
FEB 1986 
4... 
27 
<0.010 
0.600 
0.020 
0.38 
APR 
30... 
<0.10 
16 
130 
16 
20 
1.48 
0.020 
1.50 
0.050 
0.45 
JUL 
08... 
5 
<0.01C 
0.200 
0.020 
0.28 
SEP 
04... 
<0.10 
20 
150 
10 
26 
<1.010 
0.500 
0.040 
0.26 
K = non-ideal count 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
  
 
  
 
  
 
  
RIO BUCANA BASIN 
50114000 RIO CERRILLOS NEAR PONCE, PR--Continued 
WATER QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER. 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
04... 
0.40 
0.80 
3.5 
0.030 
<1 
<100 
30 
<1 
3 
<10 
DEC 
3... 
0.40 
1.1 
4.9 
0.130 
FEB 1986 
4... 
0.40 
1.0 
4.4 
0.040 
-- 
APR 
30... 
0.50 
2.0 
8.9 
0.080. 
<1 
<100 
30 
<1 
18 
10 
JUL 
08... 
0.30 
0.50 
2.2 
0.030 
SEP 
04... 
0.30 
0.80 
3.5 
0.080 
MANGA- 
METHY- 
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
04... 
760 
<1 
50 <0.10 
<1 
<1 
20 <0.010 
0.02 
DEC 
3... 
FEB 1986 
4... 
APR 
30... 
1600 
2 
60 <0.10 
<1 
<1 
10 <0.010 
<1 0.05 
JUL 
08... 
SEP 
04... 
237 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
238 
RIO PORTUGUES BASIN 
50115000 RIO PORTUGUES NEAR PONCE, PR 
LOCATION.--Lat 18°04'45". long 66'38'01', Hydrologic Unit 21010004, on right bank 30 ft (9 a) upstream from 
bridge on Highway 504, 0.2 mi (0.3 km) upstream from small unnamed tributary. 4.4 mi (7.1 kn) upstream from 
Rio Chiquito, and 4.7 mi (7.6 km) north of "laza Degetau in Ponce. 
DRAINAGE AREA.--8.82 mil (22.84 km 2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--February to June 1964 (monthly measurements only), July 1964 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 470 ft (143 m), from topographic map. Prior to Dec. 4, 1964, 
non-recording gage at same site and datum. 
REMARKS.--No estimated daily discharges during water year. Records fair. Some low-flow regulation due to 
unknown activity upstream. 
AVERAGE DISCHARGE.--22 years (1965-86). 18.7 ft'/s (0.530 m'/s), 28.79 in/yr (731 mm/yr), 13,550 acre-ft/yr 
(16.7 he/yr); median of yearly mean discharges, 18 ft'is (0.51 m'/s), 13,000 acre-ft/yr (16 hm)/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 21,000 ft'is (595 m'/s), Oct. 7, 1985, gage height, 
20.2 ft (6.16 m), from floodmarks at downstream side of bridge, from rating curve extended above 150 ft'/s 
(4.25 m'/s) on basis of slope-area measurement of peak flow; minimum discharge, 1.0 ft3/s (0.028 m'/s), 
May 29, 1973. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 800 ft'/s (22.6 m'/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft'/s) 
(10/s) 
(ft) (m) 
Date 
Time 
(W/s) 
(10/s) 
(ft) 
(m) 
Oct. 6 
1530 
2,990 
84.7 
9.78 2.981 
Apr. 29 
1530 
911 
25.8 
6.01 1.832 
Oct. 7 
0500 
*21,000 
595 
*20.20 6.157 
Apr. 30 
1730 
1,220 
34.6 
6.72 2.048 
Oct. 26 
1815 
1,120 
31.7 
6.50 1.981 
May 13 
0630 
1,940 
54.9 
8.15 2.484 
Oct. 29 
2345 
805 
22.8 
5.77 1.759 
May 13 
2200 
2,660 
75.3 
9.31 2.838 
Oct. 30 
1400 
1,000 
28.3 
6.20 1.890 
July 31 
1800 
1,230 
34.8 
6.74 2.054 
Nov. 6 
1415 
1,420 
40.2 
7.16 2.182 
Minimum discharge, 2.8 ft'is (0.079 10/s), Apr. 27. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
18 
79 
18 
11 
5,5 
4.5 
4.3 
57 
16 
8.8 
46 
65 
2 
17 
60 
18 
11 
5.5 
4.2 
4.2 
23 
15 
9.0 
17 
26 
3 
16 
72 
18 
8.0 
5.9 
4.4 
20 
22 
19 
9.1 
15 
14 
4 
15 
51 
17 
7.9 
8.3 
4.3 
26 
15 
18 
8.0 
13 
12 
5 
17 
40 
17 
7.7 
9.5 
4.3 
12 
13 
16 
8.1 
33 
9.8 
6 
559 
187 
16 
7.2 
5.9 
4.2 
6.8 
13 
15 
6.6 
12 
9.1 
7 
1450 
91 
16 
7.1 
6.5 
4.1 
4.7 
51 
12 
6.3 
48 
8.5 
8 
257 
57 
14 
6.9 
5.6 
4.0 
27 
52 
14 
6.8 
60 
8.5 
9 
95 
45 
14 
7.9 
5.4 
4.0 
19 
29 
12 
11 
16 
7.8 
10 
61 
38 
14 
8.4 
5.4 
3.9 
6.4 
55 
12 
18 
12 
7.5 
11 
47 
32 
13 
6.9 
5.4 
4.1 
4.8 
142 
26 
36 
10 
7.1 
12 
36 
41 
13 
6.7 
4.9 
4.6 
4.2 
60 
15 
63 
8.7 
7.0 
13 
29 
32 
13 
6.6 
4.9 
4.1 
4.0 
500 
12 
77 
8.7 
6.8 
14 
27 
27 
13 
6.4 
5.0 
4.5 
3.8 
250 
10 
97 
8.6 
6.8 
15 
21 
30 
12 
6.3 
4.8 
4.0 
3.8 
78 
10 
69 
8.3 
6.6 
16 
17 
43 
12 
6.2 
4.7 
4.0 
3.7 
46 
11 
30 
7.4 
6.6 
17 
15 
42 
12 
6.0 
4.8 
4.0 
3.7 
30 
10 
23 
7.1 
6.4 
18 
21 
71 
11 
6.0 
4.8 
5.0 
3.5 
25 
11 
25 
7.1 
6.2 
19 
13 
46 
11 
5.9 
6.9 
4.2 
3.5 
20 
13 
25 
6.9 
6.0 
20 
12 
34 
13 
6.0 
11 
3.9 
3.4 
16 
13 
26 
6.9 
7.0 
21 
13 
28 
12 
6.0 
5.4 
3.8 
3.6 
13 
14 
21 
6.8 
6.8 
22 
11 
25 
13 
5.6 
5.0 
3.7 
3.5 
12 
11 
19 
7.2 
6.0 
23 
88 
24 
12 
5.6 
4.5 
3.6 
3.3 
12 
11 
18 
10 
5.7 
24 
89 
21 
13 
5.6 
4.7 
.3.6 
3.3 
11 
11 
35 
10 
6.5 
25 
64 
20 
12 
6.2 
4.8 
3.7 
3.2 
11 
11 
24 
17 
6.5 
26 
136 
18 
12 
7.2 
4.4 
3.5 
3.2 
14 
9.1 
18 
14 
6.6 
27 
80 
18 
11 
5.5 
4,5 
3.4 
3.0 
13 
10 
20 
11 
22 
28 
65 
18 
11 
5.7 
4.5 
3.4 
8.6 
13 
11 
21 
11 
12 
29 
66 
18 
11 
7.8 
---
8.4 
101 
32 
11 
18 
46 
6.9 
30 
270 
18 
11 
8.8 
5.2 
150 
21 
14 
84 
21 
5.6 
31 
122 
---
11 
8.1 
3.9 
---
28 
---
144 
44 
---
TOTAL 
3747 
1326 
414 
218.2 
158.5 
130.5 
451.5 
1677 
393.1 
984.7 
549.7 
319.3 
MEAN 
121 
44.2 
13.4 
7.04 
5.66 
4.21 
15.1 
54.1 
13.1 
31.8 
17.7 
10.6 
MAX 
1450 
187 
18 
11 
11 
8.4 
150 
500 
26 
144 
60 
65 
MIN 
11 
18 
11 
5.5 
4.4 
3.4 
3.0 
11 
9.1 
6.3 
6.8 
5.6 
CFSM 
13.7 
5.01 
1.52 
.80 
.64 
.48 
1.71 
6.13 
1.49 
3.61 
2.01 
1.20 
IN. 
15.80 
5.59 
1.75 
.92 
.67 
.55 
1.90 
7.07 
1.66 
4.15 
2.32 
1.35 
AC-FT 
7430 
2630 
821 
433 
314 
259 
896 
3330 
780 
1950 
1090 
633 
CAL YR 1985 TOTAL 10204.1 
MEAN 
28.0 
MAX 
1450 
MIN 
2.4 
CFSM 3.17 
IN. 
43.04 
AC-FT 
20240 
WTR YR 1986 TOTAL 10369.5 
MEAN 
28.4 
MAX 
1450 
MIN 
3.0 
CFSM 3.22 
IN. 
43.74 
AC-FT 
20570 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
RIO PORTUGUES BASIN 
50115000 RIO PORTUGUES NEAR PONCE, PR--Continued 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1964 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) (DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
04... 
1000 
15 
260 
8.50 
24.0 
1.7 
8.1 
97 
<10 
K160 
140 
DEC 
3... 
0930 
18 
318 
8.50 
22.0 
0.70 
8.6 
100 
<10 
73 
69 
FEB 1986 
4... 
1340 
6.3 
317 
8.60 
23.0 
0.30 
8.4 
98 
23 
60 
86 
APR 
11... 
1230 
5.1 
300 
8.40 
25.5 
1.5 
8.4 
105 
22 
350 
50 
JUL 
08... 
0930 
5.8 
297 
8.20 
24.5 
1.2 
9.6 
117 
<10 
56 
38 
SEP 
04... 
0950 
12 
260 
8.15 
24.0 
1.5 
8.8 
107 
<10 
330 
550 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
RAR)- NONCARB CALCIUM SLUM, SODIUM, 
AD- 
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
04... 
130 
10 
40 
6.9 
9.5 
0.4 
1.3 
118 
<0.5 
8.3 
DEC 
3... 
128 
FEB 1986 
04.., 
134 
APR 
11... 
130 
14 
42 
7.3 
11 
0.4 
1.4 
121 
<0.5 
10 
9.3 
JUL 
08... 
136 
SEP 
4... 
120 
4 
37 
6.5 
9.0 
0.4 
1.4 
115 
7.8 
7.4 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
04... 
4 
0.990 
0.010 
1.00 
0.020 
0.18 
DEC 
3... 
4 
<0.010 
1.10 
<0.010 
FEB 1986 
4... 
3 
<0.010 
0.900 
0.020 
0.38 
APR 
11... 
0.10 
20 
170 
2.4 
9 
<0.010 
1.4G 
0.330 
0.27 
JUL 
08... 
4 
- 
<0.010 
0.700 
0.030 
0.27 
SEP 
04... 
0.10 
20 
160 
4.9 
1 
<0.010 
1.00 
<0.010 
K = non-ideal count 
239 
 
 
 
 
 
    
    
 
          
         
      
 
      
 
 
    
  
        
          
        
          
 
           
240 
RIO PORTUGUES BASIN 
50115000 RIO PORTUGUES NEAR PONCE, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, ,ADMIUM !CUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
04... 
0.20 
5.3 
0.030 
<1 
<100 
20 
<1 
1 
<10 
DEC 
3... 
0.30 
6.2 
0.040 
--
FEB 1986 
4... 
0.40 
5.8 
0.040 
APR 
11... 
0.60 
8.9 
0.070 
<1 
<100 
20 
<1 
7 
<10 
JUL 
08... 
0.30 
4.4 
0.050 
SEP 
04... 
0.40 
1.4 
6.2 
0.050 
--
MANGA-
METHY-
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
04... 
160 
2 
20 
<0.10 
<1 
<1 
<10 
<0.010 
2 
0.03 
DEC 
3... 
FEB 1986 
4... 
APR 
11... 
100 
3 
10 
<0.10 
<1 
<1 
30 
<0.010 
<1 
0.04 
JUL 
08... 
SEP 
04... 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
 
 
 
 
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO PORTUGUES BASIN 
50116200 RIO PORTUGUES AT PONCE, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°00'20", long 66°36'28", 1,300 ft (400 m) south of Las Americas Avenue Bridge, 1.2 mi (1.9 km) 
south of CSC 50115900, 0.8 mi (1.3 km) west of Highways 1 and 2 junction, and 0.7 mi (1.1 km) southeast of Ponce. 
DRAINAGE AREA.--18.9 sq mi (49.0 sq km). 
PERIOD OF RECORD.--Water years 1979 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COL1- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
NOV 1985 
02... 
1535 
45 
540 
8.10 
30.0 220 
7.0 
94 
37 K130000 
4100 
DEC 
2... 
1740 65 
546 7.90 27.5 3.2 
7.8 100 
14 K18000 9000 
FEB 1986 
25... 
1415 
4.2 
686 
7.60 
31.0 
14 
8.6 
116 
30 
APR 
30... 
1300 
26 
336 
8.00 
30.5 97 
7.4 
99 
61 K170000 K19000 
JUL 
07... 
1435 
4.9 
525 
7.55 
34.0 
4.2 
8.1 
115 
24 
K6400 
K160 
SEP 
3... 
1555 
15 
343 
8.25 
34.0 
60 
7.6 
108 
<10 
26000 
9000 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM 
POTAS- LINITY 
CHLO- 
HARD- 
NESS 
NONCARB 
WATER 
CALCIUM 
DIS- 
SIUM, 
DIS- 
SODIUM, 
DIS- 
AD- 
SORP- 
SLUM, 
DIS- 
WATER 
TOTAL 
SULFIDE 
SULFATE 
DIS- 
RIDE, 
DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED . SOLVED 
DATE 
AS 
'MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
NOV 1985 
02... 
200 
26 
59 
12 
24 
0.8 
2.2 
171 
<0.5 
32 
27 
DEC 
02... 
152 
FEB 1986 
25... 
174 
APR 
30... 
120 
0 
35 
7.4 
20 
0.8 
2.1 
118 
<0.5 
20 
18 
JUL 
07... 
164 
SEP 
03... 
130 
0 
38 
7.6 
24 
1 
2.0 
126 
31 
19 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
NOV 1985 
2... 
0.10 
23 
280 
34 
558 
2.03 
0.070 
2.10 
0.440 
0.96 
DEC 
02. . 
6 
2.16 
0.040 
2.20 
0.190 
0.41 
FEB 686 
25... 
25 
1.46 
0.040 
1.50 
0.090 
0.41 
APR 
30... 
0.10 
17 
190 
13 
194 
1.75 
0.050 
1.80 
0.400 
0.60 
JUL 
07... 
10 
1.03 
0.070 
1.10 
0.200 
0.80 
SEP 
3... 
0.20 
20 
220 
8.6 
39 
0.550 
0.050 
0.600 
0.230 
0.67 
K = non-ideal count 
241 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
  
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
RIO PORTUGUES BASIN 
50116200 RIO PORTUGUES AT PONCE. PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC 
GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
NOV 1985 
02... 
1.4 
3.5 
15 
0.530 
1 
200 
80 
<1 
27 
50 
DEC 
2... 
0.60 
2.8 
12 
0.110 
FEB 1986 
25... 
0.50 
2.0 
8.9 
0.140 
APR 
30... 
1.0 
2.8 
12 
0.330 
<1 
100 
50 
1 
18 
30 
JUL 
07... 
1.0 
2.1 
9.3 
0.190 
SEP 
3... 
0.90 
1.5 
6.6 
0.260 
MANGA- 
METHY- 
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
NOV 1985 
02... 
21000 
14 720 0.10 
<1 
<1 100 <0.010 
2 <0.01 
DEC 
02... 
FEB 1986 
25... 
APR 
30... 
8800 
14 290 <0.10 
<1 
<1 
10 <0.010 
1 0.05 
JUL 
07... 
- 
SEP 
03...
-- 
PESTICIDE ANALYSES 
CHLOR- 
DI- 
DI- 
PCB, ALDRIN, DANE, DOD, DDE, DDT, AZINON, ELDRIN 
DATE 
TIME 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
07... 
1435 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.03 <0.010 
HEPTA- 
METH- 
ENDO- 
HEPTA- CHLOR 
MALA- OXY- 
SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, 
DATE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UC/L) 
JUL 1986 
07... 
<0.010 <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 
NAPH- 
THA- 
METHYL METHYL 
LENES, 
PARA- 
TRI- 
PARA- 
POLY- 
PER- 
TOX- 
TOTAL 
THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI-
DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
07... 
<0.01 
<0.01 
<0.01 
<0.01 
<0.10 
<0.1 
<1 
<0,01 
242 
  
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
  
 
243 
RIO GUAYANILLA BASIN 
50124200 RIO GUAYANILLA NEAR GUAYANILLA, PR 
LOCATION.--Lat 18°02'40", long 66°47'53', Hydrologic Unit 21010004, on left bank, 0.7 mi (1.1 km) north of junction 
of Highways 2 and 132, 0.6 mi (1.0 km) downstream from Quebrada Consejo, 1.8 mi (2.9 km) north-northwest from 
Plaza de Guayanilla. 
DRAINAGE AREA.--18.9 mil (49.0 km 2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--March 1981 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 80 ft (24 m) from topographic map. 
REMARKS.--Estimated daily discharges: Oct. 6, 7 and July 12 to Aug. 13. Records fair except those for estimated 
daily discharges, which are poor. 
AVERAGE DISCHARGE.--5 years (1982-86), 22.9 ft'is (0.648 m'/s), 16.45 in/yr (418 mm/yr), 16,590 acre-ft/yr 
(20.4 he/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 14,700 ft'is (416 m'/s), Sept. 12, 1982, gage height, 20.4 ft 
(6.21 m), from floodmarks, from rating curve extended above 100 ft'/s (2.83 m 3 /s) on basis of step-backwater 
analysis and indirect measurement of peak flow; minimum discharge, 1.8 ft'/s (0.051 11,/s), Apr. 17-19, 1981. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 800 ft'is (22.7 leis) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft'/s) 
(0/s) 
(ft) 
(m) 
Date 
Time 
(W/s) (10/s) 
(ft) 
(m) 
Oct. 7 
0445 
*11,900 
337 
*19.13 5.831 
May 13 
2145 
1,300 
36.8 
10.35 3.155 
Oct. 23 
1715 
961 
27.2 
9.66 2.944 
May 29 
2100 
961 
27.2 
9.66 2.944 
Oct. 30 
1330 
1,000 
28.3 
9.75 2.972 
Sept.27 
1545 
918 
26.0 
9.56 2.914 
May 13 
0630 
1,340 
37.9 
10.43 3.179 
Minimum discharge, 3.8 ft'/s (0.108 m',/s), Mar. 11, 12. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
HOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
19 
138 
22 
10 
6.4 
4.7 
4.3 
18 
18 
6.6 
44 
16 
2 
15 
109 
21 
9.7 
6.3 
4.5 
4.4 
7.7 
14 
6.6 
14 
10 
3 
17 
113 
20 
9.7 
6.6 
4.5 
17 
6.9 
13 
6.3 
11 
7.7 
4 
17 
92 
20 
9.7 
7.3 
4.5 
68 
7.3 
12 
7.4 
9.0 
6.8 
5 
19 
82 
20 
9.3 
9.1 
4.5 
18 
7.6 
11 
7.1 
32 
6.6 
6 
600 
89 
20 
8.9 
6.8 
4.3 
9.2 
5.6 
9.7 
7.4 
10 
6.0 
7 
1500 
129 
19 
9.0 
6.8 
4.1 
6.8 
10 
9.7 
6.6 
46 
5.6 
8 
401 
115 
18 
9.1 
6.6 
4.3 
6.1 
16 
9.5 
6.3 
56 
5.4 
9 
156 
83 
17 
8.6 
6.3 
4.3 
5.9 
7.9 
9.0 
6.0 
16 
5.1 
10 
89 
71 
17 
9.8 
6.3 
4.1 
5.6 
30 
9.5 
6.0 
10 
4.9 
11 
65 
65 
17 
8.6 
6.1 
4.0 
5.6 
100 
12 
6.0 
8.0 
6.6 
12 
51 
84 
17 
8.9 
6.0 
4.1 
5.2 
19 
11 
6.6 
6.6 
5.6 
13 
64 
60 
15 
9.3 
5.8 
4.5 
5.0 
468 
8.6 
70 
5.9 
5.4 
14 
54 
48 
16 
9.3 
5.6 
5.5 
4.9 
274 
8.6 
90 
30 
5.1 
15 
40 
35 
15 
9.0 
5.6 
4.3 
4.9 
51 
8.2 
65 
10 
4.9 
16 
35 
53 
15 
9.0 
5.6 
4.1 
4.9 
26 
8.2 
25 
6.6 
4.7 
17 
34 
81 
14 
9.0 
5.6 
4.1 
5.0 
20 
7.9 
20 
6.3 
4.5 
18 
70 
F7 
14 
9.0 
5.6 
4.1 
5.1 
18 
7.4 
25 
6.0 
4.5 
19 
33 
39 
14 
8.8 
5.6 
4.2 
4.9 
17 
7.4 
27 
5.8 
4.3 
20 
29 
34 
13 
8.9 
7.4 
4.3 
4.6 
15 
7.3 
30 
5.6 
7.2 
21 
27 
31 
13 
9.0 
5.8 
4.2 
4.7 
14 
7.0 
18 
5.1 
50 
22 
27 
29 
13 
8.7 
5.1 
4.1 
4.7 
13 
7.2 
16 
10 
7.4 
23 
210 
29 
13 
8.4 
4.8 
4.1 
4.6 
13 
7.9 
15 
23 
5.6 
24 
184 
28 
12 
8.3 
4.7 
4.2 
4.3 
12 
8.3 
35 
9.0 
4.9 
25 
154 
26 
12 
9.0 
4.7 
4.5 
4.3 
13 
7.7 
18 
5.1 
4.9 
26 
144 
24 
12 
9.3 
4.7 
4.3 
4.3 
16 
7.7 
13 
4.7 
116 
27 
183 
24 
11 
8.2 
4.7 
4.1 
4.3 
15 
8.0 
16 
4.1 
221 
28 
266 
23 
11 
7.8 
4.7 
4.0 
5.2 
16 
7.7 
21 
4.0 
86 
29 
142 
23 
11 
18 
---
4.8 
7.9 
135 
7.1 
13 
8.6 
26 
30 
355 
23 
10 
7.6 
---
4.9 
39 
38 
6.3 
76 
5.4 
52 
31 
244 
---
10 
6.8 
4.2 
---
42 
---
130 
87 
---
TOTAL 
5244 
1837 
473 
284.7 
166.6 
134.4 
278.7 
1452.0 
276.9 
801.9 
504.8 
700.7 
MEAN 
169 
61.2 
15.3 
9.18 
5.95 
4.34 
9.29 
46.8 
9.23 
25.9 
16.3 
23.4 
MAX 
1500 
138 
22 
18 
9.1 
5.5 
68 
468 
18 
130 
87 
221 
MIN 
15 
23 
10 
6.8 
4.7 
4.0 
4.3 
5.6 
6.3 
6.0 
4.0 
4.3 
CFSM 
8.94 
3.24 
.81 
.49 
.31 
.23 
.49 
2.48 
.49 
1.37 
.86 
1.24 
IN. 
10.32 
3.62 
.93 
.56 
.33 
.26 
.55 
2.86 
.55 
1.58 
.99 
1.38 
AC-FT 
10400 
3640 
938 
565 
330 
267 
553 
2880 
549 
1590 
1000 
1390 
CAL YR 1985 TOTAL 
12871.1 
MEAN 
35.3 
MAX 
1500 
MIN 
2.9 
CFSM 1.81 
IN. 
25.33 
AC-FT 
25530 
WTR YR 1986 TOTAL 
12154.7 
MEAN 
33.3 
MAX 
1500 
MIN 
4.0 
CFSM 1.76 
IN. 
23.92 
AC-FT 
24110 
 
 
         
 
    
 
      
 
 
 
 
 
 
  
 
         
           
         
 
 
 
 
 
     
         
 
 
          
         
          
     
    
          
 
     
          
244 
RIO GUAYANILLA BASIN 
50124700 RIO GUAYANILLA AT CENTRAL RUFINA, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°00'40", long 66°46'49", at dirt road bridge, 0.7 mi (1.1 km) from mouth, 0.9 mi (1.4 km) east of 
Central Rufina and 0.9 mi (1.4 km) southeast of Guayanilla. 
DRAINAGE AREA.--22.8 sq mi (59.1 sq km). 
PERIOD OF RECORD.--Water years 1960-65, 1974 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) 
(MG/L) 
100 ML) 100 ML) 
OCT 1985 
03... 
1650 
9.0 
423 
8.30 
30.0 
7.0 
6.4 
16 
520000 
35000 
DEC 
6... 
L150 
13 
523 
8.40 
27.5 
2.4 
7.8 
99 
13 
K65000 
K11000 
FEB 1986 
7... 
1030 
2.8 
873 
1.50 
26.5 
2.7 
0 
79 
23000 
K120000 
MAY 
01... 
0925 
27 
318 
7.80 
23.5 
23 
8.2 
97 
17 
K5000 
4000 
JUL 
09... 
0905 
1.7 
808 
7.50 
27.5 
2.8 
1.2 
15 
39 
35000 
K5500 
SEP 
05... 
0915 
2.0 
705 
7.65 
28.0 
1.7 
4.0 
51 
12 
K9900 
K1000 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD-
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLU 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
03... 
170 
33 
44 
14 
22 
0.8 
2.6 
135 
<0.5 
46 
22 
DEC 
6... 
FEB 1986 
7... 
266 
MAY 
01... 
120 
12 
32 
9.4 
11 
0.5 
1.8 
107 
<0.5 
25 
13 
JUL 
09... 
267 
SEP 
05... 
280 
32 
76 
21 
43 
1 
4.1 
244 
73 
44 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
03... 
0.10 
19 
250 
6.1 
1. 
C.070 
0.030 
0.100 
1.60 
0.70 
DEC 
6... 
5 
0.740 
0.060 
0.800 
1.70 
0.30 
FEB 1986 
7... 
11 
0.380 
0.120 
0.500 
13.0 
MAY 
01... 
<0.10 
14 
170 
13 
37 
1.17 
0.030 
1.20 
0.760 
0.44 
JUL 
09... 
6 
0.160 
(.04C 
0.200 
5.50 
3.6 
SEP 
05... 
0.10 
23 
430 
2.3 
1 
0.350 
0.050 
0.400 
5.40 
2.4 
K = non-ideal count 
 
 
    
    
 
          
         
  
 
       
 
 
          
        
 
 
   
 
 
   
   
 
 
 
         
 
 
 
 
        
 
 
  
    
        
245 
RIO GUAYANILLA BASIN 
50124700 RIO GUAYANILLA AT CENTRAL RUFINA, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
03... 
2.3 
2.4 
11 
0.640 
1 
<100 
30 
<1 
5 
10 
DEC 
06... 
2.0 
2.8 
12 
0.410 
FEB 1986 
07... 
2.20 
--
MAY 
01... 
1.2 
2.4 
11 
0.250 
2 
100 
40 
<1 
12 
10 
JUL 
09... 
9.1 
9.3 
41 
1.80 
SEP 
05... 
7.8 
8.2 
36 
1.70 
MANGA-
METHY-
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, 
RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/.L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
03... 
4 
80 0.20 
<1 
<1 
20 <0.010 
2 0.35 
DEC 
6... 
FEB 1986 
7... 
MAY 
01... 
2200 
1 100 <0.10 
<1 
<1 
30 <0.010 
<1 0.07 
JUL 
09... 
--
SEP 
05... 
PESTICIDE ANALYSES 
CHLOR-
DI-
DI-
PCB, ALDRIN, DANE, ODD, DOE, DDT, AZINON, ELDRIN 
DATE 
TIME 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
09... 
0905 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.07 <0.010 
DATE 
HEPTA-
METH-
ENDO-
HEPTA- CHLOR 
MALA- OXY-
SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
09... 
<0.010 <0.010 <0.01 <0.010 <0.010 <0.010 0.02 <0.01 
NAPH-
THA-
METHYL METHYL 
LENES, 
PARA-
TRI-
PARA-
POLY-
PER-
TOX-
TOTAL 
THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI­
DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
09... 
<0.01 
<0.01 
<0.01 
<0.01 
<0.10 
<0.1 
<1 
<0.01 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
  
 
  
 
 
 
  
 
  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
  
 
 
 
 
  
 
  
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
RIO LOCO BASIN 
50129700 RIO LOCO AT GUANICA. PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 17°58'33", long 66'54'52", 0.6 mi (1.0 km) northwest of Guanica and 1.2 mi (1.9 km) northeast of 
Ensenada. 
DRAINAGE AREA.--Indeterminate. 
PERIOD OF RECORD.--Water years 1975 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN 
COLT - 
STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) (US/CM) UNITS) (DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
03... 
1215 370 
284 8.10 26.0 53 
<10 K14000 600 
DEC 
6... 
0920 
663 
8.20 
24.0 
17 
7.2 
15 
K450 
K910 
FEB 1986 
7... 
1230 
21100 
7.40 
27.0 
0.50 
0 
190 
2000 
2000 
MAY 
01... 
1235 
9100 
7.60 
26.0 
19 
3.2 
41 
120 
K9500 
6500 
JUL 
09... 
1120 
7200 
7.85 
30.0 
7.8 
5.4 
73 
/9 
370 
270 
SEP 
05... 
1120 
6750 
7.55 
30.0 
4.6 
4.0 
54 
310 
600 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD- 
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
T1ON 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
03... 
110 
6 
26 
10 
11 
0.5 
2.1 
100 
<0.5 
12 
9.6 
DEC 
06...
192 
FEB 196 
07... 
233 
7500 
MAY 
01... 
1000 
850 
80 
200 
1500 
21 
52 
178 
<0.5 
410 
2700 
JUL 
09... 
288 
2300 
SEP 
05... 
840 
580 
90 
150 
1200 
18 
41 
267 
340 
2100 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+1403 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
03... 
<0.10 
17 
150 
148 
15 
0.790 
0.010 
0.800 
0.040 
0.46 
DEC 
6... 
26 
1.28 
0.020 
1.30 
0.040 
0.46 
FEB 1986 
7... 
30 
0.480 
0 020 
0.500 
0.180 
0.62 
MAY 
01... 
0.30 
17 
5100 
25 
0.380 
0 020 
0.400 
0.060 
0.54 
JUL 
09... 
-- 
7 
0.380 
0.020 
0.400 
0.130 
0.47 
SEP 
05... 
0.30 
27 
4100 
13 
0.290 
0.010 
0.300 
0.080 
0.52 
K = non-ideal count 
E = estimate 
246 
 
 
    
    
 
          
         
          
   
   
          
    
   
  
 
        
          
        
  
   
 
 
    
   
 
 
 
         
 
 
 
 
        
 
  
    
        
247 
RIO LOCO BASIN 
50129700 RIO LOCO AT GUANICA, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(KG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
03... 
0.50 
1.3 
5.8 
0.080 
<1 
<100 
20 
<1 
30 
30 
DEC 
6... 
0.50 
1.8 
8.0 
0.090 
FEB 1986 
7... 
0.80 
1.3 
5.8 
0.130 
MAY 
01... 
0.60 
1.0 
4.4 
0.170 
1 
100 
660 
1 
19 
20 
JUL 
09... 
0.60 
1.0 
4.4 
0.140 
SEP 
5... 
0.60 
0.90 
4.0 
0.090 
MANGA-
METHY-
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
03... 
4900 
12 170 0.90 
<1 
<1 
20 <0.010 
0.04 
DEC 
6... 
FEB 1986 
7... 
MAY 
01... 
890 
1 
90 <0.10 
<1 
<1 
20 <0.010 
<1 0.31 
JUL 
09... 
SEP 
05... 
PESTICIDE ANALYSES 
CHLOR-
DI-
DI-
PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN 
DATE 
TIME 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
09... 
1120 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.01 <0.010 
HEPTA-
METH-
ENDO-
HEPTA- CHLOR 
MALA- OXY-
SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, 
DATE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TCTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
09... <0.010 <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 
NAPH-
THA-
METHYL METHYL 
LENES, 
PARA-
TRI-
PARA-
POLY-
PER-
TOX-
TOTAL 
THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI­
DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
09... 
<0.01 
<0.01 
<0.01 
<0.01 
<0.10 
<0.1 
<1 
<0.01 
 
MAYAGUEZ 
Ycgiiez bas.in 
e 46cec, tclin 
MARICAO 
1380 
HORMtG 
III 
Dr airioge boundary 
Mond 
divode 
Rfo Youco 
basin 
A 
ROJO 
SAN GERMAN 
Rill Loco Cosier 
Map area 
Bocturron 
1299,129899 
Drainage boundary 
EXPLANATION 
1380 SURFACE—WATER STATION 
AND NUMBER 
7 QUALITY—OF—WATER STATION
129
AND NUMBER 
0143 WELL AN WELL NUMBER 
Coosti 
12 
ENSENADA 
GUAN1CA 
5 KILOMETERS 
1 
5 MILES 
Figure 20.--Southeastern river basins--Rio Humacao to Rio Seco basins. 
I
I
I
250 
LAGUNA CARTAGENA BASIN 
50129899 LAGUNA CARTAGENA NEAR BOQUERON, PR 
LOCATION.--Lat 18°00'52*, long 67°06'33". Hydrologic Unit 21010004, on right bank, 0.6 i (1.0 km) south of 
Hacienda Desenganci, and 4.3 
i (6.9 km) southeast of Boqueron. 
DRAINAGE AREA.--Indeterminate. 
LAKE LEVEL RECORDS 
PERIOD OF RECORD.--June 1984 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 36 ft (11 m), from topographic ap. 
REMARKS.--Records fair. 
EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation, 15.39 ft (4.691 m), Nov. 3, 1985; minimum elevation, 
7.43 ft (2.265 m), July 29, 1985. 
EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 14.17 ft (4.319 m), Oct. 7; minimum elevation, 7.54 ft 
(2.298 m), May 4-6. 
ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS AT 2400 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
8.50 
9.56 
8.55 
8.23 
8.23 
7.86 
7.59 
7.56 
8.38 
7.67 
8.02 
8.16 
2 
8.45 
9.28 
8.52 
8.21 
8.23 
7.82 
7.60 
7.56 
8.37 
7.65 
8.02 
8.19 
3 
8.40 
9.11 
8.48 
8.21 
8.28 
7.75 
7.60 
7.55 
8.33 
7.62 
8.02 
8.20 
4 
8.35 
8.98 
8.45 
8.20 
8.28 
7.73 
7.61 
7.54 
8.25 
7.62 
7.99 
8.19 
5 
8.32 
8.87 
8.43 
8.20 
8.27 
7.70 
7.61 
7.54 
8.19 
7.62 
7.97 
8.17 
6 
9.33 
9.19 
8.41 
8.20 
8.26 
7.67 
7.62 
7.62 
8.13 
7.52 
7.95 
8.17 
7 
13.95 
10.70 
8.39 
8.20 
8.24 
7.66 
7.62 
7.59 
8.08 
7.62 
7.95 
8.19 
8 
13.38 
10.68 
8.38 
8.18 
8.22 
7.65 
7.63 
7.58 
8.03 
7.62 
7.93 
8.18 
9 
12.33 
10.10 
8.36 
8.18 
8.21 
7.63 
7.63 
7.58 
7.98 
7.61 
7.92 
8.15 
10 
11.59 
9.61 
8.35 
8.17 
8.19 
7.57 
7.63 
9.46 
7.96 
7.60 
7.92 
8.13 
11 
10.99 
9.38 
8.34 
8.17 
8.17 
7.56 
7.62 
10.64 
8.03 
7.61 
7.85 
8.11 
12 
10.35 
9.52 
8.34 
8.16 
8.15 
7.60 
7.62 
10.09 
7.99 
7.62 
7.71 
8.09 
13 
9.85 
10.56 
8.33 
8.16 
8.12 
7.89 
7.62 
13.64 
7.97 
7.58 
7.63 
8.09 
14 
9.79 
10.32 
8.31 
8.16 
8.11 
7.87 
7.62 
12.68 
7.94 
7.64 
7.70 
8.09 
15 
9.42 
9.73 
8.30 
8.19 
8.09 
7.88 
7.62 
11.60 
7.94 
7.69 
7.60 
8.09 
16 
9.12 
9.36 
8.29 
8.19 
8.08 
7.89 
7.62 
10.77 
7.93 
7.71 
7.60 
8.07 
17 
9.03 
9.20 
8.29 
8.18 
8.07 
7.91 
7.62 
10.05 
7.91 
7.80 
7.61 
8.05 
18 
9.76 
9.19 
8.29 
8.18 
8.05 
7.98 
7.61 
9.57 
7.89 
7.83 
7.62 
8.03 
19 
9.51 
9.15 
8.28 
8.17 
8.04 
7.99 
7.62 
9.29 
7.90 
7.84 
7.62 
8.02 
20 
9.21 
9.07 
8.28 
8.17 
8.03 
8.00 
7.61 
9.10 
7.88 
7.34 
7.62 
8.02 
21 
9.02 
8.99 
8.28 
8.17 
8.02 
8.00 
7.61 
8.96 
7.87 
7.84 
7.63 
8.15 
22 
8.90 
8.92 
8.29 
8.17 
8.01 
8.00 
7.61 
8.84 
7.84 
7.83 
7.65 
8.19 
23 
9.68 
8.87 
8.28 
8.17 
8.01 
8.00 
7.60 
8.75 
7.83 
7.89 
7.85 
8.14 
24 
9.96 
8.85 
8.26 
8.17 
7.98 
8.00 
7.59 
8.67 
7.82 
7.94 
7.91 
8.15 
25 
9.64 
8.83 
8.25 
8.21 
7.97 
7.99 
7.59 
8.63 
7.82 
7.91 
7.95 
8.15 
26 
9.34 
8.79 
8.23 
8.22 
7.95 
7.99 
7.59 
8.60 
7.82 
7.91 
7.95 
8.35 
27 
9.17 
8.73 
8.22 
8.23 
7.93 
7.96 
7.60 
8.54 
7.81 
7.95 
7.96 
8.84 
28 
9.10 
8.68 
8.21 
8.21 
7.91 
7.97 
7.60 
8.40 
7.78 
8.01 
7.98 
9.06 
29 
9.06 
8.63 
8.22 
8.22 
---
7.95 
7.57 
8.42 
7.76 
8.03 
8.06 
9.03 
30 
10.09 
8.59 
8.24 
8.23 
7.59 
7.57 
8.39 
7.73 
8.02 
8.09 
8.99 
31 
9.97 
---
8.24 
8.23 
7.60 
---
8.38 
---
8.02 
8.13 
---
MEAN 
9.79 
9.31 
8.33 
8.19 
8.11 
7.83 
7.61 
9.02 
7.97 
7.77 
7.85 
8.25 
MAX 
13.95 
10.70 
8.55 
8.23 
8.28 
8.00 
7.63 
13.64 
8.38 
8.03 
8.13 
9.06 
MIN 
8.32 
8.59 
8.21 
8.16 
7.91 
7.56 
7.57 
7.54 
7.73 
7.58 
7.60 
8.02 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
   
 
   
251 
LAGUNA CARTAGENA BASIN 
50129900 LAGUNA CARTAGENA OUTFLOW NEAR BOQUERON, PR 
LOCATION.--Lat 18°00'52", long 67°06'34", Hydrologic Unit 21010004, on right bank, 0.6 mi (1.0 km) south of 
Hacienda Desengano, and 4.3 mi (6.9 km) southeast of BoquerOn. 
DRAINAGE AREA.--Indeterminate. 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--June 1984 to current year. 
GAGE.--Water-stage recorder. Elevation of gage is 36 ft (11 m), from topographic map. 
REMARKS.--No estimated daily discharges during water year. Records fair. 
EXTREMES FOR PERIOD Or PECORU.--Maximum discharge, 1,290 ft,/s (36.5 e/s), Nov. 3, 1984, gage height, 15.39 ft 
(4.691 m), from rating curve extended above 50 ft'is (1.42 0/s) on basis of step-backwater analysis; no flow 
part or all of each day Mar 8-12, Mar. 31 to May 9, July 2-16, Aug. 14-22, 1986. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 60 ft3/s (1.70 m3/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft3/s) 
(m3/s) 
(ft) (m) 
Date 
Time 
(ft3/s) 
(m3/s) 
(ft) 
(m) 
Oct. 7 
1400 
*751 
21.3 
*14.17 4.319 
May 11 
1100 
74 
2.10 
10.75 
3.277 
Nov. 8 
0545 
87 
2.46 
10.95 3.338 
May 14 
0200 
594 
16.8 
13.71 
4.179 
Nov. 14 
0315 
69 
1.95 
10.65 3.246 
No flow part or all of each day Mar. 8-12, Mar. 31 to May 9, July 2-16, Aug. 14-22. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
3.6 
32 
3.8 
.93 
.93 
.09 
.00 
.00 
2.4 
.01 
.19 
.60 
2 
3.1 
21 
3.4 
.87 
.93 
.07 
.00 
.00 
2.4 
.00 
.19 
.80 
3 
2.7 
15 
3.0 
.78 
1.1 
.04 
.00 
.00 
2.1 
.00 
.19 
.95 
4 
2.2 
12 
2.7 
.76 
1.2 
.03 
.00 
.00 
1.6 
.00 
.15 
.94 
5 
1.8 
9.7 
2.4 
.78 
1.2 
.02 
.00 
.00 
1.1 
.00 
.14 
.85 
6 
3.3 
9.4 
2.1 
.78 
1.1 
.01 
.00 
.00 
.75 
.00 
.12 
.76 
7 
516 
28 
1.9 
.78 
1.0 
.01 
.00 
.00 
.44 
.00 
.11 
.83 
8 
650 
81 
1.8 
.71 
.91 
.00 
.00 
.00 
.26 
.00 
.11 
.89 
9 
371 
56 
1.7 
.67 
.82 
.00 
.00 
.00 
.17 
.00 
.10 
.80 
10 
200 
34 
1.5 
.64 
.70 
.00 
.00 
3.6 
.13 
.00 
.09 
.64 
11 
119 
22 
1.5 
.62 
.60 
.00 
.00 
67 
.17 
.00 
.08 
.53 
12 
70 
20 
1.5 
.57 
.55 
.00 
.00 
55 
.17 
.00 
.03 
.44 
13 
44 
32 
1.5 
.56 
.42 
.04 
.00 
344 
.14 
.00 
.01 
.36 
14 
31 
63 
1.3 
.54 
.31 
.09 
.00 
485 
.12 
.00 
.00 
.41 
15 
27 
41 
1.2 
.64 
.31 
.09 
.00 
229 
.11 
.00 
.00 
.39 
16 
17 
24 
1.2 
.73 
.27 
.10 
.00 
109 
.11 
.00 
.00 
.36 
17 
13 
17 
1.1 
.71 
.26 
.10 
.00 
57 
.10 
.02 
.00 
.28 
18 
15 
15 
1.1 
.67 
.24 
.16 
.00 
33 
.09 
.05 
.00 
.23 
19 
29 
14 
1.1 
.65 
.21 
.21 
.00 
22 
.08 
.05 
.00 
.21 
20 
20 
14 
1.1 
.62 
.21 
.23 
.00 
16 
.08 
.05 
.00 
.19 
21 
14 
11 
1.1 
.62 
.18 
.23 
.00 
13 
.07 
.05 
.00 
.54 
22 
11 
10 
1.1 
.62 
.19 
.23 
.00 
10 
.06 
.05 
.00 
.42 
23 
12 
8.6 
1.1 
.62 
.18 
.23 
.00 
8.2 
.05 
.07 
.01 
.24 
24 
41 
8.2 
1.1 
.62 
.16 
.23 
.00 
6.7 
.05 
.08 
.0.7 
.12 
25 
32 
7.9 
.99 
.65 
.15 
.23 
.00 
5.6 
.05 
.09 
.10 
.08 
26 
24 
7.4 
.91 
.81 
.13 
.21 
.00 
5.2 
.04 
.09 
.11 
.11 
27 
16 
6.5 
.81 
.88 
.12 
.19 
.00 
4.6 
.04 
.10 
.12 
1.1 
28 
15 
5.6 
.73 
.86 
.11 
.17 
.00 
3.4 
.04 
.14 
.13 
5.2 
29 
12 
4.9 
.80 
.84 
---
.17 
.00 
2.4 
.03 
.21 
.23 
5.2 
30 
19 
4.3 
.86 
.86 
.12 
.00 
2.6 
.02 
.20 
.31 
4.6 
31 
44 
---
.99 
.96 
.00 
---
2.5 
---
.19 
.52 
---
TOTAL 2378.7 
634.5 
47.39 
22.35 
14.49 
3.30 
.00 1484.80 
12.97 
1.45 
3.11 
29.07 
MEAN 
76.7 
21.1 
1.53 
.72 
.52 
.11 
.00 
47.9 
.43 
.05 
.10 
.97 
MAX 
650 
81 
3.8 
.96 
1.2 
.23 
.00 
485 
2.4 
.21 
.52 
5.2 
MIN 
1.8 
4.3 
.73 
.54 
.11 
.00 
.00 
.00 
.02 
.00 
.00 
.08 
CFSM 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
IN. 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 
AC-FT 
4720 
1260 
94 
44 
29 
6.5 
.00 
2950 
26 
2.9 
6.2 
58 
CAL YR 1985 TOTAL 3882.72 
MEAN 
10.6 
MAX 
650 
MIN 
.00 
CFSM 
.00 
IN. 
.00 
AC-FT 
7700 
WTR YR 1986 TOTAL 4632,13 
MEAN 
12.7 
MAX 
650 
MIN 
.00 
CFSM 
.00 
IN. 
.00 
AC-FT 
9190 
  
 
 
 
 
  
 
  
 
 
 
  
 
 
 
 
 
LAGUNA CARTAGENA BASIN 
50129900 LAGUNA CARTAGENA OUTFLOW NEAR BOQUERON, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS AUGUST 1984 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON- TEMPERA- 
STREAMFLOW, 
SPECIFIC CON- TEMPERA- 
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
DATE TIME INSTANTANEOUS DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
NOV, 12 1320 
21.4 
414 
25.0 
MAR. 05 1203 
0.02 
1100 
25.0 
DEC, 12 1207 
1.4 
504 
21.5 
252 
 
 
 
 
 
I
 
 
253 
LAGUNA JOYUDA BASIN 
50130320 QUEBRADA MAMEY AT JOYUDA, PR 
LOCATION.--Lat 18°07'51", long 67°10'09", Hydrologic Unit 21010003, 1.1 mi (1.8 km) northeast of Joyuda and 
0.3 mi (0.5 km) upstream from Laguna Joyuda. 
DRAINAGE AREA.--0.38 mil (0.98 km2 ). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--November 1985 to September 1986. 
GAGE.--Water-stage recorder. Elevation of gage is 5.77 ft (1.75 m) above mean sea level. 
REMARKS.--No estimated daily discharges during the period of record. Records fair. 
EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 12 ft'is (.340 m'is) and maximum (*): 
Discharye 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft3/s) 
(m3 /s) 
(ft) 
(m) 
Date 
Time 
(ft 3 /s) 
(m 3 /s) 
(ft) 
(m) 
Apr. 29 
1545 
13 
.368 
14.99 4.569 
May 
29 
2100 
13 
.368 
14.97 
4.563 
May 
3 
1630 
22 
.623 
15.27 4.654 
July 15 
1430 
17 
.481 
15.13 4.612 
May 
6 
2130 
40 
1.13 
15.71 4.788 
July 23 
1700 
16 
.453 
15.11 4.605 
May 
13 
0430 
64 
1.81 
16.14 4.919 
July 30 
1545 
17 
.481 
15.13 4.612 
May 
13 
2015 
*119 
3.37 
*16.85 5.136 
No flow any days. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
.06 
.04 
.02 
.01 
.00 
.08 
.32 
.08 
.20 
.26 
2 
.06 
.04 
.02 
.01 
.00 
.08 
.28 
.07 
.13 
.20 
3 
.06 
.04 
.02 
.01 
.00 
2.6 
.25 
.07 
.17 
.20 
4 
.06 
.04 
.04 
.01 
.01 
.48 
.21 
.07 
.20 
.18 
5 
.06 
.04 
.02 
.01 
.01 
.46 
.19 
.62 
.21 
.15 
6 
.06 
.04 
.02 
.01 
.00 
3.0 
.17 
.17 
.20 
.14 
7 
.06 
.04 
.02 
.01 
.00 
2.3 
.16 
1.1 
2.5 
.12 
8 
.07 
.04 
.02 
.02 
.00 
.21 
.17 
.17 
.71 
.13 
9 
.13 
.04 
.02 
.02 
.00 
.13 
.15 
.11 
.40 
.12 
10 
.07 
.04 
.02 
.02 
.00 
.64 
.16 
.09 
.36 
1.1 
11 
.07 
.03 
.02 
.02 
.00 
.39 
.42 
.09 
.29 
.22 
12 
.06 
.03 
.01 
.03 
.00 
.24 
.20 
.08 
.27 
.15 
13 
.06 
.03 
.01 
.19 
.00 
16 
.15 
.07 
.30 
.16 
14 
.06 
.03 
.01 
.07 
.00 
4.7 
.15 
.31 
.27 
.17 
15 
.06 
.03 
.02 
.03 
.00 
1.3 
.54 
1.6 
.24 
.13 
16 
.07 
.03 
.01 
.03 
.00 
.87 
.17 
.14 
.21 
.11 
17 
.07 
.03 
.01 
.05 
.00 
.75 
.14 
.45 
.20 
.10 
18 
.07 
.03 
.02 
.05 
.02 
.65 
.12 
.17 
.19 
.09 
19 
.06 
.02 
.05 
.04 
.01 
.58 
.11 
.08 
.17 
.08 
20 
.06 
.02 
.02 
.03 
.01 
.52 
.10 
.71 
.16 
1.2 
21 
.06 
.02 
.02 
.03 
.01 
.47 
.09 
.14 
.16 
.30 
22 
.06 
.02 
.02 
.03 
.01 
.42 
.08 
.08 
.18 
.14 
23 
.06 
.02 
.01 
.02 
.01 
.38 
.08 
1.5 
.30 
.11 
24 
.06 
.02 
.01 
.02 
.01 
.36 
.08 
.17 
.79 
.11 
25 
.06 
.42 
.01 
.02 
.01 
.34 
.08 
.13 
.22 
.12 
26 
.05 
.05 
.04 
.01 
.02 
.01 
.33 
.08 
.11 
.17 
.15 
27 
.06 
.05 
.02 
.01 
.02 
.01 
.30 
.09 
.22 
.14 
.16 
28 
.06 
.05 
.02 
.01 
.02 
.01 
.37 
.08 
.14 
.13 
.16 
29 
.06 
.05 
.03 
---
.01 
1.7 
1.6 
.08 
.10 
.32 
.15 
30 
.06 
.05 
.02 
.01 
.12 
.66 
.08 
1.7 
.17 
.15 
31 
---
.04 
.02 
.00 
---
.37 
---
.82 
1.3 
---
TOTAL 
1.92 
1.33 
.50 
.87 
1.96 
41.58 
4.98 
11.36 
11.26 
6.56 
MEAN 
.06 
.04 
.02 
.03 
.06 
1.34 
.17 
.37 
.36 
.22 
MAX 
.13 
.42 
.05 
.19 
1.7 
16 
.54 
1.7 
2.5 
1.2 
MIN 
.04 
.02 
.01 
.00 
.00 
.08 
.08 
.07 
.13 
.08 
CFSM 
.16 
.11 
.05 
.07 
.17 
3.53 
.45 
.97 
.95 
.58 
IN. 
.19 
.13 
.05 
.09 
.19 
4.07 
.49 
1.11 
1.10 
.64 
AC-FT 
3.8 
2.6 
.0 
1.7 
3.9 
82 
9.9 
23 
22 
13 
 
 
         
 
    
 
     
 
 
 
 
 
 
  
 
         
           
         
 
 
 
 
 
     
         
 
 
 
          
 
         
          
     
     
          
 
     
          
254 
RIO GUANAJIBO BASIN 
50133600 RIO GUANAJIBO NEAR SAN GERMAN, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°07'18", long 67°03'56", at bridge on Highway 347, 2.2 mi (3.5 km) northwest of San German. 
DRAINAGE AREA.--45.5 sq mi (117.8 sq km). 
PERIOD OF RECORD.--Water years 1979 to current year. 
WATER QUALITY DATA, WATER YEARS OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
02... 
0815 
44 
426 
8.00 
25.5 
12 
12 
5200 
510 
DEC 
5... 
0745 
28 
574 
7.90 
23.0 
5.2 
4.4 
52 
12 
K15000 
2000 
FEB 1986 
6... 
0900 
18 
709 
7.70 
21.5 
1.5 
2..0 
36 
20000 
530 
MAY 
02... 
1150 
55 
369 
7.60 
26.5 
24 
5.6 
73 
23 
K18000 
4500 
JUL 
10... 
1205 
8.2 
632 
7.75 
28.5 
3.0 
4.3 
56 
<10 
K550 
<100 
SEP 
17.,. 
1100 
5.7 
665 
7.85 
27.5 
2.2 
4.0 
51 
30 
<1000 
<1000 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM ROTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD-
SIUM, WATER 
SULFATE RIDE, 
NESS WATER OIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS 5) 
AS SO4) 
AS CL) 
OCT 1985 
02... 
200 
19 
22 
35 
12 
0.4 
1.6 
180 
<0.5 
20 
14 
DEC 
5... 
216 
FEB 1986 
6... 
241 
MAY 
02... 
160 
7 
18 
28 
12 
0.4 
2.0 
153 
<0.5 
15 
15 
JUL 
10... 
249 
32 
SEP 
17... 
250 
0 
27 
45 
42 
1 
3.5 
253 
51 
37 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO20403 AMMONIA ORGANIC 
SOLVED (MG/L D1S- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
5102) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
02... 
0.20 
33 
250 
29 
77 
0.650 
0.050 
0.700 
0.140 
0.36 
DEC 
5... 
7 
0.510 
0.090 
0.600 
0.390 
0.51 
FEB 1986 
6... 
9 
0.400 
0.100 
0.500 
1.20 
0.40 
MAY 
02... 
0.10 
29 
210 
31 
36 
0.630 
0.170 
0.700 
0.570 
0.43 
JUL 
10... 
6 
0.470 
0.130 
0.600 
1.60 
0.40 
SEP 
17... 
0.90 
36 
390 
6.1 
2 
0.500 
0.100 
0.600 
2.40 
0.80 
K = non-ideal count 
 
 
 
   
    
 
          
         
 
 
  
 
        
          
        
   
   
 
 
   
   
 
255 
RIO GUANAJIBO BASIN 
50133600 RIO GUANAJIBO NEAR SAN GERMAN, PR--Continued 
WATER QUALITY DATA, WATER YEARS OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA t 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
02... 
0.50 
1.2 
5.3 
0.300 
<1 
<100 
40 
<1 
9 
10 
DEC 
5... 
0.90 
1.5 
6.6 
0.500 
FEB 1986 
6... 
1.6 
2.1 
9.3 
1.30 
MAY 
02... 
1.0 
1.7 
7.5 
0.340 
1 
100 
50 
<1 
42 
20 
JUL 
10... 
2.0 
2.6 
12 
0.850 
SEP 
17... 
3.2 
3.8 
17 
1.80 
MANGA-
METHY-
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CH) (UG/L) 
(MG/L) 
OCT 1985 
02... 
930 
2 
0.10 
<1 
<1 
20 <0.010 
1 0.05 
DEC 
5... 
FEB 1986 
6... 
MAY 
02... 
1800 
<1 140 <0.10 
<1 
<1 
20 <0.010 
3 0.07 
JUL 
10... 
SEP 
17... 
  
