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Water Resources Data Puerto Rico and the U.S. Virgin Islands Water Year 1985 GEOLT;icil „ s,EsToN, * DECO 9 1987 11 A g Culebra, PR St. Thomas C:rfo St. John Vieques, PR U.S.. VIRGIN ISLANDS St. Croix U.S. GEOLOGICAL SURVEY WATER-DATA REPORT PR-85-1 Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands, and other agencies CALENDAR FOR WATER YEAR 1985 1984 OCTOBER NOV EMBER DECEMBER SMTWTFS SMTWTFS SMTWTFS 1 2 3 4 5 6 1 2 3 1 7 8 9 10 11 12 13 4 5 6 7 8 9 10 2 3 4 5 6 7 8 14 15 16 17 18 19 20 11 12 13 14 15 16 17 9 10 11 12 13 14 15 21 22 23 24 25 26 27 18 19 20 21 22 23 24 16 17 18 19 20 21 22 28 29 30 31 25 26 27 28 29 30 23 24 25 26 27 28 29 30 31 1985 J A NU AR Y F EBRUAR Y MARCH SMTWTFS SMTWTFS SMTWTFS 1 2 3 4 5 1 2 1 2 6 7 8 9 10 11 12 3 4 5 6 7 8 9 3 4 5 6 7 8 9 13 14 15 16 17 18 19 10 11 12 13 14 15 16 10 11 12 13 14 15 16 20 21 22 23 24 25 26 17 18 19 20 21 22 23 17 18 19 20 21 22 23 27 28 29 30 31 24 25 26 27 28 24 25 26 27 28 29 30 31 APRIL MAY JUNE SMTWTF S SMTWTFS SMTWTFS 1 2 3 4 5 6 1 2 3 4 1 7 8 9 10 11 12 13 5 6 7 8 9 10 11 2 3 4 5 6 7 8 14 15 16 17 18 19 20 12 13 14 15 16 17 18 9 10 11 12 13 14 15 21 22 23 24 25 26 27 19 20 21 22 23 24 25 16 17 18 19 20 21 22 28 29 30 26 27 28 29 30 31 23 24 25 26 27 28 29 30 JULY AUGUST SEP TEMBER SMTWTFS SMTW T F S SMTWTFS 1 2 3 4 5 6 1 2 3 1 2 3 4 5 6 7 7 8 9 10 11 12 13 4 5 6 7 8 9 10 8 9 10 11 12 13 14 14 15 16 17 18 19 20 11 12 13 14 15 16 17 15 16 17 18 19 20 21 21 22 23 24 25 26 27 18 19 20 21 22 23 24 22 23 24 25 26 27 28 28 29 30 31 25 26 27 28 29 30 31 29 30 Water Resources Data Puerto Rico and the U.S. Virgin Islands Water Year 1985 by Eloy Coldn-Dieppa, Pedro L. Diaz, and Rene Garci'a Culebra, PR St. Thomas C 3 St. John Vieques, PR U.S. VIRGIN ISLANDS St. Croix U.S. GEOLOGICAL SURVEY WATER-DATA REPORT PR-85-1 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, Caribbean District, Water Resources Division U.S. Geological Survey GPO Box 4424 San Juan, PR 00936 (Telephone: (809) 753-4414) iii PREFACE 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: Zaida Aquino de Diaz Felipe Hernandez George Arroyo Rafael Pefia-Cortes Margarita Concepcion Luis Santiago-Rivera Ralph Gonzalez 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. 1. REPORT NO. 2. 3. Recipients Accession No. REPORT DOCUMENTATION PAGE USGS/WRD/HD-87/252 4. Title and Subtitle S. Report Date August 1987 Water Resources Data for Puerto Rico and the U.S. Virgin Islands, 41. Water Year 1985 7. Author(%) 6. Performing Organization Rept. No. Eloy Colon-Dieppa, Rene Garcia, and Pedro Diaz USGS-WDR-PR-85-1 9. Performing Organization Name and Address 10. Protect/Task/Work Unit No. U.S. Geological Survey, Water Resources Division 11. Contract(C) or Grant(G) No. G P 0 Box 4424 ml San Juan, Puerto Rico 00936 (G) 12. Sponsoring Organization Nam* and Address 13. Type of Report & Period Covered Annual-Oct. 1, 1984 U.S. Geological Survey, Water Resources Division to Sept. 30, 1985 G P 0 Box 4424 14. San Juan, Puerto Rico 00936 15. Supplementary Notes Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the 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 1985 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 57 streamflow-gaging station, 131 partial-record or miscellaneous streamflow stations, and 1 crest-stage, partial-record streamflow station; stage and content records for 4 lakes and reservoirs; water quality records for 16 streamflow­ gaging stations, 45 ungaged streamsites, 11 lake sites, 1 lagoon, and 1 bay; and water- level records for 94 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. Identifliwa/Open-Ended Terms Puerto Rico, U.S. Virgin Islands, Sampling sites. c. COSATI Flekl/Gioup 111. Availability Statemen: 19. Security Class (This Report) 21. No. of Pages HmrragsIrT7D 414 NO RESTRICTION ON DISTRIBUTION 20. Security Class (This Pogo) 22. Price UNCLASSIFIED (See ANSI-Z39.1$) See instructions on Reverse OPTIONAL. FORM 272 (4-77) (Formerly NTIS-35) Department of Commerce 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 8 Explanation of records 11 Station identification numbers 11 Downstream order system 11 Latitude-longitude system 19 Records of stage and water discharge 19 Data collection and computation 20 Data presentation 21 Identifying estimated daily discharge 24 Accuracy of the records 24 Records of surface-water quality 24 Classification of records 25 Arrangement of records 25 On-site measurements and sample collection 25 Water temperature 26 Sediment 27 Laboratory measurements 27 Data presentation 27 Remark codes 29 Records of ground-water levels 29 Data collection and computation 29 Data presentation 30 Records of ground-water quality 31 Data collection and computation 31 Data presentation 32 Access to WATSTORE data 32 Definition of terms 33 Publications on Techniques of Water-Resources Investigations 47 Surface- and quality-of-water records for Puerto Rico 49 Discharge at partial-record stations in Puerto Rico 291 Water-quality at partial-record stations in Puerto Rico 311 Ground-water records for Puerto Rico 323 Surface-water records for the U.S. Virgin Islands 361 Ground-Water records for the U.S. Virgin Islands 371 Index 389 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 9 4. Map showing location of maximum concentration of fecal streptococci bacteria at sampled sites 10 5. Map showing location of continuous surface-water stations in Puerto Rico 12 6. Map showing location of water-quality stations in Puerto Rico 13 7. Map showing location of low-flow partial-record stations in Eastern Puerto Rico 14 8. Map showing location of low-flow partial-record stations in Central and Western Puerto Rico.. ......... 15 9. Map showing location of ground-water stations in Puerto Rico 16 10. Map showing location of surface-water stations in the U.S. Virgin Islands 17 11. Map showing location of ground-water stations in the U.S. Virgin Islands 18 12. Grid showing system for numbering wells and miscellaneous sites (latitude and longitude).. ••••••00 000 00••• •O 0 • 19 13. Map showing the Rio Guajataca basin 51 14. Map showing the Rio Camuy basin 63 15. Map showing the Rio Grande de Arecibo basin 69 16. Map showing the Rio Grande de Manati basin 89 17. Map showing the Rio Cibuco basin............ •••000••0•••• 105 18. Map showing the Rio de la Plata basin........ ••000••0••• • 117 19. Map showing the Rio Hondo to the Rio Puerto Nuevo basins. 129 20. Map showing the Rio Grande de Loiza basin ....... ......... 145 21. Map showing northeastern river basins--the Rio Herrera to the Rio Anton Ruiz basins 181 22. Map showing southeastern river basins--the Rio Humacao to the Rio Seco basins 207 23. Map showing south coast river basins--the Rio Salinas to the Rio Jacaguas basins 225 24. Map showing south coast river basins--the Rio InabOn to the Rio Loco basins 233 25. Map showing the Rio Guanajibo basin 255 26. Map showing the Rio YagUez and the Rio Grande de Aflasco basins. ...... ....... ....... ....... 269 27. Map showing the Rio Culebrinas basin.................... 283 TABLES vii Page Table 1. Island-wide monthly precipitation averages for 1985 water year 2. Peak discharges during May 17-18, 1985 at selected U.S. Geological Survey streamflow stations through- out Puerto Rico 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- 3 5 7 8 grams per liter to milliequivalents per liter 38 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) ..... ............. 000000 00000000 0 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 Tanama at Charco Hondo (d) 85 Rio Grande de Arecibo at Central Cambalache (c) 87 RIO GRANDE DE MANATI BASIN Rio Orocovis near Orocovis (c) 90 Rio Grande de Manati near Morovis (dc) Rio Grande de Manati at Ciales (d)............ ......... .••.... 95 92 e e Rio Grande de Manati at Highway 149 at Ciales (c) 000 00 ••• • ..... 97 Rio Cialitos at Highway 649 at Ciales (c) 99 Rio Grande de Manati at Highway 2 near Manati (dc) 101 LAGUNA TORTUGUERO BASIN Laguna Tortuguero Outlet near Vega Baja (c) 104 RIO CIBUCO BASIN Rio Cibuco below Corozal (dc) 106 Rio Cibuco at Vega Baja (dc) 109 Drainage Ditch below Warner Lambert Laboratory near Sabana (c) 112 Drainage Ditch at Rio Cibuco below Central San Vicente (c) 113 Rio Cibuco below Central San Vicente (c). ..... ..... ..... 115 RIO DE LA PLATA BASIN Rio de La Plata at Proyecto La Plata (dc) 118 Rio de La Plata near Comerio (c) 121 Rio Guadiana near Naranjito (c) 123 Rio de La Plata at Toa Alta (dc) 125 ix SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED--Continued Page RIO HONDO BASIN Rio Hondo at Flood Channel near Catano (c) 130 RIO DE BAYAMON BASIN Rio de Bayamon near Aguas Buenas (c) 132 Rio Guaynabo near Bayamon (c) 134 Rio de Bayamon at Flood Channel at Bayamon (c) 136 RIO PUERTO NUEVO BASIN Rio Piedras: Rio Piedras near Rio Piedras (c) 138 Laguna San Jose: Bahia de San Juan: Rio Piedras at Hato Rey (c) 140 Laguna San Jose No.2 at San Juan (c) 142 Bahia de San Juan No.5 at San Juan (c) 143 QUEBRADA BLASINA BASIN Quebrada Blasina near Carolina (c) 146 RIO GRANDE DE LOIZA BASIN Rio Grande de Loiza at Quebrada Arenas (d) 148 Rio Gurabo: Quebrada Blanca at El Jagual (d) 150 Quebrada Salvatierra near San Lorenzo (d) 152 Rio Cayaguas at Cerro Gordo (d) 154 Rio Turabo at Borinquen (d) 156 Rio Grande de Loiza at Caguas (dc) 158 Rio Caguitas at Highway 30 at Caguas (c) 161 Rio Bairoa near Caguas (c) 163 Quebrada Caimito near Juncos (d) 165 Rio Valenciano near Juncos (d) 167 Quebrada Mamey near Gurabo (d) 169 Rio Gurabo at Gurabo (d) 171 Rio Gurabo near Gurabo (c) 173 Lago Loiza at Damsite (c) 175 Rio Grande de Loiza below Trujillo Alto (c) 176 Rio Canovanas near Campo Rico (d) 178 RIO ESPIRITU SANTO BASIN Quebrada Sonadora near El Verde (d) 182 Quebrada Toronja at El Verde (d) 184 Rio Espiritu Santo near Rio Grande (dc) 186 RIO MAMEYES BASIN Rio Mameyes near Sabana (d) 189 Rio Mameyes at Highway 191 at Mameyes (d) 191 RIO SABANA BASIN Rio Sabana at Sabana (d) 193 SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED--Continued RIO FAJARDO BASIN Rio Fajardo near Fajardo (dc) Rio Fajardo below Fajardo (c) 201 RIO BLANCO BASIN Rio Icacos near Naguabo (d) Rio Blanco near Florida (d) 203 205 RIO HUMACAO BASIN Rio Humacao at Highway 3 at Humacao (dc) 208 RIO GUAYANES BASIN Rio Guayanes at Yabucoa (c) Rio Guayanes above mouth at Playa de Guayanes (c) 211 213 RIO MAUNABO BASIN Rio Maunabo at Lizas (d) ... . ....... ..... ..... Rio Maunabo at Maunabo (c) RIO CHICO BASIN Rio Chico at Providencia (c) RIO GRANDE DE PATILLAS BASIN Rio Grande de Patillas near Patillas (dc) RIO COAMO BASIN Rio Coamo near Coamo (dc) RIO DESCALABRADO BASIN Rio Descalabrado near Los Llanos (d) RIO JACAGUAS BASIN Rio Jacaguas at Juana Diaz (d) RIO INABON BASIN Rio Inabon at Real Abajo (d) RIO BUCANA BASIN Rio Bucana: Rio Cerrillos near Ponce (dc) RIO PORTUGUES BASIN Rio Portugues near Ponce (dc) Rio Portugues at Ponce (c) ........... ...... RIO GUAYANILLA BASIN Rio Guayanilla near Guayanilla (d) Rio Guayanilla at Central Rufina (c) RIO YAUCO BASIN OOOOOOOOOOOOOOO 215 217 219 221 226 229 231 234 236 239 ....... 242 244 246 Rio Yauco above Diversion Monserrate near Yauco (d) 248 RioYauco near Yauco (d) ..................... ............... 250 SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, xi FOR WHICH RECORDS ARE PUBLISHED--Continued Page RIO LOCO BASIN Rio Loco at Guanica (c) 252 LAGUNA CARTAGENA BASIN Laguna Cartagena near Boqueron (e) 256 Laguna Cartagena Outflow near Boqueron (d) 257 RIO GUANAJIBO BASIN Rio Guanajibo near San German (c) 259 Rio Rosario at Rosario (d) 261 Rio Rosario near Hormigueros (c) 263 Rio Guanajibo near Hormigueros (dc) 265 RIO YAGUEZ BASIN Rio Yaguez near Mayaguez (c) 270 RIO GRANDE DE ANASCO BASIN Rio Blanco near Adjuntas (d) 272 Lago Yahuecas near Castaner (e) 273 Lago Guayo near Castaner (e) 274 Lago Prieto near Castaner (e) 275 Rio Grande de Anasco near Lares (c) 276 Rio Grande de Anasco near San Sebastian (dc) 278 Rio Grande de Anasco near Anasco (c) 281 RIO CULEBRINAS BASIN Rio Culebrinas near San Sebastian (c) 284 Rio Culebrinas at Highway 404 near Moca (d) 286 Rio Culebrinas near Aguada (c) 288 ST. THOMAS, U.S. VIRGIN ISLANDS Bonne Resolution Gut at Bonne Resolution (d) 362 Turpentine Run at Mariendal (d) 364 ST. JOHN, U.S. VIRGIN ISLANDS Guinea Gut at Bethany (d) 366 ST. CROIX, U.S. VIRGIN ISLANDS Jolly Hill Gut at Jolly Hill (d) 368 xii GROUND-WATER WELLS, BY BASIN, FOR WHICH RECORDS ARE PUBLISHED Page RIO GUAJATACA BASIN Well 182538067015900 Local number 164 ................. 324 Well 182421067015000 Local number 165 324 RIO GRANDE DE ARECIBO BASIN Well 181041066441100 Local number 86 325 Well 181307066355000 Local number 123 325 Well 182630066384900 Local number 161 325 RIO GRANDE DE MANATI BASIN Well 182548066300200 Local number 68 326 Well 182603066333600 Local number 71 326 Well 182621066343300 Local number 135 327 Well 182445066315800 Local number 142 328 Well 182542066305200 Local number 166 328 RIO CIBUCO BASIN Well 182446066194800 Local number 62 329 Well 182647066201700 Local number 70 330 Well 182706066213500 Local number 151 331 Well 182612066225400 Local number 155 331 Well 182648066230900 Local number 156 331 Well 182656066221500 Local number 167 332 Well 182751066221900 Local number 168 332 Well 182740066223000 Local number 169 332 RIO DE LA PLATA BASIN Well 180708066084200 Local number 33 333 Well 180852066095400 Local number 37 333 Well 180823066154500 Local number 38.................. 333 000eceeooes Well 182636066164200 Local number 69 ..... ......... ..... 334 Well 182623066181400 Local number 150....... 334 yee0000geoec00000 RIO HONDO TO RIO PUERTO NUEVO BASINS Well 181046066091700 Local number 42 335 Well 182506066030800 Local number 65 335 Well 182547066110800 Local number 66 335 .RIO GRANDE DE LOIZA BASIN Well 181550065593200 Local number 50 336 Well 181538066021300 Local number 52 336 RIO HERRERA TO RIO ANTON RUIZ BASINS Well 181217065453000 Local number 171 337 Well 180908065475000 Local number 173..... ............ 338 RIO HUMACAO TO RIO SECO BASINS Well 175735066095900 Local number 2 339 Well 175735066100400 Local number 3 339 Well 175858066100200 Local number 6 340 Well 175944066033600 Local number 15 341 GROUND-WATER WELTS, BY BASIN, FOR WHICH RECORDS ARE PUBLISHED--Continued Page RIO HUMACAO TO RIO SECO BASINS--Continued Well 180344065523000 Local number 31 342 Well 175640066085100 Local number 89 342 Well 180415065513900 Local number 96 343 Well 180026065544300 Local number 122 344 Well 180010066004500 Local number 125 344 Well 180850065493700 Local number 172 345 RIO SALINAS TO RIO JACAGUAS BASINS Well 175659066155300 Local number 1 346 Well 175851066174600 Local number 8 346 Well 180044066153500 Local number 18 346 Well 180023066175400 Local number 19 347 Well 175829066232100 Local number 87 348 Well 180052066305000 Local number 88 349 Well 175822066134800 Local number 124 349 Well 175750066225800 Local number 144 349 Well 175750066225801 Local number 145 350 Well 175734066233300 Local number 146 350 Well 175734066233301 Local number 147 350 Well 175756066244000 Local number 148 351 Well 175756066244001 Local number 149 351 RIO INABON TO RIO LOCO BASINS Well 175922066495800 Local number 16 352 Well 180057066361000 Local number 21 352 Well 180150066474900 Local number 27 352 Well 180110066473500 Local number 74 353 Well 180058066502700 Local number 131 353 Well 180133066503300 Local number 132 354 Well 180120066503200 Local number 134 355 Well 175950066354200 Local number 141 356 RIO GUANAJIBO BASIN Well 180934067050800 Local number 40............... 357 Well 181018067091700 Local number 43 357 Well 180132067033800 Local number 143 358 RIO YAGUEZ AND RIO GRANDE DE ANASCO BASINS Well 181233067083300 Local number 45 359 Well 181522067090900 Local number 53 359 RIO CULEBRINAS BASIN Well 182228067113300 Local number 58............. 360 Well 182032066591800 Local number 83 360 ST. CROIX, U.S. VIRGIN ISLANDS Well 174225064471900 Local number 1 372 Well 174225064472000 Local number 2 373 Well 174243064475100 Local number 3 374 Well 174245064475800 Local number 4 375 Well 174336064523200 Local number 5 375 xiv GROUND-WATER WELLS, BY BASIN, FOR WHICH RECORDS ARE PUBLISHED—Continued Page ST. CROIX, U.S. VIRGIN ISLANDS--Continued 00000000000•00••• Well 174308064484400 Local number 6.............. 376 Well 174525064460600 Local number 7 OOOOOOOOOOOOOOOOOOOOOOO ........ 377 Well 174527064460100 Local number 8........ 377 000000 000000••0 0••00000 Well 174532064460300 Local number 9 0•0e04500 ............... ....... 378 Well 174329064454700 Local number 10.............. ..... 378 ST. THOMAS, U.S. VIRGIN ISLANDS Well 182050064580400 Local number 1 379 ........000000000000 Well 182138064543100 Local number 2 .......... 379 Well 182138064542500 Local number 3 379 Well 182136064541900 Local number 4 380 Well 182029064535200 Local number 5 380 Well 182038064550300 Local number 6 381 ST. JOHN, U.S. VIRGIN ISLANDS 060060000000000 Well 182010064472600 Local number 1 ...... 382 Well 182109064460300 Local number 2 ....... 382 00000000000000 .......000 Well 182116064451000 Local number 3 383 Well 182042064454500 Local number 5 384 Well 182044064454600 Local number 6 385 Well 182044064454800 Local number 7 385 Well 182044064454900 Local number 8 385 Well 182044064455000 Local number 9............. 386 10............. .......... 6000000 Well 182044064455200 Local number 386 Well 181956064464500 Local number 11 387 1 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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 interested 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, 1985. This report includes records on both surface and ground water. Specifi­ cally, it contains: (1) Discharge records for 57 streamflow-gaging stations, 131 partial-record or miscellaneous streamflow stations, and 1 crest-stage, partial-record streamflow station; (2) stage and content records for 4 lakes and reservoirs; (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 94 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 streamf low, 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, and 1984 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-85-1". 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. WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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 The 1985 water year (October 1984-September 1985) was one of near normal precipitation. Precipitation averaged about 106 percent of normal, island- wide, with variations of 94 percent normal in the north; 109 percent normal in the south; 122 percent normal in the east; and 105 percent normal in the west. Unusual dry conditions prevailed during January and June, but May was abnor­ mally wet. Monthly average precipitation islandwide for water year 1985 and the 30-year normal as reported by the National Oceanic and Atmospheric Adminis­ tration are listed in table 1. 3 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 Table 1. Island-wide monthly precipitation averages for 1985 water year 30-year Water year 1985 normal Oct. 8.17 7.74 Nov. 10.58 5.95 Dec. 4.12 4.32 Jan. 1.42 3.08 Feb. 2.86 2.29 Mar. 5.12 2.62 Apr. 4.36 4.63 May 10.44 6.48 June 2.08 5.58 July 4.52 4.48 Aug. 5.47 7.28 Sept. 7.72 7.78 TOTAL 66.86 63.23 Surface Water Streamflow in Puerto Rico during the 1985 water year was generally above normal. It increased during November and May, but remained about normal during the rest of the year at key index stations; throughout most of the island (fig. 1). The first wet period of the water year was caused by the passage of tropical storm Klaus during the first week of November 1984 with above average precipitation and localized flooding on the north and south coasts. Stream- flow increased two to three times normal in the north and east basins. A stationary high pressure system over the Atlantic and northeastern Caribbean produced a short-term dry spell during January and February. Streamflow declined at all index stations. Monthly mean flows for February were from 20 to 28 percent below normal. This moderate drought ended during March and streamf low returned to normal. A nearly stationary low-pressure center that moved over Puerto Rico from the north caused significant amounts of rain during May 17 to 18. Precipita­ tion totals (5-days) averaging from 8 to 22 inches were recorded by the National Weather Service in north-central Puerto Rico. Severe floods occurred at several municipalities. Historical-peak flows were recorded at 14 gaging stations. The highest instantaneous peak (136,000 cubic feet per second) was recorded at the Rio Grande de Manati at highway 2 near Manati. Recorded peak discharges are listed in table 2. Streamflow decreased after the May floods, but remained in the normal range during the rest of the water year. An exception was in the east, where flow was about 40 percent of normal. 4 RIO GRANDE DE MANATI RIO GRANDE DE ANASCO NEAR SAN SEBASTIAN (50144000) AT HWY 2 (50038100) 2000 6000 1000 1000 0 0 0 La tn ct 100 taa. a▪. 1+1 100 La La c72 30 ▪ 50 0 RIO INABON AT REAL ABAJO RIO FAJARDO NEAR FAJARDO z 50112500 (50071000) a 200 400 < 100 tn tn • 100 10 O I I 10 3 -8 n 0)., 9LIZO3OCCK0-2-J10 d. 4 4 5PelIIVIrCgSI Srai 0 ia 4 la 4 1). 24 -'4"0Z0-• 21421i-0040 V3 O0 z -0 56. 2 4t —0 —0 ic 1984 1985 1985 1984 Figure 1.--Monthly mean discharge of selected streams in Puerto Rico. 5 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 In the U.S. Virgin Islands, conditions were in general the same as in Puerto Rico. The passing of storm Klaus produced the worst floods since 1983, and caused millions of dollars in damages during the week of Nov. 4-10, 1984. Table 2. Peak discharges during May 17-18, 1985 at selected U.S. Geological Survey streamflow gaging stations throughout Puerto Rico 1985 peak Previous peak Station (Cubic feet (Cubic feet Water no. per second) per second) Year 50010600 2,600 1,900 1984 50014800 3,510 2,040 1984 50015700 6,250 3,000 1984 50027750 45,800 9,310 1982 50028000 12,190 8,950 1963 50028400 15,000 4,120 1969 50031200 48,000 35,000 1970 50038100 136,000 119,000 1970 50051180 9,320 6,300 1984 50053050 11,600 2,650 1984 50055650 700 220 1984 50056400 25,700 23,300 1979 50056900 1,190 1,050 1984 50111500 12,700 357 1984 Ground Water In general, most water levels in wells rose during the first quarter of 1985 water year and during May in response to above normal rainfall. New record-high water levels were observed at several wells in Puerto Rico and the U.S. Virgin Islands (Table 3). Ground-water levels along the north coast limestone aquifers of Puerto Rico remained practically unchanged during water year 1985. A slight increase was recorded during October in response to above normal rainfall (fig. 2). The recovery was followed by a declining trend until the aquifer reached near-equilibrium conditions which is a typical response of the north coast limestone aquifers to normal rainfall. Ground-water levels along the south coast alluvial aquifers followed a cyclic pattern; the results of both rainfall and ground-water withdrawals for public supply, industrial, and irrigation uses. Above normal rainfall along the southern slopes of Puerto Rico during the first quarter of 1985 water year caused a rise in the ground-water levels (fig. 2). At the Alomar well an increase of 7.5 feet in the ground-water levels was recorded from October to December. This trend was reversed during the rest of the year in response to below normal rainfall and the increasing water demand for irrigation. WATERLEVEL INFEET BELOWLAND-SURFACE DATUM 6 282 283 284 285 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1984 1985 18 WELL 87. ALOMAR 1 22 26 NM a, 30 I I I 1 I I I I I t OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1984 1985 WELL 11, GUINEA GUT ST. JOHN, U.S.V.I. 11 19 tre""""ftem. i i . .1 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1984 1985 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, 1985 7 Ground-water levels in the U.S. Virgin Islands (St. Thomas, St. Croix, and St. John) followed a pattern similar to those within the south coast aquifers of Puerto Rico. Above normal rainfall early in November resulted in an increase of up to 16.5 feet in ground-water levels (fig. 2). Water levels declined throughout the rest of the water year due to below normal rainfall and ground-water withdrawals. In several areas of St. Thomas, St. Croix, and St. John, the ground-water levels declined about 22 feet. Table 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 Well Local Location 1985 Date Previous Date name no. extreme extreme Arroyo #1 171 PR 1.35 5-85 2.72 6-83 Squibb #3 173 PR 2.77 12-84 3.73 9-84 Humacao GW Sta 172 PR 13.70 5-85 15.73 9-84 Restaurada 8A 141 PR 11.60 11-84 15.65 8-83 Yabucoa #7 96 PR 13.38 12-84 15.52 1-82 Grade School #3 6 St. Thomas 5.19 11-84 10.56 6-83 DPW #6 5 St. John 3.20 11-84 11.34 4-83 Water Quality Water quality can be affected by any factors depending on its use and the parameters analyzed for. During the water-year 1985, nine new constitu­ ents were added to the regular surface water sampling program. At fifty-five sites, water samples were collected twice during the year for determination of boron, copper, manganese, iron, zinc, cyanide, phenols, sulfide, and methylene blue active substances (MBAS). Maximum concentrations and sampling stations are summarized in table 4. 8 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 Table 4. Sites with maximum concentration of selected parameters Boron Copper Manganese Iron Zinc B Cu Mn Fe Zn Site 50049920 50091800 50047990 50047990 50091800 Maximum Concentrations 3300 270 2400 4900 560 ug/L ug/L ug/L ug/L ug/L Cyanide Phenols Sulfide MBAS Site 50044000 50071000 50091800 50091800 Maximum 1.0 46 1.4 4.7 Concentrations mg/L mg/L mg/L mg/L The presence of high concentrations of fecal coliform (FC) and fecal streptococci (FS) bacteria continue being the principal water quality problem in the water bodies of Puerto Rico. Bacteria concentrations exceeding one million colonies per one hundred milliliters of raw water were found at several stations including the Rio Hondo at Flood Channel near Catafio (50047530), the Quebrada Blasina near Carolina (50050300), the Rio Bairoa near Caguas (50055400), and the Rio Chico at Central Providencia (50091800) (fig. 3 and 4). These sites are located close to urban zones, industrial parks and suburban zones not served by local sewage systems. Two daily suspended sediment stations were operated during the year, one at the Rio Tanamd near Utuado (50028000), located in the north central part of the island and the Rio Fajardo near Fajardo (50071000), in the east, close to the El Yunque rain forest. Maximum sediment concentrations recorded were 11,200 milligrams per liter (mg/L) at 50028000 and 1,820 mg/L at 50071000. The maximum sediment loads were 167,000 tons per day at 50028000 and 13,700 tons per day at 50071000. 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 I I 67°15' 67°00' 45' 30' 15' 66°00' 45' 65°30' I OCEAN° ATLANTIC° 0 o O ,0 40 4 \ea o be 4k „ ea 7 V _00 9 e§% / •$40 , ,. 400 0. # CP t vt ‘o ko )C1 66 66 o• e 4 be ‘,0 0q 18°30' b .,,0 4` Rio Culebrinas Rio Guayabo Rio Grand Rio Fajardo Rio Grande 15 - de Afiasco Rio Yaguez Rio Daguao Quebrada Palma Rio Guanallbo Rio Santiago Rio Blanco Rro Antoll Ruiz Rro Humacao io Guayanis 18000' 0 10 ‘66,1,4 0 I 4,1" 0 40 .0 00 ,00 41,:i),0 0 , vo co+0 4.4024 .4 Gapt to ‘0 a so stir 00 04 470 000 +120 FECAL COLIFORM8 004zot _q) ‘ik ,aoo.s!cp oo ko 0 ie _oke 0 yo e • 1000 oez OP 4 0 W0 1/0 4 ,Jett II 1000 - 10,000 tr 1/40 II 10,000 - 100,000 17°45' • 10 20 3p KILOMETERS 100,000 - 1.000,000- I O 10 20 MILES > 1,000,000 MAR CARIBE Figure 3.--Location of maximum concentration of fecal coliform bacteria at sampled sites. 45' 65°30' 67°15' 67°00' 45' 30' OCEAN° ATLANTICO 0 bo *0 10 ‘,0 p%.ibCo° 0.‘ .0 0 \ 00 e aka, , .‘o o'' '0 o, 0 ..0 o 66 0 tbC' i / 0P 4,0 041 e 1) t% 0tpe ,,0' 1 o 0 0 p p p,e 1/4° \o 6 e %). t e v> t.' te '4 3s 18°30' t 0 Ito 01 \ C' ast 4 4 so y 4 e e koe +2, ,00 Rio Culebrinas v) sp> It* 10 Rio Guayabo (I' Rio Grand Rio Grande de Afiasco 15' Rio Yaguez Rio Daguao Quebrada Palma Rio Guanajibo \ Rio Santiago Rio Blanco Rio Antolv Ruiz Rio Humacao Rio Guayana's 18000' ,0 el. ,s. 0 0 0 e '0 0 4 0 4 Cr t 0s`' v> A,Se.° 0 9' 004z FECAL STREPTOCOCCI vo° 0 A 0 4. • co 0' i*() 0 0'9 0 ye_ z' A 0 . ‘ i t. 0 00 cp ,z> ocia. 4::• 0 ‘ 1 0 0 4° A0 be L0 O 0„ko, ii., Q v) ,0 _ _ 0 it% ko to 4c.• A • < 1000 v, ov wbe 4F V 1,0 V k0 k0 t.1.,,,,,, e ,,, t 4t. * ik t $0 0 1000 - 10,000 ke cf R. 10.000 - 100,000 to ‘2.• • > 17°451 O 10 20 30 KILOMETERS • 100,000 - 1,000,00 O 10 20 MILES 1,000,000 MAR CARIBE Figure 4.--Location of maximum concentration of fecal streptococci bacteria at sampled sites. 11 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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 1985 water year that began October 1, 1984 and ended September 30, 1985. 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 5-11. The following sections of the introduc­ tory 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. 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." N• 67°15' 67000' 45' 30' 15' 66°00' 45' 65°30' OCEANO ATLANTICO o`o‘o be o ('. 00 b6 ok0 „A O• ti e OJ Go /". t16 e to 0 f1/0 4 e 1/40 4S% ‘7 18°30' 4r, ae 1/40 -16.1010401 1/40° e4 it e444 ike.6 6 0 0114 0157 easo , ZP 0381 395 R(o Culebrinas 1 /40 0112 027750 0469 1 /40 R(o Guayabo 028 1478 R(o Grand 32 0670 014 Igo Fajardo 0350 (*Al 0618 1:35 655 1440 I 028 •. 4 0 07 • RI° Grande 057 15 05565 de Afiasco 0 06 1 1 14 1 0.5 / 0564 76 • Rfo Yaguez R(o Daguao 141 06 14 Quebrada Palma R(o Guanajibo 1380 1360 0430 '053050 05 3 filo Santiago 05118 ' • 82 • Rio Bianco 1 5• 11 5 05+9 Rio Anton Ruiz 05115 Rio Humacao 12 80 106 1 4 RIO Guayana's 0905 18°00' £129899,129 1 5 0 6 i sy ‘to.k,s I 1 s• .P oi i 0 s0 Go a0 ,c 6 6 4,6 se A` 6b o 0A° 0 aN o 0 4 6 4 cr t- A ‘5) A, of 4,0 4a* • ,0 _to IP s v q pv SO 0% 'b AVQ 0 i Itir V' 0 c0 0 GO 1/40 r EXPLANATION 14$ V. CP k0VAIP it,P140 0 ‘ V, g. . 1. et• 1/4o be 0 O 4i. P1/40 46 ko b 42 Q` v 1/0 4 41' 1/40 ‘0 4 take 14 4 Pe t ko SURFACE WATER STATIONS i‘ ftk 4 1/0 4 Cttoga 1/40 CONTINUOUS STREAMFLOW £1 1 25 17°4e 10 20 30 KILOMETERS STATION 20 MILES MAR CARIBE I Figure 5.--Location of continuous surface-water stations in Puerto Rico. 10 67°15' 67°00' 45' 30' 15' 66°00' 45' 65°30' OCEANO ATLANTICO e I AO 00 %.6 W er \0 4% 14 e 0,e0.o 4 A 0 / cP , 0 • 11‘b 440 4, osit b • e be 0390 p e 18°30' .0 0• 0114 • 1%, 0290 38 0395.147530 4144. Culebrinas • 4982 • r 0381 0469 011• Rfo Guayabo 1491 48510 0491 3r• -E• Rto Grand 0107 0 06 s.9 84799 • 10720 027250 0383'0 44 0 059 O 7090 0725 4 Rto Falardo 1 76 0 44 0588 035 280 51 0 554 144 fito Grande 3 O 50 0575 07 0 430 10 • de Masco 55250 15 60 02.0 025 • 47 1 88 02 0307 055 11(0 Yaguez Rto Daguao Quebrada Palma Rto Guanapbo 136 02 \ Igo Santiago 13 0 0430 O 0 5 Rib Bianco 1 4 leo Antal? Ruiz 133 03995 8.5 RIO Humacao 1 • 65 03 to Guayane's I 1' 1'47 L 18°00' 1 60, b ' s EXPLANATION 00 00 A 440.0 44 cd. .0 04 c, so,0. 0 A 4e. ikce> 43 04,‘ 100 440 de cp p am QUALITY-OF-WATER STATIONS p‘" dm 0A0 ii. q v. et ) 0 , qa f t q$. „SO 411/4 v ko v %co 440 q. se1/0 4 ep q: V 0430 BIOLOGICAL ik ik 0 • 443 7 0820 CHEMICAL 4%0 17°45'- • 10 20 30 KILOMETERS -V 0710 SEDIMENT (DAILY) 1 O 10 20 MILES MAR CARIBE Y-0910 SEDIMENT (BI-MONTHLY) Figure 6.--Location of water-quality stations in Puerto Rico. 14 66°00' 65°45' SAN JUAN 56 e • t0 0475.25 et• %4 0496 5.08. 0493.10 503 0490 665 0693.50 0485.10 0690 / 0600 047 02 0475.04 Fajardo 0590 is Fajardo 6 0727 0584 0554.10 0729 180 553.1 15' 0 29 0527 0535 0740.10 07 7 5 0511.40 0787 053. 5 Rio Antoit Ruiz RiO Humacao EXPLANATION 27 SURFACE WATER STATIONS 082 A0825 LOW-FLOW STATION 0 19.50 4-1159 CREST-STAGE 0845 GAGING STATION 0457 0872 0871 180 442 0915 , 0850 0851 00' 18 01143 0010 446 P478 )01145.20 044 41 40 0045.10 V.% 0 5 10 20 KILOMETERS Al ,o 5 10 20 MILES Figure 7.--Location of low-flow partial-record stations in Eastern Puerto Rico. 67°15' 18°30' Rio Culebrinas Rio Guayab Rio Grand Rio Grande - de Aliasco 15 Rio Yagu Rio Guanajibo 18°00' 17'0451 0 10 20 0 10 67°00' 30' 15' 66°00' 45' 65°30' 1 OCEAN° ATLANTIC° ici, IP i 4k t,0 0 bP\ 0 e 2$0 #0 000V 0.016 •0 tbdk _ ,A ?,,0 OJ Cie 0.0 0 e 4s0 .+ p e be .• t b V) , V) 0 Rio Fajardo Rio Daguao Cluebrada Palma Rio Santiago Rio Bianco Rio Antoli Ruiz Rio Humacao Rio Guayana's k ,ifar 0.0 00%• 06 0 ik or 00 6 s, ‘P 4 0 6 0 *tf> 4 0 0 4 Go t 0 0 Ao oo .10 ‘ 4 o0 Ao„0i ‘0,000 ° r (k0 0S 0 ko b 0 riko Ao \0 5 VkoN wA0001/40 izi, C' GO vzt Ow * e, b dik 4,0 tLk0 44Z V) 0 4%0 e 30 KILOMETERS 20 MILES MAR CARIBE Figure 8.--Location of low-flow partial-record stations in Central and Western Puerto Rico. Lis • • 15 45' 65°30' 67015' 67°00' 5' 30' 15' 66°00' OCEANO ATLANTICO .^ 40 0 • %IP 0 QU4:4O Abe o be \ ,,p os• O° ike ,:sw,p 0 / OJ C.,9" e 1, 0 40 N,+- 168p 151 ,06e ae ":3 e q4 Q"0b 169 41* 18°30' 69skt to 164 13 • • . 161 71• 68 00 6 • .165 150 Rio Culebrinas 16 ; 15 6 Rio Guayabo 58 6 Rio Grand 142° 83 Rio Fajardo Rio Grande 52 de /Masco 50 t Rio Yaguez 123 42 Rio Daguao 43 86 0 Quebrada Palma Rio Guanajibo 37 172 40 \ Rio Santiago 3 Rio Bianco 0 1 96 33 Rio Antoll Ruiz Rro Humacao 144 31 Rio Guayanis ;143 27 w88 e 134 87 • 19 1 122 5 14 • • 18°00 13 74 124 2 1 01 I 4 4,07: Se. 0- e04' ,'¢4 o 00 c,O Ao „o 01b * 0 + or c7 vr.t4 0 ,o,t 145 0 0 090 +0 p © -% Doti ‘o 0 o1> c, to 147 cp o o ko 0, no ga. e +be 1/40 A0 ik p \c, P,0 4c., co 4 p 1 46 co +be i1/ 4 4.41/4 i1/4 8 t 441/4 4:i;% t to co CO EXPLANATION 17°45' 0 10 20 30 KILOMETERS .2 WELL AND WELL NUMBER 0 10 20 MILES MAR CARIBE Figure 9.--Location of ground-water stations in Puerto Rico. 18°24 9 18c20' 84?50' 4 4°4 ST. JOHN 18°22' 0 4 KILOMETERS 180 1 0 4 MILES 64°50' 45' 40' ST. CROIX Christiansted 4 KILOMETERS 0 1 2 3 4 MILES Figure 10.--Location of surface-water stations in the U.S. Virgin Islands. 18 65°05' 65°00' 55' 64°50' 18°24' — ST. THOMAS 18°20' 0 1 2 3 4 KILOMETERS I I I I I 0 1 2 3 4 MILES 64°50' 45' 64°40' 18°22' 18°18' 64°50' 45' 40' 64°35' 17°45' 17°40' Figure 11.--Location of ground-water stations in the U.S. Virgin Islands. WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 19 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. 12, below). 66°53' 52' 51' 50' 49' 48' 66047' 18°02 01' 134 132.4 lb 131 .27 .74 COORDINATES FOR WELLS 27 (180150066474900) „V AND 74 (180135066471000) COORDINATES FOR WELLS 132 (180133066503300) AND 134 (180120066503200) 18 °0T COORDINATES FOR WELL 131 (180058066502700) 17 °59 016 A.' COORDINATES FOR WELL 16 (175922066495800) Figure 12.--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 contained 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 report. Location of all complete-record and crest-stage partial-record stations for which data are given in this report are shown in figures 5,7,8, and 10. 20 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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. 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. WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 21 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 deposi­ tion of sediment in a lake or reservoir, periodic resurveys may be necessary to redefine the relationship. Even when this is done, the contents computed may become increasingly in error as time since the last survey increases. Discharges over lake or reservoir spillways are computed from stage-discharge relationships much as other stream discharges are computed. 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. 22 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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. 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. WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 23 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. 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" given the sum of the daily figures. The line headed "MEAN" given 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. 24 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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. 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. 25 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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. 26 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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 Network (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 (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. 27 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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 Doraville, Ga., or Denver, Co. 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. Tables of "daily values" of specific conductance, pH, water temperature, dissolved oxygen, and suspended sediment then follow in sequence. 28 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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. WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 29 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) L 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 12. 30 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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 fifth day and the end of each month (eom). 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. INSTRUMENTATION.--This paragraph provides information on both the fre­ quency of measurement and the collection method used, allowing the user to better evaluate the reported water-level extremes by knowing whether they are based on weekly, monthly, or some other frequency of measurement. 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. 31 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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, only abbreviated tables are published; generally, only water-level lows are listed for every fifth day and at the end of the month (eom). The highest and lowest water levels of the water year and their dates of occurrence are shown on a line below the abbreviated 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 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. 32 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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 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 were obtained by trained personnel. The wells sampled were pumped long enough to assure that the water collected came directly from the aquifer and had 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 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 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 33 DEFINITION OF TERMS Term-s 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 rodlike, or spiral and threadlike in shape, often clumped into colo­ nies. 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. 34 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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. Fecal 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 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). WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 35 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. 36 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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 = ---log2 17— n i=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. WATT'S RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 37 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. 38 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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)...0. .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. 39 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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. 40 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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. -12 Picocurie (PC, pCi) is one trillionth (1 X 10 ) 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. 41 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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 tyle [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 is 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 Sime [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. 