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
256 
RIO GUANAJIBO BASIN 
50136000 RIO ROSARIO AT ROSARIO, PR 
LOCATION.--Lat 18°10'22", long 67°04'31", Hydrologic Unit 21010003, on left bank above low dam, 0.2 mi (0.3 km) 
below Quebrada Figueroa, 0.7 mi (1.1 km) northeast of Rosario, and 1.6 mi (8.6 km) below Quebrada Palma. 
DRAINAGE AREA.--16.4 mi 2 (42.5 km2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--January 1960 to June 1966 (gage-height records only) in files of Puerto Rico Water Resources 
Authority. June 1975 to September 1986 (discontinued). 
GAGE.--Water-stage recorder and concrete control. Elevation of gage is 230 ft (70 c), from topographic map. 
REMARKS.--Estimated daily discharges: Oct. 1-6, Nov. 13 to Dec. 12, May 16-27, June 1-9, June 17 to July 10. 
Records poor. 
AVERAGE DISCHARGE.--11 years (1976-86), 46.4 ft'/s (1.314 m'/s), 38.42 in/yr (976 mm/yr), 33,620 acre-ft/yr 
(41.4 hoO/yr); median of yearly mean discharges, 46 ft'is (1.30 10/s), 33,300 acre-ft/yr (41 hm,/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 33,800 ft'/s (957 m'/s), Sept. 16, 1975, gage height, 19.6 ft 
(5.97 m), from floodmarks, from rating curve extended above 60 ft'is (1.70 10/s) on basis of slope-area 
measurement of peak flow; minimum daily discharge, 2.4 ft'/s (0.068 10/s), June 18, 21, 1977. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft'is (42.5 10/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(m 3/s) 
(ft) 
(m) 
ate 
Time 
(W/s) 
(80/s) 
(ft) 
(m)
(ft'/s) 
s) 
Oct. 7 
0715 
*5,590 
158 
*9.26 2.822 
May 
13 
2145 
1,710 
48.4 
5.86 1.786 
Oct. 19 
1630 
1,500 
42.5 
5.58 1.701 
June 12 
1845 
2,780 
78.7 
7.05 2.149 
Oct. 28 
1445 
1,570 
44.5 
5.68 1.731 
June 15 
1645 
4,180 
118 
8.22 2.505 
Minimum discharge, 8.2 ft'is (0.232 m'/s), Apr. 13-15. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
78 
134 
32 
22 
17 
12 
10 
16 
54 
32 
100 
30 
2 
66 
118 
31 
22 
17 
11 
10 
19 
47 
30 
52 
27 
3 
78 
115 
30 
22 
19 
12 
14 
124 
44 
29 
42 
54 
4 
62 
134 
30 
22 
22 
12 
26 
167 
41 
28 
42 
33 
5 
54 
206 
30 
21 
18 
11 
15 
142 
38 
29 
37 
26 
6 
1200 
135 
30 
20 
17 
12 
11 
65 
35 
31 
34 
23 
7 
1350 
103 
28 
20 
17 
12 
10 
124 
36 
28 
46 
21 
8 
272 
92 
28 
20 
16 
14 
10 
73 
43 
28 
39 
26 
9 
203 
83 
27 
19 
15 
13 
11 
59 
38 
26 
34 
23 
10 
164 
71 
28 
20 
15 
12 
9.6 
147 
65 
24 
32 
21 
11 
120 
84 
26 
19 
15 
12 
11 
140 
177 
23 
32 
20 
12 
100 
70 
27 
19 
14 
12 
9.0 
65 
353 
22 
30 
20 
13 
87 
56 
28 
19 
15 
12 
8.5 
527 
192 
21 
44 
20 
14 
96 
50 
27 
18 
14 
12 
8.2 
309 
112 
21 
81 
20 
15 
125 
56 
27 
18 
14 
13 
8.5 
121 
506 
26 
70 
19 
16 
88 
62 
26 
17 
14 
11 
9.7 
110 
223 
32 
39 
19 
17 
74 
76 
26 
18 
14 
12 
9.0 
84 
100 
47 
35 
19 
18 
68 
62 
25 
18 
14 
15 
81 
72 
80 
29 
32 
20 
19 
237 
50 
25 
17 
20 
13 
53 
64 
62 
25 
30 
25 
20 
235 
45 
24 
17 
24 
12 
35 
56 
56 
89 
29 
39 
21 
275 
43 
24 
18 
15 
11 
21 
52 
50 
76 
27 
31 
22 
164 
41 
23 
21 
14 
11 
25 
48 
46 
32 
26 
65 
23 
166 
40 
23 
17 
13 
11 
22 
46 
42 
26 
50 
36 
24 
163 
38 
23 
17 
13 
12 
17 
43 
40 
148 
38 
31 
25 
119 
36 
23 
26 
13 
16 
16 
42 
39 
73 
47 
30 
26 
167 
35 
23 
28 
13 
12 
19 
45 
37 
43 
39 
32 
27 
342 
34 
23 
17 
12 
12 
16 
42 
37 
42 
31 
44 
28 
326 
32 
22 
17 
12 
11 
16 
100 
35 
47 
27 
43 
29 
191 
31 
22 
18 
---
11 
23 
13" 
33 
38 
27 
87 
30 
194 
31 
22 
22 
11 
18 
10 
32 
130 
28 
64 
31 
164 
---
22 
22 
11 
---
6,
.. 
---
135 
41 
---
TOTAL 
7028 
2163 
805 
611 
436 
374 
552.5 
3208 
2693 
1410 
1261 
968 
MEAN 
227 
72.1 
26.0 
19.7 
15.6 
12.1 
18.4 
103 
89.8 
45.5 
40.7 
32.3 
MAX 
1350 
206 
32 
28 
24 
16 
81 
527 
506 
148 
100 
87 
MIN 
54 
31 
22 
17 
12 
11 
8.2 
16 
32 
21 
26 
19 
CFSM 
13.8 
4.40 
1.59 
1.20 
.95 
.74 
1.12 
6.28 
5.48 
2.77 
2.48 
1.97 
IN. 
15.94 
4.91 
1.83 
1.39 
.99 
.85 
1.25 
7.28 
6.11 
3.20 
2.86 
2.20 
AC-Fl 
13940 
4290 
1600 
1210 
865 
742 
1100 
6360 
5340 
2800 
2500 
1920 
CAL YR 1985 TOTAL 
20693 
MEAN 
56.7 
MAX 
1350 
MIN 
11 
CFSM 3.46 
IN. 46.94 
AC-FT 
41040 
WTR YR 1986 TOTAL 
21509.5 
MEAN 
58.9 
MAX 
1350 
MIN 
8.2 
CFSM 3.59 
IN. 48.79 
AC-FT 
42660 
I
I
  
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
257 
RIO GUANAJIBO BASIN 
50136400 RIO ROSARIO NEAR HORMIGUEROS, PR 
LOCATION.--Lat 18°09'36", long 67°05'08", at bridge on Highway 348, 0.5 mi (0.8 km) southwest of Rosario plaza. 
DRAINAGE AREA.--18.3 i' (47.4 km'). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--October 1985 to September 1986. 
GAGE.--Water-stage recorder. Elevation of gage is 50.0 ft (15.2 m), from topographic map. 
REMARKS.--Estimated daily discharges: Oct. 7-9 and April 27 to May 8. Records fair except those for estimated 
daily discharges, which are poor. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft'is (42.5 m'/s) and aximun (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time (W/s) (0/s) (ft) (m) 
Date Time (ftgs) (20/s) (ft) (m) 
Oct. 7 
0715 
*5,880 
166 
*12.67 3.862 
June 15 
1715 
1,920 
54.4 
8.41 2.563 
Oct. 19 
1645 
1,630 
46.2 
7.94 2.420 
Minimum discharge, 8.7 ft'/s (0.246 m'/s), Apr. 15. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
77 
118 
32 
21 
18 
12 
11 
17 
49 
31 
110 
33 
2 
64 
102 
31 
22 
16 
11 
10 
19 
43 
29 
59 
29 
3 
76 
96 
30 
22 
19 
11 
13 
130 
39 
28 
45 
62 
4 
60 
135 
30 
21 
23 
12 
32 
160 
37 
28 
49 
34 
5 
53 
206 
30 
20 
18 
11 
18 
190 
35 
29 
39 
27 
6 
208 
126 
30 
20 
16 
11 
12 
66 
33 
30 
35 
23 
7 
1550 
99 
28 
19 
17 
12 
11 
120 
33 
27 
60 
23 
8 
331 
88 
28 
18 
16 
13 
11 
105 
40 
27 
43 
28 
9 
182 
80 
27 
18 
15 
12 
12 
50 
36 
25 
35 
24 
10 
147 
72 
28 
18 
15 
11 
9.8 
137 
34 
24 
32 
22 
11 
129 
86 
27 
19 
15 
11 
12 
143 
141 
24 
33 
21 
12 
105 
66 
26 
18 
14 
11 
9.6 
61 
268 
25 
29 
20 
13 
94 
57 
27 
18 
14 
11 
9.6 
500 
214 
24 
47 
20 
14 
103 
52 
26 
18 
14 
11 
9.4 
338 
100 
23 
87 
19 
15 
139 
55 
26 
17 
13 
13 
10 
135 
363 
29 
83 
18 
16 
96 
60 
25 
17 
13 
11 
11 
91 
207 
35 
42 
19 
17 
76 
75 
24 
18 
13 
12 
44 
72 
104 
56 
35 
18 
18 
67 
64 
23 
19 
13 
16 
66 
62 
78 
34 
34 
20 
19 
248 
51 
23 
17 
22 
14 
34 
54 
64 
29 
31 
26 
20 
258 
46 
23 
16 
27 
12 
21 
48 
55 
82 
29 
52 
21 
324 
44 
23 
16 
14 
12 
25 
44 
49 
95 
27 
34 
22 
159 
41 
23 
25 
13 
12 
17 
41 
45 
38 
26 
81 
23 
168 
40 
23 
18 
12 
12 
16 
38 
42 
30 
52 
30 
24 
162 
38 
23 
18 
12 
13 
18 
36 
39 
135 
40 
22 
25 
112 
37 
23 
30 
13 
18 
15 
36 
38 
81 
48 
22 
26 
175 
35 
23 
35 
13 
13 
26 
39 
36 
41 
44 
27 
27 
362 
34 
22 
19 
12 
14 
17 
36 
36 
41 
33 
37 
28 
335 
33 
22 
18 
12 
12 
17 
80 
34 
49 
28 
41 
29 
186 
32 
22 
18 
---
12 
23 
132 
32 
37 
29 
80 
30 
189 
31 
23 
23 
12 
18 
118 
31 
137 
29 
68 
31 
157 
---
22 
24 
11 
---
63 
---
142 
47 
---
TOTAL 
6392 
2099 
793 
620 
432 
379 
558.4 
3071 
2355 
1465 
1360 
980 
MEAN 
206 
70.0 
25.6 
20.0 
15.4 
12.2 
18.6 
99.1 
78.5 
47.3 
43.9 
32.7 
MAX 
1550 
206 
32 
35 
27 
18 
66 
500 
363 
142 
110 
81 
MIN 
53 
31 
22 
16 
12 
11 
9.4 
17 
31 
23 
26 
18 
CFSM 
11.3 
3.83 
1.40 
1.09 
.84 
.67 
1.02 
5.42 
4.29 
2.58 
2.40 
1.79 
IN. 
12.99 
4.27 
1.61 
1.26 
.88 
.77 
1.14 
6.24 
4.79 
2.98 
2.76 
1.99 
AC-FT 
12680 
4160 
1570 
1230 
857 
752 
1110 
6090 
4670 
2910 
2700 
1940 
WTR YR 1986 TOTAL 20504.4 MEAN 
56.2 
MAX 
1550 
MIN 
9.4 
CFSM 3.07 
IN. 
41.68 
AC-FT 
40670 
 
 
         
 
    
 
     
       
  
          
      
  
          
          
           
 
 
 
 
  
 
         
           
         
           
 
          
         
 
258 
RIO GUANAJIBO BASIN 
50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS 1979 TO CURRENT YEAR. 
PERIOD OF DAILY RECORD.--
SUSPENDED-SEDIMENT DISCHARGE: OCTOBER 1985 TO SEPTEMBER 1986 
INSTRUMENTATION.--USD-49 SEDINEMT SAMPLER SINCE OCTOBER 1985. 
REMARKS.--sediment samples were collected by a local observer once daily during low flow and more than once 
daily during high flow events for concentration and particle size analyses. Sediment samples are collected 
periodically by survey staff. 
EXTREMES FOR CURRENT YEAR. --
SEDIMENT CONCENTRATIONS: Maximum daily mean, 8,150 mg/L October 7, 1985; Minimum daily mean, 2 mg/L 
several days. 
SEDIMENT LOADS: Maximum daily, 74,700 tons (67,800 tonnes) October 7, 1985; Minimum daily, 0.05 ton 
(0.04 tonne) several days. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (NG/L) 
100 ML) 100 ML) 
OCT 1985 
02... 
1815 
51 
245 
8.00 
25.0 
10 
<10 
K1500 
600 
DEC 
4... 
1020 
30 
270 
8.50 
22.0 
1.6 
8.4 
99 
<10 
K22 
88 
FEB 1986 
5... 
1145 
18 
281 
8.40 
22.5 
2.0 
16 
K81 
75 
APR 
8... 
1400 
10 
278 
8.80 
26.0 
1.5 
11.0 
137 
17 
68 
430 
JUL 
9... 
1435 
26 
260 
8.10 
28.5 
1.2 
8.8 
114 
<10 
110 
550 
SEP 
16... 
1140 
19 
266 
8.35 
28.5 
2.0 
9.8 
128 
11 
K150 
90 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- UNITY 
CHLO-
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD-
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
02... 
110 
7 
20 
15 
6.5 
0.3 
1.5 
105 
<0.5 
8.5 
7.1 
DEC 
4... 
111 
FEB 1986 
5... 
APR 
8... 
120 
4 
24 
15 
9.4 
0.4 
1.1 
118 
<0.5 
7.7 
9.3 
JUL 
9... 
121 
SEP 
16... 
120 
0 
23 
16 
8.3 
0.3 
1.5 
130 
6.9 
7.7 
K = non-ideal count 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
  
 
 
  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
   
 
  
 
 
 
  
 
  
 
RIO GUANAJIBO BASIN 
50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
02... 
<0.10 
28 
150 
21 
3 
0.690 
0.010 
0.700 
0.030 
0.27 
DEC 
4... 
8 
<0.010 
0.800 
0.010 
0.19 
FEB 1986 
5... 
3 
<0.010 0.600 <0.010 
APR 
8... 
<0.10 
31 
170 
4.6 
4 
<0.010 
0.300 
0.010 
0.29 
JUL 
9... 
6 
<0.010 
0.400 
0.040 
0.26 
SEP 
16... 
0.10 
29 
170 
8.9 
2 
<0.010 
0.400 
0.010 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA s 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL. 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
02... 
0.30 
1.0 
4.4 
0.030 
<1 
<100 
10 
<1 
8 
10 
DEC 
4... 
0.20 
1.0 
4.4 
0.040 
FEB 1986 
5... 
0.40 
1.0 
4.4 
0.040 
APR 
8... 
0.30 
0.60 
2.7 
0.040 
<1 
<100 
30 
<1 
39 
<10 
JUL 
9... 
0.30 
0.70 
3.1 
0.050 
SEP 
16... 
<0.20 
0.050 
MANGA- 
METHY- 
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- N1UM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
02... 
4 
30 <0.10 
<1 
<1 
40 <0.010 
5 0.03 
DEC 
4... 
FEB 1986 
5... 
APR 
8... 
120 
1 
10 <0.10 
<1 
<1 
30 <0.010 
<1 0.04 
JUL 
9... 
SEP 
16... 
259 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
260 
RIO GUANAJIBO BASIN 
50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT 
SED. 
SED. 
SED. 
SEDI-
SUSP. 
SUSP. 
SUSP. 
MENT, 
FALL 
FALL 
FALL 
STREAM- SEDI- DIS- DIAM. DIAM. DIAM. 
FLOW, MENT, CHARGE, PERCENT PERCENT PERCENT 
INSTAN- SUS- SUS- FINER FINER FINER 
DATE TIME TANEOUS PENDED PENDED THAN THAN THAN 
(CFS) 
(MG/L) (T/DAY) 
.002 MM .004 MM .008 MM 
OCT 1985 
06... 
1830 
689 
2600 
4840 
24 
34 
53 
20... 
1710 
958 
2610 
6750 
19 
32 
43 
21... 
1620 
1390 
3320 
12500 
15 
22 
31 
NOV 
05... 
1755 
663 
3940 
7050 
25 
38 
53 
MAY 1986 
13... 
0728 
1030 
2720 
7530 
13 
20 
28 
SED. 
SED. 
SED. 
SED. 
SED. 
SED. 
SED. 
SUSP. 
SUSP. 
SUSP. 
SUSP. 
SUSP. 
SUSP. 
SUSP. 
FALL 
FALL 
SIEVE 
SIEVE 
SIEVE 
SIEVE 
SIEVE 
DIAM. 
DIAM. 
DIAN. 
DIAM. 
DIAM. 
DIAM. 
DIAL 
PERCENT PERCENT PERCENT PERCENT PERCENT PERCENT PERCENT 
FINER 
FINER 
FINER 
FINER 
FINER 
FINER 
FINER 
DATE 
THAN 
THAN 
THAN 
THAN 
THAN 
THAN 
THAN 
.016 MM .031 MM .062 MM .125 MM .250 MM .500 MM 1.00 MM 
OCT 1985 
06... 
68 
80 
86 
95 
98 
99 
100 
20... 
62 
75 
85 
95 
98 
99 
100 
21... 
44 
58 
67 
84 
94 
99 
99 
NOV 
05... 
69 
87 
91 
96 
99 
100 
100 
MAY 1986 
13... 
41 
56 
63 
78 
87 
92 
96 
261 
RIO GUANAJIBO BASIN 
50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued 
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
MEAN 
MEAN 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DAY 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
OCTOBER 
NOVEMBER 
DECEMBER 
1 
78 
61 
14 
119 
15 
4.8 
32 
9 
.78 
2 
66 
40 
6.9 
102 
13 
3.6 
31 
9 
.75 
3 
78 
72 
30 
96 
12 
3.1 
30 
8 
.65 
4 
62 
35 
7.2 
135 
193 
178 
30 
9 
.73 
5 
54 
10 
1.4 
206 
572 
1290 
30 
9 
.73 
6 
209 
608 
1440 
126 
70 
27 
30 
9 
.73 
7 
1550 
8150 
74700 
99 
15 
4.0 
28 
7 
.53 
8 
330 
270 
300 
88 
10 
2.4 
28 
7 
.53 
9 
185 
30 
15 
80 
10 
2.2 
27 
6 
.44 
10 
148 
39 
20 
72 
10 
1.9 
28 
6 
.45 
11 
131 
65 
29 
86 
75 
43 
27 
6 
.44 
12 
107 
15 
4.3 
66 
12 
2.1 
26 
5 
.35 
13 
97 
54 
46 
57 
10 
1.5 
27 
5 
.36 
14 
103 
90 
36 
51 
10 
1.4 
26 
5 
.35 
15 
140 
241 
226 
55 
10 
1.5 
26 
5 
.35 
16 
98 
63 
18 
60 
12 
1.9 
25 
5 
.34 
17 
78 
18 
3.8 
75 
41 
11 
24 
4 
.26 
18 
69 
15 
2.7 
64 
17 
2.9 
23 
4 
.25 
19 
247 
1030 
4100 
51 
10 
1.4 
23 
4 
.25 
20 
258 
553 
995 
46 
10 
1.2 
23 
4 
.25 
21 
324 
949 
2380 
43 
10 
1.2 
22 
4 
.25 
22 
160 
110 
59 
41 
10 
1.1 
22 
5 
.31 
23 
170 
247 
234 
40 
10 
1.1 
22 
5 
.31 
24 
162 
89 
48 
38 
10 
1.0 
22 
5 
.30 
25 
113 
30 
9 1 
37 
10 
1.0 
22 
5 
.31 
26 
176 
330 
521 
35 
9 
.85 
22 
5 
.31 
27 
362 
933 
2230 
34 
9 
.83 
22 
5 
.30 
28 
334 
766 
1610 
33 
9 
.80 
21 
5 
.30 
29 
186 
42 
24 
32 
9 
.78 
22 
4 
.24 
30 
190 
68 
71 
31 
9 
.75 
22 
4 
.24 
31 
157 
30 
13 
---
---
---
22 
4 
.24 
TOTAL 
6422 
89194.4 
2098 
1594.31 
785 
12.63 
262 
RIO GUANAJIBO BASIN 
50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued 
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY). WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
MEAN 
MEAN 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DISNARGE 
TRATION 
DISCHARGE 
DAY 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
JANUARY 
FEBRUARY 
MARCH 
1 
21 
4 
.23 
17 
3 
.15 
11 
2 
.06 
2 
22 
4 
.24 
16 
3 
.13 
11 
2 
.06 
3 
21 
4 
.24 
19 
3 
.15 
11 
2 
.06 
4 
21 
4 
.23 
23 
5 
.31 
12 
2 
.06 
5 
20 
3 
.16 
17 
3 
.15 
11 
2 
.06 
6 
19 
3 
.16 
16 
3 
.13 
11 
2 
.06 
7 
19 
3 
.15 
17 
3 
.14 
12 
2 
.06 
8 
18 
3 
.15 
16 
3 
.13 
13 
2 
.07 
9 
18 
3 
.15 
15 
2 
.08 
12 
2 
.06 
10 
18 
3 
.15 
15 
2 
.08 
11 
2 
.06 
11 
18 
3 
.15 
15 
2 
.08 
11 
2 
.06 
12 
17 
3 
.15 
14 
2 
.08 
11 
2 
.06 
13 
18 
3 
.15 
14 
2 
.08 
11 
2 
.06 
14 
17 
3 
.15 
14 
2 
.08 
11 
2 
.06 
15 
17 
3 
.14 
13 
2 
.07 
13 
3 
.11 
16 
17 
3 
.14 
13 
2 
.07 
11 
2 
.06 
17 
18 
3 
.15 
13 
2 
.07 
12 
3 
.10 
18 
18 
3 
.15 
13 
2 
.07 
16 
4 
.17 
19 
17 
3 
.14 
22 
13 
2.3 
14 
3 
.11 
20 
16 
3 
.13 
27 
11 
.98 
12 
3 
.10 
21 
16 
3 
.13 
14 
3 
.11 
12 
3 
.10 
22 
24 
10 
.83 
13 
3 
.11 
12 
3 
.10 
23 
17 
3 
.15 
12 
3 
.10 
11 
3 
.10 
24 
17 
3 
.15 
12 
3 
.10 
12 
4 
.14 
25 
30 
17 
3.5 
13 
3 
.11 
18 
6 
.29 
26 
35 
16 
2.9 
13 
3 
.11 
13 
3 
.11 
27 
18 
4 
.21 
12 
2 
.06 
14 
4 
.15 
28 
18 
3 
.15 
12 
2 
.06 
12 
2 
.06 
29 
18 
3 
.15 
---
---
11 
2 
.06 
30 
23 
5 
.31 
11 
2 
.06 
31 
23 
5 
.32 
11 
2 
.06 
TOTAL 
609 
12.11 
430 
6.09 
374 
2.73 
263 
RIO GUANAJIBO BASIN 
50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued 
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
MEAN 
MEAN 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DAY 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
JULY 
AUGUST 
SEPTEMBER 
1 
32 
7 
.59 
110 
116 
43 
33 
18 
1.6 
2 
30 
5 
.39 
59 
32 
5.1 
29 
10 
.78 
3 
29 
7 
.53 
45 
12 
1.5 
62 
51 
18 
4 
28 
7 
.53 
49 
41 
9.6 
35 
22 
2.0 
5 
29 
8 
.63 
39 
17 
1.8 
28 
7 
.51 
6 
31 
10 
.81 
35 
12 
1.1 
24 
7 
.43 
7 
28 
6 
.44 
60 
55 
15 
23 
7 
.43 
8 
28 
6 
.44 
43 
15 
1.7 
29 
9 
1.0 
9 
26 
5 
.34 
35 
10 
.95 
24 
10 
.65 
10 
24 
5 
.32 
32 
10 
.86 
22 
10 
.59 
11 
24 
5 
.32 
33 
10 
.89 
21 
9 
.51 
12 
24 
5 
.32 
29 
9 
.70 
20 
8 
.43 
13 
24 
5 
.32 
47 
33 
7.7 
20 
8 
.43 
14 
23 
5 
.31 
87 
151 
128 
19 
7 
.36 
15 
29 
9 
.83 
82 
88 
35 
19 
6 
.29 
16 
36 
22 
4.0 
42 
20 
2.3 
19 
6 
.29 
17 
56 
44 
9.9 
35 
12 
1.1 
18 
6 
.31 
18 
34 
15 
1.4 
34 
10 
.92 
21 
6 
.29 
19 
29 
10 
.78 
31 
10 
.84 
26 
9 
1.0 
20 
90 
122 
100 
30 
9 
.70 
53 
44 
12 
21 
95 
93 
35 
27 
8 
.58 
35 
10 
.92 
22 
38 
20 
2.1 
26 
8 
.56 
82 
104 
76 
23 
30 
15 
1.2 
50 
46 
20 
31 
15 
1.2 
24 
135 
279 
464 
40 
30 
3.2 
22 
10 
.59 
25 
82 
46 
15 
48 
42 
13 
22 
10 
.59 
26 
41 
10 
1.1 
44 
35 
4.2 
27 
9 
.85 
27 
41 
10 
1.1 
33 
12 
1.1 
37 
23 
5.1 
28 
49 
10 
1.3 
28 
10 
.76 
41 
27 
4.1 
29 
37 
10 
1.0 
29 
10 
.78 
80 
126 
112 
30 
137 
241 
300 
29 
10 
.78 
68 
45 
8.0 
31 
143 
197 
94 
47 
40 
10 
---
---
---
TOTAL 
1482 
1039.00 
1358 
313.72 
990 
251.25 
264 
RIO GUANAJIBO BASIN 
50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued 
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
MEAN 
MEAN 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
MEAN 
CONCEN-
SEDIMENT 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DISCHARGE 
TRATION 
DISCHARGE 
DAY 
(CFS) 
(MG/L) 
(TONS/DAY) 
(CFS) 
(MG/L) 
(TONS/DAY) 
(.FS) 
(MG/L) 
(TONS/DAY) 
APRIL 
MAY 
JUNE 
1 
11 
2 
.06 
17 
10 
.54 
54 
10 
1.3 
2 
10 
2 
.05 
19 
482 
755 
47 
8 
.93 
3 
13 
3 
.14 
130 
609 
1030 
44 
8 
.84 
4 
32 
25 
2.7 
160 
514 
1170 
41 
8 
.80 
5 
17 
9 
.44 
100 
184 
95 
38 
7 
.66 
6 
12 
5 
.16 
66 
475 
938 
35 
7 
.62 
7 
11 
4 
.12 
120 
688 
1790 
36 
7 
.62 
8 
11 
3 
.09 
105 
128 
52 
43 
10 
1.1 
9 
12 
4 
.13 
50 
40 
5.4 
38 
9 
.87 
10 
9.8 
2 
.05 
136 
190 
130 
36 
8 
.73 
11 
11 
3 
.10 
142 
174 
86 
141 
215 
213 
12 
9.5 
2 
.05 
60 
40 
6.6 
271 
900 
2170 
13 
9.5 
2 
.05 
499 
1440 
3620 
215 
338 
304 
14 
9.3 
2 
.05 
342 
711 
1080 
102 
98 
31 
15 
9.9 
2 
.05 
150 
28 
10 
362 
1100 
3570 
16 
11 
3 
.09 
104 
18 
4.4 
208 
320 
224 
17 
44 
57 
45 
84 
16 
3.1 
105 
50 
14 
18 
66 
90 
30 
73 
11 
1.8 
79 
23 
4.8 
19 
34 
35 
3.2 
65 
10 
1.5 
65 
12 
2.1 
20 
21 
30 
1.7 
57 
10 
1.3 
56 
10 
1.5 
21 
24 
30 
2.0 
52 
10 
1.2 
50 
9 
1.2 
22 
17 
25 
1.1 
49 
10 
1.1 
46 
8 
.97 
23 
16 
22 
.95 
46 
9 
.92 
43 
8 
.91 
24 
18 
25 
1.2 
43 
8 
.78 
40 
7 
.74 
25 
15 
22 
.89 
42 
8 
.78 
39 
7 
.72 
26 
25 
20 
1.4 
45 
9 
.95 
37 
7 
.68 
27 
17 
15 
.69 
42 
8 
.78 
37 
7 
.68 
28 
17 
10 
.54 
87 
95 
59 
35 
5 
.46 
29 
23 
10 
.54 
139 
175 
105 
33 
5 
.43 
30 
18 
10 
.54 
127 
99 
37 
32 
5 
.42 
31 
---
---
---
70 
15 
2.6 
---
---
---
TOTAL 
554.0 
94.08 
3221 
10990.75 
2408 
6550.08 
I
I
I 
 
 
 
 
 
    
 
    
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
265 
RIO GUANAJIBO BASIN 
50138000 RIO GUANAJIBO NEAR HORMIGUEROS, PR 
LOCATION.--Lat 18°08'36', long 67'08'57', Hydrologic Unit 21010003, at bridge on Highway 100, 1.4 i (2.3 k•) 
west of Hor•igueros, and 2.0 •i (3.2 km) downstream from Rio Rosario. 
DRAINAGE AREA.--120 •i 2 (311 km2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--Annual low-flow measurements 1959, monthly measurements April 1959 to November 1967, January 
1973 to current year. 
GAGE.--Water-stage recorder. Datum of gage is at mean sea level. Previous to Nov. 7, 1980, at site 0.3 
i 
(0.5 km) upstream at datum 7.36 ft (2,243 m) higher. 
REMARKS.--Estimated daily discharges: Oct. 7-22, Nov. 29 to Dec. 9, Dec. 22 to Jan. 7, Feb. 1, 2, Aug. 13, 14 and 
June 17 to July 14. Records fair except those for estimated daily discharges, which are poor. 
AVERAGE DISCHARGE.--13 years (1974-86), 218 ft'/s (6.174 m'/s), 24.67 in/yr (627 mm/yr), 157.900 acre-ft/yr 
(195 hmYyr); median of yearly mean discharges, 210 ft'is (5.95 m'/s), 152,000 acre-ft/yr (187 hmYyr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 128,000 ft'/s (3,620 m'/s), Sept. 16, 1975, gage height, 
28.50 ft (8.687 •), site and datum then in use, fro rating curve extended above 100 ft'is (2.83 m'./s) on the 
basis of contracted-opening measurement of peak flow; minimum discharge, 4.6 ft'is (0.130 •'/s), June 22, 1977. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft'is (56.6 m'/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date Time 
(W/s) (•'/s) (ft) (m) 
Date Time (W/s) (•'/s) (ft) (m) 
Oct. 7 
unknown 
*40,000 
1,133 
*28.00 8.534 
May 14 
0630 
7,680 
217 
22.89 6.977 
Minimum discharge. 5.0 ft'is (0.142 m'/s), Apr. 3, 15-17. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
167 
643 
110 
47 
60 
18 
9.8 
345 
186 
66 
391 
182 
2 
134 
498 
105 
49 
55 
16 
8.7 
254 
155 
60 
180 
177 
3 
119 
421 
100 
48 
47 
17 
30 
400 
143 
60 
144 
140 
4 
159 
672 
98 
45 
52 
24 
91 
324 
130 
62 
207 
140 
5 
152 
716 
96 
43 
47 
20 
63 
279 
117 
85 
201 
101 
6 
624 
507 
94 
41 
38 
17 
45 
299 
105 
66 
117 
86 
7 
5000 
464 
92 
41 
35 
17 
34 
490 
96 
59 
129 
77 
8 
10000 
377 
90 
40 
32 
21 
28 
312 
90 
55 
163 
68 
9 
2000 
310 
90 
39 
31 
22 
29 
188 
89 
52 
118 
68 
10 
1150 
281 
87 
39 
29 
18 
22 
548 
76 
50 
103 
74 
11 
800 
324 
83 
38 
28 
17 
18 
968 
286 
48 
90 
83 
12 
630 
287 
81 
36 
27 
16 
15 
351 
375 
43 
80 
59 
13 
530 
326 
79 
36 
26 
22 
12 
2720 
640 
43 
74 
55 
14 
600 
253 
79 
36 
26 
38 
8.7 
4890 
208 
42 
86 
49 
15 
840 
214 
81 
35 
26 
27 
8.2 
1490 
466 
54 
301 
48 
16 
540 
216 
79 
35 
25 
22 
10 
622 
679 
65 
123 
47 
17 
420 
244 
79 
36 
27 
19 
8.3 
412 
197 
71 
94 
47 
18 
390 
266 
77 
35 
27 
30 
93 
297 
149 
88 
82 
47 
19 
1750 
217 
75 
32 
24 
27 
59 
229 
127 
50 
73 
53 
20 
1700 
189 
74 
30 
51 
28 
24 
196 
115 
60 
71 
196 
21 
2050 
172 
72 
30 
30 
23 
26 
164 
100 
237 
65 
169 
22 
800 
159 
70 
38 
27 
18 
19 
156 
91 
80 
64 
138 
23 
24 
578 
1090 
151 
169 
65 
66 
32 
32 
24 
22 
17 
17 
10 
12 
151 
143 
86 
81 
57 
383 
162 
196 
97 
71 
25 
571 
144 
62 
33 
23 
26 
11 
134 
78 
310 
134 
60 
26 
501 
137 
58 
66 
21 
21 
28 
133 
74 
125 
154 
171 
27 
1140 
131 
54 
45 
22 
19 
22 
143 
71 
93 
96 
196 
28 
1380 
125 
54 
39 
19 
15 
19 
173 
67 
95 
77 
218 
29 
874 
120 
52 
42 
---
12 
268 
391 
66 
80 
110 
160 
30 
1000 
115 
52 
47 
12 
392 
722 
62 
182 
87 
186 
31 
1170 
---
47 
67 
9 9 
---
250 
---
385 
106 
---
TOTAL 
38859 
8848 
2401 
1252 
901 
625.9 
1423.7 
18174 
5205 
3206 
4078 
3263 
MEAN 
1254 
295 
77.5 
40,4 
32.2 
20.2 
47.5 
586 
174 
103 
132 
109 
MAX 
10000 
716 
110 
67 
60 
38 
392 
4890 
679 
385 
391 
218 
MIN 
119 
115 
47 
30 
19 
9.9 
8.2 
133 
62 
42 
64 
47 
CFSM 
10.4 
2.46 
.65 
.34 
.27 
.17 
.40 
4.88 
1.45 
.86 
1.10 
.91 
IN. 
12.05 
2.74 
.74 
.39 
.28 
.19 
.44 
5.63 
1.61 
.99 
1.26 
1.01 
AC-FT 
77080 
17550 
4760 
?480 
1790 
1240 
2820 
36050 
10320 
6360 
8090 
6470 
CAL YR 1985 
TOTAL 
87887 
MEAN 
241 
MAX 
10000 
MIN 
20 
CFSM 
2.01 
IN. 
27.24 
AC-FT 
174300 
WTR YR 1986 
TOTAL 
88236.6 
MEAN 
242 
MAX 
10000 
MIN 
8.2 
CFSM 
2.02 
IN. 
27.35 
AC-FT 
175000 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
266 
RIO GUANAJIBO BASIN 
50138000 RIO GUANAJIBO NEAR HORMIGUEROS, PR--Continued 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1958 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGtN, OXYGEN COLT- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITV 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
02... 
1315 
133 
368 
8.10 
26.0 
15 
<10 
K7000 
K1100 
DEC 
5... 
1230 
94 
484 
7.80 
24.0 
11 
6.8 
<10 
31000 
4700 
FEB 1986 
6... 
1445 
39 
564 
7.80 
26.0 
10 
6.2 
36 
35000 
4000 
APR 
09... 
1300 
31 
521 
8.00 
27.0 
16 
5.9 
75 
18 
28000 
K800 
JUL 
10... 
0915 
51 
424 
7.85 
27.0 
1.7 
6.5 
82 
<10 
K61000 
3500 
SEP 
16... 
1615 
46 
440 
7.90 
29.0 
8.5 
5.4 
71 
20 
57000 
8200 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD-
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
02... 
180 
24 
27 
28 
12 
0.4 
1.8 
159 
<0.5 
17 
13 
DEC 
05... 
189 
FEB 1986 
06... 
197 
APR 
9... 
230 
32 
31 
36 
20 
0.6 
2.3 
194 
<0.5 
40 
22 
JUL 
10... 
190 
SEP 
16... 
200 
4 
31 
30 
16 
0.5 
2.1 
197 
18 
17 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
02... 
0.20 
32 
230 
81 
11 
0.760 
0.040 
0.800 
0.230 
0.37 
DEC 
05... 
34 
0.770 
0.030 
0.800 
0.140 
0.36 
FEB 1986 
06... 
12 
0.860 
0.040 
0.900 
0.320 
0.58 
APR 
9... 
0.40 
34 
300 
25 
23 
0.750 
0.050 
0.800 
0.290 
0.51 
JUL 
10... 
11 
<0.010 
0.500 
0.010 
0.19 
SEP 
16... 
0.20 
33 
270 
33 
12 
0.630 
0.070 
0.700 
0.410 
0.09 
K = non-ideal count 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
  
 
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
RIO GUANAJIBO BASIN 
50138000 RIO GUANAJIBO NEAR HORMIGUEROS, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA NITRO- NITRO- PHOS- 
TOTAL TOTAL TOTAL TOTAL TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L •(UG/L (UG/L (UG/L (UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
02... 
0.60 
1.4 
6.2 
0.340 
<1 
<100 
20 
1 
22 
10 
DEC 
5... 
0.E0 
1.3 
5.8 
0.360 
FEB 1986 
6... 
0.90 
1.8 
8.0 
0.490 
APR 
9... 
0.80 
1.6 
7.1 
0.550 
2 
<100 
140 
<1 
21 
<10 
JUL 
10... 
0.20 
0.70 
3.1 
0.040 
SEP 
16... 
0.50 
1.2 
5.3 
0.460 
MANGA- 
METHY- 
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
02... 
1600 
2 120 <0.10 
<1 
<1 
10 <0.010 
<1 0.04 
DEC 
5... 
FEB 1986 
6... 
APR 
9... 
1100 
3 140 <0.10 
<1 
<1 
10 
<0.010 
<1 
0.07 
JUL 
10... 
SEP 
16... 
PESTICIDE ANALYSES 
CHLOR- 
DI- 
DI- 
PCB, ALDRIN, DANE, DOD, DDE, DDT, AZINON, ELDRIN 
DATE 
TIME 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
10... 
0915 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.07 
<0.010 
HEPTA- 
METH- 
ENDO- 
HEPTA- CHLOR 
MALA- OXY- 
SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, 
DATE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) (UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
JUL 1986 
10... 
<0.010 <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 
NAPH- 
THA- 
METHYL METHYL 
LENES, 
PARA- 
TRI- 
PARA- 
POLY- 
PER- 
TOX- 
TOTAL 
THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI-
DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
10... 
<0.01 
<0.01 
<0.01 
<0.01 
<0.10 
<0.1 
<1 
<0.01 
267 
 
 
 
 
Drainage boundary 
Rio Cuiebrinos basin 
GLARES 
A ASCO 
Anasco 
Rio Grand 
Cyuaiatoca 
eosin 
1.0 
1460 
Rip Comuy basin 
LAS 
MAMA 
R(0 Tacoma" basin 
MAYAGUEZ 
MAR ICAO 
. 
Coastot basin ." 
Rio Guanojib0 basin 
Drainage boundary-, 
land 
de 
EXPLANATION 
At440 SURFACE—WATER STATION AND NUMBER 
V1388 QUALITY—OF—WATER STATION AND NUMBER 
Map area-, 
CASUAS. 
BUAYA M 
Figure 24.--Rio YagUez and Rio Grande de Afiasco basins 
 
 
 
         
 
    
 
 
     
        
  
        
  
        
  
 
 
   
           
           
 
 
 
 
  
 
         
           
         
 
 
 
     
         
 
 
          
         
         
 
 
  
 
 
   
         
 
      
  
270 
RIO YAGUEZ BASIN 
50138800 RIO YAGUEZ NEAR MAYAGUEZ, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°12'31", long 67°07'07", at steel-truss bridge on unnumbered paved road about 800 ft (244 m) south 
of Highway 106, 1.8 mi (2.9 km) west of Highways 106 and 352 junction, and 1.4 mi (2.3 km) east-northeast from 
Mayaguez plaza. 
DRAINAGE AREA.--6.7 sq mi (17.3 sq km). 
PERIOD OF RECORD.--Water years 1979 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
01... 
1225 
10 
263 
8.20 
24.5 
6.0 
8.5 
19 
K700 
810 
DEC 
06... 
0730 
8.8 
297 
8.20 
21.0 
0.80 
8.6 
<10 
K36 
440 
FEB 1986 
05... 
1420 
5.3 
282 
8.40 
24.5 
14 
10.0 
46 
59000 
87000 
MAY 
02... 
0810 11 
162 7.80 
22.5 
670 
8.5 
99 
28 59000 87000 
JUL 
11... 
0815 
5.3 
303 
8.00 
24.5 
1.5 
8.4 
101 
13 
K620 
620 
SEP 
17... 
0755 
6.1 
306 
7.95 
23.0 
1.5 
8.6 
101 
17 
290 
2900 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD-
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
01... 
120 
5 
30 
10 
9.7 
0.4 
2.3 
111 
<0.5 
7.7 
7.3 
DEC 
06... 
120 
FEB 1986 
05... 
110 
MAY 
02... 
63 
0 
16 
5.6 
6.9 
0.4 
2.0 
67 
<0.5 
9.1 
8.6 
JUL 
11... 
138 
SEP 
17... 
130 
0 
37 
10 
11 
0.4 
2.1 
139 
7.8 
9.4 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOIAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
5102) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
1... 
<0.10 
29 
160 
4.4 
2 
0.790 
0.010 
0.800 
0.020 
0.18 
DEC 
06... 
4 
<0.010 
0.900 
0.010 
FEB 1986 
05... 
10 
<0.010 
0.300 
0.010 
0.39 
MAY 
2... 
<0.10 
19 
110 
3.1 
672 
0.730 
0.070 
0.800 
0.160 
0.44 
JUL 
11... 
3 0.620 0.080 0.700 0.390 0.41 
SEP 
17... 
<0.10 
30 
190 
3.1 
3 
<0.010 
0.600 
0.040 
K = non-ideal count 
 
 
        
 
          
         
          
  
     
          
    
  
 
 
 
 
 
 
       
 
 
          
        
       
  
    
271 
RIO YAGUEZ BASIN 
50138800 RIO YAGUEZ NEAR MAYAGUEZ, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
01... 
0.20 
1.0 
4.4 
0.030 
<1 
100 
<10 
1 
3 
<10 
DEC 
06... 
<0.20 
0.040 
FEB 1986 
05... 
0.40 
1.2 
5.3 
0.050 
--
MAY 
02... 
0.60 
1.4 
6.2 
0.160 
<1 
200 
20 
<1 
23 
50 
JUL 
11... 
0.80 
1.5 
6.6 
0.400 
SEP 
17... 
<0.20 
0.040 
MANGA-
METHY-
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
01... 
380 
<1 
20 <0.10 
<1 
<1 
10 <0.010 
2 0.03 
DEC 
06... 
FEB 1986 
05... 
MAY 
02... 
28000 
4 580 <0.10 
<1 
<1 
50 <0.010 
<1 0.09 
JUL 
11... 
SEP 
17... 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO GRANDE DE ANASCO BASIN 
50143000 RIO GRANDE DE ANASCO NEAR LARES, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°15'26", long 66°55'00", at bridge on Highway 124, 0.7 mi (1.1 km) downstream from confluence of 
Rio Blanco and Rio Prieto, and 3.7 mi (6.0 km) southwest of Lares plaza. 
DRAINAGE AREA.--26.3 sq mi (68.1 sq km) this does not include 36.2 sq mi (93.8 sr km) which contributes only dur-
ing high floods, and 3.5 sq mi (9.1 sq km) which contributes only part of its storm runoff. 
PERIOD OF RECORD.--Water years 1959-68, 1970 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLT- STREP- 
SPE- 
DIS- DEMANC, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) (US/CM) UNITS) (DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
31... 
1030 
890 
175 
7.80 
23.5 
61 
8.2 
25 
K1700 
4900 
DEC 
11... 
1225 
50 
291 
8.20 
24.5 
1.7 
9.4 
11 
270 
56 
FEB 1986 
11... 
1215 
28 
312 
8.45 
23.0 
71 
8.7 
103 
21 
120 
500 
MAY 
01... 
1430 
212 
224 
7.81 
25.0 
33 
8.2 
100 
63 
4800 
20000 
JUL 
10... 
1200 
34 
268 
7.90 
29.0 
750 
7.3 
95 
61 
1200 
2000 
SEP 
11... 
1200 
35 
293 
7.51 
29.0 
630 
7.4 
98 
25 
K2700 
1800 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD- 
SLUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- 
(MG/L 
TOT FLU 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
31... 
70 
6 
18 
6.0 
8.0 
0.4 
1.8 
64 
<0.5 
10 
7.3 
DEC 
11... 
114 
FEB 1986 
11... 
121 
MAY 
01... 
82 
7 
23 
5.9 
9.1 
0.5 
2.4 
75 
<0.5 
14 
8.2 
JUL 
10... 
105 
SEP 
11... 
100 
8 
27 
8.2 
13 
0.6 
2.5 
93 
18 
12 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2iNO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
31... 
<0.10 
20 
110 
263 
51 
1.18 
0.020 
1.20 
0.050 
0.55 
DEC 
11... 
1 
1.29 
0.010 
1.30 
0.030 
0.27 
FEB 1986 
11... 
126 
1.13 
0.070 
1.20 
0.030 
0.37 
MAY 
01... 
<0.10 
22 
130 
74 
504 
1.65 
0.050 
1.70 
0.260 
0.44 
JUL 
10... 
824 
1.12 
0.380 
1.50 
1.10 
1.0 
SEP 
11... 
0.20 
28 
160 
16 
1130 
2.34 
0.360 
2.70 
1.180 
1.0 
K = non-ideal count 
272 
 
 
    
    
 
          
         
          
    
 
 
  
          
 
 
 
 
 
 
 
    
  
  
          
        
 
  
 
  
 
  
 
 
 
 
 
273 
RIO GRANDE DE ABASCO BASIN 
50143000 RIO GRANDE DE ABASCO NEAR LARES, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
31... 
0.60 
1.8 
8.0 
0.060 
<1 
<100 
10 
1 
16 
50 
DEC 
11... 
G.30 
1.6 
7.1 
0.040 
FEB 1986 
11... 
0.40 
1.6 
7.1 
0.040 
MAY 
01... 
0.70 
2.4 
11 
0.150 
1 
200 
40 
1 
26 
70 
JUL 
10... 
2.1 
3.6 
16 
0.340 
SEP 
11... 
1.2 
3.9 
17 
0.530 
MANGA-
METHY-
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
31... 
4900 
40 150 0.10 
<1 
<1 
30 <0.010 
<1 0.05 
DEC 
11... 
FEB 1986 
11... 
MAY 
01... 
29000 
5 820 0.20 
<1 
<1 
70 <0.010 
<1 0.09 
JUL 
10... 
SEP 
11... 
I
I
I
I
I
I
I
I
I 
I
I
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
274 
RIO GRANDE DE ANASCO BASIN 
50144000 RIO GRANDE DE ANASCO NEAR SAN SEBASTIAN, PR 
LOCATION.--Lat 18°17'05", long 67°03'05", Hydrologic Unit 21010003, on right bank, at downstream side of 
bridge on Highway 108, 0.4 i (0.6 km) downstream from Quebrada La Zumbadora, 4.4 i (7.1 km) northwest of 
Las Marias, 5.4 i (8.7 km) southwest of San Sebastian. 
DRAINAGE AREA.--94.3 mil (244.2 km2), does not include 36.2 i 2 (93.8 km') which contributes only during high 
floods, and 3.5 i 2 (9.1 km 2) which contributes only part of its storm runoff. 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--March 1963 to current year. 
GAGE.--Water-stage recorder. Datum of gage is 103.72 ft (31.614 m) above mean sea level (Puerto Rico Department of 
Public Works bench mark). Previous to Oct. 30, 1975, a site 600 ft (180 m) upstream at same datum. 
REMARKS.--Estimated daily discharges: Oct. 7. 8. Records fair except those for estimated daily discharges, which 
are poor. Transbasin diversion (except during floods) to Rio Yauco basin for hydroelectric power and irrigation 
above Lago Guayo, Yahuecas, and Prieto, combined usable storage 17,300 acre-ft (21.3 hm'). Limited storm runoff 
is contributed to basin by 3.5 mil (9.1 km2) above Rio Toro Diversion dam. 
AVERAGE DISCHARGE.--23 years (1964-86), 313 ft'is (8.864 '/s), 45.08 in/yr (1,145 m/yr), 226,800 acre-ft/yr 
(280 hiP/yr); median of yearly mean discharges, 303 ft'/s (8.581 m'/s), 220,000 acre-ft/yr (271 hiP/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 140,000 ft'/s (3,960 10/s), Sept. 16, 1975, gage height, 
33.9 ft (10.33 ), fro rating curve extended above 4,000 ft'is (113 '/s) on basis of slope-area measurement; 
minimum discharge, 31 ft'is (0.878 '/s), Apr. 19, 20, 1965. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 6,000 ft'A (170 m 3/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(W/s) (10/s) 
(ft) 
(m) 
Date 
Time 
(ft'/s) (e/s) 
(ft) 
(m) 
Oct. 6 
2115 
8,630 
244 
8.68 2.646 
Nov. 4 
1800 
10,400 
294 
9.50 2.896 
Oct. 7 
0500 
*53,600 
1,518 
*21.94 6.687 
Apr. 30 
2015 
9,090 
257 
8.90 2.713 
Oct. 26 
2230 
6,590 
187 
7.60 2.316 
May 
1 
1915 
13,800 
306 
9.71 2.960 
Oct. 28 
1715 
7,880 
223 
8.30 2.530 
May 13 
2330 
11,400 
323 
9.96 3.036 
Minimum discharge, 42 ft'is (1.189 m 3/s), Apr. 15, 16. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
DAY 
OCT 
NOV 
DEC 
JAN 
MEAN 
FEB 
VALUES 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
2 
3 
4 
5 
599 
328 
230 
210 
180 
851 
743 
952 
1570 
759 
227 
221 
215 
211 
206 
147 
153 
140 
139 
135 
116 
107 
151 
237 
154 
73 
66 
74 
115 
79 
56 
56 
106 
331 
171 
2680 
1410 
1180 
1210 
1160 
259 
229 
217 
201 
192 
208 
204 
200 
203 
167 
473 
370 
260 
324 
427 
398 
554 
497 
315 
226 
6 
7 
8 
9 
10 
1300 
4400 
2500 
1650 
967 
520 
446 
394 
359 
335 
205 
197 
189 
187 
188 
128 
127 
127 
150 
158 
123 
114 
119 
109 
107 
72 
69 
81 
72 
63 
132 
87 
90 
103 
82 
1480 
1770 
1220 
1010 
1310 
18? 
382 
359 
285 
680 
177 
243 
291 
252 
179 
558 
836 
727 
567 
406 
196 
175 
198 
195 
176 
11 
12 
13 
14 
15 
1170 
840 
1050 
769 
1520 
317 
299 
286 
284 
317 
183 
179 
180 
173 
171 
130 
123 
122 
117 
114 
103 
95 
97 
97 
96 
89 
71 
70 
68 
70 
74 
62 
56 
50 
45 
1350 
784 
4170 
3920 
1360 
442 
443 
600 
329 
726 
199 
175 
147 
240 
235 
341 
376 
475 
408 
450 
169 
173 
154 
138 
153 
16 
17 
18 
19 
20 
733 
424 
336 
506 
727 
440 
587 
658 
372 
309 
172 
172 
169 
164 
161 
111 
107 
111 
104 
100 
86 
84 
95 
106 
104 
59 
59 
172 
148 
93 
58 
153 
314 
269 
116 
974 
759 
652 
578 
496 
550 
326 
476 
427 
278 
573 
570 
476 
342 
459 
319 
390 
305 
281 
270 
172 
278 
325 
156 
140 
21 
22 
23 
24 
25 
703 
516 
619 
1260 
919 
287 
272 
266 
262 
260 
158 
156 
157 
154 
148 
96 
113 
100 
139 
112 
120 
91 
79 
80 
99 
74 
65 
56 
56 
101 
304 
115 
91 
175 
112 
396 
339 
286 
261 
283 
267 
244 
234 
224 
215 
516 
264 
214 
335 
297 
243 
233 
250 
312 
362 
144 
195 
180 
145 
153 
26 
27 
28 
29 
30 
31 
1300 
2370 
2290 
1270 
998 
1160 
252 
248 
244 
237 
232 
---
148 
147 
146 
146 
147 
144 
160 
127 
112 
108 
197 
207 
85 
84 
80 
---
90 
73 
68 
64 
72 
59 
238 
120 
102 
791 
1780 
---
315 
625 
445 
464 
438 
293 
229 
563 
254 
224 
215 
---
472 
331 
299 
343 
605 
584 
418 
257 
233 
235 
340 
256 
140 
132 
420 
129 
99 
---
TOTAL 
MEAN 
MAX 
MIN 
CFSM 
IN. 
AC-FT 
33844 
1092 
4400 
180 
11.6 
13.35 
67130 
13358 
445 
1570 
232 
4.72 
5.27 
26500 
5421 
175 
227 
144 
1.86 
2.14 
10750 
4014 
129 
207 
96 
1.37 
1.58 
7960 
3018 
108 
237 
79 
1.15 
1.19 
5990 
2441 
78.7 
172 
56 
.83 
.96 
4840 
1
6239 
208 
1780 
45 
2.21 
2.46 
2380 
33618 
1084 
4170 
261 
11.5 
13.26 
66680 
10252 
342 
726 
182 
3.63 
4.04 
20330 
9800 
316 
605 
147 
3.35 
3.87 
19440 
11702 
377 
836 
233 
4.00 
4.62 
23210 
6525 
218 
554 
99 
2.31 
2.57 
12940 
CAL YR 1985 
WTR YR 1986 
TOTAL 
TOTAL 
131791 
140232 
MEAN 
MEAN 
361 
384 
MAX 
MAX 
19100 
4400 
MIN 
MIN 
65 
45 
CFSM 
CFSM 
3.83 
4.07 
IN. 
IN. 
51.99 
55.32 
AC-FT 
AC-FT 
261400 
278200 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
  
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
275 
RIO GRANDE DE ANASCO BASIN 
50144000 RIO GRANDE DE ANASCO NEAR SAN SEBASTIAN, PR--Continued 
(National stream-quality accounting network station) 
WATER-QUALITY RECORDS 
PERIOD OF RECORD.--Water years 1963 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
COLI-
STREP-
HARD-
SPE-
FORM, TOCOCCI 
NESS 
STREAM- CIFIC 
FECAL, FECAL, HARD- NONCARB 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
0.7 
KF AGAR 
NESS 
WATER 
:NSTAN-
DUCT-
(STAND-
ATURE 
BID-
DIS-
UM-MF 
(COLS. 
(MG/L 
TOT FLD 
DATE 
TIME 
TANEOUS 
ANCE 
ARD 
WATER 
ITY 
SOLVED (COLS./ 
PER 
AS 
MG/L AS 
(CFS) (US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 100 ML) 100 ML) 
CAC03) 
CAC03 
OCT 1985 
02... 
1040 
270 
209 
8.00 
24.0 
57 
8.9 
K15000 
6000 
93 
JAN 1986 
09... 
1140 
124 
250 
8.20 
22.0 
1.3 
9.7 
110 
3 
APR 
11... 
1300 
84 
273 
7.56 
28.0 
20 
8.5 
140 
110 
17 
JUL 
02... 
1115 
206 
235 
7.91 
27.0 
130 
8.1 
260 
220 
100 
2 
ALKA-
SOLIDS, 
MAGNE-
SODIUM 
POTAS-
LINITY 
CHLO-
FLUO-
SILICA, RESIDUE 
CALCIUM 
SIUM, SODIUM, 
AD-
SIUM, 
WATER 
SULFATE RIDE, 
RIDE, 
DIS-
AT 180 
DIS-
DIS-
DIS-
SORP-
DIS-
TOTAL 
DIS-
DIS-
DIS-
SOLVED 
DEG. C 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
SOLVED 
SOLVED 
SOLVED 
(MG/L 
DIS-
DATE 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
AS 
SOLVED 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS SO4) 
AS CL) 
AS F) 
SI02) 
(MG/L) 
OCT 1985 
02... 
24 
8.0 
7.7 
0.4 
3.8 
87 
9.5 
5.9 
<0.10 
26 
128 
JAN 1986 
09... 
28 
9.6 
10 
0.4 
1.4 
107 
10 
8.5 
0.10 
30 
154 
APR 
11... 
29 
9.4 
10 
0.4 
1.8 
94 
13 
7.9 
0.10 
29 
162 
JUL 
02... 
26 
9.0 
11 
0.5 
1.6 
100 
10 
7.9 
0.10 
31 
156 
SOLIDS, 
NITRO- NITRO- NITRO- NITRO-
PHOS- PHOS-
SUM OF 
SOLIDS, 
GEN, 
GEN, 
GEN, 
GEN,AM-
PHOS-
PHORUS, 
PRATE, 
CONSTI-
DIS- NO2+NO3 AMMONIA AMMONIA MONIA 
PHOS- PHORUS, ORTHO, ORTHO, 
TUENTS, SOLVED DIS-
01S-
DIS- ORGANIC PHORUS, DIS- DIS-
DIS-
DIS-
(TONS SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED SOLVED SOLVED 
DATE SOLVED PER (MG/L (MG/L (MC/L (MG/L (MG/L (MG/1 (MG/L (MG/L 
(MG/L) 
DAY) 
AS N) 
AS N) 
AS NH4) 
AS N) 
AS P) 
AS P) 
AS P) 
AS PO4) 
OCT 1985 
02... 
140 
93 
0.800 
0.040 
0.05 
0.60 
0.100 
0.050 
0.030 
0.09 
JAN 1986 
09... 
160 
52 
0.730 
0.030 
0.04 
0.30 
0.040 
0.040 
0.040 
0.12 
APR 
11... 
160 
37 
0.670 
0.100 
0.13 
0.30 
0.060 
0.040 
0.030 
0.09 
JUL 
02... 
160 
87 
0.860 
0.210 
0.27 
0.50 
0.100 
0.040 
0.040 
0.12 
ALUM-
BERYL-
CHRO-
INUM, ARSENIC BARIUM, LIUM, CADMIUM M1UM, COBALT, COPPER, IRON, LEAD, 
DIS-
DIS-
D1S-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS AL) 
AS AS) 
AS BA) 
AS BE) 
AS CD) 
AS CR) 
AS CO) 
AS CU) 
AS FE) 
AS PB) 
OCT 1985 
02... 
40 
<1 
42 
<0.5 
<1 
<1 
<3 
2 
33 
<1 
JAN 1986 
09... 
<10 
<1 
39 
<0.5 
<1 
<1 
<3 
1 
6 
<1 
APR 
11... 
40 
<1 
37 
<0.5 
1 
<1 
<3 
8 
50 
2 
JUL 
02... 
40 
<1 
36 
0.7 
<1 
<1 
<3 
3 
20 
<5 
K = non-ideal count 
 
  
         
          
         
 
   
 
276 
RIO GRANDE DE ANASCO BASIN 
50144000 RIO GRANDE DE ANASCO NEAR SAN SEBASTIAN, PR--Continued 
(National stream-quality accounting network station) 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MANGA-
MOLYB-
SELE-
STRON- VANA-
LITHIUM NESE, MERCURY DENUM, NICKEL, NIUM, SILVER, TIUM, DIUM, ZINC, 
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
DIS-
SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS LI) 
AS MN) 
AS HG) 
AS MO) 
AS NI) 
AS SE) 
AS AG) 
AS SR) 
AS V) 
AS ZN) 
OCT 1985 
02... 
<4 
33 
<0.1 
<10 
2 
<1 
<1 
120 
<6 
9 
JAN 1986 
09... 
<4 
12 
<0.1 
<10 
<1 
<1 
<1 
150 
<6 
<3 
APR 
11... 
1 
18 
0.1 
<10 
1 
<1 
<1 
140 
9 
31 
JUL 
02... 
<4 
10 
0.2 
(10 
2 
<1 
<1 
140 
9 
6 
PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT 
SFDI-
MENT, 
SUSP. 
STREAM- SEDI- DIS- SIEVE 
FLOW, MENT, CHARGE, DIAM. 
INSTAN-
SUS-
SUS-
6 FINER 
DATE TIME TANEOUS PENDED PENDED THAN 
(CFS) 
(MG/L) (T/DAY) .062 MM 
OCT 1985 
02... 
1022 
266 
114 
82 
97 
JAN 1986 
09... 
1140 
124 
36 
12 
88 
APR 
11... 
1300 
85 
70 
16 
99 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
 
  
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO GRANDE DE ANASCO BASIN 
50146000 RIO GRANDE DE ANASCO NEAR ANASCO, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°16'00", long 67°08'05", at bridge on Highway 430, 0.2 mi (0.3 km) south of Highway 109 at El 
Espino and 1.4 mi (2.3 km) east-southeast from Atiasco plaza. 
DRAINAGE AREA.--139 sq mi (360 sq km) this does not include 39.7 sq mi (102.8 sq km), flow is diverted to south 
coast. 
PERIOD OF RECORD.--Water years 1979 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLT- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) (US/CM) UNITS) (DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
03... 
1000 
333 
196 
7.60 
25.0 
58 
8.6 
<10 
2500 
4300 
DEC 
10... 
1610 
235 
246 
7.80 
26.5 
3.0 
9.0 
<10 
220 
K100 
FEB 1986 
10... 
1800 
114 
254 
8.00 
25.5 
30 
8.1 
100 
37 
K110 
340 
APR 
30... 
1530 
170 
7.08 
24.5 
740 
8.0 
94 
26000 
62000 
JUL 
9... 
1430 
291 
291 
7.40 
28.5 
300 
7.3 
93 
29 
15700 
28000 
SEP 
10... 
1425 
243 
259 
7.68 
30.0 
46 
7.8 
104 
<10 
340 
K130 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD- 
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
03... 
80 
0 
19 
7.8 
7.6 
0.4 
1.7 
81 
<0.5 
9.3 
6.0 
DEC 
10... 
105 
FEB 1986 
10... 
103 
APR 
30... 
68 
15 
19 
5.1 
6.5 
0.4 
2.2 
53 
<0.5 
15 
6.7 
JUL 
9... 
72 
SEP 
10... 
98 
0 
25 
8.6 
10 
0.5 
2.0 
98 
8.2 
7.0 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS' SUS- TOTAL TOTAL. TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
S102) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
03... 
<0.10 
27 
130 
114 
69 
0.680 
0.020 
0.700 
0.070 
0.43 
DEC 
10... 
10 
0.790 
0.010 
0.800 
0.040 
0.36 
FEB 1986 
10... 
32 
0.780 
0.020 
0.800 
0.030 
0.27 
APR 
30... 
<0.10 
17 
100 
0.0 
1160 
1.12 
0.080 
1.20 
0.230 
2.5 
JUL 
9... 
487 
0.920 
0.080 
1.00 
0.140 
0.46 
SEP 
10... 
0.10 
32 
150 
100 
1 
0.890 
0.010 
0.900 
0.060 
0.14 
K = non-ideal count 
277 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
RIO GRANDE DE ANASCO BASIN 
50146000 RIO GRANDE DE ANASCO NEAR ANASCO, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RZCOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
03... 
0.50 
1.2 
5.3 
0.100 
<1 
<100 
40 
<1 
12 
20 
DEC 
10... 
0.40 
1.2 
5.3 
0.040 
FEB 1986 
10... 
0.30 
1.1 
4.9 
0.040 
APR 
30... 
2.7 
3.9 
17 
0.450 
1 
300 
40 
1 
21 
120 
JUL 
9... 
0.60 
1.6 
7.1 
0.070 
SEP 
10... 
0.20 
1.1 
4.9 
0.070 
MANGA- 
METHY- 
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE- 
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
03... 
4100 
5 
170 
<0.10 
<1 
<1 
20 
<0.010 
4 
0.03 
DEC 
10... 
FEB 1986 
10...
-- 
APR 
30... 
50000 
11 
1700 
0.20 
1 
<1 
190 
<0.010 
<1 
0.09 
JUL 
09... 
SEP 
10...
-- 
PESTICIDE ANALYSES 
CHLOR- 
DI- 
DI- 
PCB, 
ALDRIN, 
DANE, 
DOD, 
ODE, 
DDT, 
AZINON, 
ELDRIN 
DATE 
TIME 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
09... 
1430 
<0.1 
<0.010 
<0.1 
<0.010 
<0.010 
<0.010 
0.01 
<0.010 
HEPTA- 
METH- 
ENDO- 
HEPTA- CHLOR 
MALA- OXY- 
SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, 
DATE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
(UG/L) 
JUL 1986 
09... 
<0.010 
<0.010 
<0.01 
<0.010 
<0.010 
<0.010 
<0.01 
<0.01 
NAPH- 
THA- 
METHYL METHYL 
LENES, 
PARA- 
TRI- 
PARA- 
POLY- 
PER- 
TOX- 
TOTAL 
THION, THION, MIREX, THION, CHLOR. THANE APHENE, 1RI-
DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
09... 
<0.01 
<0.01 
<0.01 
<0.01 
<0.10 
<0.1 
<1 
<0.01 
278 
 
 
 
 
 
   
AGUADILLA 
N 
Drainage boundary uncertain 
Ago 
///Pb 
MOCA • 
Rib Guayabo 
RINCON 
• 
ASTIAL:Th 
• 
Rio Guajataca basin 
Coastal basin 
•••"\--•••" 
Coastal basin 
•• 
Rio Grande de Arloscobasin 
inos
46/­
LARES 
• 
/Drainage boundary \\. 
EXPLANATION 
A1478 SURFACE—WATER STATION AND NUMBER 
-1476 QUALITY—OF—WATER STATION AND NUMBER 
• 83 
WELL AND WELL NUMBER 
Map area 
AGUADILLA •ARECIBO 
.111AYAGUEZ 
O 
1I 
2I 
3 4 KILOMETERS 
O 
1 
2 
3 
4 MILES 
Figure 25.--Rio Culebrinas basin. 
 
 
         
 
    
 
     
  
  
        
  
           
        
 
       
  
          
 
 
 
 
  
 
         
           
         
           
 
 
           
         
 
 
 
     
         
 
 
 
          
         
          
 
     
 
     
          
     
         
280 
RIO CULEBRINAS BASIN 
50147600 RIO CULEBRINAS NEAR SAN SEBASTIAN, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18°20'51", long 67°02'40", at bridge on Highway 423, 1.3 mi (2.1 km) south of Quebrada El Salto 
Bridge on Highway 111, and 2.1 mi (3.4 km) west of Central La Plata. 
DRAINAGE AREA.--58.2 sq mi (150.7 sq km). 
PERIOD OF RECORD.--Water years 1979 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP-
SPE-
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON-
PH 
TEMPER-
TUR-
OXYGEN, 
(PER-
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) 
(US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
02... 
1815 
316 7.60 25.0 150 
8.1 
31 23000 28000 
DEC 
11... 
0925 
76 
281 
7.80 
23.0 
4.7 
8.1 
<10 
4800 
650 
FEB 1986 
11... 
0925 
28 
342 
8.05 
21.5 
4.9 
7.8 
89 
35 
K1100 
20000 
MAY 
01... 
0955 
334 
416 
7.97 
23.5 
56 
9.7 
6300 
7500 
JUL 
10... 
0905 
77 
267 
7.73 
25.5 
20 
7.5 
11 
K12000 
860 
SEP 
11... 
0825 
72 
309 
7.65 
25.5 
4.7 
7.5 
92 
12 
5900 
770 
HARD-
ALKA-
NESS 
MAW-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD-
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE 01S- DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
02... 
120 
0 
42 
3.8 
6.6 
0.3 
2.0 
121 
<0.5 
14 
8.0 
DEC 
11... 
110 
FEB 1986 
11... 
127 
MAY 
01... 
160 
8 
57 
5.4 
11 
0.4 
4.8 
157 
<0.5 
15 
10 
JUL 
10... 
106 
SEP 
11... 
110 
3 
36 
5.4 
12 
0.5 
2.3 
109 
10 
9.7 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO-
NITRO-
NITRO-
NITPO-
NITRO-
RIDE, 
DIS-
CONSTI-
DIS-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO20403 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
$102) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
02... 
<0.10 
14 
160 
0.0 
262 
0.760 
0.040 
0.800 
0.120 
0.78 
DEC 
11... 
5 
1.32 
0.080 
1.40 
0.080 
0.42 
FEB 1986 
11... 
10 
0.950 
0.050 
1.00 
0.480 
0.82 
MAY 
01... 
<0.10 
17 
210 
193 
80 
1.04 
0.060 
1.10 
0.150 
0.65 
JUL 
10... 
17 
1.02 
0.080 
1.10 
C.120 
0.38 
SEP 
11... 
0.10 
34 
170 
34 
7 
1.12 
0.080 
1.20 
0.110 
0.39 
E = estimate 
K = non-ideal count 
 
 
    
    
 
          
         
          
    
     
          
   
    
 
 
    
  
 
        
          
 
        
  
   
 
          
 
 
281 
RIO CULEBRINAS BASIN 
50147600 RIO CULEBRINAS NEAR SAN SEBASTIAN, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHRO-
GEN,AM-
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONTA + 
NITRO-
NITRO-
PHOS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV-
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
02... 
0.90 
1.7 
7.5 
0.200 
1 
<100 
40 
1 
16 
20 
DEC 
11... 
0.50 
1.9 
8.4 
0.110 
FEB 1986 
11... 
1.3 
2.3 
10 
0.290 
--
MAY 
01... 
0.80 
1.9 
8.4 
0.140 
1 
100 
50 
1 
11 
10 
JUL 
10... 
0.50 
1.6 
7.1 
0.130 
SEP 
11... 
0.50 
1.7 
7.5 
0.090 
--
MANGA-
METHY-
IRON, 
LEAD, 
NESE, 
MERCURY 
SILVER, 
ZINC, 
LENE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
SELE-
TOTAL 
TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB-
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
02... 
8500 
5 220 <0.10 
<1 
<1 
30 <0.010 
3 0.06 
DEC 
11... 
--
FEB 1986 
11... 
MAY 
01... 
3600 
4 
100 
<0.10 
<1 
<1 
30 
<0.010 
<1 
0.05 
JUL 
10... 
SEP 
11... 
I
I
I 
I
I
I
 
 
 
    
  
     
   
   
   
  
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
282 
RIO CULEBRINAS BASIN 
50147800 RIO CULEBRINAS AT HIGHWAY 404 NEAR MOCA, PR 
LOCATION.--Lat 18°21'42', long 67°05'33', Hydrologic Unit 21010003, on right bank, at bridge on Highway 404, 
0.3 mi (0.5 km) downstream from Quebrada Yagruma, and 2.8 mi (4.5 km) southeast of Moca. 
DRAINAGE AREA.--71.2 mi' (184.4 km 2 ). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--July 1967 to current year. 
GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 45 ft (14 m), from topographic map. 
REMARKS.--Estimated daily discharges: Nov. 5-20. Records fair except those for estimated daily discharges, which 
are poor. 
AVERAGE DISCHARGE.--19 years (1968-86), 310 ft'is (8.779 m'/s), 59.13 in/yr (1,502 mm/yr), 224,600 acre-ft/yr 
(277 hoP/yr); median of yearly mean discharges, 290 ft'A (8.21 10/s), 210,000 acre-ft/yr (260 hm'/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 69,000 ft'/s (1,950 
'/s), Sept. 16, 1975, gage height, 
36.6 ft (11.16 ) fro slope-area measurement, but ay have been exceeded by flood of Oct. 23, 1974, from rating 
curve extended above 2,600 ft'is (73.6 '/s) on basis of slope-area and contracted-opening measurements of peak 
flow; minimum discharge, 16 ft'is (0.453 m3 /s), Apr. 17-19, 1979. 
'/s) and maximum (*):
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 11,300 ft'/s (320 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(W/s) 
(10/s) 
(ft) 
(m) 
Date 
Time 
(W/s) 
(11 3 /s) 
(ft) 
(m) 
Oct. 1 
2030 
20,400 
578 
26.11 7.958 
May 
3 
2145 
23,500 
666 
27.11 8.263 
Oct. 
7 
1145 
23,200 
657 
26.99 8.226 
May 
5 
2030 
*34,700 
183 
*30.12 9.181 
Nov. 
3 
2030 
25,400 
719 
27.65 8.428 
May 
6 
1900 
24,200 
685 
27.32 8.327 
Apr. 27 
0015 
27,300 
773 
28.20 8.595 
May 
13 
1015 
29,800 
844 
28.88 8.803 
Apr. 28 
2230 
11,300 
320 
22.43 6.837 
May 
26 
2100 
12,600 
357 
23.08 7.035 
Apr. 29 
2000 
11,900 
337 
22.72 
6.925 
May 
27 
1830 
15,400 
436 
24.28 7.400 
Minimum discharge, 33 ft 3 /s (0.934 10/s), Mar. 15, 24, 27. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
4300 
241 
122 
67 
77 
46 
61 
833 
249 
151 
184 
202 
2 
1280 
204 
119 
66 
70 
48 
51 
862 
222 
146 
315 
940 
3 
362 
5030 
117 
62 
97 
72 
100 
4370 
207 
141 
201 
313 
4 
275 
1290 
115 
61 
133 
129 
121 
1660 
190 
137 
143 
212 
5 
238 
1520 
112 
60 
96 
61 
128 
8440 
178 
132 
431 
144 
6 
460 
1020 
128 
59 
78 
49 
83 
8440 
168 
149 
307 
123 
7 
10700 
800 
123 
58 
75 
42 
132 
6790 
311 
239 
272 
103 
8 
900 
660 
108 
58 
66 
39 
312 
962 
420 
165 
299 
94 
1170
9 
439 
500 
103 
70 
63 
39 
226 
571 
235 
138 
88 
10 
327 
450 
101 
91 
61 
36 
124 
1710 
1640 
127 
294 
87 
11 
1470 
400 
99 
63 
63 
75 
85 
580 
375 
147 
196 
81 
12 
587 
380 
96 
60 
60 
53 
1350
72 
212 
128 
163 
78 
13 
406 
360 
92 
57 
61 
39 
63 
11700 
246 
115 
148 
83 
14 
275 
370 
88 
54 
56 
37 
56 
4530 
217 
110 
148 
85 
15 
241 
980 
88 
52 
58 
34 
52 
680 
185 
204 
156 
91 
16 
222 
1100 
87 
50 
53 
45 
53 
482 
175 
222 
226 
75 
17 
203 
700 
84 
49 
55 
109 
368 
154 
155 
70
58 
161 
18 
187 
390 
83 
50 
54 
172 
96 
316 
166 
129 
128 
70 
19 
177 
260 
83 
48 
63 
60 
77 
287 
601 
136 
139 
67 
20 
169 
206 
82 
48 
80 
46 
120 
263 
685 
705 
115 
64 
21 
166 
195 
79 
45 
92 
39 
163 
382 
479 
193 
106 
63 
22 
158 
178 
77 
47 
63 
38 
194 
287 
477 
i33 
103 
103 
23 
170 
169 
78 
45 
53 
35 
1010 
523 
291 
119 
98 
77 
24 
242 
159 
75 
43 
50 
35 
1910 
379 
207 
119 
104 
63 
25 
162 
152 
71 
45 
53 
34 
354 
269 
184 
171 
112 
94 
26 
1860 
146 
70 
44 
50 
41 
3040 
2100 
238 
887 
171 
88 
27 
1740 
139 
69 
45 
50 
109 
3350 
2500 
317 
258 
97 
62 
28 
1700 
135 
68 
42 
49 
200 
2260 
470 
190 
164 
184 
486 
29 
455 
131 
68 
50 
---
305 
3130 
843 
167 
420 
111 
139 
30 
327 
128 
68 
104 
164 
1100 
426 
158 
243 
134 
98 
31 
280 
---
66 
127 
90 
---
292 
---
270 
103 
---
TOTAL 
30478 
18393 
2819 
1820 
1879 
2270 
18632 
63665 
9544 
6559 
6513 
4343 
MEAN 
983 
613 
90.9 
58.7 
67.1 
73.2 
621 
2054 
318 
212 
210 
145 
MAX 
10700 
5030 
128 
127 
133 
305 
3350 
11700 
1640 
887 
1170 
940 
MIN 
158 
128 
66 
42 
49 
34 
51 
263 
154 
110 
97 
62 
CFSI.1 
13.8 
8.61 
1.28 
.82 
.94 
1.03 
8.72 
28.8 
4.47 
2.95
2.98 
2.04 
IN. 
15.92 
9.61 
1.47 
.95 
.98 
1.19 
9.73 
33.26 
4.99 
3.43 
3.40 
2.27 
AC-FT 
60450 
36480 
5590 
3610 
3730 
4500 
36960 
126300 
18930 
13010 
12920 
8610 
CAL YR 1985 
TOTAL 
136055 
MEAN 
373 
MAX 
10700 
MIN 
33 
CFSM 
5.24 
IN. 
71.08 
AC-FT 
269900 
WTR YR 1986 
TOTAL 
166915 
MEAN 
457 
MAX 
11700 
MIN 
34 
CFSM 
6.42 
IN. 
87.21 
AC-FT 
331100 
283 
RIO CULEBRINAS BASIN 
50147800 RIO CULEBRINAS AT HIGHWAY 404 NEAR MOCA, PR--Continued 
WATER QUALITY RECORDS 
PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
STREAMFLOW, 
SPECIFIC CON-
TEMPERA-
DATE 
TIME INSTANTANEOUS 
DUCTANCE 
TURE 
DATE 
TIME INSTANTANEOUS 
DUCTANCE 
TURE 
(CFS) 
(UMHOS) 
(DEG C) 
(CFS) 
(UMHOS) 
(DEG C) 
NOV, 20 1151 
212 
325 
25.0 
JUL, 09 0942 
141 
250 
25.5 
DEC, 11 0930 
100 
266 
23.0 
AUG, 11 1202 
197 
229 
27.0 
MAY, 06 1203 
759 
291 
25.0 
SEP, 04 1057 
170 
231 
25.0 
JUN, 11 1253 
?n6 
242 
25.0 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RIO CULEBRINAS BASIN 
50149100 RIO CULEBRINAS NEAR AGUADA, PR 
WATER-QUALITY RECORDS 
LOCATION.--Lat 18'24'03", long 67'09'40", at bridge on Highway 2, and 2.3 mi (3.7 km) northeast of Aguada plaza. 
DRAINAGE AREA.--97.0 Sq mi (251.2 sq km). 
PERIOD OF RECORD.--Water years 1958, 1970 to current year. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
OXYGEN, OXYGEN COLI- STREP- 
SPE- 
DIS- DEMAND, FORM, TOCOCCI 
STREAM- CIFIC 
SOLVED CHEM- FECAL, FECAL, 
FLOW, 
CON- 
PH 
TEMPER- 
TUR- 
OXYGEN, 
(PER- 
ICAL 
0.7 
KF AGAR 
INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. 
DATE 
TIME TANEOUS ANCE 
ARD 
WATER 
ITY 
SOLVED SATUR- LEVEL) (COLS./ PER 
(CFS) (US/CM) UNITS) 
(DEG C) 
(NTU) 
(MG/L) 
ATION) (MG/L) 
100 ML) 100 ML) 
OCT 1985 
03... 
1400 
269 
7.40 
26.0 
140 
5.2 
30 
50000 
8000 
DEC 
10... 
1250 
167 
310 
7.80 
24.5 
2.9 
8.1 
<10 
520 
K11000 
FEB 1986 
10... 
1500 
70 
i12 
7.95 
23.5 
13 
7.5 
89 
14 
K1000 
2500 
APR 
30... 
1200 
1710 
312 
7.60 
25.5 
190 
5.5 
36 
K15000 
36000 
JUL 
9... 
1035 
211 
281 
7.53 
26.5 
60 
7.0 
19 
3100 
2200 
SEP 
10... 
1030 
183 
336 
7.70 
27.0 
17 
7.4 
93 
25 
980 
500 
HARD- 
ALKA- 
NESS 
MAGNE- 
SODIUM POTAS- LINITY 
CHLO- 
HARD- NONCARB CALCIUM SLUM, SODIUM, 
AD- 
SIUM, WATER 
SULFATE RIDE, 
NESS WATER DIS- D1S- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- 
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
TOTAL 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 
AS S) 
AS SO4) 
AS CL) 
OCT 1985 
03... 
120 
0 
41 
3.9 
6.6 
0.3 
1.8 
121 
<0.5 
14 
8.8 
DEC 
10... 
131 
FEB 1986 
10... 
125 
APR 
30... 
130 
16 
46 
3.9 
7.9 
0.3 
3.6 
115 
<0.5 
15 
9.0 
JUL 
9... 
117 
SEP 
10... 
130 
0 
42 
5.7 
12 
0.5 
2.3 
130 
9.6 
9.9 
SOLIDS, 
SOLIDS, 
FLUO- 
SILICA, SUM OF 
SOLIDS, RESIDUE 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
NITRO- 
RIDE, 
DIS- 
CONSTI- 
DIS- 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
DIS- 
SOLVED TUENTS, 
SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PER 
PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
DAY) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
AS N) 
OCT 1985 
03... 
0.10 
16 
160 
254 
0.360 
0.040 
0.400 
0.100 
0.90 
DEC 
10... 
3 
0.870 
0.030 
0.900 
0.100 
0.40 
FEB 1986 
10... 
26 
0.570 
0.030 
0.600 
C.130 
0.27 
APR 
30... 
<0.10 
14 
170 
776 
320 
0.750 
0.050 
0.800 
0.170 
0.73 
JUL 
9... 
220 
0.670 
0.030 
0.700 
0.100 
0.80 
SEP 
10... 
0.10 
33 
190 
95 
31 
0.870 
0.030 
0.900 
0.110 
0.19 
E = estimate 
K = non-ideal count 
284 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
RIO CULEBRINAS BASIN 
50149100 RIO CULEBRINAS NEAR AGUADA, PR--Continued 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHRO- 
GEN,AM- 
BARIUM, BORON, CADMIUM MIUM, COPPER, 
MONIA's NITRO- NITRO- PHOS- 
TOTAL TOTAL TOTAL TOTAL TOTAL 
ORGANIC GEN, 
GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- 
TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
AS N) 
AS N) 
AS NO3) 
AS P) 
AS AS) 
AS BA) 
AS B) 
AS CD) 
AS CR) 
AS CU) 
OCT 1985 
03... 
1.0 
1.4 
6.2 
0.200 
1 
100 
30 
<1 
22 
20 
DEC 
10... 
0.50 
1.4 
6.2 
0.090 
FEB 1986 
10... 
0.40 
1.0 
4.4 
0.070 
APR 
30... 
0.90 
1.7 
7.5 
0.200 
1 
100 
30 
3 
20 
30 
JUL 
9... 
0.90 
1.6 
7.1 
0.200 
SEP 
10... 
0.30 
1.2 
5.3 
0.070 
-- 
MANGA- 
METHY- 
IRON, LEAD, NESE, MERCURY 
SILVER, ZINC, 
LENE 
TOTAL TOTAL TOTAL TOTAL: SELE- TOTAL TOTAL 
BLUE 
RECOV- RECOV- RECOV- RECOV- NIUM, 
RECOV- RECOV- CYANIDE 
ACTIVE 
ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- 
DATE 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(UG/L 
(MG/L 
TOTAL 
STANCE 
AS FE) 
AS PB) 
AS MN) 
AS HG) 
AS SE) 
AS AG) 
AS ZN) 
AS CN) (UG/L) 
(MG/L) 
OCT 1985 
03... 
11000 
29 
360 
0.10 
<1 
<1 
40 
<0.010 
3 
0.05 
DEC 
10... 
FEB 1986 
10...
-- 
APR 
30... 
14000 
10 
350 
0.20 
<1 
<1 
40 
<0.010 
2 
0.09 
JUL 
9... 
SEP 
10... 
PESTICIDE ANALYSES 
CHLOR- 
DI- 
DI- 
PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN 
DATE 
TIME 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
09... 
1035 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.01 <0.010 
HEPTA- 
METH- 
. ENDO- 
HEPTA- CHLOR 
MALA- 
OXY- 
SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, 
DATE 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
09... 
<0.010 <0.010 <0.01 <0.010 <0.010 <0.010 0.02 <0.01 
NAPH- 
THA- 
METHYL METHYL 
LENES, 
PARA- 
TRI- 
PARA- 
POLY- 
PER- 
TOX- 
TOTAL 
THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI-
DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION 
(UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 
JUL 1986 
09... 
<0.01 
<0.01 
<0.01 
<0.01 
<0.10 
<0.1 
<1 
<0.01 
285 
Discharge 
at 
Partial-Record 
Stations in Puerto Rico 
  
 
    
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
I
289 
DISCHARGE AT CREST-STAGE PARTIAL-RECORD STATIONS 
The following table contains annual maximum discharge for crest-stage stations. A crest-stage gage is a device 
which will register the peak stage occurring between inspections of the gage . A stage-discharge relation for each 
gage is developed from discharge measurements made by indirect measurements of peak flow or by current meter. The 
date of the maximum discharge is not always certain but is usually determined by comparison with nearby continuous-
record stations, weather record, or local inquiry. Only the maximum discharge for each water year is given. Infor­
mation on some lower floods may have been obtained, and discharge measurements may have been made for purposes of 
establishing the stage-discharge relation, but these are not published herein. The years given in the period of rec­
ord represent years for which the annual maximum has been determined. 
Annual maximum discharge at crest-stage partial-record stations during water year 1986 
Annual maximum 
Drainage 
Period 
Gage 
Dis-
Station 
Station name 
Location 
area 
of 
Date 
height 
charge 
number 
mi' 
record 
ft 
ft3 /s 
(km') 
(m) 
(m 3 /s) 
Rio Bucana basin 
50114390 
Rio Bucana 
Lat 18°02'29', long 66°34'58", 
24.9 
1985-86 
10/07/85 
129.88 
17,400 
Floodway Channel 
on left upstream side of 
(64.5) 
(39.59) 
(493) 
at Highway 14 
Highway 14 bridge , .2 mi 
bridge near 
(.3 km) southeast of Escuela 
Ponce, PR 
Cerrillos, and 2.8 mi (4.5 km) 
northeast of Degetau Plaza 
in Ponce. 
Rio Portugues basin 
50115900 
Rio Portugues at 
Lat 18'01'09', long 66°36'26", 
18.6 
1963-86 
10/07/85 
17.67 
12,000 
Highway 14 at 
on left downstream side of 
(48.2) 
(5.386) 
(340) 
Ponce, PR 
Highway 14 bridge, 1.7 mi 
(2.7 km) downstream from 
Rio Chiquito, and 0.6 i 
(0.97 km) northeast of 
Degetau Plaza in Ponce. 
Water-Quality at 
Partial-Record 
Stations in 
Puerto 
Rico 
 
  
  
 
 
 
   
 
    
 
       
         
         
 
       
         
         
 
        
        
   
   
 
       
         
         
 
  
    
         
         
293 
ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS 
Water-quality partial-record stations are particular sites where chemical-quality, biological 
and or sediment data are collected systematically over a period of years for use in hydrological 
analysis. The data are collected usually less than quarterly. 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
DEPTH 
OXYGEN, COLI-
AT 
SPE-
TRANS-
DIS-
FORM, 
SAMPLE CIFIC 
PAR-
SOLVED FECAL, 
LOC- CON- PH TEMPER- ENCY OXYGEN, (PER- 0.7 
ATION, DUCT- (STAND- ATURE (SECCHI DIS- CENT UM-MF 
DATE 
TIME TOTAL 
ANCE 
ARD 
WATER DISK) SOLVED SATUR- (COLS./ 
(FEET) 
(US/CM) UNITS) 
(DEG C) 
(IN) 
(MG/L) 
ATION) 100 ML) 
RIO GUAJATACA BASIN 
50010720 
LAGO GUAJATACA NO.3 NR MOUTH NR QUEBRADILLAS,PR (LAT 18°22'05"N LONG 066°54'36"W) 
NOV 1985 
20... 
1015 
1.00 
267 
8.05 
26.0 
52.0 
K8 
MAR 1986 
06... 
1125 
1.00 
285 
8.35 
26.5 
77.0 
7.2 
92 
68 
AUG 
22... 
0905 
1.00 
254 
8.05 
29.0 
90.0 
7.8 
104 
K9 
RIO GRANDE DE ARECIBO BASIN 
50025110 
LAGO DOS BOCAS NO.3 AT WEST BRANCH NR UTUADO,PR (LAT 18°19'15"N LONG 066°40 1 11"W) 
NOV 1985 
19... 
1010 
1.00 
198 
7.50 
25.5 
10.0 
K1300 
MAR 1986 
07... 
1050 
1.00 
191 
8.70 
26.0 
56.0 
7.0 
87 
K9 
AUG 
21... 
0905 
1.00 
212 
7.95 
30.0 
44.0 
8.7 
117 
31 
RIO DE LA PLATA BASIN 
50039900 
LAGO CARITE NO.3 ON RIO DE LA PLATA NR CAYEY,PR (LAT 18°05 104"N LONG 066°06'03"W) 
NOV 1985 
14... 
1245 
1.00 
77 
6.80 
23.5 
27.0 
8.2 
100 
MAR 1986 
12... 
1205 
1.00 
87 
8.60 
24.5 
63.0 
6.6 
84 
AUG 
18... 
1205 
1.00 
7.65 
27.5 
83.0 
7.6 
50044400 
LAGO LA PLATA NO.5 NR MOUTH NR NARANJITO, PR (LAT 18°19'33"N LONG 066°12 1 28"W) 
NOV 1985 
13... 
1505 
1.00 
333 
8.00 
25.0 
11.0 
K8500 
MAR 1986 
11... 
1300 
1.00 
390 
8.50 . 
27.0 
39.0 
6.9 
87 
42 
AUG 
15... 
1200 
1.00 
368 
7.90 
29.5 
54.0 
8.2 
109 
31 
RIO GRANDE DE LOIZA BASIN 
50057500 
LAGO LOIZA NO.4 NR MOUTH NR CAGUAS, PR (LAT 18- 16 1 514 LONG 066°00'35"W) 
NOV 1985 
15... 
1130 
214 
7.55 
24.0 
4.00 
20000 
MAR 1986 
04... 
'1425 
1.00 
382 
7.40 
26.0 
30.0 
5.0 
62 
>10 
AUG 
19... 
1040 
1.00 
266 
6.95 
30.0 
23.0 
2.7 
37 
K1500 
K = non-ideal count 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
294 
ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
STREP- ALKA- SOLIDS, 
TOCOCCI UNITY RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO-
FECAL, 
WATER 
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
GEN, 
KF AGAR 
TOTAL 
DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC 
(COLS. 
FIELD 
SUS-
TOTAL 
TOTAL 
TOTAL 
TOTAL 
TOTAL 
DATE 
PER 
MG/L AS PENDED 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
100 ML) 
CAC03 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N J 
AS N) 
RIO GUAJATACA BASIN--CONTINUED 
50010720 
LAGO GUAJATACA NO.3 NR MOUTH NR QUEBRADILLAS,PR (LAT 18°22'05"N LONG 066°54'36"W) 
NOV 1985 
20... 
50 
118 
1 
<0.010 
<0.100 
0.010 
0.69 
MAR 1986 
06... 
37 
123 
2 
<0.010 
<0.100 
0.030 
0.47 
AUG 
22... 
28 
116 
2 
<0.010 
<0.100 
0.020 
0.48 
RIO GRANDE DE ARECIBO BASIN-CONTINUED 
50025110 
LAGO DOS BOCAS NO.3 AT WEST BRANCH NR UTUADO,PR (LAT 18°19'15"N LONG 066°40 1 11"W) 
NOV 1985 
19... 
650 
59 
18 
0.760 
0.040 
0.800 
0.020 
0.58 
MAR 1986 
07... 
45 
66 
4 
0.190 
0.010 
0.200 
0.020 
0.38 
AUG 
21... 
100 
82 
1 
<0.010 
<0.100 
0.010 
0.39 
RIO DE LA PLATA BASIN--CONTINUED 
50039900 
LAGO CARITE NO.3 ON RIO DE LA PLATA NR CAYEY,PR (LAT 18°05'04"N LONG 066°06'03"W) 
NOV 1985 
14... 
27 
5 
0.090 
0.010 
0.100 
0.020 
0.28 
MAR 1986 
12... 
31 
6 
-
<0.010 
<0.100 
<0.010 
AUG 
18... 
32 
4 
<0.010 
<0.100 
0.020 
0.18 
50044400 
LAGO LA PLATA NO.5 NR MOUTH NP NARANJITO, PR (LAT 18°19'33"N LONG 066°12 1 28"W) 
NOV 1985 
13... 
4200 
116 
33 
0.880 
0.020 
0.900 
0.030 
0.47 
MAR 1986 
11... 
K5 
144 
4 
0.070 
0.030 
0.100 
0.020 
0.48 
AUG 
15... 
K15 
142 
<1 
<0.010 
<0.100 
0.020 
0.28 
RIO GRANDE DE LOIZA BASIN--CONTINUED 
50057500 
LAGO LOIZA NO.4 NR MOUTH NR CAGUAS, PR (LAT 18°16'51"N LONG 066°00'35"W) 
NOV 1985 
15... 
32000 
69 
204 
0.520 
0.080 
0.600 
0.320 
1.1 
MAR 1986 
04... 
69 
105 
1 
0.350 
0.050 
0.400 
1.30 
0.80 
AUG 
19... 
K250 
81 
18 
0.410 
0.090 
0.500 
0.880 
0.52 
K = non-ideal count 
 
 
 
 
 
 
  
 
 
 
 
  
 
 
 
 
  
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO- 
CHLOR-A CHLOR-B 
GEN,AM- 
PHYTO- PHYTO- 
MONIA + 
NITRO- 
NITRO- 
PHOS- 
PLANK- 
PLANK- PLANK- 
PLANK- 
ORGANIC GEN, GEN, PHORUS, TON TON TON TON 
TOTAL TOTAL TOTAL TOTAL CHROMO CHROMO BIOMASS BIOMASS 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
FLUOROM FLUOROM ASH WT 
DRY WT 
AS N) 
AS N) 
AS NO3) 
AS P) 
(UG/L) 
(UG/L) (MG/L) 
(MG/L) 
RIO GUAJATACA BASIN--CONTINUED 
50010720 
LAGO GUAJATACA NO.3 NR MOUTH NR QUEBRADILLAS,PR (LAT 18°22'05"N LONG 066°54 1 36"W) 
NOV 1985 
20... 
0.70 
0.030 
30.0 
4.20 
MAR 1996 
06... 
0.50 
0.020 
17.0 
2.40 
AUG 
22... 
0.50 
0.020 
9.30 
0.800 
3.5 
220 
RIO GRANDE DE ARECIBO BASIN--CONTINUED 
50025110 
LAGO DOS BOCAS NO.3 AT WEST BRANCH NR UTUADO,PR (LAT 18'19'154 LONG 066°40'11"W) 
NOV 1985 
19... 
0.60 
1.4 
6.2 
0.070 
16.0 
0.400 
MAR 1986 
07... 
0.40 
0.60 
2.7 
0.030 
14.0 
3.90 
3.0 
230 
AUG 
21... 
0.40 
0.030 
17.0 
1.40 
7.0 
6280 
RIO DE LA PLATA BASIN--CONTINUED 
50039900 
LAGO CARITE NO.3 ON RIO DE LA PLATA NR CAYEY,PR (LAT 18°05'04"N LONG 066°06 1 03"W) 
NOV 1985 
14... 
0.30 
0.40 
1.8 
0.010 
11.0 
0.700 
MAR 1986 
12... 
<0.20 
0.010 
17.0 
5.80 
75 
330 
AUG 
18... 
0.20 
0.020 
10.0 
2.70 
9.8 
240 
50044400 
LAGO LA PLATA NO.5 NR MOUTH NR NARANJITO, PR (LAT 18°19'33"N LONG 066°12'28"W) 
NOV 1985 
13... 
0.50 
1.4 
6.2 
0.170 
18.0 
4.10 
MAR 1986 
11... 
0.50 
0.60 
2.7 
0.160 
30.0 
3.80 
3.2 
250 
AUG 
15... 
0.30 
0.090 
72.0 
14.0 
13 
180 
RIO GRANDE DE LOIZA BASIN--CONTINUED 
50057500 
LAGO LOIZA NO.4 NR MOUTH NR CAGUAS, PR (LAT 18°I6'51"N LONG 066°00'35"W) 
NOV 1985 
15... 
1.4 
2.0 
8.9 
0.350 
1.60 
0.300 
MAR 1986 
04... 
2.1 
2.5 
11 
0.660 
76.0 
2.20 
AUG 
19... 
1.4 
1.9 
8.4 
0.470 
3.40 
0.300 
3.9 
260 
295 
 
 
 
 
 
  
 
  
 
 
 
 
 
 
 
 
  
 
 
  
 
 
 
  
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
DEPTH 
OXYGEN, 
COLI- 
STREP- 
AT 
SPE- 
TRANS- 
CIS- 
FORM, 
TOCOCCI 
SAMPLE CIFIC 
PAR- 
SOLVED FECAL, FECAL, 
LOC- 
CON- 
PH 
TEMPER- 
ENCY 
OXYGEN, 
(PER- 
0,7 
KF AGAR 
ATION, DUCT- (STAND- ATURE (SECCHI DIS- CENT UM-MF (COLS. 
DATE 
TIME TOTAL 
ANCE 
ARD 
WATER DISK) SOLVED SALM- (COLS./ PER 
(FEET) 
(US/CM) UNITS) 
(DEG C) 
(IN) 
(MG/L) 
ATION) 100 ML) 100 ML) 
RIO GUAJATACA BASIN--CONTINUED 
50010790 
NOV 1985 
20... 
20... 
MAR 1986 
06... 
06... 
AUG 
22... 
22... 
0930 
0935 
1030 
1040 
0930 
0935 
LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066°55'23"W) 
1.00 
264 
7.95 
26.0 
52.0 
K3 
<1 
74.0 
321 
7.85 
24.0 
-- 
-- 
-- 
1.00 
280 
8.30 
26.0 
78.0 
6.8 
86 
K7 
K13 
78.0 
309 
7.45 
24.0 
-- 
0.4 
5 
-- 
-- 
1.00 
259 
7.95 
28.5 
140 
7.4 
98 
K7 
24 
44.0 
303 
7.15 
24.5 
0.2 
2 
-- 
-- 
RIO GRANDE DE ARECIBO BASIN--CONTINUED 
50020050 
LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18°08'21"N LONG 066°44'35"W) 
NOV 1985 
18... 
1415 
1.00 
109 
7.00 
21.5 
18.0 
340 
360 
18... 
1430 
76.0 
94 
6.60 
20.5 
-- 
-- 
MAR 1986 
05... 
1450 
1.00 
137 
8.75 
24.5 
58.0 
K4/ 
KE1 
05... 
1440 
100.0 
155 
7.25 
21.5 
-- 
-- 
-- 
AUG 
20... 
1230 
1.00 
141 
8.05 
26.5 
29.0 
K7 
<1 
20... 
1220 
86.0 
155 
7.00 
22.0 
-- 
-- 
50027090 
LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18°20'09"N LONG 066°40'04"W) 
NOV 1985 
19... 
1110 
1.00 
172 
7.85 
26.5 
13.0 
8C 
K8 
19... 
1120 
82.0 
156 
7.15 
23.0 
-- 
MAR 1986 
07... 
0955 
1.00 
195 
8.75 
26.0 
56.0 
7.2 
90 
27 
K15 
07... 
0950 
86.0 
206 
7.20 
23.5 
-- 
0.4 
5 
-- 
-- 
AUG 
21... 
1050 
1.00 
212 
8.00 
30.0 
56.0 
7.2 
97 
K7 
K4 
21... 
1045 
78.0 
227 
6.80 
28.0 
-- 
0.6 
8 
-- 
-- 
RIO DE LA PLATA BASIN--CONTINUED 
50039950 
NOV 1985 
14... 
14... 
MAR 1986 
12... 
12... 
AUG 
18... 
18... 
1200 
1205 
1120 
1125 
1115 
1125 
LAGO CARITE NO.1 NR DAM NR CAYEY.PR (LAT 18°04'39"N LONG 066°06'19"W) 
1.00 
67 
6.75 
25.0 
22 
K8 
67.0 
78 
6.55 
22.0 
-- 
-- 
-- 
1.00 
88 
-- 
24.0 
55.0 
50 
K12 
63.0 
90 
7.05 
22.0 
-- 
-- 
1.00 
100 
7.45 
27.5 
111 
K1 
K14 
69.0 
92 
6.10 
23.0 
- 
-- 
50044950 
LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18"N LONG 066°14'01"W) 
NOV 1985 
13... 
1250 
1.00 
285 
7.65 
26.5 
16.0 
340 
300 
13... 
1405 
66.0 
128 
6.70 
23.0 
-- 
-- 
MAR 1986 
11... 
1145 
1.00 
369 
8.20 
26.5 
51.0 
5.8 
73 
K' 
21 
11... 
1150 
59.0 
309 
7.20 
23.5 
0 
0 
AUG 
15... 
1300 
1.00 
621 
7.65 
30.0 
73.0 
7.3 
98 
15... 
1250 
57.0 
158 
6.80 
22.5 
0 
0 
RIO GRANDE DE LOIZA BASIN--CONTINUED 
50058800 
LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°191 29"N LONG 066°00 1 47"W) 
NOV 1985 
15... 
1040 
1.00 
261 
7.20 
26.0 
20.0 
2300 
400 
15... 
1035 
24.0 
251 
7.20 
25.5 
-- 
MAR 1986 
04... 
1530 
1.00 
338 
8.05 
26.0 
40.0 
7.8 
97 
30 
22 
04... 
1525 
27.0 
343 
7.20 
24.5 
0.2 
2 
-- 
AUG 
19... 
1000 
1.00 
265 
7.55 
30.0 
32.0 
K12 
K120 
19... 
0950 
33.0 
304 
6.85 
29.0 
-- 
-- 
-- 
K = non-ideal court 
296 
 
 
 
 
  
        
        
         
      
 
        
        
        
        
        
        
   
   
   
   
   
    
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
297 
ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
HARD-
ALKA-
NESS 
MAGNE-
SODIUM POTAS- LINITY 
CHLO-
HARD- NONCARB CALCIUM SIUM, SODIUM, 
AD-
SIUM, WATER SULFATE RIDE, 
NESS 
WATER 
DIS-
DIS-
DIS-
SORP-
DIS-
TOTAL ' DIS-
DIS-
(MG/L 
TOT FLD 
SOLVED 
SOLVED SOLVED 
TION 
SOLVED 
FIELD 
SOLVED 
SOLVED 
DATE 
AS 
MG/L AS 
(MG/L 
(MG/L 
(MG/L . RATIO 
(MG/L 
MG/L AS 
(MG/L 
(MG/L 
CAC03) 
CAC03 
AS CA) 
AS MG) 
AS NA) 
AS K) 
CAC03 AS SO4) 
AS CL) 
RIO GUAJATACA BASIN--CONTINUED 
50010790 
LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066°55 1 23"W) 
NOV 1985 
20... 
120 
10 
43 
3.1 
5.0 
0.2 
1.5 
110 
9.6 
7.1 
20... 
150 
35 
55 
3.0 
4.5 
0.2 
1.5 
115 
10 
6.5 
MAR 1986 
06... 
130 
14 
48 
3.5 
5.4 
0.2 
1.6 
120 
8.4 
7.3 
06... 
150 
' 28 
54 
3.5 
5.6 
0.2 
1.9 
121 
9.5 
8.0 
AUG 
22... 
120 
1 
41 
3.1 
4.9 
0.2 
1.6 
114 
9.0 
6.9 
22... 
130 
0 
49 
2.8 
4.2 
0.2 
1.5 
143 
8.4 
5.4 
RIO GRANDE DE ARECIBO BASIN--CONTINUED 
50020050 
LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18°08'21"N LONG 066°44 1 35"W) 
NOV 1985 
18... 
40 
0 
11 
3.1 
5.0 
0.4 
0.90 
41 
5.2 
4.6 
18... 
37 
0 
10 
3.0 
4.4 
0.3 
1.0 
38 
5.0 
4.5 
MAR 1986 
05... 
58 
0 
16 
4.4 
6.1 
0.4 
1.0 
59 
3.3 
5.5 
05... 
61 
0 
17 
4.6 
6.2 
0.4 
1.0 
62 
3.3 
5.3 
AUG 
20... 
62 
0 
17 
4.8 
6.6 
0.4 
1.1 
66 
3.9 
5.8 
20... 
61 
0 
17 
4.5 
5.4 
0.3 
1.5 
72 
4.9 
5.1 
50021090 
LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PF (LAT 18°20'09"N LONG 066°40 1 04"W) 
NOV 1985 
19... 
61 
6 
16 
5.0 
8.1 
0.5 
1.7 
55 
11 
7.8 
19... 
59 
4 
17 
4.1 
7.2 
0.4 
1.6 
55 
8.3 
10 
MAR 1986 
07... 
76 
8 
20 
6.4 
11 
0.6 
1.8 
68 
13 
9.6 
07... 
80 
6 
21 
6.6 
10 
0.5 
2.1 
74 
12 
9.4 
AUG 
21... 
79 
2 
21 
6.4 
10 
0.5 
2.0 
77 
14 
10 
21... 
90 
0 
24 
7.2 
11 
0.5 
2.3 
94 
14 
10 
RIO DE LA PLATA BASIN--CONTINUED 
50039950 
LAGO CARITE NO.1 NR DAM NR CAYEY.PR (LAT 18°04'39"N LONG 066°06'19"W) 
NOV 1985 
14... 
23 
1 
4.1 
3.0 
6.5 
0.6 
0.70 
22 
1.9 
7.2 
14... 
25 
0 
5.0 
3.1 
7.2 
0.6 
0.70 
27 
4.7 
7.6 
MAR 1986 
12... 
28 
0 
5.6 
3.4 
7.7 
0.6 
0.70 
30 
3.8 
8.8 
12... 
29 
0 
6.0 
3.4 
7.4 
0.6 
0.70 
30 
3.8 
8.5 
AUG 
18... 
28 
0 
5.8 
3.2 
12 
1 
0.90 
32 
5.7 
8.8 
18... 
28 
0 
5.9 
3.3 
6.2 
0.5 
1.4 
36 
8.7 
10 
50044950 
LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18"N LONG 066°14:01"W) 
NOV 1985 
13... 
100 
7 
25 
10 
15 
0.7 
1.9 
97 
15 
18 
13... 
45 
1 
11 
4.2 
6.9 
0.5 
2.1 
44 
8.9 
7.1 
MAR 1986 
11... 
140 
10 
34 
14 
22 
0.8 
2.2 
133 
13 
23 
11... 
120 
9 
29 
12 
16 
0.7 
2.3 
113 
11 
17 
AUG 
15... 
130 
5 
29 
13 
20 
0.8 
1.3 
121 
16 
24 
15... 
52 
0 
13 
4.7 
6.8 
0.4 
2.2 
56 
8.8 
11 
RIO GRANDE DE LOIZA BASIN--CONTINUED 
50058800 
LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'294 LONG 066°00 1 47"W) 
NOV 1985 
15... 
87 
5 
20 
9.0 
19 
0.9 
2.3 
82 
14 
18 
15... 
81 
2 
19 
8.2 
18 
0.9 
2.7 
79 
16 
16 
MAR 1986 
04... 
99 
10 
23 
10 
26 
1 
2.3 
89 
16 
24 
04... 
99 
4 
23 
10 
25 
1 
2.3 
95 
16 
25 
AUG 
19... 
78 
0 
18 
8.0 
22 
1 
2.8 
85 
18 
20 
19... 
82 
0 
19 
8.3 
22 
1 
3.0 
93 
16 
21 
 
  
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
298 
ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
SOLIDS, 
SOLIDS, 
FLUO-
SILICA, SUM OF 
RESIDUE 
NITRO-
NITRO-
NITRO-
NITRO-
RIDE, 
DIS-
CONSTI-
AT 105 
GEN, 
GEN, 
GEN, 
GEN, 
DIS-
SOLVED TUENTS, 
DEG. C, NITRATE NITRITE NO20403 AMMONIA 
SOLVED (MG/L DIS- SUS- TOTAL TOTAL TOTAL TOTAL 
DATE 
(MG/L 
AS 
SOLVED 
PENDED 
(MG/L 
S(MG/L 
(MG/L 
(MG/L 
AS F) 
SI02) 
(MG/L) 
(MG/L) 
AS N) 
AS N) 
AS N) 
AS N) 
RIO GUAJATACA BASIN--CONTINUED 
50010790 
LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066°55'23"W) 
NOV 1985 
20... 
<0.10 
2.0 
140 
2 
<0.010 
<0.100 
0.010 
20... 
<0.10 
5.0 
150 
--
MAR 1986 
06... 
0.20 
4.8 
150 
2 
<0.010 
<0.100 
0.020 
06... 
0.20 
6.3 
160 
AUG 
22... 
0.10 
6.4 
140 
1 
<0.010 
<0.100 
0.020 
22... 
0.10 
6.9 
160 
--
RIO GRANDE DE ARECIBO BASIN--CONTINUED 
50020050 
LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18°081 21"N LONG 066°44 1 35"W) 
NOV 1985 
18... 
<0.10 
15 
69 
7 
<0.010 
0.300 
0.020 
18... 
<0.10 
14 
65 
--
MAR 1986 
05... 
0.20 
19 
91 
4 
<0.010 
<0.100 
0.020 
05... 
0.20 
19 
94 
AUG 
20... 
<0.10 
17 
96 
6 
<0.010 
<0.100 
0.030 
20... 
<0.10 
17 
99 
--
50027090 
LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18°20'09"N LONG 066°40'04"W) 
NOV 1985 
19... 
<0.10 
20 
100 
4 
0.670 
0.030 
0.700 
0.030 
19... 
<0.10 
21 
100 
--
MAR 1986 
07... 
0.20 
18 
120 
5 
0.090 
0.010 
0.100 
0.020 
07... 
0.10 
22 
130 
AUG 
21... 
0.10 
22 
130 
3 
<0.010 
.40.100 
0.020 
21... 
0.10 
24 
150 
RIO DE LA PLATA BASIN--CONTINUED 
50039950 
LAGO CARITE NO.1 NR DAM NR CAYEY.PR (LAT 18°04'39"N LONG 066'06'19"W) 
NOV 1985 
14... 
<0.10 
14 
51 
5 
0.010 
<0.100 
0.020 
14... 
<0.10 
17 
61 
--
MAR 1986 
12... 
0.20 
16 
64 
4 
<0.010 
<0.100 
<0.010 
12... 
0.20 
17 
65 
--
--
--
AUG 
18... 
<0.10 
19 
75 
3 
<0.010 
<0.100 
0.020 
18... 
<0.10 
13 
70 
--
50044950 
LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20 1 18"N LONG 066°14'01"W) 
NOV 1985 
13... 
0.10 
22 
170 
12 
0.790 
0.010 
0.800 
0.020 
13... 
0.10 
14 
81 
--
MAR 1986 
11... 
0.10 
20 
210 
4 
<0.010 
<0.100 
<0.010 
11... 
0.10 
22 
180 
--
--
--
AUG 
15... 
0.20 
18 
190 
1 
<0.010 
<0.100 
0.020 
15... 
0.20 
13 
93 
--
RIO GRANDE DE LOIZA BASIN--CONTINUED 
50058800 
LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29"N LONG 066 00'47"W) 
NOV 1985 
15... 
0.10 
29 
160 
14 
0.730 
0.070 
0.800 
0.090 
15,.. 
0.10 
27 
150 
--
MAR 1986 
04... 
0.20 
23 
180 
5 
0.260 
0.040 
0.300 
0.020 
04... 
0.20 
24 
180 
AUG 
19... 
0.20 
20 
160 
5 
0.030 
0.070 
0.100 
0.020 
19... 
0.20 
23 
170 
 
 
       
 
    
      
 
       
 
 
 
   
  
   
    
 
 
   
   
    
  
   
 
  
  
 
       
  
   
 
         
  
   
    
  
  
 
   
  
 
 
   
    
 
       
  
   
 
 
 
    
 
 
   
 
       
 
   
       
  
   
         
 
   
299 
ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS 
WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
NITRO-
CHLOR-A CHLOR-B 
NITRO- GEN,AM-
PHYTO- PHYTO-
GEN, 
MONIA + 
NITRO-
NITRO-
PHOS-
PLANK-
PLANK- PLANK-
PLANK-
ORGANIC ORGANIC GEN, 
GEN, PHORUS, 
TON 
TON 
TON 
TON 
TOTAL TOTAL TOTAL TOTAL TOTAL CHROMO CHROMO BIOMASS BIOMASS 
DATE 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
(MG/L 
FLUOROM FLUOROM ASH WT 
DRY WT 
AS N) 
AS N) 
AS N) 
AS NO3) 
AS P) 
(UG/L) 
(UG/L) (MG/L) 
(MG/L) 
RIO GUAJATACA BASIN--CONTINUED 
50010790 
LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066°55'23"W) 
NOV 1985 
20... 
0.59 0.60 
0.020 24.0 2.10 
20... 
MAR 1986 
06... 
0.28 
0.30 
0.020 
9.20 
0.400 
06... 
AUG 
22... 
0.38 
0.40 
0.010 
2.40 
0.200 
4.7 
270 
22... 
RIO GRANDE DE ARECIBO BASIN--CONTINUED 
50020050 
LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18°08'21"N LONG 066°44 1 35"W) 
NOV 1985 
18... 0.48 0.50 0.80 3.5 0.030 15.0 0.500 
18... 
--
--
--
--
MAR 1986 
05... 
0.38 
0.40 
0.020 
27.0 
2.40 
5.0 
270 
05... 
--
--
--
--
--
AUG 20... 0.37 0.40 
0.020 19.0 0.300 8.2 280 
20... 
--
--
--
--
50027090 
LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18°20'09"N LONG 066°40'04"W) 
NOV 1985 
19... 
0.67 
0.70 
1.4 
6.2 
0.080 
36.0 
1.30 
19... 
--
--
--
--
--
MAR 1986 
07... 
0.38 
0.40 
0.50 
2.2 
0.020 
11.0 
0.300 
4.2 
270 
07... 
--
--
AUG 
21... 
0.28 
0.30 
0.020 
15.0 
1.30 
6.4 
280 
21... 
--
--
--
--
RIO DE LA PLATA BASIN--CONTINUED 
50039950 
LAGO CARITE NO.1 NR DAM NR CAYEY.PR (LAT 18°04'39"N LONG 066°06 1 19"W) 
NOV 1985 
14... 
0.38 
0.40 
0.010 
9.40 
0.100 
14... 
-­
MAR 1986 
12... 
<0.20 
0.020 14.0 4.90 3.2 260 
12... 
AUG 
18... 
0.38 
0.40 
0.030 
3.10 
0.700 
8.4 
250 
18... 
50044950 
LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20 118"N LONG 066°14 101"W) 
NOV 1985 
13... 
0.68 
0.70 
1.5 
6.6 
0.140 
43.0 
9.10 
13... 
--
--
--
--
--
MAR 1986 
11... 
0.50 
0.060 32.0 4.40 4.6 260 
11... 
--
--
--
--
--
AUG 15... 0.38 0.40 
0.030 32.0 2.30 12 280 
15... 
--
--
--
--
RIO GRANDE DE LOIZA BASIN--CONTINUED 
50058800 
LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29"N LONG 066°00 1 47"W) 
NOV 1985 
15... 
0.61 
0.70 
1.5 
6.6 
0.170 
33.0 
1.40 
15... 
--
--
--
--
MAR 1986 
04... 
0.88 
0.90 
1.2 
5.3 
0.190 
58.0 
3.50 
04... 
--
--
--
--
--
AUG 
19... 
0.68 
0.70 
0.80 
3.5 
0.181 
42.0 
3.30 
13 
550 
19... 
--
0.430 
--
--
 
  
    