42 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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. 7-day 10-year low flow (7 Q10) is the discharge at the 10-year recurrence interval taken from a frequency curve of annual values of the lowest mean dis­ charge for 7 consecutive days (the 7-day low flow). WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 43 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. 44 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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 Animal Phylum Arthopoda Class Insecta Order Ephemeroptera Family Ephemeridae Genus Hexagenia Species 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. WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 45 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 precipitations 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). 46 WATER RESOURCES FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1985 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. PUBLICATIONS ON TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS 47 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, Branch of Distribution, 604 South Pickett St., Alexandria, VA 22304 (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 01. 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 02. 1976. 24 pages. 2-01. 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 01. 1974. 116 pages. 2-El. Application of borehole geophysics to water-resources 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 Davidian: USGS--TWRI Book 3, Chapter A15. 1984. 48 pages. 3-B1. 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. 3-83. 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. 48 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. 441. Low-flow investigations, by H. C. Riggs: USGS--TWRI Book 4, Chapter 81. 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. 4-83. Regional analyses of streamflow characteristics, by H. C. Riggs: USGS--TWRI Book 4, Chapter B3. 1973. 15 pages. 4-01. Computation of rate and volume of stream depletion by wells by C. T. Jenkins: USES--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. 5-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: USUS-- 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. E. Novak: USGS--TWRI Book 8, Chapter B2. 1968. 15 pages. Surface and Quality-of-Water Records for Puerto Rico 51 ATLANTIC OCEAN ISABELA 0114 QUEBRADILLAS de AGUADIL LA • 165 112 0110 010790 Drainage boundaries indeterminate in limestone terrane Logo de Guojoroco 010720 Limestone Igneous and sedimentary rocks 0106 LARES 01 fb'a Culebrina basin Rio Grande de Aiiasco basin EXPLANATION A 0106 SURFACE—WATER STATION AND NUMBER V 0105 QUALITY—OF—WATER STATION AND NUMBER V 0720 QUALITY—OF—WATER PARTIAL RECORD STATION AND NUMBER • 164 WELL AND WELL NUMBER ,Map area 4 5 KILOMETERS 5 MILES Figure 13.--Rio Guajataca basin. I I I 52 RIO GUAJATACA BASIN 50010500 RIO GUAJATACA AT LARES, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°18'01", long 66°52'24", at bridge on Highway 111 (k 32.9), 0.1 mi (0.2 km) upstream from Quebrada Anon, and 0.4 i (0.6 km) northeast of Lares plaza. DRAINAGE AREA.--3.16 sq i (8.18 sq km). PERIOD OF RECORD.--Water years 1958-71, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 31... 09:60 4.3 245 8.1 20.0 2.1 8.3 95 13 K900 K1100 FEB 1985 05... 11:15 1.7 241 7.9 21.0 1.0 7.6 87 27 2800 5400 MAR 13... 12:16 1.1 239 7.3 23.0 6.0 6.1 73 10 3100 K1300 MAY 15... 12:10 0.78 302 7.7 24.5 0.8 9.0 111 24 5300 K1200 JUL 31... 10:40 2.2 276 8.1 23.6 2.8 8.6 103 <10 9600 1400 MAGNE- SODIUM POTAS- ALKA- CHLO- HARD- NESS CALCIUM DIS- SIUM, DIS- SODIUM, DIS- AD- SORP- SIUM, DIE- LINITY FIELD SULFIDE SULFATE DIE- RIDE, DIS- DATE (MG/L AS CACO3) SOLVED (MG/L AS CA) SOLVED (MG/L AS MG) SOLVED (MG/L AS NA) TION RATIO SOLVED (MG/L AS K) (MG/L AS CAC03) TOTAL (MG/L AS 8) SOLVED (MG/L AS SO4) SOLVED (MO/L AS CL) OCT 1984 31... 92 27 6.0 12 0.6 1.8 97 6.6 8.9 FEB 1985 05... 92 26 6.5 13 0.6 2.1 98 <0.5 8.8 12 MAR 13... 93 MAY 16... 130 40 6.8 14 0.6 2.6 130 <0.6 16 12 JUL 31... 107 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 FENDED (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 1984 31... <0.1 30 150 1.8 3 <0.01 1.50 <0.01 FEB 1986 05... 0.3 30 160 0.72 2 0.86 0.04 0.90 0.11 0.39 MAR 13... 6 0.86 0.04 0.90 0.07 0.83 MAY 15... 0.2 28 200 0.41 5 0.75 0.05 0.80 0.08 0.02 JUL 31... 16 0.96 0.04 1.00 0.05 0.45 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 1984 31... 0.2 1.7 7.5 0.08 FEB 1985 05... 0.5 1.4 6.2 0.15 2 <100 <20 1 <1 <10 MAR 13... 0.9 1.8 8.0 0.04 MAY 16... 0.1 0.9 4.0 0.07 5 <100 20 1 2 <10 JUL 31... 0.6 1.5 6.6 0.08 K = non-ideal count RIO GUAJATACA BASIN 53 50010500 RIO GUAJATACA AT LARES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1984 31... FEB 1985 05... 170 <1 40 0.2 <1 <1 30 <0.01 1 0.03 MAR 13... 0.1 -- MAY 15... 180 5 50 <0.1 <1 <1 40 <0.01 3 0.05 JUL 31 I I I I I RIO GUAJATACA BASIN 54 50010600 RIO GUAJATACA ABOVE LAGO GUAJATACA, PR LOCATION.--Lat 18°19'57", long 66°55'29", Hydrologic Unit 21010002, 125 ft (38 ) off road 451, 3 i (5 km) south of Lago Guajataca, 1.0 mi (1.6 km) east of Eneas and 2.0 mi (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 (172.5 ), from topographic map. REMARKS.--No estimated daily discharges during water year. Records fair. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,600 cu ft/a (73.6 cu m/s), May 18, 1985, gage height, 12.03 ft (3.667 m), fro rating curve extended above 100 cu ft/s (2.83 cu m/s) on the basis of step-backwater analysis; minimum discharge, 2.6 cu ft/a (0.074 cu m/s), Feb. 22, Aug. 5, 6, 1985. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 cu ft/s (42.5 cu m/s) and maximum (S): Discharge Gage height Discharge Gage height Date Time (ou ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (a) Apr. 10 1715 1,720 48.7 10.45 3.185 May 18 1145 *2,600 73.6 *12.03 3.667 May 7 1615 1,680 47.6 10.38 3.164 June 25 1700 2,000 56.6 10.99 3.350 Minimum discharge, 2.6 cu ft/s (0.074 ou /s), Feb. 22, Aug. 5, 6. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 39 63 8.9 6.3 5.2 4.4 7.0 7.4 11 18 4.4 8.3 2 32 22 8.5 5.7 4.8 8.9 6.6 8.5 13 17 4.2 7.8 3 27 109 8.9 5.5 3.8 8.1 5.6 45 12 14 3.4 22 4 24 53 8.9 5.5 3.8 5.5 5.5 21 12 12 3.9 12 5 209 33 8.5 6.3 3.7 4.2 5.1 18 10 9.5 3.7 6.6 6 156 40 7.8 6.1 4.2 5.0 4.9 36 9.0 9.2 130 35 7 78 55 7.5 8.3 4.1 5.4 5.0 235 22 8.3 55 27 8 42 51 7.8 5.7 4.3 4.8 4.9 80 16 9.4 35 12 9 37 66 7.5 5.2 4.7 4.7 53 38 33 22 23 14 10 30 38 7.5 5.1 4.3 36 265 24 39 23 17 18 11 24 33 8.5 5.2 4.3 23 128 18 125 13 14 20 12 165 25 7.5 5.2 4.7 6.4 106 16 60 8.6 16 13 13 83 22 7.1 5.0 4.3 5.4 67 17 22 7.6 29 14 14 65 22 7.1 5.3 4.9 6.5 28 18 24 6.6 54 14 15 160 25 6.8 5.3 4.9 4.6 18 12 32 20 28 13 16 82 18 7.5 4.5 4.6 4.4 14 9.8 44 37 12 12 17 45 16 11 4.7 4.3 4.5 11 106 61 79 11 17 18 61 15 9.3 6.4 4.2 4.3 14 792 79 233 9.2 88 19 232 15 7.5 6.1 4.1 4.5 15 235 58 96 6.9 218 20 124 14 7.1 5.2 4.0 47 13 107 42 35 5.8 79 21 83 13 6.2 4.5 3.5 55 21 63 30 21 7.1 39 22 45 12 7.3 4.3 3.2 30 37 46 20 15 6.3 27 23 36 12 6.7 4.5 3.9 16 28 40 22 18 5.0 65 24 29 11 15 4.7 5.7 8.7 19 34 26 13 4.3 66 25 24 11 7.6 4.5 4.0 7.8 13 28 308 9.7 34 36 26 20 11 6.6 4.6 4.9 12 13 24 108 8.5 18 20 27 17 10 8.8 4.5 4.7 24 9.4 19 42 8.9 20 37 28 28 10 9.8 4.6 5.7 16 8.7 17 28 7.3 9.6 23 29 22 11 6.4 4.1 --- 12 7.8 16 21 15 6.8 16 30 16 9.7 6.3 4.2 8.5 7.7 14 18 8.6 36 23 31 100 --- 6.7 4.3 7.2 --- 13 --- 5.3 19 --- TOTAL 2135 845.7 248.6 161.4 122.8 394.8 941.2 2157.7 1347.0 808.5 631.6 1002.7 MEAN 68.9 28.2 8.02 5.21 4.39 12.7 31.4 69.6 44.9 26.1 20.4 33.4 MAX 232 109 15 8.3 5.7 55 265 792 308 233 130 218 MIN 16 9.7 6.2 4.1 3.2 4.2 4.9 7.4 9.0 5.3 3.4 6.6 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 4230 1680 493 320 244 783 1870 4280 2670 1600 1250 1990 WTR YR 1985 TOTAL 10797.0 MEAN 29.6 MAX 792 MIN 3.2 CFSM .00 IN. .00 AC-FT 21420 RIO GUAJATACA BASIN 55 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 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (MHOS) (DEG C) FEB, 20 1400 4.0 336 23.0 SEP, 12 1455 13.0 363 24.5 MAR, 06 1035 4.7 360 22.5 I RIO GUAJATACA BASIN 56 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 ka) southwest of Segunda Unidad Baldorioty de Castro, and 5.3 i (8.5 ka) south of Quebradillas Plaza. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1958-64, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 20... 11:30 310 7.6 25.0 0.8 1.3 16 23 18 95 JAN 1985 25... 10:25 70 316 7.8 24.0 3.6 49 17 <1 K1 MAR 29... 09:15 55 307 7.6 25.0 1.5 4.3 53 12 76 98 MAY 16... 09:55 289 7.9 25.5 1.0 3.6 46 16 37 K12 AUG 02... 12:30 310 7.7 26.5 1.6 0.9 11 12 K130 K30 HARD- MAGNE- SODIUM POTAS- ALKA- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE NESS NONCAR- DIS- DIS- DIS- BORP- DIS- FIELD SULFIDE DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L TOTAL SOLVED DATE AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS S) AS SO4) NOV 1984 20... 150 3 56 3.0 4.4 0.2 1.4 149 9.6 JAN 1985 25... 150 3 54 3.5 5.3 0.2 1.6 146 <0.5 9.2 MAR 29... 143 MAY 16... 140 4 48 3.7 5.7 0.2 1.6 131 10 AUG 02... 134 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) NOV 1984 20... JAN 1985 25... MAR 29... MAY 16... AUG 02... 6.4 0.1 7.9 0.1 8.9 0.1 5.5 180 2 <0.01 0.30 0.11 4.4 170 33 <1 <0.01 0.10 0.03 3 0.03 <0.10 <0.01 4.6 160 2 <0.01 <0.10 <0.01 11 <0.01 <0.10 0.02 0.38 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 1984 20... JAN 1985 25... MAR 29... MAY 16... AUG 02... 0.1 <0.1 0.6 0.4 0.4 0.4 1.8 <0.01 <0.01 2 <100 <20 1 6 <10 <0.01 0.13 <1 <100 <20 1 <1 <10 0.02 K = non-ideal oount RIO GUAJATACA BASIN 57 50011000 CANAL PRINCIPAL DE DIVERSIONRS AT LAGO DE GUAJATACA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1984 20... JAN 1985 25... 210 1 80 <0.1 <1 <1 20 <0.01 <1 0.03 MAR 29... <0.1 MAY 16... 100 1 120 0.1 <1 <1 10 <0.01 9 0.03 AUG 02... I I 58 RIO GUAJATACA BASIN 50011200 RIO GUAJATACA BELOW LAGO GUAJATACA, PR LOCATION.--1.at 18024'01", long 66°55'40", Hydrologic Unit 21010002, on left bank, 250 ft (76 a) downstream from bridge on Highway 476, 1,000 ft (305 m) downstream from outlet tunnel, and 5.2 i (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 n), from topographic map. REMARKS.--Estimated daily discharges: Apr. 17 to May 15. Records fair except those for estimated daily discharges, 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, 624 cu ft/s (17.7 cu /s), Oct. 11, 1984, gage height, 10.06 ft (3.066 a), from rating curve extended above 400 cu ft/s (11.3 cu m/s) on basis of step-backwater analysis; minimum discharge, 0.53 cu ft/s (0.015 cu m/s), May 31, June 1, 1984. EXTREMES FOR CURRENT YEAR.--Maximum discharge, 624 cu ft/s (17.7 cu m/s), Oct. 11, gage height 10.06 ft (3.066 a); minimum discharge, 0.78 cu ft/s (0.022 cu m/s), Mar. 19, Apr. 8. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 122 1.9 1.4 1.7 1.3 1.1 .90 1.0 2.1 453 1.8 1.2 2 342 2.7 1.4 1.6 1.2 1.0 .87 1.2 2.0 352 1.7 1.2 3 341 2.3 1.4 1.5 1.2 .99 .86 3.0 2.1 98 1.4 1.2 4 341 2.0 1.4 1.6 1.3 .94 .86 1.5 2.4 1.9 1.3 1.2 5 188 1.9 1.4 1.5 12 .94 .82 1.0 2.3 1.6 1.4 1.3 6 164 1.9 1.6 1.4 1.3 .94 .82 1.0 2.5 1.6 1.6 1.2 7 504 2.4 1.6 1.4 1.3 .94 .82 2.0 2.1 1.5 2.0 1.2 8 501 2.0 1.3 1.4 1.3 1.1 .79 10 2.0 1.5 1.5 1.2 9 489 1.8 1.3 1.5 1.2 1.0 1.4 2.2 2.4 1.7 2.4 1.2 10 430 1.7 1.3 1.5 1.1 1.5 2.0 1.4 2.0 1.6 1.5 1.7 11 349 1.7 1.4 1.5 1.1 1.2 3.2 1.3 2.0 1.9 1.4 2.2 12 384 1.7 1.4 1.5 2.5 34 1.3 1.4 1.9 1.6 1.4 1.9 13 384 1.7 1.3 1.4 1.4 34 .98 1.4 1.8 1.5 1.6 1.7 14 387 1.7 1.3 1.4 1.4 1.0 .98 1.8 1.8 1.5 1.5 1.4 15 385 1.8 1.3 1.2 1.2 .99 .95 1.6 1.8 2.0 1.4 1.4 16 384 1.7 1.2 1.3 1.1 .89 .94 1.6 1.8 2.0 1.4 1.6 17 383 1.8 1.3 1.3 1.1 .82 .92 3.4 1.8 2.6 1.4 1.6 18 155 1.7 1.3 1.5 1.0 .82 1.1 4.2 1.7 3.0 1.4 1.9 19 3.0 1.7 1.3 1.3 1.0 .80 1.2 2.3 2.1 1.8 1.5 2.2 20 4.3 1.7 1.4 1.3 1.1 2.9 1.0 2.1 4.1 1.5 1.3 1.7 21 3.3 1.7 1.4 1.3 1.1 1.4 1.2 2.0 2.9 1.5 2.9 1.5 22 247 1.6 1.6 1.4 1.1 .98 2.4 1.9 2.0 1.6 2.0 1.5 23 397 1.6 1.3 1.3 1.0 .95 1.4 1.9 1.7 1.9 1.3 236 24 142 1.5 1.4 1.4 1.4 .94 1.1 2.0 3.0 1.7 1.0 407 25 422 1.5 1.3 1.4 1.2 .94 1.0 2.0 2.4 1.5 1.0 392 26 27 387 326 1.5 1.5 1.5 1.6 1.3 1.2 1.3 1.1 .94 1.3 1.0 1.0 2.0 2.0 78 378 1.5 1.5 1.1 1.2 125 1.4 28 29 30 326 151 3.6 1.5 1.4 1.4 1.7 1.5 1.4 1.2 1.4 1.3 1.1 --- 1.1 1.2 1.0 1.0 1.0 1.0 2.1 3.2 2.0 462 458 456 1.4 1.4 1.4 1.1 1.1 2.5 1.3 8.5 2.2 31 1.8 --- 2.3 1.3 .95 --- 2.2 --- 1.3 1.3 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 8647.0 279 504 1.8 .00 .00 17150 53.0 1.77 2.7 1.4 .00 .00 105 44.3 1.43 2.3 1.2 .00 .00 88 43.3 1.40 1.7 1.2 .00 .00 86 45.4 1.62 12 1.0 .00 .00 90 99.57 3.21 34 .80 .00 .00 197 34.81 1.16 3.2 .79 .00 .00 69 68.7 2.22 10 1.0 .00 .00 136 1886.7 62.9 462 1.7 .00 .00 3740 950.5 30.7 453 1.3 .00 .00 1890 47.4 1.53 2.9 1.0 .00 .00 94 1206.6 40.2 407 1.2 .00 .00 2390 WTR YR 1985 TOTAL 13127.28 MEAN 36.0 MAX 504 MIN .79 CFSM .00 IN. .00 AC-FT 26040 RIO GUAJATACA BASIN 59 50011200 RIO GUAJATACA BELOW LAGO GUAJATACA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1984 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TUBE DATE TIME INSTANTANEOUS DUCTANCE TUBE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) FEB, 20 1111 1.1 408 25.0 SEP, 12 1209 1.9 375 26.5 MAR, 06 0840 0.9 437 24.6 I I I RIO GUAJATACA BASIN 60 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 from bridge on Highway 2, 1.6 mi (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 a), fro topographic map. REMARKS.--Estimated daily discharges: Oot. 1-9; Nov. 12-18, 27, 30; Dec. 1, 15-31; Jan. 1, 7-31; Feb. 1-4, 7-18, 23-26; Mar. 2, 3, 6, 7, 27-29; Apr. 2-8, 20; May 2, 3, 7; Sept. 5-9, 13-25. Records fair except those for estimated daily discharges, which are poor. Flow regulated by Lago Guajataca 6.6 mi (10.6 ka). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 3,090 cu ft/s (87.5 cu a/s), Sept. 19, 1984; minimum discharge, 6.2 cu ft/s (0.176 cu m/s), Sept. 4, 9-12, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 cu ft/s (28.3 cu /s) and maximum (5); Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (a) Date Time (cu ft/s) (cu m/s) (ft) (a) Oct. 9 1545 1,350 38.2 5.43 1.655 Oct. 14 1900 52,110 59.8 *6.62 2.018 Oct. 12 2246 1,040 29.5 4.83 1.472 Oct. 22 2030 1,130 32.0 4.81 1.466 Oct. 13 1615 1,450 41.1 5.61 1.710 June 28 1015 1,500 42.5 5.69 1.734 Minimum daily discharge, 7.7 ou ft/s (0.218 ou /a), Feb. 17. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 700 20 17 13 8.8 10 13 16 19 1040 15 12 2 680 19 16 13 8.8 10 13 16 17 701 15 11 3 680 22 16 12 9.0 11 13 17 17 107 13 11 4 680 25 16 12 9.3 11 13 17 19 16 13 12 5 450 21 15 12 9.0 11 13 16 22 15 12 12 6 340 20 15 12 9.5 11 13 16 17 14 13 12 7 1100 22 16 11 9.3 11 14 18 19 14 14 12 8 1100 22 16 11 8.8 12 14 135 14 15 18 11 9 1200 23 16 10 8.6 12 14 19 14 15 12 11 10 1040 24 16 10 8.8 16 22 16 14 16 13 11 11 403 61 14 10 8.6 12 103 15 15 17 12 13 12 722 76 15 9.8 8.6 19 117 17 14 26 11 12 13 966 26 14 9.8 8.4 51 19 15 13 18 12 10 14 1260 25 14 9.5 8.4 26 14 26 14 18 12 9.8 16 1100 25 14 9.5 8.2 13 14 20 14 19 13 9.3 16 864 24 14 9.3 7.9 13 13 19 14 27 12 9.3 17 755 23 14 9.0 7.7 13 12 79 15 31 11 9.5 18 428 22 14 9.0 11 13 14 298 15 43 22 9.7 19 39 20 14 8.8 8.5 13 13 233 15 84 13 9.7 20 40 20 14 8.6 8.2 20 15 67 16 24 11 10 21 32 19 14 8.6 8.4 126 30 26 25 20 12 10 22 343 19 13 8.4 8.6 30 23 22 14 19 28 10 23 899 19 13 8.6 8.6 18 18 19 13 19 13 210 24 191 19 13 8.4 8.8 15 16 18 13 19 11 800 25 851 19 13 8.4 8.8 16 14 17 58 18 11 720 26 753 18 13 8.4 9.3 14 14 17 145 18 11 256 27 364 18 13 8.4 9.5 14 14 17 850 18 12 12 28 376 18 13 8.6 9.8 14 14 17 1460 17 17 8.9 29 282 17 13 8.4 --- 24 14 17 1290 17 11 80 30 21 17 14 8.6 15 15 16 1110 16 17 105 31 19 --- 13 8.8 14 19 --- 15 15 --- TOTAL 18678 723 445 302.9 247.2 607 648 1280 5295 2456 425 2429.2 MEAN 603 24.1 14.4 9.77 8.83 19.6 21.6 41.3 177 79.2 13.7 81.0 MAX 1260 76 17 13 11 126 117 298 1460 1040 28 800 MIN 19 17 13 8.4 7.7 10 12 15 13 14 11 8.9 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 37050 1430 883 601 490 1200 1280 2540 10500 4870 843 4820 WTR YR 1985 TOTAL 33536.3 MEAN 91.9 MAX 1460 MIN 7.7 CFSM .00 IN. .00 AC-FT 66520 I RIO GUAJATACA BASIN 61 50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water year 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- P11 TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 20... 18:20 20 480 7.9 25.0 1.5 9.4 114 20 K180 1000 JAN 1985 25... 15:10 E0.0 497 7.7 26.0 15 8.7 105 15 K35 K32 MAR 22... 09:16 25 376 7.5 23.0 1.5 6.7 78 15 K11000 7200 MAY 16... 13:30 18 473 8.1 24.5 2.0 7.5 90 <10 K170 190 AUG 03... 09:45 12 460 7.8 25.5 1.2 6.7 81 <10 K110 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, NESS NONCAR- DIS- DIS- DIS- SORP- DIS- FIELD SULFIDE DIS- DIS- (MG/L BORATE SOLVED SOLVED SOLVED TION SOLVED (MG/L TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/L (MG/L RATIO (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 1984 20... 220 14 74 7.8 17 0.5 1.0 203 9.1 31 JAN 1985 25... 240 6 81 8.8 11 0.3 0.6 233 <0.5 4.6 20 MAR 22... 155 MAY 16... 200 13 68 6.3 13 0.4 1.8 183 <0.5 13 23 AUG 03... 192 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 1984 20... <0.1 6.3 270 14 2 1.89 0.01 1.90 0.07 0.03 JAN 1985 25... <0.1 6.4 270 2 <0.01 2.20 0.03 2.4 MAR 22... 11 MAY 16... <0.1 6.2 240 12 5 1.79 0.01 1.80 0.04 0.46 AUG 03... <0.01 1.50 0.02 0.28 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 1984 20... 0.1 2.0 8.9 <0.01 JAN 1985 25... 2.4 4.6 20 <0.01 <1 (100 30 1 a <10 MAR 22... MAY 16... 0.5 2.3 10 <0.01 <1 <100 20 1 <1 <10 AUG 03... 0.3 1.8 8.0 <0.01 K = non-ideal count 62 RIO GUAJATACA BASIN 50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS 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 1984 20. JAN 1985 25... 220 1 <10 0.2 <1 <1 20 <0.01 1 0.03 MAR 22... 0.1 MAY 16... 250 5 20 <0.1 <1 <1 10 <0.01 3 0.04 AUG 03... 63 ATL ANTIC OCEAN OUEBRADILLAS s • CAMUY HATILLO s 0158 111 ARECIBO 0157 0148 Drainage boundaries indeterminate in limestone terrane . Bayoney River underground LARES N c's Limestone Igneous and sedimentary racks Rio Gdoiatoco ).`4.) baem Rio Tonarea.. Rio Grande de Arecibo basin UTUADO a Rio Grand* de \ Ana.° basin \ Drainage boundary EXPLANATION A 0148 SURFACE-WATER STATION AND NUMBER 0158 LOW-FLOW STATION AND NUMBER ,Map area SAN JUAN "Ilto ) .ttlIt,-U. turret.° re..inetx, c.).1. ASANVEZ CRAW/ 8. 5 KILOMETERS 5 MILES Figure 14.--Rio Camuy basin. I I 64 RIO CAMUY BASIN 50014800 RIO CAMUY NEAR BAYANEY, PR LOCATION .--Lat 18023'48", long 66°49'04", Hydrologic Unit 21010002, on left bank at Highway 488, 1.4 mi (2.2 km) southeast of school at Santiago, 0.9 mi (1.4 km) northwest from Eacuela Manuel A. Rivera at Bayaney and 9.1 mi (14.6 ka) 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 a), fro topographic map. REMARKS.--Estimated daily discharges: Oct. 1, 2. Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 3,510 cu ft/s (99.4 oil /s), May 18, 1985, gage height, 14.42 ft (4.395 m), from rating curve extended above 300 cu ft/s (8.50 cu m/s) on basis of step-backwater analysis; minimum discharge, 30 cu ft/s (0.85 cu m/s), Mar. 1-4, 1985. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 cu ft/s (28.3 cu m/s) and maximum (t): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (a) Date Time (cu ft/a) (cu m/s) (ft) (m) Oct. 5 1500 1,200 34.0 9.24 2.816 May 18 1800 $3,510 99.4 $14.42 4.395 Oct. 6 1415 1,220 34.6 9.30 2.835 July 18 2115 1,780 50.4 10.86 3.310 Oct. 15 1515 1,220 34.6 9.28 2.829 Sept. 17 2130 1,220 34.6 9.29 2.832 Oct. 31 2300 1,720 48.6 10.70 3.261 Sept. 18 2030 1,780 50.4 10.86 3.310 Apr. 10 2015 1,160 32.9 9.11 2.777 Minimum discharge, 30 cu ft/s (0.85 cu m/s), Mar. 1-4. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 100 380 68 61 38 31 47 54 70 67 55 69 2 112 150 67 57 37 31 44 76 66 67 61 62 3 96 399 66 54 36 31 40 142 64 69 73 59 4 90 283 65 53 36 42 39 138 64 62 76 54 5 349 167 63 52 36 34 38 113 79 58 84 51 6 503 137 62 51 35 34 37 171 65 56 197 175 7 339 419 61 52 35 34 37 277 72 55 193 169 8 170 402 60 50 34 37 37 201 84 54 91 79 9 137 379 59 50 34 34 164 108 67 93 74 81 10 131 217 60 50 34 35 394 88 76 87 78 74 11 124 186 64 50 34 92 262 81 122 98 69 74 12 135 153 59 49 34 51 140 78 191 76 72 65 13 139 132 58 48 33 38 94 74 79 64 86 63 14 101 133 56 47 33 38 73 68 70 57 81 62 15 368 130 56 47 33 35 59 63 63 61 82 66 16 270 114 57 46 33 35 53 101 59 128 67 59 17 132 109 63 44 32 34 49 279 58 156 61 211 18 177 103 59 44 31 34 46 1780 132 383 57 487 19 275 96 55 44 32 33 50 1030 132 352 54 298 20 287 92 54 43 32 119 45 375 193 163 51 246 21 314 89 53 42 32 208 87 238 190 96 55 192 22 168 86 55 40 32 87 260 175 87 80 67 127 23 131 84 53 39 33 62 288 145 91 75 52 156 24 116 81 70 38 34 47 173 129 106 75 48 179 25 102 79 63 38 33 42 94 115 206 70 67 118 26 94 79 55 38 32 41 91 105 209 66 79 93 27 88 77 56 38 31 62 74 97 104 61 69 92 28 100 75 65 38 32 76 63 90 80 60 66 96 29 117 73 59 38 --- 68 58 84 72 62 56 81 30 102 71 56 37 69 56 77 70 75 136 75 31 293 --- 69 37 55 --- 73 --- 62 114 --- TOTAL 5660 4975 1866 1415 941 1669 2992 6625 3021 2988 2471 3713 MEAN 183 166 60.2 45.6 33.6 53.8 99.7 214 101 96.4 79.7 124 MAX 503 419 70 61 38 208 394 1780 209 383 197 487 MIN 88 71 53 37 31 31 37 54 58 54 48 51 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 11230 9870 3700 2810 1870 3310 5930 13140 5990 5930 4900 7360 WTR YR 1985 TOTAL 38336 MEAN 105 MAX 1780 MIN 31 CFSM .00 1N. .00 AC-FT 76040 RIO CAMUY BASIN 65 50014800 RIO CAMUY NEAR BAYANRY, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS JUNE 1984 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TUBE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) FEB, 19 1342 32 296 23.0 SEP, 11 1246 73 290 24.5 MAR, 05 1340 34 326 23.0 I I I I I I RIO CAMUY BASIN 66 50015700 RIO CAMUY NEAR HATILLO, PR LOCATION.--Lat 18027'44", long 66°49'56", Hydrologic Unit 21010002, 1.8 i (2.9 km) southwest of Hatillo plaza, and 1.8 ni (2.9 km) southeast of Camuy plaza, 1.2 i (1.9 km) south of Planta de Purificacion, and 3.3 i (5.5 km) upstream fro Atlantic Ocean. DRAINAGE AREA.--Indeterminate, WATER-DISCHARGE RECORDS PERIOD OF RECORD.--June 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 13 ft (4 a), from topographic map. REMARKS.--No estimated daily discharges during water year. Records fair. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 6,250 cu ft/s (177 cu m/s), May 18, 1985, gage height, 20.67 ft (6.300 ), from rating curve extended above 200 cu ft/a (5.66 cu m/s) on basis of step-backwater analysis; minimum discharge, 36 cu ft/a (1.02 cu m/s), Mar. 19, 1985. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,800 cu ft/a (51.0 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/a) (cu m/s) (ft) (a) Date Time (cu ft/s) (cu /a) (ft) (a) Oct. 5 1945 2,270 64.3 14.27 4.349 May 18 2045 *6,250 177 *20.67 6.300 Oct. 6 1915 4,050 115 17.67 5.386 July 19 0015 2,610 73.9 15.01 4.575 Oct. 15 2100 2,410 68.3 14.58 4.444 Sept. 18 2330 2,740 77.6 15.28 4.657 Nov. 1 0015 2,340 66.3 14.43 4.398 Minimum discharge, 36 cu ft/s (1.02 cu m/s), Mar. 19. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 161 669 83 96 46 40 84 73 77 67 65 83 2 200 202 81 78 46 40 76 74 75 68 70 76 3 128 624 80 73 45 41 69 174 72 78 79 72 4 116 498 78 69 44 50 66 162 71 67 104 65 5 615 236 76 66 44 42 63 152 82 59 108 61 6 1480 191 75 62 44 41 60 146 72 57 156 147 7 992 671 73 63 43 41 58 344 68 56 325 365 8 351 705 72 60 43 43 61 281 100 54 141 96 9 230 724 73 58 43 44 146 124 74 69 88 91 10 222 327 72 59 42 41 631 93 81 101 88 79 11 204 265 76 59 42 95 440 84 98 92 80 95 12 200 218 73 57 42 60 252 81 257 72 81 77 13 235 184 69 55 41 44 118 79 88 61 98 73 14 167 180 67 54 42 43 90 73 76 53 98 71 15 639 196 70 55 43 41 72 69 71 61 94 73 16 593 161 71 53 42 40 63 105 67 112 78 66 17 214 150 81 51 41 40 56 241 67 192 71 127 18 207 145 75 52 40 40 52 2650 106 353 66 665 19 386 132 69 53 41 39 55 2300 205 852 63 663 20 440 125 68 52 40 91 51 523 215 210 60 292 21 938 120 66 51 40 627 97 267 350 117 60 266 22 296 115 72 49 40 154 364 184 108 95 88 164 23 208 110 68 49 40 108 609 149 94 88 66 140 24 171 105 103 48 44 77 417 132 133 91 60 259 25 146 102 88 46 42 69 151 120 193 83 57 158 26 131 101 74 46 41 65 130 107 290 79 106 116 27 123 98 75 46 41 100 107 98 113 75 78 103 28 130 93 92 46 41 138 89 90 81 74 79 117 29 174 90 83 45 --- 120 81 85 73 69 67 96 30 150 86 75 45 130 77 81 70 88 180 91 31 348 --- 105 45 101 --- 80 --- 72 198 --- TOTAL 10595 7623 2383 1740 1183 2645 4684 9221 3527 3665 3052 4847 MEAN 342 254 76.9 56.1 42.3 85.3 156 297 118 118 98.5 162 MAX 1480 724 105 95 46 627 631 2650 350 852 325 665 MIN 116 86 66 45 40 39 51 69 67 53 57 61 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 21020 15120 4730 3450 2350 5250 9290 18290 7000 7270 6050 9610 WTR YR 1985 TOTAL 55165 MEAN 151 MAX 2650 MIN 39 CFSM .00 IN. .00 AC-FT 109400 RIO CAMUY BASIN 67 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 1984 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TUBE DATE TIME INSTANTANEOUS DUCTANCE TUBE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) FEB, 19 1115 39 308 23.5 SEP, 11 0925 100 334 24.0 MAR, 05 1038 39 343 23.0 I   69 A Tip ATLANTIC OCEA HAT PL Cone ARECIE3 0290 0135 BARCELONE TA • 161 0277 0 284 . Bayaney lorida 'F Drainage boundaries indeterminate in limestone terrane 027250 02709 Logo Dos Bocos 0251 0 -e. Limestone 72S 50 Igneous and edimentary rockst 0280 I on Rio Coreuy besot Logo Coonillos UTUAD a 0260512" Logo Jardo ( Logo Vi 123 YUYA ri oro poi Logo 4t- Poilejos ego Adjuntos RIO Grande de 0205 A5asco basin 86 ADJUNTAS • Drainage • ..r\---boundary Ries Inebo'e eucand CaUrs basin Drainage boundary 020050 'k EXPLANATION RtoZr,tugue's Island divide°. Eo 7;cs A 0284 SURFACE—WATER STATION AND NUMBER 5 KILOMETERS Ria GuayOniHC basin lit I/Rio Toltaboo • bosin 0205 QUALITY—OF—WATER STATION AND NUMBER 025110 QUALITY—OF—WATER PARTIAL RECORD STATION AND NUMBER \--Mop area • 161 WELL AND WELL NUMBER .ABLIAGI It"cciso fAaA0 CAGVA,,, 5 MILER Figure 15.--Rio Grande de Arecibo basin. I 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 i (15.6 sq km) above Lago Garzas. PERIOD OF RECORD.--Water years 1969-74, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANKOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 30... 17:00 150 158 7.9 20.5 55 8.5 100 19 K91000 57000 FEB 1985 07... 09:50 15 316 7.8 18.0 35 10.4 109 13 6000 5600 APR 02... 08:00 16 300 7.4 18.0 1.0 8.2 91 17 K1000 K1300 JUN 05... 09:25 33 280 8.2 21.5 1.0 8.3 99 17 3400 900 JUL 30... 16:45 10 564 8.0 29.5 5.2 7.4 102 11 5600 3200 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, UNITY SULFATE RIDE, NESS NONCAR- DIS- DIS- DIS- SORP- DIS- FIELD SULFIDE HIS- DIS- (MG/L DONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/L (MG/L RATIO (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 1984 30... 50 12 4.8 9.3 0.6 1.5 52 5.9 10 FEB 1985 07... 110 28 10 19 0.8 1.7 113 <0.5 8.5 27 APR 02... 114 JUN 05... 100 2 25 9.3 16 0.7 1.6 99 <0.5 9.3 21 JUL 30... 113 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 1984 30... <0.1 16 91 37 517 1.05 0.05 1.10 0.13 0.97 FEB 1985 07... <0.1 27 190 7.7 59 0.99 0.11 1.10 0.20 0.8 APR 02... 1 1.04 0.06 1.10 0.25 0.25 JUN 05... 0.1 26 170 15 8 1.18 0.02 1.20 0.18 0.42 JUL 30... 0.74 0.16 0.90 0.36 0.64 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 1984 30... 1.1 2.2 9.7 0.31 FEB 1985 07... 1.0 2.1 9.3 0.19 <1 <100 <20 <1 3 10 APR 02... 0.5 1.6 7.1 0.16 -- JUN 05... 0.6 1.8 8.0 0.08 <1 <100 40 1 5 <10 JUL 30... 1.0 1.9 8.4 0.26 K = non-ideal count RIO GRANDE DE ARECIBO BASIN 71 50020500 RIO GRANDE DE ARECIBO NR ADJUNTAS, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS 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) (UU/L) (MG/L) OCT 1984 30... FEB 1985 07... 2200 1 160 0.1 <1 <1 30 <0.01 3 0.03 APR 02... 0.1 JUN 05... 220 3 40 <0.1 <1 <1 <0.01 1 <0.01 JUL 30... 72 RIO GRANDE DE ARECIBO BASIN 50025000 RIO GRANDE DE ARECIBO NEAR UTUADO, PR WATER-QUALITY RECORDS LOCATION.--Lat 16°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 a1 (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 from 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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MO/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 23... 11:20 234 243 8.0 23.5 0.4 8.2 98 10 K160000 45000 FEB 1985 06... 13:00 34 276 8.0 26.0 1.0 9.3 114 10 3500 K1500 APR 01... 13:10 32 274 8.0 29.0 3.0 7.1 93 14 K790 960 JUN 03... 15:45 121 255 8.2 31.0 37 7.1 97 15 58000 9000 JUL 25... 16:25 40 271 8.4 32.0 13 7.5 103 25 79000 3000 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, NESS NONCAR- DIS- DIS- DIS- SORP- DIS- FIELD SULFIDE DIS- DIS- (MG/1. DONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/L (MG/L RATIO (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 1984 23... 88 10 23 7.6 13 0.6 2.0 78 20 15 FEB 1985 06... 100 9 27 8.2 15 0.7 2.0 92 (0.5 24 14 APR 01... 93 JUN 03... 100 11 26 8.4 14 0.6 2.1 89 <0.5 20 12 JUL 25... 92 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) SIO2) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1984 23... 0.1 27 150 98 58 1.26 0.04 1.30 0.06 0.54 FEB 1985 06... 0.1 20 170 15 6 1.09 0.11 1.20 0.16 0.64 APR 01... 5 1.22 0.08 1.30 <0.01 JUN 03... 0.1 25 160 53 52 0.77 0.03 0.80 0.11 0.49 JUL 25... 13 0.86 0.04 0.90 0.04 0.46 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 1984 23. 0.6 1.9 8.4 0.10 FEB 1985 06... 0.8 2.0 8.9 0.22 <1 <100 30 <1 <1 10 APR 01... 0.6 1.9 8.4 0.26 JUN 03... 0.6 1.4 6.2 0.10 <1 100 <20 <1 25 JUL 25... 0.5 1.4 6.2 0.20 K = non-ideal count 30 RIO GRANDE DE ARECIBO BASIN 73 50025000 RIO GRANDE DE ARECIBO NEAR UTUADO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 TOTAI, RHABLE 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 1984 i 23... FEB 1985 06... 220 1 20 <0.1 <1 <1 30 <0.01 <1 0.02 APR 01... <0.1 JUN 03... 6900 8 300 <0.1 <1 <1 50 <0.01 12 0.01 JUL 25... RIO GRANDE DE ARECIBO BASIN 74 50026050 RIO CAONILLAS ABOVE LAGO CAONILLAS NEAR JAYUYA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°13'26", long 66°38'22", 300 ft (91 a) off Highway 531, 700 ft (213 m) upstream from Lago Caonillas, 3.3 mi (5.3 km) northwest of Jayuya plaza. DRAINAGE AREA.--40.4 sq mi (104.6 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 30... 11:10 118 182 8.2 22.5 5.0 8.6 102 <10 K1400 1100 FEB 1985 05... 14:30 32 218 8.9 24.5 2.0 9.8 119 17 K60 K20 APR 01... 17:20 31 205 8.1 25.0 2.0 7.8 97 21 K140 420 JUN 04... 14:30 88 181 8.2 26.0 25 7.6 95 15 K8000 690 JUL 30... 12:35 62 183 8.2 26.5 34 8.1 103 <10 4700 2100 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, NESS NONCAR- DIS- DIS- DIS- SORP- DIS- FIELD SULFIDE DIS- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/L (MG/L RATIO (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 1984 30... 66 4 17 5.6 9.9 0.6 1.3 62 13 9.5 FEB 1985 05... 81 2 21 7.0 12 0.6 1.3 79 <0.5 16 13 APR 01... 71 JUN 04... 66 6 17 5.7 9.7 0.5 1.4 60 <0.5 15 10 JUL 30... 57 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 1984 30... <0.1 24 120 37 4 0.69 0.01 0.70 <0.01 FEB 1985 05... <0.1 9.8 130 11 8 0.18 0.02 0.20 0.05 0.25 APR 01... 5 <0.01 0.40 <0.01 JUN 4... <0.1 20 110 27 54 <0.01 0.60 0.02 0.68 JUL 30... 50 <0.01 0.60 0.04 0.36 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 ENABLE ERABLE ENABLE 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 1984 30... 0.3 1.0 4.4 0.06 FEB 1985 5... 0.3 0.5 2.2 0.06 <1 <100 <20 2 6 <10 APR 01... 0.4 0.8 3.5 0.08 JUN 04... 0.7 1.3 5.8 0.04 <1 <100 <20 1 6 JUL 30... 0.4 1.0 4.4 0.11 K = non-ideal count RIO GRANDE DE ARECIBO BASIN 75 50026050 RIO CAONILLAS ABOVE LAGO CAONILLAS NEAR JAYUYA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1984 30... FEB 1985 05... 220 1 20 <0.1 <1 <1 <10 <0.01 4 0.04 APR 01... <0.1 JUN 04... 2100 4 140 <0.1 <1 <1 20 <0.01 <1 0.01 JUL 30... RIO GRANDE DE ARECIBO BASIN 76 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 Betas 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. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIE- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIE- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MO/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 29... 15:55 167 194 7.7 24.5 10 5.8 70 19 94 K22 FEB 1985 06... 09:40 28 212 7.6 22.5 1.5 8.1 93 <10 K12 42 APR 02... 12:00 130 208 7.3 25.0 1.5 5.8 70 17 110 54 JUN 04... 09:50 17 120 7.5 23.0 230 6.0 70 17 K73 230 JUL 25... 12:25 18 185 7.7 27.5 15 7.5 95 24 79000 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SLUM, LINITY SULFATE RIDE, NESS NONCAR- DIS- DIS- DIS- SORP- DIE- FIELD SULFIDE DIS- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/L (MG/L RATIO (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 1984 29... 64 2 17 5.2 8.9 0.5 1.6 62 12 9.1 FEB 1985 06... 79 1 21 6.4 10 0.5 1.7 78 <0.5 12 11 APR 02... 75 JUN 04... 46 5 12 3.8 6.9 0.5 1.6 41 <0.5 7.8 7.4 JUL 25... 64 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIE- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIE- (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 1984 29... <0.1 19 110 50 <1 <0.01 0.70 0.07 0.53 FEB 1985 06... <0.1 22 130 9.9 4 <0.01 0.60 <0.01 APR 02... 1 <0.01 0.30 <0.01 JUN 04... 0.1 14 78 3.7 154 0.66 0.04 0.70 0.13 1.1 JUL 25... 3 <0.01 0.40 0.03 0.37 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/1. (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 1984 29... 0.6 1.3 5.8 0.05 FEB 1985 06... 0.3 0.9 4.0 0.04 <1 <100 20 <1 <1 10 APR 02... 0.6 0.9 4.0 <0.01 JUN 04... 1.2 1.9 8.4 0.14 <1 100 30 1 28 50 JUL 25... 0.4 0.8 3.5 0.02 K = non-ideal count RIO GRANDE DE ARECIBO BASIN 77 50027250 RIO GRANDE DE ARECIBO BELOW LAGO DOS BOCAS NEAR FLORIDA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELK- 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 1984 29. FEB 1986 08... 150 2 70 <0.1 <1 <1 10 <0.01 1 0.04 APR 02... <0.1 JUN 04... 12000 5 240 <0.1 <1 <1 60 <0.01 5 <0.01 JUL 26... 78 RIO GRANDE DE ARECIBO BASIN 50027750 RIO GRANDE DE ARECIBO ABOVE ARECIBO, PR LOCATION.--Lat 18°25'29", long 66°41'44", Hydrologio Unit 21010002, 0.8 mi (1.3 km) upstream from Rio Tanama, 4.0 mi (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 sq mi (520 sq km), 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), from topographic map. REMARKS.--Estimated daily discharges: May 18 to July 16. 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 cu ft/s (1,300 cu m/s), May 18, 1985, gage height, 18.22 ft (5.553 a), from floodmark, from rating curve extended above 2,400 cu ft/s (68.0 cu m/s) on basis of slope-area measurement of peak flow; minimum discharge, 37 cu ft/s (1.05 cu m/s), May 15, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,300 cu ft/s (122 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/a) (cu m/s) (ft) (m) May 17 1100 4,590 130 9.79 2.984 May 18 1700 *45,800 1,300 *18.22 5.553 Minimum discharge, 39 cu ft/a (1.10 cu m/s), Aug. 23, 24, 29, 30. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 630 631 780 757 938 994 1080 1290 2410 1650 83 79 844 781 786 657 284 67 568 162 60 56 67 189 114 342 429 201 317 124 394 473 450 244 322 928 293 247 793 227 4000 890 940 110 100 180 110 270 160 140 53 116 130 56 47 159 220 241 365 113 6 7 8 9 10 1190 1340 830 1340 1040 1680 1800 1820 1990 1820 610 109 272 90 499 322 244 699 636 293 129 152 162 471 206 206 160 340 161 194 368 130 563 686 741 343 129 140 86 108 260 760 720 660 700 140 120 110 169 431 400 85 219 290 150 49 273 377 480 216 11 12 13 14 15 935 1320 1260 199 393 1710 1680 1660 983 1050 200 178 641 500 490 66 72 65 628 290 213 409 677 676 235 277 390 650 355 479 681 513 94 204 663 104 173 720 694 503 450 400 100 120 160 498 311 89 79 430 65 351 395 471 418 323 342 519 201 287 16 17 18 19 20 436 798 323 371 1630 974 1490 1630 1620 346 237 362 718 174 122 205 174 83 105 57 69 52 50 50 242 87 79 357 511 560 256 657 685 743 669 967 2600 14800 7800 2300 110 230 180 190 780 453 131 98 172 742 434 94 51 300 75 541 113 664 693 631 21 22 23 24 25 1820 1140 1480 1560 987 109 98 93 88 83 123 69 373 282 190 69 167 615 537 86 377 76 237 99 283 653 438 66 284 647 178 751 719 1420 831 1400 1400 2800 2000 700 350 120 110 450 660 237 368 107 60 52 50 70 40 46 147 291 1460 115'17 110 26 27 28 29 30 31 782 212 158 647 753 1010 337 472 501 202 93 --- 76 700 700 690 400 138 54 57 71 50 48 179 73 178 413 --- 600 563 375 515 330 199 576 96 312 533 925 --- 1500 1200 1000 1700 1500 1600 330 350 320 110 170 --- 411 368 250 875 569 96 44 74 111 41 281 784 471 598 550 534 747 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 27690 893 1820 158 4.46 5.15 54920 31753 1058 2410 83 5.29 5.91 62980 11516 371 844 69 1.85 2.14 22840 7610 245 699 48 1.22 1.42 15090 6015 215 677 50 1.07 1.12 11930 10889 351 653 66 1.75 2.03 21600 15867 529 1420 94 2.64 2.95 31470 50755 1637 14800 86 8.18 9.44 100700 14830 494 4000 100 2.47 2.76 29420 8226 265 875 52 1.32 1.53 16320 5888 190 784 40 .95 1.10 11680 13235 441 1460 49 2.20 2.46 26250 CAL YR 1984 WTR YR 1985 TOTAL TOTAL 166235 204274 MEAN MEAN 454 560 MAX MAX 2810 14800 MIN MIN 37 40 CFSM CFSM 2.27 2.80 IN. IN. 30.92 37.99 AC-FT AC-FT 329700 405200 RIO GRANDE DE ARECIBO BASIN 79 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 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TUBE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) SEP, 17 1108 67 249 27.0 I I I I I I 80 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR LOCATION.--Lat 18°18'02", long 66°46'58", Hydrologio Unit 21010001, on downstream side of left abutment of bridge on Highway 111, 1.2 mi (1.9 km) upstream fro natural tunnel, 1.5 mi (2.4 km) northeast of Angeles, and 6.8 mi (9.3 km) northwest of Utuado. DRAINAGE AREA.--18.4 sq mi (47.7 sq 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. Elevation of gage is 938.32 ft (286 ) above mean sea level. Datum of gage was lowered 3.00 ft (0.914 ) on Oct. 1978. Prior to Nov. 17, 1966, non-recording gage and Nov. 17, 1966 to Sept. 30, 1978 recording gage, both at present site. REMARKS.--No estimated daily discharges during water year. Records fair. AVERAGE DISCHARGE.--25 years (1961-85), 48.3 cu ft/s (1.368 cu /s), 35.65 in/yr (906 mm/yr), 34,990 acre-ft/yr (43.1 cu hm/yr); median of yearly mean discharges, 48 cu ft/s (1.36 cu m/s), 34,800 acre-ft/yr (43 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximus discharge, 12,190 Cu ft/s (345 cu a/s), May 18, 1985, gage height, 17.45 ft (5.319 ) new datum in use, from floodmark and recorder, from rating curve extended above 500 cu ft/a (14.2 cu m/s) on basis of slope-area measurement of peak flow; minimum, 6.6 cu ft/s (0.187 cu m/s), June 12, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 cu ft/s (85.0 cu /s) and maximum (*); Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) May 18 1030 *12,200 346 *17.45 5.319 Minimum discharge, 16 cu ft/a (0.453 cu m/s), Apr. 20, 21. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 103 71 64 60 155 63 64 216 109 91 46 49 47 44 43 34 34 33 32 32 27 25 25 25 25 23 22 29 31 22 24 22 21 21 20 23 48 76 40 32 51 50 53 62 49 39 36 27 25 25 40 27 23 55 26 30 30 26 25 25 6 7 8 9 10 72 58 51 51 48 74 194 157 149 109 43 42 42 42 55 35 32 30 30 30 24 23 24 23 23 23 23 25 24 51 20 20 19 34 71 37 35 29 27 27 48 61 41 41 41 25 25 30 27 29 78 43 32 27 31 62 94 59 35 29 11 12 13 14 15 45 44 43 41 48 101 87 78 97 86 45 42 39 38 39 30 29 28 27 28 25 23 23 24 24 33 29 21 21 19 29 24 21 20 19 45 35 28 26 71 69 43 36 34 33 40 30 25 23 35 34 26 31 100 46 27 30 34 40 32 16 17 18 19 20 47 47 116 73 57 74 71 66 63 61 49 57 43 41 39 27 27 26 26 25 23 21 21 21 21 19 18 19 18 40 18 17 18 18 17 98 223 1890 254 167 39 64 116 58 62 33 42 89 39 28 41 31 25 23 25 28 174 144 77 62 21 22 23 24 25 52 46 44 42 40 59 57 55 54 58 36 37 35 60 36 25 25 25 24 24 21 21 22 26 22 50 38 26 29 21 51 132 71 41 57 126 105 92 85 74 48 46 61 39 41 26 24 31 24 23 27 27 27 27 84 62 56 84 105 67 26 27 28 29 30 31 39 38 44 42 84 107 62 53 51 49 47 --- 36 43 38 35 36 37 24 24 24 24 25 25 23 23 22 --- 20 40 40 56 41 28 41 30 27 25 24 --- 66 61 58 57 54 53 32 29 27 27 27 --- 23 33 28 41 26 24 40 45 30 27 79 46 49 43 40 37 36 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 1872 60.4 155 38 3.28 3.78 3710 2555 85.2 216 47 4.63 5.17 5070 1314 42.4 60 35 2.30 2.66 2610 864 27.9 36 24 1.52 1.75 1710 650 23.2 27 21 1.26 1.31 1290 899 29.0 56 18 1.58 1.82 1780 972 32.4 132 17 1.76 1.97 1930 4042 130 1890 23 7.07 8.17 8020 1417 47.2 116 27 2.57 2.86 2810 975 31.5 89 23 1.71 1.97 1930 1223 39.5 100 23 2.15 2.47 2430 1642 54.7 174 25 2.97 3.32 3260 CAL YR 1984 WTR YR 1985 TOTAL TOTAL 16825.3 18425 MEAN MEAN 46.0 50.5 MAX MAX 260 1890 MIN MIN 6.5 17 CFSM CFSM 2.50 2.74 IN. IN. 34.02 37.25 AC-FT AC-FT 33370 36550 I 81 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 ourrent 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 fro a sediment transport curve developed from a period of record over 5 years. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATIONS: Maximum daily mean, 20,400 mg/L November 27, 1968; minimum daily mean, 0 mg/L during water year 1985. SEDIMENT LOADS: Maximus 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, 11,200 mg/L May 18, 1986; minimum daily mean, 1.0 mg/L several days during water year 1985. SEDIMENT LOADS: Maximum daily, 167,000 tons (152,000 tonnes) May 18, 1985; minimum daily, 0.05 ton (0.04 tonne) several days during water year 1985. WATER-QUALITY DATA, WATER YEARS OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI­ STREP­ SPE­ DIS- DEMAND, FORM, TOCOCCI STREAM­ CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON­ PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DATE TIME TANEOUS DUCT­ ANCE (STAND- ARD TEMPER- ATURE BID- ITY DIS- CENT (HIGH UM-MF SOLVED SATUR- LEVEL) (COLS./ (COLS. PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 01... 10:00 61 163 8.0 20.5 34 8.6 99 17 4200 K100000 FEB 1985 05... 16:30 25 165 8.6 22.0 2.5 8.9 105 <10 K180 220 MAR 13... 16:15 21 163 7.6 22.0 9.6 8.2 97 59 380 470 MAY 15... 15:25 27 173 7.9 25.0 0.9 8.2 103 20 K140 220 AUG 02... 09:40 27 177 7.0 23.5 51 7.9 95 <10 4900 2700 HARD­ MAGNE­ SODIUM POTAS- ALKA­ CHLO- HARD­ NESS, CALCIUM SIUM, SODIUM, AD­ MUM, LINITY SULFATE RIDE, NESS NONCAR­ DIS­ DIS­ DIS­ SORP­ DIS- FIELD SULFIDE DIE- DIS­ DATE (MG/L AS CAC03) BONATE (Win CAC03) SOLVED (MG/L AS CA) SOLVED (MG/L AS MG) SOLVED (MO/L AS NA) TION RATIO SOLVED (MG/L (MG/L AS AS K) CAC03) TOTAL (MG/L AS S) SOLVED SOLVED (MG/L (MG/L AS SO4) AS CL) NOV 1984 01... 58 3 15 5.1 7.6 0.4 1.7 55 11 7.6 FEB 1985 05... 62 15 5.9 8.4 0.5 1.6 62 <0.5 12 7.9 MAR 13... 57 MAY 15... 66 4 17 5.6 8.0 0.4 1.5 62 <0.5 14 7.8 AUG 02... 100 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO­ RIDE, DIE- CONSTI- DIE- 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 1984 01... <0.1 22 100 17 35 <0.01 0.80 <0.01 FEB 1985 05... <0.1 25 110 7.6 5 <0.01 0.50 <0.01 MAR 13... 15 0.67 0.03 0.70 0.06 0.54 MAY 15... <0.1 24 120 8.3 6 <0.01 0.50 0.03 0.07 AUG 02... 38 <0.01 0.70 0.09 0.21 K = non-ideal count 82 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued WATER-QUALITY DATA, WATER YEARS OCTOBER 1984 TO SEPTEMBER 1985 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) NOV 1984 1... 0.3 1.1 4.9 0.05 FEB 1985 05... 0.6 1.1 4.9 0.03 <1 <100 <20 <1 <1 <10 MAR 13... 0.6 1.3 5.8 0.01 MAY 15... 0.1 0.6 2.7 0.02 <1 <100 <20 2 2 10 AUG 2... 0.3 1.0 4.4 0.05 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 1984 01... -- FEB 1985 05... 330 1 30 <0.1 <1 <1 30 <0.01 1 0.04 MAR 13... 0.2 MAY 15... 430 3 40 <0.1 <1 <1 30 <0.01 8 0.02 AUG 02... SED. SED. SED. SED. SED. SED. SED. SED. SED. SED. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SEDI- FALL FALL FALL FALL FALL SIEVE SIEVE SIEVE SIEVE SIEVE MENT, DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. SUS- % FINER % FINER % FINER % FINER % FINER % FINER % FINER % FINER S FINER % FINER DATE TIME PENDED THAN THAN THAN THAN THAN THAN THAN THAN THAN THAN (MG/L) .002 MM .004 MM .008 MM .016 MM .031 MM .062 MM .125 MM .250 MM .500 MM 1.00 MM OCT 1984 05... 14:55 4100 12 21 32 49 70 85 92 98 99 100 05... 15:10 3960 11 21 32 46 64 73 87 96 99 99 05... 15:25 3660 10 18 28 46 67 78 91 97 99 99 05... 16:56 4280 10 20 31 48 67 77 86 90 94 97 31... 17:30 5120 12 21 30 42 67 69 76 83 91 98 31... 17:46 3270 16 26 39 68 73 82 89 94 97 98 MAY 1985 18... 08:50 14800 4 9 13 20 27 38 53 79 93 99 18... 10:00 18300 4 7 13 18 24 42 59 83 95 99 18... 10:15 25600 7 13 18 24 30 51 67 86 95 98 83 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued WATER-QUALITY DATA, WATER YEARS OCTOBER 1984 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 1 103 342 210 63 113 20 46 3 .37 2 71 133 25 64 100 19 49 39 6.5 3 64 109 19 216 832 842 47 55 7.2 4 60 95 15 109 297 97 44 42 5.0 5 155 605 1080 91 213 73 43 39 4.5 6 72 137 27 74 144 29 43 99 4.5 7 58 89 14 194 717 509 42 36 4.1 8 51 64 8.8 157 553 302 42 36 4.1 9 51 38 5.2 149 483 222 42 36 4.1 10 48 38 4.9 109 158 50 55 89 22 11 45 38 4.6 101 74 22 45 45 5.5 12 44 38 4.5 87 5 1.2 42 36 4.1 13 43 34 3.9 78 5 1.1 39 29 3.1 14 41 34 3.8 97 147 48 38 27 2.8 15 48 58 8.6 86 50 12 39 29 3.1 16 47 52 6.6 74 17 3.4 49 64 11 17 47 60 11 71 16 3.1 57 82 13 18 116 456 496 66 16 2.9 43 39 4.5 19 73 204 90 63 16 2.7 41 33 3.7 20 57 119 22 61 16 2.6 39 29 3.1 21 52 67 9.4 59 10 1.6 36 23 2.2 22 46 48 6.0 57 9 1.4 37 25 2.5 23 44 42 5.0 55 8 1.2 35 21 2.0 24 42 36 4.1 54 8 1.2 60 101 27 25 40 30 3.2 58 32 7.4 36 23 2.2 26 39 28 2.9 62 112 26 36 23 2.2 27 38 27 2.8 59 25 3.6 43 55 7.7 28 44 44 5.7 51 5 .69 38 27 2.8 29 42 36 4.1 49 3 .40 35 22 2.1 30 84 240 175 47 3 .38 36 18 1.6 31 107 403 679 --- --- --- 37 25 2.5 TOTAL 1872 2957.1 2555 2305.87 1314 171.07 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 34 20 1.8 27 11 .80 23 18 1.8 2 34 20 1.8 26 9 .61 22 4 .24 3 33 19 1.7 25 9 .61 29 38 5.2 4 32 17 1.5 25 9 .61 31 15 1.3 5 32 17 1.5 25 9 .61 22 4 .24 6 35 33 4.0 24 9 .58 23 5 .31 7 32 17 1.5 23 8 .50 23 5 .31 8 30 14 1.1 24 9 .58 25 8 .54 9 30 14 1.1 23 8 .50 24 6 .39 10 30 14 1.1 23 8 .50 51 121 58 11 30 14 1.1 26 10 .68 33 75 11 12 29 13 1.0 23 8 .50 29 27 3.2 13 28 12 .91 23 8 .50 21 3 .17 14 27 11 .80 24 9 .58 21 3 .17 15 28 12 .91 24 9 .58 19 1 .05 16 27 11 .80 23 8 .50 19 1 .05 17 27 11 .80 21 5 .28 18 1 .05 18 26 10 .70 21 5 .28 19 20 1.0 19 26 10 .70 21 5 .28 18 1 .05 20 25 9 .61 21 5 .28 40 67 18 21 25 18 1.2 21 5 .28 50 111 35 22 25 9 .61 21 5 .28 38 45 8.1 23 25 9 .61 22 7 .42 26 16 2.0 24 24 8 .52 26 10 .70 29 13 1.0 25 24 8 .52 22 12 .71 21 2 .11 26 24 8 .52 23 7 .43 20 1 .05 27 24 8 .52 23 7 .43 40 65 8.6 28 24 8 .52 22 4 .24 40 72 13 29 24 8 .52 --- --- --- 56 98 33 30 25 9 .61 41 33 3.7 31 25 9 .61 28 25 1.9 TOTAL 864 32.19 650 13.85 899 208.53 84 RIO GRANDE DE ARECIBO BASIN 60028000 RIO TANAMA NEAR UTUADO, PR--Continued WATER-QUALITY DATA, WATER YEARS OCTOBER 1984 TO SEPTEMBER 1985 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 24 20 1.3 23 5 .3 51 6 .83 2 22 2 .12 48 124 50 50 6 .81 3 21 1 .06 76 229 213 53 6 .86 4 21 1 .06 40 56 9.4 62 111 22 5 20 1 .05 32 33 2.9 49 35 4.6 6 20 1 .05 37 47 6.9 48 13 1.7 7 20 1 .05 35 34 4.6 61 106 26 8 19 12 .62 29 14 1.1 41 93 3.7 9 34 54 11 27 12 .9 41 29 3.2 10 71 292 321 27 12 .9 41 18 2.0 11 29 15 1.2 45 96 38 69 158 90 12 24 6 .39 35 22 2.1 43 39 4.5 13 21 2 .11 28 12 .9 35 22 2.1 14 20 1 .06 26 10 .7 34 20 1.8 15 19 20 1.0 71 281 376 33 19 1.7 16 18 19 .92 98 343 246 39 20 2.1 17 17 1 .05 223 1120 1620 54 21 3.1 18 18 1 .05 1890 11200 167000 116 366 308 19 18 1 .05 254 941 716 58 98 18 20 17 1 .05 167 210 95 62 172 74 21 51 142 74 126 120 41 48 54 7.0 22 132 490 474 105 75 21 46 48 6.0 23 71 227 75 92 38 9.4 61 179 85 24 41 41 4.2 85 25 5.7 39 44 4.7 25 57 168 77 74 35 7.0 41 104 34 26 41 33 3.7 66 23 4.1 32 17 1.5 27 30 14 1.1 61 20 3.3 29 10 .73 28 27 10 .73 58 15 2.3 27 10 .73 29 25 20 1.4 57 11 1.7 27 10 .73 30 24 19 1.2 54 8 1.2 27 10 .73 31 --- --- --- 53 6 .9 --- --- --- TOTAL 972 1050.51 4042 170482.2 1417 712.12 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 39 53 11 40 107 46 30 14 1.1 2 36 46 6.4 27 10 .73 30 14 1.1 3 27 10 .73 23 5 .31 26 8 .56 4 25 8 .54 55 131 83 25 7 .47 5 25 8 .54 26 9 .69 25 7 .47 6 25 8 .54 78 317 259 62 186 94 7 25 8 .54 49 129 24 94 383 437 8 30 27 2.6 92 20 1.8 69 153 43 9 27 12 .98 27 30 2.2 35 22 2.1 10 29 18 2.2 31 42 4.6 29 13 1.0 11 40 71 14 34 55 10 27 11 .80 12 30 14 1.1 26 8 .56 30 14 1.1 13 25 8 .54 31 20 2.3 34 17 1.6 14 23 5 .31 100 471 821 40 74 18 15 35 81 15 46 48 6.0 32 17 1.5 16 33 27 3.1 41 33 3.7 28 12 .91 17 42 103 30 31 16 1.3 174 980 4520 18 89 443 602 25 8 .54 144 444 382 19 39 30 3.2 23 6 .37 77 156 39 20 28 10 .76 25 8 .54 62 222 125 21 26 8 .56 27 10 .73 62 133 40 22 24 6 .39 27 10 .73 56 103 24 23 31 44 9.8 27 10 .73 84 211 67 24 24 6 .39 27 10 .73 105 421 305 25 23 10 .62 84 269 256 67 80 14 26 23 10 .62 40 42 6.5 49 30 4.0 27 33 43 10 45 45 5.5 43 11 1.3 28 28 17 1.9 30 14 1.1 40 3 .32 29 41 99 40 27 10 .73 37 1 .10 30 26 9 .63 79 357 357 36 1 .10 31 24 6 .39 46 48 6.0 --- --- --- TOTAL 975 761.38 1223 1904.33 1642 6126.53 YEAR 18425 186725.68 I I I I 85 RIO GRANDE DE ARECIBO BASIN 50028400 RIO TANAMA AT CHARCO HONDO, PR LOCATION.--Lat 18°24'52", long 66042'52", on right bank at abandoned power house at Charco Hondo, 1.5 i (2.4 km) upstream from mouth, and 4 mi (6 km) south of Areoibo. DRAINAGE AREA.--57.6 sq mi (149.2 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--April 1969 to June 1971, Ootober 1981 to current year. GAGE.--Water-stage recorder. Elevation of gage is 60 ft (18 m), fro topographic map. REMARKS.--Estimated daily discharges: May 18-20. 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.--5 years (1970,1982-85), 97.2 cu ft/s (2.753 cu m/s), 22.92 in/yr (582 ma/yr), 70,420 acre-ft/yr (86.8 cu ha/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 15,000 cu ft/s (425 cu m/s), May 18, 1985, gage height, 17.95 ft (5.471 m), fro floodmark, from rating curve extended above 1,000 cu ft/s (28.3 cu m/s)on basis of step-backwater analysis; minimum discharge, 21 cu ft/s (0.595 cu m/s), Apr. 27, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 cu ft/s (56.6 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) May 18 1200 *15,000 425 *17.95 5.471 Minimum discharge, 30 cu ft/s (0.850 cu m/s), Mar. 18, Apr. 7. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 108 188 81 67 44 35 43 58 64 55 60 62 2 116 132 80 65 43 39 40 86 63 79 72 56 3 81 404 85 62 42 36 37 224 61 66 48 54 4 78 303 79 61 41 62 36 186 71 55 130 50 5 310 180 75 59 42 40 35 100 82 52 114 48 6 436 152 75 59 42 41 34 83 64 51 95 63 7 206 399 73 66 40 42 34 103 74 50 105 107 8 127 399 72 59 41 44 37 96 99 50 85 121 9 109 403 71 57 41 42 60 69 72 60 61 75 10 106 256 77 59 41 44 224 64 72 63 52 58 11 94 219 91 58 42 70 219 60 86 86 67 53 12 102 184 75 56 41 48 100 86 118 104 71 51 13 138 161 69 53 41 37 56 68 67 64 73 63 14 92 174 67 53 41 38 46 60 57 50 120 59 15 130 183 67 54 43 35 44 60 54 58 94 67 16 169 150 75 52 41 34 40 240 52 89 61 52 17 132 141 104 51 39 34 39 291 52 153 54 150 18 213 130 82 50 38 34 38 2460 141 192 51 187 19 198 121 72 49 38 35 42 720 220 182 47 122 20 224 115 72 47 38 45 37 380 123 88 45 91 21 273 111 67 47 38 94 81 205 127 67 46 81 22 156 105 69 46 38 73 313 151 90 58 50 118 23 117 101 67 46 38 44 384 123 85 62 46 119 24 102 97 105 46 44 48 224 111 103 69 43 146 25 91 96 74 45 39 38 132 100 101 52 75 124 26 86 109 68 44 40 36 114 91 81 49 98 83 27 81 92 72 44 38 50 80 84 65 49 97 70 28 90 91 79 44 38 71 69 79 59 65 72 66 29 113 86 70 45 --- 66 63 73 57 60 55 63 30 154 84 68 43 84 60 69 55 68 93 76 31 212 --- 79 42 53 --- 66 --- 47 113 --- TOTAL 4643 5366 2360 1628 1132 1482 2761 6645 2515 2293 2293 2535 MEAN 150 179 76.1 52.5 40.4 47.8 92.0 214 83.8 74.0 74.0 84.5 MAX 436 404 105 67 44 94 384 2460 220 192 130 187 MIN 78 84 67 42 38 34 34 58 52 47 43 48 CFSM 2.60 3.11 1.32 .91 .70 .83 1.60 3.72 1.45 1.28 1.28 1.47 IN. 3.00 3.47 1.52 1.05 .73 .96 1.78 4.29 1.62 1.48 1.48 1.64 AC-FT 9210 10640 4680 3230 2250 2940 5480 13180 4990 4550 4550 5030 CAL YR 1984 TOTAL 33522 MEAN 91.6 MAX 621 MIN 22 CFSM 1.59 IN. 21.65 AC-FT 66490 WTR YR 1985 TOTAL 35653 MEAN 97.7 MAX 2460 MIN 34 CFSM 1.70 IN. 23.03 AC-FT 70720 86 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 1984 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) SEP, 16 1154 66 259 25.0 RIO GRANDE DE ARECIBO BASIN 50029000 RIO GRANDE DE ARECIBO AT CENTRAL CAMBALACHE, PR 87 WATER-QUALITY RECORDS LOCATION.--Lat 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 of Arecibo. DRAINAGE AREA.--200 sq mi (520 sq km), approximately. PERIOD OF RECORD.--Water years 1963-66, 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 13... 16:55 2040 200 7.8 25.0 29 7.7 93 15 K710 K150 JAN 1985 24... 15:20 182 252 8.2 25.0 8.6 104 13 K300 K460 APR 03... 11:10 145 252 8.1 25.0 2.5 8.7 105 14 220 K30 MAY 14... 12:30 179 253 7.6 26.0 7.6 8.0 98 22 470 K90 AUG 05... 15:15 175 285 8.2 29.0 27 7.3 94 <10 5000 770 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, NESS NONCAR- DIS- DIS- DIS- SORP- DIS- FIELD SULFIDE DIS- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 3) AS SO4) AS CL) NOV 1984 13... 75 5 22 4.9 8.6 0.4 1.7 70 11 11 JAN 1985 24... 98 29 6.3 10 0.5 1.7 100 <0.5 13 12 APR 03... 106 MAY 14... 110 1 35 5.6 9.1 0.4 1.7 109 <0.5 11 9.9 AUG 05... 143 8.7 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 1984 13... <0.1 18 120 657 34 <0.01 0.70 0.04 1.4 JAN 1985 24... 0.1 20 150 75 141 <0.01 0.60 0.07 0.03 APR 03... 3 <0.01 0.30 <0.01 MAY 14... 0.2 16 150 74 6 0.37 0.03 0.40 0.06 AUG 05... 46 0.59 0.01 0.60 0.04 0.36 NITRO- CIIRO- 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 1984 13... JAN 1985 24... APR 03... MAY 14... AUG 05... 1.4 0.1 0.3 <0.1 0.4 2.1 9.3 0.7 3.1 0.6 2.7 1.0 4.4 0.08 -- 0.08 100 <20 <1 14 20 <0.01 0.04 <1 <100 <20 1 4 10 0.11 K = non-ideal count 88 RIO GRANDE DE ARECIBO BASIN 50029000 RIO GRANDE DE ARECIBO AT CENTRAL CAMBALACHE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1984 13... JAN 1985 24... 7000 4 260 <0.1 1 30 <0.01 7 0.02 APR 03... MAY 14... 320 5 20 <0.1 <1 <1 20 <0.01 2 0.03 AUG 05...  ---- 89 A TL ANTIC OCEAN 0382 ono Tortuguero BARCELONE TA VEGA BAJA • 71 68 0381 MANATI N VEGA ALTA a • 142 Drainage boundaries indeterminate in limestone terrone Florida (\s\ 05 035950, Ay ,„\\ ---, Cl ' 1 ---.--- L-N m -----, / V'\-,7--.. ....____.- Limestone $ Igneous and 0350 MOROVIS sedimentary rocks L.-^ 0312 N Drainage Rio CONJ.) basin boundary de M'ana47-'` c•- (.,-Drainage boundary Rio Grande de Arecibo basin Rib de la Plato basin Island -f;filat Canal de Aceitunos and tunnel to Rio Jacagoos RH O J basin ' Rib Coomo ) basin EXPLANATION Rio Inabori basin A 0350 SURFACE-WATER STATION AND NUMBER 0307 QUALITY-OF-WATER STATION AND NUMBER Mop area • 142 WELL AND WELL NUMBER A .AG AD F.:7'Irr."..°"^",, PA • soot' 4410 .CA114411 0 4 5 KILOMETERS PONCE. r. 0 4 5 MILES Figure 16.--Rio Grande de Manati basin. 90 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 n) 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. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLT- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 EF AGAR DATE TIME INSTAN- DUCT- (STAND- TEMPER­ TANEOUS ANCE ARD ATURE (CFS) (US/CM) UNITS) (DEG C) BID- ITY (NTU) DIS- SOLVED (MG/L) CENT (HIGH UM-MF (COLS. SATUR- LEVEL) (COLS./ PER ATION) (MG/L) 100 ML) 100 ML) NOV 1984 19... 18:35 25 223 8.2 24.0 3.3 7.8 97 16 K7300 990 JAN 1985 23... 18:05 12 281 8.7 23.0 7.8 96 22 K6300 720 MAR 14... 16:15 7.7 294 8.6 24.0 2.0 9.0 113 11 K970 610 MAY 24... 15:15 30 206 7.9 25.5 15 7.9 101 13 5900 680 AUG 19... 13:45 6.5 317 8.7 27.0 3.6 7.6 99 <10 K1100 K60 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, NESS NONCAR- D1S- DIS- DIS- SORP- DIS- FIELD SULFIDE DIS- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/I, (MG/L RATIO (MG/L AS (MG/L (MG/1. (MG/L CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 8) AS SO4) AS CL) NOV 1984 19... 92 0 22 9.1 9.9 0.5 1.5 92 7.7 13 JAN 1985 23... 120 29 11 13 0.5 3.0 121 <0.5 8.1 16 MAR 14... 127 MAY 24... 77 2 18 7.8 9.9 0.5 1.9 75 <0.5 7.8 12 AUG 19... 125 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 ci, N, clN, 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) SIO2) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) NOV 1984 19... 0.1 31 150 10 6 0.89 0.01 0.90 0.16 0.24 JAN 1985 23... 0.2 31 180 6.0 4 0.77 0.03 0.80 0.23 0.57 MAR 14... 6 0.58 0.02 0.60 0.04 0.66 MAY 24... 0.1 27 130 10 14 <0.01 1.00 0.07 0.43 AUG 19... 1 <0.01 1.00 0.02 0.48 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 (UO/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) NOV 1984 19... 0.4 1.3 6.8 0.02 JAN 1985 23... 0.8 1.6 7.1 0.31 <1 <100 <20 1 7 <10 MAR 14... 0.7 1.3 5.8 0.35 MAY 24... 0.5 1.5 6.6 0.03 <1 <100 20 <1 4 <10 AUG 19... 0.5 1.5 6.6 0.32 K = non-ideal count RIO GRANDE DE MANATI BASIN 91 50030700 RIO OROCOVIS NEAR OROCOVIS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL RRABLE 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 1984 19... JAN 1985 23... 280 1 50 <0.1 <1 <1 30 <0.01 5 0.06 MAR 14... 0.1 MAY 24... 1000 4 40 0.1 <1 <1 10 <0.01 1 0.01 AUG 19... I I I I I I 92 RIO GRANDE DE MANATI BASIN 50031200 RIO GRANDE DE MANATI NEAR MOROVIS, PR LOCATION.--Lat 18°17'45", long 66°24'47", Hydrologic Unit 21010001, on right bank (relocated), 0.1 mi (0.2 km) downstream from Quebrada Perches, 0.8 i (1.3 km) upstream fro Rio Sana Muerto, and 2.2 i (3.5 km) south of Morovis. DRAINAGE AREA.--55.2 sq mi (143.0 sq 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 a), from topographic map. Feb. 2, 1966 to Apr. 27, 1967, staff gage read twice daily. REMARKS.--Estimated daily discharge: Mar. 14 to July 15. Records fair except those for estimated daily discharges, which are poor. Public water-supply pumpage, about 300 ft (91 a) above the station, influences low-flow discharges. AVERAGE DISCHARGE.--20 years (1966-85), 106 cu ft/s (3.002 cu a/s), 26.08 in/yr (662 am/yr), 76,800 acre-ft/yr (94.7 cu ha/yr); median of yearly mean discharges, 98 cu ft/s (2.78 cu /s), 71,000 acre-ft/yr (88 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 48,000 cu ft/a (1,359 cu m/s), May 18, 1985, gage height, 17.89 ft (5.453 a), from floodmarks, from rating curve extended above 200 cu ft/a (5.66 cu m/s) on basis of coaputationa of flow over broad-crested weir and step-backwater analysis; minimum discharges, 4.4 cu ft/s (0.125 cu a/s), Apr. 15, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,500 cu ft/a (99.1 cu /a) and maximum (s): Discharge Gage height Discharge Gage height Date Time (Cu ft/a) (cu a/a) (ft) (a) Date Time (cu ft/a) (ou /s) (ft) (a) Nov. 3 1030 8,920 253 7.8 2.405 May 18 Unknown *48,000 1,359 *17.89 5.453 Minimum daily discharge, 19 cu ft/s (0.538 cu m/s), Aug. 18, 23. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 28 22 20 20 57 103 115 1880 490 431 91 98 148 104 91 145 155 133 119 103 60 53 52 49 48 60 48 43 41 44 73 51 42 45 37 32 49 100 47 37 74 70 106 154 96 37 36 35 34 32 27 29 33 25 26 25 24 24 27 23 6 7 8 9 10 156 95 59 49 69 394 1120 780 762 328 86 82 79 86 149 98 96 86 82 90 47 47 46 46 45 48 53 60 51 51 32 30 29 28 29 44 61 36 29 27 73 68 64 61 58 32 31 80 78 41 39 24 26 23 24 27 23 30 21 24 11 12 13 14 15 46 35 27 25 70 246 195 165 171 211 180 150 98 87 86 87 78 75 83 94 48 47 45 45 47 42 42 49 36 33 46 27 26 24 23 26 28 32 25 449 56 54 52 50 47 34 32 31 28 43 21 24 23 24 40 57 30 57 24 33 16 17 18 19 20 80 469 258 137 110 173 174 144 131 121 93 343 171 135 131 75 70 68 66 61 44 41 42 42 45 31 31 31 39 40 24 24 24 24 22 1040 5360 17100 1820 485 44 43 51 55 44 57 45 40 37 40 22 27 20 64 19 125 20 96 20 84 21 22 23 24 25 81 77 63 55 43 111 104 101 95 97 110 105 93 120 98 61 59 57 55 54 42 41 46 61 65 35 32 30 29 28 22 40 233 196 188 309 213 169 144 129 42 40 71 70 73 40 35 41 43 34 22 195 21 105 19 188 20 131 24 321 26 27 28 29 30 31 38 39 98 182 343 196 129 153 177 110 98 --- 99 160 210 166 157 169 65 55 55 52 51 50 86 64 82 --- 28 131 112 233 134 146 152 63 47 39 38 --- 117 106 96 90 84 81 70 44 39 37 36 --- 34 35 40 34 30 28 21 123 103 69 47 58 28 46 26 43 61 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 3047 98.3 469 20 1.78 2.06 6040 9309 310 1880 96 5.62 6.27 18460 3975 128 343 79 2.32 2.68 7880 2467 79.6 156 50 1.44 1.66 4890 1426 50.9 86 41 .92 .96 2830 1810 58.4 233 28 1.06 1.22 3590 1678 56.9 233 22 1.01 1.13 3330 28364 915 17100 25 16.6 19.11 56280 1842 61.4 154 36 1.11 1.24 3650 1217 39.3 80 28 .71 .82 2410 901 2124 29.1 70.8 103 321 19 23 .53 1.28 .61 1.43 1790 4210 CAL YR 1984 WTR YR 1985 TOTAL TOTAL 26847.7 58160 MEAN MEAN 73.4 159 MAX MAX 1880 17100 MIN MIN 5.7 19 CFSM CFSM 1.33 2.88 IN. IN. 18.09 39.19 AC-FT 53260 AC-FT 116400 RIO GRANDE DE MANATI BASIN 93 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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 19... 1330 133 240 8.30 25.0 6.4 8.3 102 15 K800 K35 JAN 1985 23... 1325 57 263 9.10 23.5 10.2 122 20 78 K37 MAR 14... 1215 39 260 8.40 24.0 9.0 9.2 111 10 K920 570 MAY 24... 1515 139 219 8.40 26.0 7.1 7.9 99 17 K560 96 AUG 13... 1440 44 215 8.50 32.0 10 6.3 86 12 510 110 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) CACO3 AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS SO4) AS CL) NOV 1984 19... 95 2 22 9.8 11 0.5 2.0 93 9.9 15 JAN 1985 23... 110 1 27 11 12 0.5 1.8 112 <0.5 8.2 16 MAR 14... 110 MAY 24... 81 19 8.2 10 0.5 2.5 82 <0.5 9.6 16 AUG 13... 98 SOLIDS, SOLIDS, FLIJO- 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 1984 19... 0.1 26 150 54 6 <0.01 1.00 0.10 0.2 JAN 1985 23... 0.2 17 160 25 3 <0.01 0.30 <0.01 MAR 14... 18 0.39 0.01 0.40 0.08 0.42 MAY 24... 0.2 23 140 52 10 <0.01 1.10 0.04 0.26 AUG 13... 10 0.89 0.26 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 1984 19... 0.3 1.3 5.8 <0.01 JAN 1985 23... 0.3 0.6 2.7 0.05 <1 <100 <20 1 13 <10 MAR 14... 0.5 0.9 4.0 0.05 MAY 24... 0.3 1.4 6.2 <0.01 <1 <100 20 1 4 <10 AUG 13... 1.2 5.3 K = non-ideal count RIO GRANDE DE MANATI BASIN 94 50031200 RIO GRANDE DE MANATI NEAR MOROVIS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 HO) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) NOV 1984 19... JAN 1985 23... 440 3 60 <0.1 <1 <1 20 <0.01 3 0.01 MAR 14... <0.1 MAY 24... 820 4 40 <0.1 <1 <1 60 <0.01 <1 0.02 AUG 13... 95 RIO GRANDE DE MANATI BASIN 50035000 RIO GRANDE DE MANATI AT CIALES, PR LOCATION.--Lat 18°19° 26", long 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 sq mi (332 sq km), excludes 6.0 sq mi (16.6 aq km), the runoff from which is diverted through Gubineo 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 September 1960 (monthly discharge measurements only); October 1960 to current year. Equivalent record from January 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 sq mi (342 sq km). GAGE.--Water-stage recorder. Elevation of gage is 140 ft (43 m), from topographic nap. Prior to Apr. 1, 1962 , staff gage, read twice daily, at site 100 ft (30 m) 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 18-30. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--25 years (1961-86), 262 ou ft/s (7.420 cu m/s), 27.80 in/yr (706 mm/yr), 189,800 acre-ft/yr (234 cu hm/yr); median of yearly mean discharges, 250 ou ft/s (7.08 ou m/s), 181,000 acre-ft/yr (220 ou hm/yr). The median figure published in the 1984 report was in error; the correct median of the yearly mean discharge was, 240 cu ft/s (6.80 ou m/s), 174,000 acre-ft/yr (210 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 125,000 cu ft/s (3,540 ou m/s), Oct. 9, 1970, gage height, 24.0 ft (7.32 m), from floodmark, from rating curve extended above 3,000 cu ft/a (85.0 cu m/s) on basis of slope-area measurements of peak flow at gage heights 13.2 ft (4.02 m), 15.0 ft (4.57 m). 19.0 ft (5.79 m), and 24.0 ft (7.32 a), datum then in use; minimum discharge, 20 ou ft/s (0.566 tau 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 ka) upstream. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 7,000 cu ft/a (198 cu m/s) and maximum (4): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Nov. 3 1130 21,100 598 10.98 3.347 May 17 1630 24,400 691 11.76 3.584 May 15 2115 8,020 227 7.03 2.143 May 18 1100 *74,300 2,104 *19.62 6.980 May 17 0315 30,400 861 12.99 3.959 Minimum daily discharge, 45 cu ft/s (1.27 ou m/s), Aug. 24. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 73 61 58 61 421 479 188 420 192 5370 308 1610 212 996 189 291 266 264 231 215 116 120 110 105 97 108 95 87 85 82 189 135 111 119 100 88 130 258 124 99 191 183 271 391 248 99 98 95 92 89 65 104 71 63 60 134 97 99 78 68 6 7 8 9 10 751 586 281 472 390 874 176 2900 168 2330 167 2250 176 907 372 185 195 186 173 161 95 92 91 87 86 93 107 135 115 103 86 82 80 77 80 118 160 96 80 74 190 177 166 160 152 87 85 207 203 109 83 68 61 57 70 72 124 96 85 70 11 12 13 14 15 243 175 145 131 572 645 558 502 447 409 212 472 179 509 167 168 155 147 145 173 86 86 86 80 78 88 83 91 83 77 123 74 67 63 60 71 78 86 69 1130 147 142 136 131 125 91 87 84 78 114 129 138 121 86 69 65 62 148 156 105 16 17 18 19 20 431 1260 863 649 556 422 177 393 830 326 386 289 271 263 281 153 136 135 132 131 78 78 78 78 78 73 71 73 92 95 61 63 63 61 57 2620 13400 42700 4570 1220 118 114 135 144 116 164 112 100 84 83 61 57 54 53 53 84 163 285 226 162 21 22 23 24 25 375 337 272 249 196 237 223 223 206 214 188 206 324 305 219 131 126 121 120 120 76 75 79 102 100 81 75 70 66 64 57 107 589 497 478 779 539 429 368 330 112 108 185 183 190 81 76 89 95 77 52 52 48 45 50 1080 438 710 519 981 26 27 28 29 30 31 176 167 391 713 1310 821 550 199 285 295 402 383 237 313 205 276 --- 325 120 120 120 116 110 109 145 110 139 --- 65 335 286 590 341 373 387 164 125 105 101 --- 298 270 248 233 218 209 182 116 105 100 98 --- 72 71 94 77 113 72 49 224 129 72 691 368 344 199 200 150 129 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 13186 425 1310 58 3.32 3.83 26150 25230 8607 841 278 5370 830 205 167 6.57 2.17 7.33 2.50 50040 17070 4956 160 291 109 1.25 1.44 9830 2631 94.0 145 75 .73 .76 5220 4182 135 590 64 1.05 1.22 8290 4361 145 589 57 1.13 1.27 8650 71092 2293 42700 69 17.9 20.66 141000 4816 161 391 98 1.26 1.40 9550 3078 99.3 207 71 .78 .89 6110 3203 103 591 45 .80 .93 6350 7129 238 1080 62 1.86 2.07 14140 CAL YR 1984 WTR YR 1985 TOTAL TOTAL 77518 152470 MEAN MEAN 212 418 MAX MAX 5370 42700 MIN MIN 20 45 CFSM CFSM 1.66 3.27 IN. IN. 22.53 44.31 AC-FT AC-FT 153800 302400 96 RIO GRANDE DE MANATI BASIN 50035000 RIO GRANDE DE MANATI AT CIALES, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS 1979 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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) SEP, 06 1212 64 220 30.5 I I I 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°28'08", at bridge on Highway 149, about 800 ft (244 ) upstream fro 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 fro which is diverted to Rio Jacaguas. PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 22... 1510 308 187 7.90 24.5 21 8.8 106 10 2000 880 JAN 1985 22... 1615 122 242 8.50 23.5 10.2 120 22 K82 K30 MAR 15... 1200 74 250 8.20 25.0 3.0 9.6 116 <10 K110 K60 MAY 13... 1345 95 236 8.00 27.0 9.0 9.2 115 20 K1400 150 JUL 24... 1358 115 223 8.30 30.0 18 7.2 95 23 5800 400 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- /LARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIM- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIM- DIM- (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 804) AS CL) OCT 1984 22... 68 2 17 6.2 8.9 0.5 1.6 66 9.1 10 JAN 1985 22... 97 24 9.1 12 0.5 1.7 100 <0.5 8.9 13 MAR 15... 102 MAY 13... 93 23 8.6 12 0.6 1.8 98 <0.5 10 13 JUL 24... 91 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) 3IO2) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1984 22... 0.1 22 110 95 18 0.58 0.02 0.60 0.06 0.54 JAN 1985 22... 0.1 13 140 47 4 0.19 0.01 0.20 0.04 0.26 MAR 15... 11 0.19 0.01 0.20 0.06 0.85 MAY 13... 0.1 25 150 39 14 <0.01 0.20 0.04 JUL 24... 19 <0.01 0.20 0.10 0.8 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 1984 22... JAN 1985 22... MAR 15... MAY 13... JUL 24... 0.6 0.3 0.9 <0.1 0.9 1.2 5.3 0.5 2.2 1.1 4.9 1.1 4.9 0.05 0.03 <1 <100 <20 <1 1 10 0.03 0.07 <1 <100 <20 1 3 10 0.08 K = non-ideal count RIO GRANDE DE MANATI BASIN 98 50035500 RIO GRANDE DE MANATI AT HIGHWAY 149 AT CIALES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESS, 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 1984 22... JAN 1985 22... 340 1 20 <0.1 <1 <1 10 <0.01 1 0.02 MAR 15... 0.1 MAY 13... 800 3 60 <0.1 <1 <1 80 <0.01 4 0.02 JUL 24... RIO GRANDE DE MANATI BASIN 50035950 RIO CIALITOS AT HIGHWAY 649 AT CIALES, PR 99 WATER-QUALITY RECORDS LOCATION.--Lat 18'20'18", long 66'28°28", 100 ft (30 m) upstream from bridge on Highway 649, 0.7 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 aq km). PERIOD OF RECORD.--Water years 1969-71, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 26... 1355 23 232 8.50 24.5 5.3 8.9 107 <10 K1700 2500 JAN 1985 22... 1136 20 221 8.40 20.0 9.7 106 370 390 MAR 15... 1535 11 238 8.40 25.0 2.0 9.3 113 <10 K91 K82 MAY 13... 1700 14 250 8.00 25.0 5.1 8.2 100 17 2400 2100 JUL 24... 1600 13 8300 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 CACO3) CACO3 AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS SO4) AS CL) OCT 1984 26... JAN 1985 22... MAR 15... MAY 13... JUL 24... 89 26 5.9 10 0.5 1.5 91 6.9 10 94 102 100 3 31 6.1 10 0.4 1.6 100 <0.5 6.9 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 1984 26... 0.1 26 140 8.8 5 <0.01 0.70 0.03 0.17 JAN 1985 22... 0.89 0.01 0.90 0.04 0.26 MAR 15... 6 <0.01 0.60 0.02 0.38 MAY 13... 0.1 26 150 5.7 12 <0.01 0.50 0.02 JUL 24... 0.89 0.26 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 1984 26... JAN 1985 22... MAR 15... MAY 13... JUL 24... 0.2 0.9 4.0 0.09 -- 0.3 1.2 5.3 0.08 0.4 1.0 4.4 0.07 <0.1 0.06 <1 <100 <20 2 1 10 1.2 5.3 K = non-ideal count 100 RIO GRANDE DE MANATI BASIN 50035950 RIO CIALITOS AT HIGHWAY 649 AT CIALES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE,- MERCURY SILVER, ZINC, LIME 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 1984 26... JAN 1985 22... MAR 15... 0.1 MAY 13... 460 5 20 (0.1 <1 <1 30 <0.01 2 0.04 JUL 24... I I I 101 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 sq mi (510 aq km), approximately, of which about 38 sq mi (98 sq km) is partly or entirely noncontributing, excludes 6.0 sq mi (15.5 sq km) 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 a), fro topographic map. Prior to 1968 crest-stage gage at same site and datum 3.57 ft (1.088 ) lower. REMARKS.--Estimated daily discharges: Jan. 4-29 and Aug. 30 to Sept. 23. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--15 years (1971-86), 377 cu ft/s (10.68 cu m/s), 25.99 in/yr (660 ma/yr), 273,100 acre-ft/yr (337 cu hm/yr); median of yearly mean discharges, 340 cu ft/s (9.63 ou m/s), 246,000 acre-ft/yr (300 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 136,000 cu ft/s (3,850 ou m/s), May 18, 1985, gage height, 33.54 ft (10.223 m) from rating curve extended above 15,000 cu ft/a (425 cu m/s) on basis of slope-area measurement of peak flow; minimum discharge, 33 ou ft/s (0.935 cu m/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 cu ft/s (255 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/a) (cu m/s) (ft) (a) Date Time (cu ft/a) (cu m/s) (ft) (m) Nov. 3 1715 18,300 518 29.26 8.918 May 18 1315 *136,000 3,850 *33.54 10.223 May 17 2045 51.000 1,440 31.38 9.565 Minimum discharge, 76 cu ft/a (2.152 cu m/s), Apr. 20. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 172 151 140 137 469 644 522 5900 3380 1170 303 284 403 316 276 451 426 401 333 312 172 185 169 164 155 144 125 113 107 105 336 223 172 167 151 308 336 498 315 202 288 281 275 540 442 154 154 147 144 138 109 134 125 107 102 206 158 160 133 120 6 7 8 9 10 1150 1030 497 473 581 1200 3190 3640 3420 1330 256 243 235 243 354 273 286 274 257 241 150 145 141 137 135 123 121 209 157 132 133 125 124 121 116 170 457 234 177 155 294 278 260 249 241 135 133 167 357 183 120 118 106 100 99 125 193 156 142 122 11 12 13 14 15 383 294 251 230 340 941 748 625 672 727 771 851 391 317 291 250 234 223 220 257 136 136 131 131 137 118 107 109 106 98 165 118 106 100 97 144 139 164 137 287 228 222 214 206 200 145 135 131 125 146 145 184 220 149 125 116 112 224 235 168 16 17 18 19 20 703 711 1560 634 797 626 580 508 459 423 298 909 649 436 442 231 209 207 203 202 131 125 122 122 123 93 92 93 114 127 94 90 87 86 80 2940 23000 55900 5960 1680 191 182 180 236 186 203 206 150 136 131 110 102 97 95 94 141 244 404 326 243 21 22 23 24 25 533 467 384 363 299 395 373 356 340 400 379 358 331 471 385 202 196 189 187 187 119 114 121 150 149 108 98 91 86 83 81 102 791 1420 589 1040 734 589 508 460 175 169 185 283 212 130 120 124 149 127 94 94 92 92 98 1440 604 959 793 1320 26 27 28 29 30 31 267 251 286 981 1130 1480 652 404 545 384 332 --- 344 400 550 487 426 502 187 187 187 182 164 161 183 143 175 --- 81 250 531 567 648 507 757 367 261 204 169 --- 418 382 353 332 313 299 310 187 165 166 150 --- 115 114 132 122 142 127 97 250 251 132 804 512 671 375 356 305 245 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 17144 553 1560 137 2.81 3.24 34010 34886 1163 5900 332 5.90 6.59 69200 12901 416 909 235 2.11 2.44 25590 7519 243 451 161 1.23 1.42 14910 4001 143 186 114 .73 .76 7940 5443 176 648 81 .89 1.03 10800 7432 248 1420 80 1.26 1.40 14740 98531 3178 55900 137 16.1 18.61 195400 7184 239 540 150 1.21 1.36 14250 4622 149 357 114 .76 .87 9170 4957 160 804 92 .81 .94 9830 10796 360 1440 112 1.83 2.04 21410 CAL YR 1984 WTR YR 1985 TOTAL TOTAL 110796 215416 MEAN MEAN 303 590 MAX MAX 5900 55900 MIN MIN 34 80 CFSM CFSM 1.54 2.99 IN. IN. 20.92 40.68 AC-FT AC-FT 219800 427300 102 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 1984 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, HARD- FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR NESS INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. (MG/L DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER AS (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) CAC03) OCT 1984 09... 1216 430 232 7.60 26.5 35 3.8 47 10 6000 3500 96 DEC 04... 1400 316 248 7.90 25.5 15 7.9 96 12 K1000 K10000 100 FEB 1985 14... 1115 133 302 7.80 24.0 4.0 9.1 107 13 18000 30000 130 APR 02... 1130 216 256 7.60 24.5 30 7.7 91 14 3000 K400 100 JUN 03... 1225 272 272 7.80 28.0 7.5 8.1 102 20 3300 6000 120 AUG 01... 1105 109 346 7.80 28.5 14 7.6 96 <10 2500 K1100 140 HARD- ALKA- SOLIDS, NESS MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, RESIDUE NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, RIDE, DIS- AT 180 WATER DIS- DIS- DIS- SORP- DIS- TOTAL DIS- DIS- DIS- SOLVED DEG. C TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MG/L DIS- DATE MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L AS SOLVED CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS SO4) AS CL) AS F) SI02) (MG/L) OCT 1984 09... 5 29 5.7 9.0 0.4 1.9 91 10 11 0.1 19 164 DEC 04... 1 29 7.4 9.6 0.4 1.6 102 7.9 12 <0.1 22 154 FEB 1985 14... 2 38 8.5 12 0.5 1.8 128 8.7 13 0.1 13 181 APR 02... 10 30 7.3 10 0.4 2.0 96 25 16 0.1 21 180 JUN 03... 5 34 7.4 11 0.5 2.0 111 8.4 11 0.1 19 173 AUG 01... 12 42 8.5 12 0.5 2.0 128 10 13 0.1 21 193 SOLIDS, SOLIDS, NITRO- NITRO- NITRO- NITRO- PHOS- SUM OF SOLIDS, RESIDUE GEN, GEN, GEN, GEN,AM- PHOS- PHORUS, CONSTI- DIS- AT 106 NO2+NO3 AMMONIA AMMONIA MONIA + PHOS- PHOS- PHORUS, ORTHO, TUENTS, SOLVED DEG. C. DIS- DIS- DIS- ORGANIC PHORUS, PHORUS DIS- DIS- DIS- (TONS SUS- SOLVED SOLVED SOLVED TOTAL TOTAL TOTAL SOLVED SOLVED DATE SOLVED PER PENDED (MU/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L) DAY) (MG/L) AS N) AS N) AS NH4) AS N) AS P) AS PO4) AS P) AS P) OCT 1984 09... 140 190 76 0.75 <0.01 0.7 0.15 0.18 0.08 DEC 04... 150 131 31 0.76 0.02 0.03 0.3 0.12 0.06 0.07 FEB 1985 14... 170 65 22 0.61 0.21 0.27 1.2 0.13 0.07 0.22 APR 2... 170 105 132 1.00 <0.01 0.8 0.13 0.10 <0.01 JUN 3... 160 127 35 0.30 0.02 0.03 0.2 0.01 0.01 0.03 AUG 01... 190 57 0.42 0.03 0.04 0.7 0.14 0.43 0.06 0.06 PHATE, ALUM- BERYL- CHRO- ORTHO, INUM, ARSENIC BARIUM, LIUM, CADMIUM MIUM, COBALT, COPPER, IRON, LEAD, DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS PO4) AS AL) AS AS) AS BA) AS BE) AS CD) AS CR) AS CO) AS CU) AS FE) AS PB) OCT 1984 09... 0.25 30 <1 46 0 <1 <1 <3 7 18 <1 DEC 04... 0.21 FEB 1985 14... 0.67 <10 <1 45 0.7 <1 <1 <3 2 12 1 APR 02... -- JUN 03... 0.09 20 <1 54 <0.5 <1 2 <3 2 3 1 AUG 01... 0.18 <10 1 57 <0.5 <1 <1 <3 2 5 K = non-ideal count RIO GRANDE DE MANATI BASIN 103 50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR--Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 SEDI- MANUA- MOLYB- SELE- STRON- VANA- MENT, LITHIUM NESE, MERCURY DENUM, NICKEL, NIUM, SILVER, TIUM, DIUM, SEDI- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- RENT, CHARGE, SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SUS- SUS- DATE (UG/L (UG/L (UG/L (COIL (UG/L (UG/L (UG/L (UG/L (UG/L PENDED PENDED AS LI) AS MN) AS HG) AS MO) AS NI) AS SE) AS AG) AS SR) AS V) (MG/L) (T/DAY) OCT 1984 09... <4 17 <0.1 <10 1 <1 <1 140 9 114 132 DEC 04... 69 59 FEB 1985 14... <4 29 <0.1 <10 <1 <1 <1 190 7 24 8.6 APR 2... 94 55 JUN 3... 6 38 <0.1 <10 2 <1 <1 170 <6 85 62 AUG 01... (4 52 <10 <1 <1 <1 210 7 65 19 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 1985 03... 1225 <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 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 1985 03... <0.01 <0.01 <0.01 <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 TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UO/L) (UG/L) (UG/L) (UG/L) JUN 1985 03... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 SED. SUSP. STREAM- SEDI- SIEVE FLOW, MENT, DIAM. INSTAN- SUS- % FINER DATE TIME TANEOUS PENDED THAN (CFS) (MG/L) .062 MM OCT 1984 09... 1215 430 114 90 DEC 4... 1400 316 89 93 APR 1985 2... 1130 216 94 91 JUN 3... 1225 272 85 89 AUG 01... 1106 109 66 95 I LAGUNA TORTUGUERO BASIN 104 50038200 LAGUNA TORTUGUERO OUTLET NEAR VEGA BAJA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°28'29", long 66°26'50", at bridge on Highway 686, 4.2 i (6.8 ka) northeast of Manati, and 4.4 mi (7.1 ka) northwest of Vega Baja plaza. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1964-66, 1969-71, 1974 to current WATER-QUALITY DATA, WATER YEAR OCTOBER SPE- STREAM- CIFIC FLOW, CON- PH OXYGEN, INSTAN- DUCT- (STAND- TEMPER- DIS- DATE TIME TANEOUS ANCE ARD ATURE SOLVED (CFS) (US/CM) UNITS) (DEG C) (MG/L) year. 1984 TO SEPTEMBER OXYGEN, OXYGEN DIS- DEMAND, SOLVED CHEM- (PER- ICAL CENT (HIGH SATUR- LEVEL) ATION) (MG/L) 1985 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) STREP- TOCOCCI FECAL, BF AGAR (COLS. PER 100 ML) ALKA- LINITY WATER TOTAL FIELD MG/L AS CACO3 OCT 1984 26... 0920 16 1860 8.10 28.0 7.7 99 30 K13 23 112 JAN 1985 21... 1455 18 1600 8.20 28.0 9.7 124 44 <1 K7 121 APR 03... 1615 15 1720 8.20 28.5 8.4 109 31 21 270 120 MAY 14... 1630 13 1670 8.00 28.5 8.0 103 45 34 <1 98 AUG 19... 1745 13 1890 8.30 31.0 8.1 108 40 125 SOLIDS, NITRO- RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- SULFIDE DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, TOTAL SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L AS 8) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) OCT 1984 26... 2 0.68 0.02 0.70 0.21 0.79 1.0 1.7 7.5 JAN 1985 21... <0.5 3 0.78 0.02 0.80 0.15 0.85 1.0 1.8 8.0 APR 03... 4 0.79 0.01 0.80 <0.01 1.3 2.1 9.3 MAY 14... <0.5 5 0.59 0.01 0.60 0.12 0.48 0.6 1.2 5.3 AUG 19... 8 0.89 0.26 1.2 5.3 MANGA- METHY- BORON, COPPER, IRON, NESE, MERCURY ZINC, LENE PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL BLUE PHORUS, RECOV- RECOV- RECOV- RECOV- RECOV- RECOV- CYANIDE ACTIVE TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL PHENOLS SUB- DATE (MG/L (BOIL (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS P) AS B) AS CU) AS FE) AS MN) AS HG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1984 26... 0.01 JAN 1985 21... <0.01 80 10 90 20 20 <0.01 3 0.07 APR 03... <0.01 0.1 MAY 14... <0.01 <10 70 <10 <0.1 30 <0.01 7 0.1 AUG 19... K = non-ideal count 105 AT L ANTIC OCEAN 0382 168 039750 Laguna Torfuquero 169 0395 e 0397 151 v039650 DORADO VEGA BAJA N • 156 • 167 •70 TOA BAJA E MANATI 155• 0390 VEGA ALTA S • 62 Drainage boundaries indeterminate in limestone terrane a TOA a ALTA Limestone 038320 igneous and sedimentary rocks CIALES si COROZAL MOROVIS g‘• NARANJITO a Riit Greed* de Menetiabasin Drainage bound° y , Rio de la Plata boils L EXPLANATION A 038320 SURFACE-WATER STATION AND NUMBER A 0390 LOW-FLOW STATION AND NUMBER V 0397 QUALITY-OF-WATER STATION AND NUMBER • 70 WELL AND WELL NUMBER Map area 2 5 KILOMETERS 3 1 2 3 4 5 MILES Figure 17.--Rio Cibuco basin. I I I I I I I I I I 106 RIO CIBUCO BASIN 50038320 RIO CIBUCO BELOW COROZAL, PR LOCATION.