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
303 
GROUND-WATER LEVELS 
RIO GUAJATACA BASIN 
182422067015100. Local number, 165. 
LOCATION.--Lat 18°24'22", long 67°01'51". 
Owner: P.R. Aqueduct and Sewer Authority. 
Name: Saltos # 1 (Mateo Perez). 
AQUIFER.--Cibao Formation, Aguada Limestone. 
WELL CHARACTERISTICS.--Drilled production water-table well, diameter 16 in (0.40 m), cased 16 in (0.40 m) 0-40 ft 
(0-12.2 m), cased 12 in (0.30 m) 40-200 ft (12.2-61.0 m). Depth 200 ft (61.0 m) 
DATUM.--Elevation of land-surface datum is 689 ft (210 m) above mean sea level. 
Measuring point: Hole on pump base, 0.80 ft ((0.24 m) above land-surface datum. Prior November 1985, hole on 
top of pump base, 1.00 ft (0.30 m) above land-surface datum. 
REMARKS.--Pumping discontinued. Observation well. Automatic recorder installed on November 14, 1985. Formerly 
published as 182421067015000. 
PERIOD OF RECORD. lanuary 1982 to March 1985. November 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 53.39 ft (16.27 m) below land-surface datum, Sept. 23, 
1986; lowest water level recorded, 70.60 ft (21.52 m) below land-surface datum, June 18, 1982. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
59.85 
59.23 
58.76 
57.91 
57.29 
56.70 
55.82 
55.20 
54.48 
53.83 
2 
59.85 
59.19 
58.66 
57.87 
57.25 
56.69 
55.81 
55.21 
54.50 
53.90 
3 
59.84 
59.07 
58.67 
57.91 
57.27 
56.65 
55.79 
55.17 
54.50 
53.93 
4 
59.82 
59.11 
58.65 
57.91 
57.28 
56.63 
55.74 
55.16 
54.46 
53.91 
5 
59.78 
59.13 
58.59 
57.89 
57.25 
56.60 
55.75 
55.11 
54.46 
53.85 
6 
59.59 
59.11 
58.59 
57.85 
57.24 
56.55 
55.76 
55.09 
54.42 
53.84 
7 
59.61 
59.08 
58.60 
57.84 
57.19 
56.47 
55.72 
55.08 
54.37 
53.85 
8 
59.61 
59.09 
58.64 
57.88 
57.18 
56.31 
55.71 
55.09 
54.35 
53.82 
9 
59.60 
59.10 
58.56 
57.91 
57.15 
56.30 
55.70 
55.07 
54.34 
53.82 
10 
59.61 
59.06 
58.54 
57.89 
57.11 
56.31 
55.70 
55.06 
54.33 
53.81 
11 
59.57 
59.03 
58.59 
57.79 
57.11 
56.30 
55.65 
54.99 
54.32 
53.70 
12 
59.59 
59.07 
58.50 
57.76 
57.08 
56.31 
55.64 
54.96 
54.33 
53.63 
13 
59.57 
59.06 
58.43 
57.78 
57.02 
56.23 
55.59 
54.96 
54.29 
53.70 
14 
59.51 
58.98 
58.44 
57.74 
56.98 
56.26 
55.54 
54.92 
54.26 
53.72 
15 
60.15 
59.50 
59.05 
58.45 
57.70 
57.00 
56.28 
55.53 
54.83 
54.18 
53.71 
16 
60.05 
59.50 
59.03 
58.40 
57.65 
57.04 
56.25 
55.51 
54.81 
54.15 
53.68 
17 
60.00 
59.49 
58.99 
58.36 
57.66 
57.05 
56.20 
55.47 
54.79 
54.16 
53.64 
18 
60.16 
59.44 
58.87 
58.40 
57.66 
57.04 
56.18 
55.41 
54.79 
54.17 
53.66 
19 
60.21 
59.44 
58.89 
58.48 
57.68 
56.97 
56.19 
55.43 
54.72 
54.18 
53.65 
20 
60.16 
59.41 
59.05 
57.80 
57.68 
56.97 
56,19 
55.42 
54.68 
54.19 
53.64 
21 
60.11 
59.39 
58.89 
57.94 
57.60 
56.98 
56.14 
55.36 
54.70 
54.17 
53.58 
22 
60.12 
59.30 
58.81 
57.95 
57.57 
56.96 
56.09 
55.33 
54.81 
54.09 
53.49 
23 
60.06 
59.23 
58.82 
57.95 
57.58 
56.94 
56.09 
55.34 
54.79 
53.99 
53.45 
24 
60.04 
59.24 
58.82 
57.94 
57.61 
56.88 
56.07 
55.32 
54.66 
53.98 
53.50 
25 
60.00 
59.28 
58.72 
57.85 
57.60 
56.86 
56.01 
55.30 
54.6 9 
54.05 
53.58 
26 
59.98 
59.23 
58.71 
57.83 
57.54 
56.82 
55.94 
55.29 
54.71 
54.10 
53.58 
27 
59.96 
59.23 
58.74 
57.88 
57.48 
56.79 
55.95 
55.27 
54.67 
54.04 
53.46 
28 
59.96 
59.24 
58.78 
57.94 
57.45 
56.75 
55.93 
55.23 
54.63 
53.97 
53.46 
29 
59.96 
59.30 
58.74 
57.41 
56.74 
55.90 
55.24 
54.58 
53.98 
53.52 
30 
59.87 
59.22 
58.77 
57.37 
56.70 
55.87 
55.20 
54.55 
54.00 
53.57 
31 
59.23 
58.83 
57.35 
55.87 
54.51 
53.92 
LOW 
59.85 
59.23 
58.76 
57.91 
57.29 
56.70 
55.82 
55.21 
54.50 
53.93 
HIGH 
59.22 
58.71 
57.80 
57.35 
56.70 
55.87 
55.20 
54.51 
53.92 
53.45 
45
9x 
gip
1-4
la 0 50 
L'J 
Z 4
Lt. 
55 
-J 
w e, 
60 :7
ta
1 
cz z 
W5 
65 
3 
NOV 
DEC JAN FEB MAR APR MAY 
JUN 
JUL AUG SEP 
1985 
1966 
 
 
 
 
   
  
     
 
 
 
304 
GROUND-WATER LEVELS 
RIO GUAJATACA BASIN 
182647066552400. Local number, 202. 
LOCATION.--Lat 18°26'47", long 66°55'24". 
Owner: P.R. Aqueduct and Sewer Authority. 
Name: Carmelo Barreto Garcia well. 
AQUIFER.--Aguada Limestone. 
WELL CHARACTERISTICS.--Drilled water-table well, diameter 20 in (0.51 m), cased 20 in (0.51 m) 0-296 ft (0-90.2 m), 
diameter 13 in (0.33 m), cased 13 in (0.33 m) 0-550 ft (0-167.6 a), perforated 270-529 ft (82.3-161.2 m). Depth 
550 ft (167.6 m). 
DATUM.--Elevation of land-surface datum is about 475 ft (145 m) above mean sea level, from topographic map. 
Measuring point: Hole on side of casing, 1.50 ft (0.46 m) above land-surface datum. Prior July 25, 1986, top 
of shelter floor, 3.30 ft (1.00 a) above land-surface datum. 
REMARKS.--Abandoned observation well. Automatic recorder installed on November 13, 1985. 
PERIOD OF RECORD.--November 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 409.17 ft (127.76 m) below land-surface datum, Sept. 
25,-1986; 
lowest water level recorded, 452.80 ft (138.01 m) below land-surface datum, June 26, 1986. 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
---
432.09 
433.34 
434.55 
435.83 
434.36 
451.94 
451.18 
2 
433.90 
432.10 
433.35 
434.58 
435.85 
434.04 
451.81 
451.27 
3 
433.70 
432.13 
433.37 
434.68 
435.88 
433.70 
451.67 
451.34 
4 
433.55 
432.16 
433.45 
434.71 
435.92 
433.15 
451.59 
451.36 
5 
433.39 
432.20 
433.51 
434.76 
435.92 
432.23 
451.48 
451.41 
6 
433.24 
432.24 
433.58 
434.78 
435.92 
431.32 
451.40 
451.47 
7 
433.08 
432.26 
433.60 
434.84 
435.91 
430.56 
451.35 
451.50 
8 
432.96 
432.29 
433.63 
434.92 
435.90 
429.84 
451.29 
451.55 
9 
432.82 
432.36 
433.67 
434.98 
435.88 
429.17 
451.20 
451.63 
10 
432.69 
432.36 
433.72 
435.02 
435.81 
428.59 
451.13 
451.68 
11 
432.57 
432.36 
433.77 
435.03 
435.71 
428.05 
451.07 
451.75 
12 
432.43 
432.41 
433.81 
435.08 
435.69 
427.53 
451.03 
451.83 
13 
---
---
432.33 
432.43 
433.83 
435.14 
435.60 
426.93 
451.01 
451.87 
14 
---
435.31 
432.23 
432.49 
433.89 
435.17 
435.56 
426.24 
450.98 
451.90 
15 
---
435.18 
432.14 
432.55 
433.93 
435.20 
435.51 
425.25 
450.90 
451.94 
16 
435.02 
432.06 
432.61 
433.99 
435.24 
435.45 
423.99 
450.90 
451.98 
17 
434.83 
431.97 
432.63 
434.03 
435.30 
435.41 
422.77 
450.86 
452.08 
18 
434.71 
---
432.64 
434.03 
435.36 
435.39 
421.84 
450.86 
452.19 
19 
---
431.96 
432.69 
434.05 
435.42 
435.34 
420.95 
450.84 
---
20 
---
431.93 
432.72 
434.12 
435.47 
435.34 
---
450.84 
21 
431.91 
432.78 
434.16 
435.48 
435.33 
450.88 
22 
431.92 
432.83 
434.22 
435.54 
435.30 
450.98 
23 
431.91 
432.85 
434.26 
435.58 
435.27 
450.99 
24 
431.96 
432.90 
434.32 
435.63 
435.21 
450.96 
25 
431.96 
432.93 
434.31 
435.67 
435.17 
450.99 
26 
431.99 
432.97 
434.37 
435.69 
435.11 
---
451.03 
409.29 
27 
432.01 
433.00 
434.46 
435.71 
435.05 
452.60 
451.05 
409.33 
28 
431.99 
433.09 
434.53 
435.76 
434.98 
452.38 
451.06 
409.41 
29 
431.99 
433.15 
---
435.81 
434.90 
452.24 
451.08 
409.53 
30 
432.03 
433.20 
---
435.82 
434.71 
452.06 
451.12 
409.64 
31 
432.08 
433.28 
---
435.84 
---
---
451.15 
---
LOW 
433.28 
434.53 
435.84 
435.92 
451.94 
HIGH 
432.09 
433.34 
434.55 
434.71 
450.84 
400 
W 
co <
La 0 
1...J 420
c.)
z< 
-J 
>
La cn 440
La I
-J Z 
LaJ < 
< 460 
NOV 
DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1985 
1986 
 
 
305 
GROUND-WATER LEVELS 
RIO CAMUY BASIN 
182856066510900. Local number, 203. 
LOCATION.--Lat 18°28'56", long 66°51'09". 
Owner: P.R. Industrial Development Corporation. 
Name: Vicente Amedor Well. 
AQUIFER.--Aymamon Limestone. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 8 in (0.20 m), cased 8 in (0.20 m) 0-130 ft 
(0-39.6 m), perforated 110-130 (33.5-39.6 m); open hole 130-140 ft (39.6-42.7 m). Depth 140 ft (42.7 m). 
DATUM.--Elevation of land-surface datum is about 116 ft (35.4 m) above mean sea level, from topographic map. 
Measuring point: Top of shelter floor, 2.97 ft (0.90 m) above land-surface datum. 
REMARKS.--Abandoned observation well. Automatic recorder installed on November 14,1985. 
PERIOD OF RECORD.--November 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorder, 97.99 ft (29.87 m) below land-surface datum, June 27, 
1986; lowest water le el recorded, 99.70 ft (30.38 m) below land-surface datum, Dec. 6, 1985. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
98.85 
99.24 
99.36 
99.49 
99.48 
98.92 
98.24 
98.56 
98.76 
98.69 
2 
98.86 
99.26 
99.36 
99.51 
99.47 
98.84 
98.25 
98.58 
98.77 
98.69 
3 
98.87 
99.25 
99.39 
99.53 
99.45 
98.74 
98.26 
98.59 
98.79 
98.68 
4 
98.88 
99.27 
99.38 
99.56 
99.45 
98.64 
98.28 
98.60 
98.80 
98.70 
5 
98.87 
99.27 
99.37 
99.60 
99.45 
98.59 
98.31 
98.60 
98.81 
98.69 
6 
98.87 
99.27 
99.39 
99.61 
99.44 
98.56 
98.34 
98.61 
98.80 
98.69 
7 
98.86 
99.26 
99.36 
99.62 
99.44 
98.50 
98.37 
98.62 
98.80 
98.68 
8 
98.87 
99.27 
99.38 
99.61 
99.41 
98.44 
98.39 
98.65 
98.80 
98.71 
9 
98.87 
99.29 
99.35 
99.62 
99.35 
98.40 
98.44 
98.67 
98.80 
98.73 
10 
98.88 
99.27 
99.36 
99.62 
99.27 
98.37 
98.46 
98.69 
98.80 
98.75 
11 
98.93 
99.30 
99.37 
99.62 
99.21 
98.34 
98.47 
98.70 
98.79 
98.76 
12 
98.97 
99.28 
99.35 
99.61 
99.20 
98.31 
98.50 
98.70 
98.79 
98.76 
13 
99.03 
99.29 
99.37 
99.61 
99.18 
98.26 
98.52 
98.70 
98.78 
98.77 
14 
98.71 
99.07 
99.30 
99.37 
99.63 
99.16 
98.10 
98.53 
98.70 
98.76 
98.77 
15 
98.73 
99.08 
99.30 
99.37 
99.63 
99.16 
98.03 
98.55 
98.70 
98.73 
98.78 
16 
98.67 
99.10 
99.30 
99.38 
99.65 
99.18 
97.99 
98.56 
98.69 
98.73 
98.79 
17 
98.61 
99.11 
99.30 
99.38 
99.65 
99.20 
98.00 
98.56 
98.69 
98.72 
98.77 
18 
98.62 
99.11 
99.30 
99.38 
99.66 
99.21 
98.02 
98.56 
98.70 
98.72 
98.76 
19 
98.65 
99.10 
99.30 
99.39 
99.67 
99.20 
98.03 
98.57 
98.70 
98.73 
98.78 
20 
98.66 
99.12 
99.29 
99.61 
99.68 
99.21 
98.05 
98.57 
98.71 
98.73 
98.79 
21 
98.66 
99.15 
99.30 
99.59 
99.67 
99.20 
98.08 
98.58 
98.70 
98.73 
98.79 
22 
98.67 
99.16 
99.30 
99.58 
99.64 
99.14 
98.10 
98.59 
98.69 
98.72 
98.79 
23 
98.67 
99.16 
99.33 
99.57 
99.60 
99.12 
98.11 
98.60 
98.70 
98.71 
98.81 
24 
98.66 
99.18 
99.32 
99.53 
99.58 
99.11 
98.14 
98.63 
98.70 
98.69 
98.82 
25 
98.67 
99.17 
99.33 
99.52 
99.53 
99.10 
98.17 
98.65 
98.70 
98.66 
98.81 
26 
98.71 
99.20 
99.34 
99.50 
99.53 
99.10 
98.18 
98.65 
98.71 
98.64 
98.83 
27 
98.76 
99.19 
99.34 
99.49 
99.53 
99.10 
98.21 
98.54 
98.72 
98.69 
98.84 
28 
98.80 
99.19 
99.36 
99.49 
99.52 
99.09 
98.23 
98.55 
98.73 
98.68 
98.86 
29 
98.82 
99.21 
99.36 
99.51 
99.01 
98.23 
98.56 
98.72 
98.71 
98.86 
30 
98.83 
99.20 
99.35 
99.50 
98.95 
98.23 
98.56 
98.72 
98.70 
98.86 
31 
99.24 
99.38 
99.49 
98.23 
98.74 
98.69 
LOW 
99.24 
99.38 
99.61 
99.68 
99.48 
98.92 
98.65 
98.74 
98.81 
98.86 
HIGH 
98.85 
99.24 
99.35 
99.49 
98.95 
97.99 
98.24 
98.56 
98.64 
98.68 
gi3R 
1- 4(
ta ci 
ew 98 
z< 
usa 99 
cz 
100 
NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 
1985 
1986 
97 
 
 
 
306 
GROUND-WATER LEVELS 
RIO GRANDE DE ARECIBO BASIN 
182737066370900. Local number, 204. 
LOCATION.--Lat 18'27'37", long 66°37'09". 
Owner: Sucesion Marquez. 
• Name: Gilberto Rivera well. 
AQUIFER.--Aymamon Limestone. 
WELL CHARACTERISTICS.--Abandoned unused water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). 
DATUM.--Elevation of land-surface datum is 48.0 ft (14.63 m) above mean sea level. 
Measuring point: Air hole on pump base, 0.50 ft (0.15 m) above land-surface datum. 
REMARKS.--Observation well. Automatic recorder installed on October 16, 1985. 
PERIOD OF RECORD.--October 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 50.00 ft (15.24 m) below land-surface datum, May 14, 
1986; 
lowest water level recorded., 52.28 ft (15.93 m) below land-surface datum, Mar. 5-6, 19-20, 1986. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
51.34 
51.62 
51.94 
52.08 
52.05 
52.05 
51.76 
51.34 
51.96 
52.08 
52.02 
2 
51.39 
51.65 
51.95 
52.13 
52.08 
52.03 
51.74 
51.39 
51.98 
52.11 
51.98 
3 
51.45 
51.69 
51.95 
52.13 
52.10 
52.01 
51.35 
51.39 
51.99 
52.13 
51.99 
4 
51.48 
51.73 
51.91 
52.11 
52.16 
52.02 
51.10 
51.43 
51.99 
52.15 
52.01 
5 
51.43 
51.68 
51.91 
52.14 
52.20 
52.01 
50.96 
51.45 
51.98 
52.11 
51.99 
6 
51.42 
51.66 
51.92 
52.13 
52.19 
52.03 
50.93 
51.52 
51.97 
52.08 
51.98 
7 
51.43 
51.65 
51.91 
52.13 
52.15 
52.04 
50.95 
51.56 
51.98 
52.05 
51.98 
8 
51.41 
51.63 
51.90 
52.12 
52.11 
52.02 
50.97 
51.58 
51.98 
52.03 
52.03 
9 
51.39 
51.63 
51.90 
52.13 
52.14 
51.94 
51.00 
51.60 
51.99 
52.02 
52.08 
10 
51.38 
51.63 
51.89 
52.13 
52.13 
51.91 
51.03 
51.61 
52.00 
52.02 
52.18 
11 
51.36 
51.65 
51.88 
52.11 
52.13 
51.92 
51.04 
51.61 
51.99 
52.04 
52.22 
12 
51.39 
51.67 
51.87 
52.12 
52.11 
51.94 
51.06 
51.64 
51.99 
52.07 
52.21 
13 
51.31 
51.75 
51.87 
52.13 
52.14 
51.95 
51.10 
51.62 
51.99 
52.14 
52.21 
14 
51.32 
51.81 
51.88 
52.13 
52.14 
51.95 
50.94 
51.65 
52.00 
52.14 
52.18 
15 
51.25 
51.83 
51.91 
52.15 
52.16 
51.95 
50.87 
51.65 
51.99 
52.10 
52.16 
16 
51.29 
51.10 
51.86 
51.94 
52.11 
52.18 
51.97 
50.84 
51.66 
52.00 
52.12 
52.10 
17 
51.40 
50.98 
51.86 
51.96 
52.12 
52.15 
51.98 
50.88 
51.69 
52.01 
52.11 
52.03 
18 
51.44 
51.01 
51.87 
51.96 
52.15 
52.18 
51.97 
50.92 
51.69 
52.01 
52.10 
52.01 
19 
51.49 
51.07 
51.85 
51.97 
52.14 
52.20 
51.96 
50.98 
51.69 
52.01 
52.07 
52.02 
20 
51.53 
51.14 
51.88 
51.96 
52.08 
52.22 
51.94 
51.04 
51.70 
52.00 
52.04 
52.02 
21 
51.53 
51.16 
51.89 
51.97 
52.05 
52.21 
51.90 
51.08 
51.70 
51.93 
52.02 
52.04 
22 
51.52 
51.18 
51.87 
51.99 
52.04 
52.16 
51.87 
51.13 
51.66 
51.92 
51.99 
52.06 
23 
51.49 
51.19 
51.86 
51.99 
52.05 
52.09 
51.83 
51.18 
51.63 
51.93 
51.96 
52.10 
24 
51.47 
51.21 
51.86 
51.97 
52.03 
52.07 
51.78 
51.23 
51.95 
51.97 
51.96 
52.14 
25 
51.44 
51.25 
51.85 
51.95 
52.02 
52.05 
51.76 
51.25 
51.95 
51.98 
51.95 
52.12 
26 
51.34 
51.43 
51.87 
51.95 
51.98 
52.07 
51.79 
51.26 
51.93 
51.99 
51.99 
52.19 
27 
51.29 
51.49 
51.90 
51.94 
51.98 
52.07 
51.83 
51.30 
51.93 
52.02 
52.05 
52.24 
28 
51.27 
51.56 
51.91 
51.96 
52.00 
52.04 
51.89 
51.32 
51.94 
52.03 
52.09 
52.25 
29 
51.29 
51.59 
51.95 
51.99 
52.05 
51.77 
51.33 
51.96 
52.04 
52.09 
52.22 
30 
51.31 
51.61 
51.93 
52.00 
52.05 
51.74 
51.33 
51.96 
52.03 
52.05 
52.23 
31 
51.32 
51.92 
52.04 
52.05 
51.34 
52.05 
52.04 
LOW 
51.61 
51.95 
52.04 
52.15 
52.22 
52.05 
51.76 
51.96 
52.05 
52.15 
52.25 
HIGH 
50.98 
51.62 
51.87 
51.98 
52.04 
51.74 
50.84 
51.34 
51.92 
51.95 
51.98 
Br 
50 
1:12 < 
51 
z 
_It
6.110 
52 
53 
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 
1985 
1986 
 
  
 
 
 
 
307 
GROUND-WATER LEVELS 
RIO GRANDE DE MANATI BASIN 
182621066343300. Local number, 135 
LOCATION.--Lat 18°26'21", long 66°34'33". 
Owner: Puerto Rica Land Authority. 
Name: Lederle. 
AQUIFER.--Limestone of Tertiary Age. 
WELL CHARACTERISTICS.--Drilled agricultural water-table well, diameter 24 in (0.61 m), cased 0-30 ft (0-9.1 m), 
diameter 16.62 in (0.42 m), cased to 0-450 ft (0-137.2 m). Depth 550 ft (167.6 m). 
DATUM.--Elevation of land-surface datum is 287 ft (87.48 m) above mean sea level, from topographic map. 
Measuring point: Top of shelter floor, 2.80 ft (0.85 m) above land-surface datum. 
REMARKS.--Recording observation well. 
PERIOD OF RECORD.--November 1979 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 276.8 ft (84.38 m) below land-surface datum, Dec. 16, 
1981; lowest war lev',1 recorded, 283.9 ft (86.55 m) below land-surface datum, May 3, 1984. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
283.46 
282.93 
282.97 
283.31 
283.41 
283.40 
283.42 
283.11 
282.40 
282.84 
283.11 
283.09 
2 
283.49 
282.94 
282.99 
283.30 
283.46 
283.44 
283.41 
283.08 
282.42 
282.87 
283.13 
283.08 
3 
283.52 
282.98 
283.01 
283.29 
283.48 
283.46 
283.40 
282.77 
282.45 
282.89 
283.14 
283.09 
4 
283.54 
283.00 
283.03 
283.26 
283.48 
283.52 
283.39 
281.20 
282.48 
282.90 
283.15 
283.11 
5 
283.55 
282.95 
283.01 
283.25 
283.52 
283.54 
283.39 
280.62 
282.53 
282.90 
283.15 
283.12 
6 
283.53 
282.92 
282.99 
283.27 
283.53 
283.56 
283.40 
280.90 
282.57 
282.90 
283.15 
283.12 
7 
283.38 
282.91 
282.96 
283.29 
283.55 
283.55 
283.42 
281.20 
282.61 
282.91 
283.14 
283.12 
8 
283.03 
282.90 
282.96 
283.32 
283.55 
283.53 
283.40 
281.42 
282.67 
282.93 
283.14 
283.14 
9 
282.88 
282.88 
282.97 
283.33 
283.56 
283.53 
283.32 
281.60 
282.70 
282.95 
283.14 
283.15 
10 
282.84 
282.89 
283.01 
283.34 
283.55 
283.54 
283.24 
281.74 
282.74 
282.98 
283.14 
283.22 
11 
282.84 
282.91 
283.07 
283.33 
283.54 
283.53 
283.23 
281.81 
282.75 
282.98 
283.14 
283.23 
12 
282.83 
282.94 
283.10 
283.30 
283.53 
283.53 
283.23 
281.94 
282.77 
282.98 
283.15 
283.21 
13 
282.81 
282.93 
283.15 
283.28 
283.53 
283.53 
283.25 
281.99 
282.78 
282.96 
283.16 
283.19 
14 
282.81 
282.92 
283.19 
283.26 
283.53 
283.54 
283.24 
281.93 
282.79 
282.96 
283.15 
283.16 
15 
282.85 
282.83 
283.19 
283.27 
283.52 
283.53 
283.26 
281.71 
282.79 
282.94 
283.17 
283.16 
16 
282.89 
282.71 
283.20 
283.28 
283.52 
283.55 
283.28 
281.53 
282.78 
282.93 
283.13 
283.16 
17 
282.96 
282.47 
283.19 
283.30 
283.49 
283.54 
283.30 
281.53 
282.78 
282.93 
283.12 
283.15 
18 
283.00 
282.40 
283.19 
283.31 
283.52 
283.54 
283.30 
281.59 
282.79 
282.92 
283.13 
283.14 
19 
283.01 
282.40 
283.17 
283.32 
283.52 
283.56 
283.28 
281.64 
282.79 
282.96 
283.13 
283.15 
20 
283.03 
282.43 
283.18 
283.32 
283.52 
283.59 
283.25 
281.78 
282.80 
283.01 
283.14 
283.16 
21 
283.03 
282.48 
283.20 
283.34 
283.48 
283.60 
283.22 
281.82 
282.82 
283.04 
283.14 
283.18 
22 
283.02 
282.53 
283.20 
283.37 
283.46 
283.57 
283.18 
281.95 
282.82 
283.07 
283.13 
283.20 
23 
283.01 
282.56 
283.20 
283.38 
283.46 
283.53 
283.15 
282.00 
282.81 
283.11 
283.12 
283.23 
24 
283.00 
282.61 
283.22 
283.38 
283.45 
283.51 
283.13 
282.11 
282.85 
283.11 
283.11 
283.24 
25 
282.99 
282.68 
283.23 
283.37 
283.44 
283.47 
283.12 
282.16 
282.87 
283,11 
283.09 
283.22 
26 
282.95 
282.73 
283.26 
283.36 
283.38 
283.47 
283.13 
282.21 
282.86 
283.10 
283.09 
283.23 
27 
282.92 
282.80 
283.30 
283.36 
283,36 
283.48 
283.15 
282.29 
282.85 
283.13 
283.12 
283.25 
28 
282.87 
282.87 
283.33 
283.36 
283.37 
283.45 
283.17 
282.34 
282.86 
283.12 
283.13 
283.26 
29 
282.88 
282.92 
283.35 
283.38 
283.44 
283.15 
282.37 
282.86 
283.11 
283.13 
283.24 
30 
282.90 
282.95 
283.34 
283.38 
283.44 
283.13 
282.38 
282.85 
283.11 
283.12 
283.25 
31 
282.91 
283.31 
283.39 
283.43 
282.39 
283.10 
283.10 
LOW 
283.55 
283.00 
283.35 
283.39 
283.56 
283.60 
283.42 
283.11 
282.87 
283.13 
283.17 
283.26 
HIGH 
282.81 
282.40 
282.96 
283.25 
283.36 
283.40 
283.12 
280.62 
282.40 
282.84 
283.09 
283.08 
WTR YR 1986 
MEAN 283 
LOW 283.60 
HIGH 280.62 
277
9 
lal 
Oa 
W o 279 
14(.)•/ 
.4 
281 
_11z
1.4.) 
ci 283 
Ix 5 
W-3 285 ONDJFMAMJJ ASONDJ FMAMJJ ASONDJFMAMJJ AS 
1983 1984 
1985 
1986 
 
            
 
308 
GROUND-WATER LEVELS 
RIO GRANDE DE MANATI BASIN 
182757066325600. Local number, 206. 
LOCATION.--Lat 18°27'57", long 66°32'56". 
Owner: P.R. Department of Agriculture. 
Name: Plazuela No. 2. 
AQUIFER.--Aymamon Limestone. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 16 in (0.41 m), cased 16 in (0.41 m) 0-85 ft 
(0-25.9 m), open hole 85-101 ft (25.9-30.8 m). Depth 101 ft (30.8 m). 
DATUM.--Elevation of land-surface datum is about 7.0 ft (2.1 m) above mean sea level, from topographic map. 
Measuring point: Hole on side of casing, 1.30 ft (0.40 m) above land-surface datum. 
REMARKS.--Abandoned observation well. Automatic recorder installed on August 15, 1985. Estimated noon values: 
Jan. 5-8, Feb. 16-19. 
PERIOD OF RECORD.--October 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 3.86 ft (1.18 m) below land-surface datum, May 16. 
1986; 
lowest water level recorded, 5.47 ft (1.67 m) below land-surface datum, Mar. 12, 1986. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
5.20 
4.68 
4.80 
5.08 
5.20 
5.15 
5.24 
4.92 
4.58 
4.92 
4.99 
2 
5.23 
4.68 
4.83 
5.08 
5.20 
5.17 
5.23 
4.89 
4.60 
4.94 
5.02 
3 
5.27 
4.68 
4.84 
5.10 
5.20 
5.24 
5.22 
4.39 
4.61 
4.96 
5.05 
4 
5.31 
4.68 
4.82 
5.11 
5.20 
5.25 
5.22 
4.07 
4.64 
4.97 
5.07 
5 
5.31 
4.68 
4.80 
5.11 
5.20 
5.25 
5.21 
4.01 
4.68 
4.96 
5.09 
6 
5.27 
4.68 
4.77 
5.11 
5.20 
5.25 
5.22 
4.02 
4.71 
4.95 
7 
4.77 
4.68 
4.77 
5.10 
5.20 
5.29 
5.24 
4.06 
4.75 
4.97 
8 
4.55 
4.68 
4.78 
5.10 
5.20 
5.28 
5.22 
4.09 
4.78 
4.97 
9 
4.56 
4.68 
4.80 
5.10 
5.20 
5.30 
5.08 
4.13 
4.80 
4.99 
10 
4.61 
4.68 
4.83 
5.10 
5.20 
5.37 
5.05 
4.15 
4.82 
5.01 
11 
4.64 
4.68 
4.89 
5.09 
5.20 
5.37 
5.06 
4.17 
4.82 
5.00 
12 
4.61 
4.68 
4.95 
5.08 
5.20 
5.37 
5.08 
4.25 
4.85 
4.99 
13 
4.58 
4.68 
4.98 
5.06 
5.20 
5.39 
5.10 
4.21 
4.84 
4.99 
14 
4.57 
4.68 
4.99 
5.08 
5.20 
5.34 
5.10 
3.94 
4.86 
4.99 
15 
4.60 
4.68 
5.01 
5.11 
5.20 
5.34 
5.12 
3.88 
4.85 
4.98 
16 
4.65 
4.68 
4.99 
5.13 
5.21 
5.31 
5.14 
3.89 
4.86 
4.98 
17 
4.72 
4.68 
4.98 
5.13 
5.23 
5.32 
5.15 
3.94 
4.87 
4.99 
18 
4.76 
4.67 
5.00 
5.15 
5.25 
5.38 
5.14 
4.02 
4.87 
4.99 
19 
4.81 
4.67 
5.02 
5.14 
5.27 
5.36 
5.12 
4.09 
4.88 
4.99 
20 
4.84 
4.67 
5.01 
5.16 
5.28 
5.35 
5.10 
4.16 
4.89 
4.99 
21 
4.84 
4.67 
5.01 
5.20 
5.24 
5.34 
4.98 
4.23 
4.91 
4.94 
22 
4.83 
4.67 
5.01 
5.20 
5.24 
5.33 
4.96 
4.29 
4.89 
4.93 
23 
4.81 
4.67 
5.03 
5.20 
5.23 
5.33 
4.96 
4.33 
4.87 
4.92 
24 
4.78 
4.67 
5.07 
5.20 
5.21 
5.34 
4.95 
4.40 
4.90 
4.92 
25 
4.74 
4.67 
5.12 
5.20 
5.28 
5.36 
4.93 
4.45 
4.92 
4.92 
26 
4.65 
4.59 
5.13 
5.20 
5.22 
5.34 
4.96 
4.49 
4.89 
4.93 
27 
4.61 
4.66 
5.13 
5.20 
5.19 
5.42 
4.99 
4.53 
4.90 
4.93 
28 
4.60 
4.72 
5.10 
5.20 
5.20 
5.42 
5.02 
4.56 
4.91 
4.97 
29 
4.62 
4.75 
5.10 
5.20 
---
5.38 
4.94 
4.57 
4.92 
4.98 
30 
4.64 
4.78 
5.10 
5.20 
5.35 
4.91 
4.57 
4.93 
4.99 
31 
4.68 
---
5.10 
5.20 
5.39 
---
4.58 
---
4.97 
LOW 
5.31 
4.78 
5.13 
5.20 
5.28 
5.42 
5.24 
4.92 
4.93 
4.92 
HIGH 
4.55 
4.59 
4.77 
5.06 
5.19 
5.15 
4.91 
3.88 
4.58 
5.01 
3 
4 
P\f` 
5 
6 
OCT NOV DEC JAN FEB MAR APR MAY 
JUN 
JUL AUG SEP 
1985 
1986 
 
    
   
 
          
 
 
309 
GROUND-WATER LEVELS 
RIO GRANDE DE MANATI BASIN 
182710066303700. Local number, 207. 
LOCATION.--Lat 18°27'10", long 66°30'37". 
Owner: P.R. Aqueduct and Sewer Authority. 
Name: Cantito La Luisa. 
AQUIFER.--Aymamon Limestone. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 m), cased 20 in (0.51 m) 0-30 ft 
(0-9.14 m), cased 10 in (0.25 m) 0-126 ft (0-38.4 m), perforated 80-126 ft (24.4-38.4 m). Depth 126 ft (38.4 m). 
DATUM.--Elevation of land-surface datum is about 59.0 ft (18.0 m) above mean sea level, from topographic map. 
Measuring point: Hole on side of casing, 2.00 ft (0.61 m) above land-surface datum. 
REMARKS.--Abandoned observation well. Automatic recorder installed on September 17,1985. 
PERIOD OF RECORD.--October 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 36.38 ft (11.09 m) below land-surface datum, May 15, 
1986; 
lowest wp'.r 
recorded, 
89.83 ft (27.38 m) below land-surface datum, Oct. 5, 1985, 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
88.83 
38.29 
38.04 
38.69 
38.85 
38.92 
39.09 
38.71 
37.84 
38.62 
38.80 
38.77 
2 
89.13 
38.29 
---
38.71 
38.86 
38.96 
39.09 
38.71 
37.89 
38.63 
38.83 
38.76 
3 
89.43 
38.29 
38.73 
38.87 
39.00 
39.09 
37.95 
37.91 
38.65 
38.85 
38.77 
4 
89.63 
38.29 
38.74 
38.87 
39.01 
39.10 
37.78 
37.95 
38.66 
38.86 
38.80 
5 
89.83 
37.85 
38.74 
38.89 
39.04 
39.08 
37.87 
37.99 
38.67 
38.87 
38.81 
6 
89.43 
37.92 
38.75 
38.92 
39.06 
39.08 
37.92 
38.03 
38.69 
38.87 
38.82 
7 
80.93 
37.97 
38.78 
38.95 
39.08 
39.09 
37.94 
38.08 
38.69 
38.87 
38.84 
8 
76.33 
38.00 
38.86 
38.97 
39.08 
39.09 
37.93 
38.11 
38.72 
38.87 
38.85 
9 
77.03 
38.01 
38.88 
38.99 
39.09 
38.94 
37.93 
38.15 
38.75 
38.87 
38.87 
10 
79.43 
38.05 
38.84 
39.00 
39.09 
38.91 
37.95 
38.19 
38.78 
38.87 
38.90 
11 
80.03 
38.08 
---
38.83 
39.00 
39.08 
38.90 
37.95 
38.23 
38.79 
38.88 
38.90 
12 
80.43 
38.12 
38.28 
38.82 
39.01 
39.08 
38.90 
38.00 
38.26 
38.79 
38.89 
38.90 
13 
80.73 
38.02 
38.33 
38.77 
39.02 
39.10 
38.90 
37.81 
38.28 
38.79 
38.89 
38.90 
14 
81.13 
38.00 
38.37 
38.77 
39.03 
39.11 
38.90 
36.61 
38.32 
38.79 
38.88 
38.90 
15 
81.43 
37.79 
38.40 
38.77 
39.04 
39.12 
38.92 
36.41 
38.34 
38.78 
38.87 
38.90 
16 
81.73 
37.43 
38.43 
38.78 
39.03 
39.13 
38.94 
36.55 
38.37 
38.78 
38.87 
38.90 
17 
38.21 
37.23 
38.45 
38.82 
39.01 
39.14 
38.96 
36.68 
38.39 
38.78 
38.87 
38.90 
18 
38.26 
37.24 
38.46 
38.82 
39.02 
39.16 
38.95 
36.82 
38.40 
38.78 
38.87 
38.90 
19 
38.30 
37.29 
38.47 
38.82 
39.03 
39.18 
38.96 
36.96 
38.42 
38.79 
38.88 
38.91 
20 
38.33 
37.35 
38.50 
38.83 
39.01 
39.20 
38.92 
37.08 
38.45 
38.80 
38.88 
38.91 
21 
38.35 
37.42 
38.54 
38.86 
39.00 
39.21 
38.49 
37.21 
38.48 
38.79 
38.89 
38.92 
22 
38.37 
37.49 
38.56 
38.81 
39.01 
39.20 
38.41 
37.29 
38.50 
38.80 
38.89 
38.92 
23 
38.38 
37.55 
38.58 
38.83 
38.99 
39.17 
38.50 
37.38 
38.52 
38.76 
38.88 
38.93 
24 
38.39 
37.61 
38.60 
38.83 
38.97 
39.14 
38.54 
37.47 
38.54 
38.76 
38.86 
38.95 
25 
38.36 
37.68 
38.61 
38.83 
38.96 
39.12 
38.57 
37.55 
38.56 
38.76 
38.80 
38.94 
26 
38.33 
37.80 
38.62 
38.84 
38.94 
39.11 
38.61 
37.63 
38.57 
38.71 
38.77 
38.95 
27 
38.31 
37.85 
38.65 
38.83 
38.93 
39.11 
38.65 
37.70 
38.58 
38.74 
38.81 
38.95 
28 
38.28 
37.91 
38.66 
38.81 
38.92 
39.10 
38.68 
37.75 
38.59 
38.75 
38.82 
38.97 
29 
38.28 
37.96 
38.67 
38.82 
---
39.07 
38.68 
37.81 
38.60 
38.76 
38.81 
38.96 
30 
38.27 
38.00 
38.68 
38.82 
39.07 
38.69 
37.84 
38.61 
38.76 
38.80 
38.96 
31 
38.28 
---
38.68 
38.83 
39.08 
---
37.87 
---
38.77 
38.77 
---
LOW 
89.83 
38.29 
38.88 
39.04 
39.21 
39.10 
38.71 
38.61 
38.80 
38.89 
38.97 
HIGH 
38.21 
37.23 
38.69 
38.85 
38.92 
38.41 
36.41 
37.84 
38.62 
38.77 
38.76 
92 36 
ti4R 
Ugi 37 
La ke; 
z 
38
f ix 
39 
z 
40 
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 
1985 
1986 
      
  
 
 
          
 
 
 
      
310 
GROUND-WATER LEVELS 
RIO GRANDE DE MANATI BASIN 
182534066283000. Local number, 208. 
LOCATION.--Lat 18°25'34", long 66°28'30". 
Owner: P.R. Aqueduct and Sewer Authority, 
Name: Acropolis Manati. 
AQUIFER.--Aguada Limestone. 
WELL CHARACTERISTICS.--Drilled water-table well, diameter 14 in (0.36 m), cased 1e in (0.36 m). Depth 235 ft 
(71.6 m). 
DATUM.--Elevation of land-surface datum is about 254 ft (77.4 m) above mean sea level, from topographic map. 
Measuring point: Hole on side of casing, 0.70 ft (0.21 m) above land-surface datum. 
REMARKS.--Abandoned observation well. Automatic recorder installed on January 8,1986. 
PERIOD OF RECORD.--January 1986 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 228.21 ft (69.56 m) below land-surface datum, May 18, 
1986; 
lowest water level recorded, 238.14 ft (72.58 m) below land-surface datum, Aug. 8,1906. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
236.02 
236.04 
236.15 
236.15 
228.98 
235.48 
237.90 
238.14 
2 
236.02 
236.04 
236.15 
236.15 
229.03 
235.61 
237.97 
238.14 
3 
236.02 
236.04 
236.15 
235.67 
229.10 
235.70 
238.08 
238.14 
4 
236.02 
236.04 
236.15 
234.89 
229.23 
235.84 
238.10 
238.14 
5 
236.02 
236.04 
236.15 
234.45 
229.36 
235.94 
238.13 
238.14 
6 
236.02 
236.04 
236.15 
234.21 
229.55 
236.05 
238.13 
238.14 
7 
236.02 
236.04 
236.15 
234.18 
229.68 
236.11 
238.13 
238.14 
8 
236.02 
236.04 
236.15 
234.18 
229.89 
236.24 
238.14 
238.14 
9 
235.33 
236.02 
236.04 
236.15 
234.20 
230.03 
236.29 
238.14 
238.14 
10 
235.30 
236.02 
236.04 
236.15 
234.23 
230.18 
236.40 
238.14 
238.14 
11 
235.30 
236.02 
236.04 
236.15 
234.16 
230.30 
236.45 
238.14 
238.14 
12 
235.33 
236.02 
236.04 
236.15 
234.13 
230.48 
236.49 
238.14 
238.14 
13 
235.41 
236.02 
236.04 
236.15 
233.79 
230.66 
236.62 
238.14 
238.14 
14 
235.44 
236.02 
236.04 
236.15 
230.91 
230.83 
236.69 
238.14 
238.14 
15 
235.57 
236.02 
236.04 
236.15 
229.82 
230.99 
236.80 
238.14 
238.14 
16 
235.64 
236.02 
236.04 
236.15 
228.86 
231.14 
236.83 
238.14 
238.14 
17 
235.67 
236.02 
236.04 
236.15 
228.33 
231.26 
236.85 
238.14 
238.14 
18 
235.71 
236.02 
236.04 
236.15 
228.23 
231.41 
236.95 
238.14 
238.14 
19 
235.82 
236.02 
236.04 
236.15 
228.24 
231.57 
237.02 
238.14 
238.14 
20 
235.86 
236.02 
236.04 
236.15 
228.35 
231.75 
237.08 
238.14 
238.14 
21 
235.89 
236.02 
236.04 
236.15 
228.46 
231.89 
237.15 
238.14 
238.14 
22 
235.91 
236.02 
236.04 
236.15 
228.61 
232.05 
237.26 
238.14 
238.14 
23 
235.91 
236.02 
236.04 
236.15 
228.69 
232.20 
237.34 
238.14 
238.14 
24 
235.91 
236.02 
236.04 
236.15 
228.84 
232.34 
237.47 
238.14 
238.14 
25 
235.91 
236.02 
236.04 
236.15 
228.90 
234.69 
237.53 
238.14 
238.14 
26 
235.91 
236.02 
236.04 
236.15 
229.04 
234.86 
237.57 
238.14 
238.14 
27 
235.91 
236.04 
236.04 
236.15 
229.16 
235.00 
237.65 
238.14 
238.14 
28 
235.91 
236.04 
236.04 
236.15 
229.25 
235.11 
237.68 
238.14 
238.14 
29 
236.02 
236.04 
236.15 
229.29 
235.24 
237.74 
238.14 
238.14 
30 
236.02 
236.04 
236.15 
229.02 
235.35 
237.81 
238.14 
238.14 
31 
236.02 
236.04 
228.98 
237.87 
238.14 
LOW 
236.04 
236.04 
236.15 
236.15 
235.35 
237.87 
238.14 
238.14 
HIGH 
236.02 
236.04 
236.15 
228.23 
228.98 
235.48 
237.90 
238.14 
9x
La 
220 
co 
0 
225 
Z < 
"".14•• 
230 
W 7) 
235 
240 
A 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1986 
 
 
 
 
 
I 
311 
GROUND-WATER LEVELS 
RIO GRANDE DE MANATI BASIN 
182634066262500. Local number, 209. 
LOCATION.--Lat 18°26'34", long 66°26'25". 
Owner: P.R. Aqueduct and Sewer Authority. 
Name: Coto Norte No. 3. 
AQUIFER.--Aymaaon-Aguada Limestone. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 16 in (0.41 m), cased 16 in (0.41 m) 0-495 ft 
(0-150.9 m), perforated 255-455 ft (77.7-138.7 m). Depth 495 FT (150.9 m). 
DATUM.--Elevation of land-surface datum is about 99.0 ft (30.2 a) above mean sea level, fro 
topographic map. 
Measuring point: Hole on side of casing, 2.30 ft (0.70 m) above land-surface datum. 
REMARKS.--Abandoned observation well. Automatic recorder installed on September 11,1985. 
PERIOD OF RECORD.--October 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 71.50 ft (21.79 m) below land-surface datum, July 23, 
1986; lowest water level recorded, 81.96 ft (24.98 a) below land-surface datum, June 24, 1986. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
81.81 
80.20 
78.88 
81.14 
81.57 
81.48 
81.83 
81.56 
78.59 
80.99 
79.66 
79.80 
2 
81.82 
80.34 
79.05 
81.17 
81.57 
81.50 
81.83 
81.02 
78.83 
---
79.71 
79.83 
3 
81.84 
80.46 
79.21 
81.19 
81.57 
81.54 
81.82 
79.69 
78.99 
79.77 
79.74 
4 
81.86 
80.54 
79.34 
81.21 
81.57 
81.56 
81.81 
78.50 
79.16 
79.79 
79.78 
5 
81.86 
80.18 
79.48 
81.24 
81.57 
81.57 
81.63 
78.09 
79.37 
79.83 
79.81 
6 
81.68 
80.18 
79.58 
81.26 
81.58 
81.59 
81.71 
78.62 
79.56 
79.85 
79.85 
7 
77.93 
80.24 
79.71 
81.29 
81.58 
81.62 
81.71 
78.89 
79.69 
79.86 
79.86 
8 
78.05 
80.36 
79.83 
81.33 
81.58 
81.62 
81.72 
78.99 
79.82 
79.88 
79.89 
9 
78.47 
80.46 
79.93 
81.34 
81.58 
81.64 
81.18 
79.21 
79.95 
79.90 
79.93 
10 
78.83 
80.54 
80.03 
81.32 
81.57 
81.64 
81.38 
79.37 
80.07 
79.91 
79.95 
11 
79.12 
80.64 
80.11 
81.32 
81.56 
81.64 
81.46 
79.22 
80.17 
79.92 
79.96 
12 
79.35 
80.71 
80.19 
81.33 
81.55 
81.64 
81.52 
79.11 
80.29 
79.94 
79.98 
13 
79.58 
79.44 
80.29 
81.33 
81.55 
81.65 
81.59 
77.17 
80.38 
79.95 
80.01 
14 
79.77 
79.25 
80.38 
81.35 
81.55 
81.66 
81.62 
73.93 
80.40 
79.94 
80.03 
15 
79.96 
77.62 
80.44 
81.37 
81.56 
81.65 
81.66 
72.79 
80.48 
79.93 
80.05 
16 
80.12 
75.83 
80.51 
81.39 
81.53 
81.65 
81.65 
72.64 
80.54 
79.94 
80.08 
17 
80.29 
75.29 
80.57 
81.41 
81.52 
81.68 
81.55 
72.80 
80.59 
79.96 
80.09 
18 
80.42 
75.28 
80.63 
81.40 
81.52 
81.70 
81.54 
73.15 
80.65 
79.98 
80.11 
19 
80.47 
75.43 
80.69 
81.42 
81.51 
81.73 
81.60 
73.67 
80.71 
79.99 
80.14 
20 
80.54 
75.69 
80.73 
81.43 
81.51 
81.75 
81.65 
74.25 
80.75 
80.02 
80.17 
21 
80.54 
75.99 
80.78 
81.45 
81.50 
81.77 
81.42 
74.82 
80.80 
80.03 
80.18 
22 
80.63 
76.39 
80.83 
81.48 
81.50 
81.79 
81.45 
75.38 
80.85 
---
80.03 
80.19 
23 
80.69 
76.74 
80.86 
81.49 
81.49 
81.78 
81.19 
75.90 
80.89 
---
80.03 
80.21 
24 
80.68 
77.08 
80.88 
81.52 
81.49 
81.77 
81.33 
76.38 
81.14 
79.51 
80.02 
80.24 
25 
80.42 
77.40 
80.88 
81.53 
81.47 
81.76 
81.41 
76.81 
81.78 
79.53 
79.84 
80.25 
26 
79.76 
77.72 
80.94 
81.53 
81.46 
81.74 
81.48 
77.20 
81.18 
79.56 
79.91 
80.25 
27 
79.89 
77.99 
80.99 
81.52 
81.49 
81.74 
81.51 
77.66 
81.20 
79.57 
79.92 
80.26 
28 
79.41 
78.23 
81.03 
81.54 
81.49 
81.77 
81.50 
77.96 
81.24 
79.60 
79.94 
80.28 
29 
79.61 
78.49 
81.07 
81.57 
81.80 
81.51 
78.23 
81.26 
79.60 
79.93 
80.29 
30 
79.82 
78.73 
81.10 
81.55 
81.82 
81.53 
78.23 
81.29 
79.60 
79.83 
80.31 
31 
80.02 
81.12 
81.56 
81.83 
78.48 
79.64 
79.79 
LOW 
81.86 
80.71 
81.12 
81.57 
81.58 
81.83 
81.83 
81.56 
81.78 
80.03 
80.31 
HIGH 
77.93 
75.28 
78.88 
81.14 
81.46 
81.48 
81.18 
72.64 
78.59 
79.66 
79.74 
65
9 
ta 0 70 
• 
C) 
-
75 
W?) 
80
I 
ex 3 
85 
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 
1985 
1986 
       
 
 
 
 
 
 
      
 
  
  
  
 
   
 
312 
GROUND-WATER LEVELS 
RIO GRANDE DE MANATI BASIN 
182308066260400. Local number, 210. 
LOCATION.--Lat 18'23'08", long 66°26'04". 
Owner: Gelo Martinez. 
Name: Gelo Martinez well. 
AQUIFER.--Lares Limestone. 
WELL CHARACTERISTICS.--Grilled unused water-table well, diameter 8 in (0.20 m), cased 8 in (0.20 m). 
DATUM.--Elevation of land-surface datum is about 574 ft (174.9 m) above mean sea level, from topographic map. 
Measuring point: Hole on side of casing, 2.00 ft (0.61 m) above land-surface datum. 
REMARKS.--Abandoned observation well. Automatic recorder installed on February 27,1986. 
PERIOD OF RECORD.--October 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 40.56 ft (12.36 m) below land-surface datum, May 22, 
1986; lowest water level recorded, 67.67 ft (20.62 m) below land-surface datum, Apr. 6, 1986. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION 
Water 
Water 
Water 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Oct. 31 
49.00 
Nov. 26 
21.40 
Jan. 8 
49.03 
Jan. 29 
49.30 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
62.52 
67.11 
62.68 
44.20 
49.06 
50.04 
54.51 
2 
62.52 
67.29 
62.33 
44.95 
49.05 
50.48 
54.73 
3 
62.87 
67.38 
51.86 
45.78 
49.05 
51.36 
54.76 
4 
63.14 
67.55 
48.97 
46.53 
49.05 
52.42 
53.42 
5 
63.83 
67.63 
48.03 
47.26 
49.04 
53.53 
53.21 
6 
64.23 
67.67 
48.14 
47.80 
49.04 
54.77 
54.08 
7 
64.66 
67.61 
48.44 
48.26 
49.04 
55.92 
55.14 
8 
65.01 
67.51 
48.41 
48.65 
49.05 
57.00 
56.32 
9 
65.27 
67.46 
48.26 
48.91 
49.06 
57.99 
57.60 
10 
65.49 
67.43 
47.97 
49.02 
49.05 
58.80 
58.93 
11 
65.66 
67.43 
47.61 
49.04 
49.06 
59.42 
59.70 
12 
65.77 
66.95 
47.51 
49.04 
49.07 
59.80 
60.42 
13 
65.87 
66.79 
47.24 
49.04 
49.07 
60.01 
60.97 
14 
65.93 
66.69 
46.15 
49.04 
49.07 
59.97 
61.67 
15 
66.02 
66.67 
45.13 
49.03 
49.07 
59.49 
62.10 
16 
53.11 
66.04 
66.67 
43.83 
49.04 
49.06 
58.95 
17 
66.09 
66.71 
42.92 
49.04 
49.05 
58.69 
62.41 
18 
66.13 
66.81 
42.17 
49.04 
49.05 
58.76 
62.51 
19 
66.17 
66.75 
41.49 
49.04 
49.06 
59.21 
62.59 
20 
66.23 
66.68 
41.03 
49.04 
49.04 
59.78 
62.66 
21 
66.28 
66.58 
40.75 
49.04 
49.06 
60.33 
62.74 
22 
66.35 
66.31 
40.60 
49.03 
49.07 
60.97 
62.81 
23 
66.42 
65.96 
40.59 
49.03 
49.10 
61.58 
62.87 
24 
66.46 
63.05 
40.69 
49.04 
49.13 
62.06 
62.97 
25 
66.53 
62.58 
40.86 
49.04 
49.15 
62.09 
63.14 
26 
66.61 
62.48 
41.13 
49.04 
49.20 
61.25 
63.45 
27 
62.23 
66.67 
62.53 
41.49 
49.04 
49.20 
60.45 
63.71 
28 
62.38 
66.77 
62.62 
41.92 
49.04 
49.20 
60.08 
63.90 
29 
66.86 
62.66 
42.39 
49.05 
49.19 
59.91 
64.08 
30 
66.91 
62.71 
42.91 
49.05 
49.25 
58.67 
64.21 
31 
66.91 
43.53 
49.63 
55.87 
LOW 
66.91 
67.67 
62.68 
49.05 
49.63 
62.09 
64.21 
HIGH 
62.52 
62.48 
40.59 
44.20 
49.04 
50.04 
53.21 
20 • 
14(
-
Ls 0 
40 
Z< 
_rt4
La v. 
60 
Gl 
ce z 
dS 
SO 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1986 
 
314 
GROUND-WATER LEVELS 
RIO CIBUCO BASIN 
182615066235300. Local number, 211. 
LOCATION.--Lat 18°26'15", long 66°23'53". 
Owner: P.R. Aqueduct and Sewer Authority. 
Name: Rosario No. 2. 
AQUIFER.--Aguada Limestone. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 14 in (0.36 m) C 200 ft (0-61.0 m), diameter 12 in 
(0.30 m) 200-250 ft (61.0-76.2 m), cased 12 in (0.30 m) 0-250 ft (0-76.2 m), perforated 210-250 ft (64.0-76.2 m), 
diameter 10 in (0.25 m) 250-270 ft (76.2-82.3 m), open hole; concrete sealed 0-200 ft (0-61.0 a). Depth 270 ft 
(82.3 m). 
DATUM.--Elevation of land-surface datum is about 215 ft (65.5 m) above mean sea level, from topographic map. 
Measuring point: Hole on side of casing, 1.15 ft (0.35 m) above land-surface datum. 
REMARKS.--Abandoned observation well. Automatic recorder installed on September 17,1985. 
PERIOD OF RECORD.--October 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 191.29 ft (58.30 m) below land-surface datum, May 16, 
1986; 
lowest water level recorded, 193.10 ft (58.86 m) below land-surface datum, Mar. 21, 1986. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
193.05 
192.23 
191.85 
192.42 
192.82 
192.85 
193.06 
192.90 
191.86 
192.57 
192.69 
192.69 
2 
193.05 
192.24 
191.88 
192.42 
192.84 
192.89 
193.04 
192.88 
191.86 
192.57 
192.69 
192.69 
3 
193.06 
192.27 
191.92 
192.42 
192.85 
192.91 
193.05 
192.80 
191.87 
192.57 
192.69 
192.69 
4 
193.09 
192.30 
191.94 
192.43 
192.86 
192.94 
193.05 
192.67 
191.87 
192.58 
192.69 
192.69 
5 
193.09 
192.30 
191.95 
192.43 
192.89 
192.96 
193.03 
192.52 
191.91 
192.58 
192.69 
192.69 
6 
193.09 
192.30 
191.96 
192.45 
192.91 
192.98 
193.02 
192.49 
191.97 
192.60 
192.69 
192.69 
7 
192.52 
192.30 
191.97 
192.45 
192.93 
192.98 
193.02 
192.49 
192.00 
192.60 
192.72 
192.69 
8 
192.13 
192.30 
191.98 
192.68 
192.93 
192.98 
193.02 
192.49 
192.08 
192.60 
192.73 
192.69 
9 
192.02 
192.30 
192.01 
192.69 
192.94 
192.98 
192.97 
192.45 
192.10 
192.60 
192.73 
192.69 
10 
192.02 
192.31 
192.06 
192.69 
192.96 
192.98 
192.93 
192.41 
192.12 
192.60 
192.73 
192.69 
11 
192.07 
192.32 
192.07 
192.68 
192.96 
192.98 
192.93 
192.40 
192.16 
192.60 
192.73 
192.69 
12 
192.10 
192.33 
192.08 
192.67 
192.96 
192.98 
192.93 
192.40 
192.18 
192.60 
192.74 
192.69 
13 
192.13 
192.33 
192.12 
192.67 
192.99 
192.98 
192.93 
192.24 
192.18 
192.60 
192.74 
192.69 
14 
192.19 
192.19 
192.16 
192.67 
192.99 
192.99 
192.93 
192.21 
192.19 
192.60 
192.74 
192.69 
15 
192.24 
192.08 
192.17 
192.67 
192.99 
192.99 
192.93 191.34 
192.19 
192.60 
192.74 
192.69 
16 
192.29 
191.70 
192.19 
192.67 
192.99 
193.03 
192.93 
191.30 
192.19 
192.60 
192.74 
192.69 
17 
192.40 
191.39 
192.21 
192.68 
192.99 
193.04 
192.99 
191.29 
192.19 
192.60 
192.74 
192.69 
18 
192.41 
191.31 
192.22 
192.68 
192.99 
193.05 
192.99 
191.29 
192.19 
192.60 
192.74 
192.69 
19 
192.41 
191.31 
192.23 
192.69 
193.00 
193.05 
192.99 
191.29 
192.29 
192.60 
192.74 
192.69 
20 
192.41 
191.31 
192.24 
192.69 
193.01 
193.08 
192.98 
191.29 
192.34 
192.60 
192.74 
192.69 
21 
192.41 
191.36 
192.25 
192.71 
193.01 
193.10 
192.96 
191.31 
192.37 
192.60 
192.74 
192.69 
22 
192.41 
191.43 
192.26 
192.73 
193.01 
193.10 
192.92 
191.36 
192.38 
192.60 
192.74 
192.69 
23 
192.42 
191.51 
192.32 
192.75 
193.01 
193.10 
192.90 
191.45 
192.38 
192.69 
192.74 
192.70 
24 
192.42 
191.57 
192.32 
192.75 
193.00 
193.09 
192.89 
191.55 
192.53 
192.69 
192.74 
192.70 
25 
192.42 
191.65 
192.33 
192.75 
192.99 
193.09 
192.89 
191.59 
192.56 
192.69 
192.74 
192.71 
26 
192.36 
191.66 
192.34 
192.75 
192.98 
193.09 
192.89 
191.71 
192.57 
192.69 
192.70 
192.71 
27 
192.31 
191.70 
192.37 
192.75 
192.85 
193.09 
192.90 
191.75 
192.57 
192.69 
192.70 
192.71 
28 
192.26 
191.74 
192.38 
192.76 
192.85 
193.09 
192.90 
191.78 
192.57 
192.69 
192.70 
192.71 
29 
192.22 
191.79 
192.40 
192.77 
193.07 
192.91 
191.84 
192.57 
192.69 
192.70 
192.71 
30 
192.19 
191.82 
192.41 
192.79 
193.07 
192.90 
191.86 
192.57 
192.69 
192.70 
192.71 
31 
192.23 
192.41 
192.80 
193.06 
191.86 
192.69 
192.69 
LOW 
193.09 
192.33 
192.41 
192.80 
193.01 
193.10 
193.06 
192.90 
192.57 
192.69 
192.74 
192.71 
HIGH 
192.02 
191.31 
191.85 
192.42 
192.82 
192.85 
192.89 
191.29 
191.86 
192.57 
192.69 
192.69 
WTR YR 1986 
MEAN 193 
LOW 193 10 
HIGH 191 29 
OCT 
NOV DEC JAN FEB MAR APR 
MAY 
JUN JUL AUG SEP 
1985 
1986 
 
         
 
315 
GROUND-WATER LEVELS 
RIO CIBUCO BASIN 
182515066194000. Local number, 212. 
LOCATION.--Lat 18°25'15", long 66°19'40". 
Owner: U.S. Geological Survey. 
Name: Ponderosa TW-1. 
AQUIFER.--Aguada Limestone-Cibao Formation. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 4 in (0.10 m), cased 4 in (0.10 m) 0-136 ft 
(0-41.1 m), perforated 121-131 ft (36.9-39.9 m); bentonite packed 0.5-121 ft (0.15-36.9 m). 
Depth 136 ft (39.9 m). 
DATUM.--Elevation of land-surface datum is about 98.0 ft (29.9 m) above mean sea level, from topographic map. 
Measuring point: Shelter floor on top of 4 in (0.10 m) casing, 3.00 ft (0.91 m) above land-surface datum. 
REMARKS.--Observation well. Automatic recorder installed on October 17, 1985. 
PERIOD OF RECORD.--October 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 64.00 ft (19.51 m) below land-surface datum, Dec. 1, 
1985; lowest water level recorded, 73.79 ft (22.49 m) below land-surface datum, Sept. 29, 1986. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
66.17 
64.19 
65.37 
66.74 
68.18 
70.31 
72.37 
68.56 
67.99 
68.42 
69.30 
2 
66.17 
64.22 
65.39 
66.78 
67.08 
71.09 
71.06 
68.73 
68.05 
68.49 
69.22 
3 
66.17 
64.27 
65.42 
66.82 
68.53 
71.06 
70.48 
68.84 
68.09 
68.53 
69.16 
4 
66.14 
64.25 
65.46 
66.86 
68.97 
70.84 
70.18 
68.91 
68.12 
68.57 
69.11 
5 
66.09 
64.29 
65.49 
66.90 
69.37 
70.66 
69.90 
68.19 
68.16 
68.60 
69.07 
6 
66.03 
64.32 
65.51 
66.94 
69.71 
70.53 
69.73 
68.91 
68.20 
68.67 
69.05 
7 
66.02 
64.38 
65.53 
66.98 
69.95 
70.42 
69.63 
67.28 
68.21 
68.70 
69.03 
8 
66.02 
64.38 
65.86 
67.02 
70.20 
70.34 
69.49 
67.20 
68.25 
68.74 
69.02 
9 
66.03 
64.40 
65.90 
67.06 
70.27 
70.27 
69.35 
67.17 
68.28 
68.78 
69.01 
10 
66.03 
64.50 
65.95 
67.11 
70.51 
70.21 
69.24 
67.08 
68.32 
68.81 
68.95 
11 
66.03 
64.50 
65.95 
67.14 
70.73 
70.15 
69.05 
66.96 
68.35 
68.79 
68.95 
12 
66.03 
64.50 
65.96 
67.18 
70.90 
70.09 
68.88 
66.91 
68.35 
68.82 
68.99 
13 
65.99 
64.50 
65.99 
67.23 
71.05 
70.06 
68.69 
66.98 
63.22 
68.84 
71.05 
14 
65.94 
64.50 
66.02 
67.28 
71.19 
70.03 
68.20 
67.05 
68.22 
68.84 
71.29 
15 
65.94 
64.50 
66.07 
67.28 
71.32 
69.93 
67.79 
67.10 
68.24 
68.84 
71.44 
16 
65.29 
64.50 
66.10 
67.29 
71.46 
69.89 
67.50 
67.17 
68.25 
68.84 
71.84 
17' 
64.95 
64.87 
66.14 
67.35 
71.57 
69.90 
67.29 
67.00 
68.25 
68.86 
72.13 
18 
66.76 
64.76 
64.85 
66.17 
67.40 
71.72 
70.04 
67.11 
67.24 
68.25 
68.89 
72.38 
19 
66.72 
64.59 
64.87 
66.18 
67.44 
71.83 
71.75 
66.97 
67.29 
68.25 
68.91 
72.59 
20 
66.72 
64.48 
64.94 
66.21 
67.49 
71.87 
71.93 
66.86 
67.32 
68.12 
68.93 
72.77 
21 
66.64 
64.37 
64.99 
66.25 
67.55 
71.87 
72.10 
66.78 
67.38 
68.02 
68.97 
72.92 
22 
66.64 
64.31 
65.05 
66.29 
67.56 
71.97 
72.10 
66.71 
67.42 
68.06 
68.99 
73.05 
23 
66.65 
64.24 
65.11 
66.33 
67.57 
72.08 
72.21 
66.54 
57.48 
68.12 
69.68 
73.19 
24 
66.65 
64.18 
65.11 
66.37 
67.57 
72.17 
72.31 
66.46 
67.52 
68.17 
71.19 
73.46 
25 
66.65 
64.10 
65.14 
66.41 
67.60 
72.18 
72.39 
66.46 
67.70 
68.22 
71.32 
73.39 
26 
66.65 
64.11 
65.18 
66.45 
68.30 
72.26 
72.47 
66.46 
67.76 
68.28 
71.31 
73.47 
27 
66.64 
64.11 
65.22 
66.48 
68.13 
72.35 
72.51 
68.02 
67.82 
68.31 
71.58 
73.55 
28 
66.60 
64.16 
65.22 
66.54 
67.57 
72.42 
72.53 
68.19 
67.86 
68.35 
71.67 
73.42 
29 
66.49 
64.16 
65.28 
66.59 
72.49 
70.82 
68.40 
67.90 
68.40 
70.23 
73.65 
30 
66.22 
64.16 
65.30 
66.53 
71.03 
72.21 
68.42 
67.94 
68.36 
69.61 
73.74 
31 
66.17 
65.33 
66.68 
70.48 
68.63 
68.37 
69.42 
LOW 
66.17 
65.33 
66.68 
68.30 
72.49 
72.53 
72.37 
68.91 
68.40 
71.67 
73.74 
HIGH 
64.10 
64.19 
65.37 
66.74 
67.08 
69.89 
66.46 
66.91 
67.99 
68.42 
68.95 
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 
1985 
1986 
 
316 
GROUND-WATER LEVELS 
RIO CIBUCO BASIN 
182330066185700. Local number, 213. 
LOCATION.--Lat 18°23'30", long 66°18'57". 
Owner: P.R. Aqueduct and Sewer Authority. 
Name: Pampano No. 2. 
AQUIFER.--Rio Indio Limestone-Lares Limestone. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 m), cased 20 in (0.51 m) 0-130 ft 
(0-39.6 m), diameter 14 in (0.36 m), cased 12 in (0.30 m) 0-220 ft (0-67.1 m); open hole 220-330 ft (67.6-
100.6 m). Depth 330 ft (100.6 m). 
DATUM.--Elevation of land-surface datum is about 394 ft (120 m) above mean sea level, from topographic map. 
Measuring point: Hole on side of casing, 2.95 ft (0.90 m) above land-surface datum. 
REMARKS.--Abandoned observation well. Automatic recorder installed on September 16, 1985. 
PERIOD OF RECORD.--October 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 34.40 ft (10.50 m) below land-surface datum, Dec. 6, 
1985; lowest water level recorded, 49.55 ft (15.10 m) below land-surface datum, May 1, 1986. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
47.17 
40.55 
34.62 
37.26 
40.39 
45.09 
47.96 
49.54 
43.13 
43.03 
44.69 
46.42 
2 
47.21 
40.48 
34.62 
37.36 
40.44 
45.19 
47.05 
49.49 
43.01 
43.08 
44.78 
46.09 
3 
47.30 
40.48 
34.61 
37.50 
40.49 
45.35 
47.17 
49.38 
42.90 
43.12 
44.87 
46.19 
4 
47.33 
40.47 
34.59 
37.60 
40.65 
45.47 
47.29 
49.32 
42.75 
43.19 
44.92 
46.19 
5 
47.32 
40.48 
34.57 
37.76 
40.79 
45.58 
47.33 
49.11 
42.80 
43.24 
44.97 
46.25 
6 
47.18 
40.50 
34.55 
37.88 
40.88 
45.64 
47.37 
49.00 
42.82 
43.33 
45.03 
46.25 
7 
46.21 
40.51 
34.60 
37.96 
40.97 
45.79 
47.34 
48.84 
42.76 
43.38 
45.05 
46.31 
8 
45.08 
40.55 
34.67 
38.07 
41.03 
45.96 
47.34 
48.50 
42.76 
43.44 
45.08 
46.34 
9 
44.47 
40.56 
34.72 
38.19 
41.12 
46.10 
47.57 
48.32 
42.82 
43.53 
45.16 
46.39 
10 
44.00 
40.56 
34.79 
38.28 
41.19 
46.17 
47.71 
48.13 
42.88 
43.55 
45.21 
46.08 
11 
43.63 
40.51 
34.84 
38.33 
41.30 
46.18 
47.80 
47.81 
42.93 
43.57 
45.30 
46.19 
12 
43.33 
40.51 
34.91 
38.42 
41.40 
46.29 
47.87 
47.40 
42.95 
43.61 
44.93 
46.27 
13 
43.12 
40.39 
34.97 
38.51 
41.46 
46.39 
47.94 
47.10 
42.91 
43.72 
45.31 
46.40 
14 
42.97 
40.18 
35.03 
38.61 
41.52 
46.46 
48.03 
46.26 
42.92 
43.76 
45.39 
46.45 
15 
42.90 
39.68 
35.12 
38.76 
42.37 
46.53 
48.14 
45.41 
43.01 
43.75 
45.43 
46.53 
16 
42.90 
38.75 
35.22 
38.82 
42.66 
46.61 
48.25 
44.83 
43.00 
43.81 
45.50 
46.55 
17 
42.78 
37.93 
35.32 
38.91 
42.91 
46.72 
48.36 
44.15 
42.88 
43.87 
45.61 
46.56 
18 
42.74 
37.43 
35.42 
38.98 
42.91 
46.82 
48.48 
44.09 
42.81 
43.94 
45.70 
46.62 
19 
42.64 
36.93 
35.53 
39.09 
43.05 
46.94 
48.53 
43.89 
42.80 
43.98 
45.77 
46.68 
20 
42.55 
36.43 
35.72 
39.17 
43.19 
46.90 
48.68 
43.84 
42.79 
44.02 
45.85 
46.72 
21 
42.37 
36.03 
35.86 
39.30 
43.30 
46.95 
48.77 
43.78 
42.75 
44.11 
45.89 
46.73 
22 
42.25 
35.72 
35.99 
39.40 
43.42 
47.08 
48.84 
43.73 
42.73 
44.24 
45.89 
46.74 
23 
42.06 
35.42 
36.11 
39.49 
43.62 
47.22 
48.93 
43.68 
42.76 
44.27 
45.89 
46.76 
24 
41.92 
35.18 
36.29 
39.57 
43.59 
47.32 
49.01 
43.69 
42.69 
44.25 
46.01 
46.74 
25 
41.68 
35.20 
36.40 
39.65 
43.63 
47.41 
49.09 
43.63 
42.72 
44.31 
46.14 
46.88 
26 
41.54 
35.07 
36.59 
39.75 
43.77 
47.51 
49.16 
43.62 
42.78 
44.41 
46.25 
46.91 
27 
41.38 
34.94 
36.69 
39.84 
44.00 
47.58 
49.22 
43.68 
42.81 
44.41 
46.31 
46.91 
28 
41.17 
34.86 
36.80 
39.98 
45.01 
47.68 
49.32 
43.63 
42.84 
44.45 
46.33 
46.98 
29 
40.91 
34.81 
36.88 
40.07 
47.80 
49.35 
43.57 
42.90 
44.53 
46.41 
47.05 
30 
40.75 
34.69 
37.00 
40.14 
47.85 
49.45 
43.43 
42.35 
44.59 
46.46 
47.11 
31 
40.64 
37.15 
40.26 
47.94 
43.29 
44.64 
46.43 
LOW 
47.33 
40.56 
37.15 
40.26 
45.01 
47.94 
49.45 
49.54 
43.13 
44.64 
46.46 
47.11 
HIGH 
40.64 
34.69 
34.55 
37.26 
40.39 
45.09 
47.05 
43.29 
42.69 
43.03 
44.69 
46.08 
25 
35 
45 
55 
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 
1985 
1956 
 
 
 
317 
GROUND-WATER LEVELS 
RIO DE LA PLATA BASIN 
182746066170800. Local number, 214. 
LOCATION.--Lat 18°27'46", long 66°17'08". 
Owner: Dorado Beach Hotel. 
Name: Dorado Beach No. 7. 
AQUIFER.--Aymamon Limestone. 
WELL CHARACTERISTICS.--Drilled water-tabble well, diameter 18 in (0.46 m). Depth 100 ft (30.5 m). 
DATUM.--Elevation of land-surface datum is about 39.0 ft (11.9 m) above mean sea level, from topographic map. 
Measuring point: Hole on side of casing, 1.10 ft (0.34 m) above land-surface datum. 
REMARKS.--Abandoned observation well. Automatic recorder installed on November 7,1985. Water levels affected 
by nearby pumping well. 
PERIOD OF RECORD.-- November 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 18.23 ft (5.56 m) below land-surface datum, Nov. 16, 
1985; lowest water level recorded, 20.12 ft (6.13 m) below land-surface datum, Mar. 19, 1986. 
WATER LEVEL, IN FEE' BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
19.00 
19.45 
19.62 
19.70 
19.83 
19.77 
19.38 
19.78 
19.97 
19.71 
2 
19.07 
19.47 
19.64 
19.76 
19.84 
19.69 
19.42 
19.82 
20.00 
19.65 
3 
19.14 
19.47 
19.61 
19.77 
19.83 
19.67 
19.43 
19.82 
20.02 
19.69 
4 
19.18 
19.46 
19.60 
19.80 
19.85 
19.70 
19.49 
19.83 
20.01 
19.68 
5 
19.14 
19.47 
19.62 
19.85 
19.84 
19.64 
19.54 
19.81 
19.97 
19.62 
6 
19.15 
19.47 
19.61 
19.82 
19.84 
19.68 
19.58 
19.79 
19.89 
19.62 
7 
19.10 
19.12 
19.45 
19.64 
19.79 
19.85 
19.64 
19.62 
19.81 
19.83 
19.64 
8 
19.10 
19,12 
19.36 
19.61 
19.77 
19.84 
19.55 
19.65 
19.80 
19.85 
19.70 
9 
19.10 
19.08 
19.35 
19.64 
19.79 
19.78 
19.53 
19.62 
19.79 
19.85 
19.79 
10 
19.07 
19.08 
19.28 
19.65 
19.79 
19.76 
19.54 
19.62 
19.80 
19.88 
19.86 
11 
19.01 
19.04 
19.26 
19.66 
19.80 
19.76 
19.46 
19.62 
19.78 
19.92 
19.87 
12 
18.99 
19.06 
19.29 
19.68 
19.79 
19.78 
19.45 
19.64 
19.74 
19.94 
19.87 
13 
18.80 
19.13 
19.34 
19.71 
19.84 
19.77 
19.40 
19.60 
19.78 
19.97 
19.91 
14 
18.76 
19.17 
19.37 
19.72 
19.84 
19.78 
18.74 
19.52 
19.79 
19.96 
19.94 
15 
18.54 
19.22 
19.44 
19.75 
19.85 
19.79 
19.02 
19.63 
19.81 
19.96 
19.92 
16 
18.29 
19.29 
19.46 
19.70 
19.88 
19.82 
19.05 
19.66 
19.84 
19.99 
19.85 
17 
18.46 
19.30 
19.45 
19.72 
19.87 
19.83 
19.08 
19.68 
19.84 
19.98 
19.75 
18 
18.6! 
19.32 
19.45 
19.73 
19.91 
19.87 
19.12 
19.69 
19.84 
19.96 
19.73 
19 
18.71 
19.32 
19.44 
19.69 
19.95 
19.85 
19.11 
19.72 
19.85 
19.92 
19.76 
20 
18.75 
19.39 
19.40 
19.63 
19.99 
19.87 
19.16 
19.76 
19.83 
19.89 
19.75 
21 
18.78 
19.36 
19.44 
19.59 
19.94 
19.84 
19.20 
19.75 
19.71 
19.88 
19.77 
22 
18.81 
19.31 
19.45 
19.58 
19.89 
19.83 
19.22 
19.69 
19.72 
19.77 
19.82 
23 
18.80 
19.31 
19.43 
19.60 
19.84 
19.85 
19.23 
19.68 
19.69 
19.73 
19.85 
24 
18.79 
19.31 
19.40 
19.59 
19.83 
19.86 
19.26 
19.70 
19.66 
19.75 
19.89 
25 
18.82 
19.29 
19.37 
19.59 
19.79 
19.84 
19.27 
19.70 
19.67 
19.72 
19.90 
26 
18.84 
19.34 
19.39 
19.55 
19.84 
19.85 
19.27 
19.71 
19.73 
19.79 
19.94 
27 
18.90 
19.37 
19.40 
19.57 
19.84 
19.85 
19.31 
19.71 
19.80 
19.86 
19.98 
28 
18.93 
19.37 
19.47 
19.62 
19.79 
19.85 
19.31 
19.73 
19.82 
19.92 
19.99 
29 
18.97 
19.41 
19.52 
19.83 
19.83 
19.33 
19.77 
19.86 
19.91 
19.95 
30 
18.97 
19.40 
19.52 
19.85 
19.79 
19.32 
19.79 
19.89 
19.79 
19.90 
31 
19.42 
19.58 
19.86 
19.36 
19.94 
19.73 
LOW 
19.42 
19.58 
19.75 
19.99 
19.87 
19.77 
19.79 
19.94 
20.02 
19.99 
HIGH 
19.00 
19.26 
19.55 
19.70 
19.76 
18.74 
19.38 
19.66 
19.72 
19.62 
18 
18.5
ict4 
1- 4c
tao 19 
0 
Z 4( 
19.5 
LaJ 
20 
cr -1 20.5
W 
NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 
1985 
1986 
 
 
  
 
 
318 
GROUND-WATER LEVELS 
RIO DE LA PLATA BASIN 
182548066171200. Local number, 215. 
LOCATION.--Lat 18'25'48", long 66'17'12". 
Owner: P.R. Aqueduct and Sewer Authority. 
Name: Maguayo No. 5. 
AQUIFER.--Aguada Limestone-Cibao Formation. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 m) 0-95 Pt (0-29.0 m), cased 20 in 
(0.51 m) 0-60 ft (0-18.3 m), diameter 16 in (0.41 m) 95-145 ft (29.0-44.2 m), cased 16 in (.0.41 m) 0-145 ft 
(0-44.2 m), perforated 65-145 ft (19.8-44.2 m). Depth 145 ft (44.2 m). 
DATUM.--Elevation of land-surface datum is about 66 ft (20.1 m) above mean sea level, from topographic map. 
Measuring point: Hole on side of casing, 1.60 ft (0.49 m) above land-surface datum. 
REMARKS.--Abandoned observation well. Automatic recorder installed on August 13, 1985. 
PERIOD OF RECORD.--October 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 40.89 ft (12.46 m) below land-surface datum, Nov. 20, 
1985; 
lowest water level recorded, 44.25 ft (13.49 m) below land-surface datum, Oct. 1, 1985. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
44.25 
41.91 
41.58 
42.51 
42.97 
43.49 
44.07 
44.03 
42.14 
43.27 
43.62 
43.47 
2 
44.22 
41.95 
41.64 
42.53 
42.99 
43.50 
44.00 
43.97 
47.20 
43.29 
43.63 
43.44 
3 
44.22 
42.00 
41.69 
42.55 
43.01 
43.53 
44.02 
43.93 
42.24 
43.32 
43.65 
43.42 
4 
44.22 
42.02 
41.73 
42.56 
43.03 
43.56 
44.02 
43.92 
42.29 
43.35 
43.67 
43.42 
5 
44.20 
42.03 
41.77 
42.58 
43.04 
43.58 
44.02 
43.88 
42.36 
43.37 
43.68 
43.44 
6 
44.13 
42.05 
41.79 
42.60 
43.05 
43.61 
43.98 
43.83 
42.43 
43.39 
43.69 
43.46 
7 
43.62 
42.06 
41.83 
42.62 
43.07 
43.63 
43.98 
43.79 
42.47 
43.40 
43.71 
43.46 
8 
43.62 
42.09 
41.88 
42.64 
43.09 
43.66 
43.99 
43.72 
42.53 
43.42 
43.72 
43.48 
9 
42.07 
42.14 
41.91 
42.66 
43.10 
43.69 
43.97 
43.67 
42.57 
43.44 
43.74 
43.49 
10 
41.58 
42.17 
41.94 
42.63 
43.12 
43.71 
43.95 
43.60 
42.62 
43.47 
43.74 
43.51 
11 
41.29 
42.20 
41.95 
42.62 
43.14 
43.72 
43.95 
43.51 
42.67 
43.48 
43.75 
43.54 
12 
41.12 
42.22 
41.99 
42.62 
43.17 
43.74 
43.95 
43.40 
42.72 
43.44 
43.75 
43.56 
13 
41.07 
42.13 
42.01 
42.63 
43.19 
43.76 
43.96 
43.27 
42.75 
43.43 
43.73 
43.59 
14 
41.09 
42.04 
42.03 
42.64 
43.21 
43.77 
43.98 
42.70 
42.77 
43.44 
43.71 
43.63 
15 
41.15 
41.86 
42.06 
42.67 
43.23 
43.78 
44.00 
42.29 
42.80 
43.44 
43.71 
43.66 
16 
41.26 
41.49 
t2.09 
42.68 
43.25 
43.79 
44.01 
41.89 
42.83 
43.43 
43.71 
43.68 
17 
41.36 
41.24 
42.11 
42.69 
43.28 
43.81 
44.02 
41.55 
42.85 
43.42 
43.72 
43.70 
18 
41.46 
41.02 
42.13 
42.70 
43.30 
43.84 
44.03 
41.38 
42.88 
43.43 
43.74 
43.72 
19 
41.53 
40.92 
42.14 
42.71 
43.32 
43.86 
44.04 
41.30 
42.90 
43.44 
43.75 
43.75 
20 
41.61 
40.90 
42.18 
42.72 
43.33 
43.88 
44.06 
41.29 
42.94 
43.45 
43.77 
43.77 
21 
41.68 
40.92 
42.22 
42.74 
43.35 
43.90 
44.06 
41.33 
42.98 
43.47 
43.78 
43.79 
22 
41.74 
40.96 
42.24 
42.77 
43.36 
43.92 
44.06 
41.39 
43.01 
43.48 
43.79 
43.82 
23 
41.83 
41.02 
42.27 
42.79 
43.40 
43.94 
44.07 
41.49 
43.04 
43.49 
43.80 
43.83 
24 
41.87 
41.07 
42.29 
42.80 
43.41 
43.97 
44.07 
41.59 
43.08 
43.51 
43.81 
43.86 
25 
41.90 
41.22 
42.31 
42.81 
43.43 
43.98 
44.08 
41.66 
43.11 
43.51 
43.80 
43.89 
26 
41.88 
41.29 
42.33 
42.84 
43.44 
43.99 
44.08 
41.73 
43.15 
43.53 
43.79 
43.90 
27 
41.86 
41.35 
42.37 
42.85 
43.46 
44.00 
44.09 
41.82 
43.17 
43.54 
43.78 
43.91 
28 
41.85 
41.42 
42.41 
42.87 
43.48 
44.01 
44.10 
41.88 
43.19 
43.56 
43.78 
43.93 
29 
41.86 
41.48 
42.43 
42.90 
44.02 
44.11 
41.95 
43.22 
43.57 
43.73 
43.94 
30 
41.87 
41.53 
42.46 
42.91 
44.03 
44.08 
42.02 
43.25 
43.59 
43.61 
43.96 
31 
41.88 
42.49 
42.94 
44.05 
42.07 
43.60 
43.52 
LOW 
44.25 
42.22 
42.49 
42.94 
43.48 
44.05 
44.11 
44.03 
43.25 
43.60 
43.81 
43.96 
HIGH 
41.07 
40.90 
41.58 
42.51 
42.97 
43.49 
43.95 
41.29 
42.14 
43.27 
43.52 
43.42 
WTR YR 1986 
MEAN 43.0 
LOW 44.25 
HIGH 40.90 
40 
42 
44 
46 
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 
1985 
1986 
   
319 
GROUND-WATER LEVELS 
RIO DE LA PLATA BASIN 
182530066135400. Local number, 216. 
LOCATION.--Lat 18°25'30", long 66°13'54". 
Owner: P.R. Aqueduct and Sewer Authority. 
Name: Pozo Navy-Campanillas. 
AQUIFER.--Aguada Limestone. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 16 in (0.41 m) 0-106 ft (0-32.3 m), cased 16 in 
(0.41 m) 0-20 ft (0-6.10 m), cased 12 in (0.30 m) 0-106 ft (0-32.3 m), perforated 20-106 ft (6.10-32.3 m), 
diameter 10 in (10.25 m) 106-140 ft (32.3-42.7 m), cased 10 in (0.25 m) 106-140 ft (32.3-42.7 m), perforated 
106-140 ft (32.3-42.7 m). Depth 140 ft (42.7 m). 
DATUM.--Elevation of land-surface datum is about 13.0 ft (3.96 m) above mean sea level, from topographic map. 
Measuring point: Hole on side of casing, 1.80 ft (0.55 m) above land-surface datum. 
REMARKS.--Abandoned observation well. Automatic recorder installed on August 13, 1985. 
PERIOD OF RECORD.--October 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 10.17 ft (3.10 m) below land-surface datum, Nov. 21, 
1985; lowest water level recorded, 14.72 ft (4.49 m) below land-surface datum, Apr. 28, 1986. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
14.35 
11.70 
11.34 
12.42 
13.22 
13.97 
14.54 
14.51 
11.68 
12.93 
13.12 
13.29 
2 
13.46 
11.79 
11.38 
12.46 
13.24 
14.00 
14.54 
14.11 
11.70 
12.96 
13.15 
13.28 
3 
14.02 
11.88 
11.43 
12.47 
13.23 
14.02 
14.54 
13.96 
11.72 
12.98 
13.20 
13.32 
4 
14.13 
11.92 
11.46 
12.47 
13.25 
14.06 
14.51 
13.99 
11.76 
13.02 
13.22 
13.37 
5 
14.02 
11.54 
10.92 
12.50 
13.26 
14.11 
14.47 
13.95 
11.81 
13.03 
13.25 
13.40 
6 
13.90 
11.40 
11.43 
12.53 
13.25 
14.13 
14.42 
13.88 
11.86 
13.01 
13.26 
13.42 
7 
11.28 
11.40 
11.48 
12.55 
13.33 
14.16 
14.42 
13.71 
11.93 
13.03 
13.28 
13.45 
8 
11.23 
11.41 
11.53 
1 2.60 
13.37 
14.20 
14.44 
13.53 
11.92 
13.06 
13.30 
13.48 
9 
11.37 
11.42 
11.55 
12.54 
13.40 
14.24 
14.38 
13.46 
12.07 
13.08 
13.33 
13.54 
10 
11.48 
11.91 
11.58 
12.53 
13.43 
14.24 
14.34 
13.38 
12.23 
13.10 
13.35 
13.62 
11 
11.56 
11.96 
11.62 
12.52 
13.46 
14.25 
14.35 
13.21 
12.27 
13.09 
13.36 
13.65 
12 
11.62 
11.98 
11.67 
12.54 
13.50 
14.27 
14.36 
13.15 
".34 
'2.86 
13.38 
13.65 
13 
11.65 
11.86 
11.73 
12.57 
13.53 
14.30 
14.38 
12.81 
...37 
.2.85 
13.31 
13.70 
14 
11.67 
11.77 
11.79 
12.60 
13.57 
14.32 
14.40 
11.97 
12.37 
12.86 
13.25 
13.73 
15 
11.73 
11.42 
11.84 
12.65 
13.61 
14.36 
14.45 
11.89 
12.40 
12.80 
13.13 
13.73 
16 
11.80 
10.96 
11.72 
12.67 
13.64 
14.39 
14.48 
12.00 
12.29 
12.76 
13.09 
13.77 
17 
11.85 
10.82 
11.66 
12.68 
13.66 
14.36 
14.51 
12.05 
12.39 
12.73 
13.25 
13.77 
18 
11.63 
10.85 
11.84 
12.65 
13.69 
14.40 
14.54 
12.03 
12.46 
12.74 
13.42 
13.85 
19 
11.78 
10.87 
11.92 
12.72 
13.70 
14.44 
14.57 
12.03 
12.53 
12.76 
13.42 
13.85 
20 
11.78 
10.89 
11.97 
12.74 
13.72 
14.43 
14.58 
11.93 
12.58 
12.76 
13.44 
13.91 
21 
11.77 
10.74 
11.97 
12.80 
13.74 
14.48 
14.53 
11.87 
12.64 
12.78 
13.49 
13.90 
22 
11.83 
10.85 
11.81 
12.85 
13.78 
14.50 
14.53 
11.87 
12.66 
12.84 
13.50 
13.89 
23 
11.86 
10.92 
11.87 
12.89 
13.81 
14.57 
14.55 
11.92 
12.70 
12.87 
13.49 
13.89 
24 
11.76 
10.98 
12.05 
12.92 
13.83 
14.55 
14.57 
11.96 
12.75 
12.88 
13.51 
14.00 
25 
11.75 
11.00 
12.12 
12.93 
13.85 
14.51 
14.65 
12.01 
12.79 
12.92 
13.52 
13.98 
26 
11.78 
11.09 
12.20 
12.97 
13.87 
14.51 
14.65 
12.04 
12.83 
12.96 
13.47 
13.94 
27 
11.66 
11.15 
12.27 
12.99 
13.91 
14.52 
14.67 
12.05 
12.88 
12.99 
13.61 
14.02 
28 
11.67 
11.23 
12.30 
13.04 
13.94 
14.50 
14.67 
11.85 
12.87 
13.04 
13.58 
14.02 
29 
11.73 
11.27 
12.34 
13.10 
14.51 
14.69 
11.83 
12.89 
13.08 
13.25 
13.97 
30 
11.78 
11.30 
12.38 
13.14 
14.53 
14.61 
11.71 
12.91 
13.11 
13.30 
14.00 
31 
11.59 
12.42 
13.17 
14.54 
11.70 
13.12 
13.28 
LOW 
14.35 
11.98 
12.42 
13.17 
13.94 
14.57 
14.69 
14.51 
12.91 
13.12 
13.61 
14.02 
HIGH 
11.23 
10.74 
10.92 
12.42 
13.22 
13.97 
14.34 
11.70 
11.68 
12.73 
13.09 
13.28 
WTR YR 1986 
MEAN 12.9 
LOW 14.69 
HIGH 10.74 
OCT NOV DEC 
JAN 
FEB MAR APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1985 
1986 
 
 
 
320 
GROUND-WATER LEVELS 
RIO DE LA PLATA BASIN 
182655066142400. Local number, 217. 
LOCATION.--Lat 18°26'55", long 66°14'24". 
Owner: U.S. Geological Survey. 
Name: Monserrate TW-2. 
AQUIFER.-Alluvial Deposits. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 4 in (0.10 m), cased 4 in (0.10 m) 0-80 ft 
(0-24.4 m), perforated 10-80 ft (3.05-24.4 m). Depth 80 ft (24.4 m). 
DATUM.--Elevation of land-surface datum is about 3.30 ft (1.00 m) above mean sea level, from topographic map. 
Measuring point: Top of shelter floor, 3.50 ft (1.07 m) above land-surface datum. 
REMARKS.--Observation well. Automatic recorder installed on August 20, 1985. 
PERIOD OF RECORD.--November 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 0.02 ft (0.006 m) below land-surface datum, May 16, 
1986; 
lowest water level recorded, 1.92 ft (0.58 m) below land-surface datum, Apr. 12, 1986. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
.72 
1.11 
1.26 
1.51 
1.75 
1.62 
.77 
1.26 
1.42 
1.24 
2 
.77 
1.09 
1.28 
1.54 
1.75 
1.32 
.77 
1.30 
1.46 
1.23 
3 
-
.82 
1.09 
1.29 
1.57 
1.74 
1.25 
.78 
1.29 
1.49 
1.29 
4 
.83 
1.04 
1.25 
1.61 
1.73 
1.29 
.83 
1.31 
1.49 
1.32 
5 
.76 
1.04 
1.27 
1.65 
1.70 
1.32 
.84 
1.32 
1.47 
1.33 
6 
.72 
1.06 
1.29 
1.68 
1.67 
1.36 
.90 
1.31 
1.44 
1.33 
7 
.71 
.96 
1.33 
1.68 
1.68 
1.30 
.96 
1.30 
1.44 
1.34 
8 
.73 
1.01 
1.33 
1.66 
1.68 
1.13 
1.01 
1.32 
1.44 
1.39 
9 
.73 
.95 
1.36 
1.69 
1.66 
1.09 
1.09 
1.32 
1.45 
1.45 
10 
.74 
.90 
1.37 
1.68 
1.57 
1.07 
1.07 
1.35 
1.46 
1.52 
11 
.75 
.87 
1.36 
1.68 
1.59 
.95 
.90 
1.33 
1.49 
1.52 
12 
.77 
.92 
1.37 
1.67 
1.60 
.92 
.96 
1.19 
1.49 
1.51 
13 
.85 
.95 
1.38 
1.70 
1.61 
---
.95 
1.18 
1.45 
1.52 
14 
.91 
.96 
1.40 
1.70 
1.62 
1.01 
1.22 
1.41 
1.53 
15 
.93 
1.00 
1.42 
1.68 
1.66 
1.01 
1.20 
1.37 
1.55 
16 
.96 
1.01 
1.42 
1.73 
1.69 
---
1.03 
1.21 
1.42 
1.54 
17 
.89 
1.01 
1.42 
1.73 
1.72 
.15 
1.07 
1.21 
1.44 
1.51 
18 
.85 
1.01 
1.45 
1.75 
1.75 
.30 
1.04 
1.23 
1.46 
1.53 
19 
.85 
1.04 
1.45 
1.78 
1.74 
.40 
1.09 
1.26 
1.47 
1.55 
20 
.89 
1.06 
1.44 
1.82 
1.74 
.47 
1.11 
1.27 
1.50 
1.56 
21 
.91 
1.13 
1.43 
1.84 
1.70 
.46 
1.13 
1.23 
1.54 
1.58 
22 
.89 
1.18 
1.45 
1.83 
1.67 
.52 
1.1 7 
1.25 
1.54 
1.58 
23 
.88 
1.17 
1.47 
1.78 
1.69 
.56 
1.18 
1.26 
1.47 
1.59 
24 
.93 
1.17 
1.47 
1.81 
1.70 
.58 
1.16 
1.23 
1.49 
1.70 
25 
.95 
1.14 
1.45 
1.74 
1.74 
.68 
1.21 
1.25 
1.44 
1.68 
26 
.53 
1.03 
1.16 
1.43 
1.72 
1.77 
.73 
1.19 
1.30 
1.48 
1.70 
27 
.59 
1.05 
1.16 
1.43 
1.73 
1.78 
.77 
1.22 
1.34 
1.50 
1.69 
28 
.65 
1.05 
1.21 
1.50 
1.68 
1.79 
.80 
1.23 
1.36 
1.49 
1.70 
29 
.69 
1.08 
1.23 
---
1.69 
1.80 
.81 
1.26 
1.40 
1.40 
1.67 
30 
.69 
1.08 
1.23 
1.71 
1.71 
.84 
1.28 
1.41 
1.28 
1.67 
31 
---
1.10 
1.23 
1.76 
---
.81 
---
1.41 
1.25 
---
LOW 
1.10 
1.23 
1.50 
1.84 
1.80 
1.28 
1.41 
1.54 
1.70 
HIGH 
.71 
.87 
1.25 
1.51 
1.57 
.77 
1.18 
1.25 
1.23 
0.5 
1.5 
2 
NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 
19$5 
1986 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
321 
GROUND-WATER LEVELS 
RIO HONDO TO RIO PUERTO NUEVO BASINS 
182623066111000. Local number, 218. 
LOCATION.--Lat 18°26'23", long 66°11'10". 
Owner: P.R. Aqueduct and Sewer Authority. 
Name: Levittown No. 7. 
AQUIFER.--Alluvial deposits-Aymamon Limestone. 
WELL CHARACTERISTICS.--Drilled water-table well. 
DATUM.--Elevation of land surface datum is about 10.0 ft (3.05 m) above mean sea level, from topographic map. 
Measuring point: Hole on pump base, 1.55 ft (0.47 m) above land-surface datum. 
REMARKS.--Abandoned observation well. Automatic recorder installed August 13, 1985. 
PERIOD OF RECORD.--October 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 6.52 ft (199 m) below land-surface datum, Oct. 9, 
1985; lowest water level recorded, 9.77 ft (2.98 m) below land-surface datum, Mar. 23, 1986. 
WATER 'LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
8.22 
7.23 
8.00 
7.75 
8.63 
8.95 
8.86 
9.36 
7.39 
7.58 
1.77 
7.90 
2 
8.13 
7.27 
8.03 
7.75 
8.65 
8.99 
8.84 
8.90 
7.37 
7.60 
7.86 
7.86 
3 
8.17 
7.34 
8.07 
7.76 
8.62 
8.98 
8.85 
8.63 
7.35 
7.60 
7.93 
7.87 
4 
8.20 
7.37 
8.09 
7.75 
8.63 
8.99 
8.76 
8.74 
7.35 
7.62 
7.97 
7.86 
5 
8.22 
7.32 
8.09 
7.76 
8.64 
9.03 
8.66 
8.81 
7.37 
7.71 
7.87 
7.87 
6 
8.11 
7.33 
8.09 
7.76 
8.65 
9.04 
8.62 
8.79 
8.02 
7.73 
7.82 
7.85 
7 
7.08 
7.32 
8.11 
7.77 
8.66 
9.04 
8.61 
8.69 
8.34 
7.75 
7.82 
7.86 
8 
6.66 
7.31 
8.12 
7.75 
8.69 
9.05 
8.61 
8.65 
8.37 
7.68 
7.81 
7.90 
9 
6.60 
7.50 
8.11 
7.75 
8.72 
9.07 
9.17 
7.84 
8.26 
7.66 
7.87 
8.00 
10 
6.62 
7.30 
8.12 
7.73 
8.71 
8.94 
8.59 
7.73 
8.33 
7.68 
7.96 
8.00 
11 
6.68 
7.27 
8.14 
7.96 
8.74 
9.07 
8.56 
7.65 
8.33 
7.66 
8.00 
8.00 
12 
6.70 
7.28 
8.16 
7.76 
8.76 
9.07 
8.59 
7.59 
8.37 
7.64 
7.94 
8.00 
13 
6.74 
7.24 
8.17 
7.76 
8.77 
9.11 
8.59 
7.46 
8.38 
7.69 
7.91 
8.02 
14 
6.78 
7.22 
8.16 
7.77 
8.79 
9.11 
8.58 
7.03 
8.43 
7.72 
7.87 
8.02 
15 
6.85 
7.14 
8.17 
7.82 
8.83 
9.13 
8.60 
6.89 
8.46 
7.62 
7.84 
8.03 
16 
6.95 
7.05 
8.17 
7.82 
8.83 
9.17 
8.63 
6.84 
8.50 
7.61 
8.24 
8.04 
17 
7.04 
7.32 
7.93 
7.83 
8.84 
9.15 
8.63 
6.86 
8.53 
7.58 
8.18 
8.01 
18 
7.14 
7.34 
7.80 
7.83 
8.84 
9.15 
8.67 
6.89 
8.58 
7.58 
8.27 
8.01 
19 
7.19 
7.48 
7.74 
8.23 
8.83 
9.14 
8.68 
6.91 
7.86 
7.63 
8.51 
8.02 
20 
7.21 
7.55 
7.72 
8.29 
8.83 
9.20 
8.66 
6.96 
7.82 
7.72 
8.86 
8.03 
21 
7.22 
7.59 
7.94 
8.33 
8.81 
9.20 
8.61 
7.01 
7.80 
7.73 
8.99 
8.04 
22 
7.26 
7.16 
7.69 
8.38 
8.83 
9.19 
8.58 
7.10 
7.77 
7.64 
8.42 
8.06 
23 
7.26 
7.60 
7.66 
8.41 
8.85 
9.67 
8.58 
7.95 
7.78 
7.62 
8.95 
8.09 
24 
7.24 
7.65 
7.65 
8.42 
8.85 
9.70 
8.58 
8.12 
7.67 
7.58 
9.04 
8.09 
25 
7.23 
7.69 
7.64 
8.44 
8.84 
9.05 
9.16 
8.22 
7.59 
7.59 
8.25 
8.11 
26 
7.22 
7.74 
7.67 
8.47 
8.82 
9.00 
9.27 
8.33 
7.58 
7.69 
8.17 
8.14 
27 
7.20 
7.82 
7.70 
8.48 
8.87 
8.99 
9.30 
8.36 
7.56 
7.78 
8.14 
8.15 
28 
7.18 
7.90 
1.69 
8.54 
8.90 
8.94 
9.30 
8.43 
7.58 
7.82 
8.09 
8.15 
29 
7.21 
7.93 
7.72 
8.56 
---
8.95 
9.32 
7.63 
7.59 
7.75 
8.03 
8.14 
30 
7.23 
7.96 
7.72 
8.58 
8.94 
9.37 
7.49 
7.61 
7.76 
7.98 
8.14 
31 
7.22 
---
7.73 
8.57 
8.89 
---
7.48 
---
7.75 
7.93 
---
LOW 
8.22 
7.96 
8.17 
8.58 
8.90 
9.70 
9.37 
9.36 
8.58 
7.82 
9.04 
8.15 
HIGH 
6.60 
7.05 
7.64 
7.73 
8.62 
8.89 
8.56 
6.84 
7.35 
7.58 
7.77 
7.85 
WTR YR 1986 
MEAN 8.07 
LOW 9.70 
HIGH 6.60 
SEP
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG 
1985 
1p86 
  
 
322 
GROUND-WATER LEVELS 
RIO HONDO TO RIO PUERTO NUEVO BASINS 
182441066082600. Local number, 219. 
LOCATION.--Lat 18°24'41", long 66°08'26". 
Owner: Department of Defense. 
Name: Ft. Buchanan No. 1, Buchanan Park well. 
AQUIFER.--Cibao Formation. 
WELL CHARACTERISTICS.--Drilled water-table well, diameter 10 in (0.25 m), cased 10 in (0.25 m) 0-270 ft (0-82.3 m), 
perforated 46-685 ft (14.0-20.7 m), 88-120 ft (26.8-36.6 m), 160-191 ft (48.8-58.2 m), 240-270 ft (73.2-82.3 m). 
Depth 270 ft (82.3 m). 
DATUM.--Elevation of land-surface datum is about 66.0 ft (20.1 m) above mean sea level, from topographic map. 
Measuring point: Hole on side of casing, 0.75 ft (0.23 m) above land-surface datum. Prior June 30, 1986, top 
of shelter floor, 3.59 ft (1.09 m) above land-surface datum. 
REMARKS.--Abandoned observation well. Automatic recorder installed on December 20, 1985. Estimated noon value: 
June 30. 
PERIOD OF RECORD.--December 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 38.10 ft (11.61 m) below land-surface datum, June 16, 
1986; lowest water level recorded, 42.95 ft (13.09 m) below land-surface datum, Apr. 4, 1986. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
40.52 
41.13 
41.86 
42.88 
41.97 
39.04 
38.78 
39.07 
39.92 
2 
40.54 
41.09 
41.87 
42.89 
41.75 
39.02 
38.83 
39.10 
39.97 
3 
40.57 
41.06 
41.91 
42.94 
41.49 
39.00 
38.87 
39.13 
40.10 
4 
40.58 
41.07 
41.98 
42.95 
41.31 
39.01 
38.90 
39.15 
40.21 
5 
40.61 
41.09 
42.00 
42.83 
41.21 
39.03 
38.93 
39.21 
40.28 
6 
40.65 
41.09 
42.03 
42.82 
41.16 
39.06 
38.93 
39.25 
40.37 
7 
40.65 
41.11 
42.06 
42.76 
41.01 
39.09 
38.87 
39.28 
40.45 
8 
40.72 
41.11 
42.12 
42.74 
40.82 
38.82 
38.86 
39.32 
40.52 
9 
40.71 
41.12 
42.16 
42.60 
40.71 
38.57 
38.87 
39.40 
40.60 
10 
40.67 
41.13 
42.16 
42.48 
40.59 
38.44 
38.88 
39.45 
40.68 
11 
40.59 
41.17 
42.15 
42.39 
40.45 
38.30 
38.87 
39.50 
40.70 
12 
40.57 
41.21 
42.18 
42.35 
40.35 
38.23 
38.80 
39.56 
40.73 
13 
40.57 
41.24 
42.21 
42.28 
40.16 
38.17 
38.75 
39.55 
40.80 
14 
40.59 
41.29 
42.25 
42.25 
39.87 
38.14 
38.71 
39.50 
40.89 
15 
40.66 
41.33 
42.27 
42.28 
39.70 
38.12 
38.66 
39.45 
40.96 
16 
40.71 
41.36 
42.27 
42.33 
39.52 
38.12 
38.63 
39.42 
41.07 
17 
40.75 
41.39 
42.30 
42.36 
39.46 
38.14 
38.63 
39.42 
41.13 
18 
40.76 
41.40 
42.34 
42.38 
39.42 
38.16 
38.67 
39.45 
41.23 
19 
40.78 
41.40 
42.38 
42.38 
39.41 
38.20 
38.70 
39.49 
41.31 
20 
40.81 
41.45 
42.40 
42.40 
39.42 
38.25 
38.71 
39.54 
41.41 
21 
40.21 
40.87 
41.49 
42.42 
42.40 
39.42 
38.27 
38.78 
39.59 
41.47 
22 
40.21 
40.90 
41.54 
42.53 
42.37 
39.41 
38.27 
38.88 
39.61 
41.50 
23 
40.22 
40.92 
41.59 
42.65 
42.31 
39.45 
38.32 
38.92 
39.61 
41.51 
24 
40.28 
40.93 
41.64 
42.76 
42.26 
39.48 
38.37 
38.93 
39.65 
41.56 
25 
40.35 
40.97 
41.64 
42.83 
42.25 
39.47 
38.41 
38.94 
39.74 
41.67 
26 
40.39 
41.00 
41.69 
42.86 
42.26 
39.47 
38.45 
39.00 
39.83 
41.78 
27 
40.41 
41.05 
41.78 
42.86 
42.26 
39.48 
38.51 
39.01 
39.93 
41.79 
28 
40.40 
41.11 
41.84 
42.85 
42.28 
39.50 
38.55 
39.03 
40.01 
41.79 
29 
40.41 
41.13 
42.87 
42.25 
39.41 
38.59 
39.09 
40.06 
41.80 
30 
40.44 
41.16 
42.86 
42.15 
39.23 
38.68 
39.11 
40.02 
41.81 
31 
40.51 
41.14 
42.88 
39.12 
39.08 
39.94 
LOW 
41.16 
41.84 
42.88 
42.95 
41.97 
39.09 
39.11 
40.06 
41.81 
HIGH 
40.52 
41.06 
41.86 
42.15 
39.12 
38.12 
38.63 
39.07 
39.92 
36 
geR 
Z 38 
PNgl 
40 
t4 42 
OS
< 44 
DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 
1985 1988 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
       
323 
GROUND-WATER LEVELS 
RIO HONDO AND RIO PUERTO NUEVO BASINS 
182413066044000. Local number, 220. 
LOCATION.--Lat 18°24'13", long 66°04'40". 
Owner: P.R. Aqueduct and Sewer Authority. 
Name: Parque San Luis Rey-Americo Miranda 
AQUIFER.--Surficial Deposits-Cibao Formation. 
WELL CHARACTERISTICS.--Drilled unused artesian well, diameter 10 in (0.25 m), cased 8 in (0.20 m) 0-166 ft (0-
50.6 m), perforated 39-166 ft (11.9-50.6 m). Depth 166 ft (50.6 m). 
DATUM.--Elevation of land-surface datum is about 16.4 ft (5.0 m) above mean sea level, from topographic map. 
Measuring point:* Top of shelter floor, 3.00 ft (0.91 m) above land-surface datum. 
REMARKS.--Abandoned observation well. Automatic recorder installed on Feb. 6, 1986. 
PERIOD OF RECORD.--February 1986 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, +2.99 ft (0.91 m) above land-surface datum, Feb. 6, 
May 8-9, 1986: lowest water level recorded, 0.77 ft (0.23 m) below land-surface datum, Sept. 20-21, 1986. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
+2.59 
+2.21 
+2.49 
+ .49 
+ .01 
.08 
.30 
2 
+2.57 
+2.19 
+2.72 
+ .45 
.00 
.10 
.31 
3 
+2.57 
+2.19 
+2.84 
+ .42 
.01 
.12 
.36 
4 
+2.56 
+2.19 
+2.92 
+ .39 
.03 
.14 
.38 
5 
+2.55 
+2.44 
+2.93 
+ .33 
.05 
.18 
.40 
6 
+2.97 
+2.53 
+2.48 
+2.92 
+ .19 
+ .01 
.21 
.40 
7 
+2.97 
+2.51 
+2.54 
+2.92 
+ .15 
.04 
.24 
.45 
8 
+2.96 
+2.49 
+2.56 
+2.96 
+ .38 
.05 
.26 
.47 
9 
+2.92 
+2.47 
+2.62 
+2.97 
+ .55 
.07 
.31 
.49 
10 
+2.90 
+2.47 
+2.75 
---
+ .60 
.12 
.35 
.52 
11 
+2.87 
+2.49 
+2.82 
+ .68 
.12 
.36 
.53 
12 
+2.84 
+2.49 
+2.83 
+ .69 
.09 
.39 
.53 
13 
+2.83 
+2.48 
+2.83 
+ .67 
.10 
.34 
.59 
14 
+2.81 
+2.49 
+2.82 
+ .64 
.11 
.28 
.63 
15 
+2.80 
+2.50 
+2.79 
+ .61 
.04 
.20 
.65 
16 
+2.77 
+2.50 
+2.76 
---
+ .51 
.02 
.19 
.67 
17 
+2.78 
+2.50 
+2.73 
+ .98 
+ .52 
+ .02 
.20 
.68 
18 
+2.77 
+2.49 
+2.71 
+ .92 
+ .47 
+ .03 
.23 
.70 
19 
+2.77 
+2.48 
+2.69 
+ .88 
+ .42 
+ .02 
.21 
.72 
20 
+2.76 
+2.43 
+2.66 
+ .80 
+ .37 
.00 
.32 
.75 
21 
+2.76 
+2.40 
+2.16 
+ .73 
+ .34 
.03 
.36 
.76 
22 
+2.73 
+2.36 
+2.30 
+ .69 
+ .32 
.08 
.38 
.74 
23 
+2.69 
+2.33 
+2.37 
+ .64 
+ .29 
.12 
.40 
.63 
24 
+2.68 
+2.31 
+2.39 
+ .59 
+ .24 
.07 
.42 
.61 
25 
+2.69 
+2.32 
+2.39 
+ .55 
+ .20 
.09 
.47 
.59 
26 
+2.67 
+2.29 
+2.36 
+ .50 
+ .15 
.12 
.51 
.60 
27 
+2.64 
+2.28 
+2,33 
+ .48 
+ .12 
.14 
.56 
.59 
28 
+2.63 
+2.25 
+2.34 
+ .43 
+ .09 
.23 
.51 
.60 
29 
---
+2.25 
+2.34 
+ .49 
+ .05 
.25 
.41 
.57 
30 
+2.22 
+2.37 
+ .50 
+ .03 
.24 
.34 
.57 
31 
+2.22 
---
+ .49 
---
.10 
.31 
---
LOW 
+2.22 
+2.16 
+ .03 
.25 
.56 
.76 
HIGH 
+2.59 
+2.83 
+ .69 
+ .03 
.08 
.30 
O 
+4 
W 
CD 
Lo +2 
w ia, 
za 0 
- g 
>in
La I 
2
- J 
C IA 4C 
aJ 4 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1986 
+ Above land-surface datum. 
 