--Lat 18021'13", long 66°20'07", Hydrologic Unit 21010001, on right bank, 150 ft (46 ) downstream from Rio Corozal, and 1.4 i (2.3 km) northwest of Corozal. DRAINAGE AREA.--15.1 sq mi (39.1 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--May 1969 to current year. GAGE.--Water-stage recorder. Elevation of gage is 196 ft (59 ), from topographic map. REMARKS.--No estimated daily discharges during water year. Records fair. AVERAGE DISCHARGE.--16 years (1970-85), 28.7 cu ft/s (0.813 cu /s), 25.81 in/yr (656 mm/yr), 20,790 acre-ft/yr (25.6 cu hm/yr); median of yearly mean discharges, 31 cu ft/s (0.88 cu /s), 22,500 acre-ft/yr (28 cu ha/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,600 cu ft/a (385 cu m/s), Nov. 7, 1979, gage height, 19.80 ft (6.035 a), from rating curve extended above 100 cu ft/s (2.83 cu /a) on basis of float and slope-area measurements of peak flow; minimum daily discharge, 1.3 cu ft/s (0.037 cu /s), July 24-26, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 cu ft/s (70.8 cu /a) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu /s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (a) Apr. 23 1500 2,510 71.1 10.79 3.289 May 18 0900 *10,800 306 *18.55 5.654 May 17 1500 7,740 219 16.29 4.965 Minimum discharge, 4.0 cu ft/s (0.113 cu /a), Aug. 23, 24, Sept. 6, 6. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 8.7 43 14 52 16 12 35 73 18 14 7.0 6.7 2 7.5 30 17 72 12 10 22 43 17 12 6.8 10 3 7.6 147 20 55 12 8.9 18 12 18 11 6.1 7.2 4 7.8 76 15 42 12 8.8 16 8.6 50 9.4 6.4 5.3 5 22 80 13 32 12 11 14 6.8 29 9.1 7.3 4.9 6 23 58 13 30 11 29 14 6.5 45 9.0 19 4.9 7 13 186 12 26 10 40 14 6.1 28 8.0 13 5.9 8 9.6 158 11 23 10 48 13 6.9 24 23 8.0 21 9 10 130 58 22 10 22 12 6.5 21 15 7.0 12 10 8.7 61 150 39 10 15 11 6.5 21 9.9 8.0 7.8 11 7.7 41 141 30 10 12 11 6.6 20 7.6 10 7.0 12 7.4 30 84 22 9.9 11 11 11 19 7.7 14 8.4 13 6.4 25 47 20 9.7 11 10 6.6 18 7.2 31 23 14 7.1 33 29 26 9.9 1.1 9 6 5.9 17 6.3 21 13 15 40 37 27 24 9.6 9.9 9 4 9.8 17 22 13 8.1 16 15 25 27 20 9.2 9.2 10 12 16 12 8.5 11 17 58 47 102 18 8.8 9.2 8.9 918 16 8.6 7.3 41 18 27 27 46 16 9.0 9.2 9.0 2370 15 8.7 6.9 88 19 14 24 37 15 11 14 8.7 277 14 10 6.0 112 20 28 20 32 14 9.4 10 8.3 189 14 14 5.3 48 21 28 18 25 13 8.3 11 7.8 46 13 9.2 7.0 26 22 18 17 27 13 8.7 10 94 39 13 8.5 6.1 19 23 11 16 23 13 12 8.5 434 34 14 22 5.2 109 24 8.9 15 40 13 19 8.1 68 30 14 15 9.2 40 25 7.4 14 22 13 17 8.2 21 28 13 10 12 31 26 28 31 28 13 17 8.6 14 26 12 8.5 9.1 23 27 11 29 66 13 15 55 9.8 24 11 9.6 62 20 28 58 21 46 12 21 24 8.7 23 9.5 9.4 16 59 29 64 15 34 12 --- 185 9.4 22 9.6 8.9 10 93 30 32 14 79 11 125 8.1 20 11 7.8 12 43 31 20 --- 69 11 99 --- 20 --- 7.6 8.1 --- TOTAL MEAN 614.8 19.8 1468 48.9 1354 43.7 734 23.7 329.5 11.8 853.5 27.6 939.6 31.3 4289.7 138 656.1 18.5 341.0 11.0 368.3 11.9 908.2 30.3 MAX 64 186 150 72 21 185 434 2370 50 23 62 112 MIN 6.4 14 11 11 8.3 8.1 7.8 5.5 9.5 6.3 5.2 4.9 CFSM 1.31 3.24 2.89 1.57 .78 1.82 2.07 9.14 1.23 .73 .79 2.01 IN. 1.51 3.62 3.34 1.81 .81 2.10 2.31 10.57 1.37 .84 .91 2.24 AC-FT 1220 2910 2690 1460 654 1690 1860 8610 1100 676 731 1800 CAL YR 1984 TOTAL 6219.8 MEAN 17.0 MAX 641 MIN 2.3 CFSM 1.13 IN. 15.32 AC-FT 12340 WTR YR 1985 TOTAL 12756.7 MEAN 34.9 MAX 2370 MIN 4.9 CFSM 2.31 IN. 31.43 AC-FT 25300 RIO CIBUCO BASIN 107 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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIE- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 14... 1030 35 347 7.80 23.0 16 8.2 95 <10 K69000 2700 JAN 1985 17... 1040 20 363 7.80 21.0 1.5 9.3 104 20 >60000 550 APR 17... 1040 9.9 394 7.60 24.5 2.1 8.7 104 10 2900 310 JUN 06... 1010 23 340 7.80 26.0 1.0 7.8 96 17 56000 6600 AUG 12... 1045 9.0 348 7.90 27.6 12 7.8 98 14 K7600 340 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIE- DIE- DIE- SORP- DIS- TOTAL SULFIDE DIE- DIE- (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 1984 14... 130 18 34 12 16 0.6 2.6 116 21 23 JAN 1985 17... 140 6 33 13 19 0.7 3.0 130 <0.5 19 24 APR 17... 141 JUN 06... 130 13 34 12 18 0.7 3.0 121 <0.5 18 22 AUG 12... 121 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIE- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIE- (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 1984 14... 0.1 28 210 19 14 1.39 0.11 1.50 0.44 0.06 JAN 1985 17... 0.2 29 220 12 10 1.24 0.16 1.40 0.39 1.3 APR 17... 17 0.79 0.21 1.00 1.10 0.9 JUN 06... 0.2 26 210 13 10 1.02 0.08 1.10 0.70 0.6 AUG 12... 13 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 1984 14... 0.5 2.0 8.9 0.28 JAN 1985 17... 1.7 3.1 14 0.33 1 100 <20 1 <1 <10 APR 17... 2.0 3.0 13 0.80 JUN 06... 1.3 2.4 11 0.15 <1 100 30 1 3 <10 AUG 12... 5.3 K = non-ideal count RIO CIBUCO BASIN 108 50038320 RIO CIBUCO BELOW COROZAL, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANUA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS 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 (UO/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 1984 14... JAN 1985 17... 460 1 90 0.2 <1 <1 30 <0.01 3 0.04 APR 17... 0.1 JUN 06... 330 2 50 <0.1 <1 <1 40 <0.01 8 0.02 AUG 12... I I I I I I I I I I I I I I 109 RIO CIBUCO BASIN 50039600 RIO CIBUCO AT VEGA BAJA, PR LOCATION.--Lat 18026'53", long 66°22'29", Hydrologic Unit 21010002, 0.6 mi (1.0 ka) downstream from Rio Indio, and 0.8 mi (1.3 km) east of Vega Baja. DRAINAGE AREA.--99.1 sq i (256.7 sq km), of which 25.4 sq i (65.8 sq km), 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 ) above mean sea level. REMARKS.--Estimated daily discharges: Dec. 1-4. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--12 years (1974-85), 122 cu ft/s (3.455 Cu m/s), 16.72 in/yr (425 am/yr), 88,390 acre-ft/yr (109 ou ha/yr); median of yearly mean discharges, 120 ou ft/s (3.40 ou m/s), 86,900 acre-ft/yr (110 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 30,300 cu ft/s (858 cu m/s), Dec. 13, 1981, gage height, 18.84 ft (5.742 ), fro rating curve extended above 3,000 cu ft/s (85.0 cu /s) on the basis of indirect measurements; inimua discharge, 6.1 cu ft/a (0.173 Cu /s), July 24, 25, 1977, gage height, 5.04 ft (1.536 ). EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Dec. 11, 1965 reached a stage of 26.2 ft (7.99 ), datum unknown, discharge about 28,000 cu ft/s (793 cu m/s). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,200 cu ft/s (90.6 cu /s) and maximum (8): Discharge Gage height Discharge Gage height Date Time (ou ft/s) (cu /s) (ft) (a) Date Time (cu ft/s) (cu /s) (ft) (a) Apr. 23 2045 8,290 235 16.76 5.108 May 18 1230 *22,200 629 *18.12 5.523 May 17 2200 14,000 396 17.46 5.322 Minimum discharge, 31 cu ft/a (0.878 cu /s), Mar. 25, 26, Aug. 23, 24. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 76 146 90 226 62 66 195 96 97 50 38 50 2 47 190 110 250 61 59 119 420 86 55 37 53 3 43 485 114 227 57 49 91 340 81 52 37 62 4 42 439 97 160 54 45 79 228 191 50 36 44 5 98 334 70 127 52 45 68 121 177 47 36 38 6 215 256 70 111 50 64 62 97 116 47 42 36 7 225 464 67 102 48 99 59 108 157 46 74 38 8 85 619 64 92 47 150 60 103 93 50 46 44 9 68 523 88 84 46 136 53 87 84 93 39 115 10 63 322 184 146 46 69 49 84 79 65 37 54 11 52 232 503 257 46 56 46 69 76 51 36 55 12 45 174 336 121 46 50 46 76 73 50 44 44 13 43 142 196 99 43 47 44 111 70 48 125 76 14 43 247 113 95 42 45 42 86 65 47 62 100 15 45 276 96 125 44 42 41 108 64 57 95 60 16 100 175 91 91 42 39 41 327 63 89 48 47 17 89 235 314 89 40 38 41 3040 61 56 40 48 18 185 171 182 85 37 39 41 10800 61 50 38 107 19 66 147 126 81 41 40 40 1460 61 46 36 232 20 74 123 141 74 45 60 39 473 60 64 34 191 21 268 116 112 72 40 44 38 363 58 50 35 79 22 101 114 126 68 39 40 120 304 57 44 35 101 23 78 110 112 67 44 36 1780 249 57 49 33 242 24 68 97 265 65 64 33 1140 215 56 78 32 171 25 54 90 140 62 66 32 288 178 55 56 46 98 26 52 118 127 61 85 32 191 164 53 48 51 72 27 105 119 196 60 83 123 140 144 52 45 241 59 28 154 119 273 58 78 209 116 130 51 44 113 95 29 373 97 164 57 --- 502 99 121 48 44 62 153 30 331 92 227 56 466 90 112 47 42 59 193 31 297 --- 333 54 443 --- 104 --- 40 74 --- TOTAL 3585 6772 5126 3322 1448 3198 5258 20317 2349 1653 1760 2757 MEAN 116 226 165 107 51.7 103 175 655 78.3 53.3 56.8 91.9 MAX 373 619 503 257 85 502 1780 10800 191 93 241 242 MIN 42 90 64 54 37 32 38 69 47 40 32 36 CFSM 1.17 2.28 1.66 1.08 .52 1.04 1.77 6.61 .79 .54 .57 .93 IN. 1.35 2.54 1.92 1.25 .54 1.20 1.97 7.63 .88 .62 .66 1.03 AC-FT 7110 13430 10170 6590 2870 6340 10430 40300 4660 3280 3490 5470 CAL YR 1984 TOTAL 30558 MEAN 83.5 MAX 858 MIN 11 CFSM .84 IN. 11.47 AC-FT 60610 WTR YR 1985 TOTAL 57545 MEAN 158 MAX 10800 MIN 32 CFSM 1.59 IN. 21.60 AC-FT 114100 RIO CIBUCO BASIN 110 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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 15... 1140 298 412 7.80 24.0 25 6.5 76 22 K9100 K1100 JAN 1985 16... 1030 90 423 7.60 21.5 1.0 7.7 86 15 K15000 K150 APR 18... 1110 41 441 7.60 26.0 3.0 4.0 49 20 4500 310 JUN 07... 1120 140 293 7.60 25.0 75 7.1 85 20 18000 26000 AUG 09... 1050 40 408 7.60 28.0 2.1 4.2 53 11 200 230 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) CACO3 AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS SO4) AS CL) NOV 1984 15... 180 19 60 7.5 13 0.4 3.4 162 19 20 JAN 1985 16... 190 15 60 9.5 15 0.5 2.2 174 <0.5 17 22 APR 18... 176 JUN 07... 130 12 40 6.3 10 0.4 2.5 114 <0.5 14 14 AUG 09... 159 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 TURNTS, 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 1984 15... 0.1 17 240 191 60 1.26 0.04 1.30 0.31 0.59 JAN 1985 16... 0.2 20 250 61 12 1.15 0.05 1.20 0.08 0.82 APR 18... 8 0.91 0.09 1.00 0.43 0.07 JUN 07... 0.1 13 170 64 145 0.95 0.05 1.00 0.16 0.54 AUG 09... 7 0.85 0.05 0.90 0.24 0.46 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 1984 15... 0.9 2.2 9.7 0.21 JAN 1985 16... 0.9 2.1 9.3 0.17 1 100 <20 2 1 <10 APR 18... 0.5 1.5 6.6 0.29 JUN 07... 0.7 1.7 7.5 0.09 <1 100 20 <1 30 10 AUG 09... 0.7 1.6 7.1 0.32 K = non-ideal count RIO CIBUCO BASIN 111 50039500 RIO CIBUCO AT VEGA BAJA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- REtOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UO/L (UO/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 1984 15... JAN 1985 16... 960 1 110 0.1 <1 <1 20 <0.01 4 0.02 APR 18... <0.1 JUN 07... 4700 4 170 <0.1 <1 <1 10 <0.01 11 0.01 AUG 09... 112 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 ka) northwest of Warner Lambert Laboratory, 0.6 mile (1.0 ka) 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 current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN COLI- STREP- HARD- SPE- DEMAND, FORM, TOCOCCI NESS STREAM- CIFIC CHEM- FECAL, FECAL, HARD- NONCARB FLOW, CON- PH TUR- OXYGEN, ICAL 0.7 KF AGAR NESS WATER INSTAN- DUCT- (STAND- TEMPER- BID- DIS- (HIGH UM-MF (COLS. (MG/L TOT FLD DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED LEVEL) (COLS./ PER AS MG/L AS (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) (MG/L) 100 ML) 100 ML) CAC03) CAC03 NOV 1984 20... 0920 0.0 425 7.20 26.5 3.4 0 30 90 250 170 21 JAN 1985 17... 1245 0.0 328 6.60 23.0 5.0 0 74 >6000 100 73 2 APR 17... 1340 0.0 550 7.00 25.0 2.0 0 20 K9700 450 ALKA- SOLIDS, MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, SUM OF CALCIUM SLUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, RIDE, DIS- CONSTI- DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- DIS- SOLVED TUENTS, SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL 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 8) AS SO4) AS CL) AS F) SI02) (MG/L) NOV 1984 20... JAN 1985 17... APR 17... 56 8.1 19 0.7 2.7 152 19 35 0.1 16 250 20 5.5 35 2 4.6 71 <0.5 4.4 53 0.1 9.0 170 177 SOLIDS, NITRO- CHRO- RESIDUE NITRO- NITRO- NITRO- NITRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, AT 105 GEN, GEN, GEN, GEN, MONIA + PHOS- TOTAL TOTAL TOTAL TOTAL DEG. C, NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE DATE PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L) AS N) AS N) AS N) AS N) AS N) AS P) AS AS) AS BA) AS B) AS CD) AS CR) NOV 1984 20... 4 0.01 <0.10 0.17 0.43 0.6 <0.01 JAN 1985 17... 21 0.01 <0.10 <0.01 2.3 0.18 2 <100 APR 17... 3 <0.01 <0.10 0.30 2.6 2.9 0.09 40 <1 <1 MANGA- METHY- COPPER, IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL TOTAL SELF- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE 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 (MG/L TOTAL STANCE AS CU) AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) NOV 1984 20... -- JAN 1985 17... <10 4500 <1 200 0.1 <1 <1 20 <0.01 8 0.06 APR 17 0.1 K = non-ideal count RIO CIBUCO BASIN 50039700 DRAINAGE DITCH AT RIO CIBUCO BELOW CENTRAL SAN VICENTE, PR 113 WATER-QUALITY RECORDS LOCATION.--Lat 18°27'44", long 66°21'52", 60 ft (18 m), above confluence with R!o 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 current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLT- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 16... 1015 8.8 436 7.20 24.5 11 0.8 9 18 550 K100 JAN 1985 17,.. 1415 11 431 7.00 23.5 1.5 1.6 19 30 35000 K73 APR 18... 1415 5.7 442 7.30 28.0 3.7 6.5 82 16 <10 K60 JUN 06... 1325 E7.0 384 7.00 28.0 1.5 2.7 74 34 K10000 250 AUG 12... 1430 3.6 563 7.80 31.0 11 6.8 90 10 210 K160 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 CACO3) CACO3 AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS SO4) AS CL) NOV 1984 16... 170 21 56 7.8 19 0.7 2.1 151 20 35 JAN 1985 17... 170 15 53 8.9 23 0.8 2.2 154 <0.5 17 36 APR 18... 166 JUN 06... 130 3 42 6.8 22 0.9 3.9 130 <0.5 9.2 30 AUG 12... 181 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 1984 16... 0.1 13 240 5.8 9 0.01 <0.10 0.21 0.89 JAN 1985 17... 0.2 13 250 7.4 6 0.01 <0.10 0.01 0.99 APR 18... 14 0.17 0.03 0.20 0.27 0.33 JUN 06... 0.2 14 210 18 0.89 0.02 <0.10 0.06 1.0 AUG 12... 12 0.89 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 1984 16... JAN 1985 17... APR 18... JUN 06... AUG 12... K = non-ideal count 0.02 0.06 1 <100 30 1 <1 <10 0.08 0.05 2 100 <20 <1 4 <10 1.1 1.0 0.6 0.8 3.5 1.1 1.2 5.3 RIO CIBUCO BASIN 114 50039700 DRAINAGE DITCH AT RIO CIBUCO BELOW CENTRAL SAN VICENTE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS 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 (110/1, (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 1984 16... JAN 1985 17... 610 <1 270 2.1 <1 <1 20 <0.01 18 0.03 APR 18... <0.1 JUN 06.., 3300 3 290 <0.1 <1 <1 30 <0.01 13 0.03 AUG 12... I I RIO CIBUCO BASIN 115 50039750 RIO C1BUCO BELOW CENTRAL SAN VICENTE, PR WATER-QUALITY RECORDS LOCAT[ON.--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 i (1.3 ka) west of Sabana, and 1.3 i (2.1 ha) northwest of Warner Lambert Laboratory. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1982 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) JAN 1985 16... 1445 72 428 7.60 22.5 1.0 7.2 82 K68000 400 MAR 28... 1200 181 352 7.40 22.5 6.0 7.3 83 19 29000 21000 JUN 07... 1500 113 319 7.60 27.0 45 7.3 90 20 20000 9000 AUG 09... 1340 16 423 7.90 29.5 11 8.1 104 13 320 250 HARD- ALKA- NESS MACNE- 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) CACO3 AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS SO4) AS CL) JAN 1985 16... 190 15 59 9.4 16 0.5 2.2 171 (0.5 17 24 MAR 28... 128 JUN 07... 130 14 43 6.6 12 0.5 2.7 121 <0.5 15 16 AUG 09... 172 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 106 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) (MU/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) JAN 1985 16... 0.2 19 250 48 12 0.87 0.03 0.90 0.06 0.84 MAR 28... 101 1.04 0.06 1.10 0.12 0.68 JUN 07... 0.1 14 180 56 98 0.86 0.04 0.90 0.10 1.2 AUG 09... 17 0.85 0.05 0.90 0.83 0.67 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) JAN 1985 16... 0.9 1.8 8.0 0.16 1 100 <20 3 <1 10 MAR 28... 0.8 1.9 8.4 0.15 JUN 07... 1.3 2.2 9.7 0.10 <1 100 20 <1 27 10 AUG 09... 1.5 2.4 11 0.19 K = non-ideal count 116 RIO CIBUCO BASIN 50039750 RIO CIBUCO BELOW CENTRAL SAN VICENTE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS 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 HO) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) JAN 1985 16... 760 1 110 0.1 <1 <1 30 <0.01 10 0.03 MAR 28... 0.2 JUN 07... 3800 4 160 <0.1 <1 <1 50 <0.01 12 0.02 AUG 09... -- PESTICIDE ANALYSES CHLOR- DI- DI- PCB, ALDRIN, DANE, DUD, DDB, 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) AUG 1985 09... 1340 <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 TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) AUG 1985 09... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 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) AUG 1985 09... <0.01 <0.01 <0.01 <0.01 <0.1 <0.1 <1 <0.01 I 117 TLANTICC OCEAN SAN JUAN •9. .150 CATAKI0 VEGA ALTA a Limestone 0469 r Igneous and sedimentary rocks Drainage boundaries indeterminate BAYAMON in limestone terrone 045 TOA ALTA Rio Lola Limestone Igneous and ‘s\ sedimentary rocks \„, \ _1 BCOROZAL Mop area SAN JUAN 042 eAGUADILLA Clay FAJARDO'', MAYAGUEZ 0. ..LEAS 044650 Poe 6 NARANJITO Cibuco DOSin Represo de Comerio 0440 IN\ Rio de Bayamon basin Drainage boundary R 0 COM RI F,:a Grande no Monat:" basin Drainage boundary .0/ BARRANOUITAS Island divide CIDRA E X PL A NA "r1 N A 0460 SURFACE-WATER STATION AND NUMBER A0458 LOW-FLOW STATION AND NUMBER 0430 QUALITY-OF-WATER STATION AND NUMBER Rib Salinas Nig. Rio Grande 70399 QUALITY-OF-WATER PARTIAL RECORD 4 5 KILOMETERS de Patillds basin 038 STATION AND NUMBER WELL AND WELL NUMBER 3 4 Toanal Rio Guo to basin Figure 18.--Rio de la Plata basin. I I I I I I 118 RIO DE LA PLATA BASIN 50043000 RIO DR 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 sq mi (141.9 sq km), excludes 8.2 sq mi (21.1 sq km) upstream fro 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 a), from topographic map. Prior to Mar. 29, 1961, wire-weight gage read twice daily at same site and datum. REMARKS.--Estimated daily discharges: Nov. 3-8 and May 19-22. Records fair except those for estimated daily discharges, which are poor. The Puerto Rico Aqueduct and Sewer Authority operates a pumping plant about 5 i (8 km) upstream which oan divert as much as 23 cu ft/s (0.66 cu /s) into Cidra Reservoir. AVERAGE DISCHARGE.--25 years (1961-85), 113 cu ft/s (3.200 cu m/a), 28.00 in/yr (711 mm/yr), 81,870 acre-ft/yr (101 cu ha/yr); median of yearly mean discharges, 88 cu ft/s (2.49 cu m/s), 63,800 acre-ft/yr (79 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 59,600 cu ft/s (1,690 cu /s), Aug. 27, 1961, gage height, 32.21 ft (9.818 a), from rating curve extended above 7,000 ou ft/s (198 ou /s) on basis of slope-area measurement; minimum daily discharge, 2.6 cu ft/s (0.074 cu /e), July 25, 1974. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,000 cu ft/s (113 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (10 Nov. 3 0715 13,300 376 15.37 4.685 May 17 1230 *26,500 751 *21.10 6.431 Apr. 23 1900 6,460 183 11.52 3.611 May 18 0830 6,290 176 11.42 3.481 Apr. 24 1800 4,330 123 10.31 3.142 May 19 1100 4,280 121 10.28 3.133 May 16 0530 6,830 193 11.76 3.581 Minimum discharge, 7.4 cu ft/s (0.210 cu m/s), Apr. 11. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 13 13 10 14 14 116 939 4280 2180 1470 76 270 260 133 105 56 61 56 59 59 31 32 31 30 29 10 9.9 12 11 10 18 12 10 9.8 8.6 165 153 147 152 149 81 77 103 90 69 25 24 24 23 23 14 14 14 14 14 13 13 13 12 10 6 7 S 9 10 19 17 17 465 366 1270 1070 812 596 354 90 82 77 81 93 60 55 48 43 42 27 26 26 26 27 11 16 19 14 13 8.7 11 13 9.3 8.0 147 146 133 121 128 62 55 61 50 50 20 18 18 18 17 13 13 14 15 15 13 13 13 22 13 11 12 13 14 15 155 64 41 82 106 246 202 161 175 341 78 69 74 71 69 43 43 42 41 40 26 26 24 23 23 12 10 8.6 8.8 9.7 8.1 8.9 9.8 12 11 138 145 162 388 1230 46 42 40 38 36 16 15 16 17 20 14 14 22 24 16 10 14 479 61 40 16 17 18 19 20 81 146 103 35 45 167 131 115 105 96 70 89 74 66 69 38 37 36 35 36 25 22 20 20 20 9.7 9.8 30 21 12 11 13 14 11 9.4 2810 4100 3720 1500 800 35 37 42 39 35 41 49 32 20 22 16 13 12 14 12 30 22 20 17 15 21 22 23 24 25 39 44 43 40 48 88 84 81 81 142 63 60 59 59 80 34 37 45 43 39 19 18 17 18 20 10 8.9 8.2 8.7 9.1 8.2 13 1230 1630 640 500 320 208 172 149 34 33 30 31 34 23 17 16 16 17 12 12 11 11 12 15 16 16 39 233 26 27 28 29 30 31 60 66 57 125 205 187 727 168 114 94 83 --- 74 67 88 63 62 62 41 43 41 36 33 31 19 22 16 --- 9.3 12 9.4 57 26 33 457 289 230 196 173 --- 135 122 110 102 94 87 33 31 27 27 26 --- 17 18 15 18 15 14 13 74 64 24 17 14 80 42 33 34 29 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 2720 87.7 465 10 1.60 1.85 5400 16488 550 4280 81 10.0 11.19 32700 2731 88.1 270 59 1.61 1.85 5420 1352 43.6 61 31 .80 .92 2680 663 23.7 32 16 .43 .45 1320 448.1 14.5 57 8.2 .26 .30 889 5082.8 169 1630 8.0 3.08 3.45 10080 18422 594 4100 87 10.8 12.51 36640 1384 46.1 103 26 .84 .94 2760 b44 20.8 49 14 .38 .44 1280 551 17.8 74 11 .32 .37 1090 1380 46.0 479 10 .84 .94 2740 CAL YR 1984 WTR YR 1985 TOTAL TOTAL 34160.7 61865.9 MEAN MEAN 93.3 142 MAX MAX 4280 4280 MIN MIN 6.2 8.0 CFSM CFSM 1.70 2.59 IN. IN. 23.19 35.21 AC-FT AC-FT 67760 102900 RIO DR LA PLATA BASIN 119 50043000 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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MO/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 08... 1430 877 216 7.80 24.5 34 7.7 95 <10 24000 640 JAN 1985 15... 1450 36 428 8.40 25.0 4.5 9.9 122 25 K930 K7 MAR 14... 1015 8.6 459 8.20 24.0 2.0 10.2 124 18 40 32 MAY 30... 1120 94 379 8.40 28.0 1.0 10.3 134 <10 3000 K16 AUG 7... 1320 7.1 516 8.40 30.0 1.1 10.3 138 11 92 590 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 MO/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 1984 8... 160 94 23 24 8.6 0.3 1.2 62 14 10 JAN 1985 15... 160 40 15 28 1 1.5 162 <0.5 18 27 MAR 14... 165 MAY 30... 140 1 36 13 25 0.9 1.8 142 <0.5 19 25 AUG 07... 166 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 1984 08... <0.1 25 140 339 82 0.57 0.03 0.60 0.15 0.65 JAN 1985 15... 0.2 17 240 24 4 1.35 0.05 1.40 0.02 0.88 MAR 14... 4 1.08 0.02 1.10 0.06 0.64 MAY 30... 0.2 20 230 57 2 0.37 0.03 0.40 0.02 0.18 AUG 07... 3 0.78 0.02 0.80 0.07 0.73 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 1984 08... 0.8 1.4 6.2 0.12 JAN 1985 15... 0.9 2.3 10 0.41 1 <100 <20 1 <1 <10 MAR 14... 0.6 1.7 7.5 0.52 MAY 30... 0.2 0.6 2.7 0.11 1 <100 40 1 <1 <10 AUG 07... 0.8 1.6 7.1 0.52 K = non-ideal count RIO DE LA PLATA BASIN 120 50043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANUA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RRCOV- RECOV- RECOV- NIUM, RRCOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (1/0/1, (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 1984 08... -­ JAN 1985 15... 240 4 20 0.1 <1 <1 30 <0.01 <1 0.05 MAR 14... 0.2 MAY 30... 60 2 20 0.1 <1 <1 20 <0.01 7 0.04 AUG 07... I RIO DE LA PLATA BASIN 50044000 RIO DE LA PLATA NEAR COMERIO, PR WATER-QUALITY RECORDS LOCATION.--Let 18°14'33", long 660 12'28", at bridge on Highway 156, 0.56 i (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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIE- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIE- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 26... 1110 132 338 8.00 25.5 14 8.4 104 12 3000 580 JAN 1985 28... 1245 65 441 8.20 23.5 1.0 9.0 107 20 5200 K60 APR 18... 1530 54 434 8.40 29.0 4.0 8.4 111 <10 K1100 K100 MAY 30... 1440 156 380 8.60 29.5 0.7 10.6 140 <10 4300 K100 JUL 30... 1155 56 401 8.20 29.0 5.1 9.6 124 36 K1700 230 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIE- DIE- SORP- DIS- TOTAL SULFIDE DIE- 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 3) AS SO4) AS CL) OCT 1984 26... 140 2 33 13 26 1 2.4 134 18 27 JAN 1985 28... 170 1 41 16 27 0.9 2.7 167 0.5 19 31 APR 18... 161 MAY 30... 160 7 38 15 23 0.8 2.8 150 19 27 JUL 30... 148 SOLIDS, SOLIDS, FLUO- SILICA, SUM OP SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIE- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIE- 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 1984 26... 0.2 25 220 80 24 1.28 0.02 1.30 0.10 0.3 JAN 1985 28... 0.2 23 260 46 26 1.18 0.02 1.20 0.10 0.3 APR 18... 8 0.66 0.04 0.70 0.09 0.71 MAY 30... 0.2 22 240 100 2 0.08 0.02 0.10 0.02 0.18 JUL 30... 2 0.49 0.01 0.50 0.04 0.56 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 (UC/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 1984 26... 0.4 1.7 7.5 0.43 JAN 1985 28... 0.4 1.6 7.1 0.24 1 100 50 1 11 10 APR 18... 0.8 1.5 6.6 0.38 MAY 30... 0.2 0.3 1.3 0.08 1 <100 50 1 2 <10 JUL 30... 0.6 1.1 4.9 0.30 K = non-ideal count RIO DR LA PLATA BASIN 122 60044000 RIO DE LA PLATA NEAR COMERIO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 ENABLE TOTAL ENABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UO/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 1984 26... JAN 1985 28... 1400 1 90 0.1 1 1 20 1.00 5 0.03 APR 18... 0.1 MAY 30... 140 4 30 <0.1 <1 <1 20 <0.01 14 0.05 JUL 30... I I RIO DE LA PLATA BASIN 50044850 RIO GUADIANA NEAR NARANJITO, PR 123 WATER-QUALITY RECORDS LOCATION.--Lat 18°18'39", long 66°13'28", at steel-cross-bridge 0.8 mi (1.3 km) northwest of Highway 164, 1.2 i (1.9 km) upstream from mouth and about 2.0 mi (3.2 ka) 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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 16... 1345 28 297 8.00 24.5 8.2 7.5 89 15 60000 K700 JAN 1985 31... 1300 7.9 330 8.20 21.5 3.6 9.9 111 26 K1500 470 APR 18... 1130 8.1 317 8.30 26.0 2.0 9.4 116 <10 480 K190 JUN 14... 1010 7.7 350 8.50 25.0 1.3 8.6 104 51 K1100 370 JUL 30... 0910 5.5 336 8.00 26.0 7.4 8.4 102 25 500 860 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 1984 16... 110 20 24 13 14 0.6 1.8 93 19 20 JAN 1985 31... 130 18 30 14 16 0.6 1.9 115 <0.5 16 23 APR 18... 123 JUN 14... 130 10 29 13 16 0.6 2.0 116 <0.5 16 21 JUL 30... 118 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) 3IO2) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) NOV 1984 16... 0.1 25 170 13 14 1.78 0.02 1.80 0.41 1.2 JAN 1985 31... 0.1 26 190 4.1 14 2.18 0.02 2.20 0.04 0.56 APR 18... 4 1.28 0.02 1.30 0.04 0.26 JUN 14... 0.2 26 190 4.0 24 JUL 30... 3 1.09 0.01 1.10 0.02 0.48 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 (MO/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 1984 16... 1.6 3.4 15 0.19 JAN 1985 31... 0.6 2.8 12 0.41 <1 100 <20 <1 4 <10 APR 18... 0.3 1.6 7.1 0.30 JUN 14... <1 100 60 1 6 <10 JUL 30... 0.5 1.6 7.1 0.30 K = non-ideal count 124 RIO DE LA PLATA BASIN 50044850 RIO GUADIANA NEAR NARANJITO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1984 16... JAN 1985 31... 840 2 50 <0.1 <1 <1 20 <0.01 0.04 APR 18... <0.1 JUN 14... 440 3 30 <0.1 <1 (1 10 <0.01 <1 0.03 JUL 30... RIO DE LA PLATA BASIN 125 50046000 RIO DR LA PLATA AT TOA ALTA, PR--Continued (National stream-quality accounting network station) WATER-QUALITY RECORDS LOCATION.--Samples collected at bridge on Highway 2, 1.2 mi (1.9 km) downstream from discharge station. PERIOD OF RECORD.--Water years 1958 to current year WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, COLI- STREP- SPE- DIS- FORM, TOCOCCI STREAM- CIFIC SOLVED FECAL, FECAL, HARD- FLOW, CON- PH TUR- OXYGEN, (PER- 0.7 KF AGAR NESS INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT UM-MF (COLS. (MG/L DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- (COLS./ PER AS (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) 100 ML) 100 ML) CAC03) OCT 1984 10... 1155 125 376 7.40 28.5 3.0 6.4 82 K13000 620 150 DEC 03... 1545 699 318 7.90 25.0 6.0 8.4 102 K9100 820 120 FEB 1985 19... 1050 18 540 7.50 25.0 1.5 5.2 62 K140 31 210 APR 01... 1245 279 398 7.80 25.5 10 7.3 88 2100 200 150 JUN 06... 1025 238 239 7.80 27.5 15 7.3 91 24000 2700 110 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, RIDE, DM- 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 1984 10... 18 40 12 21 0.8 3.8 134 19 28 0.1 19 DEC 03... 5 31 11 17 0.7 2.1 118 16 21 0.1 20 FEB 1985 19... 12 64 13 23 0.7 2.5 202 19 35 0.2 19 APR 01... 1 39 13 20 0.7 2.0 150 18 26 0.2 18 JUN 05... 9 29 8.8 15 0.6 2.3 100 17 20 0.1 17 SOLIDS, SOLIDS, NITRO- NITRO- NITRO- NITRO- PHOS- PHOS- RESIDUE SUM OF SOLIDS, GEN, GEN, GEN, GRN,AM- PHOS- PHORUS, PRATE, 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 1984 10... 209 220 71 0.23 0.16 0.21 0.6 0.24 0.19 0.18 0.55 DEC 03... 201 190 379 0.56 0.09 0.12 0.2 0.11 0.07 0.09 0.28 FEB 1985 19... 318 300 15 0.55 0.40 0.52 1.1 0.37 0.35 0.40 1.2 APR 01... 228 230 172 0.14 <0.01 1.1 0.09 0.06 0.02 0.06 JUN 05... 182 170 117 0.36 0.10 0.13 0.6 0.04 <0.01 0.02 0.06 ALUM- BERYL- CHRO- INUM, ARSENIC BARIUM, LIUM, CADMIUM MIUM, COBALT, COPPER, IRON, LEAD, LITHIUM 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 (UO/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) AS LI) OCT 1984 10... <10 2 48 <0 <1 <1 <3 6 10 <1 <4 DEC 03... FEB 1985 19... <10 1 55 1 <1 4 <3 4 23 1 14 APR 01... JUN 05... 80 <1 37 3 <1 10 <3 2 11 1 5 K = non-ideal count 126 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 1984 TO SEPTEMBER 1985 SEDI- MANGA- MOLYB- SELE- STROM- VANA- MENT, NESE, MERCURY DENUM, NICKEL, NIUM, SILVER, TIUM, DIUM, ZINC, SEDI- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- MENT, CHARGE, SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SUS- SUS- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L PENDED PENDED AS MN) AS HG) AS MO) AS NI) AS SE) AS AG) AS SR) AS V) AS ZN) (MG/L) (T/DAY) OCT 1984 10... 92 0.3 <10 5 <1 <1 200 <6 19 36 12 DEC 03... 48 91 FEB 1985 19... 260 0.1 <10 10 <1 <1 310 <6 7 11 0.53 APR 01... -- 108 81 JUN 05... 11 (0.1 <10 2 <1 <1 120 7 9 56 35 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 1985 05... 1025 (0.1 <0.01 <0.1 <0.01 (0.01 <0.01 0.02 (0.01 HEPTA- METH- ENDO- HEPTA- CHLOR MALA- OXY- SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UO/L) (UO/L) (UG/L) (UG/L) (UG/L) (UG/L) (UO/L) (UO/L) JUN 1986 5... <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- TOY- TOTAL THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI- DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION (UO/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1985 6... <0.01 <0.01 (0.01 <0.01 <0.1 <0.1 <1 <0.01 BED. SUSP. STREAM- SEDI- SIEVE FLOW, MENT, DIAM. INSTAN- SUS- % FINER DATE TIME TANEOUS PENDED THAN (CFS) (MG/L) .062 MM OCT 1984 10... 1156 125 36 100 DEC 03... 1545 699 48 100 APR 1985 01... 1245 279 108 79 JUN 05... 1025 238 55 81 127 RIO DE LA PLATA BASIN 50046900 RIO DE LA PLATA AT HIGHWAY 2 NEAR TOA ALTA, PR (Formerly published as Rio de la Plata at 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 sq mi (539 sq km), excludes 8.2 sq mi (21.2 sq km) upstream from Lago Carite, flow from which is diverted to Rio Guamani. (Area at site used prior to September 25, 1984, 200 sq mi (518 aq km). 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.--No estimated daily discharges during water year. Records fair. Regulation at all stages by Puerto Rico Aqueduct and Sewer Authority reservoir upstream from gage. AVERAGE DISCHARGE.--25 years (1961-85), 274 cu ft/s (7.760 cu m/s), 18.60 in/yr (472 mm/yr), 198,500 acre-ft/yr (245 cu hm/yr); median of yearly mean discharges, 220 cu ft/s (6.23 cu m/s), 159,000 acre-ft/yr (200 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 95,500 cu ft/a (2,700 cu m/s), Sept. 6, 1960, gage height, 36.35 ft (11.079 m), from floodmark, from rating curve extended above 12,000 cu ft/s (340 cu m/s) on basis of contracted-opening measurement of peak flow; minimum discharge, 2.2 cu ft/s (0.062 cu m/s), Apr. 25, 1984. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate discharges and elevations to gage datum of major floods, as pointed out by local residents are as follows: Sept. 13, 1928, 120,000 cu ft/a (3,400 cu m/s), gage height, 37.4 ft (11.40 m); June 16, 1943, 82,000 cu ft/s (2,320 cu m/s), gage height, 34.4 ft (10.48 m). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 6,000 cu ft/a (170 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Nov. 3 1300 *56,600 1,600 *23.33 7.111 Apr. 30 1615 9,870 280 15.25 4.648 Nov. 5 2130 17,400 493 18.05 5.502 May 16 1330 6,410 182 12.96 3.950 Nov. 7 0415 11,200 317 15.89 4.843 May 17 1845 29,200 827 20.44 6.230 Apr. 25 0016 6,990 198 13.42 4.090 May 18 1430 38,700 1,100 21.61 6.587 Minimum discharge, 9.5 cu ft/s (0.269 cu m/s), July 10. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 86 70 54 50 46 211 230 17800 5340 7330 180 181 585 400 287 270 332 311 221 190 47 43 43 52 45 173 107 73 51 37 262 65 43 36 31 412 542 296 149 113 155 153 151 468 237 25 24 23 19 18 14 14 11 10 11 81 134 94 68 64 6 7 8 9 10 73 92 89 84 128 6080 7690 3280 2480 1240 251 221 206 215 364 175 172 157 145 512 36 28 25 22 22 53 100 117 122 97 29 32 39 28 23 89 70 60 53 51 152 136 124 118 107 16 14 12 11 11 18 43 16 15 13 82 76 59 99 41 11 12 13 14 15 193 195 190 174 171 862 685 572 512 681 775 345 259 202 182 276 155 131 120 120 21 19 18 17 17 73 60 78 54 36 29 35 26 21 19 49 59 64 52 517 101 94 86 78 70 12 12 13 12 15 12 13 24 27 39 53 41 445 976 235 16 17 18 19 20 172 160 198 302 420 586 559 443 365 314 175 884 494 263 225 114 106 100 95 87 17 17 18 19 20 30 26 25 26 49 19 17 20 15 14 3960 15600 24400 8260 1510 63 58 53 55 56 19 13 13 17 61 20 19 20 25 28 134 120 206 144 97 21 22 23 24 25 420 221 198 172 151 266 240 226 210 194 195 203 171 217 186 80 75 70 65 61 15 16 21 32 32 47 38 29 21 15 15 38 602 1090 2340 844 613 458 360 319 53 49 46 46 45 46 37 34 39 39 28 28 38 40 111 60 43 83 77 109 26 27 28 29 30 31 135 131 234 228 202 188 783 528 301 236 200 --- 192 222 337 308 337 416 60 58 56 52 48 42 28 63 149 --- 15 30 39 360 643 638 86 57 48 42 2280 --- 258 218 212 199 176 160 43 39 36 31 29 --- 37 30 25 22 18 15 84 234 96 74 60 90 547 217 275 213 150 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 5227 169 420 46 .84 .97 10370 60444 2015 17800 194 10.1 11.24 119900 9478 306 884 171 1.53 1.76 18800 4456 144 512 42 .72 .83 8840 902 32.2 149 15 .16 .17 1790 3262 105 643 15 .52 .61 6470 7401 247 2340 14 1.23 1.38 14680 60123 1939 24400 49 9.69 11.18 119300 2932 97.7 468 29 .49 .55 5820 702 22.6 61 11 .11 .13 1390 1275 41.1 234 10 .21 .24 2530 5023 167 976 41 .83 .93 9960 CAL YR 1984 WTR YR 1985 TOTAL TOTAL 93438.9 161225 MEAN MEAN 255 442 MAX MAX 17800 24400 MIN MIN 2.7 10 CFSM CFSM 1.27 2.21 [N. IN. 17.38 29.99 AC-FT AC-FT 185300 319800 • 129 ATLANTIC OCEAN SAN JUAN 49920 • 66 ** Drainage boundaries indeterminate in limestone terrane Limestone l9nerws_and • sedimentary rocks I TRUJILLO ALTO s Drainage boundary Drainage boundary AGUAS BUENAS N L. Rio de la Plato basin •. Rio Grande de Loiza basin L. Lugo d C trir 42 CIDRA EXPLANATION A 0490 LOW—FLOW STATION AND NUMBER V 0488 QUALITY—OF—WATER STATION AND NUMBER 42 WELL AND WELL NUMBER • Aotaii) area i••••4 . I 5 OtiLOMETERS r k.CAGUJO. AY A 3 4 5 Y.MLES Figure 19.--Rio Hondo to the Rio Puerto Nuevo basins. I I RIO HONDO BASIN 130 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 a) below junction with Rio Hondo, 0.9 i (1.5 km) downstream fro bridge on de Diego Expressway and 1.1 ai (1.8 ka) above mouth. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI CIFIC SOLVED CHEM- FECAL, FECAL, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 27... 0915 2600 7.20 26.5 50 0 210 1400000 30000 FEB 1985 01... 1355 7600 7.60 28.0 4.5 0 -- K1500000 63000 APR 25... 1510 2600 7.20 29.5 15 3.3 44 42000 <1000 JUN 21... 1330 17400 7.80 33.5 7.0 3.0 44 420000 <10000 AUG 28... 0850 1720 7.60 26.5 40 1.2 15 35 K830000 3700 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, 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/I, AS (MG/L (MG/L (MG/L RATIO (MG/L MO/L AS (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS 804) NOV 1984 27... 290 200 37 49 390 10 19 91 110 FEB 1985 01... 820 610 82 150 1000 15 57 208 1.0 310 APR 25... 84 JUN 21... 2000 1800 140 390 3000 30 120 192 0.6 810 AUG 28... 85 SOLIDS, SOLIDS, CHLO- FLUO- SILICA, SUM OF RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, RIDE, DIS- CONSTI- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- DIS- SOLVED TUENTS, DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED SOLVED (MG/L DIS- SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/I. (MG/L AS SOLVED PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS CL) AS F) SI02) (MG/L) (MG/L) AS N) AS N) AS N) AS N) AS N) NOV 1984 27... 770 0.2 8.9 1400 66 0.10 <0.10 3.50 2.5 FEB 1985 01... 2200 0.5 18 3900 19 0.06 0.04 0.10 15.0 1.0 APR 25... 28 0.14 0.06 0.20 1.50 0.5 JUN 21... 6900 0.7 13 10000 38 0.02 <0.10 10.0 AUG 28... 39 0.16 0.04 0.20 1.10 0.9 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 1984 27... 6.0 0.66 FEB 1985 01... 16 16 71 3.80 1 100 550 3 29 70 APR 25... 2.0 2.2 9.7 0.31 JUN 21... 3.0 2.90 3 100 1500 2 38 50 AUG 28... 2.0 2.2 9.7 0.25 K = non-ideal count RIO HONDO BASIN 131 50047530 RIO HONDO AT FLOOD CHANNEL NEAR CATANO, PR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1984 27. FEB 1985 01... APR 25... JUN 21... AUG 28... 1000 10 600 0.9 <1 1 90 0.06 1.8 <0.1 810 8 440 1.6 <1 1 80 0.06 <1 I I RIO DE BAYAMON BASIN 132 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 i (4.7 ka) west of Aguas Buenas playa. DRAINAGE AREA.--18.5 sq i (47.9 sq ka). PERIOD OF RECORD.--Water years 1958-65, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIE- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANROUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 13... 1020 46 231 7.80 21.5 28 8.4 97 22 K10000 400 JAN 1986 16... 1045 26 262 8.00 20.0 4.5 10.6 118 17 580 510 MAR 14... 1330 25 248 8.00 22.0 4.5 9.4 109 18 3600 8330 JUN 12... 1130 42 206 7.80 24.5 9.3 113 230 720 AUG 07... 1005 28 259 7.90 25.5 7.0 8.1 100 11 270 340 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIE- SORP- DIE- 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 1984 13... JAN 1985 15... MAR 14... JUN 12... AUG 07... 84 8 19 8.8 12 0.6 2.5 76 12 16 91 4 21 9.3 12 0.6 1.7 87 <0.5 9.5 15 97 69 94 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIE- CONSTI- DIE- 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) 8'02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) NOV 1984 13... <0.1 21 140 17 5 0.74 0.06 0.80 0.09 1.3 JAN 1985 15... 0.1 22 140 10 5 0.49 0.01 0.50 0.01 1.2 MAR 14... 6 <0.01 0.30 0.02 0.38 JUN 12... 0.28 0.02 0.30 0.06 0.34 AUG 07... 6 <0.01 0.30 0.03 0.37 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 1984 13... 1.4 2.2 9.7 <0.01 JAN 1986 15... 1.2 1.7 7.5 0.05 <1 <100 <20 2 4 <10 MAR 14... 0.4 0.7 3.1 <0.01 JUN 12... 0.4 0.7 3.1 0.02 AUG 07... 0.4 0.7 3.1 0.03 K = non-ideal count RIO DR BAYAMON BASIN 133 50047600 RIO DE BAYAMON NEAR AGUAS BUENAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1984 13... JAN 1985 15... 620 7 60 0.1 <1 <1 40 <0.01 3 0.02 MAR 14... 0.2 JUN 12... AUG 07... I I RIO DE BAYAMON BASIN 134 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 ai (0.3 km) upstream from Rio de Bayamon, and 2.3 i (3.7 km) southeast of Bayamon plaza. DRAINAGE AREA.--73.2 sq i (189.6 sq km). PERIOD OF RECORD.--Water years 1958, 1964, 1971-73, 1976, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIPIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 29... 1410 47 349 7.40 27.6 4.8 60 K860000 43000 JAN 1985 29... 1235 21 444 7.60 24.5 4.0 4.9 58 33 60000 300 APR 16... 1530 20 552 7.50 29.0 5.0 2.9 38 23 K16000 3100 JUN 13... 1210 23 442 7.60 29.0 16 2.9 37 62 5200 K1600 JUL 31... 1235 19 496 7.70 30.0 14 7.6 99 23 580000 K12000 ALKA- MAGNE- SODIUM POTAS- LINITY CHLO- HARD- CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS (MOIL (MG/L (MG/L RATIO (MG/L MG/L AS (MOIL (MG/L (MOIL CAC03) AS CA) AS MG) AS NA) AS K) CAC03 AS 8) AS SO4) AS CL) OCT 1984 29... 128 JAN 1986 29... 160 41 13 29 1 3.6 156 <0.5 15 38 APR 16... 184 JUN 13... 150 40 11 29 1 4.1 167 <0.5 26 39 JUL 31... 156 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 (MOIL (MOIL (MG/L (MG/L AS F) $102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1984 29... 0.50 0.10 0.60 2.80 1.8 JAN 1985 29... 0.1 27 260 15 13 0.26 0.04 0.30 1.80 0.5 APR 16... 8 0.03 <0.10 6.10 1.2 JUN 13... 0.3 17 260 16 6 0.17 0.03 0.20 2.00 5.0 JUL 31... 0.07 0.03 0.10 2.40 1.0 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- NIOS- 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 (MOIL (UG/L (UG/L (UG/L (UG/L (UG/L (UO/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1984 29... 4.6 5.2 23 0.61 JAN 1985 29... 2.3 2.6 12 0.68 100 30 1 <1 <10 APR 16... 6.3 0.99 JUN 13... 7.0 7.2 32 0.36 3 200 20 1 4 90 JUL 31... 3.4 3.5 15 0.97 K = non-ideal count RIO DE BAYAMON BASIN 135 50047990 RIO GUAYNABO NEAR BAYAMON, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS 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 1984 29... JAN 1985 29... 