 
 
324 
GROUND-WATER LEVELS 
RIO HONDO TO RIO PUERTO NUEVO BASINS 
182436066031200. Local number, 221. 
LOCATION.--Lat 18°24'36", long 66°03'12". 
Owner: P.R. Highway Authority 
Name: Hyde Park TW-10. 
AQUIFER.--Surficial Deposits-Cibao Formation. 
WELL CHARACTERISTICS.--Drilled water-table well, diameter 4 in (0.10 m), cased 4 in (0.10 m) 1-107 ft (0-32.36 m), 
perforated 19-107 ft (5.79-32.6 m). Depth 107 ft (32.6 m). 
DATUM.--Elevation of land-surface datum is about 82.0 ft (25.0 m) above mean sea level, from topographic map. 
Measuring point: Hole on side of casing, 0.70 ft (0.21 m) above land-surface datum. Prior July 28, 1986, top 
of shelter floor, 3.14 ft (0.96 m) above land-surface datum. 
REMARKS.--Observation well. Automatic recorder installed on Dec. 17, 1985. 
PERIOD OF RECORD.--December 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 1.92 ft (0.58 m) below land-surface datum, May 14, 
1986; 
lowest water level recorded, 15.59 ft (4.75 m) below land-surface datum, Apr. 5, 1986. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
7.53 
9.21 
11.93 
15.26 
7.74 
6.29 
8.40 
7.61 
8.01 
2 
7.60 
9.31 
12.05 
15.37 
8.05 
6.49 
8.45 
7.77 
8.17 
3 
7.65 
9.41 
12.17 
15.47 
5.43 
6.69 
8.42 
7.94 
8.33 
4 
7.56 
9.24 
12.29 
15.53 
5.96 
6.85 
8.53 
8.07 
8.46 
5 
7.66 
9.11 
12.42 
14.80 
6.50 
7.06 
8.59 
8.14 
8.52 
6 
7.72 
9.31 
12.55 
13.04 
5.75 
7.19 
8.64 
8.24 
8.48 
7 
7.76 
9.50 
12.69 
12.89 
5.22 
7.23 
8.09 
8.34 
8.54 
8 
7.83 
9.63 
12.83 
12.89 
4.36 
7.13 
8.22 
8.42 
8.71 
9 
7.49 
9.74 
12.95 
12.35 
4.79 
6.80 
8.34 
8.54 
8.82 
10 
7.16 
9.86 
13.07 
11.26 
5.22 
6.93 
8.49 
8.68 
8.96 
11 
7.36 
9.97 
13.16 
11.42 
3.58 
6.00 
8.55 
8.78 
9.10 
12 
7.50 
10.03 
13.28 
11.58 
4.10 
6.25 
8.43 
8.75 
9.29 
13 
7.71 
10.10 
13.41 
11.71 
2.67 
6.42 
8.51 
8.26 
9.46 
14 
7.83 
10.24 
13.50 
11.85 
2.32 
6.60 
8.51 
7.98 
9.61 
15 
7.95 
10.36 
13.50 
12.03 
3.25 
6.76 
8.52 
7.65 
9.72 
16 
---
8.02 
10.47 
13.59 
12.17 
4.07 
6.94 
8.50 
7.88 
9.85 
17 
6.73 
8.08 
10.57 
13.70 
12.31 
4.59 
7.11 
8.38 
8.09 
10.00 
18 
6.76 
7.94 
10.66 
13.82 
12.44 
5.05 
7.23 
8.47 
8.25 
10.17 
19 
6.80 
8.07 
10.77 
13.94 
12.57 
5.25 
7.34 
8.62 
8.38 
10.11 
20 
6.78 
8.18 
10.88 
14.04 
12.72 
5.67 
7.41 
8.75 
8.53 
10.23 
21 
6.85 
8.28 
11.00 
14.16 
11.33 
5.89 
7.50 
8.85 
8.67 
10.35 
22 
6.84 
8.39 
11.11 
14.28 
9.68 
6.06 
7.57 
8.96 
8.79 
10.27 
23 
6.91 
8.46 
11.24 
14.39 
9.82 
6.29 
7.68 
9.02 
8.93 
9.88 
24 
7.00 
8.52 
11.36 
14.51 
10.02 
6.45 
7.76 
9.10 
9.03 
10.03 
25 
7.07 
8.57 
11.46 
14.63 
10.25 
6.58 
7.84 
8.62 
9.14 
10.17 
26 
7.13 
8.67 
11.57 
14.70 
10.45 
6.71 
8.00 
8.76 
9.26 
10.32 
27 
7.21 
8.77 
11.70 
14.80 
10.59 
5.42 
8.08 
8.93 
9.39 
10.39 
28 
7.27 
8.89 
11.82 
14.90 
10.64 
5.55 
8.11 
9.22 
9.37 
10.52 
29 
7.26 
8.98 
---
14.94 
10.64 
5.85 
8.21 
9.33 
7.90 
10.10 
30 
7.22 
9.08 
15.04 
10.35 
6.08 
8.33 
8.11 
8.21 
10.19 
31 
7.44 
9.11 
15.16 
---
6.22 
--
7.35 
8.34 
---
LOW 
9.11 
11.82 
15.16 
15.53 
8.05 
8.33 
9.33 
9.39 
10.52 
HIGH 
7.16 
9.11 
11.93 
9.68 
2.32 
6.00 
7.35 
7.61 
8.01 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1985 
1986 
            
 
       
325 
GROUND-WATER LEVELS 
RIO GRANDE DE LOIZA BASIN 
182515065594100. Local number, 222. 
LOCATION.--Lat 18°25'15', long 65°59'41". 
Owner: U.S. Geological Survey. 
Name: Campo Rico TW-1. 
AQUIFER.--Surficial Deposits. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 4 in (0.10 m). Depth 100 ft (30.5 m). 
DATUM.--Elevation of land-surface datum is about 10.0 ft (3.05 m) above mean sea level, from topographic map. 
Measuring point: Hole on side of casing, 0.80 ft (0.24 m) above land-surface datum. Prior July 28, 1986, 
top of shelter floor, 3.10 ft. (0.94 m) above land-surface datum. 
REMARKS.--Observation well. Automatic recorder installed on February 5, 1986. 
PERIOD OF RECORD.--February 1986 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 4.42 ft (1.35 m) below land-surface datum, Aug. 31, 
1986; lowest water level recorded, 7.42 ft (2.26 m) below land-surface datum, Feb. 9, 1986. 
WATER LFVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
6.19 
4.98 
4.82 
4.92 
6.10 
6.11 
4.73 
2 
6.21 
4.95 
4.82 
6.01 
6.19 
6.09 
4.65 
3 
6.21 
4.92 
5.70 
4.98 
6.18 
6.07 
4.72 
4 
6.18 
4.92 
5.77 
6.10 
6.12 
6.09 
4.70 
5 
6.22 
5.80 
5.78 
6.14 
6.01 
4.92 
4.63 
6 
6.30 
6.11 
4.91 
5.79 
6.14 
4.99 
4.84 
4.63 
7 
6.29 
4.97 
4.95 
5.80 
6.14 
6.08 
5.80 
4.69 
8 
6.16 
4.91 
4.93 
5.78 
6.13 
6.00 
4.81 
4.85 
9 
6.14 
4.92 
4.88 
5.78 
6.14 
6.00 
4.82 
6.04 
10 
6.14 
4.96 
5.92 
5.77 
6.09 
6.05 
4.85 
6.25 
11 
-
6.17 
6.07 
4.98 
5.77 
6.07 
4.98 
6.04 
6.25 
12 
6.29 
6.01 
6.00 
5.82 
6.09 
4.97 
6.15 
6.18 
13 
6.33 
6.17 
4.96 
5.74 
6.00 
6.06 
6.25 
6.11 
14 
6.31 
6.16 
4.98 
5.70 
6.09 
6.14 
6.21 
6.07 
15 
6.33 
6.16 
4.97 
5.82 
6.08 
6.16 
6.10 
4.96 
16 
6.24 
6.18 
4.96 
5.78 
6.19 
6.29 
6.07 
4.84 
17 
6.30 
6.16 
4.97 
5.81 
6.20 
6.32 
4.94 
4.65 
18 
6.42 
6.20 
6.04 
4.85 
6.23 
6.32 
4.90 
4.63 
19 
6.31 
6.20 
4.93 
4.90 
6.22 
6.28 
5.81 
4.65 
20 
6.12 
6.23 
5.90 
4.99 
6.26 
6.14 
4.79 
4.62 
21 
5.93 
6.17 
5.81 
6.06 
6.18 
4.92 
4.78 
4.72 
22 
4.97 
4.98 
5.84 
4.99 
6.07 
4.90 
5.70 
4.86 
23 
6.04 
4.88 
4.87 
4.94 
6.02 
4.86 
4.69 
6.03 
24 
6.06 
5.86 
4.87 
4.91 
6.08 
5.77 
5.71 
6.09 
25 
6.12 
4.83 
4.85 
4.89 
6.00 
4.78 
5.80 
6.09 
26 
4.97 
4.96 
4.89 
4.89 
4.96 
4.89 
4.96 
6.13 
27 
6.10 
6.00 
4.89 
4.90 
6.04 
4.98 
6.10 
6.15 
28 
6.11 
4.90 
4.93 
4.92 
6.07 
6.08 
6.09 
6.10 
29 
6.04 
4.89 
4.91 
6.12 
6.13 
6.03 
6.06 
30 
6.08 
4.88 
4.88 
6.14 
6.10 
4.90 
6.04 
31 
6.10 
4.93 
6.11 
4.82 
LOW 
6.23 
6.04 
6.06 
6.26 
6.32 
6.25 
6.25 
HIGH 
4.83 
4.85 
4.82 
4.92 
4.78 
4.69 
4.62 
Isn 
SEP
JUL 
AUG
FEB 
MAR 
APR 
MAY 
JUN 
1986 
 
 
 
 
 
   
326 
GROUND-WATER LEVELS 
RIO HUMACAO TO RIO SECO BASINS 
175858066100200. Local number, 6. 
LOCATION.--Lat 17°58'58", long 66°10'02". 
Owner: Doctor Bruno. 
Name: Juana 5. 
AQUIFER.--Alluvium of Quaternary Age. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 16 in (0.41 m) Depth 173 ft (52.74 m) reported, 
110 ft (33.54 m) measured. 
DATUM.--Elevation of land-surface datum is about 127 ft (38.7 m) above mean sea level, from topographic map. 
Measuring point: Top of shelter floor, 3.00 ft (0.91 m) above land-surface datum. After Aug. 7, 1981, top of 
16 in (0.41 m) casing, 1.55 ft (0.47 m) above land-surface datum. 
REMARKS.--Recording observation well. 
PERIOD OF RECORD.--November 1960 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 26.20 ft (7.99 m) below land-surface datum, Dec. 10, 
1979; 
lowest water level recorded, 65.95 ft (20.10 m) below land-surface datum, June 2, 1958. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
52.02 
38.96 
30.38 
30.68 
33.82 
37.70 
41.77 
43.59 
44.22 
44.38 
46.59 
48.71 
2 
52.03 
38.31 
30.32 
30.77 
33.95 
37.84 
41.89 
43.67 
44.29 
44.49 
46.61 
48.71 
3 
52.05 
37.67 
30.26 
30.85 
34.09 
37.98 
41.99 
43.77 
44.33 
44.59 
46.57 
48.69 
4 
52.06 
37.06 
30.21 
30.96 
34.23 
38.13 
42.07 
43.87 
44.37 
44.67 
46.61 
48.67 
5 
52.07 
36.47 
30.16 
31.05 
34.36 
38.10 
42.12 
43.98 
44.43 
44.73 
46.76 
48.67 
6 
52.04 
35.92 
30.10 
31.11 
34.48 
38.33 
42.19 
44.09 
44.47 
44.79 
46.90 
48.69 
7 
51.88 
35.39 
30.05 
31.19 
34.63 
38.47 
42.27 
44.23 
44.52 
44.85 
46.97 
48.73 
8 
51.26 
34.91 
30.02 
31.30 
34.80 
38.61 
42.37 
44.31 
44.57 
44.90 
47.06 
48.76 
9 
50.68 
34.47 
30.00 
31.41 
34.98 
38.70 
42.46 
44.40 
44.62 
44.96 
47.10 
48.81 
10 
49.89 
34.03 
29.98 
31.50 
35.15 
38.89 
42.49 
44.50 
44.64 
45.02 
47.12 
48.87 
11 
48.96 
33.64 
29.95 
31.60 
35.30 
39.05 
42.57 
44.60 
44.59 
45.07 
47.16 
48.94 
12 
48.13 
33.27 
29.95 
31.71 
35.46 
39.22 
42.62 
44.67 
44.54 
45.'2 
47.25 
49.01 
13 
47.35 
32.98 
29.92 
31.81 
35.62 
39.35 
42.63 
44.74 
44.47 
45.17 
47.36 
49.05 
14 
46.64 
32.70 
29.90 
31.91 
35.76 
39.55 
42.67 
44.78 
44.43 
45.22 
47.41 
49.10 
15 
45.98 
32.44 
29.90 
32.00 
35.87 
39.66 
42.73 
44.74 
44.38 
45.28 
47.45 
49.16 
16 
45.39 
32.22 
29.90 
32.12 
36.00 
39.79 
42.80 
44.66 
44.32 
45.33 
47.47 
49.23 
17 
44.80 
32.04 
29.93 
32.20 
36.13 
39.90 
42.86 
44.58 
44.24 
45.42 
47.51 
49.28 
18 
44.27 
31.88 
29.92 
32.30 
36.28 
40.05 
42.92 
44.52 
44.10 
45.52 
47.55 
49.35 
19 
43.75 
31.71 
29.88 
32.43 
36.43 
40.18 
42.96 
44.45 
43.94 
45.62 
47.60 
49.38 
20 
43.29 
31.54 
29.84 
32.57 
36.56 
40.29 
43.01 
44.39 
43.85 
45.74 
47.68 
49.39 
21 
42.84 
31.40 
29.86 
32.68 
36.71 
40.42 
43.09 
44.32 
43.84 
45.87 
47.79 
49.42 
22 
42.44 
31.28 
29.92 
32.81 
36.84 
40.53 
43.15 
44.27 
43.87 
46.00 
47.89 
49.41 
23 
42.06 
31.16 
29.98 
32.91 
36.95 
40.65 
43.20 
44.20 
43.91 
46.13 
47.98 
49.31 
24 
41.70 
31.03 
30.03 
33.03 
37.02 
40.79 
43.24 
44.16 
43.93 
46.22 
48.09 
49.36 
25 
41.39 
30.91 
30.06 
33.12 
37.12 
40.97 
43.28 
44.09 
43.95 
46.27 
48.22 
49.44 
26 
41.11 
30.82 
30.15 
33.17 
37.25 
41.10 
43.33 
44.03 
43.98 
46.30 
48.34 
49.49 
27 
40.85 
30.71 
30.26 
33.24 
37.41 
41.22 
43.39 
43.97 
44.02 
46.33 
48.45 
49.49 
28 
40.58 
30.63 
30.33 
33.32 
37.56 
41.34 
43.46 
43.94 
44,10 
46.37 
48.56 
49.56 
29 
40.32 
30.55 
30.40 
33.41 
41.45 
43.49 
43.98 
44.19 
46.40 
48.64 
49.65 
30 
40.05 
30.45 
30.50 
33.55 
41.55 
43.53 
44.06 
44.28 
46.44 
48.67 
49.74 
31 
39.58 
30.59 
33.67 
41.67 
44.14 
46.51 
48.69 
LOW 
52.07 
38.96 
30.59 
33.67 
37.56 
41.67 
43.53 
44.78 
44.64 
46.51 
48.69 
49.74 
HIGH 
39.58 
30.45 
29.84 
30.68 
33.82 
37.70 
41.77 
43.59 
43.84 
44.38 
46.57 
48.67 
WTR YR 1986 
MEAN 40.9 
LOW 52.07 
HIGH 29.84 
9 2 
22 
Leas aj 
4 
o 32 
w o
W 
th. 
42 
52 
62 
AS
ONDJ FMAA4JJ ASONDJ FMAMJJ ASONDJ FMAMJJ 
1986
1983 1984 
1985 
 
  
 
 
327 
GROUND-WATER LEVELS 
RIO GUAYANES BASIN 
180415065513900. Local number, 96. 
LOCATION.--Lat 18°04 1 15", long 65°51'39". 
Owner: P.R. Aqueduct and Sewer Authority. 
Name: USGS TW-2 or Yabucoa 7. 
AQUIFER.--Alluvium of Quaternary Age. 
WELL CHARACTERISTICS.--Drilled observation water-table well, diameter 16 in (0.41 m), cased 0-10 ft (0-3.05 m), 
diameter 6 in (0.16 m), cased about 0-183 ft (0-55.79 m), perforated 56-81 ft (17.07-24.70 m), 102-123 ft 
(31.10-37.50 m), 144-181 ft (43.90-55.18 m). Depth 181 ft (55.18 m). 
DATUM.--Elevation of land-surface datum is about 25 ft (7.62 m) above mean sea level, from topographic map. 
Measuring point: Top of shelter floor, 4.00 ft (1.22 m) above land-surface. 
REMARKS.--Observation recording well. 
PERIOD OF RECORD.--Ap-il 25, 1978 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 13.39 ft (4.08 m) below land-surface datum, Nov. 18, 
1985; lowest water level recorded, 28.29 ft (8.62 m) below land-surface datum, Sept. 20, 1980. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
16.80 
13.91 
16.27 
17.98 
19.55 
19.63 
19.10 
16.72 
17.05 
17.80 
16.80 
2 
16.59 
14.08 
16.32 
17.90 
19.66 
19.61 
18.97 
16.72 
17.15 
17.75 
16.80 
3 
16.42 
14.28 
16.38 
17.85 
19.74 
19.56 
18.88 
16.72 
17.24 
17.71 
16.80 
4 
16.29 
14.46 
16.40 
17.82 
19.82 
19.52 
18.77 
16.72 
17.30 
17.72 
16.80 
5 
16.17 
14.59 
16.43 
17.79 
19.88 
19.46 
18.65 
16.72 
17.40 
17.76 
16.80 
6 
15.84 
14.69 
16.46 
17.78 
19.91 
19.37 
18.57 
16.72 
17.45 
17.85 
16.80 
7 
15.43 
14.79 
16.48 
17.78 
19.89 
19.29 
18.48 
16.72 
17.45 
17.93 
16.81 
8 
15.10 
14.90 
16.52 
17.79 
19.87 
19.21 
18.42 
16.72 
17.46 
17.96 
16.82 
9 
14.73 
15.04 
16.59 
17.84 
19.85 
19.14 
18.36 
16.71 
17.46 
17.97 
16.90 
10 
14.42 
15.19 
16.69 
17.92 
19.85 
19.04 
18.30 
16.71 
17.46 
17.86 
16.98 
11 
14.21 
15.30 
16.82 
18.05 
19.86 
18.96 
18.18 
16.71 
17.46 
17.71 
17.09 
12 
14.05 
15.39 
16.96 
18.14 
19.89 
18.94 
18.00 
16.71 
17.46 
17.46 
17.18 
13 
13.89 
15.48 
17.13 
18.23 
19.92 
18.92 
17.81 
16.71 
17.46 
17.25 
17.23 
14 
13.80 
15.57 
17.28 
18.33 
19.97 
18.89 
17.61 
16.71 
17.46 
17.05 
17.27 
15 
13.81 
15.66 
17.42 
18.43 
20.00 
18.90 
17.44 
16.71 
17.46 
16.84 
17.29 
16 
13.88 
15.75 
17.54 
18.52 
20.01 
18.95 
17.30 
16.71 
17.46 
16.80 
17.31 
17 
14.01 
15.81 
17.62 
18.63 
20.01 
19.01 
17.22 
16.71 
17.46 
16.80 
17.36 
18 
14.14 
---
15.90 
17.69 
18.69 
20:01 
19.10 
17.21 
16.71 
17.46 
16.80 
17.41 
19 
14.25 
13.40 
15.98 
17.76 
18.76 
19.97 
19.23 
17.12 
16.71 
17.74 
16.80 
17.47 
20 
14.37 
13.42 
16.00 
17.87 
18.83 
19.89 
19.22 
17.02 
16.71 
17.95 
16.80 
17.52 
21 
14.57 
13.43 
16.01 
17.95 
18.89 
19.84 
19.22 
16.93 
16.71 
18.17 
16.80 
17.54 
22 
14.81 
13.47 
16.02 
18.00 
18.95 
19.84 
19.24 
16.85 
16.71 
18.33 
16.80 
17.54 
23 
14.95 
13.50 
16.01 
18.09 
18.99 
19.79 
19.29 
16.81 
16.71 
18.45 
16.80 
17.53 
24 
14.94 
13.50 
16.03 
18.17 
19.05 
19.75 
19.36 
16.72 
16.71 
18.45 
16.80 
17.54 
25 
14.85 
13.53 
16.08 
18.20 
19.14 
19.71 
19.38 
16.72 
16.71 
18.36 
16.80 
17.55 
26 
14.70 
13.57 
16.14 
18.22 
19.24 
19.69 
19.40 
16.72 
16.71 
18.22 
16.80 
17.61 
27 
14.57 
13.61 
16.20 
18.22 
19.33 
19.68 
19.41 
16.72 
16.71 
18.15 
16.80 
17.69 
28 
13.62 
16.23 
18.23 
19.43 
19.70 
19.39 
16.72 
16.78 
18.13 
16.80 
17.74 
29 
13.68 
16.22 
18.22 
19.70 
19.34 
16.72 
16.88 
18.06 
16.80 
17.80 
30 
13.78 
16.19 
18.14 
19.64 
19.23 
16.72 
16.96 
17.97 
16.80 
17.86 
31 
16.21 
18.07 
19.62 
16.72 
17.92 
16.80 
LOW 
16.23 
18.23 
19.43 
20.01 
19.63 
19.10 
16.96 
18.45 
17.97 
17.86 
HIGH 
13.91 
16.27 
17.78 
19.55 
18.89 
16.72 
16.71 
17.05 
16.80 
16.80 
S 
10 
ei4 1-4 14 
4.140 
Zs(
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18 
>
La V) 
22 
rez 
26 
ONDJ FIAAMJJ ASONDJ FMAMJJ ASONDJ FMAMJJ AS 
1983 1984 
1985 
1986 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
GROUND-WATER LEVELS 
RIO SALINAS TO RIO JACAGUAS BASINS 
175829066232200. Local number, 87. 
LOCATION.--Lat 17°58'29", long 66°23'22". 
Owner: Francisco Alomar. 
Name: Alomar 1. 
AQUIFER.--Alluvium of Quaternary Age. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 m), irun cased Depth 112 ft (34.14 m). 
DATUM.--Elevation of land-surface datum is 35.32 ft (10.77 m) above mean sea level. 
Measuring point: Bottom of clean-out shelter door, 2.50 ft (0.76 m) above land-surface datum. Prior to August 
1981, top of recorder shelter floor, 4.00 ft (1.22 m) above land-surface datum. 
REMARKS. Recording observation well. 
PERIOD OF RECORD.--April 1967 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 8.45 ft (2.58 m) below land-surface datum, Dec. 10, 
1970; lowest water level recorded, 49.18 ft (14.99 m) below land-surface datum, July 27, 1974. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
24.01 
18.60 
18.46 
19.59 
21.28 
21.45 
22.03 
23.74 
22.71 
23.35 
25.07 
23.37 
2 
23.87 
18.58 
18.47 
19.70 
20.72 
21.43 
22.24 
23.15 
22.70 
23.73 
25.11 
23.41 
3 
23.75 
18.57 
18.48 
19.89 
20.99 
21.43 
23.05 
23.13 
22.71 
24.01 
24.97 
23.44 
4 
23.84 
18.57 
18.50 
19.86 
20.30 
21.43 
22.52 
23.54 
23.23 
24.10 
24.87 
23.48 
5 
23.81 
18.56 
18.50 
19.77 
21.12 
21.74 
23.10 
23.98 
22.79 
23.85 
25.04 
23.53 
6 
23.76 
18.56 
18.51 
19.78 
21.25 
21.81 
22.71 
24.15 
22.77 
23.44 
24.70 
24.12 
7 
20.58 
18.53 
18.56 
19.83 
21.33 
21.73 
23.19 
24.14 
22.79 
23.49 
24.52 
24.51 
8 
19.16 
18.52 
18.56 
19.97 
21.29 
22.15 
23.02 
24.26 
22.77 
23.99 
24.85 
24.14 
9 
19.06 
18.52 
18.60 
20.09 
20.77 
22.21 
23.28 
24.41 
22.77 
24.12 
24.97 
24.56 
10 
19.10 
18.49 
18.73 
20.18 
20.77 
22.24 
23.10 
23.95 
22.79 
24.28 
24.86 
24.78 
11 
19.14 
18.45 
18.69 
20.22 
20.69 
22.45 
23.13 
23.15 
22.78 
24.37 
24.77 
24.83 
12 
19.23 
18.45 
18.73 
20.18 
20.66 
22.37 
22.86 
22.99 
22.33 
24.43 
24.87 
25.03 
13 
19.34 
18.44 
18.86 
20.16 
20.70 
22.14 
22.59 
22.81 
23.18 
24.40 
24.94 
25.18 
14 
19.22 
18.44 
18.90 
20.19 
20.21 
22.08 
23.34 
22.43 
23.69 
24.23 
25.13 
24.27 
15 
19.25 
18.43 
18.84 
20.25 
20.69 
22.28 
23.13 
22.35 
23.60 
24.32 
25.21 
24.22 
16 
19.32 
18.41 
18.88 
20.31 
20.66 
21.89 
23.46 
22.31 
23.51 
24.48 
25.02 
24.92 
17 
19.30 
18.44 
18.92 
20.44 
20.79 
21.94 
23.44 
22.32 
22.62 
24.25 
24.99 
24.73 
18 
19.31 
18.42 
19.05 
20.45 
21.11 
22.52 
23.30 
22.35 
23.11 
24.53 
24.94 
24.90 
19 
19.43 
18.40 
19.14 
20.35 
21.13 
22.40 
23.52 
22.35 
23.68 
24.60 
25.16 
24.68 
20 
19.66 
18.41 
19.18 
20.35 
21.07 
22.89 
22.67 
22.38 
23.32 
24.60 
25.30 
24.88 
21 
19.61 
18.44 
19.21 
20.41 
21.10 
23.03 
23.41 
22.39 
22.97 
24.36 
25.39 
24.89 
22 
19.27 
18.49 
19.15 
20.53 
21.19 
23.06 
23.52 
22.42 
23.37 
24.56 
25.48 
24.90 
23 
19.28 
18.50 
19.18 
20.48 
21.21 
22.19 
23.41 
22.45 
23.77 
24.68 
25.17 
24.95 
24 
19.26 
18.45 
19.35 
20.57 
20.90 
23.17 
23.47 
22.48 
23.88 
24.76 
24.67 
25.13 
25 
19.09 
18.45 
19.38 
20.53 
21.20 
23.42 
23.52 
22.49 
23.76 
24.87 
24.97 
25.21 
26 
19.05 
18.48 
19.40 
20.54 
21.28 
23.50 
23.45 
22.50 
23.81 
24.90 
25.09 
25.27 
27 
19.07 
18.48 
19.45 
20.65 
21.39 
22.95 
22.70 
22.54 
23.94 
24.36 
24.85 
25.17 
28 
19.06 
18.47 
19.46 
21.08 
21.50 
22.19 
23.52 
22.60 
23.98 
23.75 
25.12 
24.69 
29 
19.00 
18.47 
19.40 
21.03 
22.01 
23.60 
22.79 
23.28 
24.80 
24.04 
25.11 
30 
18.83 
18.48 
19.56 
21.00 
21.97 
23.78 
22.82 
23.21 
24.92 
23.50 
25.35 
31 
18.66 
19.64 
20.88 
21.97 
22.73 
24.98 
23.37 
LOW 
24.01 
18.60 
19.64 
21.08 
21.50 
23.50 
23.78 
24.41 
23.98 
24.98 
25.48 
25.35 
HIGH 
18.66 
18.40 
18.46 
19.59 
20.21 
21.43 
22.03 
22.31 
22.62 
23.35 
23.37 
23.37 
WTR YR 1986 
MEAN 22.0 
LOW 25.48 
HIGH 18.40 
16 
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21 
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to
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Z 31 
ce 
36 ONDJFMAMJJ ASONDJFMAMJJ ASONDJFMAMJJ AS 
1983 1944 
1985 
1986 
328 
        
 
 
 
   
 
329 
GROUND-WATER LEVELS 
RIO INABON TO RIO LOCO BASINS 
180133066503300. Local number, 132. 
LOCATION.--Lat 18°01'33", long 66°50'33". 
Owner: Pittsburg Plate Glass 4. 
Name: Yauco 2. 
AQUIFER.--Limestone of Tertiary Age. 
WELL CHARACTERISTICS.--Drilled observation well, cased 20 in (0.51 m) 0-20 ft (0-6.1 m), 12 in (0.30 m) perforated 
pipe 20-84 ft (6.1-'5.61 m), 10 in (0.25 m) perforated pipe 84-190 ft (25.61-57.93 m). Depth 190 ft (57.93 m). 
DATUM.--Elevation of land-surface datum is about 75 ft (22.87 m) above mean sea level, from topographic map. 
Measuring point: Top of shelter floor, 2.35 ft (0.72 m) above land-surface datum. 
REMARKS.--Recording observation well. 
PERIOD OF RECORD.--July 1972 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, +0.12 ft (0.04 m) below land-surface datum, July 19, 
1979; lowest water level recorded, 36.91 ft (11.25 m) below land-surface datum, June 27, 1974. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
7.42 
2.45 
5.34 
6.57 
7.26 
8.05 
9.94 
10.04 
5.69 
7.40 
8.98 
10.62 
2 
7.46 
2.45 
5.34 
6.64 
7.26 
8.08 
9.90 
9.80 
5.75 
7.43 
9.00 
10.40 
3 
7.51 
2.45 
5.37 
6.68 
7.30 
8.14 
10.02 
9.83 
5.83 
7.61 
9.08 
10.54 
4 
7.53 
2.45 
5.37 
6.68 
7.31 
8.20 
10.01 
9.91 
5.84 
7.67 
9.11 
10.56 
5 
7.54 
2.45 
5.37 
6.69 
7.28 
8.25 
9.31 
9.94 
5.94 
7.76 
9.29 
10.56 
6 
2.45 
5.37 
6.69 
7.28 
8.28 
9.15 
10.04 
6.04 
7.71 
9.31 
10.63 
7 
2.45 
5.37 
6.83 
7.30 
8.32 
9.25 
10.04 
6.14 
7.85 
9.44 
10.68 
8 
---
2.45 
5.37 
6.83 
7.32 
8.39 
9.27 
9.74 
6.22 
7.93 
9.14 
10.78 
9 
4.22 
2.45 
6.21 
6.85 
7.33 
8.43 
9.23 
9.57 
6.28 
8.02 
9.11 
10.78 
10 
4.25 
2.45 
6.23 
6.86 
7.34 
8.51 
9.21 
9.50 
6.34 
8.10 
9.13 
10.84 
11 
4.32 
2.45 
6.24 
6.84 
7.39 
8.56 
9.25 
8.24 
6.41 
8.20 
9.16 
10.90 
12 
4.32 
2.45 
6.27 
6.85 
7.40 
8.63 
9.31 
7.88 
6.14 
8.25 
9.25 
11.04 
13 
4.32 
2.45 
6.28 
6.90 
7.40 
8.69 
9.35 
6.26 
6.24 
8.23 
9.32 
11.10 
14 
4.32 
2.45 
6.28 
6.96 
7.40 
8.73 
9.40 
4.44 
6.32 
8.36 
9.44 
11.13 
15 
4.33 
5.69 
6.30 
7.00 
7.49 
8.78 
9.47 
5.44 
6.43 
8.41 
9.44 
11.24 
16 
4.33 
5.70 
6.31 
6.99 
7.50 
8.85 
9.56 
5.82 
6.47 
8.30 
9.52 
11.31 
17 
4.33 
5.67 
6.33 
7.01 
7.54 
8.93 
9.65 
5.95 
6.54 
8.42 
9.57 
11.35 
18 
4.33 
5.31 
6.34 
7.02 
7.60 
8.98 
9.71 
6.07 
6.60 
8.44 
9.70 
11.42 
19 
4.33 
5.33 
6.30 
7.04 
7.63 
9.10 
9.80 
6.11 
6.64 
8.52 
9.70 
11.49 
20 
4.38 
5.33 
6.34 
7.10 
7.66 
9.16 
9.84 
6.16 
6.69 
8.51 
9.88 
11.55 
21 
4.38 
5.33 
6.34 
7.10 
7.70 
9.30 
10.03 
6.20 
6.70 
8.69 
10.08 
11.51 
22 
4.38 
5.33 
6.35 
7.15 
7.70 
9.33 
10.09 
6.24 
6.80 
8.73 
10.19 
11.16 
23 
4.38 
5.33 
6.37 
7.18 
7.80 
9.36 
10.15 
6.31 
6.84 
8.78 
10.27 
11.24 
24 
3.35 
5.33 
6.30 
7.24 
7.83 
9.45 
10.21 
6.40 
6.94 
8.86 
10.33 
11.31 
25 
3.35 
5.33 
6.40 
7.23 
7.84 
9.45 
10.30 
6.50 
7.02 
8.92 
10.45 
11.34 
26 
3.35 
5.33 
6.40 
7.21 
7.90 
9.57 
10.44 
6.58 
7.08 
8.91 
10.49 
11.45 
27 
3.35 
5.33 
6.44 
7.24 
7.95 
9.64 
10.45 
6.63 
7.10 
8.84 
10.56 
11.17 
28 
3.35 
5.33 
6.44 
7.28 
7.99 
9.67 
10.57 
6.68 
7.20 
8.87 
10.68 
9.87 
29 
3.35 
5.34 
6.50 
7.32 
---
9.69 
10.70 
6.76 
7.22 
8.87 
10.76 
9.77 
30 
3.35 
5.34 
6.54 
7.24 
9.70 
10.84 
5.68 
7.30 
8.92 
10.68 
9.88 
31 
2.45 
---
6.54 
7.28 
9.85 
---
5.66 
---
8.96 
10.60 
---
LOW 
5.70 
6.54 
7.32 
7.99 
9.85 
10.84 
10.04 
7.30 
8.96 
10.76 
11.55 
HIGH 
2.45 
5.34 
6.57 
7.26 
8.05 
9.15 
4.44 
5.69 
7.40 
8.98 
9.77 
s 
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14
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18 ONDJ FMAMJJ ASONDJ FMAMJJ ASONDJ FMAMJJ AS 
1983 1954 
1985 
1986 
+ Above land-surface datum. 
 
 
            
 
 
 
330 
GROUND-WATER LEVELS 
RIO INABON TO RIO LOCO BASINS 
175950066354200. Local number, 141. 
LOCATION.--Lat 17°59'50", long 66°35'42". 
Owner: P.R. Aqueduct and Sewer Authority. 
Name: Restaurada 8A. 
AQUIFER.--Alluvium of Quaternary Age. 
WELL CHARACTERISTICS.--Drilled unused public supply well, diameter 16-10 in (0.41-0.25 m), cased 16 in (0.41 m) 
2-20 ft (0.6-6.1 m), perforated 20-130 ft (6.1-39.6 m), 10 in (0.25 m) 128-165 ft (39.0-50.3 m), perforated. 
Depth 165 ft (50.3 m). 
DATUM.--Elevation of land-surface datum is about 24 ft (7.3 m) above mean sea level, from topographic map. 
Measuring point: Bottom edge of hole on side of casing, 1.9 ft (0.58 m) above land-surface datum, 26.15 ft 
(7.97 m) above mean sea level. 
REMARKS.--Recording observation well. 
PERIOD OF RECORD.--October 1981 to March 1, 1986, discontinued. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 11.19 ft (3.41 m) below land-surface datum, Oct. 09, 
1985; 
lowest water level recorded, 28.59 ft (8.714 m) below land-surface datum, July 9, 1982. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
14.56 
12.12 
13.25 
17.07 
16.35 
2 
14.60 
12.06 
13.34 
16.89 
---
3 
14.68 
11.95 
13.57 
16.79 
4 
15.47 
11.83 
13.59 
-
16.23 
5 
15.36 
11.82 
13.62 
-
16.00 
6 
14.76 
11.86 
13.66 
15.98 
7 
12.78 
11.87 
13.71 
16.06 
8 
11.22 
11.94 
13.73 
---
16.10 
9 
11.24 
11.96 
13.77 
13.77 
16.12 
10 
11.39 
12.00 
13.84 
14.36 
16.14 
11 
11.47 
12.05 
13.87 
14.51 
16.08 
12 
11.61 
12.16 
13.97 
14.49 
16.07 
13 
11.68 
12.24 
14.03 
14.46 
16.08 
14 
11.79 
12.31 
14.15 
14.48 
16.21 
15 
11.89 
12.38 
14.80 
14.58 
16.08 
16 
12.05 
12.41 
15.01 
14.59 
15.99 
17 
12.19 
12.42 
15.08 
14.55 
15.97 
18 
12.32 
12.50 
15.14 
16.17 
16.04 
19 
12.40 
12.60 
15.12 
16.60 
16.08 
20 
12.45 
12.69 
15.02 
16.72 
16.03 
21 
12.56 
12.79 
14.89 
16.80 
15.94 
22 
12.66 
12.86 
14.73 
16.94 
15.87 
23 
12.71 
12.95 
14.54 
17.08 
15.77 
24 
12.55 
12.99 
14.22 
17.21 
15.68 
25 
12.48 
13.06 
17.24 
15.74 
26 
12.46 
13.12 
17.22 
15.67 
27 
12.41 
13.20 
17.28 
15.96 
28 
12.41 
13.23 
17.42 
16.26 
29 
12.37 
13.24 
17.54 
30 
12.36 
13.25 
17.27 
31 
12.22 
17.23 
LOW 
15.47 
13.25 
17.07 
HIGH 
11.22 
11.82 
15.67 
9 
< 14 
ta a 
19 ''‘PtieN"vut\4\1 
z 
24 
crz 29 
ONDJFMAMJJ ASONDJFMAMJJ ASONDJFMAIAJJ AS 
1983 1984 
1985 
1986 
4 
   
  
 
 
331 
GROUND-WATER LEVELS 
RIO GUANAJIBO BASIN 
180132067033800. Local number, 143. 
LOCATION.--Lat 18°01'32", long 67°03'38". 
Owner: Pedro P. Vivoni. 
Name: Vivoni, Hacienda Amistad. 
AQUIFER.--Limestone of unknown age. 
WELL CHARACTERISTICS.--Drilled unused irrigation well, diameter 12 in (0.30 m). Depth 200 ft (60.98 m). 
DATUM.--Elevation of land-surface datum is about 52.5 ft (16.0 m) above mean sea level, from topographic map. 
Measuring point: Hole side of casing, 0.80 ft (0.24 m) above land-surface datum. 
REMARKS.--Recording observation well. 
PERIOD OF RECORD.--December 1981 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 37.36 ft (11.39 m) below land-surface datum, Nov. 20, 
1985; lowest water level recorded, 39.70 ft (12.10 m) below land-surface datum, June. 29, 1984. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
39.35 
38.72 
37.77 
38.17 
38.51 
38.72 
38.96 
39.09 
38.73 
38.78 
38.80 
38.88 
2 
39.37 
38.72 
37.80 
38.15 
38.51 
38.71 
38.95 
39.10 
38.73 
38.78 
38.83 
38.92 
3 
39.40 
38.72 
37.78 
38.14 
38.48 
38.74 
38.98 
39.09 
38.73 
38.78 
38.84 
38.95 
4 
39.40 
38.10 
37.79 
38.18 
38.49 
38.78 
38.99 
39.12 
38.73 
38.78 
38.84 
38.95 
5 
39.37 
38.05 
37.74 
38.22 
38.51 
38.79 
38.99 
39.11 
38.74 
38.78 
38.86 
38.94 
6 
39.30 
38.11 
37.70 
38.25 
38.55 
38.78 
39.00 
39.11 
38.74 
38.79 
38.87 
38.95 
7 
38.72 
38.07 
37.72 
38.23 
38.58 
38.80 
39.01 
39.05 
38.74 
38.80 
38.85 
38.96 
8 
38.72 
38.02 
37.77 
38.26 
38.56 
38.84 
39.02 
39.01 
38.74 
38.81 
38.85 
38.95 
9 
38.72 
38.04 
37.78 
38.29 
38.58 
38.86 
39.02 
39.01 
38.74 
38.75 
38.86 
38.97 
10 
38.72 
38.01 
37.80 
38.29 
38.59 
38.87 
39.02 
38.99 
38.74 
38.75 
38.87 
38.97 
11 
38.67 
37.94 
37.80 
38.29 
38.61 
38.84 
39.02 
38.86 
38.74 
38.73 
38.87 
38.88 
12 
38.74 
37.90 
37.84 
38.29 
38.61 
38.84 
39.02 
38.86 
38.74 
38.72 
38.89 
38.88 
13 
38.73 
37.83 
37.99 
38.29 
38.61 
38.85 
39.00 
38.74 
38.74 
38.73 
38.88 
38.93 
14 
38.72 
37.77 
37.99 
38.32 
38.60 
38.85 
39.00 
38.74 
38.74 
38.72 
38.88 
38.96 
15 
38.72 
37.76 
38.00 
38.34 
38.61 
38.85 
39.01 
38.73 
38.75 
38.68 
38.86 
38.97 
16 
38.73 
37.73 
38.02 
38.39 
38.63 
38.85 
39.04 
38.73 
38.75 
38.68 
38.87 
38.98 
17 
38.73 
37.72 
38.04 
38.37 
38.65 
38.86 
39.06 
38.73 
38.75 
38.69 
38.90 
38.97 
18 
38.73 
37.79 
38.04 
38.34 
38.61 
38.88 
39.07 
38.73 
38.75 
38.71 
38.92 
38.98 
19 
38.72 
37.81 
38.04 
38.37 
38.59 
38.90 
39.06 
38.73 
38.75 
38.71 
38.94 
38.99 
20 
38.72 
37.78 
38.07 
38.41 
38.60 
38.91 
39.08 
38.74 
38.75 
38.72 
38.96 
39.00 
21 
38.72 
37.74 
38.06 
38.42 
38.61 
38.91 
39.10 
38.74 
38.76 
38.76 
38.96 
38.98 
22 
38.72 
37.76 
38.08 
38.41 
38.63 
38.92 
39.13 
38.74 
38.76 
38.81 
38.92 
38.94 
23 
38.72 
37.77 
38.05 
38.44 
38.65 
38.95 
39.14 
38.74 
38.76 
38.81 
38.86 
38.93 
24 
38.72 
37.77 
38.13 
38.43 
38.67 
38.98 
39.12 
38.74 
38.76 
38.78 
38.86 
38.96 
25 
38.72 
37.76 
38.13 
38.43 
38.64 
38.99 
39.12 
38.74 
38.76 
38.78 
38.92 
38.98 
26 
38.72 
37.77 
38.13 
38.41 
38.65 
38.98 
39.11 
38.74 
38.76 
38.80 
38.95 
38.99 
27 
38.72 
37.76 
38.16 
38.42 
38.68 
38.97 
39.11 
38.74 
38.77 
38.79 
38.92 
38.95 
28 
38.72 
37.79 
38.13 
38.47 
38.72 
38.97 
39.08 
38.74 
38.77 
38.78 
38.89 
38.94 
29 
38.72 
37.80 
38.13 
38.47 
---
38.98 
39.09 
38.74 
38.77 
38.79 
38.90 
38.98 
30 
38.72 
37.77 
38.13 
38.49 
38.97 
39.08 
38.73 
38.77 
38.79 
38.92 
39.01 
31 
38.72 
---
38.16 
38.48 
38.97 
---
38.73 
---
38.79 
38.89 
---
LOW 
39.40 
38.72 
38.16 
38.49 
38.72 
38.99 
39.14 
39.12 
38.77 
38.81 
38.96 
39.01 
HIGH 
38.67 
37.72 
37.70 
38.14 
38.48 
38.71 
38.95 
38.73 
38.73 
38.68 
38.80 
38.88 
WTR YR 1986 
MEAN 38.6 
LOW 39.40 
HIGH 37.70 
37 
`cgp 
1-4 
Lao 
1.41 
38 
wu.) 39 
40 ONDJEMAMJJASONDJFMAMJJASONDJFMAMJJAS 
1983 1984 
1985 
1986 
  
 
 
 
   
332 
GROUND-WATER LEVELS 
RIO CULEBRINAS BASIN 
182018066593200. Local number, 83. 
LOCATION.--Lat 18°20'18", long 66°59'32". 
Owner: P.R. Energy and Power Authority. 
Name: 
San Sebastian Well. 
AQUIFER.--San Sebastian Formation. 
WELL CHARACTERISTICS.--Drilled observation well, diameter 6 in (0.15 m), cased 6 in (0.15 ii). Depth 300 ft 
(91.4 m). 
DATUM.--Elevation of land-surface datum is about 230 ft (70.1 m) above mean sea level, from topographic map. 
Measuring point: Shelter floor on top of 6 in (0.15 m) casing, 2.75 ft (0.84 m) above land-surface datum. 
Prior November 1985, top of casing, 2.40 ft (0.73 m) above land-surface datum. 
REMARKS.--Observation well. Automatic recorder installed on November 14, 1985. Formerly published as 
182032066591800 
PERIOD OF RECORD.--May 1967 to January 16, 1985. November 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 21.95 ft (6.69 m) below land-surface datum, May 8, 
1986; 
lowest water level recorded, 40.20 ft (12.25 m) below land-surface datum, Jan. 29, 1986. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
27.86 
29.28 
29.72 
29.56 
28.95 
26.46 
26.50 
28.06 
28.27 
28.53 
2 
27.93 
29.30 
29.71 
29.56 
29.00 
26.08 
26.65 
28.12 
28.33 
28.57 
3 
28.01 
29.33 
29.68 
29.59 
29.02 
26.03 
26.79 
28.19 
28.37 
28.30 
4 
28.08 
29.37 
29.60 
29.36 
28.90 
25.49 
26.91 
28.26 
28.40 
28.23 
5 
28.14 
29.40 
29.61 
29.33 
28.79 
25.40 
27.06 
28.31 
28.46 
28.24 
6 
28.27 
29.43 
29.62 
29.32 
28.76 
25.05 
27.20 
28.37 
28.49 
28.30 
7 
28.35 
29.45 
29.62 
29.32 
28.76 
24.43 
27.30 
28.39 
28.52 
28.36 
8 
28.40 
29.48 
29.62 
29.35 
28.69 
24.36 
27.36 
28.42 
28.51 
28.42 
9 
28.46 
29.53 
29.63 
29.37 
28.41 
24.68 
27.37 
28.46 
28.50 
28.49 
10 
28.52 
29.44 
29.64 
29.37 
28.40 
24.89 
27.46 
28.49 
28.39 
28.54 
11 
28.56 
29.44 
29.66 
29.37 
28.43 
24.81 
27.22 
28.53 
28.38 
28.56 
12 
28.62 
29.45 
29.66 
29.36 
28.47 
25.03 
27.28 
28.58 
28.42 
28.61 
13 
28.66 
29.46 
29.66 
29.38 
28.50 
24.76 
27.34 
28.62 
28.46 
28.69 
14 
28.70 
29.50 
29.69 
29.39 
28.55 
24.46 
27.42 
28.65 
28.49 
28.74 
15 
28.25 
28.74 
29.51 
29.70 
29.40 
28.61 
24.57 
27.53 
28.66 
28.51 
28.77 
16 
28.01 
28.77 
29.55 
29.72 
29.38 
28.68 
24.87 
27.62 
28.59 
28.44 
28.81 
17 
27.89 
28.81 
29.55 
29.73 
29.37 
28.72 
25.20 
27.69 
28.61 
28.45 
28.84 
18 
27.81 
28.84 
29.55 
29.71 
29.24 
28.77 
25.54 
27.77 
28.64 
28.47 
28.88 
19 
26.77 
28.90 
29.58 
29.69 
29.22 
28.79 
25.83 
27.80 
28.67 
28.50 
28.92 
20 
26.82 
28.92 
29.60 
29.64 
29.23 
28.84 
26.04 
27.75 
28.69 
28.56 
28.96 
21 
26.91 
28.93 
29.62 
29.50 
29.24 
28.83 
26.24 
27.77 
28.61 
28.62 
28.98 
22 
27.02 
28.97 
29.65 
29.51 
29.26 
28.72 
26.19 
27.50 
28.65 
28.64 
29.00 
23 
27.13 
29.00 
29.66 
29.52 
29.30 
28.67 
26.34 
27.44 
28.68 
28.66 
29.01 
24 
27.22 
29.06 
29.68 
29.53 
29.31 
28.24 
26.47 
27.46 
28.71 
28.71 
29.06 
25 
27.33 
29.09 
29.69 
29.50 
29.34 
27.98 
26.60 
27.52 
28.73 
28.73 
29.10 
26 
27.43 
29.12 
29.70 
29.51 
29.33 
27.99 
26.74 
27.62 
28.66 
28.77 
29.05 
27 
27.53 
29.16 
29.71 
29.53 
29.34 
27.52 
26.60 
2'.75 
28.30 
28.77 
29.06 
28 
27.61 
29.18 
29.76 
29.56 
29.33 
27.41 
26.45 
27.82 
28.29 
28.68 
29.08 
29 
27.72 
29.18 
29.76 
29.17 
26.96 
26.49 
27.91 
28.33 
28.68 
28.93 
30 
27.77 
29.23 
29.77 
28.95 
26.74 
26.35 
27.98 
28.36 
28.62 
28.95 
31 
29.26 
29.71 
28.95 
26.41 
28.28 
28.51 
LOW 
29.26 
29.77 
29.73 
29.59 
29.02 
26.74 
27.98 
28.73 
28.77 
29.10 
HIGH 
27.86 
29.28 
29.50 
28.95 
26.74 
24.36 
26.50 
28.06 
28.27 
28.23 
24 
c;R 
0 26 
z< 
-4&• 28 
LaJ > 
30 
z 
< 
32 
JUL AUG SEP 
1985 
1986 
NOV DEC JAN FEB MAR APR MAY JUN 
 
 
  
 
  
 
  
 
333 
GROUND-WATER LEVELS 
RIO CULEBRINAS BASIN 
182445067091700. Local number, 200 . 
LOCATION.--Lat 18°24'41", long 67°09'17". 
Owner: Carmelo Sanchez 
Name: Aguadilla Cement Well. 
AQUIFER.--Surficial deposits. 
WELL CHARACTERISTICS.--Abandoned water-table industrial well, diameter 4 in (0.10 m), cased 0-20 ft (0-6.10 m), 
perforated 11-20 ft (3.35-6.10 m). Depth 20 ft (6.10 m). 
DATUM.--Elevation of land-surface datum is about 10 ft (3.05 m) above mean sea level, from topographic map. 
Measuring point: Shelter floor on top of 4 in (0.10 m) casing, 3.25 ft (0.99 m) above land-surface datum. 
REMARKS.--Observation well. Automatic recorder installed on November 1985. Water levels affected by nearby 
pumping well. Estimated noon values: Nov. 19-Dec 5. 
PERIOD OF RECORD.--October 1985 to September 1986. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 2.85 ft (0.87 m) below land-surface datum, May 14, 
1986; lowest water level recorded, 8.46 ft (2.58 m) below land-surface datum, Apr. 17, 1986. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION 
Water 
Water 
Date 
level 
Date 
level 
Oct. 09 
3.27 
Nov. 14 
4.75 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
6.41 
6.66 
8.21 
7.88 
5.57 
5.79 
5.52 
6.21 
2 
6.55 
6.66 
8.23 
7.96 
5.08 
5.83 
5.70 
6.34 
3 
6.70 
6.66 
8.26 
8.02 
5.31 
6.16 
5.78 
6.44 
4 
6.84 
6.66 
---
8.26 
8.08 
3.89 
5.86 
5.91 
6.28 
5 
7.02 
6.66 
7.72 
8.26 
8.00 
4.16 
5.94 
5.98 
6.35 
6 
7.00 
6.66 
7.78 
8.27 
8.07 
4.25 
5.97 
5.99 
6.36 
7 
7.07 
6.67 
7.86 
8.29 
8.15 
3.56 
5.78 
6.08 
6.41 
8 
7.14 
6.75 
7.87 
8.30 
8.20 
3.75 
5.56 
6.39 
6.47 
9 
7.17 
6.78 
7.91 
8.22 
8.23 
4.02 
5.95 
6.15 
6.59 
10 
7.20 
6.88 
7.95 
8.23 
8.25 
4.14 
6.18 
5.66 
6.63 
11 
7.21 
6,90 
7.97 
8.27 
8.29 
4.21 
6.04 
5.90 
6.64 
12 
7.26 
---
8.00 
8.15 
8.32 
4.52 
5.97 
5.34 
6.67 
13 
7.29 
8.05 
8.19 
8.34 
3.72 
6.01 
5.72 
6.70 
14 
---
7.37 
8.04 
8.23 
8.38 
3.02 
6.12 
5.62 
6.72 
15 
4.70 
7.40 
8.07 
8.27 
8.41 
3.28 
5.97 
5.88 
6.77 
16 
4.22 
7.41 
8.09 
8.27 
8.43 
3.33 
6.36 
5.86 
6.81 
17 
3.91 
7.42 
8.09 
8.10 
7.35 
3.50 
6.17 
5.91 
6.83 
18 
4.13 
7.43 
8.11 
8.10 
6.80 
3.57 
5.98 
6.03 
6.87 
19 
4.66 
7.42 
8.11 
8.18 
6.85 
4.21 
6.03 
6.46 
6.91 
20 
4.80 
7.47 
8.13 
8.22 
6.91 
4.05 
6.09 
6.64 
6.94 
21 
4.95 
7.49 
8.15 
8.26 
7.00 
3.93 
6.02 
6.32 
6.96 
22 
5.09 
7.48 
8.15 
8.28 
7.06 
4.10 
6.21 
6.17 
7.00 
23 
5.24 
7.48 
8.15 
8.30 
7.10 
3.85 
6.18 
6.19 
7.05 
24 
5.38 
7.50 
8.17 
8.34 
7.13 
4.02 
6.32 
6.24 
7.07 
25 
5.53 
7.55 
8.18 
8.36 
6.97 
4.22 
6.23 
6.30 
7.09 
26 
5.68 
7.57 
8.19 
8.37 
7.03 
6.31 
6.37 
6.72 
27 
5.82 
7.50 
8.20 
8.38 
6.70 
---
6.31 
6.53 
6.81 
28 
5.97 
7.40 
8.21 
8.39 
6.24 
5.55 
6.29 
6.01 
6.89 
29 
6.11 
7.40 
---
8.09 
5.92 
5.62 
6.77 
6.08 
6.94 
30 
6.26 
7.43 
7.92 
5.45 
5.75 
5.55 
6.08 
6.99 
31 
---
7.56 
7.88 
---
---
5.37 
6.11 
---
LOW 
7.57 
8.39 
8.43 
6.77 
6.64 
7.09 
HIGH 
6.41 
7.88 
5.45 
5.37 
5.34 
6.21 
2 
Lai 
co 
4
1:4 ta< 
t 
z < 
6 
> 
8
0 
crz 
10 
NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 
1985 
1986 
Surf ace-
Water 
Records 
for 
U.S. Virgin Islands 
I
I
I
I
I
I
I
I
  
 
 
 
 