1100 3 360 <0.1 <1 10 <0.01 10 0.36 APR 16... 0.1 JUN 13... 49000 23 2400 0.3 <1 <1 130 <0.01 4 0.24 JUL 31... I 136 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 i (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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 20... 1410 102 370 7.60 26.0 14 4.8 58 25 K6900 K500 JAN 1985 29... 0930 64 435 7.50 22.0 3.0 4.8 54 26 400000 2500 APR 16... 1130 46 430 7.30 25.0 7.5 4.5 54 16 53000 K1800 JUN 18... 1145 38 442 7.60 28.0 5.0 5.2 66 28 K1000 K450 JUL 31... 0935 32 463 7.40 27.0 13 3.3 41 17 240000 9600 HARD- ALKA- NESS MAGNE- SODIUM POTAS- 1.INITY 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 1984 20... 140 8 37 12 21 0.8 2.8 134 18 28 JAN 1985 29... 160 1 40 14 27 1 3.3 157 <0.5 17 34 APR 16... 157 JUN 18... 160 14 42 13 27 1 3.4 144 <0.5 26 35 JUL 31... 159 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 1984 20... 0.1 27 230 62 39 0.94 0.16 1.10 0.55 0.35 JAN 1985 29... 0.1 26 260 44 12 0.40 0.10 0.50 1.70 0.4 APR 16... 25 0.21 0.09 0.30 1.40 3.3 JUN 18... 0.2 26 260 27 14 1.06 0.15 1.20 1.50 1.9 JUL 31... 0.28 0.12 0.40 2.50 0.8 NITRO- CHRO- GRN,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 1984 20... 0.9 2.0 8.9 0.28 JAN 1985 29... 2.1 2.6 12 0.72 100 40 1 <1 <10 APR 16... 4.7 5.0 22 0.63 JUN 18... 3.4 4.6 20 0.89 1 100 30 1 16 <10 JUL 31... 3.3 3.7 16 1.00 K = non-ideal count RIO DE BAYAMON BASIN 137 50048610 RIO DE BAYAMON AT FLOOD CHANNEL AT BAYAMON, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1986 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, UNE 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 (UO/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 1984 20... JAN 1985 29... 1100 2 380 <0.1 <1 <10 <0.01 10 0.09 APR 16... 0.2 JUN 18... 810 <1 480 <0.1 <1 <1 30 <0.01 11 0.54 JUL 31... CHLOR- DI- DI- PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, BLDRIN 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 1985 31... 0935 <.1 <.01 <.1 (.01 <.01 <.01 <.19 <.01 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 1985 31... <.01 <.01 <.01 <.01 <.01 <.01 <.11 <.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TUX- 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 1985 31... <.01 <.01 <.01 <.01 (.1 (.1 < 1 (.01 I RIO PUERTO NUEVO BASIN 138 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 vi (0.8 km) west of Highway 176, and 2.5 i (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 ourrent year. WATER QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 22... 1310 14 349 7.70 25.0 14 7.8 94 12 K66000 8500 JAN 1985 21... 1330 8.5 381 8.00 24.0 1.5 11.1 131 18 3000 850 APR 17... 1030 6.5 381 7.70 23.5 10 7.2 85 10 K67000 24000 JUL 25... 1120 6.9 403 7.60 27.0 17 11.4 141 26 56000 9400 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 CACO3) CACO3 AS CA) AS MG) AS NA) AS K) CACO3 AS 3) AS 904) AS CL) OCT 1984 22... 120 10 31 11 22 0.9 2.6 113 22 26 JAN 1985 21... 140 3 36 12 25 1 2.0 136 <0.5 17 28 APR 17... 147 JUL 25... 141 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 (MOIL (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1984 22... 0.1 28 210 8.0 16 0.78 0.02 0.80 0.09 0.61 JAN 1985 21... 0.2 35 240 5.4 46 0.98 0.02 1.00 <0.01 APR 17... 16 0.88 0.12 1.00 0.80 2.2 JUL 25... 19 0.75 0.05 0.80 0.41 0.39 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 1984 22... 0.7 1.5 6.6 0.10 JAN 1985 21... 0.7 1.7 7.6 0.20 1 100 <20 1 <1 <10 APR 17... 3.0 4.0 18 0.22 JUL 25... 0.8 1.6 7.1 0.17 K = non-ideal count RIO PUERTO NUEVO BASIN 139 50048800 RIO PIEDRAS NEAR RIO PIEDRAS, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 HO) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1984 22... JAN 1985 21... 3300 2 210 0.1 <1 <1 20 <0.01 3 0.01 APR 17... 0.1 JUL 25... CHLOR- DI- DI- PCB, ALDRIN, DANE, DDD, DDB, 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 1985 25... 1120 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 0.04 <0.01 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 1985 25... <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- 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 1985 25... <0.01 <0.01 <0.01 <0.01 <0.1 <0.1 <1 <0.01 RIO PUERTO NUEVO BASIN 140 50049100 RIO PIEDRAS AT HATO REY, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°24'34", long 66°04'10", at bridge on Avenida Piniero at Expreso Las Americas, and 0.8 mi (1.3 km) southwest of Ilato Rey. DRAINAGE AREA.--15.4 sq mi (39.9 aq km). PERIOD OF RECORD.--Water years 1971 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLT- STREP- SPE- DIE- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 22... 1025 26 300 7.60 25.5 12 7.4 89 15 320000 3500 JAN 1985 21... 1105 17 445 7.60 23.5 1.0 6.9 80 27 250000 4800 APR 17... 1430 47 327 7.50 27.0 15 5.3 66 30 K900000 94000 JUN 11... 1230 18 414 8.20 30.0 1.1 8.5 112 20 210000 4100 11... 1425 414 8.20 30.0 8.9 119 JUL 25... 1400 15 427 7.80 31.0 14 10.6 140 30 320000 3500 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIE- DIE- DIS- SORP- DIS- TOTAL SULFIDE DIE- 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 CACO3) CACO3 AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS SO4) AS CL) OCT 1984 22... 140 7 40 10 23 0.9 3.3 134 25 24 JAN 1985 21... 160 44 12 30 1 2.9 162 <0.5 17 32 APR 17... 130 JUN 11... 140 40 10 26 1 3.3 150 <0.5 19 28 11... -- -- 92 JUL 25... 153 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIE- 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 1984 22... 0.2 JAN 1985 21... 0.2 APR 17... JUN 11... 0.1 11... JUL 25... K = non-ideal count 24 230 16 16 0.75 0.05 0.80 0.10 0.7 32 270 12 5 1.14 0.26 1.40 1.10 1.2 68 0.51 0.09 0.60 1.30 3.4 27 240 12 13 -- -- -- -- 0.67 0.13 0.80 0.75 0.45 4 1.07 0.23 1.30 0.54 0.56 RIO PUERTO NUEVO BASIN 141 50049100 RIO PIEDRAS AT HATO REY, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1984 22... 0.8 1.6 7.1 0.19 JAN 1985 21... 2.3 3.7 16 0.52 2 100 30 <1 <1 <10 APR 17... 4.7 5.3 23 0.49 JUN 11... -- 1 100 110 <1 <1 <10 11... 1.2 2.0 8.9 0.48 JUL 25... 1.1 2.4 11 0.51 20 MANGA- METHY- IRON, LEAD, NESS, MERCURY SILVER, ZINC, LENS 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 1984 22... JAN 1985 21... 530 1 230 0.2 <1 <1 10 <0.01 3 0.06 APR 17... 0.3 JUN 11... 590 2 190 0.1 <1 <1 30 <0.01 8 0.1 11... -- -- -- -- -- -- -- -- JUL 25... 142 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 ai (0.3 ka) east of Cano de Martin Pena, and 650 ft (200 11) south of Isla Guachinango. DRAINAGE AREA.--Indeterainate. PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, COLI- STREP- ALKA- SPE- DIS- FORM, TOCOCCI LINITY CIFIC SOLVED FECAL, FECAL, WATER SAM- CON- PH OXYGEN, (PER- 0.7 KF AGAR TOTAL PLING DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. FIELD DATE TIME DEPTH ANCE ARD ATURE SOLVED SATUR- (COLS./ PER MG/L AS (FEET) (US/CM) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CACO3 NOV 1984 21... 1015 1.00 14100 8.10 27.5 2.2 29 600000 6100 146 FEB 1985 01... 1015 1.00 17200 8.30 24.5 1.8 23 3330000 48000 121 APR 25... 1030 1.00 26000 8.80 28.5 11.0 165 K13000 3600 144 JUN 21... 0930 1.00 27700 8.00 28.5 0.3 4 42000 K5500 144 AUG 20... 1000 1.00 22100 9.00 28.0 4.3 58 120000 36000 103 SOLIDS, NITRO- RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- SULFIDE DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, TOTAL SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L AS S) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) NOV 1984 21... 10 <0.01 <0.10 1.20 4.5 5.7 FEB 1985 01... 0.06 0.05 0.10 0.84 3.3 4.1 4.2 19 APR 25... 61 <0.01 <0.10 0.03 2.2 2.2 JUN 21... <0.5 66 0.02 <0.10 2.50 5.4 7.9 AUG 20... 55 0.03 <0.01 0.36 6.3 6.7 MANGA- METHY- BORON, COPPER, IRON, NESE, ZINC, LENE PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL CARBON, BLUE PHORUS, RECOV- RECOV- RECOV- RECOV- RECOV- ORGANIC ACTIVE TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL PHENOLS SUB- DATE (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS P) AS B) AS CU) AS FE) AS MN) AS ZN) AS C) (UG/L) (MG/L) NOV 1984 21... 0.66 13 FEB 1985 01... 0.68 1400 30 610 160 40 15 0.44 APR 25... 0.51 8.6 JUN 21... 0.69 30 280 190 20 12 7 0.75 AUG 20... 0.82 K = non-ideal count I RIO PUERTO NUEVO BASIN 143 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 i (0.8 km) west of Puente de is Constituoion, 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 1984 TO SEPTEMBER 1985 OXYGEN, COLI- STREP- ALKA- SPE- DIS- FORM, TOCOCCI LINITY CIFIC SOLVED FECAL, FECAL, WATER SAM- CON- PH OXYGEN, (PER- 0.7 KF AGAR TOTAL PLING DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. FIELD DATE TIME DEPTH ANCE ARD ATURE SOLVED SATUR- (COLS./ PER MG/L AS (FEET) (US/CM) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CAC03 NOV 1984 21... 1310 1.00 21100 7.60 28.0 1.9 26 K120000 3500 144 FEB 1985 01... 1210 1.00 19000 7.70 25.5 2.2 28 K830000 54000 130 APR 25... 1300 1.00 37000 7.20 29.0 0 210000 28000 148 JUN 21... 1110 1.00 31000 7.80 28.5 5.3 74 42000 K730 142 AUG 27... 1300 1.00 5690 7.60 27.0 0.8 10 980000 300000 75 SOLIDS, NITRO- RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- SULFIDE DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, TOTAL SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L AS 5) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) NOV 1984 21... 10 0.14 0.06 0.20 1.30 0.4 1.7 1.9 8.4 FEB 1985 01... <0.5 19 0.21 0.09 0.30 1.10 2.0 3.1 3.4 15 APR 25... 0.15 0.05 0.20 1.70 1.4 3.1 3.3 15 JUN 21... 0.6 14 <0.01 <0.10 0.53 1.2 1.7 AUG 27... 222 0.17 0.03 0.20 1.20 1.2 2.4 2.6 12 MANGA- METHY- BORON, COPPER, IRON, NESE, ZINC, LENE PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL CARBON, BLUE PHORUS, RECOV- RECOV- RECOV- RECOV- RECOV- ORGANIC ACTIVE TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL PHENOLS SUB- DATE (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS P) AS B) AS CU) AS FE) AS MN) AS ZN) AS C) (UG/L) (MG/L) NOV 1984 21... 0.37 5.8 FEB 1985 01... 0.59 1600 40 710 350 50 9.2 3 0.53 APR 25... 0.50 4.2 JUN 21... 0.26 3300 40 8800 180 40 3.6 <1 AUG 27... 0.37 9.5 K = non-ideal count 145 SAN JUAN LOIZA ALDEA Coastal basin 50 Coastal basin 0° CAR LINA 0620 RIO GRANDE 610 Quebrado • 02 0591 TRUJI. LO ALTO Rib Herrera 1.\) basin Q. 061 612 Rio Espiritu ) Santo basin Logo Lo4a 1 55310 7025 AGUAS BUENAS GURABO 0569 (s.'t 565 ` 1 JUNCOS r 0564 055 s'7 de /e 0,, bra SAN LAS \. LORENZO bAonst, n Ruiz PIEDRAS —) 111 0511:0 ‘!.." ..—Drainage boundary 051150 051310 r' Rib de la Plata 0511 basin Ri'o Humacao basin •• EXPLANATION \\N • g509 SURFACE—WATER STATION (.. AND NUMBER A0619 LOW—FLOW STATION AND NUMBER Rib Grande de Patinas basin r) v0554 QUALITY—OF—WATER STATION AND NUMBER Map area RIO Guoycines basin V00588 QU AP A L IRTTYI—AOLFR— EWCAOTREDR SAN JUAN STATION AND NUMBER • 52 WELL AND WELL NUMBER I 2 I J! 4I 6 KILOMETERS 11 1 I 2 3 4 6 MILES • Figure 20.--Rio Grande de Loiza basin. I 146 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 i (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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCC1 STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER­ BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 24... 0930 6.5 559 7.40 26.5 5.5 3.2 40 57 1700000 610000 JAN 1985 26... 0945 11 428 7.50 23.5 10 3.2 37 43 150000 730000 MAR 12... 0945 9.9 566 7.30 24.5 1.5 0 67 260000 500000 MAY 17... 1355 11 428 7.30 26.0 5.0 2.8 34 55 300000 300000 AUG 23... 1145 9.8 592 7.80 8.0 3.0 0.9 8 81 56000 ALKA- MAGNE- SODIUM POTAS- LINITY CHLO- HARD- CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS DIS- DIE- DIS- SORP- DIE- TOTAL SULFIDE DIS- DIE- (MG/L SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CACO3) AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS SO4) AS CL) OCT 1984 24... 160 50 7.5 41 1 5.3 171 36 46 JAN 1985 26... 150 45 10 29 1 4.0 172 <0.5 18 36 MAR 12... 198 MAY 17... 130 41 6.5 28 1 4.5 134 <0.5 31 28 AUG 23... 189 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIE- CONSTI- DIE- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIE- (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 1984 24... 0.2 19 310 5.4 <1 0.09 0.11 0.20 5.00 4.2 JAN 1985 26... 0.2 25 270 8.0 16 0.31 0.09 0.40 2.70 0.3 MAR 12... 13 0.04 <0.10 3.60 3.4 MAY 17... 0.1 15 230 7.0 52 0.44 0.16 0.60 2.70 3.2 AUG 23... 11 0.02 <0.10 8.80 5.2 RIO GRANDE DE LOIZA BASIN 147 50050300 QUEBRADA BLASINA NEAR CAROLINA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1984 24... 9.2 9.4 42 1.50 JAN 1985 26... 3.0 3.4 15 0.92 2 100 30 <1 5 20 MAR 12... 7.0 1.40 MAY 17... 5.9 6.5 29 1.10 1 100 50 1 <1 10 AUG 23... 14 1.90 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL /TOTAL TOTAL SEWS- 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 1984 24... JAN 1985 26... 750 1 390 <0.1 <1 <1 20 <0.01 5 0.28 MAR 12... 0.4 MAY 17... 2600 7 440 0.3 <1 <1 30 <0.01 13 0.85 AUG 23... I I I I 148 RIO GRANDE DR 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 sq mi (15.54 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1977 to current year. GAGE.--Water-stage recorder. Elevation of gage is 175 ft (53 ), from topographic map. REMARKS.--No estimated daily discharges during water year. Records fair. AVERAGE DISCHARGE.--8 years (1978-85), 31.1 cu ft/s (0.881 cu /s), 70.39 in/yr (1,788 mm/yr), 22,530 acre-ft/yr (27.8 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 11,700 cu ft/s (331 cu m/s), Nov. 5, 1983, gage height, 14.78 ft (4.505 m), from rating curve extended above 500 cu ft/s (14.2 cu m/s) on basis of step-backwater analysis; minimum discharge, 2.8 cu ft/s (0.079 cu m/s), May 5, 6, 1979. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 cu ft/s (56.6 cu /s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Oct. 9 1400 2,920 82.7 9.18 2.798 May 18 0715 *4,290 121 *10.37 3.161 Nov. 3 0800 3,380 95.7 9.61 2.929 July 17 0700 2,860 81.0 9.12 2.780 Nov. 5 1145 2,650 75.0 8.91 2.716 Sept. 25 0100 3,030 85.8 9.29 2.832 Apr. 23 1600 2,950 83.5 9.21 2.807 Minimum discharge, 7.2 cu ft/s (0.204 cu /s), Feb. 13, 14. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 21 147 20 11 8.6 17 12 12 15 10 13 18 2 25 126 61 16 8.1 14 11 11 15 10 16 15 3 28 648 26 12 8.0 16 11 11 14 10 13 13 4 22 227 21 25 7.7 13 9.5 11 14 10 12 12 5 49 463 20 13 7.8 12 9.5 12 14 9.1 11 12 6 29 449 19 15 7.8 21 9.6 11 13 8.9 12 11 7 34 212 18 12 8.0 53 9.5 11 13 8.6 12 10 8 26 105 18 11 8.0 32 8.8 11 13 8.6 12 22 9 245 82 19 10 7.8 20 8.3 11 13 8.6 11 15 10 71 66 17 11 7.8 16 8.0 11 13 8.1 11 12 11 35 55 17 11 7.8 15 8.3 16 12 8.6 10 13 12 27 47 17 9.8 7.8 15 8.7 17 12 8.1 10 170 13 50 44 16 9.3 8.3 14 11 14 13 7.9 22 158 14 114 60 15 9.3 8.5 14 8.2 156 12 8.5 15 72 15 50 46 15 9.2 11 13 8.2 282 12 51 14 38 16 35 37 16 9.0 9.4 13 15 95 11 136 11 25 17 28 34 15 8.9 8.3 13 27 205 10 261 10 21 18 26 31 14 8.7 8.4 76 24 1110 9.8 26 12 19 19 25 30 14 8.6 11 19 13 84 10 17 11 18 20 23 28 14 8.4 12 16 11 54 9.5 27 10 17 21 23 28 12 8.3 9.7 15 23 39 9.3 25 11 16 22 22 28 12 8.3 9.0 14 43 31 9.3 16 10 16 23 21 32 12 7.8 8.1 14 264 27 9.3 16 9.4 15 24 20 29 14 7.8 8.4 13 111 25 9.2 48 9.9 61 25 40 52 18 7.9 7.9 12 53 26 9.8 29 10 263 26 72 46 13 9.4 12 12 25 22 9.5 47 9.9 75 27 32 25 14 8.4 80 13 18 19 9.5 20 146 32 28 32 23 13 8.2 21 12 16 18 8.7 33 98 67 29 29 22 12 7.5 --- 122 14 18 8.6 22 23 31 30 23 21 15 7.8 22 13 17 8.6 17 17 28 31 21 --- 12 7.8 21 --- 16 --- 15 15 --- TOTAL 1298 3243 538 317.4 328.2 692 811.6 2403 340.1 931.0 607.2 1295 MEAN 41.9 108 17.4 10.2 11.7 22.3 27.1 77.5 11.3 30.0 19.6 43.2 MAX 245 648 61 25 80 122 264 1110 15 261 146 263 MIN 20 21 12 7.5 7.7 12 8.0 11 8.6 7.9 9.4 10 CFSM 6.98 18.0 2.90 1.70 1.95 3.72 4.52 12.9 1.88 5.00 3.27 7.20 IN. 8.05 20.11 3.34 1.97 2.03 4.29 5.03 14.90 2.11 5.77 3.76 8.03 AC-FT 2570 6430 1070 630 651 1370 1610 4770 675 1850 1200 2570 CAL YR 1984 TOTAL 11512.0 MEAN 31.5 MAX 648 MIN 4.6 CFSM 5.25 IN. 71.37 AC-FT 22830 WTR YR 1985 TOTAL 12804.5 MEAN 35.1 MAX 1110 MIN 7.5 CFSM 5.85 IN. 79.39 AC-FT 25400 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 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TUBE DATE TIME INSTANTANEOUS DUCTANCE TURF (CFS) (UMBOS) (DEG C) (CFS) (UMHOS) (DEG C) JAN, 17 1359 FRB, 19 1430 8.6 14 146 141 23.0 25.0 APR, 08 1413 SEP, 05 0942 8.8 12 160 149 28.5 26.0 MAR, 07 1166 33 139 22.5 149 I I RIO GRANDE DE LOIZA BASIN 150 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 sq mi (8.42 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 459 ft (140 ), fro topographic map. REMARKS.--Estimated daily discharges: Oct. 1-24 and Nov. 4, 7-9. Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 cu ft/s (28.3 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Nov. 3 0515 1,580 44.7 9.10 2.774 Sept. 12 1845 1,430 40.5 8.90 2.713 May 17 1115 *7,400 210 *14.58 4.444 Sept. 25 0115 1,080 30.6 8.37 2.551 May 18 0600 2,190 62.0 9.86 3.005 Minimum discharge, 0.46 cu ft/s (0.013 cu m/s), May 8. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 9.0 26 2.4 5.9 1.1 1.7 1.5 .79 3.9 1.8 1.6 3.0 2 8.0 69 15 4.7 1.0 1.5 1.6 .69 3.6 1.7 1.7 9.8 3 16 265 4.1 2.5 .96 1.6 1.7 .67 4.1 1.8 1.7 3.8 4 7.4 82 2.8 2.3 .92 1.6 1.7 .61 9.6 1.9 1.5 2.6 5 10 169 2.4 1.8 .92 2.1 1.6 .60 5.4 1.6 1.5 2.2 6 7.0 160 2.3 1.8 .90 3.3 1.6 .58 3.1 1.4 1.6 2.1 7 8.0 105 2.5 1.7 .85 5.2 1.5 .55 3.0 1.4 1.6 1.9 8 6.0 55 3.5 1.5 .89 2.3 1.2 .51 3.0 1.4 1.5 8.0 9 55 35 3.9 1.4 .99 1.6 1.0 .63 2.8 1.3 1.5 4.5 10 10 21 4.1 1.6 1.1 1.2 .91 .53 2.8 1.2 1.5 2.7 11 8.0 11 14 1.7 1.2 1.1 .86 .56 2.9 1.4 1.5 2.8 12 7.0 8.2 4.5 1.8 1.3 1.0 .81 1.5 2.8 1.3 1.6 97 13 22 7.2 3.1 2.2 1.5 .94 .94 1.6 2.5 1.3 3.0 69 14 95 14 2.6 2.5 1.8 .87 .81 12 2.4 1.2 1.9 25 15 8.1 13 2.4 2.8 2.0 .81 .83 111 2.3 7.4 1.7 14 16 20 8.0 2.2 2.4 1.9 .78 .98 16 2.1 5.9 1.5 7.5 17 14 7.0 2.0 2.2 1.7 .79 .87 308 2.0 7.5 1.4 5.8 18 5.0 6.1 1.6 1.8 1.6 2.5 1.0 382 2.0 2.4 1.5 4.6 19 4.5 5.6 1.7 1.6 1.7 1.1 .94 40 2.0 2.3 1.4 4.1 20 4.3 5.0 1.6 1.4 1.5 .86 .68 19 2.2 12 1.4 3.6 21 4.2 4.5 1.6 1.2 1.1 .84 .82 12 2.2 4.0 1.5 3.4 22 4.5 4.3 1.5 1.0 .94 .83 .73 12 2.0 2.4 1.4 3.2 23 5.0 4.5 1.4 1.1 1.0 .81 48 11 2.0 2.3 1.4 3.4 24 4.4 3.8 1.9 1.1 1.1 .80 11 9.0 2.0 3.0 1.3 16 25 9.0 3.7 3.4 .89 1.1 .77 35 6.3 1.8 2.2 1.4 87 26 5.9 4.4 2.6 1.0 1.2 .78 4.4 5.6 1.8 2.7 1.5 14 27 5.5 3.1 2.9 .96 2.4 .80 1.5 5.1 1.7 2.0 16 7.7 28 5.9 2.8 3.1 1.0 2.2 .76 1.0 4.9 1.7 2.9 4.3 9.9 29 5.6 2.6 2.0 .97 --- 33 .97 4.6 1.7 2.3 2.6 6.3 30 8.2 2.5 2.4 .99 2.5 .89 4.3 1.6 1.9 2.1 5.4 31 6.4 --- 1.9 1.0 2.1 --- 4.1 --- 1.7 2.4 --- TOTAL 388.9 1108.3 103.4 56.81 36.87 76.84 127.34 976.72 83.0 85.6 68.5 430.3 MEAN 12.5 36.9 3.34 1.83 1.32 2.48 4.24 31.5 2.77 2.76 2.21 14.3 MAX 95 265 15 5.9 2.4 33 48 382 9.6 12 16 97 MIN 4.2 2.5 1.4 .89 .85 .76 .68 .51 1.6 1.2 1.3 1.9 CFSM 3.85 11.4 1.03 .56 .41 .76 1.30 9.69 .85 .85 .68 4.40 IN. 4.45 12.69 1.18 .65 .42 .88 1.46 11.18 .95 .98 .78 4.93 AC-FT 771 2200 205 113 73 152 253 1940 165 170 136 854 WTR YR 1985 TOTAL 3542.58 MEAN 9.71 MAX 382 MIN .51 CFSM 2.99 IN. 40.55 AC-FT 7030 RIO GRANDE DE LOIZA BASIN 151 50051150 QUEBRADA BLANCA AT EL JAGUAL, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--JANUARY 1985 TO SEPTEMBER 1985 WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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) JAN, 15 1403 2.7 264 25.5 MAR, 06 1055 2.0 326 24.0 FEB, 14 1115 1.7 323 23.0 APR, 03 1151 1.9 299 27.5 152 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 sq mi (9.69 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 330 ft (100 m), from topographic map. REMARKS.--Estimated daily discharges: Oct. 31 to Nov. 5. Records fair except those for estimated daily dicharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,320 cu ft/s (264 cu m/s), May 17, 1985, gage height, 17.10 ft (5.212 m), from floodmark, from rating curve extended above 200 cu ft/s (5.66 cu m/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 0.69 cu ft/s (0.020 cu m/s), Apr. 9-13, 15, 16, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 cu ft/s (28.3 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) May 17 1130 *9,320 264 *17.10 5.212 May 18 08001,660 47.0 9.79 2.984 Minimum discharge, 0.82 Cu ft/s (0.023 cu m/s), July 14, 15. REVISIONS.--The maximum discharge for 1984 water year has been revised to 8,000 cu ft/s, June 10, 1984, gage height, 15.12 ft. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 3.5 3.0 4.3 3.9 3.1 6.2 12 60 20 246 3.0 28 7.0 4.3 3.7 6.7 5.4 3.3 3.6 3.4 1.6 1.5 1.5 1.4 1.4 1.8 1.5 1.4 1.4 1.8 3.1 2.1 1.7 1.5 1.4 1.4 1.3 1.3 1.2 1.3 2.7 2.7 2.7 2.7 2.6 1.3 1.2 1.4 1.4 1.2 1.4 1.9 1.4 1.4 1.3 2.7 6.2 4.0 2.5 2.2 6 7 8 9 10 3.5 2.7 2.7 28 7.9 158 102 46 26 18 3.4 3.2 14 4.4 3.5 3.3 2.7 2.5 2.3 2.4 1.4 1.4 1.4 1.3 1.2 2.2 3.9 2.4 1.8 1.6 1.4 1.8 1.4 1.2 1.1 1.2 1.1 1.1 1.3 1.2 2.6 2.6 2.7 2.6 2.6 1.1 .99 1.0 .99 .93 1.3 1.3 1.3 1.3 1.2 2.6 2.1 8.1 6.3 3.1 11 12 13 14 15 4.3 3.4 22 98 12 6.1 4.1 3.1 7:3 12 22 4.2 3.3 3.3 3.1 2.2 2.1 2.0 2.0 2.1 1.3 1.3 1.2 1.4 1.4 1.5 1.6 1.6 1.5 1.5 1.2 1.2 1.3 1.2 1.3 1.4 2.1 1.5 15 172 2.5 2.4 2.1 2.0 2.0 1.1 1.1 .93 .89 6.5 1.1 1.2 2.8 1.6 1.5 2.8 82 91 23 12 16 17 18 19 20 7.3 7.0 4.5 3.3 3.2 4.1 3.4 3.2 2.9 2.6 3.3 2.9 2.5 2.7 2.7 2.0 2.0 2.0 2.0 1.8 1.4 1.4 1.3 1.5 1.8 1.5 1.5 2.7 1.7 1.5 1.9 1.4 1.4 1.8 1.2 62 400 356 29 9 6 2.0 1.9 1.9 1.8 1.9 9.6 7.1 2.0 1.4 6.8 1.3 1.3 1.3 1.3 1.2 7.2 5.5 4.7 4.2 3.9 21 22 23 24 25 3.1 3.2 2.4 2.1 7.2 2.5 2.7 4.0 2.8 2.9 2.5 2.4 2.4 3.0 4.7 1.7 1.7 1.7 1.7 1.7 1.6 1.5 1.5 1.6 1.7 1.5 1.4 1.4 1.4 1.4 1.4 1.2 78 33 36 7.9 6.3 4.9 4.5 4.4 1.9 1.7 1.7 1.6 1.4 2.4 1.6 1.5 2.2 1.6 1.2 1.2 1.1 1.1 1.2 3.7 3.5 3.8 11 87 26 27 28 29 30 31 2.5 2.1 2.0 1.9 14 2.2 5.6 3.2 3.0 3.0 3.0 --- 4.2 4.0 3.7 2.8 3.5 3.0 1.8 1.7 1.7 1.6 1.6 1.5 1.7 2.8 2.7 --- 1.4 1.5 1.5 83 13 12 9.1 3.3 2.1 1.7 1.6 --- 4.1 3.9 3.3 3.1 2.9 2.7 1.6 1.4 1.4 1.4 1.3 --- 2.3 1.6 2.8 2.0 1.7 1.4 1.4 13 5.3 2.6 2.0 2.0 10 5.9 9.8 6.1 4.8 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 270.3 8.72 98 1.9 2.33 2.69 536 775.7 25.9 246 2.5 6.93 7.72 1540 160.7 5.18 28 2.4 1.39 1.60 319 74.2 2.39 6.7 1.5 .64 .74 147 43.2 1.54 2.8 1.2 .41 .43 86 155.9 5.03 83 1.4 1.34 1.55 309 198.0 6.60 78 1.1 1.76 1.97 393 1109.0 35.8 400 1.1 9.57 11.03 2200 62.4 2.08 2.7 1.3 .56 .62 124 70.03 2.26 9.6 .89 .60 .70 139 60.5 1.95 13 1.1 .52 .60 120 421.7 14.1 91 2.1 3.77 4.19 836 CAL YR 1984 WTR YR 1985 TOTAL TOTAL 2866.79 3401.63 MEAN MEAN 7.83 9.32 MAX MAX 295 400 MIN MIN .71 .89 CFSM CFSM 2.09 2.49 IN. IN. 28.51 33.83 AC-FT AC-FT 5690 6750 RIO GRANDE DE LOIZA BASIN 153 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 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMEOS) (DEG C) (CFS) (UMHOS) (DEG C) JAN, 15 1158 2.2 392 22.0 MAR, 06 0935 1.7 452 22.5 FEB, 14 0937 1.2 467 21.0 APR, 09 1021 1.3 421 26.0 I I I I I I I I I RIO GRANDE DE LOIZA BASIN 154 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 mi (4.5 km) south of San Lorenzo. DRAINAGE AREA.--10.2 sq mi (26.4 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1977 to current year. GAGE.--Water-stage recorder. Elevation of gage is 490 ft (150 ), fro topographic map. Prior to Oct. 1, 1983, at site 2,000 ft (610 ) downstream at different datum. REMARKS.--No estimated daily discharges during water year. Records fair. AVERAGE DISCHARGE.--8 years (1978-85), 49.3 cu ft/s (1.396 cu /s), 65.64 in/yr (1,667 mm/yr), 35,720 acre-ft/yr (44.0 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,200 cu ft/s (374 cu /a), Aug. 31, 1979, gage height, 9.44 ft (2.877 ), site and datum then in use, fro rating curve extended above 1,000 cu ft/s (28.3 cu /a) on the basis of slope-area measurement; minimum discharge, 7.1 cu ft/s (0.201 cu m/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 cu ft/s (70.8 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu /a) (ft) (m) Nov. 3 1115 2,980 84.4 13.89 4.234 May 18 0630 *8,180 232 *19.71 6.008 May 15 1415 3,460 96.0 14.60 4.450 Sept. 12 1900 2,630 74.5 13.33 4.063 Minimum discharge, 13 cu ft/s (0.368 cu m/s), Mar. 5. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 33 33 39 33 32 142 243 1010 248 650 36 74 45 37 39 29 33 29 42 28 20 19 17 16 16 21 19 26 18 15 23 19 19 18 19 17 18 20 19 20 44 42 41 39 38 26 28 28 28 25 24 24 22 20 17 27 26 23 22 23 6 7 8 9 10 36 45 51 272 90 694 355 123 84 74 37 37 37 44 38 29 26 26 25 26 16 15 16 15 15 18 48 42 25 22 19 20 21 18 18 20 21 21 24 23 37 35 35 34 34 23 23 22 23 23 21 22 22 20 24 25 25 39 40 30 11 12 13 14 15 53 40 63 350 71 62 55 52 74 62 47 39 36 35 34 26 26 26 25 25 15 16 18 18 23 20 20 19 22 19 20 19 26 21 20 31 40 32 199 958 34 32 30 29 28 24 23 22 22 66 21 23 32 29 28 35 393 286 72 42 16 17 18 19 20 69 76 43 41 40 47 46 44 43 42 38 39 33 34 34 25 27 27 26 25 20 17 19 30 30 19 20 46 22 19 36 28 36 26 23 240 396 1890 134 83 26 25 24 24 25 90 212 38 25 62 26 23 23 22 24 31 28 25 27 26 21 22 23 24 25 40 41 38 37 56 41 43 45 40 42 32 31 30 35 44 25 26 25 24 22 22 22 20 21 20 21 19 19 21 16 29 40 464 191 95 64 60 59 57 57 25 24 25 26 26 27 22 21 32 26 23 21 22 25 31 25 24 24 35 390 26 27 28 29 30 31 114 65 52 51 47 41 68 39 38 37 37 --- 34 34 32 30 34 29 22 20 20 19 19 19 21 68 28 --- 18 22 19 332 44 39 41 23 20 19 18 --- 55 52 50 49 47 46 27 24 24 24 23 --- 47 28 29 29 27 26 26 139 143 28 23 22 64 40 73 41 40 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 2092 67.5 350 32 6.62 7.63 4150 4580 153 1010 37 15.0 16.70 9080 1158 37.4 74 29 3.67 4.22 2300 792 25.5 42 19 2.50 2.89 1570 593 21.2 68 15 2.08 2.16 1180 1050 33.9 332 15 3.32 3.83 2080 1379 46.0 454 18 4.51 5.03 2740 4801 155 1890 17 15.2 17.51 9520 904 30.1 44 23 2.95 3.30 1790 1147 37.0 212 21 3.63 4.18 2280 970 31.3 143 17 3.07 3.54 1920 2001 66.7 393 22 6.54 7.30 3970 CAL YR 1984 WTR YR 1985 TOTAL TOTAL 17944 21467 MEAN MEAN 49.0 58.8 MAX MAX 1010 1890 MIN MIN 11 15 CFSM CFSM 4.80 5.76 IN. IN. 65.44 78.29 AC-FT AC-FT 35590 42580 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 1984 TO SEPTEMBER 1985 DATE TIME I STREAMFLOW, NSTANTANEOUS SPECIFIC CON- DUCTANCE TEMPERA- TUBE DATE TIME I STREAMFLOW, NSTANTANEOUS SPECIFIC CON- DUCTANCE TEMPERA- TURE (CFS) (MOOS) (DEG C) (CFS) (UMHOS) (DEG C) JAN, 17 1025 FEB, 19 1140 MAR, 07 0954 24 22 45 129 146 127 20.6 24.0 22.0 APR, 08 1056 SEP, 06 1223 23 21 146 134.4 25.0 29.0 155 I I I 156 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 km) south of Villa Borinquen, and 7.3 mi (11.7 km) upstream from Rio Grande de Loiza. DRAINAGE AREA.--7.89 sq mi (20.44 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--December 1983 to current year. GAGE.--Water-stage recorder. Elevation of gage is 430 ft (131 m), fro topographic map. REMARKS.--Estimated daily discharges: Nov. 9-15, April 13-15, and May 17-20. Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 11,600 cu ft/s (328 cu m/s), May 18, 1985, gage height, 17.06 ft (5.200 a), fro floodmark, fro rating curve extended above 200 cu ft/s (5.66 cu m/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 4.0 cu ft/s (0.113 cu m/s), May 6, 1985, gage height, 3.75 ft (1.143 a). EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 1,500 cu ft/s (42.5 cu m/s) and maximum (*) Discharge Gage height Discharge Gage height Date Time (cu ft/a) (cu m/s) (ft) (a) Date Time (cu ft/s) (cu m/s) (ft) (m) Nov. 3 0530 4,990 141 12.25 3.734 May 17 1215 8,950 253 15.74 4.798 Apr. 23 1745 1,710 48.4 8.53 2.600 May 18 Unknown *11,600 328 *17.06 5.200 Minimum discharge, 4.0 cu ft/s (0.113 cu m/s), May 6. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 14 62 14 17 10 20 14 6.0 11 13 12 12 2 13 123 54 17 9.6 18 12 5.7 11 12 12 12 3 14 611 27 13 9.4 19 11 5.6 11 12 11 12 4 12 182 19 18 9.7 17 11 5.2 11 12 11 11 5 12 335 18 12 9.1 18 11 5.3 10 11 11 15 6 13 279 16 17 8.9 29 11 5.1 10 10 11 13 7 12 196 16 12 7.6 38 12 5.3 9.7 9.2 10 11 8 12 114 20 11 7.6 30 12 4.8 9.8 9.3 10 18 9 51 80 19 11 7.7 22 9.3 5.3 9.2 9.3 9.5 18 10 16 64 19 12 8.0 18 8.2 4.8 10 9.3 9.3 14 11 13 54 17 10 8.7 16 8.7 5.5 11 10 10 12 12 12 46 16 9.4 8.9 17 8.3 8.2 12 9.7 12 49 13 12 43 15 9.3 8.6 15 11 6.8 14 9.1 17 53 14 26 51 15 9.9 10 14 9.0 202 13 9.3 14 22 15 14 34 16 11 9.6 13 8.0 205 13 19 13 17 16 18 28 22 11 9.0 13 14 146 12 18 12 14 17 18 24 14 11 8.6 13 12 1300 11 29 12 12 18 14 22 12 11 8.4 55 15 900 11 13 13 11 19 13 21 12 10 22 23 11 50 11 12 12 11 20 13 19 11 10 20 17 9.1 16 12 11 11 9.7 21 15 18 9.0 9.7 17 16 18 10 11 9.7 12 9.7 22 16 17 8.5 9.7 14 15 10 9.4 12 11 13 9.7 23 15 18 8.4 9.4 13 15 228 9.1 12 12 12 10 24 13 16 9.7 9.5 15 13 52 9.0 12 13 12 16 25 23 16 21 9.7 15 13 109 9.9 12 11 14 31 26 19 31 12 10 16 12 31 10 11 14 13 14 27 16 19 12 9.2 42 12 11 11 11 12 30 12 28 19 15 11 9.3 25 12 8.6 11 11 13 23 12 29 14 15 9.2 8.9 --- 67 7.2 11 12 14 14 11 30 58 15 12 8.9 24 6.4 11 11 13 13 10 31 17 --- 10 9.2 24 --- 11 --- 12 13 --- TOTAL 547 2568 494.8 346.1 358.4 648 698.8 3005.0 337.7 381.9 401.8 482.1 MEAN 17.6 85.6 16.0 11.2 12.8 20.9 23.3 96.9 11.3 12.3 13.0 16.1 MAX 58 611 54 18 42 67 228 1300 14 29 30 53 MIN 12 15 8.4 8.9 7.6 12 6.4 4.8 9.2 9.1 9.3 9.7 CFSM 2.23 10.8 2.03 1.42 1.62 2.65 2.95 12.3 1.43 1.56 1.65 2.04 IN. 2.58 12.11 2.33 1.63 1.69 3.06 3.29 14.17 1.59 1.80 1.89 2.27 AC-FT 1080 5090 981 686 711 1290 1390 5960 670 757 797 956 CAL YR 1984 TOTAL 10190.6 MEAN 27.8 MAX 611 MIN 6.3 CFSM 3.52 IN. 48.05 AC-FT 20210 WTR YR 1985 TOTAL 10269.6 MEAN 28.1 MAX 1300 MIN 4.8 CFSM 3.56 IN. 48.42 AC-FT 20370 RIO GRANDE DE LOIZA BASIN 157 50063050 RIO TURABO AT BORINQUEN, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--JANUARY TO SEPTEMBER 1985 WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TUBE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) JAN, 16 1250 11 163 24.0 APR, 03 0919 11 182 23.0 FEB, 14 1516 13 180 24.5 SEP, 06 1242 13 152.5 29.5 MAR, 06 1356 56 158 23.0 RIO GRANDE DE LOIZA BASIN 158 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 (76 a) upstream from bridge on Highway 189, 1.2 mi (1.9 km) downstream from Rio Turabo, and 1.8 mi (2.9 km) east of Plaza de Caguas. DRAINAGE AREA.--89.8 aq mi (232.6 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1959 (low-flow measurement only), February to November 1959 (monthly measurements only), December 1959 to current year. GAGE.--Water-stage recorder. Elevation of gage is 143.28 ft (43.672 a) above mean sea level. REMARKS.--No estimated daily discharges during water year. Records fair. AVERAGE DISCHARGES.--25 years (1961-85), 221 ou ft/a (6.259 cu m/s), 33.42 in/yr (849 ma/yr), 160,100 acre-ft/yr (197 cu hm/yr); median of yearly mean discharges, 210 ou ft/s (6.95 ou m/s), 162,000 acre-ft/yr (190 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 71,500 cu ft/s (2,020 cu m/s), Sept. 6, 1960, gage height, 31.17 ft (9.501 a), from rating curve extended above 6,000 cu ft/a (170 ou m/s) on basis of slope-area measurement; minimum daily discharge, 10 ou ft/s (0.283 cu m/s), Apr. 5, 10, 29, 1968. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 8,000 cu ft/s (227 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (a) Date Time (cu ft/s) (cu a/s) (ft) (a) Nov. 3 0715 16,400 464 17.52 5.340 May 17 1230 24,800 702 20.43 6.227 Nov. 5 1345 10,500 297 15.01 4.575 May 18 0845 *28,000 793 *21.40 6.523 Apr. 23 1800 8,540 242 14.04 4.279 Sept. 12 2015 9,380 266 14.47 4.410 May 15 1530 11,900 337 15.66 4.773 Minimum discharge, 16 cu ft/s (0.453 cu m/s), July 10. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 152 132 155 155 143 456 1180 5950 1960 4120 166 423 287 193 176 129 224 146 174 143 68 71 65 59 59 100 75 77 68 66 127 93 83 76 74 132 124 124 126 123 155 147 142 136 131 56 80 72 84 62 90 108 94 82 74 122 125 125 81 119 6 7 8 9 10 207 145 151 930 392 3790 2700 1150 890 621 168 159 165 209 189 141 128 115 110 113 67 55 56 55 54 91 208 220 107 81 76 83 81 70 63 121 117 118 119 132 127 125 127 124 120 49 43 39 39 26 73 87 75 72 63 99 64 147 235 92 11 12 13 14 15 243 179 265 1180 331 434 363 320 434 483 334 225 167 144 141 109 101 97 92 94 55 56 54 62 76 68 65 69 61 58 67 72 79 76 68 142 178 189 1070 3280 111 114 97 92 88 37 30 30 23 270 59 55 167 130 99 85 1270 707 492 16 17 18 19 20 254 335 195 169 161 308 290 267 241 226 158 165 140 136 146 87 86 84 88 82 75 60 57 73 107 58 58 219 105 69 111 103 150 109 84 1500 5620 10400 3170 518 87 84 83 78 75 531 787 224 139 375 75 62 62 69 54 318 264 237 220 209 21 22 23 24 25 184 177 143 129 221 214 211 237 214 195 126 121 118 137 183 80 75 76 77 73 75 66 62 66 66 60 59 57 54 51 119 131 1680 1100 864 374 303 262 237 225 76 71 70 69 67 189 135 117 180 155 63 61 51 48 56 197 188 193 312 1650 26 27 28 29 30 31 236 221 217 193 473 220 327 200 187 180 172 --- 167 159 162 132 152 144 85 80 74 69 66 65 68 229 166 --- 51 53 60 1410 236 315 433 238 184 155 144 --- 207 192 184 173 163 157 66 63 56 57 52 --- 217 141 147 153 116 97 79 502 525 167 112 98 465 368 392 305 261 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 8288 267 1180 129 2.97 3.43 16440 28320 944 5950 172 10.5 11.73 56170 5491 177 423 118 1.97 2.27 10890 3163 102 224 65 1.14 1.31 6270 2072 74.0 229 54 .82 .86 4110 4329 140 1410 51 1.56 1.79 8590 6793 226 1680 63 2.52 2.81 13470 29780 961 10400 117 10.7 12.34 59070 2890 96.3 155 62 1.07 1.20 5730 4643 150 787 23 1.67 1.92 9210 3412 110 525 48 1.22 1.41 6770 11312 377 1970 64 4.20 4.69 22440 CAL YR 1984 WTR YR 1985 TOTAL TOTAL 88768 110493 MEAN MEAN 243 303 MAX MAX 5950 10400 MIN MIN 30 23 CFSM CFSM 2.71 3.37 IN. IN. 36.77 45.77 AC-FT AC-FT 176100 219200 RIO GRANDE DE LOIZA BASIN 159 60055000 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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIE- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIE- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 05... 1530 8100 87 6.60 24.0 140 8.5 101 29 5400 K60 JAN 1985 14... 1245 92 272 7.50 23.0 9.0 9.0 104 <10 K25000 160 MAR 27... 1355 52 271 7.40 24.5 8.5 7.2 86 12 35000 220 JUN 10... 1415 124 252 7.80 29.5 2.6 8.8 114 10 3400 K60 AUG 08... 1106 72 248 7.60 30.0 14 7.7 101 10 5400 K60 ALKA- MAGEE- SODIUM POTAS- LINITY CHLO- HARD- CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS DIS- DIS- DIE- SORP- DIE- TOTAL SULFIDE DIE- DIS- (MG/L SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) AS CA) AS MG) AS NA) AS K) CAC03 AS 3) AS SO4) AS CL) NOV 1984 05... 15 3.6 1.5 6.0 0.7 1.5 16 5.9 5.0 JAN 1985 14... 80 20 7.2 23 1 1.3 83 <0.5 16 18 MAR 27... 82 JUN 10... 71 18 6.3 20 1 1.8 76 <0.5 15 19 AUG 08... ...... 74 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 DIE- (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) (MO/L) AS N) AS N) AS N) AS N) AS N) NOV 1984 05... <0.1 10 43 942 2090 0.25 0.05 0.30 0.18 7.2 JAN 1985 14... 0.2 29 160 41 18 0.54 0.06 0.60 0.28 0.82 MAR 27... 16 0.51 0.09 0.60 0.31 0.29 JUN 10... 0.2 30 160 52 21 0.36 0.04 0.40 0.10 0.3 AUG 08... 19 0.51 0.09 0.60 0.20 0.6 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 1984 05... 7.4 7.7 34 0.16 -- JAN 1985 14... 1.1 1.7 7.5 0.29 1 <100 <20 <1 <1 <10 MAR 27... 0.6 1.2 5.3 0.17 JUN 10... 0.4 0.8 3.5 0.09 <1 <100 120 <1 4 <10 AUG 08... 0.8 1.4 6.2 0.18 K = non-ideal count 160 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 (UO/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 1984 05... JAN 1985 14... 1100 <1 200 30 <0.01 4 MAR 27... (0.1 JUN 10... 660 1 150 0.1 <1 <1 10 <0.01 <1 0.02 AUG 08... RIO GRANDE DE LOIZA BASIN 161 50055250 RIO CAGU1TAS 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 ka) east of Caguas plaza. DRAINAGE AREA.--14.1 sq si (36.5 sq ka). PERIOD OF RECORD.--Water years 1972 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 13... 1335 49 428 7.60 25.0 6.4 6.6 79 13 460000 JAN 1985 22... 1305 13 566 7.60 24.5 4.9 58 52 270000 21000 APR 23... 1250 38 270 7.20 26.0 15 4.4 54 39 350000 400000 JUN 13... 1525 25 623 7.50 30.5 3.0 8.4 110 51 54000 12000 AUG 08... 1410 22 619 7.40 30.5 6.0 4.0 53 52 20000 1000 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 3) AS SO4) AS CL) NOV 1984 13... 160 31 40 14 25 0.9 2.7 127 40 32 JAN 1985 22... 190 36 50 16 32 1 2.8 161 <0.5 59 38 APR 23... 66 JUN 13... 150 38 13 51 2 7.2 157 <0.5 54 50 AUG 08... 153 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 1984 13... 0.1 29 260 34 12 1.23 0.07 1.30 0.52 0.68 JAN 1985 22... 0.3 32 320 11 12 0.80 0.10 0.90 1.50 0.9 APR 23... 399 0.33 0.07 0.40 1.50 18 JUN 13... 0.6 30 340 23 12 0.45 0.15 0.60 9.30 2.7 AUG 08... 19 0.74 0.16 0.90 8.50 1.5 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) NOV 1984 13... 1.2 2.5 11 0.09 JAN 1985 22... 2.4 3.3 15 0.66 2 <100 50 1 <1 <10 APR 23... 20 20 90 0.44 JUN 13... 12 13 56 3.40 1 <100 80 6 31 <10 AUG 08... 10 11 48 <0.01 RIO GRANDE DE LOIZA BASIN 162 50055250 RIO CAGUITAS AT HIGHWAY 30 AT CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE SUABLE 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 1984 13... JAN 1985 22... 1100 4 240 0.2 <1 2 50 <0.01 9 0.07 APR 23... 0.2 13... 660 <1 180 0.4 <1 2 250 0.63 7 1.1 AUG 08... RIO GRANDE DE LOIZA BASIN 163 50055400 RIO BAIROA NEAR CAGUAS, PR WATER-QUALITY RECORDS SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 25... 1300 7.8 538 7.40 27.0 6.2 78 81 2000000 K130000 JAN 1985 22... 1000 4.1 444 7.70 19.5 1.5 8.5 92 32 K6400 990 APR 19... 1140 3.0 481 7.60 25.5 2.5 7.5 91 10 6000 K1000 JUN 13... 1245 3.0 419 7.80 27.5 1.5 9.3 116 10 440 K500 JUL 29... 1610 4.9 512 7.30 28.5 22 2.2 28 110 K2800000 280000 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 CACO3) CACO3 AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS SO4) AS CL) OCT 1984 25... 150 6 36 15 37 1 6.3 146 28 48 JAN 1985 22... 160 15 38 16 28 1 4.0 146 <0.5 18 42 APR 19... 140 JUN 13... 150 14 36 14 26 1 4.2 134 <0.5 18 41 JUL 29... 151 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 1984 25... 0.2 28 290 6.0 6 1.50 0.10 1.60 2.20 3.6 JAN 1985 22... 0.3 33 270 3.0 4 2.17 0.03 2.20 0.12 0.78 APR 19... 8 1.54 0.06 1.60 0.14 0.26 JUN 13... 0.3 29 250 2.0 4 1.28 0.02 1.30 0.08 0.92 JUL 29... 20 0.89 0.11 1.00 3.20 3.3 K = non-ideal count RIO GRANDE DE LOIZA BASIN 164 50055400 RIO BAIROA NEAR CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1984 25... 5.8 7.4 33 2.20 JAN 1985 22... 0.9 3.1 14 0.69 3 100 30 1 <1 <10 APR 19... 0.4 2.0 8.9 0.65 JUN 13... 1.0 2.3 10 0.51 3 100 30 <1 3 <10 JUL 29... 6.5 7.5 33 <0.01 -- 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 1984 14... 25... JAN 1985 22... 380 <1 150 <0.1 <1 <1 30 <0.01 8 0.05 APR 19... <0.1 JUN 13... 400 4 100 0.1 <1 <1 20 <0.01 2 0.05 JUL 29... I I I I I I I I I I RIO GRANDE DE LOIZA BASIN 165 50055650 QUEBRADA CAIMITO NEAR JUNCOS, PR LOCATION.--Lat 18014'08", long 65°52'12", Hydrologic Unit 21010005, at upstream aide of bridge on Highway 31, 0.5 i (0.8 km) upstream fro Rio Gurabo, and 3.5 i (5.6 km) east of Juncos. DRAINAGE AREA.--0.82 sq mi (2.12 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 310 ft (95 ), fro topographic map. REMARKS.--No estimated daily discharges during water year. Records poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 678 cu ft/s (19.2 tau m/s), May 18, 1985, gage height, 12.07 ft (3.679 a), from floodmark, from rating curve extended above 100 cu ft/a (2.83 ou /s) on basis of step-backwater analysis; minimum discharge, no flow many days in each year. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 150 ou ft/s (4.25 ou /s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu /s) (ft) (a) Date Time (cu ft/s) (cu /s) (ft) (a) Oct. 14 0515 228 6.46 9.79 2.984 May 17 2145 200 5.66 9.60 2.926 Nov. 6 0415 178 5.04 9.48 2.890 May 18 0530 *678 19.2 *12.07 3.679 May 15 1415 344 9.74 10.48 3.194 No flow any days. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .33 .48 .43 .56 .10 .15 .14 .06 .25 .00 .01 .00 2 .50 1.0 1.4 2.1 .07 .04 .10 .12 .22 .00 1.9 .00 3 1.1 12 .54 .00 .05 .00 .06 .10 .20 .00 1.8 .00 4 .51 12 .42 .05 .04 .00 .03 .08 .19 .00 .00 .00 5 .44 31 .38 .04 .02 .07 .00 .07 .17 .00 .00 .00 6 .45 68 .33 .04 .01 .05 .00 .07 .15 .00 .00 .00 7 .33 41 .33 .07 .00 .14 .01 .05 .13 .00 .00 .00 8 .29 17 .33 .09 .00 .21 .00 .04 .12 .00 .00 .00 9 1.8 12 .34 .11 .00 .16 .01 .03 .11 .00 .00 .86 10 1.6 6.3 .33 .16 .00 .06 .00 .02 .09 .00 .00 1.3 11 1.2 3.4 .31 .23 .00 .00 .00 .02 .08 .00 .00 1.1 12 .86 1.8 .29 .23 .00 .00 .00 .08 .05 .00 .00 4.2 13 .64 1.1 .25 .21 .00 .00 .01 .04 .03 .00 .00 18 14 16 2.6 .23 .21 .00 .00 .00 .64 .00 .00 .00 5.8 15 2.8 2.8 .24 .20 .00 .00 .01 57 .00 .28 .00 2.4 16 1.1 1.7 .33 .20 .00 .00 .20 15 .00 1.2 .00 1.3 17 .80 1.7 .46 .20 .00 .00 .12 28 .00 1.4 .00 .70 18 .64 1.2 .28 .20 .01 .03 .06 129 .00 .24 .00 .39 19 .50 1.0 .27 .17 .00 .00 .02 16 .00 .04 .00 .27 20 .46 .91 .25 .16 .00 .00 .00 4.7 .00 2.7 .00 .19 21 .45 .79 .23 .14 .00 .00 .00 2.0 .00 .87 .00 .15 22 .37 .71 .24 .14 .00 .00 .00 1.1 .00 .32 .00 .10 23 .32 .77 .24 .13 .00 .00 5.2 .74 .00 .27 .00 .29 24 .26 .72 .30 .13 .00 .00 .98 .57 .00 .29 .00 .75 25 .53 .70 .34 .13 .00 .00 .32 .48 .00 .18 .00 6.1 26 .33 .62 .29 .14 .00 .00 .19 .42 .00 .11 .00 1.9 27 .28 .52 .38 .12 .11 .00 .13 .37 .00 .00 .00 1.0 28 .38 .48 .41 .12 .60 .07 .09 .33 .00 .05 .00 1.1 29 .49 .42 .29 .10 6.8 .08 .33 .00 .04 .00 .76 30 .32 .41 .38 .09 .41 .07 .32 .00 .00 .00 .62 31 .25 --- .40 .08 .25 --- .28 --- .00 .00 --- TOTAL 36.33 225.13 11.24 6.55 1.01 8.44 7.83 258.06 1.79 7.99 3.71 49.28 MEAN 1.17 7.50 .36 .21 .04 .27 .26 8.32 .06 .26 .12 1.64 MAX 16 68 1.4 2.1 .60 6.8 5.2 129 .25 2.7 1.9 18 MIN .25 .41 .23 .00 .00 .00 .00 .02 .00 .00 .00 .00 CFSM 1.43 9.15 .44 .26 .04 .33 .32 10.1 .07 .32 .15 2.00 IN. 1.65 10.21 .51 .30 .05 .38 .36 11.71 .08 .36 .17 2.24 AC-FT 72 447 22 13 2.0 17 16 512 3.6 16 7.4 98 WTR YR 1985 TOTAL 617.36 MEAN 1.69 MAX 129 MIN .00 CFSM 2.06 IN. 28.01 AC-FT 1220 166 RIO GRANDE DE LOIZA BASIN 50055650 QUEBRADA CAIMITO NEAR JUNCOS, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS JUNE 1984 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 0.5 378 24.5 APR, 01 0900 0.2 3920 22.0 JAN, 11 1047 0.3 373 25.0 SEP, 03 1148 0.09 359 34.5 I I I I I 167 RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, PR LOCATION.--Lat 18°12'58", long 65056'34", 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 i (1.6 km) south of Juncos. DRAINAGE AREA.--16.4 aq mi (42.5 aq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1971 to current year. GAGE.--Water-stage recorder. Elevation of gage is 320 ft (98 m), fro topographic map. REMARKS.--Estimated daily discharges: Nov. 2-9 and June 14 to July 2. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--14 years (1972-85), 50.7 cu ft/a (1.436 cu /s), 41.98 in/yr (1,066 mm/yr), 36,730 acre-ft/yr (45.3 cu hm/yr); median of yearly mean discharges, 51 cu ft/s (1.44 cu m/s), 36,900 acre-ft/yr (45 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 25,700 cu ft/s (728 cu m/s), May 18, 1985, gage height, 21.30 ft (6.492 m), from rating curve extended above 100 cu ft/a (2.83 cu m/s) on basis of slope-area measurement and step-backwater analysis; minimum discharge, 2.0 cu ft/s (0.057 cu m/s), May 11, 1984, gage height, 0.13 ft (0.040 a). EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate discharges (no stages were recorded) of major floods are as follows: Sept. 6, 1960, 37,100 cu ft/a (1,050 cu m/s); Oct. 9, 1970, 18,200 cu ft/s (515 cu m/s). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,400 cu ft/a (96.3 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (Cu m/s) (ft) (m) Date Time (cu ft/s) (cu /a) (ft) (a) May 15 1415 11,800 334 14.25 4.343 Sept. 12 2015 4,150 118 8.38 2.554 May 18 0545 *25,700 728 *21.30 6.492 Minimum discharge, 8.5 cu ft/a (0.241 cu m/s), Mar. 25, 26. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 44 93 30 35 17 18 23 15 24 13 18 18 2 43 325 45 46 14 12 18 14 23 16 22 17 3 65 1350 41 25 13 13 14 15 21 12 18 17 4 46 330 31 31 13 11 13 14 20 11 16 14 5 42 860 29 26 12 13 12 15 21 12 15 17 6 59 920 28 29 12 16 13 17 20 11 19 13 7 68 470 26 22 11 52 16 13 20 10 27 12 8 53 170 25 21 11 36 14 13 25 12 20 86 9 138 116 30 19 11 17 14 15 21 14 20 43 10 121 112 28 20 11 14 11 13 20 11 16 18 11 80 85 205 20 12 13 25 15 18 13 15 22 12 70 74 216 18 11 13 26 30 19 16 15 631 13 96 67 59 18 10 12 17 21 17 12 31 554 14 85 93 37 17 12 11 14 245 17 11 20 98 15 80 93 32 16 13 9.8 21 2250 16 49 17 58 16 62 60 28 16 12 10 27 284 15 63 16 40 17 53 57 30 16 12 11 21 751 14 93 15 30 18 45 54 23 16 13 26 15 3910 14 29 15 25 19 41 47 24 16 13 13 15 180 13 21 17 20 20 51 43 23 16 21 11 12 84 13 148 14 21 21 40 40 22 16 13 10 12 63 12 38 17 20 22 38 39 21 16 12 10 13 51 12 24 16 20 23 36 46 21 15 12 10 530 43 13 21 14 24 24 34 37 24 15 12 9.3 144 41 12 33 13 31 25 61 35 31 15 12 9.1 83 40 12 20 16 145 26 44 36 26 18 11 11 46 36 11 30 14 42 27 38 35 24 16 22 10 26 32 12 19 159 31 28 44 33 27 16 44 10 20 31 11 28 54 46 29 35 35 21 15 --- 509 18 28 11 21 18 52 30 31 33 26 14 53 17 27 11 19 20 37 31 32 --- 21 14 48 --- 25 --- 16 15 --- TOTAL 1775 5788 1254 613 392 1021.2 1250 8331 488 846 722 2202 MEAN 57.3 193 40.5 19.8 14.0 32.9 41.7 269 16.3 27.3 23.3 73.4 MAX 138 1350 216 46 44 509 530 3910 25 148 159 631 MIN 31 33 21 14 10 9.1 11 13 11 10 13 12 CFSM 3.49 11.8 2.47 1.21 .85 2.01 2.54 16.4 .99 1.66 1.42 4.48 IN. 4.03 13.13 2.84 1.39 .89 2.32 2.84 18.90 1.11 1.92 1.64 4.99 AC-FT 3520 11480 2490 1220 778 2030 2480 16520 968 1680 1430 4370 CAL YR 1984 TOTAL 19934.9 MEAN 54.5 MAX 1350 MIN 4.2 CFSM 3.32 IN. 45.22 AC-FT 39540 WTR YR 1985 TOTAL 24682.2 MEAN 67.6 MAX 3910 MIN 9.1 CFSM 4.12 IN. 55.99 AC-FT 48960 RIO GRANDE DE LOIZA BASIN 168 50066400 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 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CPS) (CHAOS) (DEG C) (CFS) (UMUOS) (DEG C) DEC, 06 1615 29 265 25.0 MAR, 04 1113 11 298 24.0 JAN, 11 1212 20 250 23.5 APR, 09 1300 14 321 28.0 FEB, 12 1020 11 294 21.5 SEP, 03 0958 17 245 26.5 I I I I I RIO GRANDE DE LOIZA BASIN 169 50056900 QUEBRADA MAMEY NEAR GURABO, PR LOCATION.--Lat 18°14'57", long 65°56'44", Hydrologic Unit 21010005, at left downstream aide 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 sq i (5.96 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--December 1983 to current year. GAGE.--Water-stage recorder. Elevation of gage is 180 ft (55 ), from topographic nap. REMARKS.--Estimated daily dicharges: July 16-23, 29-31 and Sept. 14-23. Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,690 cu ft/s (47.9 cu m/s), May 15, 1985, gage height, 9.42 ft (2.871 ), from floodmark, from rating curve extended above 400 cu ft/s (11.3 cu m/s) on basis of indirect measurement of peak flow and step-backwater analysis; minimum discharge, 0.24 (0.007 cu m/s), Aug. 30, 1984, gage height, 2.84 ft (0.866 ). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 400 cu ft/s (11.3 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ou ft/a) (ou m/s) (ft) (a) Date Time (cu ft/s) (cu m/s) (ft) (s) Oct. 14 0630 434 12.3 6.53 1.990 Mar. 29 0245 478 13.5 6.68 2.036 Oct. 30 1500 434 12.3 6.53 1.990 May 15 1400 *1,690 47.9 *9.42 2.871 Nov. 2 2146 454 12.8 6.60 2.012 May 17 1145 1,440 40.8 8.95 2.728 Nov. 3 0130 565 16.0 6.95 2.118 May 18 0645 1,190 33.7 8.43 2.569 Nov. 5 1630 561 15.9 6.94 2.115 Minimum discharge, 0.26 ou ft/s (0.007 cu /c), May 9-11. REVISIONS.--The maximum discharge for 1984 water year has been revised to 1,100 cu ft/a, June 10, 1984, gage height 8.11 ft. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 1.3 1.3 1.5 1.4 14 3.0 48 116 60 111 1.5 4.8 2.1 1.7 1.6 2.1 9.9 1.6 1.4 1.3 .76 .73 .69 .66 .62 1.3 .86 .81 .84 .88 .95 .83 .86 .74 .72 .36 .36 .35 .32 .32 .81 .80 .80 .78 .77 .68 .67 .67 .67 .61 .74 .73 .68 .66 .76 .59 .61 .55 .47 .51 6 7 8 9 10 3.0 1.5 1.3 16 6.9 140 54 10 9.4 18 1.6 1.5 1.5 1.6 1.6 1.5 1.6 1.3 1.2 1.1 .61 .60 .69 .58 .57 1.0 1.1 1.1 .88 .87 .73 .70 .68 .66 .61 .32 .30 .29 .28 .28 .76 .73 .75 .73 .70 .56 .57 .56 .55 .49 .59 .48 .43 .40 .40 .63 .51 2.1 1.7 .65 11 12 13 14 15 2.3 1.7 3.4 43 3.7 4.1 2.9 2.5 4.2 4.0 4.7 3.8 1.5 1.4 1.3 1.1 1.0 .96 .96 .93 .56 .55 .53 .53 .59 .86 .87 .86 .87 .87 .58 .57 .60 .56 .61 .29 .36 .36 5.6 163 .68 .67 .64 .61 .60 .47 .47 .46 .47 4.6 .38 .42 .84 .52 .47 .58 17 34 3.1 1.7 16 17 18 19 20 2.9 11 4.3 2.0 1.7 2.3 2.5 2.2 2.0 1.9 1.7 1.4 1.3 1.3 1.3 .89 .89 .86 .82 .79 .61 .62 .74 .72 .74 .91 .95 1.1 .92 .81 .82 .62 .55 .49 .48 11 164 239 9.9 3.3 .63 .63 .63 .64 .62 1.2 .88 .80 .90 4.4 .43 .39 .44 .44 .38 1.2 .90 .75 .60 .63 21 22 23 24 25 13 3.0 1.9 1.6 14 1.9 1.9 2.0 1.9 1.9 1.3 1.2 1.3 1.7 1.6 .78 .77 .78 .73 .74 .72 .73 .70 .74 .77 .79 .78 .79 .79 .75 .46 .43 35 4.6 1.5 2.1 1.6 1.4 1.2 1.1 .68 .66 .63 .64 .65 1.1 .80 .82 .81 .82 .85 .51 .43 .40 .38 .60 .60 .72 2.0 27 26 27 28 29 30 31 2.5 2.0 12 3.9 44 4.4 2.1 1.8 1.8 1.7 1.5 --- 1.4 1.6 1.4 1.3 2.5 1.8 .86 .79 .80 .75 .74 .74 .78 1.0 7.0 --- .77 .78 .98 82 1.8 1.9 .66 .51 .43 .41 .39 --- 1.0 .99 .94 .89 .86 .83 .70 .66 .62 .60 .60 --- .81 .73 .81 .84 .80 .77 .47 6.5 1.1 .68 .54 .51 1.8 2.0 4.4 1.8 1.1 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 226.5 7.31 44 1.3 3.18 3.66 449 616.5 20.6 140 1.5 8.96 9.97 1220 56.3 1.82 4.8 1.2 .79 .91 112 40.67 1.31 9.9 .73 .57 .66 81 25.04 .89 7.0 .53 .39 .40 50 110.79 3.57 82 .75 1.55 1.79 220 57.75 1.92 35 .39 .83 .93 115 612.88 19.8 239 .28 8.61 9.91 1220 20.42 .68 .81 .60 .30 .33 41 29.79 .96 4.6 .46 .42 .48 59 22.95 .74 6.5 .38 .32 .37 46 110.80 3.69 34 .47 1.60 1.79 220 CAL YR 1984 WTR YR 1985 TOTAL TOTAL 1521.36 1930.39 MEAN MEAN 4.16 5.29 MAX MAX 140 239 MIN MIN .28 .28 CFSM CFSM 1.81 2.30 IN. IN. 24.61 31.22 AC-FT AC-FT 3020 3830 RIO GRANDE DE LOIZA BASIN 170 50056900 QUEBRADA HANEY NEAR GURABO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS MARCH 1984 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1320 1.6 608 25.5 MAR, 05 1138 0.8 721 23.5 JAN, 15 0922 1.0 608 20.5 SEP, 04 1125 0.5 599 27.5 FEB, 13 1205 0.6 696 23.0 I I I I I I I RIO GRANDE DR 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, 171 0.3 mi (0.5 km) east of Gurabo, and 4.5 i (7.6 km) upstream from Rio Grande de Loiza. DRAINAGE AREA.--60.2 sq mi (155.9 sq km). 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. Elevation of gage is 136.58 ft (41.63 ) above mean sea level. REMARKS.--Estimated daily discharges: Oct. 1-7, 12, 13, 17, 21, 22 and Nov. 10-15, 17, 18, 20-23. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--26 years (1960-85), 133 ou ft/a (3.766 cu a/s), 30.00 in/yr (762 mm/yr), 96,360 acre-ft/yr (119 cu hm/yr); median of yearly mean discharges, 127 cu ft/s (3.60 cu m/s), 92,000 acre-ft/yr (113 cu ha/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 74,600 cu ft/s (2,133 cu /s), Sept. 6, 1960, gage height, 27.7 ft (8.44 ), from floodmark, from rating curve extended above 8,000 cu ft/s (227 cu a/s) on basis of slope-area measurement at gage height 21.6 ft (6.58 ), 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 fro intervening area; minimum discharge, 4.5 cu ft/s (0.127 cu 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 cu ft/s (85.0 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (a) Date Time (cu ft/s) (cu m/s) (ft) (m) Oct. 14 0900 5,890 167 12.25 3.734 May 15 1630 22,000 623 20.09 6.123 Nov. 3 0730 5,170 146 11.39 3.472 May 16 0015 6,810 184 12.91 3.935 Nov. 5 1915 7,560 214 13.94 2.249 May 17 1400 5,810 164 12.16 3.706 Nov. 6 1515 6,090 172 12.49 3.807 May 18 0800 *38,200 1,080 *23.35 7.117 Mar. 29 0646 4,940 140 11.10 3.383 Sept. 12 2345 6,050 171 12.44 3.792 Apr. 23 1900 3,870 110 9.68 2.960 Sept. 13 1300 3,210 90.9 8.71 2.655 Minimum discharge, 15 cu ft/s (0.425 cu /s), Mar. 26. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 65 165 72 63 32 99 78 35 51 24 29 56 2 55 391 154 287 33 48 49 33 49 27 55 45 3 120 2440 147 96 29 36 40 40 49 25 39 41 4 80 1180 86 79 27 32 35 36 47 27 31 32 5 95 2940 74 68 26 28 31 33 45 22 28 82 6 115 3850 67 97 25 21 30 38 42 23 27 50 7 75 2070 63 88 25 77 32 33 41 21 38 30 8 47 599 59 60 24 162 30 29 43 22 31 208 9 486 510 58 52 24 79 29 28 43 23 30 247 10 430 320 81 51 24 47 27 28 42 24 43 58 11 172 200 171 50 26 35 25 28 41 23 36 50 12 160 150 334 44 24 29 51 45 39 26 32 695 13 110 145 160 42 22 28 33 66 32 27 49 2380 14 1410 240 76 40 22 24 31 436 30 24 45 343 15 241 325 65 40 29 22 41 5930 27 101 32 173 16 161 148 65 38 27 22 55 1370 27 218 27 101 17 195 165 80 36 27 24 55 2120 28 195 26 83 18 119 160 61 36 30 41 46 10900 29 88 23 59 19 94 134 54 34 29 45 36 664 28 48 27 49 20 126 125 54 34 45 26 27 280 27 401 29 41 21 125 115 48 32 32 34 29 165 29 126 41 37 22 80 110 47 31 28 23 25 130 27 65 36 35 23 76 125 46 30 25 20 1020 107 26 51 27 40 24 68 109 54 30 37 19 426 93 26 77 26 87 25 136 100 81 29 37 17 206 84 29 53 26 778 26 95 211 70 36 34 16 133 76 28 51 31 137 27 80 104 84 35 48 23 68 69 26 42 466 98 28 123 91 104 34 273 35 49 63 23 42 229 253 29 139 81 62 33 --- 1530 42 57 23 49 77 159 30 145 79 79 30 147 39 55 20 41 46 75 31 92 --- 87 30 245 --- 52 --- 32 52 --- TOTAL 5515 17382 2743 1685 1064 3024 2818 23123 1017 2018 1734 6522 MEAN 178 579 88.5 54.4 38.0 97.5 93.9 746 33.9 65.1 55.9 217 MAX 1410 3850 334 287 273 1530 1020 10900 51 401 466 2380 MIN 47 79 46 29 22 16 25 28 20 21 23 30 CFSM 2.96 9.62 1.47 .90 .63 1.62 1.56 12.4 .56 1.08 .93 3.60 IN. 3.41 10.74 1.70 1.04 .66 1.87 1.74 14.29 .63 1.25 1.07 4.03 AC-FT 10940 34480 5440 3340 2110 6000 5590 45860 2020 4000 3440 12940 CAL YR 1984 TOTAL 50402.2 MEAN 138 MAX 3850 MIN 8.6 CFSM 2.29 IN. 31.15 AC-FT 99970 WTR YR 1985 TOTAL 68645 MEAN 188 MAX 10900 MIN 16 CFSM 3.12 IN. 42.42 AC-FT 136200 RIO GRANDE DE LOIZA BASIN 172 50057000 RIO GURABO AT GURABO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCR TURE DATE TIME INSTANTANEOUS DUCTANCR TUBE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) DEC, 06 1022 66 350 24.0 APR, 02 1110 48 348 25.0 FEB, 13 1450 22 407 22.5 SEP, 04 1001 32 326 29.0 MAR, 05 0954 27 410 25.0 173 RIO GRANDE DE LOIZA BASIN 50057025 RIO GURABO NEAR GURABO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°15'56", 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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ARCH ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 25... 0935 175 306 7.40 26.5 40 6.1 75 24 JAN 1985 23... 1105 8.0 408 7.60 25.0 15 6.1 73 30 K19000 K500 APR 19... 0915 22 365 7.40 28.0 10 5.0 64 23 2300 K100 JUN 17... 1220 23 410 7.70 10.0 9.0 5.8 51 <10 K6600 K1200 JUL 29... 1310 50 359 7.60 29.5 6.0 6.8 88 38 440 K40 ALKA- MAGNE- SODIUM POTAS- LINITY CHLO- HARD- CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1984 25... 100 23 11 23 1 3.9 103 17 23 JAN 1985 23... 130 30 14 32 1 4.5 133 <0.5 23 32 APR 19... 122 JUN 17... 120 28 13 29 1 4.1 130 <0.5 24 31 JUL 29... 106 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) 3IO2) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1984 25... 0.1 27 190 90 104 1.15 0.15 1.30 0.32 0.98 JAN 1985 23... 0.1 31 250 5.3 17 1.36 0.14 1.50 0.27 0.43 APR 19... 22 0.82 0.08 0.90 0.31 0.99 JUN 17... 0.2 31 240 15 24 1.03 0.07 1.10 0.21 0.89 JUL 29... 6 1.01 0.09 1.10 0.18 0.72 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 1984 25... 1.3 2.6 12 0.54 JAN 1985 23... 0.7 2.2 9.7 0.69 2 100 30 <1 <1 <10 APR 19... 1.3 2.2 9.7 0.53 JUN 17... 1.1 2.2 9.7 0.46 1 100 30 <1 3 <10 JUL 29... 0.9 2.0 8.9 0.54 K = non-ideal count RIO GRANDH DE LOIZA BASIN 174 50057025 RIO GURABO NEAR GURABO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SHLE- 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) (ma) OCT 1984 25... -- JAN 1985 23... 840 1 390 (0.1 <1 <1 30 (0.01 3 0.05 APR 19... <0.1 JUN 17... 1400 (1 370 (0.1 <1 <1 40 (0.01 6 0.06 JUL 29... RIO GRANDE DE LOIZA BASIN 175 50059000 LAGO LOIZA AT DAMSITE, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°19'49", long 66°01'00", at puaphouse at damaite, and 1.9 ai (3.1 km) south of Tru- jillo Alto plaza. DRAINAGE AREA.--208 aq ai (539 aq km). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH OXYGEN, (PER- ICAL 0.7 EP AGAR INSTAN- DUCT- (STAND- TEMPER- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 23... 1300 124 186 6.80 27.0 3.5 44 14 K1300 K210 JAN 1985 23... 1345 124 294 7.40 25.0 4.6 55 24 K43 370 APR 19... 1240 124 247 7.00 27.5 0 15 110 K18 JUN 12... 1230 124 220 7.70 300.0 2.9 38 <10 JUL 26... 1210 124 167 7.30 29.5 4.4 57 35 52 128 ALKA- SOLIDS, NITRO- LINITY RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- WH WAT AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- TOTAL 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) OCT 1984 23... 54 17 0.43 0.07 0.50 0.22 0.68 0.9 1.4 JAN 1985 23... 97 <0.5 4 0.27 0.03 0.30 0.06 0.84 0.7 1.0 APR 19... 80 26 0.02 <0.10 0.19 2.0 2.2 JUN 12... 69 <0.5 10 0.08 0.02 0.10 0.10 0.5 0.6 0.7 JUL 26... 84 55 0.08 0.02 0.10 0.35 1.8 2.2 2.3 MANGA- METHY- BORON, COPPER, IRON, NESE, ZINC, LENS 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 2N) AS CN) (UG/L) (MG/L) OCT 1984 23... 6.2 0.23 JAN 1985 23... 4.4 0.17 20 <10 320 200 30 <0.01 7 APR 19... 0.13 JUN 12... 3.1 0.06 30 10 550 120 10 <0.01 7 0.02 JUL 26... 10 0.47 K = non-ideal count I I I I RIO GRANDE DE LOIZA BASIN 50059100 RIO GRANDE DE LOIZA BELOW TRUJILLO ALTO, PR 176 WATER-QUALITY RECORDS LOCATION.--Lat 18°21'35", long 66°00'15", 100 ft (30 ) downstream of Highway 181 bridge, 0.4 i (0.6 kn) northwest of Trujillo Alto plaza, and 2.2 i (3.5 km) northeast of Lago Loiza Reservoir. DRAINAGE AREA.--213 sq i (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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 23... 1015 500 188 7.40 26.6 0.4 8.1 100 19 K1400 610 JAN 1985 26... 1245 16 399 8.00 27.0 2.0 9.2 114 30 K16000 K45 APR 19... 1000 14 292 7.80 26.0 3.3 8.1 99 <10 K50000 3100 JUN 12... 1610 8.4 312 8.50 31.0 1.0 9.2 123 <10 K1500 36 JUL 26... 1010 15 340 7.80 29.5 6.8 7.9 102 26 K9500 970 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 3) AS SO4) AS CL) OCT 1984 23... 57 1 14 5.4 15 0.9 3.0 56 12 14 JAN 1985 26... 140 34 14 27 1 2.8 144 <0.5 19 29 APR 19... 98 JUN 12... 110 27 10 22 0.9 2.3 110 <0.5 21 22 JUL 26... 108 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 1984 23... 0.1 20 120 158 18 0.64 0.06 0.70 0.12 1.1 JAN 1985 26... 0.2 24 240 10 2 0.47 0.03 0.50 0.09 APR 19... 26 0.36 0.04 0.40 0.14 0.66 JUN 12... 0.2 22 190 4.4 4 <0.01 0.10 0.21 0.09 JUL 26... 9 0.38 0.02 0.40 0.03 0.37 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 1984 23... 1.2 1.9 8.4 0.23 JAN 1985 26... <0.1 0.30 1 <100 30 1 1 <10 APR 19... 0.8 1.2 5.3 0.18 JUN 12... 0.3 0.4 1.8 0.09 <1 <100 30 <1 4 <10 JUL 26... 0.4 0.8 3.5 0.17 K = non-ideal count RIO GRANDE DE LOIZA BASIN 177 50059100 RIO GRANDE DE LOIZA BELOW TRUJILLO ALTO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1984 23... JAN 1985 26... 330 1 50 0.1 2 <1 20 <0.01 1 0.05 APR 19... 0.1 JUN 12... 250 <1 20 <0.1 <1 <1 <10 <0.01 2 0.03 JUL 26... I I I I I 178 RIO GRANDE DR 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 i (2.4 km) south of Campo Rico, and 4.4 mi (7.1 km) south of Loiza. DRAINAGE AREA.--9.84 sq mi (25.48 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1967 to current year. GAGE.--Water-stage recorder. Elevation of gage is 225 ft (68 m), from topographic map. REMARKS.--Estimated daily discharges: Oct. 16, 17, Nov. 14-27, and July 20-23. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--18 years (1968-85), 28.1 cu ft/s (0.796 cu /s), 38.78 in/yr (985 mm/yr), 20,360 acre-ft/yr (25.1 cu hm/yr); median of yearly mean discharges, 25 cu ft/a (0.71 cu m/s), 18,100 acre-ft/yr (22 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 15,000 cu ft/s (425 cu m/s), Sept. 13, 1982, gage height, 13.1 ft (3.99 m), from floodmarks, fro rating curve extended above 350 cu ft/s (9.91 cu m/s) on basis of slope-area measurements and step-backwater analysis made in 1981; minimum daily discharge, 0.80 cu ft/s (0.023 cu m/a), July 24, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 cu ft/s (70.8 cu /a) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Mar. 29 0100 2,930 83.0 6.78 2.066 May 17 1230 3,310 93.7 7.12 2.170 May 15 1500 *6,080 172 *9.23 2.813 May 18 0545 3,040 86.1 6.88 2.097 Minimum discharge, 4.5 cu ft/s (0.127 cu m/s), July 9. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 9.3 30 20 38 13 25 25 7.4 17 5.8 10 11 2 8.6 42 36 58 12 14 18 7.3 16 5.7 16 9.6 3 8.5 222 31 49 11 12 16 11 17 5.6 9.3 9.3 4 9.0 88 24 39 11 10 14 7.9 16 6.6 7.7 8.5 5 18 399 23 28 11 11 14 7.2 14 5.5 7.2 8.1 6 15 814 20 27 10 13 12 7.3 13 5.3 8.9 14 7 10 550 18 26 11 30 13 6.7 13 5.3 7.4 9.0 8 8.7 193 17 23 10 42 12 6.2 12 4.9 7.2 31 9 27 185 24 21 9.9 24 11 6.1 12 4.8 7.1 28 10 23 85 30 21 9.9 15 10 6.1 11 4.9 6.4 11 11 18 63 70 24 10 12 9.8 6.2 11 5.0 6.0 9.6 12 15 56 40 19 9.7 11 9.8 7.2 11 5.0 6.1 30 13 11 47 21 18 9.5 11 9.6 9.9 9.9 5.0 9.4 345 14 130 150 18 18 9.5 9.8 9.5 37 9.2 5.0 7.3 59 15 41 190 17 20 9.5 9.4 9.4 691 8.8 39 6.5 34 16 28 50 22 17 9.5 8.7 10 99 8.3 58 5.8 21 17 21 106 83 15 9.5 8.9 11 513 8.1 67 5.2 17 18 24 44 26 15 9.8 9.2 12 898 7.7 20 5.4 16 19 49 77 24 14 9.9 11 9.1 124 7.6 11 7.1 14 20 27 55 22 14 9.9 8.6 8.5 61 6.9 145 5.9 13 21 40 35 18 13 9.9 8.4 8.7 47 6.7 36 6.7 11 22 31 38 23 12 9.9 7.9 7.6 39 6.2 16 6.6 11 23 22 55 18 14 9.9 8.0 114 34 6.0 15 6.0 31 24 16 29 20 13 19 7.7 37 30 6.1 14 6.3 34 25 45 25 28 12 17 7.2 15 29 6.1 12 6.7 205 26 24 25 32 12 16 7.1 11 25 5.9 14 6.4 32 27 24 29 65 13 33 35 9.4 23 5.8 11 121 21 28 98 23 78 13 96 28 8.8 21 5.8 12 51 114 29 69 22 34 12 408 7.9 20 5.8 13 17 35 30 49 21 46 12 70 7.7 19 5.8 12 55 26 31 32 --- 55 11 54 --- 17 --- 8.9 16 --- TOTAL 951.1 3746 1003 635 416.3 936.9 470.8 2823.5 288.7 577.3 450.6 1218.1 MEAN 30.7 125 32.4 20.5 14.9 30.2 15.7 91.1 9.62 18.6 14.5 40.6 MAX 130 814 83 58 96 408 114 898 17 145 121 345 MIN 8.5 21 17 11 9.5 7.1 7.6 6.1 5.8 4.8 5.2 8.1 CFSM 3.12 12.7 3.29 2.08 1.61 3.07 1.60 9.26 .98 1.89 1.47 4.13 IN. 3.60 14.16 3.79 2.40 1.57 3.54 1.78 10.67 1.09 2.18 1.70 4.61 AC-FT 1890 7430 1990 1260 826 1860 934 5600 573 1150 894 2420 CAL YR 1984 TOTAL 9202.6 MEAN 25.1 MAX 814 MIN 2.8 CFSM 2.56 IN. 34.79 AC-FT 18250 WTR YR 1985 TOTAL 13517.3 MEAN 37.0 MAX 898 MIN 4.8 CFSM 3.76 IN. 51.10 AC-FT 26810 RIO GRANDE DE LOIZA BASIN 50061800 RIO CANOVANAS NEAR CAMPO RICO, PR--Continued 179 WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMEOS) (DEG C) (CPS) (LIMBOS) (DEG C) FEB, 12 1305 9.7 250 23.0 APR, 10 1442 12 226 27.0 181 ATLANTIC OCEAN 6 Coastal basin 063 RIO RANDE 0 6935 06 Falarda 29 Rio Grande de Loin. basin CEI8A Drainage boundary---- LAS PIEDRAS . 0777 10 0787 R.O Humacao basin \t„ HUMACAO . Coastal basin 173 Map area SAN JUAN ASUAOILLA RECI80 MAYAGUEZ P01 MAMMA. EXPLANATION A0670 SURFACE-WATER STATION AND NUMBER 80660 LOW-FLOW STATION AND NUMBER V0725 QUALITY-OF-WATER STATION AND NUMBER 40173 WELL AND WELL NUMBER 2 3 4 5 KILOMETERS 11 I 2 3 4 5 MILES Figure 21.--Northeastern river basins--Rio Herrera to Rio Anton Ruiz basins. I I I I I I I 182 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 186, and about 1.2 mi (1.9 km) south of El Verde. DRAINAGE AREA.--1.01 sq mi (2.62 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1983 to current year. GAGE.--Water-stage recorder. Elevation of gage is 1,230 ft (375 ), from topographic ap. REMARKS.--Estimated daily discharges: Jan. 5-21. Records poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,160 cu ft/s (61.2 ou /s), May 14, 1985, gage height, 9.36 ft (2.853 ) fro rating curve extended above 20 cu ft/s (0.57 cu /a) on basis of step-backwater analysis; minimum discharge, 0.20 cu ft/s (0.006 cu a/s), July 14, 15, 1985, gage height 2.08 ft (0.634 a). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 cu ft/s (14.2 cu /s) and maximum (*): Discharge Gage height Date Tine (cu ft/a) (cu a/a) (ft) (m) May 14 1415 *2,160 61.2 $9.36 2.853 Minimum discharge, 0.20 Cu ft/s (0.006 cu m/s), July 14, 15. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 3.9 21 4.4 6.4 2.9 9.4 4.5 1.2 1.9 2.3 1.3 5.9 2 10 25 18 14 1.7 4.2 3.0 1.1 1.8 1.3 1.3 5.7 3 3.0 41 9.7 12 1.8 3.1 2.5 1.1 1.8 2.4 1.4 3.3 4 2.1 25 6.2 5.9 1.4 2.7 2.2 .97 1.7 5.8 1.1 2.1 5 4.8 64 5.6 3.8 1.1 5.8 2.1 .98 1.6 1.7 1.1 1.7 6 5.9 69 5.7 6.8 .95 4.9 1.9 .95 1.5 .79 2.3 1.6 7 2.6 49 4.2 3.7 .78 22 2.3 .84 1.4 .58 4.3 2.3 8 2.4 38 3.7 3.0 .69 14 2.4 .90 1.3 .48 5.8 8.2 9 13 24 19 2.8 .62 6.4 1.6 .80 1.2 .41 1.6 4.2 10 4.7 14 12 5.0 .61 3.5 1.4 1.1 1.3 .35 1.1 2.0 11 3.7 8.9 6.3 4.8 1.6 2.8 1.3 1.9 1.3 3.9 .88 5.9 12 3.3 11 5.5 2.7 1.3 2.8 1.4 17 1.1 .79 1.3 39 13 3.8 11 4.6 2.4 .79 2.6 4.4 5.3 .97 .37 9.2 57 14 10 64 4.3 6.8 .88 2.3 2.0 99 .88 .23 3.9 9.9 15 7.3 20 4.1 3.3 5.3 2.6 1.3 50 1.1 17 7.2 5.8 16 5.5 8.8 5.4 2.1 1.9 2.3 16 18 .92 5.2 2.2 3.8 17 11 17 18 2.0 2.0 2.5 20 48 .78 23 1.4 3.1 18 6.4 8.1 5.1 1.8 2.6 3.4 5.3 46 .71 2.5 4.1 2.7 19 3.3 16 5.3 1.6 5.2 2.2 2.5 12 .77 1.6 7.9 2.3 20 17 9.4 6.4 1.6 2.7 1.8 8.3 7.4 .63 46 2.5 2.0 21 24 6.6 4.5 1.5 1.9 1.6 3.9 5.7 .62 8.7 6.0 1.8 22 12 7.6 5.4 1.2 2.6 1.5 1.9 4.2 .57 2.6 2.5 1.7 23 5.3 11 4.2 1.2 4.6 1.4 32 3.4 .56 7.1 1.6 15 24 4.1 5.4 5.2 1.1 14 1.3 5.5 3.1 .54 10 1.4 9.7 25 12 4.7 8.7 1.1 5.3 1.2 2.8 2.8 .48 3.5 1.9 42 26 11 4.9 10 1.8 9.0 1.3 2.1 2.5 .44 3.0 3.1 11 27 12 6.4 14 1.4 47 28 1.8 2.3 .41 1.9 43 4.6 28 31 5.2 8.8 1.2 43 24 1.6 2.2 .39 8.2 21 22 29 13 4.1 7.5 .98 --- 70 1.5 2.1 .36 4.0 4.3 5.4 30 16 3.8 21 .93 43 1.3 2.0 .46 2.3 8.3 3.3 31 17 --- 20 .84 11 --- 1.9 --- 1.6 3.6 --- TOTAL 281.1 603.9 261.8 105.75 164.22 285.6 140.8 346.74 29.49 169.60 158.58 285.0 MEAN 9.07 20.1 8.45 3.41 5.86 9.21 4.69 11.2 .98 5.47 5.12 9.50 MAX 31 69 21 14 47 70 32 99 1.9 46 43 57 MIN 2.1 3.8 3.7 .84 .61 1.2 1.3 .80 .36 .23 .88 1.6 CFSM 8.98 19.9 8.37 3.38 5.80 9.12 4.64 11.1 .97 5.42 5.07 9.41 IN. 10.35 22.24 9.64 3.89 6.05 10.52 5.19 12.77 1.09 6.25 5.84 10.50 AC-FT 558 1200 519 210 326 566 279 688 58 336 315 565 CAL YR 1984 TOTAL 2748.05 MEAN 7.51 MAX 69 MIN .39 CFSM 7.44 IN. 101.22 AC-FT 5450 WTR YR 1985 TOTAL 2832.58 MEAN 7.76 MAX 99 MIN .23 CFSM 7.68 IN. 104.33 AC-FT 5620 RIO ESPIRITU SANTO BASIN 50063440 QUEBRADA SONADORA NEAR EL VERDE, PR--Continued 183 WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1983 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURK (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) FEB, 12 0923 1.4 61 19.5 MAR, 14 1356 2.3 64 20.0 I I 184 RIO ESPIRITU SANTO BASIN 50063500 QUEBRADA TORONJA AT EL VERDE, PR LOCATION.--Lat 18019'43", long 65°49'14", Hydrologic Unit 21010005, in Caribbean National Forest, at downstream aide of culvert on Highway 186, 0.2 mi (0.4 km) upstream fro Rio Espiritu Santo, and about 0.9 mi (1.4 km) south of El Verde. DRAINAGE AREA.--0.064 sq mi (0.166 sq 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.--Estimated daily discharges: Feb. 4-11 and Sept. 14-30. Records poor. EXTREMES FOR PERIOD OF RECORD.--Maximu discharge, 18 ou ft/s (0.51 cu m/s), July 5, 1983, gage height, 1.71 ft (0.521 m), from rating curve extended above 1.0 cu ft/s (0.03 a) 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 cu ft/s (0.37 cu m/s) (revised) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (a) Date Time (cu ft/s) (cu m/s) (ft) (a) Oct. 17 1815 10 0.28 1.61 0.491 Mar. 29 0015 11 0.31 1.61 0.491 Feb. 27 1645 11 0.31 1.61 0.491 May 14 1415 *12 0.34 *1.62 0.494 Feb. 28 1230 10 0.28 1.60 0.488 Minimum discharge, 0.02 cu ft/s (0.001 cu m/s), July 9, 13. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 .06 .15 .07 .06 .14 .70 .83 2.6 1.4 3.8 .35 .81 .47 .41 .36 .45 .62 .66 .44 .36 .10 .07 .08 .07 .06 .61 .27 .20 .18 .26 .34 .27 .23 .20 .18 .09 .09 .09 .09 .09 .12 .13 .12 .12 .12 .10 .06 .05 .06 .03 .06 .07 .06 .06 .06 .19 .19 .14 .11 .10 6 7 8 9 10 .10 .06 .05 .17 .08 3.7 3.7 3.0 1.9 1.3 .36 .32 .32 1.3 .72 .36 .34 .29 .27 .51 .06 .05 .05 .06 .05 .23 .47 .72 .37 .25 .17 .19 .16 .13 .12 .09 .08 .08 .08 .10 .09 .08 .08 .08 .07 .03 .03 .03 .03 .03 .07 .18 .14 .06 .05 .09 .10 .23 .12 .10 11 12 13 14 15 .06 .05 .05 .06 .12 .94 .80 .72 3.0 1.9 .40 .35 .32 .32 .31 .35 .23 .21 .19 .18 .07 .05 .05 .05 .09 .20 .19 .18 .16 .12 .12 .11 .13 .10 .09 .12 .32 .17 3.0 3.3 .08 .08 .07 .07 .08 .07 .04 .03 .03 .33 .05 .08 .22 .10 .11 .55 2.0 4.0 .49 .25 16 17 18 19 20 .09 .63 .17 .08 .58 .93 1.3 .79 1.2 .81 .38 .68 .34 .35 .32 .18 .18 .17 .15 .15 .05 .04 .04 .06 .05 .12 .11 .11 .09 .09 .24 .36 .16 .11 .16 1.0 2.7 3.4 1.1 .71 .07 .07 .07 .08 .07 .06 .54 .06 .17 1.8 .06 .05 .09 .12 .07 .17 .14 .12 .10 .09 21 22 23 24 25 .48 .38 .22 .14 .28 .66 .68 .70 .50 .44 .23 .23 .22 .25 .27 .14 .12 .12 .11 .13 .05 .05 .08 .27 .08 .09 .07 .07 .07 .07 .13 .10 .45 .21 .15 .52 .39 .29 .25 .22 .07 .07 .06 .07 .07 .24 .09 .12 .16 .10 .11 .06 .05 .06 .10 .08 .08 .07 .05 3.1 26 27 28 29 30 31 .28 .26 .91 .45 .35 .54 .40 .43 .38 .33 .32 --- .29 .53 .29 .27 .84 .96 .12 .12 .10 .09 .09 .09 .29 2.1 2.4 --- .07 .50 .20 2.8 1.7 .66 .13 .12 .12 .11 .11 --- .20 .18 .15 .14 .13 .12 .06 .06 .06 .06 .08 --- .09 .10 .22 .12 .08 .06 .09 2.1 .93 .21 .49 .19 .56 .20 1.3 .24 .15 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 7.02 .23 .91 .05 3.59 4.08 14 40.16 1.34 3.8 .32 20.9 23.34 ' 80 13.57 .44 1.3 .22 6.87 7.89 27 7.52 .24 .66 .09 3.75 4.37 15 6.52 .23 2.4 .04 3.59 3.79 13 11.23 .36 2.8 .07 5.62 6.53 22 5.20 .17 .45 .09 2.66 3.02 10 19.29 .62 3.4 .08 9.69 11.21 38 2.41 .08 .13 .06 1.25 1.40 4.8 4.96 .16 1.8 .03 2.50 2.88 9.8 6.15 .20 2.1 .05 3.12 3.57 12 15.11 .50 4.0 .05 7.81 8.78 30 CAL YR 1984 WTR YR 1985 TOTAL TOTAL 101.36 139.14 MEAN MEAN .28 .38 MAX MAX 3.8 4.0 MIN MIN .02 .03 CFSM CFSM 4.37 5.94 IN. IN. 58.92 80.88 AC-FT AC-FT 201 276 RIO ESPIRITU SANTO BASIN 185 50063500 QUBBRADA TORONJA AT EL VERDE, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1989 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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) FEB, 12 1030 0.06 128 20.5 MAR, 14 1450 0.1 111 22.0 I I I 186 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 ka) upstream from Quebrada Jimenez, and 1.9 mi (3.1 km) southeast of Rio Grande. DRAINAGE AREA.--8.62 sq mi (22.33 sq 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. Elevation of gage is 40 ft (12 a), fro topographic map. REMARKS.--Estimated daily discharges: Jul. 15, 17, 20, and Sept. 12, 13, 23, 25, 28. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--19 years (1967-85), 57.2 cu ft/s (1.620 cu m/s). 90.11 in/yr (2,289 mm/yr), 41,440 acre-ft/yr (51.1 cu hm/yr); median of yearly mean discharges, 52 cu ft/s (1.47 cu m/s), 37,700 acre-ft/yr (46 cu ha/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 12,400 cu ft/s (351 cu m/s), Dec. 2, 1983, gage height, 12.07 ft (3.679 ), from rating curve extended above 600 cu ft/s (17.0 cu m/s) on basis of step-backwater analysis; minimum discharge, 4.0 cu ft/s (0.113 cu m/s), July 3-5, 1975, Apr. 14, 15, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 cu ft/s (85.0 cu m/s) and maximum (5): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu /s) (ft) (a) Date Time (cu ft/s) (cu m/s) (ft) (a) May 14 1500 *8,440 239 *10.43 3.179 May 17 2015 3,220 91.2 7.38 2.249 Minimum discharge, 5.3 cu ft/s (0.150 cu m/s), July 10. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 36 74 26 19 50 178 194 446 196 738 31 132 82 64 46 69 136 123 60 40 22 18 16 15 13 110 39 28 24 43 40 30 26 23 21 13 12 13 12 12 18 17 17 16 14 11 11 12 19 11 12 12 13 11 11 46 44 28 19 17 6 7 8 9 10 57 22 19 102 52 717 545 346 254 133 43 33 27 192 123 44 43 30 27 71 12 12 11 11 11 46 163 164 71 43 20 23 26 18 17 12 11 11 10 13 14 14 13 13 12 7.7 6.7 6.4 6.3 5.9 16 17 49 15 12 16 18 59 41 19 11 12 13 14 15 35 28 34 68 84 86 96 83 551 255 43 42 29 26 25 61 30 25 24 27 21 15 12 12 34 27 27 24 20 20 16 18 31 20 16 17 98 50 794 591 12 12 11 11 13 16 9.9 7.8 6.6 75 11 11 43 29 40 58 500 520 93 47 16 17 18 19 20 51 89 61 40 212 84 176 74 128 92 30 132 34 30 35 22 20 20 19 18 17 16 20 43 27 19 20 26 20 16 107 149 54 25 59 166 547 643 119 60 12 11 11 11 9.9 43 120 24 13 220 17 12 14 63 20 32 27 24 22 21 21 22 23 24 25 197 107 44 29 114 59 64 92 48 41 26 34 25 28 48 17 16 16 16 15 17 18 24 116 41 15 14 14 13 13 35 18 189 58 28 46 38 33 30 28 9.7 9.7 9.6 9.4 9.5 76 20 31 65 27 42 20 14 12 17 20 19 90 55 290 26 27 28 29 30 31 96 102 227 118 121 111 41 48 41 33 30 --- 54 101 61 35 187 183 19 17 16 14 14 13 80 431 518 --- 13 196 63 675 354 111 19 16 15 14 13 --- 25 24 22 20 20 19 9.7 9.1 9.0 9.0 9.3 --- 24 16 43 28 17 13 13 462 215 35 83 31 79 31 160 42 24 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 2425 78.2 227 19 9.07 10.47 4810 5869 196 738 30 22.7 25.33 11640 1971 63.6 192 25 7.38 8.51 3910 1082 34.9 136 13 4.05 4.67 2150 1603 57.3 518 11 6.65 6.92 3180 2430 78.4 675 13 9.10 10.49 4820 1144 38.1 189 13 4.42 4.94 2270 3409 110 794 10 12.8 14.71 6760 355.9 11.9 18 9.0 1.38 1.54 706 992.3 32.0 220 5.9 3.71 4.28 1970 1372 44.3 462 11 5.14 5.92 2720 2461 82.0 520 16 9.51 10.62 4880 CAL YR 1984 WTR YR 1985 TOTAL TOTAL 22623.9 25114.2 MEAN MEAN 61.8 68.8 MAX MAX 738 794 MIN MIN 4.4 5.9 CFSM CFSM 7.17 7.98 IN. IN. 97.63 108.38 AC-FT AC-FT 44870 49810 RIO ESPIRITU SANTO BASIN 187 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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLT- SPE- DIS- DEMAND, FORM, STREAM- CIFIC SOLVED CHEM- FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 INSTAN- DUCT- (STAND- TEMPER- BID- DIE- CENT (HIGH UM-MF DATE TIME TANEOUS MICE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) OCT 1984 24... 1330 28 95 7.50 25.5 3.9 7.6 92 22 K22000 JAN 1985 18... 1410 20 126 7.60 22.5 30 9.3 106 22 280 MAR 12... 1400 36 101 7.40 24.5 3.0 9.0 106 13 K15000 MAY 17... 1000 94 69 6.80 22.5 6.5 9.0 103 <10 4500 AUG 06... 1425 16 143 7.60 28.5 2.0 7.8 99 <10 7500 STREP- HARD- ALKA- TOCOCCI NESS MAGNE- SODIUM POTAS- LINITY FECAL, HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER KF AGAR NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE (COLS. (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL DATE PER AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L 100 ML) CAC03) CACO3 AS CA) AS MG) AS NA) AS K) CACO3 AS S) OCT 1984 24... 130 27 5.8 3.1 7.0 0.6 0.3 30 JAN 1985 18... 40 8.6 4.6 8.6 0.6 0.3 43 <0.5 MAR 12... 6000 34 MAY 17... 3100 17 1 3.5 1.9 5.5 0.6 0.4 16 <0.5 AUG 06... 850 31 SOLIDS, SOLIDS, CHLO- FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- SULFATE RIDE, RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, DIS- DIE- DIS- SOLVED TUENTS, SOLVED DEG. C, NITRITE NO2+NO3 AMMONIA SOLVED SOLVED SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL DATE (MG/L (MG/L (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L AS SO4) AS CL) AS F) 3IO2) (MG/L) DAY) (MG/L) AS N) AS N) AS N) OCT 1984 24... 2.1 10 <0.1 16 62 4.7 <1 0.01 <0.10 0.02 JAN 1985 18... 2.1 9.6 <0.1 22 82 4.4 <1 <0.01 <0.10 <0.01 MAR 12... 6 <0.01 <0.10 0.05 MAY 17... 2.6 7.9 <0.1 11 42 11 7 <0.01 <0.10 0.09 AUG 06... 3 <0.01 <0.10 0.07 NITRO- CHRO- NITRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, IRON, GEN, MONIA + PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC ORGANIC PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) AS FE) OCT 1984 24... 0.48 0.5 <0.01 JAN 1985 18... 0.6 <0.01 <1 <100 <20 1 <1 <10 220 MAR 12... 0.55 0.6 <0.01 MAY 17... 0.61 0.7 <0.01 <1 <100 <20 1 <1 <10 500 AUG 06... 0.33 0.4 0.03 K = non-ideal count 188 RIO ESPIRITU SANTO BASIN 50063800 RIO ESPIRITU SANTO NEAR RIO GRANDE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- LEAD, NESE, MERCURY SILVER, ZINC, LEER TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CH) (UG/L) (MG/L) OCT 1984 24. JAN 1985 18... 2 30 <0.1 (1 <1 20 <0.01 4 0.01 MAR 12... <0.1 -- MAY 17... 3 10 <0.1 <1 <1 <10 <0.01 7 0.03 AUG 06... I I I I I I RIO MAMEYES BASIN 189 50065500 RIO MAMEYES NEAR SABANA, PR LOCATION.--Lat 18°19'46", long 65045'04", on left bank, at bridge on Highway 988, 1.4 i (2.3 ka) west of Sabana, 2.0 i (3.2 km) downstream from Rio de la Mina, and 3.2 mi (5.1 km) southeast of Mameyes. DRAINAGE AREA.--6.88 sq i (17.82 sq km). 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 ), from topographic map. REMARKS.--Estimated daily discharges: Oct. 20 to Nov. 20 and Jan. 28 to Feb. 12. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--8 years (1968-73, 1984-85), 57.8 cu ft/s (1.637 cu a/s), 114.09 in/yr (2,898 ma/yr), 41,880 acre-ft/yr (51.6 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 19,800 cu ft/a (561 cu m/s), Sept. 4, 1973, gage height, 13.02 ft (3.968 a), fro rating curve extended above 1,800 cu ft/s (51.0 cu /s) on basis of slope-area measurement of peak flow; minimum discharge, 5.1 cu ft/s (0.144 cu a/a), Apr. 8, 9, 1970. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,000 cu ft/s (113 cu m/s) and maximum (11): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (a) Date Time (cu ft/s) (cu a/s)• (ft) (a) May 14 1445 10,100 286 10.25 3.124 May 17 2245 *13,900 394 *11.44 3.487 Minimum discharge, 8.0 cu ft/s (0.227 cu m/s), June 19. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 44 71 46 37 77 220 186 472 309 695 36 92 56 47 45 43 64 57 36 31 29 20 15 17 15 64 37 30 24 29 33 28 25 25 24 19 20 20 20 22 14 15 15 15 15 14 12 14 21 12 11 10 11 9.6 13 35 37 26 24 23 6 7 8 9 10 58 39 39 108 52 650 550 360 305 162 36 32 34 103 72 35 29 24 23 32 14 13 12 12 11 31 73 81 43 31 23 30 25 21 20 19 37 20 17 19 14 14 15 12 11 12 11 11 14 15 14 29 20 19 19 22 28 65 31 23 11 12 13 14 15 43 61 67 112 78 100 81 89 375 215 46 42 35 29 28 31 23 21 24 26 13 12 12 15 24 25 27 23 22 22 20 21 29 20 19 27 117 44 364 329 11 9.3 9.3 9.5 10 46 15 13 14 82 19 26 36 28 36 32 173 326 91 59 16 17 18 19 20 69 103 54 51 225 79 147 68 113 59 31 80 31 31 33 19 19 18 18 17 17 20 23 34 21 23 26 49 33 31 58 135 37 23 41 170 731 324 78 42 9.2 9.2 9.3 9.7 9.9 50 124 46 41 150 22 19 24 32 21 46 40 36 35 30 21 22 23 24 25 210 110 60 46 76 54 63 78 51 47 27 28 24 26 34 16 16 16 15 15 16 17 34 54 33 30 28 26 26 25 27 20 216 54 34 30 24 20 19 17 10 10 11 11 11 58 44 60 72 41 29 19 18 16 18 29 46 77 207 82 26 27 28 29 30 31 101 98 122 102 309 155 45 53 44 38 35 --- 40 55 37 29 95 94 21 20 18 16 17 15 38 147 221 --- 27 84 89 280 173 60 26 23 22 21 20 --- 19 14 14 15 14 14 11 37 12 11 11 --- 35 43 51 26 19 14 19 157 93 29 28 23 52 77 56 47 62 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 2823 91.1 309 37 13.2 15.26 5600 5743 191 695 35 27.8 31.05 11390 1428 46.1 103 24 6.70 7.72 2830 775 25.0 64 15 3.63 4.19 1540 909 32.5 221 11 4.72 4.91 1800 1572 50.7 280 22 7.37 8.50 3120 1120 37.3 216 19 5.42 6.06 2220 2639 85.1 731 14 12.4 14.27 5230 371.4 12.4 37 9.2 1.80 2.01 737 1180 38.1 150 11 5.54 6.38 2340 867.6 28.0 157 9.6 4.07 4.69 1720 1917 63.9 326 22 9.29 10.37 3800 CAL YR 1984 WTR YR 1985 TOTAL 21913 TOTAL 21345.0 MEAN MEAN 59.9 58.5 MAX MAX 695 731 MIN MIN 11 9.2 CFSM CFSM 8.71 8.50 IN. IN. 118.48 115.41 AC-FT AC-FT 43460 42340 190 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 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TUBE (CFS) (UMHOS) (DEG C) (CFS) (UMEOS) (DEG C) FEB, 13 1245 12 121 21.5 SEP, 12 1137 30 94 23.5 I I I I I 191 RIO MAMEYES BASIN 50065700 RIO MAMEYES AT HIGHWAY 191 AT MAMEYES, PR LOCATION.--Lat 18°22'03", long 65°46'14", Hydrologic Unit 21010006, on left bank, 0.2 i (0.3 ka) upstream from Quebrada Anon, 0.3 mi (0.5 km) downstream from Quebrada Tabonuco, and 0.3 mi (0.5 km) south of Mameyes. DRAINAGE AREA.--11.8 aq mi (30.6 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1966 to January 1985 (discontinued). GAGE.--Water-stage recorder. Elevation of gage is 22 ft (7 ), fro topographic map. Prior to Jan. 1, 1974 at datum 4.88 ft (1.487 ) higher and Jan. 1, 1974 to Mar. 25, 1976 at datum 4.00 ft (1.219 a) higher. REMARKS.--No estimated daily discharges during period of record. Records fair. AVERAGE DISCHARGE.--18 years (1967-84), 72.6 cu ft/s (2.056 cu m/s), 83.55 in/yr (2,122 mm/yr), 52,600 acre-ft/yr (64.8 cu hm/yr); median of yearly mean discharges, 71 cu ft/s (2.01 cu m/s), 51,400 acre-ft/yr (63 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 26,200 cu ft/s (742 cu /s), Oct. 24, 1974, gage height, 18.79 ft (5.727 a), present datum, from rating curve extended above 200 cu ft/s (5.66 cu m/s) on basis of slope-area measurement of peak flow; minimum discharge, 5.0 ou ft/s (0.142 cu m/s), Apr. 28, 1975. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 5,300 cu ft/s (150 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Oct. 30 1300 *3,500 99.1 *11.14 3.395 Minimum discharge, 17 cu ft/s (0.481 cu m/s), Oct. 4, 5. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 33 273 36 59 2 87 231 187 97 3 30 597 79 87 4 20 387 55 54 5 98 882 52 44 6 60 824 43 49 7 24 689 37 43 8 22 453 37 31 9 165 385 178 28 10 48 202 117 68 11 34 123 55 46 12 42 101 53 28 13 46 109 43 22 14 240 473 34 22 15 218 269 32 32 16 120 97 35 20 17 164 182 117 19 18 95 84 35 18 19 76 141 36 20 20 285 102 45 20 21 266 72 34 21 22 138 72 36 19 23 73 109 31 19 24 55 59 34 19 25 91 51 44 --- 26 125 50 50 27 121 83 72 28 152 46 51 29 126 39 36 30 387 36 174 31 194 --- 150 TOTAL 3635 7221 2018 MEAN 117 241 65.1 MAX 387 882 187 MIN 20 36 31 CFSM 9.92 20.4 5.52 IN. 11.46 22.76 6.36 AC-FT 7210 14320 4000 CAL YR 1984 TOTAL 30264.8 MEAN 82.7 MAX 882 MIN 9.0 CFSM 7.01 IN. 95.41 AC-FT 60030 192 RIO MAMEYES BASIN 50065700 RIO MAMEYES AT HIGHWAY 191 AT MAMEYES, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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) JAN, 24 1204 9.6 150 2200 I I I 193 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 sq i (10.26 aq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1979 to current year. GAGE.