 
I
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
337 
ST. THOMAS, U.S. VIRGIN ISLANDS 
50252000 BONNE RESOLUTION GUT AT BONNE RESOLUTION, ST. THOMAS, VI 
LOCATION.--Lat 18°21'57", long 64°57'34", Hydrologic Unit 21020001, on right bank near Hull Bay Road, 0.5 i 
(0.8 km) upstream from Atlantic Ocean, and 2.5 mi (4.02 km) northwest of Fort Christian, Charlotte Amalie. 
DRAINAGE AREA.--0.49 mi' (1.27 km2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--December 1962 to February 1967, March 1979 to April 1981, May 1982 to current year. 
GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 280 ft (85 m), from topographic map. 
December 1962 to February 1967 at site about 100 ft (30 ) downstream at different datum. March 1979 to April 
1981 at site about 100 ft (30 ) upstream at different datum. 
REMARKS.--Estimated daily discharges: Nov. 26 to Dec. 6 and June 6-30. Records poor. 
AVERAGE DISCHARGE.--8 years (1964-66, 1980, 1983-86), 0.29 ft'/s (0.008 3/s), 8.04 in/yr (204 m/yr), 
210 acre-ft/yr (0.259 110/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,650 ft'is (46.7 m 3/s), Apr. 18, 1983, gage height, 7.00 ft 
(2.134 ), from floodmarks, from rating curve extended above 1.0 ft'/s (0.03 '/s) on basis of critical-depth 
analysis and slope-area measurement of peak flow; no flow at times in most years. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 50 ft'/s (1.42 '/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(ft'/s) 
(m'/s) 
(ft) 
(m) 
Date 
Time 
(ft'/s) 
(m0/s) 
(ft) 
(m) 
Oct. 6 
0230 
58 
1.64 
1.52 0.463 
Nov. 17 
1600 
118 
3.34 
1.98 0.604 
Oct. 29 
2300 
*559 
15.8 
*4.02 1.225 
Apr. 29 
2345 
56 
1.59 
1.50 0.457 
Oct. 30 
1915 
56 
1.59 
1.50 0.457 
May 13 
1830 
191 
5.41 
2.42 0.738 
Nov. 5 
1000 
556 
15.7 
4.01 1.222 
No flow any days. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
.06 
.67 
.10 
.03 
.00 
.11 
.05 
1.1 
.40 
.08 
.08 
.17 
2 
.06 
.40 
.09 
.03 
.00 
.12 
.06 
.43 
.40 
.07 
.10 
.09 
3 
.05 
.28 
.08 
.03 
.00 
.11 
.03 
.50 
.40 
.09 
.12 
.07 
4 
.06 
.20 
.07 
.03 
.00 
.07 
.01 
.17 
.40 
.09 
.13 
.07 
5 
.44 
32 
.08 
.02 
.00 
.08 
.00 
.08 
.30 
.08 
.13 
.09 
6 
20 
.94 
.07 
.02 
.00 
.09 
.00 
.06 
.30 
.08 
.11 
.07 
7 
5.6 
.44 
.06 
.02 
.00 
.11 
.00 
.96 
.25 
.09 
.04 
.05 
8 
1.0 
.32 
.05 
.01 
.00 
.12 
.00 
.91 
.25 
.09 
.08 
.05 
9 
.44 
.22 
.06 
.05 
.00 
.13 
.01 
.15 
.25 
.08 
.07 
.05 
10 
.29 
.15 
.06 
.03 
.00 
.15 
.01 
3.2 
.30 
.08 
.02 
.04 
11 
.15 
.13 
.06 
.02 
.00 
.13 
.02 
1.6 
.25 
.08 
.08 
.04 
12 
.10 
.76 
.06 
.01 
.00 
.10 
.01 
.25 
.20 
.06 
.07 
.03 
13 
.07 
.36 
.06 
.01 
.01 
.09 
.01 
13 
.25 
.19 
.10 
.03 
14 
.05 
.25 
.05 
.01 
.01 
.08 
.02 
2.2 
:20 
.04 
.24 
.03 
15 
.05 
1.0 
.05 
.01 
.01 
.06 
.02 
.55 
.30 
.09 
.08 
.03 
16 
.05 
4.4 
.05 
.01 
.01 
.05 
.01 
.40 
.25 
.07 
.11 
.03 
17 
.05 
8.2 
.05 
.01 
.01 
.05 
.01 
.40 
.20 
.09 
.07 
.02 
18 
.07 
.94 
.05 
.01 
.00 
.03 
.02 
.41 
.17 
.13 
.07 
.02 
19 
.05 
.36 
.07 
.01 
.00 
.02 
.02 
.41 
.20 
.13 
.06 
.02 
20 
.05 
.28 
.05 
.01 
.00 
.02 
.02 
.40 
.17 
.13 
.06 
.02 
21 
.05 
.25 
.06 
.01 
.00 
.01 
.03 
.40 
.15 
.07 
.06 
.02 
22 
.05 
.22 
.05 
.01 
.01 
.01 
.02 
.33 
.14 
.06 
.06 
.02 
23 
.05 
.20 
.05 
.01 
.01 
.01 
.02 
.42 
.13 
.07 
.05 
.00 
24 
3.8 
.15 
.04 
.02 
.02 
.00 
.02 
.40 
.12 
.10 
.05 
.00 
25 
1.4 
.12 
.04 
.01 
.03 
.00 
.01 
.33 
.11 
.09 
.06 
.00 
26 
.43 
.14 
.04 
.01 
.04 
.00 
.02 
.30 
.10 
.06 
.05 
.04 
27 
2.4 
.12 
.04 
.01 
.05 
.00 
.00 
.33 
.15 
.07 
.05 
.05 
28 
3.3 
.11 
.07 
.01 
.05 
.00 
2.9 
.41 
.11 
.07 
.07 
.05 
29 
29 
.10 
.05 
.01 
---
.00 
3.2 
.41 
.09 
.06 
.17 
.05 
30 
21 
.15 
.03 
.01 
.00 
3.6 
.41 
.08 
.08 
.06 
.05 
31 
5.5 
---
.02 
.00 
.00 
---
.40 
---
.08 
.06 
---
TOTAL 
95.67 
53.86 
1.76 
.49 
.26 
1.75 
10.15 
31.32 
6.62 
2.65 
2.56 
1.30 
MEAN 
3.09 
1.80 
.06 
.02 
.01 
.06 
.34 
1.01 
.22 
.08 
.08 
.04 
MAX 
29 
32 
.10 
.05 
.05 
.15 
3.6 
13 
.40 
.19 
.24 
.17 
MIN 
.05 
.10 
.02 
.00 
.00 
.00 
.00 
.06 
.08 
.04 
.02 
.00 
CFSM 
6.31 
3.67 
.12 
.03 
.02 
.11 
.69 
2.06 
.45 
.17 
.17 
.09 
IN. 
7.26 
4.09 
.13 
.04 
.02 
.13 
.77 
2.38 
.50 
.20 
.19 
.10 
AC-FT 
190 
107 
3.5 
.0 
.5 
3.5 
20 
62 
13 
5.3 
5.1 
2.6 
CAL YR 1985 TOTAL 163.05 
MEAN 
.45 
MAX 
32 
MIN 
.01 
CFSM 
.92 
IN. 
12.38 
AC-FT 
323 
WTR YR 1986 TOTAL 208.39 
MEAN 
.57 
MAX 
32 
MIN 
.00 
CFSM 1.16 
IN. 
15.82 
AC-FT 
413 
I 
I
I
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I
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
338 
ST. THOMAS, U.S. VIRGIN ISLANDS 
50276000 TURPENTINE RUN AT MARIENDAL, ST. THOMAS, VI 
LOCATION.--Lat 18°19'48', long 64°52'58", Hydrologic Unit 21020001, on right bank, at Mariendal, 1.0 mi (1.6 ka) 
upstream from mouth, and 3.3 mi (5.3 km) southeast of Fort Christian, Charlotte Amalie. 
DRAINAGE AREA.--2.97 mil (7.69 km 2 ). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--January 1963 to April 1969, October 1978 to September 1980, June 1982 to July 1986, July to 
Sept. 1986 (high-water discharges only). 
GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 40 ft (12 m), fro 
topographic map. 
REMARKS.--Estimated daily discharges: June 7 to July 2. Records poor. Since about 1975, low flow augmented by 
discharges from sewage plant. 
AVERAGE DISCHARGES.--10 years (1964-68, 1979-80, 1983-85), 1.22 ft'is (0.034 10/s), 5.58 in/yr (142 m /yr), 
884 acre-ft/yr (1.09 hm'/yr); median of yearly mean discharges, 0.54 ft'is (0.015 m'/s), 390 acre-ft/yr 
(0.48 hm'/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,710 ft'is (275 
'/s), Apr. 18, 1983, gage height, 11.09 ft 
(3.380 
), from floodmark, from rating curve extended above 500 ft'is (14.2 m'/s) on basis of slope area 
measurement and step-backwater analysis; no flow many days from 1963 to 1969, and in 1984. 
EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 106 WA (2.83 m'/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time 
(W/s) 
(10/s) 
(ft) 
(m) 
Date 
Time 
(W/s) 
00/s) 
(ft) 
(m) 
Oct. 
6 
0300 
138 
3.91 
2.69 0.820 
Nov. 16 
0715 
118 
3.34 
2.53 0.771 
Oct. 24 
1800 
346 
9.80 
3.92 1.195 
Apr. 28 
2100 
490 
13.9 
4.45 1.356 
Oct. 25 
2300 
537 
15.2 
4.59 1.399 
Apr. 29 
1315 
*2,050 
58.1 
*6.45 1.966 
Oct. 28 
1445 
168 
4.76 
2.92 0.890 
Apr. 30 
0015 
1,440 
40.8 
5.97 
1.820 
Nov. 
5 
1000 
193 
5.47 
3.09 0.942 
May 
3 
0545 
147 
4.16 
2.76 0.841 
Nov. 12 
1215 
253 
7.16 
3.45 1.052 
May 
7 
2045 
348 
9.86 
3.93 1.198 
Nov. 14 
2115 
302 
8.55 
3.71 1.131 
May 
18 
0730 
257 
7.28 
3.47 
1.058 
Minimum discharge, 0.09 ft'is (0.002 '/s), Mar. 24, Apr. 10, 11. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
.67 
2.7 
1.7 
.90 
.24 
.32 
.22 
7.8 
4.8 
.90 
2 
.61 
1.7 
1.6 
.97 
2.3 
.43 
.29 
5.1 
5.4 
.85 
3 
.65 
1.1 
1.5 
.85 
.33 
.28 
.37 
30 
3,6 
.83 
4 
1.1 
1.1 
1.5 
.95 
.28 
.32 
.42 
15 
2.8 
.76 
5 
7.8 
22 
1.6 
.90 
.22 
.34 
.62 
5.8 
2.4 
.74 
6 
79 
5.0 
1.5 
.76 
.18 
.44 
.57 
4.3 
2.4 
.87 
7 
29 
2.1 
1.4 
.59 
.30 
.30 
.36 
37 
2.3 
.75 
8 
7.7 
1.4 
1.6 
.62 
.29 
.37 
.47 
18 
2.2 
---
9 
3.3 
1.0 
1.5 
1.4 
.26 
.45 
.40 
5.8 
3,0 
10 
1.6 
.86 
1.3 
.89 
.28 
.33 
.11 
8.0 
4.0 
11 
.87 
.80 
2.0 
.75 
.43 
.41 
.16 
26 
2.5 
12 
.75 
38 
1.5 
.73 
.30 
.40 
.18 
8.4 
3.5 
13 
.71 
16 
1.1 
.57 
.25 
.48 
.39 
12 
4.0 
14 
.71 
40 
1.2 
.56 
.35 
.57 
.35 
13 
3.0 
15 
.53 
30 
1.2 
.52 
.35 
.60 
.23 
6.3 
5.0 
16 
.51 
39 
1.1 
.49 
.67 
.59 
.39 
4.8 
4.0 
17 
.54 
13 
.91 
.77 
.99 
.47 
.52 
4.6 
3.5 
18 
4.8 
8.4 
.92 
.58 
.32 
.45 
.56 
29 
2.0 
19 
1.7 
4.6 
.99 
.55 
.35 
.43 
.69 
7.7 
2.5 
20 
.95 
6.6 
1.1 
'.52 
.25 
.36 
.45 
4.8 
1.9 
21 
.75 
4.1 
1.1 
.40 
.31 
.37 
.22 
8.0 
1.7 
22 
.63 
3.1 
1.0 
.43 
.37 
.39 
.62 
4.8 
1.6 
23 
1.0 
2.8 
.82 
.35 
.38 
.46 
.70 
4.0 
1.5 
24 
58 
2.4 
.77 
1.4 
.23 
.18 
.35 
3.5 
1.5 
25 
35 
2.0 
.80 
.56 
.27 
.34 
.56 
3.3 
1.4 
26 
29 
2.1 
.79 
.58 
.27 
.34 
.71 
3.2 
1.3 
27 
17 
1.9 
.74 
.38 
.27 
.34 
.80 
3.0 
3.5 
28 
40 
1.9 
.80 
.37 
.26 
.55 
82 
4.4 
1.5 
29 
25 
1.7 
.97 
.28 
---
.47 
183 
2.6 
1.3 
30 
25 
2.1 
.69 
.27 
.34 
87 
2.4 
1.1 
31 
6.7 
---
.74 
.24 
.42 
---
12 
---
TOTAL 
381.58 
259.46 
36.44 
20.13 
11.30 
12.54 
363.71 
304.6 
81.2 
MEAN 
12.3 
8.65 
1.18 
.65 
.40 
.40 
12.1 
9.83 
2.71 
MAX 
79 
40 
2.0 
1.4 
2.3 
.60 
183 
37 
5.4 
MIN 
.51 
.80 
.69 
.24 
.18 
.18 
.11 
2.4 
1.1 
CFSM 
4.14 
2.91 
.40 
.22 
.13 
.13 
4.07 
3.31 
.91 
IN. . 
4.78 
3.25 
.46 
.25 
.14 
.16 
4.56 
3.82 
1.02 
AC-FT 
757 
515 
72 
40 
22 
25 
721 
604 
161 
CAL yR 1985 
TOTAL 
877.112 
MEAN 
2.40 
MAX 
79 
MIN 
.17 
CFSM 
.81 
IN. 
10.99 
AC-FT 
1740 
I
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339 
ST. JOHN, U.S. VIRGIN ISLANDS 
50295000 GUINEA GUT AT BETHANY, ST. JOHN, VI 
LOCATION.--Lat. 18°19'55', long 64°46'50% Hydrologic Unit 21020001, 600 ft (183 ) southeast of Bethany Church, 
and 1.0 i (1.6 km) east of Government House at Cruz Bay. 
DRAINAGE AREA.--0.37 mi' (0.96 km2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--January 1963 to October 1967, September 1982 to current year. 
GAGE.--Water-stage recorder and concrete control. Elevation of gage is 260 ft (79 m), from topographic nap. 
Prior to September 1982, at datum 1.00 ft (0.30 ) higher. 
REMARKS.--No estimated daily discharges during water year. Records poor. 
AVERAGE DISCHARGE.--8 years (1964-67, 1983-86), 0.10 ft'/s (0.003 m'/s), 3.60 in/yr (91 mm/yr), 71.00 acre-ft/yr 
(0.088 hm'/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 946 ft'/s (26.8 m 3/s), Apr. 18, 1983, gage height. 5.33 ft 
(1.625 m), from floodmark, from rating curve extended above 1.0 ft'/s (0.028 '/s) on basis of step-backwater 
analysis and slope-area measurement of peak flow; no flow many days each year. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 10 ft'is (0.283 m'/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time (ft'/s) (10/s) (ft) (m) 
Date 
Time (ft'/s) (e/s) (ft) (m) 
Oct. 30 
0115 
34 
0.96 
2.34 
0.713 
May 13 
1430 
14 
0.40 
2.09 0.637 
Apr. 30 
0015 
52 
1.47 
2.47 
0.753 
May 17 
2030 
19 
0.54 
2.17 0.661 
May 
3 
0730 
32 
0.91 
2.32 
0.707 
May 18 
0630 
*206 
5.83 
*3.29 1.003 
No flow many days. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
.01 
.07 
.04 
.01 
.01 
.00 
.00 
.04 
.02 
.02 
.02 
.02 
2 
.01 
.06 
.03 
.01 
.01 
.00 
.00 
.00 
.02 
.02 
.02 
.02 
3 
.01 
.06 
.02 
.01 
.01 
.00 
.00 
2.5 
.02 
.02 
.02 
.02 
4 
.01 
.06 
.02 
.01 
.01 
.00 
.00 
.02 
.02 
.02 
.02 
.02 
5 
.01 
.06 
.01 
.01 
.00 
.00 
.00 
.00 
.02 
.02 
.02 
.03 
6 
.43 
.06 
.01 
.01 
.00 
.00 
.00 
.00 
.03 
.02 
.02 
.04 
7 
.15 
.06 
.01 
.01 
.00 
.00 
.00 
.90 
.02 
.02 
.02 
.03 
8 
.01 
.06 
.01 
.01 
.00 
.00 
.00 
.38 
.02 
.02 
.02 
.03 
9 
.01 
.06 
.01 
.01 
.00 
.00 
.00 
.02 
.02 
.02 
.02 
.04 
10 
.01 
.06-
.01 
.01 
.00 
.00 
.00 
.62 
.02 
.02 
.02 
.04 
11 
.00 
.06 
.01 
.01 
.00 
.00 
.00 
3.6 
.02 
.02 
.02 
.04 
12 
.00 
.11 
.01 
.01 
.00 
.00 
.00 
.53 
.02 
.02 
.02 
.04 
13 
.00 
.16 ' 
.01 
.01 
.00 
.00 
.00 
3.0 
.02 
.02 
.02 
.05 
14 
.00 
.23 
.01 
.01 
.00 
.00 
.00 
2.7 
.02 
.02 
.02 
.05 
15 
.00 
.27 
.01 
.01 
.00 
.00 
.00 
.23 
.02 
.04 
.02 
.04 
16 
.00 
.56 
.01 
.01 
.00 
.00 
.00 
.04 
.02 
.05 
.02 
.03 
17 
.00 
.12 
.01 
.01 
.00 
.00 
.00 
1.9 
.02 
.04 
.02 
.02 
18 
.01 
.06 
.02 
.01 
.00 
.00 
.00 
9.3 
.02 
.04 
.02 
.03 
19 
.01 
.06 
.02 
.01 
.00 
.00 
.00 
.79 
.02 
.03 
.02 
.03 
20 
.01 
.10. 
.01 
.01 
.00 
.00 
.00 
.05 
.02 
.03 
.02 
.03 
21 
.00 
.05 
.01 
.01 
.00 
.00 
.00 
.69 
.02 
.02 
.02 
.04 
22 
.00 
.05 
.01 
.01 
.00 
.00 
.00 
.05 
.02 
.02 
.02 
.04 
23 
.00 
.05 
.01 
.01 
.00 
.00 
.00 
.01 
.02 
.01 
.02 
.05 
24 
.01 
.04 
.01 
.01 
.00 
.00 
.00 
.01 
.02 
.01 
.02 
.05 
25 
.01 
.04 
.01 
.01 
.00 
.00 
.00 
.01 
.02 
.01 
.02 
.05 
26 
.02 
.04 
.01 
.01 
.00 
.00 
.00 
.02 
.02 
.01 
.02 
.06 
27 
.04 
.04 
.01 
.01 
.00 
.00 
.00 
.03 
.02 
.01 
.02 
.06 
28 
.04 
.04 
.01 
.C1 
.00 
.00 
.09 
.02 
.02 
.01 
.02 
.06 
29 
.06 
.04 
.01 
.00 
.00 
.73 
.02 
.02 
.01 
.02 
.06 
30 
5.1 
.04 
.01 
.00 
.00 
4.3 
.02 
.02 
.01 
.02 
.05 
31 
1.1 
---
.01 
.00 
.00 
---
.03 
---
.02 
.02 
---
TOTAL 
7.07 
2.77 
.40 
.28 
.04 
.00 
5.12 
27.53 
.61 
.65 
.62 
1.17 
MEAN 
.23 
.09 
.01 
.01 
.00 
.00 
.17 
.89 
.02 
.02 
.02 
.04 
MAX 
5.1 
.56 
.04 
.01 
.01 
.00 
4.3 
9.3 
.03 
.05 
.02 
.06 
MIN 
.00 
.04 
.01 
.00 
.00 
.00 
.00 
.00 
.02 
.01 
.02 
.02 
CFSM 
.62 
.25 
.04 
.02 
.00 
.00 
.46 
2.41 
.05 
.06 
.05 
.11 
IN. 
.71 
.28 
.04 
.03 
.00 
.00 
.51 
2.77 
.06 
.07 
.06 
.12 
AC-FT 
14 
5.5 
.8 
.6 
.08 
.00 
10 
55 
1.2 
1.3 
1.2 
2.3 
CAL YR 1985 TOTAL 13.47 
MEAN 
.04 
MAX 
5.1 
MIN 
.00 
CFSM 
.10 
IN. 
1.35 
AC-FT 
27 
WTR YR 1986 TOTAL 46.26 
MEAN 
.13 
MAX 
9.3 
MIN 
.00 
CFSM 
.35 
IN. 
4.65 
AC-FT 
92 
  
 
 
  
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
ST. CROIX, U.S. VIRGIN ISLANDS 
50345000 JOLLY HILL GUT AT JOLLY HILL, ST. CROIX, VI 
LOCATION.--Lat 17°44'00", long 64°51'47", Hydrologic Unit 21020002, on Mahogany koad at Jolly Hill, 1.8 mi 
(2.9 km) northeast of Frederiksted. 
DRAINAGE AREA.--2.10 mi 2 (5.44 km2). 
WATER-DISCHARGE RECORDS 
PERIOD OF RECORD.--January 1963 to December 1968. Monthly measurements, 1962, 69. October 1982 to current year. 
GAGE.--Water-stage recorder, crest-stage gage and sharp-crested concrete control. Elevation of gage is 140 ft 
(43 m), from topographic map. 
REMARKS.--Estimated daily discharges: Nov. 26 to Dec. 10. Records poor. 
AVERAGE DISCHARGE.--9 years (1964-68, 1983-86), 0.107 ft'/s (0.003 m/'s), 0.69 in/yr (17.5 mm/yr). 77.5 acre-ft/yr 
(0.10 he/yr). 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 288 ft'is (8.156 m'/s), Nov. 7, 1984, gage height, 3.62 ft 
(1.103 m); no flow many days each year. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 25 ft'is (0.71 m 3/s) and maximum (*): 
Discharge 
Gage height 
Discharge 
Gage height 
Date 
Time (ft'/s) (20/s) 
(ft) (m) 
Date Time (W/s) (e/s) 
(ft) (m) 
Oct. 6 
1730 
*118 
3.34 
*2.81 0.856 
Nov. 12 
1800 
46 
1.30 
2.26 0.689 
No flow many days. 
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
MEAN 
VALUES 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
.00 
.99 
1.1 
.49 
.28 
.14 
.06 
.08 
.19 
.11 
.07 
.01 
2 
.00 
1.4 
1.1 
.47 
.26 
.14 
.06 
.08 
.20 
.11 
.05 
.01 
3 
.00 
1.3 
1.0 
.45 
.26 
.14 
.06 
.08 
.20 
.11 
.05 
.01 
4 
.00 
1.5 
1.0 
.44 
.26 
.13 
.07 
.08 
.20 
.11 
.06 
.00 
5 
.00 
1.5 
.95 
.44 
.26 
.13 
.18 
.08 
.20 
.11 
.16 
.00 
6 
8.2 
1.5 
.90 
.44 
.25 
.13 
.13 
.10 
.20 
.11 
.18 
.00 
7 
3.9 
1.3 
.90 
.43 
.23 
.13 
.09 
.09 
.20 
.11 
.15 
.00 
8 
1.2 
1.2 
.86 
.41 
.22 
.13 
.09 
.09 
.20 
.10 
.04 
.00 
9 
.54 
1.2 
.86 
.67 
.22 
.13 
.09 
.08 
.20 
.10 
.02 
.00 
10 
.51 
1.2 
.78 
.52 
.22 
.13 
.09 
.20 
.19 
.1C 
.02 
.00 
11 
.49 
1.2 
.71 
.49 
.21 
.13 
.08 
.27 
.18 
.10 
.03 
.00 
12 
.49 
5.6 
.76 
.46 
.20 
.13 
.08 
.16 
.48 
.10 
.03 
.00 
13 
.41 
3.7 
.68 
.45 
.19 
.13 
.08 
.14 
1.1 
.10 
.03 
.00 
14 
.33 
2.7 
.64 
.43 
.18 
.13 
.08 
.14 
.98 
.10 
.06 
.00 
15 
.33 
2.5 
.64 
.41 
.18 
.13 
.08 
.13 
.74 
.0,
..' 
.02 
.00 
16 
.33 
2.4 
.66 
.41 
.19 
.12 
.08 
.14 
.15 
.09 
.02 
.00 
17 
.39 
2.6 
.61 
.41 
.19 
.10 
.08 
.15 
.18 
.09 
.02 
.00 
18 
.40 
2.5 
.62 
.42 
.18 
.10 
.08 
.18 
.11 
.09 
.02 
.00 
19 
.38 
2.2 
.62 
.41 
.16 
.10 
.08 
.18 
.11 
.09 
.01 
.00 
20 
.37 
2.4 
.62 
.40 
.16 
.10 
.08 
.18 
.11 
.09 
.01 
.00 
21 
.37 
2.3 
.61 
.39 
.16 
.10 
.07 
.18 
.11 
.08 
.01 
.00 
22 
.37 
1.9 
.63 
.38 
.16 
.10 
.07 
.18 
.11 
.08 
.00 
.00 
23 
.41 
1.8 
.61 
.37 
.14 
.09 
.06 
.18 
.11 
.07 
.00 
.00 
24 
.42 
1.7 
.60 
.36 
.14 
.09 
.06 
.18 
.11 
.07 
.00 
.04 
25 
.48 
1.5 
.57 
.34 
.14 
.09 
.06 
.19 
.11 
.08 
.00 
.07 
26 
.54 
1.5 
.57 
.32 
.14 
.09 
.06 
.20 
.11 
.08 
.00 
.03 
27 
.52 
1.4 
.56 
.31 
.14 
.09 
.06 
.20 
.11 
.08 
.00 
.00 
28 
.67 
1.4 
.55 
.31 
.14 
.09 
.08 
.27 
.11 
.08 
.01 
.00 
29 
1.7 
1.2 
.54 
.31 
--- 
.07 
.07 
.20 
.11 
.07 
.02 
.00 
30 
1.2 
1.2 
.51 
.30 
.07 
.08 
.19 
.11 
.07 
.01 
.00 
31 
1.0 
--- 
.49 
.29 
.06 
--- 
.18 
--- 
.06 
.03 
--- 
TOTAL 
25.95 
56.79 
22.25 
12.73 
5.46 
3.44 
2.39 
4.78 
7.22 
2.83 
1.13 
.17 
MEAN 
.84 
1.89 
.72 
.41 
.19 
.11 
.08 
.15 
.24 
.0.) 
.04 
.01 
MAX 
8.2 
5.6 
1.1 
.67 
.28 
.14 
.18 
.27 
1.1 
.11 
.18 
.07 
MIN 
.00 
.99 
.49 
.29 
.14 
.06 
.06 
.08 
.11 
.06 
.00 
.00 
CFSM 
.40 
.90 
.34 
.20 
.09 
.05 
.04 
.07 
.11 
.04 
.02 
.00 
IN. 
.46 
1.01 
.39 
.23 
.10 
.06 
.04 
.08 
.13 
.05 
.02 
.00 
AC-FT 
51 
113 
44 
25 
11 
6.8 
4.7 
9.5 
14 
5.5 
2.2 
.3 
CAL YR 1985 TOTAL 132.68 
MEAN 
.36 
MAX 
8.2 
MIN 
.00 
CFSM 
.17 
IN. 
2.35 
AC-FT 
263 
WTR YR 1986 TOTAL 145.14 
MEAN 
.40 
MAX 
8.2 
MIN 
.00 
CFSM 
.19 
IN. 
2.57 
AC-FT 
288 
340 
Ground-Water Records 
for 
U.S. Virgin Islands 
 
 
 
 
 
 
 
  
 
 
  
  
  
GROUND-WATER LEVELS 
ST. CROIX, U.S. VIRGIN ISLANDS 
174225064471900. Local number, 1. 
LOCATION.--Lat 17°42'25", long 64°47'19". 
Owner: Virgin Islands Government. 
Name: Fairplains 6 (FP6). 
AQUIFER.--Alluvium and marl. 
WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). 
DATUM.--Elevation of land-surface datum is about 20 ft (6.10 m) above mean sea level, from topographic map. 
Measuring point: Top of pump concrete base, 2.20 ft (0.67 m) above land-surface datum. 
REMARKS,--Observation well. Water levels affected by pumping. 
PERIOD OF RECORD.--March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 15.64 ft (4.77 m) below land-surface datum, Mar. 25, 
1982; lowest water level measured, a58.57 ft (17.9 m) below land-surface datum, June 20, 1983. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Dec. 10 
a58.03 
Feb. 24 
17.38 
Apr. 29 
17.37 
June 30 
16.10 
a Pumping. 
343 
   
 
 
344 
GROUND-WATER LEVELS 
ST. CROIX, U.S. VIRGIN ISLANDS 
174225064472000. Local number, 2. 
LOCATION.--Lat 17°42'25", long 64°47'20". 
Owner: U.S. Government, Virgin Islands Government. 
Name: USGS-10, Fairplains 2 (FP2). 
AQUIFER.--Alluvium and marl. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), caed 6 in (0.15 m). 
DATUM.--Elevation of land-surface datum is about 20 ft (6.10 m) above mean sea level, from topographic map. 
Measuring point: Top of 0.5 in (0.01 m) hole at concrete base wall, 3.00 ft (0.91 m) above land-surface datum. 
REMARKS.--Recording observation well. Nearby pumping well. 
PERIOD OF RECORD.--June 1983 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 20.91 ft (6.37 m) below land-surface datum, Nov. 27, 
29, 1985; lowest water level recorded, 25.02 ft (7.63 m) below land-surface datum, Aug. 22, 1984. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
23.31 
21.87 
21.45 
21.70 
21.95 
22.43 
22.10 
22.14 
21.81 
21.77 
22.08 
22.33 
2 
23.30 
21.85 
21.54 
21.74 
21.96 
22.46 
22.11 
22.20 
21.79 
21.75 
22.06 
22.29 
3 
23.26 
21.81 
21.61 
21.77 
21.98 
22.40 
22.10 
22.23 
21.82 
21.81 
22.05 
22.36 
4 
23.24 
21.72 
21.65 
21.81 
21.94 
22.37 
22.07 
22.21 
21.81 
21.81 
22.09 
22.64 
5 
23.16 
21.65 
21.69 
21.85 
21.91 
22.42 
22.07 
22.22 
21.84 
21.73 
22.09 
22.83 
6 
23.01 
21.61 
21.72 
21.87 
21.90 
22.44 
22.02 
22.23 
21.84 
21.69 
22.18 
22.96 
7 
22.92 
21.54 
21.76 
21.81 
21.90 
22.48 
22.03 
22.22 
21.84 
21.68 
22.12 
23.02 
8 
22.78 
21.49 
21.75 
21.88 
21.89 
22.51 
22.01 
22.23 
21.84 
21.71 
22.10 
23.10 
9 
22.72 
21.52 
21.76 
21.94 
21.88 
22.51 
21.94 
22.20 
21.85 
21.68 
22.17 
23.20 
10 
22.74 
21.52 
21.88 
21.83 
21.89 
22.41 
21.91 
22.17 
21.83 
21.70 
22.19 
23.28 
11 
22.72 
21.51 
22.04 
21.76 
21.93 
22.37 
21.90 
22.13 
21.80 
21.75 
22.14 
23.34 
12 
22.69 
21.51 
22.10 
21.79 
21.93 
22.42 
21.91 
22.07 
21.78 
21.81 
22.07 
23.43 
13 
22.58 
21.41 
21.96 
21.75 
21.90 
22.45 
21.90 
22.00 
21.77 
21.85 
22.10 
23.50 
14 
22.49 
21.30 
21.60 
21.74 
21.91 
22.47 
21.95 
22.00 
21.77 
21.86 
22.11 
23.35 
15 
22.39 
21.23 
21.50 
21.76 
21.90 
22.53 
21.92 
21.95 
21.77 
21.79 
22.09 
23.41 
16 
22.43 
21.17 
21.44 
21.73 
22.00 
22.49 
21.92 
21.94 
21.79 
21.77 
22.08 
23.47 
17 
22.45 
21.15 
21.42 
21.71 
22.05 
22.40 
21.93 
21.93 
21.79 
21.83 
22.02 
23.58 
18 
22.44 
21.12 
21.39 
21.70 
21.96 
22.35 
21.90 
21.92 
21.80 
21.88 
21.97 
23.64 
19 
22.43 
21.11 
21.47 
21.69 
21.93 
22.32 
21.90 
21.92 
21.85 
21.91 
21.98 
23.63 
20 
22.42 
21.07 
21.55 
21.68 
21.93 
22.33 
21.90 
21.95 
21.89 
21.89 
22.06 
23.67 
21 
22.42 
21.05 
21.58 
21.65 
21.96 
22.29 
21.91 
21.97 
21.86 
21.93 
22.18 
23.69 
22 
22.41 
21.03 
21.62 
21.64 
21.96 
22.27 
21.94 
21.97 
21.88 
21.93 
22.15 
23.70 
23 
22.40 
21.01 
21.65 
21.75 
22.07 
22.23 
21.92 
21.91 
21.91 
21.91 
22.17 
23.73 
24 
22.38 
20.95 
21.69 
21.83 
22.11 
22.21 
21.95 
21.87 
21.88 
22.01 
22.23 
23.74 
25 
22.35 
20.94 
21.71 
21.88 
22.11 
22.18 
22.11 
21.84 
21.87 
22.05 
22.23 
23.68 
26 
22.34 
20.94 
21.74 
21.88 
22.19 
22.10 
22.16 
21.81 
21.85 
22.04 
22.25 
23.82 
27 
22.32 
20.93 
21.73 
21.82 
22.27 
22.12 
22.23 
21.79 
21.86 
22.00 
22.40 
23.80 
28 
22.30 
21.10 
21.69 
21.79 
22.36 
22.11 
22.15 
21.78 
21.88 
21.98 
22.35 
23.82 
29 
22.16 
21.12 
21.61 
21.87 
22.11 
22.10 
21.77 
21.81 
21.98 
22.30 
23.85 
30 
22.08 
21.28 
21.55 
21.90 
22.11 
22.14 
21.81 
21.80 
22.06 
22.31 
23.87 
31 
21.96 
21.64 
21.92 
22.11 
21.82 
22.11 
22.30 
LOW 
23.31 
21.87 
22.10 
21.94 
22.36 
22.53 
22.23 
22.23 
21.91 
22.11 
22.40 
23.87 
HIGH 
21.96 
20.93 
21.39 
21.64 
21.88 
22.10 
21.90 
21.77 
21.77 
21.68 
21.97 
22.29 
WTR YR 1986 
MEAN 22.1 
LOW 23.87 
HIGH 20.93 
9 
20 
La 
aIR 
14:1 
22 
za 
>I) 24 
crz 
4 26 
ONDJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 
1983 1984 
1985 
1986 
 
 
 
 
 
 
 
 
345 
GROUND-WATER LEVELS 
ST. CROIX, U.S. VIRGIN ISLANDS 
174243064475100. Local number, 3. 
LOCATION.--Lat 17°42'43", long 64°47'51". 
Owner: U.S. Government, Virgin Islands Government. 
Name: Golden Grove-6 (PW6). 
AQUIFER.--Alluvium and marl. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 8 in (0.20 m), cased 8 in (0.20 m). 
DATUM.--Elevation of land-surface datum is about 40 ft (12.2 m) above mean sea level, from topographic map. 
Measuring point: Upper edge of hole at 8 in (0.20 m) casing, 4.20 ft (1.28 m) above land-surface datum. 
REMARKS.--Recording observation well. 
PERIOD OF RECORD.--March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 14.76 ft (4.50 m) below land-surface datum, Mar. 25, 
1982; lowest water level recorded, 28.67 ft (8.74 m) below land-surface datum, Oct. 6, 1985. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
28.62 
22.44 
21.03 
23.37 
24.65 
25.39 
26.11 
26.75 
25.91 
26.68 
27.27 
27.79 
2 
28.63 
22.15 
21.18 
23.42 
24.66 
25.41 
26.15 
26.77 
25.93 
26.71 
27.29 
27.80 
3 
28.64 
21.98 
21.29 
23.47 
24.67 
25.45 
26.18 
26.79 
25.95 
26.74 
27.30 
27.81 
4 
28.65 
21.90 
21.40 
23.54 
24.72 
25.47 
26.20 
26.81 
25.96 
26.76 
27.30 
27.82 
5 
28.66 
21.90 
21.48 
23.60 
24.76 
25.50 
26.21 
26.83 
25.99 
26.78 
27.33 
27.83 
6 
28.67 
21.92 
21.56 
23.64 
24.79 
25.52 
26.22 
26.85 
26.02 
26.80 
27.35 
27.84 
7 
28.52 
21.95 
21.67 
23.69 
24.81 
25.55 
26.23 
26.86 
26.04 
26.82 
27.36 
27.86 
8 
27.96 
22.03' 
21.79 
23.74 
24.84 
25.58 
26.25 
26.87 
26.05 
26.84 
27.38 
27.87 
9 
27.34 
22.12 
21.86 
23.81 
24.87 
25.61 
26.27 
26.89 
26.09 
26.86 
27.39 
27.88 
10 
26.96 
22.18 
21.95 
23.84 
24.91 
25.63 
26.29 
26.92 
26.13 
26.87 
27.42 
27.89 
11 
26.71 
22.25 
22.02 
23.87 
24.94 
25.64 
26.31 
26.93 
26.16 
26.89 
27.44 
27.90 
12 
26.54 
22.36 
22.14 
23.90 
24.96 
25.66 
26.32 
26.81 
26.19 
26.91 
27.46 
27.91 
13 
26.39 
21.98 
22.22 
23.93 
24.98 
25.67 
26.33 
26.39 
26.21 
26.93 
27.47 
27.93 
14 
26.30 
20.90 
22.28 
23.99 
25.01 
25.68 
26.37 
26.08 
26.22 
26.95 
27.49 
27.94 
15 
26.25 
20.32 
22.34 
24.07 
25.03 
25.69 
26.40 
25.89 
26.25 
26.96 
27.50 
27.95 
16 
26.20 
20.10 
22.43 
24.07 
25.06 
25.70 
26.43 
25.73 
26.28 
26.97 
27.52 
27.96 
17 
26.16 
20.05 
22.50 
24.10 
25.09 
25.72 
26.47 
25.67 
26.30 
26.98 
27.54 
27.97 
18 
26.12 
19.85 
22.56 
24.14 
25.11 
25.74 
26.49 
25.61 
26.32 
27.00 
27.56 
27.99 
19 
26.10 
19.68 
22.63 
24.19 
25.14 
25.76 
26.50 
25.56 
26.35 
27.01 
27.57 
28.01 
20 
26.10 
19.65' 
22.69 
24.22 
25.16 
25.80 
26.52 
25.55 
26.40 
27.04 
27.58 
28.03 
21 
26.09 
19.73 
22.73 
24.24 
25.18 
25.82 
26.55 
25.55 
26.43 
27.06 
27.58 
28.05 
22 
26.12 
19.83 
22.80 
24.27 
25.20 
25.87 
26.56 
25.57 
26.47 
27.06 
27.59 
28.07 
23 
26.15 
19.93 
22.87 
24.31 
25.25 
25.91 
26.58 
25.60 
26.49 
27.11 
27.61 
28.08 
24 
26.18 
20.05 
22.94 
24.35 
25.29 
25.93 
26.59 
25.64 
26.51 
27.13 
27.62 
28.09 
25 
26.20 
20.18 
22.99 
24.39 
25.30 
25.95 
26.60 
25.67 
26.54 
27.15 
27.65 
28.11 
26 
26.09 
20.35 
23.05 
24.43 
25.32 
25.96 
26.62 
25.69 
26.56 
27.17 
27.67 
28.12 
27 
25.86 
20.51 
23.11 
24.48 
25.34 
25.98 
26.65 
25.73 
26.58 
27.19 
27.69 
28.14 
28 
25.69 
20.66 
23.15 
24.52 
25.38 
26.01 
26.68 
25.77 
26.59 
27.20 
27.71 
28.16 
29 
25.20 
20.78 
23.20 
24.54 
26.04 
26.70 
25.80 
26.61 
27.22 
27.74 
28.17 
30 
24.12 
20.90 
23.26 
24.59 
26.06 
26.73 
25.84 
26.65 
27.24 
27.76 
28.19 
31 
23.14 
23.30 
24.61 
26.09 
25.88 
27.25 
27.77 
LOW 
28.67 
22.44 
23.30 
24.61 
25.38 
26.09 
26.73 
26.93 
26.65 
27.25 
27.77 
28.19 
HIGH 
23.14 
19.65 
21.03 
23.37 
24.65 
25.39 
26.11 
25.55 
25.91 
26.68 
27.27 
27.79 
WTR YR 1986 
MEAN 25.5 
LOW 28.67 
HIGH 19.65 
• 
17 
Lchj 
• 
20 
z 
23 
_Jcg 
> 
• 
26 
tzz 
29 ONDJ FMAMJJ ASONDJFMAMJJ ASONDJFMAMJJ AS 
1983 1984 
1985 
1986 
 
 
 
       
 
  
    
 
 
   
 
  
GROUND-WATER LEVELS 
ST. CROIX, U.S. VIRGIN ISLANDS 
174245064475800. Local number, 4. 
LOCATION.--Lat 17°42'45", long 64°47'58". 
Owner: Virgin Islands Government. 
Name: Golden Grove - 1 (PW1). 
AQUIFER.--Alluvium and marl. 
WELL CHARACTERISTICS.--Drilled production water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m), 
0-104 ft (0-31.70 m), perforated 64-104 ft (19.51-31.70 m). Depth 104 ft (31.70). 
DATUM.--Elevation of land-surface datum is about 40 ft (12.2 m) above mean sea level, from topographic map. 
Measuring point: Lower edge of 1 in. (0.02 m) pipe at pump base, 3.40 ft (1.04 m) above land-surface datum. 
REMARKS.--Observation well. Water levels affected by pumping. 
PERIOD OF RECORD.--January 1983 to current year. 
EXTREMES FOR PERIOD OF RECORD: Highest water level measured, 23.09 ft (7.04 m) below land-surface datum, May 18, 
1983; lowest water level measured, a58.30 ft (17.77 m) below land-surface datum, September 27, 1983. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Dec. 10 
a45.05 
Feb. 25 
27.12 
Apr. 29 
a 48.03 
June 30 
a56.03 
174336064523200. Local number, 5. 
LOCATION.--Lat 17°43'36", long 64°52'32". 
Owner: Virgin Islands Government. 
Name: Mahogany Road 3. 
AQUIFER.--Alluvium of Quaternary age and volcanic rocks of Cretaceous age. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m), 
0-104 ft (0-31.70 m), perforated 64-104 ft (19.51-31.70 m). Depth 104 ft (31.70 m). 
DATUM.--Elevation of land-surface datum is 70 ft (21.3 m) above mean sea level, from topographic map. 
Measuring point: Lower edge of 2 in. (0.05 m) pipe at pump base, 3.70 ft (1.13 m) above land-surface datum. 
Prior to December 1969, top of instrument platform, 2.57 ft (0.78 m) above land-surface datum. 
REMARKS.--Observation well. Water levels affected by nearby pumpage. 
PERIOD OF RECORD.--May 1964 to December 1969, discontinued. March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 26.24 ft (8.00 m) below land-surface datum, Dec. 16, 
1969; lowest water level measured, 74.31 ft (22.6 m) below land-surface datum, Mar. 29, 1965. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Date 
level 
Date 
level 
Dec. 10 
38.16 
Feb. 25 
42.79 
a Pumping. 
346 
 
 
         
   
 
347 
GROUND-WATER LEVELS 
ST. CROIX, U.S. VIRGIN ISLANDS 
174303064484400. Local number, 6. 
LOCATION.--Lat 17°43'03", long 64°48'44". 
Owner: U.S. Government, Virgin Islands Government 
Name: Adventure 28. 
AQUIFER.--Alluvium of Pleistocene age and marl of Oligocene age. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 4 in (0.10 m), cased 4 in (0.10 m). Depth 97 ft 
(29.6 m) 
DATUM.--Elevation of land-surface datum is about 80 ft (24.39 m) above mean sea level, from topographic map. 
Measuring point: Upper edge of hole at 4 in (0.10 m) casing, 2.00 ft (0.61 m) above land-surface datum. Prior 
June 20, 1983, top of 4 in (0.10 m) casing, 0.90 ft (0.27 m) above land-surface datum. 
REMARKS.--Recording observation well. 
PERIOD OF RECORD.--August 1973 to March 1974, discontinued. March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 24.90 ft (7.59 m) below land-surface datum, Mar. 25, 
1982; lowest water level recorded, 40.18 ft (12.25 m) below land-surface datum, Aug. 5, 1984. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
39.95 
35.83 
33.55 
34.66 
34.98 
35.44 
35.74 
35.82 
34.70 
35.65 
36.55 
37.11 
2 
39.95 
35.50 
33.59 
34.66 
34.99 
35.45 
35.74 
35.83 
34.73 
35.68 
36.58 
37.09 
3 
39.95 
35.24 
33.66 
34.69 
34.98 
35.47 
35.75 
35.86 
34.73 
35.72 
36.61 
37.08 
4 
39.95 
35.00 
33.69 
34.71 
34.99 
35.49 
35.75 
35.88 
34.75 
35.75 
36.63 
37.08 
5 
39.95 
34.81 
33.72 
34.75 
35.01 
35.52 
35.76 
35.91 
34.79 
35.78 
36.66 
37.08 
6 
39.95 
34.65 
33.75 
34.79 
35.03 
35.52 
35.76 
35.93 
34.83 
35.81 
36.69 
37.08 
7 
39.95 
34.54 
33.81 
34.80 
35.05 
35.53 
35.74 
35.95 
34.86 
35.83 
36.70 
37.12 
8 
39.96 
34.47 
33.85 
34.83 
35.07 
35.55 
35.71 
35.95 
34.89 
35.86 
36.72 
37.15 
9 
39.31 
34.45 
33.91 
34.L6 
35.09 
35.57 
35.69 
35.95 
34.93 
35.89 
36.75 
37.18 
10 
38.95 
34.47 
33.95 
34.82 
35.11 
35.58 
35.67 
35.96 
34.98 
35.93 
36.78 
37.20 
11 
38.70 
34.50 
33.99 
34.80 
35.14 
35.58 
35.65 
35.96 
35.01 
35.95 
36.80 
37.23 
12 
38.50 
34.53 
34.05 
34.79 
35.16 
35.59 
35.64 
35.95 
35.02 
35.98 
36.82 
37.25 
13 
38.37 
34.43 
34.09 
34.78 
35.17 
35.59 
35.63 
35.51 
35.04 
36.01 
36.84 
37.29 
14 
38.29 
34.20 
34.14 
34.78 
35.19 
35.59 
35.60 
35.22 
35.07 
36.03 
36.85 
37.33 
15 
38.25 
33.87 
34.18 
34.79 
35.21 
35.60 
35.60 
35.01 
35.10 
36.06 
36.87 
37.36 
16 
38.23 
33.62 
34.22 
34.79 
35.23 
35.60 
35.60 
34.88 
35.13 
36.09 
36.89 
37.40 
17 
38.23 
33.52 
34.26 
34.80 
35.25 
35.62 
35.60 
34.80 
35.17 
36.12 
36.92 
37.42 
18 
38.23 
33.44 
34.28 
34.81 
35.25 
35.63 
35.60 
34.75 
35.21 
36.15 
36.96 
37.45 
19 
38.23 
33.38 
34.30 
34.82 
35.27 
35.64 
35.60 
34.71 
35.24 
36.18 
36.99 
37.47 
20 
38.23 
33.29 
34.32 
34.85 
35.28 
35.65 
35.60 
34.70 
35.29 
36.20 
37.02 
37.50 
21 
38.23 
33.26 
34.35 
34.85 
35.29 
35.66 
35.62 
34.69 
35.32 
36.23 
37.05 
37.52 
22 
38.24 
33.25 
34.35 
34.88 
35.31 
35.67 
35.65 
34.68 
35.34 
36.27 
37.06 
37.54 
23 
38.24 
33.25 
34.32 
34.88 
35.33 
35.68 
35.67 
34.68 
35.38 
36.30 
37.07 
31.55 
24 
38.24 
33.26 
34.44 
34.88 
35.35 
35.70 
35.69 
34.70 
35.42 
36.33 
37.08 
37.57 
25 
38.10 
33.30 
34.48 
34.89 
35.35 
35.71 
35.72 
34.71 
35.46 
36.36 
37.09 
37.57 
26 
37.78 
33.33 
34.51 
34.88 
35.36 
35.71 
35.74 
34.71 
35.50 
36.39 
37.14 
37.57 
27 
37.50 
33.38 
34.54 
34.89 
35.39 
35.71 
35.77 
34.72 
35.53 
36.42 
37.15 
37.55 
28 
37.24 
33.45 
34.56 
34.91 
35.42 
35.72 
35.77 
34.73 
35.55 
36.43 
37.16 
37.54 
29 
37.04 
33.49 
34.57 
34.93 
35.72 
35.78 
34.70 
35.59 
36.46 
37.16 
37.54 
30 
36.61 
33.52 
34.60 
34.93 
35.73 
35.80 
34.70 
35.63 
36.49 
37.16 
37.54 
31 
36.26 
34.63 
34.96 
35.73 
34.71 
36.52 
37.15 
LOW 
39.96 
35.83 
34.63 
34.96 
35.42 
35.73 
35.80 
35.96 
35.63 
36.52 
37.16 
37.57 
HIGH 
36.26 
33.25 
33.55 
34.66 
34.98 
35.44 
35.60 
34.68 
34.70 
35.65 
36.55 
37.08 
WTR YR 1986 
MEAN 35.7 
LOW 39.96 
HIGH 33.25 
26 
30 
34 
38 
42 ONDJFMAMJJ ASONDJ FM AM J J ASONDJFMAMjJ AS
1983 1984 
1985 
1986 
 
 
 
 
       
 
  
  
  
 
 
 
 
       
 
  
  
  
GROUND-WATER LEVELS 
ST. CROIX, U.S. VIRGIN ISLANDS 
174525064460600. Local number, 7. 
LOCATION.--Lat 17°45'25", long 64°46'06". 
Owner: Virgin Islands Government. 
Name: Concordia 14. 
AQUIFER.--Sand and gravel. 
WELL CHARACTERISTICS.--Drilled production water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). 
Depth 85 ft (25.91 m). 
DATUM.--Elevation of land-surface datum is about 40 ft (12.2 m) above mean sea level, from topographic map. 
Measuring point: Top of 0.50 in (0.01 m) pipe on top of pump concrete base, 2.30 ft (0.70 m) above 
land-surface datum. 
REMARKS.--Observation well. Water levels affected by pumpage. 
PERIOD OF RECORD.--March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 15.56 ft (4.74 m) below land-surface datum, Nov. 13, 
1984; lowest water level measured, 41.75 ft (12.73 m) below land-surface datum, Feb. 24, 1983. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Dec. 10 
18.05 
Feb. 24 
21.05 
Apr. 29 
23.15 
June 30 
22.01 
174527064460100. Local number, 8. 
LOCATION.--Lat 17°45'27", long 64°46'01" 
Owner: Virgin Islands Government. 
Name: Concordia 1 (Main pump house). 
AQUIFER.--Limestone of Tertiary Age. 
WELL CHARACTERISTICS.--Drilled production water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). 
Depth 82 ft (25.0 m). 
DATUM.--Elevation of land-surface datum is about 40 ft (12.2 m) above mean sea level, from topographic map. 
Measuring point: Top of 6 in (0.15 m) casing, 2.20 ft (0.67 m) above land-surface datum. 
REMARKS.--Observation well. Water levels affected by pumpage. 
PERIOD OF RECORD.--March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 16.68 ft (5.08 m) below land-surface datum, Nov. 13, 
1984; lowest water level measured, a28.39 ft (a8.66 m) below land-surface datum, Dec. 8, 1982. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Dec. 10 
19.17 
Feb. 24 
21.60 
Apr. 29 
23.17 
June 30 
22.30 
a Pumping. 
348 
 
 
 
 
 
  
  
 
 
  
  
  
 
 
 
 
 
  
 
 
 
 
  
  
  
GROUND-WATER LEVELS 
ST. CROIX, U.S. VIRGIN ISLANDS 
174532064460300. Local number, 9. 
LOCATION.--Lat 17°45'32", long 64°46'03". 
Owner: Virgin Islands Government. 
Name: Concordia 7. 
AQUIFER.--Limestone of Tertiary Age. 
WELL CHARACTERISTICS.--Drilled production water-table well, diameter 6 in (0.15 m), cased 0-81 ft (0-24.7 m). 
Depth 81 ft (24.7 m). 
DATUM.--Elevation of land-surface datum is 35 ft (10.7 m) above mean sea level, from topographic map. 
Measuring point: Hole in pump base, 2.20 ft (0.67 m) above land-surface datum. Previous to Mar. 25, 1982, 
hole in pump base 2.50 ft (0.76 m) above land-surface datum. 
REMARKS.--Observation well. Water levels affected by pumping. 
PERIOD OF RECORD.--June 1962 to October 1968, discontinued. March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 1.75 ft (0.53 m) below land-surface datum, May 11, 
1966; lowest water level measured, 57.40 ft (17.5 m) below land-surface datum, Mar. 5, 1964. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Dec. 10 
a21.59 
Feb. 24 
8.01 
Apr. 29 
9.43 
June 30 
8.70 
174329064454700. Local number, 10. 
LOCATION.--Lat 17°43'29", long 64°45'47". 
Owner: Virgin Islands Government. 
Name: Barren Spot 5 (PWD-5). 
AQUIFER.--Alluvium and marl. 
WELL CHARACTERISTICS.--Drilled produc,ion water-table well, diameter 6 in (0.15 m), cased 0-130 ft (0-39.63 m), 
perforated 71-130 ft (21.64-39.53 m). Depth 130 ft (39.63 m). 
DATUM.--Elevation of land-surface datum is about 75 ft (22.86 m) above mean sea level, from topographic map. 
Measuring point: Hole on top of pump base, 2.00 ft (0.61 m) above land-surface datum. 
REMARKS.--Observation well. Water levels affected by pumping. 
PERIOD OF RECORD.--March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 61.86 ft (18.86 m) below land-surface datum, Mar. 26, 
1982; lowest water level measured, a75.52 ft (a23.02 m) below land-surface datum, Sept. 8, 1982. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Dec. 10 
a69.46 
Feb. 24 
65.13 
Apr. 29 
64.86 
June 30 
64.14 
a Pumping. 
349 
I
I
 
 
 
       
 
  
  
 
 
 
 
 
 
 
       
 
  
  
 
 
 
 
 
 
       
 
  
  
 
 
 
GROUND-WATER LEVELS 
ST. THOMAS, U.S. VIRGIN ISLANDS 
182050064580400. Local number, 1. 
LOCATION.--Lat 18°20'50", long 64°58'04". 
Owner: U.S. Government, Virgin Islands Government. 
Name: USGS-8 (Family well - Thatch Farm). 
AQUIFER.--Volcanic rocks of Cretaceous age. 
WELL CHARACTERISTICS.--Drilled water-table production well, diameter 6 in (0.15 a), cased 6 in (0.15 m) 0-25 ft 
(0-7.62 m), open hole 25-80 ft (7.62-24.4 m). Depth 80 ft (24.4 ). 
DATUM.--Elevation of land-surface datum is 80 ft (24.4 m) above mean sea level, from topographic map. 
Measuring point: Top of 6 in (0.15 m) casing, 2.50 ft (0.76 m) above land-surface datum. Prior to Mar. 23, 
1982, top of 6 in (0.15 m) casing, 1.30 ft (0.40 m) above land-surface datum. 
REMARKS.--Non-potable public-water supply and observation well. 
PERIOD OF RECORD.--October 1963 to August 1969, discontinued. March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 2.33 ft (0.71 ) below land-surface datum, Nov. 20, 
1984; lowest water level measured, 56.44 ft (17.21 m) below land-surface datum, Aug. 24, 1984. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Dec. 11 
a7.52 
Feb. 26 
a24.72 
Apr. 30 
a38.10 
July 
1 
a30.79 
182138064543100. Local number, 2. 
LOCATION.--Lat 18°21'38", long 64°54'31". 
Owner: Mahogany Run Resort. 
Name: Mahogany 15. 
AQUIFER.--Fractured rocks. 
WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). 
Depth 145 ft (44.21 m). 
DATUM.--Elevation of land-surface datum is 120 ft (36.6 m) above mean sea level, from topographic map. 
Measuring point: Top of 6 in (0.15 m) casing, 1.20 ft (0.36 m) below land-surface datum. 
REMARKS.--Observation well. Water levels affected by nearby pumping well. 
PERIOD OF RECORD.--March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 12.45 ft (3.79 m) below land-surface datum, July 
1986; lowest water level measured, 88.62 ft (27.01 m) below land-surface datum, Oct. 4, 1984. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Dec. 11 
a14.64 
Feb. 26 
26.52 
Apr. 30 
35.50 
July 
1 
12.45 
182138064542500. Local number, 3. 
LOCATION.--Lat 18°21'38", long 64°54'25". 
Owner: Mahogany Run Resort. 
Name: Mahogany 16. 
AQUIFER.--Fractured rocks. 
WELL CHARACTERISTICS.--Drilled water-table production well, diameter 6 in (0.15 m), cased 6 in (0.15 m). 
Depth 145 ft (44.21 m). 
DATUM.--Elevation of land-surface datum is 130 ft (39.6 m) above mean sea level, from topographic map. 
Measuring point: Top of 6 in (0.15 m) casing, 1.30 ft (0.40 m) below land-surface datum. 
REMARKS.--Water levels affected by nearby pumping well. 
PERIOD OF RECORD.--March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 17.52 ft (5.34 m) below land-surface datum, July 1, 
1986; lowest water level measured, a103.85 ft (31.65 m) below land-surface datum, Oct. 4, 1984. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Dec. 11 
17.74 
Feb. 26 
47.02 
Apr. 30 
39.62 
July 
1 
17.52 
a Pumping. 
350 
 
 
 
 
  
  
 
  
  
 
 
 
 
 
 
  
  
  
 
 
  
  
 
 
 
GROUND-WATER LEVELS 
ST. THOMAS, U.S. VIRGIN ISLANDS 
182136064541900. Local number, 4. 
LOCATION.--Lat 18°21'3.6", long 64°54'19". 
Owner: Mahogany Run Resort 
Name: Mahogany 17. 
AQUIFER.--Fractured rock. 
WELL CHARACTERISTICS.--Drilled water-table production well, diameter 6 in (0.15 m), cased 6 in (0.15 m). 
Depth 145 ft (44.21 m). 
DATUM.--Elevation of land-surface datum is 140 ft (42.7 m) above mean sea level, from topographic map. 
Measuring point: Top of 6 in (0.15 m) casing at land-surface datum. 
REMARKS.--Public water supply. Water levels affected by nearby pumping well. 
PERIOD OF RECORD.--March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 17.49 ft (5.33 m) below land-surface datum, Dec. 11 
1985; lowest water level measured, a60.40 ft (18.41 m) below land-surface datum, Sept. 10, 1982. 
Date 
Dec. 11 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
level 
Date 
level 
Date 
level 
Date 
level 
17.49 
Feb. 26 
33.38 
Apr. 30 
37.55 
July 
1 
18.62 
182029064535200. Local number, 5. 
LOCATION.--Lat 18°20'29", long 64°53'52". 
Owner: Virgin Islands Government, V.I. Housing Authority. 
Name: Donoe 3. 
AQUIFER.--Volcanic rock undifferentiated. Fracture at 165 ft (50.3 m), from drilling log. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), cased 0-20 ft (0-6.10 m), open 
hole 20-400 ft (6.10-122 m). Depth 400 ft (122 m). 
DATUM.--Elevation of land-surface datum is about 235 ft (71.6 m) above mean sea level, from topographic map. 
Measuring point: Top of 6 in (0.15 m) casing, 2.30 ft (0.70 m) above land-surface datum. 
REMARKS.--Observation well. 
PERIOD OF RECORD.--March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 54.24 ft (16.53 m) below land-surface datum, Nov. 20, 
1984; lowest water level measured, 90.98ft (27.73m) below land-surface datum, Apr. 30, 1986. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
Date 
level' 
Date 
level 
Date 
level 
Date 
level 
Dec. 11 
64.69 
Feb. 26 
76.36 
Apr. 30 
90.98 
July 
1 
66.18 
a Pumping. 
351 
   
 
 
 
 
352 
GROUND-WATER LEVELS 
ST. THOMAS, U.S. VIRGIN ISLANDS 
182038064550300. Local number, 6. 
LOCATION.--Lat 18°20'38", long 64°55'03". 
Owner: U.S. Government, Virgin Islands Government. 
Name: Grade School 3. 
AQUIFER.--Volcanic breccia. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), ca,ed 6 in (0.15 m). Depth 70 ft 
(21.3 m). 
DATUM.--Elevation of land-surface datum is about 60 ft (18.3 m) above mean sea level, from topographic map. 
Measuring point: Top of 0.5 in (0.01 m) hole at 6 in (0.15 m) casing, 1.30 ft 0.40 m) ajove land-surface 
datum. Prior to June 27, 1983, top of 6 in (0.15 m) casing, 2.90 ft (0.88 a) above land-surface datum. 
REMARKS.--Recording observation well. 
PERIOD OF RECORD.--March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 3.72 ft (1.13 m) below land-surface datum, May 22, 
1986; 
lowest water level recorded, 35.38 ft (10.79 a) below land-surface datum, July 21, 1982. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1995 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
22.55 
13.65 
13.81 
19.95 
22.42 
23.87 
24.65 
17.05 
4.65 
9.41 
13.95 
17.15 
2 
22.61 
13.27 
14.10 
20.01 
22.48 
23.90 
24.67 
15.79 
4.79 
9.62 
13.96 
17.27 
3 
22.56 
13.24 
14.39 
20.08 
22.54 
23.93 
24.70 
14.59 
4.87 
9.82 
14.01 
17.28 
4 
22.53 
13.42 
14.70 
20.16 
22.60 
23.97 
24.73 
13.08 
5,00 
10.02 
14.08 
17.29 
5 
22.53 
13.68 
15.01 
20.22 
22.68 
24.02 
24.72 
12.23 
5.15 
10.16 
14.15 
17.33 
6 
21.16 
13.58 
15.28 
20.27 
22.77 
24.07 
24.60 
11.87 
5.32 
10.37 
14.23 
17.37 
7 
17.33 
13.32 
15.57 
20.33 
22.87 
24.13 
24.46 
11.84 
5.45 
10.54 
14.33 
17.40 
8 
15.42 
13.23 
15.84 
20.47 
22.99 
24.16 
24.35 
10.92 
5.58 
10.74 
14.51 
17.44 
9 
14.53 
13.39 
16.12 
20.69 
23.10 
24.19 
24.30 
10.11 
5.71 
10.94 
14.69 
17.53 
10 
14.15 
13.67 
16.36 
20.77 
23.20 
24.20 
24.28 
9.97 
5.84 
11.14 
14.87 
17.62 
11 
14.25 
13.99 
16.58 
20.82 
23.24 
24.23 
24.29 
9.31 
5.96 
11.33 
15.04 
17.72 
12 
14.81 
14.33 
16.78 
20.90 
23.29 
24.25 
24.31 
8.16 
6.09 
11.53 
15.21 
17.84 
13 
15.51 
14.35 
16.95 
20.97 
23.32 
24.28 
24.32 
7.91 
6.20 
11.73 
15.38 
17.97 
14 
16.16 
14.03 
17.12 
21.04 
23.35 
24.34 
24.35 
7.10 
6.29 
11.93 
15.44 
18.08 
15 
16.82 
13.78 
17.29 
21.12 
23.38 
24.39 
24.39 
6.30 
6.42 
12.15 
15.50 
18.18 
16 
17.43 
13.20 
17.44 
21.21 
23.41 
24.39 
24.44 
6.11 
6.52 
12.36 
15.58 
18.43 
17 
18.00 
12.26 
17.61 
21.28 
23.44 
24.39 
24.48 
6.12 
6.64 
12.56 
15.70 
18.67 
18 
18.52 
11.49 
17.77 
21.37 
23.44 
24.40 
24.51 
5.94 
6.73 
12.75 
15.82 
18.96 
19 
19.00 
11.12 
17.97 
21.43 
23.44 
24.41 
24.54 
4.46 
6.82 
12.92 
15.96 
19.23 
20 
19.33 
11.04 
18.24 
21.49 
23.44 
24.45 
24.64 
4.20 
6.90 
13.12 
16.12 
19.49 
21 
19.60 
11.15 
18.47 
21.55 
23.46 
24.50 
24.82 
4.11 
7.14 
13.32 
16.25 
19.73 
22 
19.86 
11.34 
18.61 
21.60 
23.47 
24.52 
24.93 
3.84 
7.43 
13.54 
16.39 
19.94 
23 
20.10 
11.58 
18.78 
21.66 
23.52 
24.55 
25.06 
3.78 
7.67 
13.75 
16.51 
20.12 
24 
20.32 
11.85 
18.93 
21.71 
23.59 
24.57 
25.19 
3.86 
7.89 
13.92 
16.63 
20.31 
25 
19.86 
12.16 
19.10 
21.75 
23.68 
24.59 
25.26 
3.94 
8.08 
14.0E 
16.74 
20.48 
26 
18.97 
12.47 
19.25 
21.79 
23.76 
24.61 
25.28 
4.05 
8.28 
14.23 
16.81 
20.64 
27 
18.41 
12.73 
19.40 
21.82 
23.81 
24.62 
25.29 
4.20 
8.52 
14.30 
16.86 
20.77 
28 
17.84 
13.00 
19.52 
21.85 
23.84 
24.64 
25.30 
4.34 
8./5 
14.28 
16.93 
20.89 
29 
17.01 
13.25 
19.64 
21.93 
24.64 
22.93 
4.43 
8.98 
14.21 
16.99 
21.00 
30 
15.84 
13.52 
19.74 
22.17 
24.64 
18.42 
4.57 
9.17 
14.12 
16.93 
21.10 
31 
14.49 
19.85 
22.32 
24.65 
4.69 
14.01 
17.00 
LOW 
22.61 
14.35 
19.85 
22.32 
23.84 
24.65 
25.30 
17.05 
9.17 
14.30 
17.00 
21.10 
HIGH 
14.15 
11.04 
13.81 
19.95 
22.42 
23.87 
18.42 
3.78 
4.65 
9.41 
13.95 
17.15 
WTR YR 1986 
MEAN 16.8 
LOW 25.30 
HIGH 3.78 
to 
20 
A\ 
arZ 
29 ONDJ FMAMJ J ASONDJ FMAMJ J ASONDJ FMAMJ J AS 
1983 1984 
1985 
1986 
 
 
 
 
 
  
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
  
 
 
 
 
 
 
GROUND-WATER LEVELS 
ST. JOHN, U.S. VIRGIN ISLANDS 
182010064472600. Local number, 1. 
LOCATION.--Lat 18°20'10", long 64°47'26". 
Owner: U.S. Government, National Park Services. 
Name: NPS-2 (Cruz Bay). 
AQUIFER.--Volcanic rocks of Cretaceous Age. 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), 4 in (0.10 m) cased, 0-20 ft 
(0-6.10 m), open hole 20-99 ft (6.10-30.2 m). Depth 99 ft (30.2 m). 
DATUM.--Elevation of land-surface datum is 60 ft (18.3 m) above mean sea level, from topographic map. 
Measuring point: Top of 4 in (0.10 m) casing, 4.10 ft (1.25 m) above old land-surface datum after 1.40 ft 
(0.43 m) land fill and 2.70 ft (0.82 m) casing extension occurred. Prior to June 29, 1983, top of 4 in 
(0.10 m) casing, 1.40 ft (0.43 m) above land-surface datum. 
REMARKS.--Observation well. Water levels affected by pumping nearby well. 
PERIOD OF RECORD.--May 1964, discontinued. June 30, 1983 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, +1.41ft (0.43 m) below land-surface datum, May 1, 
1986; lowest water level measured, 42.56 ft (12.98 m) below land-surface datum, Aug. 30, 1967. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Dec. 12 
22.93 
Feb. 27 
33.17 
May 
1 
+1.41 
July 
2 
8.46 
182109064460300. Local number, 2. 
LOCATION.--Lat 18°21'09", long 64°46'03". 
Owner: U.S. Government, National Park Service. 
Name: NPS-5 (Trunk Bay). 
AQUIFER.--Volcanic rocks of CretaceoL: Age. 
WELL CHARACTERISTICS.--Drilled water-table production well, diameter 6 in (0.15 m), cased 0-12 ft (0-3.66 m), 
open hole 12-60 ft (3.66-18.3 m). Depth 60 ft (18.3 m). 
DATUM.--Elevation of land-surface datum is 60 ft (18.3 m) above mean sea level, from topographic map. 
Measuring point: Top of 6 in (0.15 m) casing, 0.70 ft (0.21 m) above land-surface datum. Prior to Mar. 24, 
1982 top of 6 in (0.15 m) casing, 1.00 ft (0.30 m) above land-surface datum. 
REMARKS.--Active water supply well for recreation facilities at Trunk Bay. 
PERIOD OF RECORD.--August 1964 to December 1969, discontinued. March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 12.83 ft (3.91 m) below land-surface datum, Jan. 24, 
1985; lowest water level measured, a57.29 ft (17.47 m) below land-surface datum, Nov. 27, 1968. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Dec. 12 
25.39. 
Feb. 27 
a47.44 
May 
1 
35.50 
July 
2 
14.80 
a Pumping. 
+ Above land-surface datum. 
353 
 
            
 
 
 
••• 
354 
GROUND-WATER LEVELS 
ST. JOHN, U.S. VIRGIN ISLANDS 
182116064451000. Local number, 3. 
LOCATION.--Lat 18'21'16", long 64°45'10". 
Owner: U.S. Government, National Park Service. 
Name: NPS-6 (Cinnamon Bay). 
AQUIFER.--Volcanic rocks of Cretaceous Age. 
WELL CHARACTERISTICS.--Drilled water-table production well, diameter 6-in (0.15 m), cased 0-51 ft (0-15.55 m), open 
hole 51-70 ft (15.55-21.34 m). Depth 70 ft (21.34 m). 
DATUM.--Elevation of land-surface datum is about 60 ft (18.3 m) above mean sea level, from topographic map. 
Measuring point: Hole on 6 in (0.15 m) casing, 2.00 ft (0.61 m) above land-surface datum. Prior to June 29, 
1983, top of 6 in (0.15 m) casing at land-surface datum. 
REMARKS.--Abandoned as production well. Recording observation well. 
PERIOD OF RECORD.--August 1964 to December 1969, discontinued. March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 41.12 ft (12.54 m) below land-surface datum, Aug. 15, 
1969; 
lowest water level recorded, 63.15 ft (19.25 m) below land-surface datum, July 1, 1968. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
57.40 
56.55 
54.33 
56.48 
57.21 
57.34 
56.68 
49.54 
55.14 
56.26 
56.10 
2 
57.41 
56.42 
54.45 
56.50 
57.21 
57.36 
56.45 
49.80 
55.23 
56.30 
56.08 
3 
57.43 
56.32 
54.61 
56.52 
57.21 
57.39 
56.27 
49.99 
55.29 
56.34 
56.08 
4 
57.45 
56.25 
54.75 
56.54 
57.24 
57.40 
56.06 
50.10 
55.35 
56.37 
56.08 
5 
57.47 
56.15 
54.88 
56.56 
57.24 
57.40 
55.83 
50.27 
55.42 
56.40 
56.08 
6 
57.47 
56.11 
54.99 
56.60 
57.23 
57.40 
55.64 
50.53 
55.50 
56.42 
56.08 
7 
57.34 
56.07 
55.08 
56.63 
57.24 
57.39 
55.47 
50.79 
55.55 
56.43 
56.08 
8 
57.26 
56.05 
55.17 
56.67 
57.26 
57.38 
55.25 
51.06 
55.60 
56.43 
56.10 
9 
57.19 
56.03 
55.24 
56.69 
57.27 
57.35 
54.97 
51.32 
55.65 
56.45 
56.13 
10 
57.15 
56.03 
55.30 
56.70 
57.27 
57.32 
54.67 
51.58 
55.72 
56.46 
56.17 
11 
57.14 
56.02 
55.34 
56.69 
57.28 
57.31 
54.42 
51.85 
55.78 
56.46 
56.21 
12 
57.13 
56.05 
55.41 
56.67 
57.28 
57.31 
53.93 
52.11 
55.84 
56.43 
56.24 
13 
57.10 
56.06 
55.48 
56.66 
57.29 
57.31 
53.41 
52.37 
55.87 
56.42 
56.25 
14 
57.07 
55.89 
55.56 
56.66 
57.31 
57.30 
52.81 
52.64 
55.91 
56.39 
56.25 
15 
57.06 
55.57 
55.61 
56.67 
57.33 
57.30 
52.09 
52.90 
55.93 
56.35 
56.25 
16 
57.06 
55.03 
55.66 
56.68 
57.39 
57.31 
51.56 
53.15 
55.95 
56.32 
56.28 
17 
57.06 
54.36 
55.73 
56.69 
57.42 
57.33 
51.29 
53.37 
55.97 
56.31 
56.30 
18 
57.05 
53.72 
55.80 
56.71 
57.47 
57.33 
51.19 
53.55 
56.00 
56.31 
56.32 
19 
57.04 
53.25 
55.86 
56.71 
57.51 
57.33 
50.00 
53.73 
56.03 
56.31 
56.35 
20 
57.04 
53.04 
55.92 
56.71 
57.55 
57.33 
48.90 
53.89 
56.06 
56.33 
56.36 
21 
57.03 
52.99 
56.00 
56.75 
57.57 
57.32 
48.30 
54.04 
56.08 
56.36 
56.36 
22 
57.03 
53.03 
56.05 
56.80 
57.58 
57.29 
47.60 
54.21 
56.11 
56.38 
56.36 
23 
57.03 
53.11 
56.09 
56.83 
57.56 
57.24 
46.49 
54.34 
56.13 
56.35 
56.35 
24 
57.03 
53.22 
56.13 
56.86 
57.53 
57.21 
45.76 
54.46 
56.14 
56.31 
56.37 
25 
57.03 
53.37 
56.19 
56.86 
57.48 
57.19 
45.66 
54.59 
56.14 
56.26 
56.40 
26 
57.01 
53.52 
56.26 
56.89 
57.40 
57.19 
46.12 
54.69 
56.14 
56.21 
56.41 
27 
57.00 
53.71 
56.31 
56.91 
---
57.35 
57.22 
46.83 
54.79 
56.15 
56.18 
56.41 
28 
56.98 
53.84 
56.38 
---
57.22 
57.33 
57.21 
47.49 
54.89 
56.17 
56.18 
56.42 
29 
56.96 
54.01 
56.42 
---
57.31 
57.14 
48.05 
54.98 
56.20 
56.17 
56.43 
30 
56.93 
54.16 
56.44 
57.31 
57.01 
48.70 
55.05 
56.23 
56.15 
56.44 
31 
56.74 
---
56.45 
57.33 
---
49.13 
---
56.24 
56.12 
---
LOW 
57.47 
56.55 
56.45 
57.58 
57.40 
56.68 
55.05 
56.24 
56.46 
56.44 
HIGH 
56.74 
52.99 
54.33 
57.21 
57.01 
45.66 
49.54 
55.14 
56.12 
56.08 
44 
toip 
47
0- 4C 
Lac.).1 50 
z 
.113 53
Lae) 
56 
fez 
59 
ON0.1 FMAMJJ ASONDJ FMAIAJJ ASONDJ FMAMJJ AS 
1983 1984 
1985 
1986 
 
 
 
 
 
 
355 
GROUND-WATER LEVELS 
ST. JOHN, U.S. VIRGIN ISLANDS 
182042066454500. Local number, 5. 
LOCATION.--Lat 18°20'42", long 66°45'45". 
Owner: Virgin Islands Government. 
Name: DPW-6. (Sussanaberg) 
AQUIFER.--Louisenhoj Formation. 
WELL CHARACTERISTICS.--Drilled water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Sounded depth 
70 ft (21.3 m). 
DATUM.--Elevation of land-surface datum is about 640 ft (195 m) above mean sea level, from topographic map. 
Measuring point: Top of 6 in (0.15 m) casing, 1.60 ft (0 49 m) above land-surface datum. Prior to June 28, 
1983, top of 6 in (0.15 m) casing, 1.30 ft (0.40 m) above land-surface datum. 
REMARKS.--Recording observation well. 
PERIOD OF RECORD.--September 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 1.33 ft (0.40 m) below land-surface datum, May 18, 
1986; lowest water level recorded, 22.18 ft (6.94 m) below land-surface datum, Oct. 5, 1985. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
22.72 
8.83 
6.42 
10.42 
13.70 
16.63 
18.54 
15.82 
2.38 
5.22 
9.09 
11.79 
2 
22.73 
8.83 
6.54 
10.53 
13.81 
16.69 
18.60 
15.89 
2.73 
5.29 
9.17 
11.87 
3 
22.75 
8.83 
6.68 
10.63 
13.91 
16.77 
18.64 
11.93 
2.79 
5.33 
9.30 
11.98 
4 
22.77 
11.72 
6.85 
10.74 
14.02 
16.84 
18.69 
12.58 
2.88 
5.51 
9.42 
12.06 
5 
22.78 
11.89 
7.01 
10.85 
14.13 
16.92 
18.72 
13.08 
2.97 
5.60 
9.56 
12.15 
6 
18.80 
11.96 
7.17 
10.95 
14.23 
16.99 
18.76 
13.18 
3.05 
5.71 
9.71 
12.25 
7 
17.39 
12.03 
7.40 
11.06 
14.34 
17.05 
18.82 
10.48 
3.14 
5.83 
9.79 
12.34 
8 
20.63 
12.10 
7.60 
11.16 
14.44 
17.14 
18.87 
7.49 
3.23 
5.99 
9.96 
12.44 
9 
21.06 
12.21 
7.76 
1 1.27 
14.55 
17.23 
18.91 
6.02 
3.31 
6.15 
10.09 
12.55 
10 
20.96 
12.28 
7.89 
11.37 
14.66 
17.29 
18.95 
8.55 
3.40 
6.29 
10.23 
12.65 
11 
20.78 
12.41 
8.05 
11.48 
14.76 
17.36 
19.00 
3.85 
3.49 
6.37 
10.25 
12.73 
12 
20.59 
12.60 
8.20 
11.59 
14.87 
17.42 
19.05 
3.68 
3.58 
6.53 
10.37 
12.82 
13 
20.39 
7.41 
8.29 
11.69 
14.97 
17.47 
19.08 
3.28 
3.66 
6.70 
10.42 
12.96 
14 
20.19 
5.38 
8.45 
11.80 
15.08 
17.54 
19.11 
2.78 
3.75 
6.83 
10.45 
13.06 
15 
20.05 
3.88 
8.57 
11.90 
15.18 
17.60 
19.14 
2.93 
3.84 
6.92 
10.51 
13.17 
16 
19.94 
3.05 
8.76 
12.01 
15.29 
17.66 
19.19 
4.14 
3.92 
7.03 
10.60 
13.29 
17 
19.85 
3.17 
8.82 
12.12 
15.40 
17.71 
19.21 
5.02 
4.01 
7.18 
10.70 
13.38 
18 
19.76 
4.31 
8.93 
12.22 
15.50 
17.77 
19.27 
1.89 
4.10 
7.36 
10.81 
13.52 
19 
19.50 
5.41 
9.05 
12.33 
15.61 
17.84 
19.31 
2.10 
4.18 
7.47 
10.92 
13.64 
20 
19.16 
5.77 
9.15 
12.43 
15.71 
17.90 
19.35 
2.69 
4.27 
7.61 
11.03 
13.76 
21 
18.99 
4.07 
9.26 
12.54 
15.82 
17.94 
19.38 
2.03 
4.36 
7.78 
11.13 
13.86 
22 
18.97 
5.18 
9.36 
12.64 
15.93 
18.02 
19.46 
2.15 
4.44 
8.00 
11.24 
13.94 
23 
19.02 
5.5C 
9.47 
12.75 
16.03 
18.09 
19.51 
2.69 
4.53 
8.05 
11.32 
14.07 
24 
19.08 
5.73 
9.58 
12.86 
16.14 
18.14 
19.55 
2.77 
4.62 
8.10 
11.41 
14.15 
25 
19.10 
5.88 
9.68 
12.96 
16.24 
18.20 
19.60 
2.78 
4.71 
8.22 
11.55 
14.26 
26 
18.93 
5.98 
9.79 
13.07 
16.35 
18.24 
19.65 
2.78 
4.79 
8.38 
11.66 
14.29 
27 
14.09 
6.10 
9.89 
13.17 
16.46 
18.29 
19.69 
2.78 
4.88 
8.51 
11.77 
14.35 
28 
15.28 
6.22 
10.0 
13.28 
16.56 
18.34 
19.71 
2.78 
4.97 
8.67 
11.83 
14.43 
29 
14.04 
6.32 
10.10 
13.39 
18.39 
19.36 
2.76 
5.05 
8.78 
11.85 
14.54 
30 
7.38 
6.39 
10.21 
13.49 
18.45 
13.69 
2.69 
5.14 
8.80 
11.79 
14.63 
31 
7.43 
10.32 
13.60 
18.50 
2.78 
8.95 
11.77 
LOW 
22.78 
12.60 
10.32 
13.60 
16.56 
18.50 
19.71 
15.89 
5.14 
8.95 
11.85 
14.63 
HIGH 
7.38 
3.05 
6.42 
10.42 
13.70 
16.63 
13.69 
1.89 
2.38 
5.22 
9.09 
11.79 
WTR YR 1986 
MEAN 11.6 
LOW 22.78 
HIGH 1.89 
0 
coa 5 
4t 
wo 
10 
(3
Z4 
15 
20 
Wi 25
it 
ONDJFMAMJJ ASONDJFMAMJj ASONDJFMAMJJ AS
1983 1984 
1985 
1986 
 
 
 
 
       
 
  
 
 
 
 
  
 
 
 
 
       
 
  
 
 
 
  
I
 
 
 
       
 
  
 
 
 
  
 
356 
GROUND-WATER LEVELS 
ST. JOHN, U.S. VIRGIN ISLANDS 
182044064454600. Local number, 6. 
LOCATION.--Lat 18°20'44", long 64°45'46". 
Owner: Virgin Islands Government. 
Name: DPW-5 
AQUIFER.--Louisenhoj Formation. 
WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). 
Sounded depth 145 ft (44.2 m). 
DATUM.--Elevation of land-surface datum is about 640 ft (195 m) above mean sea level, from topographic map. 
Measuring point: Top of 6 in (0.15 m) casing, 1.40 ft (0.43 m) above land-surface dattm. 
REMARKS.--Observation well. Water levels affected by pumping. 
PERIOD OF RECORD.--September 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 18.85ft (5.74m) below land-surface datum, July 2, 
1986; lowest water level measured, al07.4 ft (32.7 m) below land-surface datum, Sept. 19, 1985. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Dec. 12 
71.20 
Feb. 27 
44.26 
May 
1 
48.98 
July 
2 
18.85 
182044064454800. Local number, 7. 
LOCATION.--Lat 18°20'44, long 64°45'48". 
Owner: Virgin Islands Government. 
Name: DPW-4 
AQUIFER.--Louisenhoj Formation. 
WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). 
Sounded depth 60 ft (18.3 m). 
DATUM.--Elevation of land-surface datum is about 640 ft (195 m) above mean sea level, from topographic map. 
Measuring point: Top of 6 in (0.15 m) casing, 0.60 ft (0.18 m) above land-surface datum. 
REMARKS.--Observation well. 
PERIOD OF RECORD.--September 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 14.48 ft (4.41 m) below land-surface datum, July 2, 
1986; lowest water level measured, 49.10 ft (14.97 m) below land-surface datum, Oct. 26, 1982. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Water 
Water 
Water 
Dec. 12 
48.33 
Feb. 27 
46.19 
May 
1 
38.23 
July 
2 
14.48 
182044064454900. Local number, 8. 
LOCATION.--Lat 18°20'44", long 64°45'49". 
Owner: Virgin Islands Government. 
Name: DPW-3. 
AQUIFER.--Louisenhoj Formation. 
WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 ). 
Sounded depth 110 ft (33.5 m). 
DATUM.--Elevation of land-surface datum is about 640 ft (195 m) above mean sea level, from topographic mpa. 
Measuring point: Top of 6 in (0.15 m) casing, 1.80 ft (0.55 m) above land-surface datum. 
REMARKS.--Observation well. 
PERIOD OF RECORD.--September 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 12.17ft (3.71 m) below land-surface datum, July 2, 
1986; lowest water level measured, 69.58 ft (21.21 m) below land-surface datum, Feb. 27, 1986. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Dec. 12 
66.74 
Feb. 27 
69.58 
May 
1 
33.22 
July 
2 
12.17 
a Pumping. 
 
 
 
 
 
  
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
  
 
 
 
 
 
 
GROUND-WATER LEVELS 
ST. JOHN, U.S. VIRGIN ISLANDS 
182044064455000. Local number, 9. 
LOCATION.--Lat 18°20'44", long 64°45'50". 
Owner: Virgin Islands Government. 
Name: DPW-2. 
AQUIFER.--Louisenhoj Formation. 
WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). 
Sounded depth 65 ft (19.8 m). 
DATUM.--Elevation of land-surface datum is about 640 ft (195 m) above mean sea level, from topographic map. 
Measuring point: Top of 6 in (0.15 m) casing, 2.00 ft (0.61 m) above land-surface datum. 
REMARKS.--Observation well. 
PERIOD OF RECORD.--September 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 17.10 ft (5.21 m) below land-surface datum, July 2, 
1986; lowest water level measured, 52.44 ft (15.99 m) below land-surface datum, May 19, 1983. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Dec. 12 
51.25 
Feb. 27 
51.49 
May 
1 
43.09 
July 
2 
17.10 
182044064455200. Local number, 10. 
LOCATION.--Lat 18°20'44", long 64°45'52". 
Owner: Virgin Islands Government. 
Name: DPW-1. 
AQUIFER.--Louisenhoj Formation. 
WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). 
Sounded depth 60 ft (18.3 m). 
DATUM.--Elevation of land-surface datum about 640 ft (195 m) above mean sea level. 
Measuring point: Top of 6 in (0.15 m) casing, 2.00 ft (0.61 m) above land-surface datum. 
REMARKS.--Observation well. Water levels affected by pumping. 
PERIOD OF RECORD.--September 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 16.60 ft (5.06 m) below land-surface datum, July 2, 
1986; lowest water level measured, 38.92 ft (11.86 m) below land-surface datum, Feb. 27, 1986 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATIONS 
Water 
Water 
Water 
Water 
Date 
level 
Date 
level 
Date 
level 
Date 
level 
Dec. 12 
a38.54 
Feb. 27 
38.92 
May 
1 
38.65 
July 
1 
16.60 
357 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
358 
GROUND-WATER LEVELS 
ST. JOHN, U.S. VIRGIN ISLANDS 
181956064464500. Local number, 11. 
LOCATION.--Lat 18°19'56", long 64°46'45". 
Owner: Virgin Islands Government. 
Name: Guinea Gut Well. 
AQUIFER.--Louisenhoj Formation (Donnelly, 1959). 
WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), casad 6 in (0.15 m). Depth 85 ft 
(25.9 m). 
DATUM.--Elevation of land-surface datum is about 280 ft (85.36 m) above mean sea level, from topographic map. 
Measuring point: Bottom of 0.5 in (0.01 m) hole at 6 in (0.15 m) casing, 1.50 ft (0.46 m) above land-surface 
datum. Prior to June 28, 1983, top of 6 in (0.15 m) casing, 1.80 ft (0.55 m) above land-surface datum. 
REMARKS.--Recording observation well. 
PERIOD OF RECORD.--March 1982 to current year. 
EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 3.05 ft (0.93 m) below land-surface datum, June 13, 
1986; 
lowest water level recorded, 25.25 ft (7.70 m) below land-surface,datum, Oct. 2, 1985. 
WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 
INSTANTANEOUS OBSERVATION AT 1200 
DAY 
OCT 
NOV 
DEC 
JAN 
FEB 
MAR 
APR 
MAY 
JUN 
JUL 
AUG 
SEP 
1 
25.21 
8.00 
8.35 
11.48 
15.67 
19.43 
22.20 
14.32 
3.28 
3.83 
5.19 
7.40 
2 
25.24 
7.56 
8.45 
11.57 
15.81 
19.54 
22.28 
12.94 
3.22 
3.88 
5.36 
7.46 
3 
25.24 
7.65 
8.54 
11.65 
15.92 
19.66 
22.35 
11.19 
3.22 
3.86 
5.53 
7.58 
4 
25.24 
7.74 
8.64 
11.75 
16.09 
19.77 
22.42 
9.69 
3.21 
3.95 
5.70 
7.72 
5 
25.24 
7.84 
8.73 
11.87 
16.23 
19.87 
22.47 
9.00 
3.21 
3.97 
5.90 
7.83 
6 
25.07 
7.93 
8.85 
11.99 
16.41 
19.97 
22.52 
8.48 
3.19 
4.00 
6.15 
7.99 
7 
19.65 
8.02 
8.98 
12.14 
16.57 
20.07 
22.59 
7.51 
3.17 
4.02 
6.34 
8.09 
8 
16.84 
8.10 
9.08 
12.27 
16.73 
20.18 
22.66 
6.94 
3.15 
4.11 
6.55 
8.22 
9 
15.98 
8.08 
9.17 
12.41 
16.87 
20.28 
22.70 
6.61 
3.14 
4.17 
6.74 
8.38 
10 
16.52 
8.17 
9.26 
12.41 
17.04 
20.38 
22.74 
6.43 
3.12 
4.24 
6.84 
8.53 
11 
16.91 
8.26 
9.35 
12.48 
17.20 
20.47 
22.80 
5.43 
3.11 
4.28 
6.83 
8.61 
12 
17.27 
8.32 
9.40 
12.62 
17.36 
20.58 
22.87 
5.31 
3.12 
4.33 
6.73 
8.69 
13 
17.61 
8.41 
9.56 
12.75 
17.50 
20.68 
22.93 
5.01 
3.10 
4.42 
6.77 
8.80 
14 
17.88 
8.50 
9.73 
12.90 
17.65 
20.76 
22.99 
4.50 
3.11 
4.48 
6.65 
8.91 
15 
18.20 
8.59 
9.83 
13.07 
17.78 
20.84 
23.06 
4.64 
3.11 
4.44 
6.65 
9.02 
16 
18.53 
8.65 
9.93 
13.19 
17.93 
20.92 
23.14 
4.59 
3.13 
4.37 
6.74 
9.16 
17 
18.81 
7.77 
10.05 
13.34 
18.06 
21.01 
23.20 
4.53 
3.15 
4.44 
6.90 
9.26 
18 
19.03 
7.64 
10.16 
13.48 
18.16 
21.09 
23.26 
3.65 
3.17 
4.54 
7.09 
9.41 
19 
18.28 
7.74 
10.27 
13.66 
18.26 
21.18 
23.31 
3.90 
3.23 
4.60 
7.26 
9.53 
20 
17.77 
7.77 
10.36 
13.83 
18.37 
21.27 
23.39 
3.97 
3.27 
4.66 
7.46 
9.64 
21 
17.56 
7.41 
10.43 
14.00 
18.49 
21.35 
23.46 
3.69 
3.25 
4.73 
7.64 
9.75 
22 
17.55 
7.53 
10.47 
14.15 
18.61 
21.44 
23.53 
3.76 
3.32 
4.84 
7.81 
9.85 
23 
17.59 
7.62 
10.57 
14.29 
18.74 
21.54 
23.59 
3.72 
3.42 
4.84 
7.96 
9.94 
24 
17.66 
7.71 
10.66 
14.42 
18.87 
21.62 
23.65 
3.66 
3.47 
4.86 
8.06 
10.03 
25 
17.41 
7.81 
10.76 
14.57 
18.97 
21.70 
23.71 
3.60 
3.55 
4.97 
8.08 
10.14 
26 
17.11 
7.90 
10.87 
14.71 
19.07 
21.76 
23.78 
3.54 
3.62 
5.04 
8.20 
10.18 
27 
16.96 
7.99 
10.99 
14.88 
19.19 
21.83 
23.84 
3.44 
3.62 
5.09 
8.33 
10.25 
28 
16.78 
8.08 
11.05 
15.05 
19.31 
21.89 
23.64 
3.43 
3.72 
5.20 
8.42 
10.30 
29 
16.38 
8.17 
11.14 
15.19 
21.98 
22.69 
3.39 
3.79 
5.36 
7.86 
10.44 
30 
11.92 
8.26 
11.24 
15.33 
22.05 
17.21 
3.34 
3.84 
5.34 
7.40 
10.59 
31 
8.93 
11.38 
15.49 
22.14 
3.31 
5.10 
7.39 
LOW 
25.24 
8.65 
11.38 
15.49 
19.31 
22.14 
23.84 
14.32 
3.84 
5.36 
8.42 
10.59 
HIGH 
8.93 
7.41 
8.35 
11.48 
15.67 
19.43 
17.21 
3.31 
3.10 
3.83 
5.19 
7.40 
WTR YR 1986 
MEAN 11.7 
LOW 25.24 
HIGH 3.10 
0 
91 
T 
araR 
9 
Z 
v9 18 
e:31 
etz 
W5 27 
a
4c 
0140.1 FMAMJJ ASONDJ F M Ald1J J ASOND J FIAAMjJ AS
1983 1984 
1985 
1986 
 
 
 
 
 
 
 
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
  
 
 
 
 
  
 
 
 
 
 
 
 
 
 
  
 
  
 
  
 
 
 
 
 
 
 
  
 
  
 
 
  
  
 
 
 
  
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
INDEX 
359 
Page 
Page 
Access to WATSTORE data 
31 
Acre-foot, definition of 
32 
Adenosine triphosphate, definition of 
32 
Adjuntas, Lago Garzas No. 1 near dam near 
 296-299 
Adjuntas, Rio Grande de Arecibo near 
70-71 
Aguada, Rio Culebrinas near 
 284-285 
Aguas Buenas, Rio de Bayamon near 
 140-141 
Algae growth potential, definition of 
32 
Analyses of samples collected at water-quality 
partial-record stations in Puerto Rico 
 293-299 
Afiasco, Rio Grande de Afiasco near 
 277-278 
Aquifer, definition of 
32 
Arecibo, Rio Grande de Arecibo above 
78-79 
Artesian, definition of 
32 
Artificial substrate, definition of 
42 
Ash mass, definition of 
33 
Bairoa near Caguas, Rio 
 171-172 
Bacteria, definition of  
32 
Bahia de San Juan No. 5 at San Juan 
151 
Bayamon, at Flood Channel at Bayamon, Rio de 
 144-145 
near Aguas Buenas 
 140-141 
Bayamon basin, Rio de, ground-water records in 
322 
water-quality records in 
 140-145 
Bayamon, Rio Guaynabo near 
 142-143 
Bayaney, Rio Camuy near 
64-65 
Bed material, definition of 
33 
Bed load, definition of 
41 
Bed load discharge, definition of 
41 
Biochemical oxygen demand, definition of 
33 
Biomass, definition of 
33 
Blanca at El Jagual, Quebrada 
 158-159 
Blanco basin, Rio, gaging station records in 
 211-212 
Blasina near Carolina, Quebrada 
 154-155 
Blue-green algae, definition of  
39 
Bonne Resolution Gut at Bonne Resolution, 
St. Thomas, VI 
337 
Boqueron, Laguna Cartagena near 
250 
BoquerOn, Laguna Cartagena outflow near 
 251-252 
Borinquen, Rio Turabo at 
 164-165 
Bottom material, definition of  
33 
Bucana basin, Rio, crest-stage partial records in 
289 
ground-water records in 
330 
water-quality records in 
 236-237 
Bucana Floodway Channel at Highway 14 bridge near 
Ponce, Rio 
289 
Caguas, Lago Loiza No. 4 near mouth near 
 293-295 
Caguas, Rio Bairoa near 
 171-172 
Caguas, Rio Caguitas at Highway 30 at 
 169-172 
Caguas, Rio Grande de Loiza at 
 166-168 
CagUitas at Highway 30 at Caguas, Rio 
 169-170 
Caimito near Juncos, Quebrada 
 173-174 
Campo Rico, Rio Canovanas near 
 186-187 
Camuy basin, Rio, gaging station records in 
64-67 
ground-water records in 
305 
Camuy near Bayaney, Rio 
64-65 
near Hatillo 
66-67 
Canal Principal de Diversiones at Lago de Guajataca 
56-57 
Canovanas near Campo Rico, Rio 
 186-187 
Caonillas above Lago Caonillas near Jayuya, Rio 
74-75 
Carolina, Quebrada Blasina near 
 154-155 
Catafio, Rio Hondo at Flood Channel near 
 138-139 
Cayaguas at Cerro Gordo, Rio 
162-163 
Cayey, Lago Carite No. 1 near dam 
 296-299 
Cayey, Lago Carite No. 3 on Rio de la Plata near 
 293-295 
Cells/volume, definition of 
33 
Central Cambalache, Rio Grande de Arecibo at 
90-91 
Central Rufina, Rio Guayanilla at 
 244-245 
Central San Vicente, Drainage Ditch at Rio Cibuco 
below 
 120-121 
Central San Vicente, Rio Cibuco below 
 122-123 
Cerrillos near Ponce, Rio 
 236-237 
Cerro Gordo, Rio Cayaguas at 
 162-163 
Charco Hondo, Rio Tanama at 
88-89 
Chemical oxygen demand, definition of 
34 
Chico at Providencia, Rio 
 222-223 
Chico basin, Rio, water-quality records in 
 222-223 
Chlorophyll, definition of 
34 
Ciales, Rio Cialitos at Highway 649 at 
 103-104 
Ciales, Rio Grande de Manati at 
 99-100 
Ciales, Rio Grande de Manati at Highway 149 at 
 101-102  
Cialitos at Highway 649 at Ciales, Rio 
 103-104 
Cibuco at Vega Baja, Rio 
 115-117 
below Central San Vicente 
 122-123 
below Corozal 
 112-114 
Cibuco basin, gaging-station records in 
 112-115 
ground-water records in 
 313-316 
water-quality records in 
 113-123 
Coamo basin, Rio, ground-water records in  
328 
water-quality records in 
 228-229 
Coamo near Coamo, Rio 
228-229 
Color unit, definition of 
34 
Comerio, Rio de la Plata near 
 129-130 
Contents, definition of 
34 
Control, definition of 
34 
Control structure, definition of 
34 
Cooperation  
2 
Corozal, Rio Cibuco below 
 112-114 
Crest-stage station, definition of 
34 
Crest-stage partial-record stations, discharge at 
289 
Cubic foot per second, definition of 
34 
Cubic foot per second-day, definition of 
34 
Cubic feet per second per square mile, definition of 
34 
Culebrinas, at Highway 404 near Hoed, Rio 
 282-283 
near Aguada 
 284-285 
near San Sebastian 
 280-281 
Culebrinas basin, Rio, gaging station records in 
282 
ground-water records in 
 332-333 
water-quality records in 
 280-285 
Damsite, Lago Loiza at 
183 
Definition of terms 
32-45 
Descalabrado basin, Rio, gaging stations records in 
230 
Descalabrado near Los Llanos, Rio  
230 
Diatoms, definition of 
39 
Discharge at crest-stage partial-record stations 
289 
Discharge at partial-record stations in Puerto Rico 
289 
Discharge, definition of 
34 
Dissolved, definition of 
35 
Dissolved-solids concentrations 
35 
Diversity index, definition of 
35 
Drainage area, definition of 
35 
Drainage basin, definition of 
35 
Drainage ditch at Rio Cibuco below Central San 
Vicente 
 120-121 
below Warner Lambert Lab. near Sabana 
 118-119 
Dry mass, definition of 
33 
El Verde, Quebrada Sonadora near 
 190-191 
El Verde, Quebrada Toronja at 
 192-193 
Espiritu Santo basin, Rio, gaging station records in  190-194 
water-quality records in 
 195-196 
Espiritu Santo near Rio Grande, Rio 
194-196 
Explanation of records 
9-31 
Fajardo basin, Rio, gaging station records in 
201 
water-quality records in 
 202-210 
Fajardo below Fajardo, Rio 
209-210 
near Fajardo 
 201-208 
Fecal coliform bacteria, definition of 
33 
Fecal streptococcal bacteria, definition of 
33 
Florida, Rio Grande de Arecibo below Lago Dos 
Bocas near 
Gage-height, definition of 
Gaging station, definition of 
Grande de Afiasco basin, Rio, gaging station 
records in 
274 
water-quality records in 
 272-278 
Grande de Afiasco near Afiasco, Rio 
277-278 
near Lares 
 272-273 
near Sari Sebastian 
 274-276 
Grande de Arecibo at Central Cambalache, Rio 
90-91 
above Arecibo 
78-79 
below Lago Dos Bocas near Florida 
76-77 
near Adjuntas 
70-71 
near Utuado  
72-73 
Grande de Arecibo basin, Rio, gaging station records 
in 
78-80 
ground-water records in 
306 
water-quality partial-record stations, analyses of 
samples collected in 
 293-299 
water-quality records in 
70-91 
76-77 
35 
35 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
  
  
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
 
  
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
  
 
 
 
 
 
 
  
 
  
 
  
 
   
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
  
 
 
  
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
360 
INDEX 
Page 
Page 
Grande de Loiza at Caguas, Rio 
 166-168 
at Quebrada Arenas 
 156-157 
below Trujillo Alto 
 184-185 
Grande de Loiza basin, Rio, gaging station records 
in 
 156-187 
ground-water records in 
325 
water-quality partial-record stations, analyses 
of samples collected in 
 293-299 
water-quality records in 
 154-185 
Grande de Manati at Ciales, Rio 
 99-100 
at Highway 2 near Manati 
 105-109 
at Highway 149 at Ciales 
 101-102 
near Morovis 
96-98 
Grande de Manati basin, Rio, gaging station records 
in 
 96-105 
ground-water records in 
 307-312 
water-quality records in 
 94-110 
Grande de Patillas near Patillas, Rio 
 224-226 
Grande de Patillas basin, Rio, gaging station 
records in 
224 
water-quality records in 
 225-226 
Graphs: 
Ground-water levels at selected wells in Puerto 
Rico and the U.S. Virgin Islands 
6 
Monthly-mean discharge of selected streams in 
Puerto Rico 
4 
Green algae, definition of 
39 
Grid showing system for numbering wells and 
miscellaneous sites (latitude and longitude). 
18 
Ground-water level, records of 
28-30 
Ground-water quality, records of 
30-31 
Ground-water records for Puerto Rico 
 303-333 
Ground-water records for U.S. Virgin Islands 
 343-358 
Ground-water station, definition of 
35 
Ground-water stations in Puerto Rico, map showing 
location of 
15 
Ground-water stations in the U.S. Virgin Islands, 
map showing location of 
17 
Ground-water wells in U.S. Virgin Islands, map 
showing location of 
17 
Guadiana near Naranjito, Rio 
 131-132 
Guajataca above Lago de Guajataca, Rio 
54-55 
above mouth near Quebradillas 
60-62 
at Lares 
52-53 
below Lago de Guajataca 
58-59 
Guajataca basin, Rio, gaging station records in 
54-60 
ground-water records in 
 303-304 
water-quality partial-record stations, analyses of 
samples collected in 
 293-299 
water-quality records in 
52-62 
Guanajibo near Hormigueros, Rio 
 265-267 
near San German 
254-255 
Guanajibo basin, Rio, gaging station records in 
256-265 
ground-water records in 
331 
water-quality records in 
 254-267 
Guanica, Rio Loco at 
 246-247 
Guayanes above mouth at Playa de Guayanes, Rio 
 218-219 
at Yabucoa 
 216-217 
Guayanes basin, Rio, ground-water records in 
327 
water-quality records in 
 216-219 
Guayanilla at Central Rufina, Rio 
 244-245 
near Guayanilla 
243 
Guayanilla basin, Rio, gaging station records in 
243 
water-quality records in 
 244-245 
Guaynabo near Bayamon, Rio 
 142-143 
Guinea Gut at Bethany, St. John, VI 
339 
Gurabo at Gurabo, Rio 
 179-180 
near Gurabo 
 181-182 
Gurabo, Quebrada Mamey near 
 177-178 
Hardness, definition of 
36 
Hatillo, Rio Camuy near 
66-67 
-Hato Rey, Rio Piedras at 
 148-149 
Hondo at Flood Channel near Catafio, Rio 
 138-139 
Hondo basin, Rio, ground-water records in 
321 
water-quality records in 
 138-139 
Hormigueros, Rio Guanajibo near 
 265-267 
Hormigueros, Rio Rosario near 
 257-264 
Humacao at Highway 3 at Humacao, Rio 
 214-215 
Humacao basin, Rio, water-quality records in 
 214-215 
Hydrologic Bench-Mark Network, definition of 
36 
Hydrologic conditions, summary of 
2-9 
Hydrologic unit, definition of 
36  
Icacos near Naguabo, Rio 
 211-212 
Identification numbers, stations 
12-18 
InabOn at Real Abajo, Rio 
 234-235 
Inabon basin, Rio, gaging station records in 
 234-235 
Instantaneous discharge, definition of 
34 
Introduction 
1 
Jacaguas at Juana Diaz, Rio 
231 
Jacaguas basin, Rio, gaging station records in 
231 
Jagual, Quebrada Blanca at El 
 158-159 
Jayuya, Rio Caonillas above Lago Caonillas near 
74-75 
Jolly Hill Gut at Jolly Hill, St. Croix, VI 
340 
Joyuda, Quebrada Mamey at 
253 
Juana Diaz, Rio Jacaguas at 
231 
Juncos, Quebrada Caimito near 
 173-174 
Juncos, Rio Valenciano near 
 175-176 
Lago Carite No.1 near dam near Cayey 
 296-299 
No. 3 on Rio de la Plata near Cayey 
 293-295 
Lago de Guajataca, Canal Principal de Diversiones at 
56-57 
No. 1 near dam near Quebradillas 
 296-299 
No. 3 near mouth near Quebradillas 
 293-295 
Rio Guajataca above 
54-55 
Rio Guajataca below 
58-59 
Lago Dos Bocas No. 1 near dam near 
Utuado 
 296-299 
No. 3 at west branch near Utuado 
 293-295 
Lago Garzas No. 1 near dam near 
Adjuntas 
 296-299 
Lago La Plata No. 3 near dam near 
Naranjito 
 296-299 
No. 5 near mouth near Naranjito 
 293-295 
Lago Loiza at damsite 
183 
No. 4 near mouth near Caguas 
 293-295 
No. 7 near dam near Trujillo Alto 
 296-299 
Laguna Cartagena basin, gaging station records in 
 250-252 
Laguna Cartagena near BoquerOn 
250 
Laguna Cartagena outflow near Boqueron 
 251-252 
Laguna Joyuda basin, gaging station records in 
253 
Laguna San Jose No. 2 at San Juan 
150 
Laguna Tortuguero basin, water-quality records in 
110 
Laguna Tortuguero outlet near Vega Baja 
110 
Land-surface datum, definition of 
36 
La Plata at Proyecto La Plata, Rio de 
 126-128 
at Highway 2 near Toa Alta 
136 
at Toa Alta 
 133-135 
near Comerio 
 129-130 
La Plata basin, Rio de, gaging station records in 
 126-136 
ground-water records in 
 317-320 
water-quality partial-record stations, analyses of 
samples collected in 
 293-299 
water-quality records in 
 127-135 
Lares, Rio Grande de Afiasco near 
 272-273 
Lares, Rio Guajataca at 
52-53 
Levels for Puerto Rico, ground-water 
 303-333 
Levels for U.S. Virgin Islands, ground water 
 343-358 
Loco at Guanica, Rio 
 246-247 
Loco basin, Rio, water-quality records in 
 246-247 
Los Llanos, Rio Descalabrado near 
230 
Mamey at Joyuda, Quebrada 
253 
Mamey near Gurabo, Quebrada 
 177-178 
Mameyes near Sabana, Rio 
 197-198 
Mameyes basin, Rio, gaging station records in 
 197-198 
Manati, Rio Grande de Manati at Highway 2 near 
 105-109 
Maps: 
Location of continuous surface-water stations and 
crest-stage gage stations in Puerto Rico 
13 
Location of ground-water stations in Puerto Rico 
15 
Location of ground-water stations in the U.S. Virgin 
Islands 
17 
Location of maximum concentration of fecal coliform 
bacteria at sample sites 
10 
Location of maximum concentration of fecal 
streptococci bacteria at sample sites 
11 
Location of surface-water stations in the U.S. 
Virgin Islands 
16 
Location of water-quality stations in Puerto Rico 
14 
Rio Camuy basin 
63 
Rio Cibuco basin 
111 
Rio Culebrinas basin 
279 
Rio Grande de Arecibo basin 
69 
Rio Grande de Loiza basin 
153 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
INDEX 
361 
Page 
Maps: 
Rio Grande de Manati basin 
93 
Rio Guajataca basin 
51 
Rio Guanajibo basin 
249 
Rio Herrera to the Rio Anton Ruiz basins 
189 
Rio Hondo to the Rio Puerto Nuevo basins 
137 
Rio Humacao to the Rio Seco basins 
213 
Rio InabOn to the Rio Loco basins 
233 
Rio de la Plat.. basin 
125 
Rio Salinas to the Rio Jacaguas basins 
227 
Rio YagOez and the Rio Grande de Afiasco basins 
269 
Maunabo at Maunabo, Rio 
220-221 
Maunabo basin, Rio, water-quality records in 
220-221 
Maximum concentrations of fecal coliform bacteria at 
sampled sites, map showing location of 
10 
Maximum concentrations of fecal streptococci bacteria 
at sampled sites, map showing location of.... 
11 
Mayaguez, Rio YagOez near 
270-271 
Mean concentration, definition of 
41 
Mean discharge, definition of 
34 
Measuring point, definition of 
36 
Metamorphic stage, definition of 
36 
Methylene blue active substances, definition of 
36 
Micrograms per gram, definition of 
36 
Micrograms per liter, definition of 
36 
Milligrams of carbon per area or volume per unit time 
for periphyton and macrophytes and for 
phytoplankton, definition of 
40 
Milligrams of oxygen per area or volume per unit time 
for periphyton and macrophytes and for 
phytoplankton, definition of 
40 
Milligrams per liter, definition of 
36 
Moca, Rio Culebrinas at Highway 404 near 
282-283 
Morovis, Rio Grande de Manati near 
96-98 
Naguabo, Rio Icacos near 
211-212 
Naranjito, Lago La Plata No. 3 near 
dam near 
296-299 
Naranjito, Lago La Plata No. 5 near mouth near 
293-295 
Naranjito, Rio Guadiana near 
131-132 
National Stream-Quality Accounting Network, 
definition of 
37 
National Trends Network, definition of 
38 
Natural substrate, definition of 
42 
Networks and programs, special 
9 
Organic mass, definition of 
33 
Organism, definition of 
38 
Organism count/area, definition of 
38 
Organism count/volume, definition of 
38 
Orocovis near Orocovis, Rio 
94-95 
Parameter code, definition of 
38 
Partial record station, definition of 
38 
Partial-record stations, Discharge at 
289 
Particle size, definition of 
38 
Particle-size classification, definition of 
38 
Patillas, Rio Grande de Patillas near 
224-226 
Percent composition, definition'of 
39 
Periphyton, definition of 
39 
Pesticides, definition of 
39 
Phytoplankton, definition of 
39 
Picocurie, definition of 
39 
Piedras, at Hato Rey, Rio 
148-149 
near Rio Piedras 
146-147 
Plankton, definition of 
39 
Playa de Guayanes, Rio Guayanes above mouth at 
218-219 
Polychlorinated biphenyls, definition of 
40 
Ponce, Rio Bucana floodway channel at Highway 14 
bridge near 
289 
Ponce, Rio Cerrillos near 
236-237 
Ponce, Rio Portugues at 
241-242 
Ponce, Rio Portugues at Highway 14 at 
289 
Ponce, Rio Portugues near 
238-240 
Portugues at Highway 14 at Ponce, Rio 
289 
at Ponce 
241-242 
near Ponce 
238-240 
Portugues basin, Rio, crest-stage partial-record 
station in 
289 
gaging station records in 
238 
water-quality records in 
239-242 
Primary productivity, definition of 
40 
Programs, special networks and 
9 
Page 
Providencia, Rio Chico at 
222-223 
Proyecto La Plata, Rio de La Plata at 
126-128 
Publications on techniques of water-resources 
investigations 
47-48 
Puerto Nuevo basin, Rio, ground-water records in 
323-324 
water-quality records in 
146-151 
Quality of water records of Puerto Rico, surface-
and 
51-285 
Quebrada Arenas, Rio Grande de Loiza at 
156-157 
Quebradillas, Lago Guajataca No. 1 near 
dam near 
296-299 
Quebradillas, Lago Guajataca No. 3 near mouth near... 293-295 
Quebradillas, Rio Guajataca above mouth near 
60-62 
Radiochemical program, definition of 
40 
Real Abajo, Rio InabOn at 
234-235 
Records, explanation of 
9-31 
Records of ground-water levels 
28-30 
Records of ground-water quality 
30-31 
Records of stage and water discharge 
18-23 
Records of surface-water quality 
23-28 
Recoverable from bottom material, definition of 
40 
Return period, definition of 
40 
Rio Grande, Rio Espiritu Santo near 
194-196 
Rio Piedras, Rio Piedras near 
146-147 
Rosario at Rosario, Rio 
256 
near Hormigueros 
257-264 
Runoff, in inches, definition of 
40 
Sabana at Sabana, Rio 
199-200 
Sabana basin, Rio, gaging station records in 
199-200 
Sabana, Drainage ditch below Warner Lambert 
Lab. near 
118-119 
Sabana, Rio Mameyes near 
197-198 
Salvatierra near San Lorenzo, Quebrada 
160-161 
San German, Rio Guanajibo near 
254-255 
San Juan, Bahia de San Juan no. 5 at 
151 
San Juan, Laguna San Jose No. 2 at 
150 
San Lorenzo, Quebrada Salvatierra near 
160-161 
San Sebastian, Rio Culebrinas near 
280-281 
San Sebastian, Rio Grande de Afiasco near 
274-276 
Seco basin, Rio, ground-water records in 
326 
Sediment, definition of 
41 
Sodium-adsorption-ratio, definition of 
42 
Sonadora near El Verde, Quebrada 
190-191 
Solute, definition of 
42 
Special network and programs 
9 
Specific conductance, definition of 
42 
Stage-discharge relation, definition of 
42 
Station identification numbers 
12-18 
St. Croix, VI, Jolly Hill Gut at Jolly Hill 
340 
St. John, VI, Guinea Gut at Bethany 
339 
Streamflow, definition of 
42 
St. Thomas, VI, Bonne Resolution Gut at Bonne 
Resolution 
337 
St. Thomas, VI, Turpentine Run at Mariendal 
338 
Substrate, definition of 
42 
Summary of hydrologic conditions 
2-9 
Surface and quality-of-water records for Puerto Rico. 51-285 
Surface area, definition of 
42 
Surface-water quality, records of 
23-28 
Surface-water records for U.S. Virgin Islands 
337-340 
Surface-water and crest-stage gage stations in 
Puerto Rico, map showing location of 
13 
Surface-water stations in U.S. Virgin Islands, map 
showing location of 
16 
Surficial bed material, definition of 
42 
Suspended, definition of 
42 
Suspended-recoverable, definition of 
43 
Suspended sediment, definition of 
41 
Suspended-sediment concentration, definition of 
41 
Suspended-sediment discharge, definition of 
41 
Suspended-sediment load, definition of 
41 
Suspended-total, definition of 
43 
Tanama at Charco Hondo, Rio 
88-89 
near Utuado 
80-87 
Taxonomy, definition of 
43 
Techniques of water-resources investigations, 
publications on 
46-47 
Terms, definition of 
32-45 
Thermograph, definition of 
43 
 
 
 
  
 
 
  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
362 
INDEX 
Page 
Page 
Time-weighted average, definition of 
43 
Toa Alta, Rio de La Plata at 
 133-135 
Toa Alta, Rio de La Plata at Highway 2 near 
136 
Tons per acre-foot, definition of 
44 
Tons per day, definition of 
44 
Toronja at El Verde, Quebrada 
 192-193 
Total, definition of 
44 
Total coliform bacteria, definition of 
32 
Total discharge, definition of 
44 
Total organism count, definition of 
38 
Total-recoverable, definition of 
44 
Total sediment discharge, definition of 
41 
Total-sediment load, definition of 
41 
Tritium network, definition of 
44 
Trujillo Alto, Lago Loiza No. 7 near 
dam near 
 296-299 
Trujillo Alto, Rio Grande de Loiza below 
 184-185 
Turabo at Borinquen, Rio 
 164-165 
Turpentine Run at Mariendal, St. Thomas, VI 
338 
Utuado, Lago Dos Bocas No. 1 near dam 
near 
 296-299 
Utuado, Lago Dos Bocas No. 3 at west branch near 
 293-295 
Utuado, Rio Grande de Arecibo near 
72-73 
Utuado, Rio Tanama near 
80-87 
Valenciano near Juncos, Rio 
 175-176 
Vega Baja, Laguna Tortuguero outlet near 
110 
Vega Baja, Rio Cibuco at 
 115-117 
Water-discharge, records of stage and 
18-23 
Water-quality partial-record stations in Puerto Rico, 
analyses of samples collected at 
 293-299 
Water-quality stations in Puerto Rico, map 
showing location of 
14 
Water-resources investigations, publications on 
techniques of  
46-47 
Water year, definition of 
44 
WATSTORE data, Access to 
31 
WDR, definition of 
44 
Weighted average, definition of 
45 
Wells - Puerto Rico: 
Bayamon basin, Rio de 
Well 219 - Fort Buchanan No. 1 
322 
Bucand basin, Rio 
Well 141 - Restaurada 8A 
330 
Cibuco basin, Rio 
Well 70 - Sabana Hoyos 
313 
Well 211 - Rosario No. 2 
314 
Well 212 - Ponderosa TW-1 
315 
Well 213 - Pampano No. 2 
316 
Camuy basin, Rio 
Well 203 - Vicente Amador 
305 
Coamo basin, Rio 
Well 87 - Alomar 1 
328 
Culebrinas basin, Rio 
Well 83 - San Sebastian 
332 
Well 200 - Aguadilla Cement north 
333 
Grande de Arecibo basin, Rio 
Well 204 - Gilberto Rivera 
306 
Grande de Loiza basin, Rio 
Well 222 - Campo Rico TW-1 
325 
Grande de Manati basin, Rio 
Well 135 - Lederle 
307 
Well 206 - Plazuela No. 2 
308  
Well 207 - Cantito La Luisa 
309 
Well 208 - Acropolis - Manati 
310 
Well 209 - Coto Norte No. 3 
311 
Well 210 - Gelo Martinez 
312 
Guajataca basin, Rio 
Well 165 - Mateo Perez, Bo. Salto 
303 
Well 202 - Carmelo Barreto-Garcia 
304 
Guanajibo basin, Rio 
Well 143 - Vivoni, Hacienda Amistad 
331 
Guayanes basin, Rio 
Well 96 - USGS TW-2 or Yabucoa 7  
327 
Hondo basin, Rio 
Well 218 - Levittown No. 7 
321 
La Plata basin, Rio de 
Well 214 - Dorado Beach No. 7 
317 
Well 215 - Maguayo No. 5 
318 
Well 216 - Pozo Navy - Campanillas 
319 
Well 217 - Monserrate TW-2 
320 
Puerto Nuevo basin, Rio 
Well 220 - Parque San Luis Rey 
323 
Well 221 - Hyde Park TW-10 
324 
Seco basin, Rio 
Well 6 - Juana 5 
326 
Wells - U.S. Virgin Islands: 
St. Croix 
Well 1 - Fairplains 6 (FP6) 
343 
Well 2 - USGS-10, Fairplains 2 (FP2) 
344 
Well 3 - Golden Grove 6 (PW6) 
345 
Well 4 - Golden Grove 1 (PW1) 
346 
Well 5 - Mahogany Road 3 
346 
Well 6 - Adventure 28 
347 
Well 7 - Concordia 14 
348 
Well 8 - Concordia 1 (main pump house) 
348 
Well 9 - Concordia 7 
349 
Well 10 - Barren Spot 5 (PWD-5) 
349 
St. John 
Well 1 - NPS-2 (Cruz Bay) 
353 
Well 2 - NPS-5 (Trunk Bay) 
353 
Well 3 - NPS-6 (Cinnamon Bay) 
354 
Well 5 - DPW-6 
355 
Well 6 - DPW-5 
356 
Well 7 - DPW-4 
356 
Well 8 - DPW-3 
356 
Well 9 - DPW-2 
357 
Well 10 - DPW-1 
357 
Well 11 - Guinea Gut Well 
358 
St. Thomas 
Well 1 - USGS-8 (Family well-Thatch Farm) 
350 
Well 2 - Mahogany 15 
350 
Well 3 - Mahogany 16 
350 
Well 4 - Mahogany 17 
351 
Well 5 - Donoe 3 
351 
Well 6 - Grade School 3 
352 
Yauco basin, Rio 
Well 132 - Yauco 2 
329 
Wet mass, definition of 
33 
WSP, definition of 
45 
Yabucoa, Rio Guayanes at 
 216-217 
YagUez near Mayaguez, Rio 
 270-271 
YagUez basin, Rio, water-quality records in 
 270-271 
Yauco basin, Rio, ground-water records in 
329 
Zooplankton, definition of 
39 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
October 1, 1978 
FACTORS FOR CONVERTING INCH-POUND UNITS TO INTERNATIONAL 
SYSTEM UNITS (SI) 
The following factors may be used to convert the inch-pound units published herein to 
the International System of Units (SI). This report contains both the inch-pound and SI unit 
equivalents in the station manuscript descriptions. 
Multiply inch-pound units 
By 
Length 
inches (in) 
feet (ft) 
miles (mi) 
2.54x10' 
2.54x10-2 
3.048x10-' 
1.609x10° 
Area 
acres 
square miles (mil) 
4.047x103 
4.047x10­
4.047x1T3 
2.590x10° 
Volume 
gallons (gal) 
million gallons 
cubic feet (ft3 ) 
cfs-days 
acre-feet (acre-ft) 
3.785x10° 
3.785x10° 
3.785x10-3 
3.785x103 
3.785x10-3 
2.832x10' 
2.832x 10'2 
2.447x103 
2.447x10-3 
1.233x103 
1.233x10-3 
1.233x10-6 
Flow 
cubic feet per second (ft3 /s) 
gallons per minute (gal/min) 
million gallons per day 
2.832x10' 
2.832x10' 
2.832x10-2 
6.309x10-2 
6.309x10-2 
6.309x10-5 
4.381 x10' 
4.38 lx10-2 
Mass 
tons (short) 
9.072x10-' 
To obtain SI units 
millimeters (mm) 
meters (m) 
meters (m) 
kilometers (km) 
square meters (m2 ) 
square hectometers (hm2 ) 
square kilometers (km2 ) 
square kilometers (km2 ) 
liters (L) 
cubic decimeters (dm3 ) 
cubic meters (m3 ) 
cubic meters (m3 ) 
cubic hectometers (hm3 ) 
cubic decimeters (dm3 ) 
cubic meters (m3 ) 
cubic meters (m3 ) 
cubic hectometers (hm3 ) 
cubic meters (m3 ) 
cubic hectometers (hm3 ) 
cubic kilometers (km3 ) 
liters per second (L/s) 
cubic decimeters per second (dm3 /s) 
cubic meters per second (m3 /s) 
liters per second (L/s) 
cubic decimeters per second (dm3 /s) 
cubic meters per second (m3 /s) 
cubic decimeters per second (dm3 /s) 
cubic meters per second (m3 /s) 
megagrams (Mg) or metric tons 
u.s DEPAK I mEIN . -
INT 413 
US. DEPARTMENT OF THE INTERIOR 
Geological Survey 
GPO Box 4424 
San Juan, PR 00936 
OFFICIAL BUSINESS 
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