--Water-stage recorder. Elevation of gage is 260 ft (80 10, from topographic map. REMARKS.--Estimated daily discharges: Mar. 19 to Apr. 13. Records fair except, those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--6 years (1980-85), 17.7 cu ft/s (0.501 cu /s), 60.70 in/yr (1,542 mm/yr), 12,820 acre-ft/yr (15.8 cu ha/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,010 cu ft/s (255 cu m/s), Apr. 21, 1983, gage height, 19.35 ft (5.898 m), from floodmark, from rating curve extended above 200 cu ft/a (5.66 cu m/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 0.86 cu ft/s (0.024 cu m/s), Apr. 17, 1983. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,600 ou ft/a (42.5 cu /c) and maximum (*); Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (a) Date Time (Cu ft/a) (ou m/s) (ft) (a) May 16 0400 1,890 53.5 12.74 3.883 May 17 *0930 *3,470 98.3 *14.73 4.490 Minimum discharge, 1.1 cu ft/s (0.031 cu m/s), Aug. 10-12, 25, 26. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 10 17 14 5.0 50 37 33 154 68 324 14 36 19 15 15 13 15 14 12 9 9 5.5 3.8 3.0 3.1 2.9 20 7.4 4.6 3.6 4.0 11 8.0 6.6 5.8 5.0 2.0 2.1 2.3 2.3 2.4 9.3 8.5 8.0 7.9 8.6 2.3 2.2 2.3 1.9 1.8 1.4 1.3 1.4 1.2 1.4 3.0 3.3 1.7 1.4 1.3 6 7 8 9 10 26 9.0 7.0 94 22 239 182 76 89 46 13 12 13 43 24 12 11 8.0 7.6 13 2.8 2.5 2.5 2.4 2.2 7.5 19 28 14 9.5 4.7 10 8.2 4.5 3.9 2.3 29 6.8 2.6 2.6 8.6 7.8 7.5 6.8 7.1 1.5 1.5 1.5 1.4 1.4 1.5 1.8 6.7 1.5 1.2 1.2 4.9 17 5.4 2.1 11 12 13 14 15 14 11 13 70 78 38 34 34 127 54 13 16 13 10 9.4 10 7.6 6.6 6.6 6.7 2.5 2.5 2.5 2.5 3.7 4.8 5.8 4.4 3.5 4.0 5.0 3.9 5.8 4.7 4.0 2.8 28 12 13 81 6.4 5.4 5.8 4.6 4.1 7.0 2.5 1.3 1.8 18 1.2 1.6 4.9 4.3 5.9 6.7 91 217 32 14 16 17 18 19 20 32 23 16 14 87 30 34 26 35 27 10 21 9.9 8.2 7.6 5.8 5.8 5.6 4.7 4.4 2.7 2.5 2.7 5.3 3.2 3.6 3.7 14 3.2 2.3 4.5 79 16 5.1 7.6 157 407 257 48 31 3.4 2.8 2.7 2.6 2.4 9.3 31 2.8 1.8 46 1.9 1.3 1.6 3.5 1.6 9.9 7.6 5.5 4.8 6.1 21 22 23 24 25 83 23 16 14 16 22 21 23 19 19 7.0 6.6 6.0 7.1 6.9 4.3 4.3 4.2 4.1 3.8 2.3 2.5 2.6 5.3 2.5 2.0 2.0 1.9 1.6 1.5 5.1 2.5 86 16 5.9 25 22 19 18 16 2.2 2.1 2.0 2.7 3.2 9.5 2.6 2.2 4.6 2.1 2.1 1.4 1.2 1.3 1.2 3.9 3.4 8.8 54 118 26 27 28 29 30 31 16 17 19 15 45 19 18 29 18 15 14 --- 6.7 8.6 5.9 5.3 30 28 4.6 4.2 3.8 3.5 3.5 3.2 4.0 47 108 --- 2.3 8.5 17 125 50 30 3.6 2.8 2.5 2.3 2.3 --- 14 13 13 12 11 10 1.9 1.6 1.7 1.6 1.7 --- 1.5 1.4 16 11 2.9 1.9 1.5 91 42 4.7 2.5 1.9 20 11 11 9.5 8.9 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 895.0 28.9 94 5.0 7.30 8.41 1780 1885 62.8 324 14 15.9 17.71 3740 440.2 14.2 43 5.3 3.59 4.14 873 222.7 7.18 15 3.2 1.81 2.09 442 235.0 8.39 108 2.2 2.12 2.21 466 408.7 13.2 125 1.5 3.33 3.84 811 332.3 11.1 86 2.3 2.80 3.12 659 1264.2 40.8 407 2.0 10.3 11.88 2510 141.0 4.70 9.3 1.6 1.19 1.32 280 195.0 6.29 46 1.3 1.59 1.83 387 198.0 6.39 91 1.2 1.61 1.86 393 684.4 22.8 217 1.2 5.76 6.43 1360 CAL YR 1984 WTR YR 1985 TOTAL TOTAL 6208.6 6901.5 MEAN MEAN 17.0 18.9 MAX MAX 324 407 MIN MIN 1.4 1.2 CFSM CFSM 4.29 4.77 IN. IN. 58.32 64.83 AC-FT AC-FT 12310 13690 194 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 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TUBE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) FEB, 13 1005 2.9 148 22.6 SEP, 12 1335 5.5 117 25.0 I I I I I I I I I 195 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 (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 sq i (38.6 sq km). 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 ) 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 ); 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 a). REMARKS.--No estimated daily discharges during water year. Records fair. Low flow affected by diversions for water supply (approximately 9.0 cu ft/s (0. 255 cu /s). AVERAGE DISCHARGE.--24 years (1962-85), 67.7 cu ft/s (1.917 cu m/s), 61.70 in/yr (1,567 ma/yr), 49,050 acre-ft/yr (60.5 cu hm/yr); median of yearly mean discharges, 68 ou ft/s (1.93 cu /s), 49,300 acre-ft/yr (62 cu ha/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 19,600 cu ft/s (565 cu m/s), Oct. 24, 1974, gage height, 13.62 ft (4.151 a), datum then in use, fro rating curve extended above 100 cu ft/s (2.83 cu m/s) on basis of step-backwater analyses and slope-area measurements of peak discharges; minimum discharge, 0.86 cu ft/s (0.024 cu /s), May 3, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,500 cu ft/s (99.1 cu /a) and maximum (s): Discharge Gage height Discharge Gage height Date Time (cu ft/a) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Oct. 16 1545 3,600 102 7.93 2.417 May 17 2345 *6,000 170 *9.88 3.011 Minimum discharge, 3.4 ou ft/s (0.096 cu /s), July 10, 11. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 25 103 28 108 15 82 41 12 17 6.8 18 22 2 56 123 102 170 12 23 29 11 16 13 12 17 3 24 398 74 77 10 16 24 15 15 9.1 11 16 4 15 222 49 43 9.9 12 21 14 14 18 7.2 12 5 25 939 45 31 9.1 41 18 12 13 9.5 5.5 9.9 6 42 850 34 55 8.2 22 17 15 13 6.2 7.3 9.1 7 89 695 29 37 7.8 80 38 15 13 5.5 12 10 8 34 284 32 26 7.4 93 30 15 13 5.0 20 135 9 361 312 203 22 7.5 46 16 20 12 5.8 7.1 39 10 74 157 117 38 7.2 24 14 13 14 4.3 5.3 16 11 40 107 44 31 24 16 18 12 13 41 4.6 17 12 51 89 39 22 11 14 14 83 11 11 5.3 255 13 37 96 31 20 9.6 12 21 35 10 8.7 25 686 14 231 564 27 19 13 11 14 193 9.3 6.4 16 150 15 237 213 25 22 20 9.2 15 262 8.9 66 16 66 16 349 89 29 17 12 9.5 63 403 8.6 51 8.6 43 17 134 129 91 16 15 12 224 1300 8.2 91 5.7 34 18 69 75 29 16 25 26 57 951 8.2 20 7.3 28 19 50 140 26 15 49 11 26 160 8.2 13 17 25 20 243 93 27 14 19 8.0 34 85 7.9 180 7.7 24 21 238 61 22 13 11 7.0 25 60 7.3 40 19 20 22 76 58 24 13 13 7.0 15 48 7.9 19 8.2 19 23 47 67 21 13 16 6.8 173 40 7.3 16 5.8 25 24 35 47 21 12 34 5.7 90 35 7.0 27 5.2 175 25 50 46 43 11 16 5.1 34 32 7.3 15 4.5 225 26 46 47 34 16 12 8.3 22 28 7.0 12 4.7 59 27 57 39 41 14 142 31 18 25 6.2 11 340 38 28 65 36 29 12 249 62 14 23 5.7 42 150 85 29 57 32 22 10 --- 476 13 21 5.5 30 33 46 30 83 30 88 10 190 13 20 5.7 20 24 33 31 49 --- 78 9.9 111 --- 18 --- 14 19 --- TOTAL 2989 6141 1504 932.9 784.7 1477.6 1151 3976 300.2 817.3 832.0 2339.0 MEAN 96.4 205 48.5 30.1 28.0 47.7 38.4 128 10.0 26.4 26.8 78.0 MAX 361 939 203 170 249 476 224 1300 17 180 340 686 MIN 15 30 21 9.9 7.2 5.1 13 11 5.5 4.3 4.5 9.1 CFSM 6.47 13.8 3.26 2.02 1.88 3.20 2.58 8.59 .67 1.77 1.80 5.23 IN. 7.46 15.33 3.75 2.33 1.96 3.69 2.87 9.93 .75 2.04 2.08 5.84 AC-FT 5930 12180 2980 1850 1560 2930 2280 7890 595 1620 1650 4640 CAL YR 1984 TOTAL 21817.2 MEAN 59.6 MAX 939 MIN 1.0 CFSM 4.00 IN. 54.47 AC-FT 43270 WTR YR 1985 TOTAL 23244.7 MEAN 63.7 MAX 1300 MIN 4.3 CFSM 4.28 IN. 58.03 AC-FT 46110 I RIO FAJARDO BASIN J.96 50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1960 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: October 1982 to current year. INSTRUMENTATION.--Automatic sediment sampler removed on September 1985. USD-49 Sediment sampler since Febru- ary 1983. REMARKS.--Automatic sediment sampler set to collect samples above a streamflow of 100 ft3/sec. In addition to automatic sediment sampler, 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. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATIONS: Maximum daily mean, 1,820 mg/L May 17, 1985; Minimum daily mean, 0.0 mg/L May 9, 1983. SEDIMENT LOADS: Maximum daily, 19,800 tons (17,960 tonnes) April 21, 1983; minimum daily, 0.0 tons (0.0 tonne) May 9, 1983. EXTREMES FOR CURRENT YEAR.-- SEDIMENT CONCENTRATION: Maximum daily mean 1,820 mg/L May 17; Minimum daily mean, 1.0 g/L several days. SEDIMENT LOADS: Maximum daily, 13,700 tons (12,500 tonnes) May 17; minimum daily, 0.03 tons (0.03 tonne) several days. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 01... 1215 86 91 7.40 26.0 7.6 8.0 98 15 K1000 K180 JAN 1985 08... 1225 25 126 7.80 25.0 10.2 123 10 240 130 MAR 29... 1220 172 316 6.80 23.0 15 8.3 96 14 4000 4100 MAY 16... 1125 188 65 6.80 24.0 13 8.6 102 <10 4200 7200 AUG 05... 1130 5.7 127 7.80 28.5 1.9 9.7 123 <10 48 54 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 1984 01... JAN 1985 08... MAR 29... MAY 16... AUG 05... 23 5.0 2.5 7.7 0.7 0.9 25 3.8 9.5 37 <0.5 14 15 2 3.2 1.6 5.8 0.7 1.3 13 <0.5 4.5 7.8 38 K . non-ideal count RIO FAJARDO BASIN 197 50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 SOLIDS, SOLIDS, NITRO- FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (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) AS N) NOV 1984 01... <0.1 18 62 14 8 <0.01 0.20 0.25 0.25 0.5 JAN 1985 08... <0.01 0.20 <0.01 0.4 MAR 29... 16 0.28 0.02 0.30 0.05 0.45 0.5 MAY 16... <0.1 11 43 22 21 0.39 0.01 0.40 0.24 0.36 0.6 AUG 05... 0.89 <0.01 0.10 0.05 0.15 0.2 CHRO- BARIUM, BORON, CADMIUM MIUM, COPPER, IRON, LEAD, NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) AS FE) AS PB) NOV 1984 01... 0.7 3.1 0.03 JAN 1985 08... 0.6 2.7 <0.01 <20 <10 480 MAR 29... 0.8 3.5 <0.01 MAY 16... 1.0 4.4 <0.01 <1 <100 <20 1 <1 10 2200 2 AUG 05... 0.3 1.3 0.02 MANGA- METHY- SEDI- NESE, MERCURY SILVER, ZINC, LENS MENT, TOTAL TOTAL SELE- TOTAL TOTAL BLUE SEDI- DIS- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE MENT, CHARGE, ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- SUS- SUS- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE PENDED PENDED AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) (MG/L) (T/DAY) JAN 1985 08... 20 30 <0.01 5 0.03 MAR 29... <0.1 MAY 16... 50 <0.1 <1 <1 20 <0.01 46 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 1455 54.5 110 26.0 SEP, 03 1416 14.5 120 31.5 198 RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 CHLOR- DI- DI- PCB, ALDRIN, DANE, DDD, DDB, 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) AUG 1985 05... 1130 <.1 <.01 <.1 <.01 <.01 <.01 <.01 <.01 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) AUG 1985 05... <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.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) AUG 1985 05... <.01 <.01 <.01 <.01 (.1 <.1 < 1 <.01 SED. SED. SED. SED. SED. BED. BED. SED. SED. SED. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SEDI- FALL FALL FALL FALL FALL SIEVE SIEVE SIEVE SIEVE SIEVE MENT, DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. SUS- % FINER % FINER % FINER % FINER % FINER % FINER % FINER % FINER % FINER % FINER DATE TIME PENDED THAN THAN THAN THAN THAN THAN THAN THAN THAN THAN (1443/L) .002 MM .004 MM .008 MM .016 MM .031 MM .062 MM .125 MM .250 MM .500 MM 1.00 MM OCT 1984 09... 12:45 3070 18 29 39 60 73 80 90 95 98 99 09... 13:00 3880 12 23 34 68 74 80 90 90 99 99 09... 13:15 4130 20 21 32 51 71 79 90 97 99 99 09... 13:30 2820 9 17 28 44 65 70 89 96 98 99 20... 20:45 850 38 41 44 46 48 59 70 83 94 99 20... 23:45 1380 34 40 48 55 66 80 92 96 98 99 NOV 03... 04:30 633 31 42 53 63 72 82 88 95 99 99 14... 14:30 1210 16 25 37 52 70 90 96 99 99 100 14... 15:30 16 16 24 34 51 70 89 95 99 99 100 MAY 1985 17... 05:30 5270 0 15 24 35 48 70 85 98 99 100 17... 08:00 3610 11 18 29 41 54 60 75 91 98 99 199 RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 25 10 .73 103 39 22 28 5 .47 2 56 25 7.3 123 56 26 102 51 27 3 24 7 .37 398 368 815 74 38 11 4 15 5 .19 222 130 58 49 31 5.8 5 25 12 .94 939 990 3550 45 18 2.9 6 42 19 3.0 850 918 3640 34 5 .58 7 89 104 57 695 536 1510 29 5 .51 8 34 34 2.8 284 104 97 32 9 1.0 9 361 369 1350 312 221 349 203 250 409 10 74 37 7.4 157 47 40 117 120 55 11 40 14 1.7 107 28 9.5 44 15 2.0 12 51 18 2.9 89 28 7.9 39 10 1.2 13 37 16 1.8 96 34 11 31 8 .82 14 231 292 587 564 696 3410 27 7 .49 15 237 290 646 213 85 70 25 6 .47 16 349 741 4080 89 30 23 29 6 .52 17 134 84 52 129 48 23 91 44 16 18 69 68 15 75 15 3.7 29 20 1.8 19 50 32 4.9 140 62 46 26 5 .39 20 243 146 181 93 10 3.0 27 10 .81 21 238 168 213 61 8 1.6 22 10 .68 22 76 10 2.5 58 5 .99 24 5 .36 23 47 5 .78 67 5 1.0 21 5 .32 24 35 5 .59 47 5 .78 21 6 .37 25 50 20 3.3 46 5 .74 43 17 2.5 26 46 15 3.8 47 5 .78 34 13 1.5 27 57 25 4.6 39 5 .63 41 17 2.3 28 65 38 10 36 5 .63 29 5 .43 29 57 22 5.5 32 5 .54 22 5 .35 30 83 67 52 30 5 .51 88 123 36 31 49 32 9.7 --- --- 78 43 13 TOTAL 2989 7307.80 6141 13721.30 1504 595.57 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 1 108 84 68 15 7 .26 82 28 8.9 2 170 210 208 12 6 .16 23 10 .78 3 77 37 8.6 10 15 .35 16 6 .34 4 43 16 2.0 9.9 6 .12 12 7 .34 5 31 13 1.2 9.1 6 .11 41 38 9.6 6 55 22 3.6 8.2 10 .18 22 12 1.0 7 37 14 1.4 7.8 5 .09 80 49 31 8 26 13 .88 7.4 5 .09 93 50 18 9 22 12 .75 7.5 3 .04 46 25 3.6 10 38 13 1.3 7.2 4 .06 24 12 1.1 11 31 13 1.0 24 12 .62 16 10 .59 12 22 12 .75 11 4 .11 14 10 .51 13 20 8 .41 9.6 8 .18 12 10 .49 14 19 7 .34 13 10 .30 11 6 .24 15 22 10 .57 20 10 .51 9.2 5 .18 16 17 15 .65 12 5 .14 9.5 5 .18 17 16 10 .41 15 5 .19 12 5 .24 18 16 10 .41 25 8 .53 26 17 1.8 19 15 10 .38 49 19 3.2 11 5 .22 20 14 6 .21 19 10 .41 8.0 4 .12 21 13 20 .65 11 6 .15 7.0 5 .14 22 13 10 .30 13 4 .12 7.0 8 .22 23 13 10 .30 16 7 .35 6.8 6 .15 24 12 15 .41 34 10 .78 5.7 6 .13 25 11 10 .27 16 12 .42 5.1 5 .10 26 16 5 .20 12 5 .18 8.3 5 .14 27 14 5 .16 142 80 42 31 19 2.9 28 12 5 .14 249 250 296 62 261 621 29 10 5 .14 --- --- 476 477 1290 30 10 5 .14 190 279 451 31 9.9 8 .18 111 33 13 TOTAL 932.9 303.75 784.7 347.65 1477.6 2458.01 200 RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 41 5 .50 12 10 .30 17 8 .39 2 29 6 .42 11 10 .27 16 8 .35 3 24 6 .26 15 10 .32 15 5 .20 4 21 6 .26 14 6 .19 14 5 .20 5 18 6 .26 12 5 .16 13 6 .23 6 17 6 .24 15 5 .19 13 6 .21 7 38 14 2.2 15 6 .30 13 6 .21 8 30 5 .34 15 12 .44 13 3 .11 9 16 5 .20 20 12 .49 12 2 .06 10 14 5 .16 13 6 .19 14 3 .11 11 18 5 .19 12 6 .18 13 3 .11 12 14 5 .16 83 68 25 11 2 .06 13 21 5 .24 35 13 1.3 10 2 .05 14 14 5 .16 193 369 460 9.3 2 .05 15 15 5 .16 262 380 572 8.9 2 .05 16 63 29 8.5 403 357 1500 8.6 2 .05 17 224 327 434 1300 1820 13700 8.2 2 .04 18 57 13 2.0 951 1720 9900 8.2 2 .04 19 26 5 .32 160 25 24 8.2 2 .04 20 34 5 .45 85 17 3.9 7.9 2 .04 21 25 5 .30 60 10 1.6 7.3 2 .04 22 15 5 .20 48 8 1.1 7.9 2 .04 23 173 136 158 40 6 .70 7.3 2 .04 24 90 58 21 35 8 .80 7.0 3 .06 25 34 15 1.2 32 10 .92 7.3 2 .04 26 22 8 .41 28 8 .63 7.0 3 .06 27 18 10 .43 25 5 .35 6.2 3 .05 28 14 5 .18 23 5 .34 5.7 3 .05 29 13 5 .16 21 5 .31 5.5 3 .04 30 13 5 .16 20 5 .28 5.7 2 .03 31 --- --- --- 18 5 .26 --- --- --- TOTAL 1151 633.06 3978 26196.52 300.2 3.05 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 6.8 3 .06 18 10 .40 22 10 .51 2 13 6 .18 12 10 .32 17 10 .41 3 9.1 6 .13 11 5 .16 16 9 .32 4 18 6 .24 7.2 2 .04 12 10 .27 5 9.5 8 .18 5.5 2 .04 9.9 8 .20 6 6.2 7 .11 7.3 2 .05 9.1 8 .18 7 5.5 6 .07 12 4 .22 10 8 .18 8 5.0 5 .06 20 20 1.1 135 70 31 9 5.8 4 .05 7.1 8 .16 39 12 1.1 10 4.3 3 .03 5.3 5 .09 16 10 .38 11 41 15 3.0 4.6 6 .09 17 10 .41 12 11 8 .20 5.3 4 .07 255 522 1400 13 8.7 8 .16 25 13 1.1 686 708 1940 14 6.4 8 .12 16 a .39 160 30 12 15 66 79 27 16 6 .32 66 9 1.3 16 51 38 7.4 8.6 2 .05 43 8 .82 17 91 77 46 5.7 3 .06 34 2 .16 18 20 10 .49 7.4 4 .10 28 2 .13 19 13 10 .32 17 11 .64 25 2 .11 20 180 143 167 7.7 8 .20 24 3 .15 21 40 8 .80 19 8 .43 20 1 .04 22 19 8 .37 8.2 3 .08 19 1 .04 23 16 7 .26 5.8 3 .06 25 4 .23 24 27 8 .59 5.2 3 .05 175 128 80 25 15 4 .13 4.5 2 .03 225 267 327 26 12 3 .08 4.7 2 .03 59 17 2.3 27 11 2 .05 340 385 746 38 10 .78 28 42 24 4.7 150 81 140 85 49 25 29 30 11 .74 33 40 2.9 46 13 1.3 30 20 6 .29 24 15 .89 33 10 .57 31 14 8 .26 19 10 .43 --- --- --- TOTAL 817.3 261.07 832.1 896.50 2339.0 3826.89 YEAR 23244.8 56551.17 I RIO FAJARDO BASIN 50072500 RIO FAJARDO BELOW FAJARDO, PR WATER-QUALITY RECORDS 201 LOCATION.--Lat 18°19'35", long 65°38'47", 1.2 i (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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIE- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 19... 1015 90 148 7.40 26.5 5.1 7.8 96 13 370 K100 JAN 1985 18... 1020 26 208 7.20 23.0 75 9.0 104 28 2200 MAR 15... 1050 17 210 7.30 25.0 80 7.6 91 <10 K9800 900 MAY 22... 1450 42 181 7.30 28.5 4.5 8.7 110 K74000 2400° AUG 06... 1050 10 211 7.20 29.0 5.4 7.1 92 12 38000 550 HARD- AI.KA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIE- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIE- (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 H) CAC03 AS 8) AS SO4) AS CL) NOV 1984 19... 42 1 9.7 4.3 12 0.8 1.3 41 5.5 19 JAN 1985 18... 57 6 14 5.4 17 1 1.0 51 <0.5 5.9 27 MAR 15... 51 MAY 22... 51 10 13 4.6 15 0.9 1.4 41 <0.5 6.9 29 AUG 06... 41 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIE- 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 1984 19... <0.1 25 100 25 4 0.29 0.01 0.30 0.14 0.06 JAN 1985 18... 0.2 21 120 8.6 17 <0.01 0.10 0.05 0.75 MAR 15... 47 0.17 0.03 0.20 0.23 0.17 MAY 22... <0.1 23 120 '13 12 <0.01 0.30 0.22 0.08 AUG 06... 10 0.17 0.03 0.20 0.22 0.28 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 1984 19... 0.2 0.5 2.2 <0.01 JAN 1985 18... 0.8 0.9 4.0 0.08 <1 100 <20 2 <1 <10 MAR 15... 0.4 0.6 2.7 0.07 MAY 22... 0.3 0.6 2.7 0.01 <1 <100 <20 1 <1 <10 AUG 06... 0.5 0.7 3.1 0.10 K = non-ideal count RIO FAJARDO BASIN 202 60072600 RIO FAJARDO BELOW FAJARDO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1984 19... JAN 1985 18... 2100 1 150 0.2 <1 <1 20 <0.01 11 0.02 MAR 15... 0.2 MAY 22... 830 3 150 0.3 <1 <1 <10 <0.01 7 0.03 AUG 06... I I I I I I 203 RIO BLANCO BASIN 50075000 RIO ICACOS NEAR NAGUABO, PR LOCATION.--Lat 18°16'38", long 65047'09", Hydrologic Unit 21010001, in Caribbean National Forest, off Highway 191, at El Yunque, 1.6 mi (2.6 ka) upstream fro confluence with Rio Cubuy, 2.8 i (4.5 km) north of Florida, and 5.3 mi (8.5 km) northwest of Naguabo Plaza. DRAINAGE AREA.--1.26 sq mi (3.26 sq km). 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 and sharp-created weir. Elevation of gage is 2,020 ft (616 a), fro topographic map. REMARKS.--Estimated daily discharges: Oct. 17-19, Nov. 1-19. Records poor. AVERAGE DISCHARGE.--13 years (1946-52, 1980-85), 15.2 cu ft/s (0.430 cu m/s), 163.82 in/yr (4,161 mm/yr), 11,010 acre-ft/yr (13.6 cu hm/yr); median of yearly mean discharges, 14 ou ft/s (0.40 cu m/s), 10,100 acre-ft/yr (12 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,860 cu ft/s (81.0 cu m/s), Apr. 21, 1983, gage height, 8.96 ft (2.731 a), fro rating curve extended above 30 cu ft/s (0.850 cu /s) on basis of step-backwater analysis; minimum daily discharge, 1.5 cu ft/s (0.042 cu m/s), Mar. 22, Apr. 10, 1946. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 650 cu ft/s (18.4 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/a) (ou a/a) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Mar. 28 2315 *1,000 28.3 *6.19 1.887 May 17 2245 864 24.5 5.87 1.789 May 14 1500 958 27.1 6.09 1.856 Minimum discharge, 3.6 cu ft/s (0.102 cu /s), July 13, 14, 15. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 7.1 29 11 13 6.3 13 8.6 6.0 6.5 4.2 7.0 11 2 12 35 37 22 5.3 7.9 7.6 7.2 6.3 4.3 5.8 9.0 3 6.6 58 15 20 5.2 7.8 7.1 6.4 6.1 4.5 5.7 7.1 4 6.2 35 18 11 6.2 6.5 6.8 6.1 6.1 6.4 5.4 6.4 5 13 91 13 8.5 5.0 12 6.6 7.0 6.0 4.3 6.1 8.1 6 9.4 102 11 12 4.9 9.1 6.6 6.1 6.0 4.1 5.8 6.2 7 7.4 79 9.7 8.4 4.8 28 9.8 7.3 5.8 4.0 12 6.4 8 6.9 53 10 7.6 4.8 20 7.3 6.3 5.8 6.0 7.2 36 9 36 33 33 7.3 4.8 9.6 7.4 8.0 5.6 4.5 5.6 9.3 10 18 21 16 10 8.1 8.4 6.8 6.7 5.9 4.0 5.3 7.6 11 9.3 15 13 9.7 7.1 7.0 7.7 6.5 5.6 4.5 5.2 10 12 8.6 17 10 7.2 5.3 7.1 7.8 27 5.5 4.5 6.2 37 13 15 17 9.2 6.8 4.8 6.4 9.7 8.2 5.5 3.7 9.4 83 14 30 93 8.8 12 6.6 6.3 6.9 124 5.4 3.9 6.2 13 15 14 28 8.7 7.9 8.4 6.1 7.5 84 5.2 22 9.3 10 16 8.3 14 9.3 6.5 5.1 6.6 27 24 5.1 12 5.7 9.2 17 17 24 26 6.4 7.1 6.2 25 112 4.8 31 5.3 8.8 18 12 13 8.9 6.2 8.0 10 10 75 4.8 5.8 8.3 8.3 19 7.9 23 10 6.0 18 6.2 8.0 13 4.8 13 6.9 8.0 20 53 14 9.1 6.0 7.0 6.1 20 11 4.8 46 9.1 7.9 21 30 14 8.1 5.9 6.1 5.9 8.6 9.6 4.7 11 10 7.6 22 13 15 9.2 5.6 5.7 5.9 7.2 9.2 4.6 6.8 6.1 7.4 23 9.9 17 7.7 5.6 19 5.7 39 8.6 4.6 6.6 6.6 9.6 24 8.3 13 8.3 5.6 15 5.6 10 8.3 4.6 10 5.3 24 25 18 12 10 5.7 12 5.5 7.8 8.0 4.6 6.3 5.2 68 26 16 12 10 5.8 8.7 5.9 7.2 7.8 4.4 6.1 8.3 13 27 15 12 19 6.0 42 40 6.8 7.4 4.2 5.6 53 10 28 26 11 11 5.5 81 65 6.5 7.4 4.1 9.5 14 27 29 19 11 9.7 5.1 --- 115 6.4 7.0 4.0 6.5 7.2 11 30 14 11 31 4.9 49 6.3 6.9 4.2 6.1 7.4 11 31 24 --- 28 4.8 13 --- 6.7 --- 5.5 7.8 --- TOTAL 490.9 922 438.7 255.0 321.3 506.8 309.7 638.7 155.6 272.7 267.4 488.9 MEAN 15.8 30.7 14.2 8.23 11.5 16.3 10.3 20.6 5.19 8.80 8.63 16.3 MAX 53 102 37 22 81 115 39 124 6.5 46 53 83 MIN 6.2 11 7.7 4.8 4.8 5.5 6.3 6.0 4.0 3.7 5.2 6.1 CFSM 12.5 24.4 11.3 6.53 9.13 12.9 8.17 16.3 4.12 6.98 6.85 12.9 IN. 14.49 27.22 12.95 7.53 9.49 14.96 9.14 18.86 4.59 8.05 7.89 14.43 AC-FT 974 1830 870 506 637 1010 614 1270 309 541 530 970 CAL YR 1984 TOTAL 4877.7 MEAN 13.3 MAX 102 MIN 4.0 CFSM 10.6 IN. 144.01 AC-FT 9670 WTR YR 1985 TOTAL 5067.7 MEAN 13.9 MAX 124 MIN 3.7 CFSM 11.0 IN. 149.62 AC-FT 10050 RIO BLANCO BASIN 204 50075000 RIO ICACOS NEAR NAGUABO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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) FEB, 14 0938 5.0 68 18.5 APR, 10 1106 6.3 19.5 MAR, 14 1146 6.2 62 19.0 SEP, 12 0900 9.0 60.4 21.0 I I I I I 205 RIO BLANCO BASIN 50076000 RIO BLANCO NEAR FLORIDA, PR LOCATION.--Lat 18°13'45", long 65°47'06", Hydrologic Unit 21010005, on left bank of Highway 191, 0.5 mi (0.8 km) upstream from Quebrada Sonadora, 0.7 i (1.1 km) upstream fro intersection of Highway 191 and 31, 0.8 mi (1.3 km) south of Florida. DRAINAGE AREA.--12.3 aq i (31.9 aq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1982 to January 1985 (discontinued). GAGE.--Water-stage recorder. Elevation of gage is 50 ft (15 ), from topographic map. REMARKS.--No estimated daily discharges during period of record. Records fair. Low flow affeoted by diversion for water supply. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 11,000 cu ft/s (312 cu m/s), Apr. 21, 1983, gage height, 22.76 ft (6.937 m) fro rating curve extended above 200 cu ft/s (5.664 cu m/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 8.8 cu ft/s (0.249 cu m/s), Apr. 10, 1983. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 cu ft/s (85.0 cu m/s) and maximum observed(*); Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Nov. 6 0515 *3,950 112 *16.59 5.057 Minimum discharge observed, 20 cu ft/s (0.566 cu m/s), Oct. 4, 5. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 24 163 38 156 2 47 183 183 199 3 27 458 83 106 4 21 270 74 60 5 40 670 56 43 6 42 881 46 88 7 26 547 41 49 8 31 240 43 38 9 320 283 152 35 10 145 138 93 48 11 72 91 52 46 12 60 85 45 34 13 65 83 37 31 14 356 345 35 39 15 100 206 34 36 16 103 81 42 26 17 97 149 128 25 18 51 79 40 25 19 37 124 43 24 20 179 88 41 24 21 133 61 35 23 22 77 62 43 22 23 47 70 34 22 24 37 53 37 21 25 108 53 72 21 26 62 55 66 27 87 45 110 28 140 43 72 29 117 41 43 30 63 39 146 31 54 --- 134 TOTAL 2768 5686 2098 MEAN 89.3 190 67.7 MAX 356 881 183 MIN 21 39 34 CFSM 7.26 15.4 5.50 IN. 8.37 17.20 6.35 AC-FT 5490 11280 4160 CAL YR 1984 TOTAL 24855 MEAN 67.9 MAX 881 MIN 14 CFSM 5.52 IN. 75.17 AC-FT 49300 206 RIO BLANCO BASIN 50076000 RIO BLANCO NEAR .FLORIDA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS OCTOBER 1982 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TUBE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) DEC, 04 1209 91 76 24.0 JAN, 25 1226 22 112 24.0 • • ..\\ Rib Anted.) Ruia basin 0 CAO Drainage boundary--\ 0820 Ho,G Rio Grande de Loizo basin Rib de la Plato basin r_- 08 at8 Island 0840 091950 Drainage boundary 0871 YAB •20 Lapa R(o Salinas (Nigua) basin ."../ a AT1LLA Ot 0945 EXPLANATION 0820 SURFACE—WATER STATION AND NUMBER ARROYO 0825 LOW—FLOW STATION AND NUMBER Nr 0835 QUALITY—OF—WATER STATION AND NUMBER CA R1BBE AN SE A 031 WELL AND WELL NUMBER Figure 22.--Southeastern river basins--Rio Humacao to Rio Seco basins. 1 2 3 4 5 KILOMETERS I I LI I 1 0 1 2 4 3 5 MILES • 208 RIO HUMACAO BASIN 50082000 RIO HUMACAO AT HIGHWAY 3 AT HUMACAO, PR LOCATION.--Lat 18°08'49", long 65°49'37", at bridge on Highway 3, 300 ft (91 a) downstream from Quebrada Mariana, and 0.4 mi (0.6 km) south of Humacao. DRAINAGE AREA.--17.3 sq mi (44.8 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1982 to March 1985 (discontinued). GAGE.--Water-stage recorder and concrete control. Elevation of gage 33.33 ft (10.159 a) above mean sea level. REMARKS.--No estimated daily discharges during period of record. Records fair. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,940 cu ft/s (282 cu m/s), July 5, 1983, gage height, 15.00 ft (4.572 a) on basis of rating curve extended above 100 cu ft/s (2.83 cu m/s) on basis of step-backwater analysis and slope-area measurement of peak flow; minimum discharge, 7.9 cu ft/s (0.224 cu m/s), May 1-4, 9, 10, 1984. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 2,000 cu ft/s (56.6 cu m/s) and maximum (*); Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (a) Oct. 14 0515 *1,740 49.3 *10.19 3.106 Minimum discharge, 14 cu ft/s (0.396 cu m/s), Mar. 21, 25, 28. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 35 121 58 38 29 24 2 40 159 71 39 28 19 3 63 454 56 29 25 30 4 29 331 45 39 24 20 6 28 483 48 32 23 21 6 60 426 47 30 22 24 7 67 233 45 28 23 42 8 53 147 50 29 20 37 9 168 126 57 27 21 24 10 145 115 49 27 21 19 11 72 108 46 31 20 17 12 49 104 68 30 20 18 13 92 99 43 30 19 19 14 374 113 41 30 22 18 15 153 101 42 29 23 17 16 122 87 46 30 20 16 17 111 81 47 28 20 17 18 69 78 42 29 19 33 19 56 78 45 29 25 18 20 50 74 43 28 29 17 21 43 71 37 26 22 17 22 43 66 33 27 20 16 23 41 67 33 26 19 18 24 40 49 34 25 20 16 25 50 82 39 25 20 15 26 77 87 36 26 21 18 27 50 54 32 25 36 16 28 53 52 32 25 56 18 29 47 49 31 24 --- 385 30 41 53 38 23 85 31 37 --- 33 24 62 TOTAL 2358 4148 1367 888 667 1114 MEAN 76.1 138 44.1 28.6 23.8 35.9 MAX 374 483 71 39 56 385 MIN 28 49 31 23 19 15 CFSM 4.40 7.98 2.55 1.65 1.38 2.08 IN. 5.07 8.92 2.94 1.91 1.43 2.40 AC-FT 4680 8230 2710 1760 1320 2210 CAL YR 1984 TOTAL 17640.4 MEAN 48.2 MAX 483 MIN 8.6 CFSM 2.79 IN. 37.93 AC-FT 34990 209 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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 02... 1210 77 178 7.40 26.0 1.3 6.8 83 19 N32000 17000 JAN 1985 11... 1100 28 260 7.40 24.5 45 8.5 102 30 360000 K13000 MAR 13... 1200 18 294 7.40 27.5 9.4 118 10 K500 MAY 31... 1115 43 235 7.60 28.5 5.5 8.5 108 <10 K1000 K1000 AUG 22... 1710 11 374 7.60 27.0 11 6.0 75 22 K130000 32000 ALKA- MAGNE- SODIUM POTAS- LINITY CHLO- HARD- CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS SO4) AS CL) NOV 1984 02... 49 13 4.1 15 1 2.3 52 11 14 JAN 1985 11... 75 20 6.0 23 1 1.6 81 <0.5 12 24 MAR 13... 85 MAY 31... 71 19 5.6 21 1 1.9 79 <0.5 8.8 21 AUG 22... 87 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 1984 02... <0.1 25 120 24 111 0.37 0.03 0.40 0.11 0.69 JAN 1985 11... 0.1 37 170 13 116 0.87 0.03 0.90 0.33 0.97 MAR 13... 0.77 0.03 0.80 0.12 0.78 MAY 31... 0.2 35 160 19 22 0.48 0.02 0.50 0.08 0.42 AUG 22... 13 0.48 0.02 0.50 0.73 0.37 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 1984 02... 0.8 1.2 5.3 0.18 JAN 1985 11... 1.3 2.2 9.7 0.32 <1 100 <20 <1 <1 20 MAR 13... 0.9 1.7 7.5 0.29 MAY 31... 0.5 1.0 4.4 0.08 <1 100 20 1 1 10 AUG 22... 1.1 1.6 7.1 0.40 K = non-ideal count 210 RIO HUMACAO BASIN 50082000 RIO HUMACAO AT HIGHWAY 3 AT HUMACAO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS 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 HO) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MO/L) NOV 1984 02... JAN 1985 11... 4200 <1 <1 1 50 <0.01 4 0.04 MAR 13... MAY 31... 640 7 120 <0.1 <1 <1 <10 <0.01 6 0.03 AUG 22... RIO GUAYANES BASIN 50083500 RIO GUAYANES AT YABUCOA, PR WATER-QUALITY RECORDS 211 LOCATION.--Lat 18°03'33", long 65°54'03", at bridge on Highway 182, 1.4 mi (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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 31... 0935 57 160 7.20 23.0 16 8.2 95 44 K13000 230 JAN 1985 30... 1030 30 168 7.40 22.0 3.0 9.0 102 17 K9000 2000 APR 22... 1325 35 146 7.30 25.5 29 7.3 89 <10 2000 2500 JUN 14... 1440 36 165 7.40 27.0 16 8.4 104 <10 2600 540 AUG 22... 1218 31 176 7.50 27.5 15 7.7 97 23 K1200 460 ALKA- MAGNE- SODIUM POTAS- LINITY CHLO- HARD- CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1984 31... 44 11 3.9 13 0.9 1.1 52 4.1 11 JAN 1985 30... 48 12 4.3 16 1 1.0 59 <0.5 3.4 13 APR 22... 51 JUN 14... 47 12 4.1 15 1 1.2 58 <0.5 4.1 12 AUG 22... 56 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 1984 31... <0.1 34 110 17 18 <0.01 0.30 0.04 0.16 JAN 1985 30... 0.1 36 120 9.8 14 <0.01 0.20 0.04 APR 22... 38 0.27 0.03 0.30 0.06 0.84 JUN 14... 0.2 35 120 12 36 <0.01 0.10 0.04 0.66 AUG 22... 12 <0.01 0.20 0.04 0.26 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 1984 31... JAN 1985 30... APR 22... JUN 14... AUG 22... 0.2 <0.1 0.9 0.7 0.3 0.5 2.2 1.2 6.3 0.8 3.5 0.5 2.2 0.01 <0.01 <1 <100 <20 <1 <1 <10 0.04 -- 0.04 <1 100 <20 <1 2 <10 0.06 K = non-ideal count 212 RIO GUAYANES BASIN 50083500 RIO GUAYANES AT YABUCOA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS 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 1984 31... JAN 1986 30... 1500 1 80 <0.1 <1 <1 <10 <0.01 8 0.01 APR 22... 0.2 JUN 14... 1900 1 100 <0.1 <1 <1 30 <0.01 <1 0.02 AUG 22... CHLOR- DI- DI- PCB, ALDRIN, DANE, DDD, DDB, 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) AUG 1985 22... 1218 <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 TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) AUG 1985 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- TOY- 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) AUG 1985 22... <0.01 <0.01 <0.01 <0.01 <0.1 <0.1 <1 <0.01 I RIO GUAYANES BASIN 50086500 RIO GUAYANES ABOVE MOUTH AT PLAYA DE GUAYANES, PR WATER-QUALITY RECORDS 213 LOCATION.--Lat 18°03'45", long 65°49'42", at old 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 i (88.1 sq ka). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIE- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 02... 0905 650 114 6.80 25.0 65 7.5 90 30 JAN 1985 30... 1300 45 200 7.70 25.0 4.0 9.5 113 23 2300 K70 APR 22... 1040 47 195 7.30 25.5 38 6.0 73 10 4500 K1100 JUN 14... 1135 68 208 7.60 27.5 11 8.6 106 <10 230 310 AUG 22... 1520 20 267 7.90 26.5 16 5.8 70 16 370 270 ALKA- MAGNE- SODIUM POTAS- LINITY CHLO- HARD- CALCIUM SIUM, SODIUM, AD- SIUM, WH WAT SULFATE RIDE, NESS DIS- DIS- DIS- SORP- DIE- TOTAL SULFIDE DIS- DIE- (m03/1. SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CACO3) AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) NOV 1984 02... 27 7.0 2.4 9.5 0.8 2.2 30 8.2 9.0 JAN 1985 30... 52 13 4.7 19 1 1.5 64 <0.5 6.3 17 APR 22... 66 JUN 14... 55 14 4.8 18 1 1.6 65 <0.5 7.0 16 AUG 22... 75 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/I. (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 1984 02... <0.1 15 71 125 417 0.16 0.04 0.20 0.15 1.6 JAN 1985 30... 0.1 36 140 17 9 <0.01 0.30 0.03 0.17 APR 22... 60 0.28 0.02 0.30 0.07 0.53 JUN 14... 0.2 35 140 25 15 0.19 0.01 0.20 0.05 0.85 AUG 22... 14 <0.01 0.20 0.07 0.33 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 1984 02... 1.8 2.0 8.9 0.33 JAN 1985 30... 0.2 0.5 2.2 <0.01 <1 <100 <20 <1 2 <10 APR 22... 0.6 0.9 4.0 0.10 -- JUN 14... 0.9 1.1 4.9 <1 100 20 <1 5 <10 AUG 22... 0.4 0.6 2.7 0.14 K = non-ideal count RIO GUAYANES BASIN 214 50086500 RIO GUAYANES ABOVE MOUTH AT PLAYA DE GUAYANES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 ENABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MO/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) NOV 1984 02... -- JAN 1985 30... 1500 1 60 0.1 <1 <1 20 (0.01 1 0.02 APR 22... 0.1 JUN 14... 1200 1 100 <0.1 <1 <1 30 <0.01 1 0.03 AUG 22... I I 215 RIO MAUNABO BASIN 50090500 RIO MAUNABO AT LIZAS, PR LOCATION.--Lat 18°01'38", long 65°56'24", Hydrologic Unit 21010005, on right bank, off Highway 759 at Lizas, about 1.0 mi (1.6 km) below Quebrada Coroco, and about 3.0 mi (4.8 km) northwest of Maunabo. DRAINAGE AREA.--5.38 aq mi (13.93 aq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February 1971 to January 1985 (discontinued). GAGE.--Water-stage recorder. Elevation of gage is 230 ft (70 ), fro topographic map. REMARKS.--No estimated daily discharges during period of record. Records fair. AVERAGE DISCHARGE.--13 years (1972-84), 18.4 cu ft/s (0.521 cu m/s), 46.44 in/yr (1,180 ma/yr), 13,330 acre-ft/yr (16.4 ou hm/yr); median of yearly mean discharges, 15 cu ft/s (0.42 cu m/s), 10,900 acre-ft/yr (13 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 6,280 cu ft/s (178 ou m/s), Aug. 31, 1979, gage height, 14.57 ft (4.441 m), from rating curve extended above 50 cu ft/s (1.42 ou m/s) on basis of step-backwater analysis; minimum daily discharge, 2.2 cu ft/s (0.062 cu m/s), July 16, Aug. 7, 13, 1974. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 600 cu ft/s (17.0 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Oct. 9 1615 *1,530 43.3 *8.84 2.694 Nov. 3 1000 708 20.1 7.05 2.149 Nov. 2 1800 626 17.7 6.81 2.076 Minimum discharge, 6.9 cu ft/a (0.196 cu m/s), Jan. 24. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 18 95 13 11 2 17 143 36 17 3 49 288 19 12 4 21 157 17 21 5 18 182 15 12 6 19 256 14 15 7 72 127 14 11 8 29 64 13 9.8 9 144 46 14 9.7 10 61 37 14 11 11 31 30 13 9.6 12 23 27 13 9.1 13 29 24 13 8.7 14 110 26 13 8.6 15 91 22 12 8.3 16 44 19 13 8.3 17 41 18 13 8.2 18 28 17 12 8.3 19 26 16 12 8.0 20 23 15 12 7.9 21 28 14 11 7.8 22 26 15 11 7.7 23 21 15 11 7.5 24 19 15 12 7.5 25 21 33 13 7.5 26 19 39 14 8.6 27 17 16 14 7.6 28 19 15 12 7.6 29 18 14 11 7.2 30 17 14 14 --- 31 15 --- 13 TOTAL 1114 1799 431 MEAN 35.9 60.0 13.9 MAX 144 288 36 MIN 15 14 11 CFSM 6.67 11.2 2.58 IN. 7.70 12.44 2.98 AC-FT 2210 3570 855 CAL YR 1984 TOTAL 6843.3 MEAN 18.7 MAX 288 MIN 3.8 CFSM 3.48 IN. 47.32 AC-FT 13570 216 RIO MAUNABO BASIN 60090500 RIO MAUNABO AT LIZAS, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORDS--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TUBE DATE TIME INSTANTANEOUS DUCTANCE TUBE (CFS) (UMEOS) (DEG C) (CFS) (UMHOS) (DEG C) JAN, 29 1305 7.3 195 24.0 APR, 11 1422 7.4 207 27.0 I I I RIO MAUNABO BASIN 50091000 RIO MAUNABO AT MAUNABO, PR 217 WATER-QUALITY RECORDS LOCATION,--Lat 18°00'24", long 65°54'19", at bridge on Highway 3, 0.4 mi (0.6 km) southwest of Maunabo plaza, and 1.3 mi (2.1 km) upstream fro mouth. DRAINAGE AREA.--12.4 sq i (32.1 sq km). PERIOD OF RECORD.--Water year 1958-66, 1975 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIE- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- ° FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIE- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 31... 1210 32 226 7.40 26.5 5.1 8.4 104 33 22000 430 FEB 1985 04... 1106 12 255 7.60 25.0 2.0 9.8 117 20 4000 640 APR 24... 1350 30 174 6.90 28.0 15 8.3 106 21 2400 2200 JUN 17... 1435 12 229 7.60 31.5 7.9 7.9 105 10 K7800 500 AUG 21... 1330 17 229 8.00 31.0 3.5 7.7 103 17 ALKA- MAGNE- SODIUM POTAS- LINITY CHLO- HARD- CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS DIS- DIE- DIE- SORP- DIS- TOTAL SULFIDE DIS- DIE- (MO/L SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CACO3) AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS SO4) AS CL) OCT 1984 31... 68 16 6.8 20 1 0.9 74 11 18 FEB 1985 04... 80 19 8.0 22 1 0.9 89 <0.6 11 19 APR 24... 56 JUN 17... 72 17 7.1 21 1 1.1 77 <0.5 9.8 18 AUG 21... 75 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIE- 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 FENDED (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 1984 31... 0.1 35 150 13 5 0.49 0.01 0.50 0.06 0.04 FEB 1985 04... 0.1 37 170 6.5 13 <0.01 0.20 0.06 0.14 APR 24... 26 0.38 0.02 0.40 0.12 0.38 JUN 17... 0.2 38 160 5.1 6 0.09 0.01 0.10 0.04 0.66 AUG 21... 13 <0.01 0.10 0.03 0.37 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 1984 31... 0.1 0.6 2.7 0.01 FEB 1985 04... 0.2 0.4 1.8 0.05 <1 <100 30 1 4 <10 APR 24... 0.5 0.9 4.0 0.08 JUN 17... 0.7 0.8 3.5 0.02 <1 <100 20 <1 6 <10 AUG 21... 0.4 0.5 2.2 0.06 K = non-ideal count 218 RIO MAUNABO BASIN 50091000 RIO MAUNABO AT MAUNABO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LEHR 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 1984 31... FEB 1985 04... 710 <1 60 <0.1 <1 <1 <10 <0.01 2 0.03 APR 24... <0.1 JUN 17... 470 2 40 <0.1 <1 <1 50 <0.01 5 0.03 AUG 21... 219 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 aq mi (12.8 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 31... 1350 6.6 442 7.40 27.0 3.3 6.0 75 33 5700000 JAN 1985 09.., 1345 1.9 624 7.60 26.0 2.0 2.2 27 57 4000000 K90000 APR 24... 1135 2.4 525 6.90 27.0 1.0 5.4 68 51 2800000 K170000 JUN 17... 1140 0.3 831 7.20 31.0 6.1 0 140 1200000 920000 AUG 21... 1635 1.8 598 7.90 29.0 11 2.7 35 140 4800000 200000 ALKA- MAGNE- SODIUM POTAS- LINITY CHLO- HARD- CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CACO3) AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS 804) AS CL) OCT 1984 31... 110 24 12 52 2 1.6 146 27 36 JAN 1985 09... 130 29 14 67 3 3.8 198 <0.5 36 49 APR 24... 167 JUN 17... 140 35 12 86 3 8.5 251 1.4 55 78 AUG 21... 153 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 1984 31... 0.1 30 270 4.8 22 0.59 0.11 0.70 2.50 1.5 JAN 1985 09... 0.2 30 350 1.8 9 0.18 0.02 0.20 7.20 5.8 APR 24... 16 0.18 0.02 0.20 7.80 6.2 JUN 17... 0.2 33 460 0.37 39 0.04 <0.10 20.0 6.0 AUG 21... 28 0.39 0.21 0.60 5.40 4.3 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 1984 31... 4.0 4.7 21 0.69 JAN 1985 09... 13 13 58 2.00 1 <100 <20 1 27 50 APR 24... 14 14 63 1.40 JUN 17... 26 4.60 <1 <100 70 8 42 270 AUG 21... 9.7 10 46 1.70 K = non-ideal count 220 RIO CHICO BASIN 50091800 RIO CHICO AT PROVIDENCIA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 DATE MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS 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 (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HO) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1984 31... JAN 1985 09... APR 24... JUN 17... AUG 21... 220 1000 1 <1 80 130 <0.1 <0.1 <1 <1 <1 2 100 560 0.04 <0.01 10 12 1.3 4.7 I 221 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 from Lago Patillas Dam and 2.2 mi (3.5 km) northwest of Patillas. DRAINAGE AREA.--18.3 sq mi (47.4 sq 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. Elevation of gage is 235 ft (72 m), from topographic map. REMARKS.--Estimated daily discharges: Dec. 31 to Jan. 10, Aug. 20-27. Records poor. AVERAGE DISCHARGE.--19 years (1967-85), 60.4 cu ft/s (1.710 cu m/s), 44.82 in/yr (1,138 am/yr), 43,760 acre-ft/yr (54.0 cu hm/yr); median of yearly mean discharges, 61 cu ft/s (1.73 cu m/s), 44,200 acre-ft/yr (54 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 14,800 cu ft/s (419 cu m/s), Sept. 16, 1975, gage height, 12.45 ft (3.795 m), from rating curve extended above 250 cu ft/s (7.08 cu m/s) on basis of slope-area measurement of peak flow; minimum discharge, 4.6 cu ft/a (0.130 cu m/s), May 13-16, 1968, gage height, 3.55 ft (1.082 m). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ou ft/s (70.8 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/a) (cu /a) (ft) (m) Date Time (cu ft/a) (cu m/s) (ft) (m) Oct. 9 1400 4,760 135 10.32 3.146 May 17 1130 3,500 99.1 9.36 2.862 Nov. 3 0630 *9,190 260 *12.86 3.920 May 18 0845 5,680 161 10.93 3.331 Minimum daily discharge, 8.3 cu ft/s (0.235 cu m/s), June 30. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 42 39 57 49 60 230 511 1900 522 1080 51 124 93 67 61 30 33 27 28 28 20 20 19 19 19 36 34 38 39 40 23 20 19 21 22 22 24 32 31 32 27 28 30 30 28 9.4 9.8 10 11 10 24 23 22 21 21 32 30 27 25 23 6 7 8 9 10 62 72 75 528 254 1160 658 245 159 115 55 51 47 49 49 30 27 26 24 24 20 21 21 21 21 41 52 48 35 29 19 21 21 22 21 29 29 27 27 27 27 25 23 20 17 9.9 11 12 12 11 21 20 20 25 23 22 21 30 29 21 11 12 13 14 15 136 88 123 178 148 95 82 76 84 94 44 42 41 38 36 24 23 23 22 22 21 22 22 26 28 26 26 25 23 23 23 22 25 20 16 39 31 30 147 325 12 12 10 11 11 11 10 9.6 15 67 23 21 35 30 34 27 159 469 108 66 16 17 18 19 20 129 108 82 67 63 73 70 71 68 63 37 38 35 33 32 21 21 21 21 21 24 20 19 22 25 23 23 131 32 25 31 37 42 27 19 162 676 1150 213 77 11 9.3 8.7 9.8 9.7 111 242 25 15 22 27 25 24 25 24 45 37 31 28 28 21 22 23 24 25 66 59 54 51 63 62 68 79 71 97 29 29 28 31 36 21 21 21 20 19 21 20 19 19 18 21 19 16 16 15 31 19 198 158 82 52 45 39 31 30 9.7 9.6 10 10 10 33 23 26 68 45 23 23 23 24 25 27 26 31 288 610 26 27 28 29 30 31 81 72 60 56 53 49 177 77 65 60 56 --- 34 34 34 28 32 33 22 20 19 19 19 19 23 88 38 --- 16 17 18 63 30 37 43 31 29 26 23 --- 30 27 28 29 29 28 9.3 8.7 9.0 8.7 8.3 --- 87 41 41 34 26 25 24 92 116 44 35 33 152 81 78 58 50 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 3024 97.5 528 39 5.33 6.15 6000 8168 272 1900 56 14.9 16.60 16200 1371 44.2 124 28 2.42 2.79 2720 716 23.1 33 19 1.26 1.46 1420 676 24.1 88 18 1.32 1.37 1340 1017 32.8 131 15 1.79 2.07 2020 1111 37.0 198 16 2.02 2.26 2200 3498 113 1150 22 6.17 7.11 6940 452.8 15.1 30 8.3 .83 .92 898 1082.7 34.9 242 9.4 1.91 2.20 2150 950 30.6 116 20 1.67 1.93 1880 2659 88.6 610 21 4.84 5.41 5270 CAL YR 1984 TOTAL WTR YR 1985 TOTAL 24835.4 24725.5 MEAN MEAN 67.9 67.7 MAX MAX 1900 1900 MIN MIN 9.0 8.3 CFSM 3.71 CFSM 3.70 IN. IN. 50.49 50.26 AC-FT 49260 AC-FT 49040 RIO GRANDE DE PATILLAS BASIN 222 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 1984 TO SEPTEMBER 1985 OXYGEN, COLI- STREP- SPE- DIE- FORM, TOCOCCI STREAM- CIFIC SOLVED FECAL, FECAL, HARD- FLOW, CON- PH TOR- OXYGEN, (PER- 0.7 KF AGAR NESS INSTAN- DUCT- (STAND- TEMPER- BID- DIE- CENT UM-MF (COLS. (MG/L DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- (COLS./ PER AS (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) 100 ML) 100 ML) CAC03) OCT 1984 11... 1120 136 140 7.60 25.5 7.0 9.4 114 3600 500 39 JAN 1985 09... 1035 24 168 7.60 21.0 1.0 10.6 118 420 56 52 APR 04... 1250 20 170 7.80 25.0 1.0 8.2 99 250 120 50 CALCIUM DIE- MAGNE- SIUM, DIE- SODIUM, DIS- SODIUM AD- SORP- POTAS- SIUM, DIE- ALKA- LINITY WATER TOTAL SULFATE DIE- CHLO- RIDE, DIE- FLUO- RIDE, DIE- SILICA, DIE- SOLVED SOLIDS, RESIDUE AT 180 DEG. C SOLVED SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MG/L DIE- 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 1984 11... 8.6 4.2 13 0.9 0.5 39 9.1 13 0.1 24 98 JAN 1985 09... 12 5.3 14 0.9 0.4 53 11 13 <0.1 24 116 APR 04... 11 5.4 13 0.8 0.4 52 11 12 <0.1 24 116 SOLIDS, NITRO- NITRO- NITRO- NITRO- PHOS- PHOS- SUM OF SOLIDS, GEN, GEN, GEN, GEN,AM- PROS- PHORUS, PHATE, ALUM- CONSTI- DIS- NO2+NO3 AMMONIA AMMONIA MONIA + PHOS- PHORUS, ORTHO, ORTHO, INUM, TUENTS, SOLVED DIS- DIS- DIS- ORGANIC PHORUS, DIE- DIE- DIS- DIE- DIE- (TONS SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED SOLVED SOLVED SOLVED DATE SOLVED PER (MG/L (MG/L (MG/L (MG/1. (MO/L (MG/L (MG/L (MG/L (UG/L (MG/L) DAY) AS N) AS N) AS NH4) AS N) AS P) AS P) AS P) AS PO4) AS AL) OCT 1984 11... 96 36 0.57 0.13 0.17 0.2 0.04 0.04 0.03 0.09 40 JAN 1985 09... 110 7.5 0.19 0.03 0.04 0.3 0.08 0.02 0.02 0.06 20 APR 04... 110 6.3 <0.10 <0.01 0.2 0.01 <0.01 <0.01 30 BERYL- CHRO- MANGA- ARSENIC BARIUM, LIUM, CADMIUM MIUM, COBALT, COPPER, IRON, LEAD, LITHIUM NESE, DIS- DIS- DIS- DIS- DIS- DES- DIE- DES- DIE- 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 AS) AS BA) AS BE) AS CD) AS CR) AS CO) AS CU) AS FE) AS PB) AS LI) AS MN) OCT 1984 11... <1 19 <0 <1 <1 <3 <1 61 1 <4 12 JAN 1985 09... <1 18 0.5 <1 2 <3 1 22 1 <4 6 APR 04... <1 18 <0.5 <1 <1 <3 1 19 1 <4 5 RIO GRANDE DE PATILLAS BASIN 223 50092000 RIO GRANDE DE PATILLAS NEAR PATILLAS, PR--Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 SEDI- MOLYB- SELF- STRON- VANA- MENT, MERCURY DENUM, NICKEL, NIUM, SILVER, TIUM, DIUM, ZINC, SEW- DIS- DUI- DIS- DIS- DIS- DIE- DIS- DIS- DIE- MENT, CHARGE, SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SUS- SUS­ DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L PENDED PENDED AS HO) AS MO) AS NI) AS SE) AS AG) AS SR) AS V) AS ZN) (MG/L) (T/DAY) OCT 1984 11... <0.1 <10 2 <1 <1 35 <6 9 22 8.1 JAN 1985 09... <0.1 <10 <1 <1 <1 40 <6 7 1 0.06 APR 04... <0.1 <10 1 <1 <1 41 <6 9 31 1.7 SED. SUSP. STREAM- 3EDI- SIEVE FLOW, MENT, DIAM. INSTAN- SUS- % FINER DATE TIME TANEOUS PENDED THAN (CFS) (MG/L) .062 MM OCT 1984 11... 1120 136 22 99 APR 1985 04... 1250 20 31 92 JUL 02... 1145 10 32 79 I EXPLANATION R(o Grande de felonoti basin A080 SURFACE-WATER STATION AND NUMBER 1007 LOW-FLOW STATION AND NUMBER divide QUALITY-OF-WATER V1065 AIBONITO STATION AND NUMBER N WELL AND WELL NUMBER Rro de la Plata basin VILLALBA CAYEY Lego a •go Drainage boundary Gooyabol basin COAMO ..? Drainage boundary\ • e. JUAN 1/4.„‘ DIAZ ti Rib Guainani.boils Rib Seco basin T,j• ago Coarrw (5J. ./ •88 1120 Copal 0" .7/ GUAYAMA 087 ALIN S • 1070 SANTA ISA EL 149 Ai ---- II 146, 4 5 CENTRAL AGUIRRE Soind de Jobos CARIBBEAN SEA .AODADR. LA FAJARDO MAYA5UEZ CACILIAS. PO CE >;j5•UAYAMA 41. 5 KILOMETERS ri I Map area 01 2 3 4 S MILES Figure 23.--South coast river basins--Rio Salinas to Rio Jacaguas basins. I I 226 RIO COAMO BASIN 50106500 RIO COAMO NEAR COAMO, PR LOCATION.--Lat 18'03'52", long 66°22'10", Hydrologic Unit 21010004, on Highway 153 bridge, 0.4 mi (0.6 km) above Rio de la Mina, and 1.8 mi (2.9 km) south of Coamo plaza. ,DRAINAGE AREA.--46.0 sq mi (119.1 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1959-61 (annual low-flow measurements only), September 1960 (indirect flood measurement only), 1965-67 (annual maximum discharge only), January 1967 to December 1968, January to December 1969 (high-water discharges only), January to December 1970, (annual maximum discharge and occasional measurements only). February 1984 to September 1985 (discontinued). GAGE.--Water-stage recorder. Elevation of gage is 260 ft (79 m), from topographic map. REMARKS.--Estimated daily discharges: Oct. 16, Dec. 3-10, Apr. 28 to May 15, May 19-21, and Sept. 13-30. Records fair except those for estimated daily discharges, which are poor. Diversion to Coamo water treatment plant, for municipal supply, upstream from station. Some diurnal fluctuation from return flow fro Coamo sewage treatment plant. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 22,000 cu ft/a (623 cu m/s), Oct. 9, 1970, gage height, 21.4 ft (6.52 m), from floodmark, on basis of contracted-opening measurement of peak flow; minimum discharge, 1.3 cu ft/s (0.037 cu m/s), Apr. 10, 11, 1968. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 cu ft/a (56.6 cu m/s) and maximum (a): Discharge Gage height Discharge Gage height Date Time (cu ft/a) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/a) (ft) (m) Nov. 3 0815 *3,500 99.1 1 7.34 2.237 May 17 1415 2,650 75.0 6.51 1.984 Apr. 26 1600 2,610 73.9 6.51 1.984 May 18 1100 2,460 69.4 6.29 1.917 Minimum discharge, 4.6 cu ft/a (0.13 ou /a), Apr. 15. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 17 15 54 30 13 9.8 13 12 62 17 22 23 2 14 23 66 29 13 9.4 11 11 57 18 18 21 3 26 808 54 28 13 9.1 10 10 82 18 12 20 4 12 187 51 27 13 8.5 10 9.6 58 18 11 19 5 75 255 47 26 12 8.0 9.6 8.7 53 18 12 21 6 75 256 43 26 12 8.6 8.9 8.3 47 18 10 36 7 53 237 41 26 12 10 9.0 8.7 44 17 9.6 26 8 47 189 40 26 12 11 7.9 8.3 43 17 9.9 25 9 159 148 38 25 11 11 7.5 8.3 41 18 11 26 10 79 120 36 25 11 11 7.1 8.0 39 18 11 25 11 43 104 35 25 12 12 7.1 8.0 37 16 20 25 12 38 89 34 23 11 14 6.7 7.6 35 15 14 48 13 36 83 34 21 11 15 6.0 7.6 34 14 16 700 14 61 79 33 20 12 16 5.2 7.3 33 15 15 100 15 39 77 33 19 13 17 6.1 66 30 35 13 50 16 30 72 33 19 12 17 5.2 239 25 23 12 35 17 35 68 36 18 11 19 5.7 700 25 22 12 30 18 64 66 35 17 11 32 6.3 933 27 18 12 27 19 56 63 34 17 11 24 6.3 312 25 16 12 25 20 34 60 33 16 10 20 6.2 169 24 17 12 23 21 25 59 32 15 10 20 6.2 140 23 16 13 22 22 21 58 32 15 9.6 18 6.3 119 31 15 13 21 23 19 56 31 15 9.3 18 154 101 34 14 13 23 24 17 55 33 15 10 17 77 95 29 14 13 190 25 16 81 32 15 10 16 46 92 26 13 13 280 26 16 96 32 15 11 18 240 88 24 13 13 50 27 15 69 31 15 9.9 17 26 82 22 13 37 30 28 15 60 31 14 11 15 17 76 20 13 25 21 29 16 56 31 14 17 15 73 20 13 18 18 30 31 14 15 65 --- 31 31 14 13 17 15 14 --- 70 66 18 --- 12 11 35 36 120 --- TOTAL 1182 3644 1157 623 316.8 470.4 755.3 3544.4 1068 515 493.5 2080 MEAN 38.1 121 37.3 20.1 11.3 15.2 25.2 114 35.6 16.6 15.9 69.3 MAX 159 808 66 30 13 32 240 933 82 35 37 700 MIN 12 15 31 13 9.3 8.0 5.1 7.3 18 11 9.6 18 CFSM .83 2.63 .81 .44 .25 .33 .55 2.48 .77 .36 .35 1.51 IN. .96 2.95 .94 .50 .26 .38 .61 2.87 .86 .42 .40 1.68 AC-FT 2340 7230 2290 1240 628 933 1500 7030 2120 1020 979 4130 WTR YR 1985 TOTAL 15849.4 MEAN 43.4 MAX 933 MIN 5.1 CFSM .94 IN. 12.82 AC-FT 31440 227 RIO COAMO BASIN 50106600 RIO COAMO NEAR COAMO, PR WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1978 to current year. WATER-QUALITY RECORDS, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIES- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 14... 1245 80 650 8.30 25.0 2.6 7.8 95 15 8500 680 JAN 1985 29... 1126 13 696 8.30 26.0 1.0 9.9 120 23 370 K180 MAR 18... 1315 36 500 7.80 26.0 1.5 7.8 97 27 K140000 K170000 MAY 28... 1300 79 630 8.40 30.0 0.8 7.8 104 <10 2700 K1800 AUG 06... 1230 9.7 660 >8.40 31.0 2.0 7.4 100 11 500 K75 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WH WAT SULFATE RIDE, NESS WH WAT DIS- DIS- DIS- SORP- DIE- TOTAL SULFIDE DIS- DIS- (MO/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MO/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 904) AS CL) NOV 1984 14... 280 30 74 22 32 0.9 2.9 245 39 43 JAN 1985 29... 280 17 75 23 39 1 4.0 265 <0.5 38 46 MAR 18... 186 MAY 28... 270 27 72 23 35 1 2.9 248 <0.5 34 42 AUG 06... 233 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DUI- 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 1984 14... 0.2 32 390 86 11 3.46 0.04 3.50 0.47 0.43 JAN 1985 29... 0.2 30 410 15 3 3.33 0.27 3.60 0.38 0.62 MAR 18... 82 -- MAY 28... 0.1 31 390 83 20 2.88 0.04 2.90 0.30 0.2 AUG 06... 14 2.67 0.23 2.90 0.42 0.58 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) NOV 1984 14... 0.9 4.4 19 0.29 JAN 1985 29... 1.0 4.6 20 0.74 1 <100 70 1 2 <10 MAR 18... MAY 28... 0.5 3.4 15 0.25 <1 <100 70 1 7 <10 AUG 06... 1.0 3.9 17 0.70 228 RIO COAMO BASIN 50106600 RIO COAMO NEAR COAMO, PR--Continued WATER-QUALITY RECORDS, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 DATE MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS 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 (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 1984 14... JAN 1985 29... MAR 18... MAY 28... AUG 06... 230 1000 1 5 30 60 <0.1 0.3 <0.1 <1 <1 <1 <1 60 30 <0.01 <0.01 -- 4 0.09 0.06 RIO DESCALABRADO BASIN 229 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 mi (2.4 km) west of Los Limnos, and 5.3 mi (8.5 km) east of Juana Diaz. DRAINAGE AREA.--12.9 sq mi (33.4 sq km). 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 (maximum discharge only), February to September 1984. GAGE.--Water-stage recorder. Elevation of gage is 220 ft (67 m), from topographic map. REMARKS.--Estimated daily discharges: Oct. 1-13, Apr. 27 to May 10, May 19-21, Aug. 2-9, Aug. 13 to Sept. 3, and Sept. 7-12. Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 7,000 cu ft/s (198 cu m/s), May 21, 1969, gage height, 11.5 ft (3.50 m), from rating curve extended above 250 cu ft/s (7.08 cu m/s) on basis of slope-area measurements of peak flow; no flow many days. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 1,500 cu ft/s (19.8 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Nov, 3 0700 1,510 42.8 7.55 2.301 Aug. 11 1430 1,560 44.2 7.64 2.329 Nov. 27 1500 2,300 65.1 8.79 2.679 Sept. 5 1600 1,590 45.0 7.69 2.344 Apr. 26 1600 1,560 44.2 7.64 2.329 Sept. 6 1645 1,580 44.7 7.68 2.341 May 18 0815 *2,490 70.5 *9.07 2.765 Minimum daily discharge, 0.47 cu ft/s (0.013 cu m/s), Apr. 22. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 12 14 17 5.0 2.7 1.3 .90 .68 15 5.5 17 2.8 2 10 11 19 5.0 2.6 1.1 .90 .70 14 5.7 6.2 2.7 3 18 266 16 4.8 2.4 1.0 .91 .60 15 5.8 4.1 2.7 4 13 40 14 4.9 2.4 .89 .81 .59 14 5.5 3.2 3.2 5 50 79 13 4.7 2.4 .83 .80 .58 11 5.2 2.7 112 6 25 52 12 5.1 2.4 .89 .78 .58 12 5.1 2.4 171 7 16 45 12 5.3 2.3 .99 .86 .64 8.1 4.9 2.3 10 8 15 43 11 4.8 2.3 .95 .81 .60 7.5 5.1 2.2 4.5 9 201 40 11 4.6 2.4 .88 .76 .59 7.0 5.0 2.2 4.0 10 30 36 10 4.4 2.3 .80 .78 26 7.0 4.8 2.5 3.5 11 20 35 9.9 4.4 2.7 .77 .77 1.7 6.9 4.5 67 3.2 12 18 32 9.5 4.2 2.4 .82 .72 1.7 6.9 4.6 3.7 3.0 13 17 29 9.2 4.0 2.2 .89 .67 1.8 6.4 4.5 3.0 67 14 23 27 8.8 4.1 3.2 .84 .66 2.0 6.0 4.8 2.8 11 15 15 23 8.8 3.9 2.6 .78 .65 61 5.4 14 2.7 4.5 16 14 21 9.2 3.8 2.4 .72 .61 61 5.0 3.8 3.1 3.5 17 11 20 8.4 3.8 1.9 .69 .64 205 4.9 4.0 2.7 3.1 18 30 19 7.9 3.8 1.7 2.8 .63 428 8.3 3.0 2.6 2.8 19 26 18 7.9 3.7 1.9 1.4 .54 101 5.6 2.9 2.5 2.4 20 16 16 7.5 3.7 1.8 1.2 .52 56 5.1 3.0 2.7 2.3 21 14 14 7.1 3.6 1.5 1.2 .51 44 4.7 3.0 2.6 2.4 22 12 12 6.8 3.6 1.4 .96 .47 37 20 2.8 2.5 2.6 23 11 11 6.7 3.5 1.4 .92 37 32 34 2.8 3.0 2.2 24 8.6 11 7.6 3.5 1.5 .89 88 28 10 2.6 2.5 19 25 7.1 68 6.5 3.4 1.4 .87 50 25 7.5 2.5 2.4 28 26 6.2 45 6.2 3.4 1.3 .89 127 24 6.4 2.6 2.4 4.6 27 5.6 147 5.9 3.4 1.2 1.1 2.0 21 5.7 2.7 5.8 2.7 28 5.5 20 5.7 3.2 1.7 .90 1.0 18 5.3 3.0 2.5 2.0 29 5.1 18 5.7 3.1 --- 2.0 .80 17 5.2 2.8 2.3 1.4 30 4.8 18 5.5 3.2 1.2 .70 16 5.3 2.7 2.3 18 31 5.0 --- 5.3 2.9 1.0 --- 16 --- 2.5 3.0 --- TOTAL 664.9 1230 291.1 124.8 58.4 32.47 322.20 1228.76 275.2 131.7 168.9 502.1 MEAN 21.4 41.0 9.39 4.03 2.09 1.05 10.7 39.6 9.17 4.25 5.45 16.7 MAX 201 266 19 5.3 3.2 2.8 127 428 34 14 67 171 MIN 4.8 11 5.3 2.9 1.2 .69 .47 .58 4.7 2.5 2.2 1.4 CFSM 1.66 3.18 .73 .31 .16 .08 .83 3.07 .71 .33 .42 1.29 IN. 1.92 3.55 .84 .36 .17 .09 .93 3.54 .79 .38 .49 1.45 AC-FT 1320 2440 577 248 116 64 639 2440 546 261 335 996 WTR YR 1985 TOTAL 5030.53 MEAN 13.8 MAX 428 MIN .47 CFSM 1.07 IN. 14.51 AC-FT 9980 RIO DESCALABRADO BASIN 230 50108000 RIO DESCALABRADO NEAR LOS LLANOS, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1984 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STERAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURK DATE TIME INSTANTANEOUS DUCTANCE TURK (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) DEC, 04 0940 15 578 22.5 MAR, 06 1100 1.0 752 23.0 JAN, 18 1232 3.8 582 24.0 SEP, 12 1332 3.1 612 27.0 FEB, 13 1200 2.2 680 24.0 I 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 i (6.4 km) downstream from Lago Guayabal. DRAINAGE AREA.--49.8 sq ml (129.0 sq km). 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. 6-13, Sept. 10-30. Records fair except those for estimated daily discharges, which are poor. Flow regulation from Lago Guayabal. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 12,700 cu ft/s (360 cu m/s), May 18, 1985, gage height, 18.78 ft (5.724 m) from rating curve extended above 500 cu ft/s (14.2 cu m/s) in basis of step-backwater analysis and discharge of peak flow; minimum daily discharge, 1.2 cu ft/s (0.034 cu m/s), May 18, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 cu ft/s (42.5 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Oct. 5 1900 3,380 95.7 12.13 3.697 May 18 1145 *12,700 360 *18.78 5.724 Oct. 15 1600 4,720 134 13.55 4.130 June 23 1800 4,650 132 13.29 4.051 Nov. 3 1000 5,690 161 14.14 4.310 June 25 1715 2,420 68.5 11.11 3.386 Nov. 25 2145 4,300 122 12.99 3.959 Aug. 1 1630 1,670 47.3 10.21 3.112 Nov. 27 1615 2,150 60.9 10.80 3.292 Sept. 5 1715 4,450 126 13.12 3.999 May 17 0245 5,680 161 14.13 4.307 Minimum daily discharge, 2.2 cu ft/s (0.054 cu m/s), Aug. 19, 1985. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 77 26 102 49 9.2 7.4 6.6 6.3 63 11 273 64 2 80 36 93 56 9.4 7.3 6.7 8.1 47 9.1 46 49 3 88 1270 110 52 7.9 5.6 7.0 8.1 39 11 30 44 4 78 446 97 32 7.4 5.3 6.0 8.3 34 35 13 11 5 376 466 89 30 7.4 5.0 4.9 6.7 24 61 7.8 350 6 90 371 87 31 7.4 5.8 4.5 4.9 24 54 6.6 151 7 70 350 84 35 7.3 5.3 4.0 5.6 18 38 6.3 101 8 60 327 63 24 7.2 5.2 4.4 7.3 13 40 5.7 108 9 180 297 50 11 7.4 5.0 5.9 7.6 8.1 41 5.8 64 10 110 226 57 9.1 7.4 4.8 5.9 7.8 6.4 14 7.6 105 11 88 187 74 7.9 8.6 5.1 6.9 7.8 6.1 13 55 40 12 90 177 74 7.5 9.3 5.1 6.2 7.9 6.0 4.2 82 70 13 104 161 74 7.4 8.9 5.2 6.1 7.4 8.5 3.8 37 900 14 149 137 70 7.4 9.5 5.2 6.2 7.7 13 3.3 49 160 15 628 125 58 7.5 9.2 5.2 6.3 15 13 4.2 51 50 16 216 97 61 7.7 9.5 5.1 6.2 272 11 8.7 53 30 17 109 85 58 8.0 8.7 5.3 6.1 1460 8.6 10 15 lob 18 83 79 29 7.8 7.9 6.4 6.5 2540 7.1 20 3.4 50 19 77 79 24 7.6 7.5 6.0 6.7 539 8.7 31 2.2 33 20 88 65 23 7.4 8.4 5.9 6.6 354 11 16 4.6 24 21 60 37 24 7.7 8.4 5.9 6.6 254 10 7.3 4.8 18 22 52 34 44 9.6 8.0 5.9 6.7 200 64 6.4 4.9 30 23 35 37 45 11 8.2 5.6 7.8 166 450 5.8 3.8 24 24 30 38 58 11 7.8 5.9 109 127 146 4.5 4.6 1400 25 28 397 59 11 7.7 6.1 19 130 427 3.7 4.8 450 26 27 524 37 9.0 7.1 6.5 11 111 75 18 4.9 200 27 22 371 23 8.6 7.1 6.8 8.3 90 72 31 5.7 80 28 16 163 26 8.3 7.3 6.2 6.5 89 36 35 42 56 29 15 149 32 8.7 --- 7.0 5.9 83 23 104 70 40 30 17 118 32 9.2 6.6 5.9 76 16 96 161 120 31 34 --- 44 9.2 6.4 --- 76 --- 37 213 --- TOTAL 3177 6875 1801 508.6 227.1 180.1 306.4 6673.5 1688.5 776.0 1273.5 4922 MEAN 102 229 58.1 16.4 8.11 5.81 10.2 215 56.3 25.0 41.1 164 MAX 628 1270 110 56 9.5 7.4 109 2540 450 104 273 1400 MIN 15 26 23 7.4 7.1 4.8 4.0 4.9 6.0 3.3 2.2 11 CFSM 2.05 4.60 1.17 .33 .16 .12 .20 4.32 1.13 .50 .83 3.29 IN. 2.37 5.14 1.35 .38 .17 .13 .23 4.99 1.26 .58 .95 3.68 AC-FT 6300 13640 3570 1010 450 357 608 13240 3350 1540 2530 9760 WTR YR 1985 TOTAL 28408.7 MEAN 77.8 MAX 2540 MIN 2.2 CFSM 1.56 IN. 21.22 AC-FT 56350 232 RIO JACAGUAS BASIN 50111500 RIO JACAGUAS AT JUANA DIAZ, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1984 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1140 91 257 26.0 MAR, 06 1425 5.7 470 26.0 FEB, 13 1005 8.2 386 25.0 SEP, 12 1032 67 231 28.0 Rio Grande de Ri"o Grande de Arecibo basin / Manati basin • Drainage boundary Grande de Aosco basin divide - \\ Drainage boundary,, ( Guanalibo basin() 1125 SABANA GRANDE go Na ago Atia Pr go Loco JUANA DIAZ .27:\ Lego !Iron, GUAVANI A 241 11 POICibe 1164 4` 1146 141 0104 Bahro de Quayandla Bahria de To lla boa PLAYA DE -PONCE ENSENADA EXPLANATION A1125 SURFACE-WATER STATION AND NUMBER CARIBBEAN S E A 1159 CREST-STAGE GAGING STATION AND NUMBER A1220 LOW-FLOW STATION AND NUMBER V1140 QUALITY-OF-WATER STATION AND NUMBER .--....... ANUAOELLA sANECB0 .1y,,,,, AN • 74 WELL AND WELL NUMBER FAJARD, MAYNNUEC CANONS. -... ON" --` QUA!. / - ,- . 0 2 4 5 KILOMETERS 0 3 4 5 MILES Figure 24.--South coast river basins--Rio Inabon to Rio Loco basins. I I I 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 fro diversion canal, 0.5 mi (0.8 km) north of Real Abajo, and 6.1 mi (9.8 km) northeast of Plaza Degetau in Ponce. DRAINAGE AREA.--9.70 sq mi (25.12 sq km). 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), fro topographic map. Prior to April 1971 nonrecording gage and crest-stage gage at different datum. REMARKS.--No estimated daily discharges during water year. Records fair. AVERAGE DISCHARGE.--19 years (1965-69, 1972-85), 18.7 cu ft/s (0.530 cu m/s), 26.18 in/yr (665 mm/yr), 13,550 acre-ft/yr (16.7 cu hm/yr); median of yearly mean discharges, 18 cu ft/s (0.51 cu m/a), 13,000 acre-ft/yr (16 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 5,720 cu ft/s (162 oil m/s) Oct. 9, 1970, gage height, 20.6 ft (6.28 m), datum then in use, fro floodmark, from rating curve extended above 30 cu ft/s (0.850 cu m/s) on basis of contracted opening and flow-over-road measurements of peak flow; minimum daily discharge, 0.80 cu ft/s (0.023 cu m/s), July 23, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 au ft/a (14.2 cu /s), and maximum (*): Date Time Discharge (cu ft/a) (cu m/s) Nov. 3 0945 841 23.8 Nov. 25 2300 579 16.4 May 6 2015 726 20.6 May 15 1946 834 23.6 May 16 2115 681 19.3 Gage height Discharge Gage height (ft) (m) Date Time (cu ft/a) (cu m/s) (ft) (m) 9.51 2.899 May 17 0115 876 24.8 9.80 2.987 7.26 2.213 May 18 1100 *3,410 96.6 *17.84 5.438 8.54 2.603 June 18 1600 575 16.3 7.22 2.201 9.45 2.880 Aug. 10 1545 698 19.8 8.30 2.530 8.15 2.484 Minimum daily discharge, 1.7 cu ft/s (0.048 cu m/s), Apr. 9. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC 1 19 24 18 2 16 24 19 3 26 250 18 4 19 120 14 5 40 124 13 6 42 108 12 7 30 99 12 8 25 101 11 9 104 85 13 10 79 66 13 11 52 57 12 12 35 50 12 13 44 46 11 14 35 43 9.6 15 54 40 9.5 16 47 37 11 17 45 34 18 18 34 34 10 19 55 32 11 20 48 29 11 21 35 28 9.9 22 29 27 9.7 23 25 26 9.4 24 23 25 15 25 21 74 10 26 20 62 9.0 27 18 38 9.2 28 17 31 9.2 29 16 24 8.2 30 18 20 8.3 31 24 --- 8.5 TOTAL 1094 1757 364.5 MEAN 35.3 58.6 11.8 MAX 104 250 19 MIN 16 20 8.2 CFSM 3.64 6.04 1.22 IN. 4.20 6.74 1.40 AC-FT 2170 3490 723 CAL YR 1984 TOTAL 6450.2 MEAN WTR YR 1985 TOTAL 8838.5 MEAN JAN FEB MAR APR MAY JUN JUL AUG SEP 7.4 4.6 10 3.3 12 18 13 20 22 6.8 4.8 7.0 2.1 19 18 14 15 19 6.5 4.0 8.2 1.8 34 23 14 12 17 6.1 3.7 2.5 2.2 21 20 12 10 15 5.8 3.6 2.3 2.2 18 17 11 10 20 5.6 3.3 3.4 1.8 97 17 12 10 22 5.5 3.3 2.5 1.9 86 16 12 10 25 5.2 3.3 2.7 1.8 35 16 11 8.8 22 5.2 3.5 2.6 1.7 23 15 11 9.3 15 5.0 3.7 2.9 11 23 16 9.9 50 16 5.2 5.4 3.0 27 20 16 12 56 15 5.5 4.6 3.2 15 19 16 13 46 19 4.8 3.4 2.9 7.2 18 16 9.9 36 54 5.1 6.1 2.7 5.0 19 16 9.0 39 33 5.5 5.7 2.3 4.0 168 14 23 37 25 5.6 4.9 2.3 3.6 200 14 12 31 21 5.7 3.9 2.6 3.9 282 14 8.6 28 23 5.9 2.9 12 4.4 633 40 8.2 27 23 5.8 2.9 6.9 3.3 153 22 7.0 25 24 5.4 3.1 7.3 2.7 92 15 7.1 24 21 5.5 2.6 6.6 2.9 60 14 6.6 23 20 5.2 2.3 6.3 11 43 17 6.4 23 19 4.7 1.9 5.0 53 36 37 7.0 22 18 4.5 1.9 4.5 44 31 38 8.2 22 59 4.5 2.0 3.5 60 28 31 8.3 22 78 4.5 2.7 3.1 42 26 26 7.8 23 42 4.5 3.0 4.4 24 24 21 9.0 46 32 4.5 4.6 5.8 17 22 19 11 30 27 4.5 --- 3.3 15 21 16 9.8 25 23 4.6 5.0 13 20 14 11 40 29 4.3 5.2 --- 19 --- 8.7 33 --- 17.6 MAX 250 MIN 2.1 CFSM 1.81 IN. 24.74 AC-FT 12790 24.2 MAX 633 MIN 1.7 CFSM 2.49 IN. 33.90 AC-FT 17530 164.9 101.7 142.0 387.8 2302 591 323.5 812.1 798 5.32 3.63 4.58 12.9 74.3 19.7 10.4 26.2 26.6 7.4 6.1 12 60 633 40 23 55 78 4.3 1.9 2.3 1.7 12 14 6.4 8.8 15 .55 .37 .47 1.33 7.66 2.03 1.07 2.70 2.74 .63 .39 .54 1.49 8.83 2.27 1.24 3.11 3.06 327 202 282 769 4570 1170 642 1610 1580 RIO INABON BASIN 235 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 1984 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TUBE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) FEB, 28 0902 4.9 294 21.0 SEP, 23 1306 17 219 28.5 I I 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 i (7.4 km) northeast of Plaza Degetau in Ponce. DRAINAGE AREA.--17.8 sq mi (46.1 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February to April 1964 (monthly measurements only), May 1964 to June 1985. GAGE.--Water-stage recorder. Datum of gage is 253.10 ft (77.145 m) above mean sea level. Prior to Mar 22, 1977, at site 0.15 mi (0.24 km) upstream and datum 9.90 ft (3.018 ) higher. REMARKS.--No estimated daily discharges during water year. Records fair. Some low-flow regulation by construction upstream. AVERAGE DISCHARGE.--20 years (1965-84), 35.1 cu ft/s (1.994 cu m/s), 26.78 in/yr (680 mm/yr), 25,430 acre-ft/yr (31.4 cu hm/yr); median of yearly mean discharges, 33 cu ft/s (0.93 cu m/s), 23,900 acre-ft/yr (29 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 22,400 cu ft/s (634 cu m/s), Sept. 16, 1975, gage height, 11.2 ft (3.41 m), site and datum then in use, from floodmarks, from rating curve extended above 150 cu ft/s (4.25 cu m/s) on basis of slope-area measurement of peak flow; minimum discharge, 2.2 cu ft/s (0.062 cu m/s), May 28, 1967. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 1,200 cu ft/s (34.0 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) Apr. 11 1830 1,760 49.8 8.93 2.722 May 18 Unknown *8,270 234 *14.64 4.462 Apr. 22 1645 1,520 43.0 8.52 2.597 Minimum discharge, 3.5 cu ft/s (0.099 cu m/s), Mar. 17. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 75 49 30 13 10 113 14 23 40 2 67 54 32 13 9.0 44 13 37 40 3 79 240 33 12 7.2 6.2 13 62 50 4 62 149 28 12 7.0 5.2 14 38 41 5 83 160 29 12 6.6 5.0 15 34 36 6 95 127 29 11 6.4 4.8 14 180 30 7 69 125 27 11 6.2 5.4 13 100 27 8 63 117 26 11 6.4 6.1 14 66 24 9 138 102 29 10 6.6 5.4 13 44 22 10 126 81 29 9.7 6.2 5.4 52 41 22 11 96 70 25 9.7 11 4.9 460 38 24 12 73 62 28 9.7 10 5.2 274 35 28 13 103 55 24 9.1 6.4 4.4 39 49 22 14 95 51 22 8.3 11 3.9 26 190 15 96 47 22 8.9 10 3.8 21 320 16 117 42 23 8.8 9.0 3.7 18 500 17 120 40 29 8.5 8.0 3.7 17 1000 18 95 41 22 8.3 7.2 28 17 2500 19 98 38 19 8.3 6.8 11 16 700 20 95 34 19 8.0 6.6 7.2 14 180 21 74 31 18 8.0 6.5 7.2 16 128 22 62 30 17 8.3 6.4 9.6 347 92 23 55 30 16 7.8 6.3 7.1 744 77 24 51 29 21 7.4 6.3 6.7 500 60 25 50 73 17 7.2 6.3 6.7 250 56 26 45 91 17 7.5 7.1 7.0 120 54 27 42 40 16 7.5 11 9.8 50 52 28 40 34 16 7.5 8.0 13 32 50 29 39 30 14 7.5 --- 9.4 29 48 30 41 29 14 10 18 25 45 31 37 --- 14 15 19 --- 43 TOTAL 2381 2101 705 296.0 215.5 389.8 3190 6842 MEAN 76.8 70.0 22.7 9.55 7.70 12.6 106 221 MAX 138 240 33 15 11 113 744 2500 MIN 37 29 14 7.2 6.2 3.7 13 23 CFSM 4.31 3.93 1.28 .54 .43 .71 5.96 12.4 IN. 4.98 4.39 1.47 .62 .45 .81 6.67 14.30 AC-FT 4720 4170 1400 587 427 773 6330 13570 CAL YR 1984 TOTAL 10385.4 MEAN 28.4 MAX 240 MIN 4.1 CFSM 1.60 IN. 21.70 AC-FT 20600 RIO BUCANA BASIN 237 50114000 RIO CERRILLOS NEAR PONCE, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1964 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 15... 1046 48 285 8.60 22.0 0.7 8.7 100 <10 K130 410 JAN 1985 30... 0935 10 311 8.50 20.0 15 9.4 104 25 K180 60 MAR 19... 1030 10 293 8.30 24.5 8.5 9.1 110 14 86 320 MAY 29... 1160 44 302 8.40 28.0 6.0 7.4 95 <10 290 480 AUG 07... 1000 18 264 8.70 27.5 5.2 8.6 109 <10 K2100 74 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIE- (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) NOV 1984 15... 130 7 40 6.8 9.8 0.4 1.0 121 17 JAN 1985 30... 140 2 44 7.6 12 0.5 0.9 139 <0.5 18 MAR 19... 128 MAY 29... 130 6 41 7.0 11 0.4 1.1 125 <0.5 20 AUG 07... 108 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) NOV 1984 15... 8.1 <0.1 22 180 23 2 <0.01 0.80 0.13 JAN 1985 30... 9.3 0.1 21 200 5.3 33 <0.01 0.30 0.01 0.49 MAR 19... 9 MAY 29... 8.2 0.1 22 190 112 <0.01 0.60 0.02 0.08 AUG 07... 8 <0.01 0.30 0.04 0.26 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) NOV 1984 15... <0.1 <0.01 JAN 1985 30... 0.6 0.8 3.5 0.07 <1 <100 <20 2 7 <10 MAR 19... MAY 29... 0.1 0.7 3.1 0.02 <1 100 <20 <1 5 10 AUG 07... 0.3 0.6 2.7 0.03 K = non-ideal count RIO BUCANA BASIN 238 50114000 RIO CERRILLOS NEAR PONCE, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE BEADLE BRABLE 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 1984 15... JAN 1985 30... 1900 1 80 <0.1 <1 <1 20 <0.01 2 0.02 MAR 19... <0.1 MAY 29... 4000 6 180 <0.1 <1 <1 30 <0.01 12 0.01 AUG 07... RIO PORTUGUES BASIN 239 50115000 RIO PORTUGUES NEAR PONCE, PR LOCATION.--Lat 18°04'45", long 66°38'01", Hydrologic Unit 21010004, on right bank 30 ft (9 m) upstream from bridge on Highway 504, 0.2 mi (0.3 km) upstream from small unnamed tributary, 4.4 mi (7.1 km) upstream from Rio Chiquito, and 4.7 mi (7.6 km) north of Plaza Degetau in Ponce. DRAINAGE AREA.--8.82 sq mi (22.84 sq km). 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.--Estimated daily discharges: June 5-10, July 9 to Aug. 13. Records fair except those for estimated daily discharges, which are poor. Some low-flow regulation due to unknown activity upstream. AVERAGE DISCHARGE.--21 years (1965-85), 18.2 cu ft/s (0.515 cu m/s), 28.02 in/yr (712 mm/yr), 13,190 acre-ft/yr (16.3 cu hm/yr); median of yearly mean discharges, 18 cu ft/s (0.51 cu m/s), 13,000 acre-ft/yr (16 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,100 cu ft/s (371 cu m/s), Sept. 16, 1975, gage height, 10.1 ft (3.08 m), from floodmarks at downstream side of bridge, from rating curve extended above 150 cu ft/s (4.25 cu m/s) on basis of slopo-area monsuromont of peak flow; minimum discharge, 1.0 ou ft/s (0.028 cu m/s), May 29, 1973. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 800 cu ft/s (22.7 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Oct. 9 1300 1,160 Nov. 3 1130 1,860 May 15 2030 853 32.9 6.45 1.966 52.7 7.88 2.402 24.2 5.71 1.740 May 17 0245 921 26.1 5.88 1.792 May 18 1145 *3,050 86.4 *9.87 3.008 Minimum discharge, 2.4 cu ft/s (0.068 cu m/s), Mar. 15, 16, 17, 18. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES OCT NOV 37 23 23 32 31 553 21 155 110 185 94 110 47 112 38 80 216 63 113 43 74 35 38 30 64 27 48 26 65 25 75 24 97 23 63 22 44 19 46 17 35 16 28 15 24 14 20 13 21 75 19 84 18 33 17 23 16 21 25 19 17 --- 1584 1917 51.1 63.9 216 553 16 13 5.79 7.24 6.68 8.09 3140 3800 DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 27 8.9 4.7 16 3.2 5.1 14 5.8 7.3 9.5 20 8.8 4.9 12 3.4 4.3 13 8.8 5.0 8.0 18 8.8 4.7 4.8 3.3 6.2 16 9.1 4.6 7.5 16 9.3 4.4 4.2 3.3 4.4 15 6.4 4.5 7.1 16 8.8 4.6 3.8 3.2 4.2 13 6.1 10 28 15 9.0 5.0 3.5 2.9 8.2 12 5.8 6.0 20 14 9.2 4.5 5.0 3.1 23 11 5.6 4.3 21 14 8.5 4.6 5.1 3.0 7.5 11 5.5 4.2 21 16 8.5 4.9 4.3 2.6 5.8 10 5.3 3.9 16 14 9.4 5.3 3.8 4.9 4.7 10 5.2 5.2 50 14 12 7.8 3.1 48 3.9 9.6 5.3 16 30 15 11 5.7 3.5 19 3.9 9.0 5.2 12 26 12 12 5.2 3.1 5.9 4.1 8.7 5.0 20 48 11 12 9.7 2.8 4.5 4.5 8.4 4.8 28 50 11 12 8.6 2.7 4.0 157 8.1 13 17 34 13 13 6.6 2.4 3.9 303 7.8 7.1 11 26 18 12 5.4 2.4 3.9 390 7.9 12 9.0 24 13 11 4.7 18 3.9 982 12 8.0 8.1 22 12 9.4 4.5 6.7 3.9 104 9.4 6.3 7.5 20 12 9.0 4.5 4.1 3.9 40 7.7 6.1 7.2 19 11 9.3 4.5 6.4 4.7 28 7.4 6.0 7.1 19 11 8.9 4.2 5.1 5.7 23 7.3 5.9 7.0 19 11 7.3 4.2 3.6 25 20 9.9 5.7 6.7 19 13 6.7 3.9 3.4 21 18 12 5.6 6.6 93 11 6.5 4.0 3.1 30 16 11 5.5 6.4 39 9.8 5.9 4.4 3.1 26 16 7.6 5.4 6.6 26 9.0 5.3 5.2 4.0 15 14 7.0 5.3 15 53 9.0 5.0 4.9 3.6 7.5 15 6.4 5.2 8.3 31 9.0 5.0 --- 2.8 6.1 15 6.1 5.2 6.8 21 9.0 4.8 3.5 5.3 14 6.0 5.1 14 20 9.3 4.6 3.8 --- 14 --- 5.0 14 --- 413.1 271.9 145.6 153.7 280.1 2258.8 294.3 196.3 289.3 827.1 13.3 8.77 5.20 4.96 9.34 72.9 9.81 6.33 9.33 27.6 27 13 9.7 18 48 982 16 13 28 93 9.0 4.6 3.9 2.4 2.6 3.9 6.0 4.8 3.9 7.1 1.51 .99 .59 .56 1.06 8.27 1.11 .72 1.06 3.13 1.74 1.15 .61 .65 1.18 9.53 1.24 .83 1.22 3.49 819 539 289 305 556 4480 584 389 574 1640 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN CFSM IN. AC-FT CAL YR 1984 TOTAL 7126.8 MEAN 19.5 MAX 553 MIN 1.2 CFSM 2.21 IN. 30.06 AC-FT 14140 WTR YR 1985 TOTAL 8631.2 MEAN 23.6 MAX 982 MIN 2.4 CFSM 2.68 IN. 36.40 AC-FT 17120 240 RIO PORTUGUES BASIN 60115000 RIO PORTUGUES NEAR PONCE, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1964 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 15... 1760 25 290 8.40 23.0 1.6 8.5 101 15 K2200 10000 JAN 1985 30... 1530 4.9 306 8.80 22.5 0.5 9.0 105 23 K160 220 MAR 19... 1600 5.7 270 8.50 25.0 1.0 8.0 98 12 K660 520 MAY 29... 1640 15 289 8.60 26.0 1.7 7.5 94 <10 230 820 AUG 07... 1600 4.6 277 8.70 28.0 3.3 8.2 106 <10 K180 K180 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 CACO3) CACO3 AS CA) AS MG) AS NA) AS K) CACO3 AS 3) AS 304) AS CL) NOV 1984 15... 130 0 42 6.6 9.6 0.4 1.1 132 7.9 8.9 JAN 1985 30... 140 45 7.7 11 0.4 1.1 148 <0.5 8.4 10 MAR 19... 122 MAY 29... 120 39 6.7 9.7 0.4 1.4 130 <0.5 8.4 8.3 AUG 07... 125 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) 8102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) NOV 1984 15... <0.1 22 180 12 2 <0.01 1.40 0.17 0.13 JAN 1985 30... <0.1 21 190 2.6 1 <0.01 0.60 <0.01 MAR 19... 3 MAY 29... 0.1 19 170 6.9 7 0.95 0.06 1.00 <0.01 AUG 07... 4 0.89 <0.01 0.70 0.03 0.37 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 1984 15... 0.3 1.7 7.5 <0.01 JAN 1985 30... 0.3 0.9 4.0 0.04 <1 <100 <20 2 5 <10 MAR 19... MAY 29... 0.2 1.2 5.3 <0.01 <1 100 <20 1 3 <10 AUG 07... 0.4 1.1 4.9 0.03 K = non-ideal count RIO PORTUGUES BASIN 241 50115000 RIO PORTUGUES NEAR PONCE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS 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 1984 15... JAN 1985 30... 110 1 20 <0.1 <1 <1 20 <0.01 2 0.03 MAR 19... 0.3 MAY 29... 420 2 30 <0.1 <1 <1 20 <0.01 2 0.02 AUG 07... I I 242 RIO PORTUGUES BASIN 60116200 RIO PORTUGUES AT PONCE, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°00'20", long 66°36'28", 1,300 ft (400 ) south of Las Americas Avenue Bridge, 1.2 mi (1.9 km) south of CSC 60115900, 0.8 i (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 1984 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIE- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 16... 0846 26 471 8.20 21.5 30 9.9 112 20 26000 K1200 JAN 1985 29... 1600 2.9 628 7.40 30.0 4.0 5.1 67 26 K66000 690 MAR 18... 1755 19 374 7.90 27.0 16 5.2 65 15 K270000 33000 MAY 28... 1645 19 380 8.50 33.0 7.5 9.5 132 <10 22000 k1500 AUG 06... 1645 20 455 7.80 30.0 16 6.4 84 17 180000 K2800 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- DIE- (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 CACO3) CACO3 AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS SO4) AS CL) NOV 1984 16... 190 17 57 11 25 0.8 1.7 171 39 26 JAN 1986 29... 220 12 65 13 50 2 2.3 204 <0.5 69 44 MAR 18... 149 MAY 28... 150 12 43 9.6 29 1 2.2 135 <0.5 39 26 AUG 06... 141 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, D1S- CONSTI- DIE- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIE- (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 1984 16... 0.1 21 280 20 58 1.88 0.02 1.90 0.23 0.17 JAN 1985 29... 0.3 21 390 3.0 8 1.85 0.15 2.00 0.44 0.56 MAR 18... 2 MAY 28... 0.1 18 250 44 0.77 0.03 0.80 0.07 0.33 AUG 06... 27 0.46 0.04 0.50 0.14 0.66 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 BRABLE KIMBLE 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 1984 16... 0.4 2.3 10 0.04 JAN 1985 29... 1.0 3.0 13 0.29 <1 100 60 2 4 <10 MAR 18... MAY 28... 0.4 1.2 5.3 0.10 <1 <100 60 <1 12 10 AUG 06... 0.8 1.3 5.8 0.22 K = non-ideal count RIO PORTUGUES BASIN 243 50116200 RIO PORTUGUES AT PONCE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RRCOV- RRCOV- 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 1984 16... JAN 1985 29... 420 1 250 <0.1 <1 <1 20 <0.01 (1 0.06 MAR 18... 0.1 MAY 28... 1300 9 120 <0.1 <1 <1 20 <0.01 10 0.16 AUG 06... 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) AUG 1985 06... 1645 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 0.03 <0.01 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) (UO/L) (UG/L) (UO/L) (UG/L) (UG/L) (UG/L) AUG 1985 06... <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- TOE- 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) (UO/L) AUG 1985 06... <0.01 <0.01 <0.01 <0.01 <0.1 <0.1 <1 <0.01 I RIO GUAYANILLA BASIN 244 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 fro Quebrada Consejo, 1.8 mi (2.9 km) north-northwest from Plaza de Guayanilla. DRAINAGE AREA.--18.9 sq mi (49.0 sq km). 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. 1-17. Records fair exoept those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 14,700 cu ft/s (416 cu m/a), Sept. 12, 1982, gage height, 20.4 ft (6.21 m) from floodmarka, from rating curve extended above 100 cu ft/s (2.83 cu m/s) on basis of step- backwater analysis and indirect measurement of peak flow; minimum discharge, 1.8 cu ft/s (0.051 cu m/s), Apr. 17-19, 1981. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 800 cu ft/a (22.7 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Nov. 3 0815 927 26.2 9.60 2.926 May 16 0845 871 24.7 9.48 2.890 Nov. 25 1945 852 24.1 9.44 2.877 May 17 0100 1,570 44.5 10.85 3.307 Nov. 27 1545 936 26.5 9.62 2.932 May 18 0730 1,280 36.2 10.34 3.152 May 15 2245 *1,640 46.4 *10.98 3.347 Sept. 14 1315 1,010 28.6 9.78 2.981 Minimum daily discharge, 2.9 cu ft/s (0.082 cu m/s), Apr. 20. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 12 53 43 10 11 13 4.9 5.7 20 7.6 5.9 5.8 2 11 58 42 10 11 6.6 4.8 5.3 20 8.1 6.3 5.2 3 52 459 37 9.6 11 6.0 4.5 5.2 21 8.2 5.6 5.0 4 21 216 33 9.4 10 8.5 4.5 5.1 20 7.4 5.0 4.9 5 20 210 30 9.2 10 6.5 5.1 4.8 18 6.9 5.3 9.5 6 28 129 29 9.1 11 5.9 4.1 4.8 17 6.6 6.3 16 7 17 108 28 8.9 11 6.6 4.1 7.8 17 6.2 6.4 16 8 13 99 27 8.6 11 12 4.1 5.4 16 6.2 5.6 13 9 190 92 42 8.7 12 8.4 3.9 5.0 16 6.3 6.9 7.3 10 70 72 33 8.3 12 8.6 3.8 4.8 16 6.5 5.3 5.9 11 28 72 29 9.4 18 7.3 4.1 4.7 14 6.4 9.3 5.9 12 16 68 24 9.1 16 6.6 5.3 4.5 14 6.2 11 7.2 13 12 58 22 8.4 8.9 6.4 3.7 4.5 13 6.2 8.5 21 14 20 49 21 8.2 9.8 6.1 3.5 4.5 12 6.3 6.6 207 15 32 46 19 8.3 13 5.9 3.3 124 12 10 9.8 75 16 280 43 20 8.5 10 5.7 3.3 316 12 10 6.1 26 17 112 43 20 8.6 11 5.8 3.3 455 12 8.2 5.6 17 18 85 41 18 9.6 9.7 13 3.3 713 12 8.7 5.0 15 19 66 40 16 9.6 9.5 8.2 3.1 241 12 7.1 5.0 12 20 95 38 16 9.5 11 5.9 2.9 152 12 6.9 11 10 21 168 37 15 9.8 11 5.7 3.2 93 11 6.9 9.4 10 22 76 36 14 10 10 5.7 4.5 59 11 6.2 6.0 13 23 55 36 14 11 9.9 5.5 6.3 45 9.6 7.4 5.3 8.9 24 47 34 16 11 12 5.5 19 38 9.4 8.7 4.9 125 25 52 186 14 12 15 5.2 30 34 9.6 6.4 4.7 114 26 44 167 13 12 7.5 6.1 42 30 9.3 5.6 4.9 54 27 60 164 13 11 10 7.4 14 27 8.8 5.8 8.0 61 28 43 76 12 10 17 5.0 7.5 26 8.6 5.9 7.2 37 29 38 52 11 9.8 --- 5.0 6.4 24 8.4 5.9 5.5 21 30 47 44 11 10 8.5 5.9 22 7.6 5.6 5.9 19 31 53 --- 11 10 6.3 --- 21 --- 5.3 10 --- TOTAL 1863 2826 693 297.6 319.3 218.9 218.4 2492.1 399.3 215.6 208.3 947.6 MEAN 60.1 94.2 22.4 9.60 11.4 7.06 7.28 80.4 13.3 6.95 6.72 31.6 MAX 280 459 43 12 18 13 42 713 21 10 11 207 MIN 11 34 11 8.2 7.5 5.0 2.9 4.5 7.6 5.3 4.7 4.9 CFSM 3.18 4.98 1.19 .51 .60 .37 .39 4.25 .70 .37 .36 1.67 IN. 3.67 5.56 1.36 .59 .63 .43 .43 4.91 .79 .42 .41 1.87 AC-FT 3700 5610 1370 590 633 434 433 4940 792 428 413 1880 CAL YR 1984 TOTAL 8410.8 MEAN 23.0 MAX 459 MIN 2.7 CFSM 1.22 IN. 16.55 AC-FT 16680 WTR YR 1985 TOTAL 10699.1 MEAN 29.3 MAX 713 MIN 2.9 CFSM 1.55 IN. 21.06 AC-FT 21220 RIO GUAYANILLA BASIN 50124200 RIO GUAYANILLA NEAR GUAYANILLA, P.H.--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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, 07 0910 29 455 22.0 MAR, 08 1132 10 426 25.0 JAN, 18 0912 10 430 22.0 SEP, 11 1628 5.8 360 30.0 FEB, 14 1010 8.9 440 23.0 245 I 246 RIO GUAYANILLA BASIN 50124700 RIO GUAYANILLA AT CENTRAL RUFINA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°00'40", long 66046'49", at dirt road bridge, 0.7 si (1.1 km) from mouth, 0.9 ski (1.4 km) east of Central Rufina and 0.9 i (1.4 km) southeast of Guayanilla. DRAINAGE AREA.--22.8 sq mi (69.1 sq km). PERIOD OF RECORD.--Water years 1960-65, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 16... 1400 34 480 8.60 27.0 36 9.1 114 <10 1110000 5800 JAN 1985 31... 0830 1.6 742 7.80 22.0 2.5 4.3 49 43 K2000 1000 MAR 20... 0915 2.3 940 7.70 28.0 2.5 1.3 17 65 1760000 260000 MAY 30... 1000 22.0 451 8.50 28.5 2.0 9.5 122 K600 4900 AUG 08... 0946 1.3 910 7.65 29.5 4.1 2.4 32 67 30000 K79000 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/I. AS (MG/L (MG/L (MG/L RATIO (MG/L MU/L AS (MG/L (MU/L (MU/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) NOV 1984 16... 220 32 57 18 19 0.6 1.6 184 49 24 JAN 1985 31... 300 14 84 22 52 1 4.1 286 <0.5 92 55 MAR 20... 303 MAY 30... 200 30 52 17 18 0.6 1.5 170 <0.6 44 21 AUG 08... 305 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIE- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MU/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L A9 SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) 9IO2) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) NOV 1984 16... 0.1 20 300 27 47 0.89 0.01 0.90 0.75 0.15 JAN 1985 31... 0.2 22 500 2.2 17 0.38 0.12 0.60 10.0 6.0 MAR 20... 12 MAY 30... <0.1 19 270 4 0.17 0.03 0.20 0.99 1.1 AUG 08... 8 0.89 0.06 <0.10 16.0 1.0 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 1984 16... 0.9 1.8 8.0 0.30 JAN 1985 31... 16 17 73 1.70 2 100 110 2 9 20 MAR 20... MAY 30... 2.1 2.3 10 0.24 <1 100 40 <1 4 <10 AUG 08... 17 1.2 <0.01 K = non-ideal count RIO GUAYANILLA BASIN 247 50124700 RIO GUAYANILLA AT CENTRAL RUFINA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 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 (UGIL (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 1984 16... JAN 1985 31... 1800 1 290 0.2 <1 <1 50 <0.01 6 0.21 MAR 20... 0.1 MAY 30... 190 <1 30 <0.1 <1 <1 30 <0.01 10 0.08 AUG 08... CHLOR- DI- DI- PCB, ALDRIN, DANE, DDD, DDB, DDT, AZINON, ELDRIN DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UM) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) AUG 1986 08... 0945 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 0.16 <0.01 HEPTA- METH- ENDO- HEPTA- CHLOR MAI.A- 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) AUG 1985 08... <0.01 <0.01 <0.01 <0.01 <0.01 0.01 0.03 <0.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION, THION, MIREX, THION, CHLOR. THANK 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) AUG 1986 08... <0.01 <0.01 <0.01 <0.01 <0.1 <0.1 <1 <0.01 248 RIO YAUCO BASIN 50126150 RIO YAUCO ABOVE DIVERSION MONSERRATS NEAR YAUCO, PR LOCATION.--Lat 18°02'58", long 66°50'30", Hydrologic Unit 21010004, on right bank off Highway 375, about 300 ft (91 m) upstream from diversion Monserrate, 0.1 mi (0.2 km) downstream from Quebrada de las Quebradas, 0.9 mi (1.4 km) downstream from Rio Duey, and 1.0 (1.6 km) northeast of Yauco Plaza. DRAINAGE AREA.--27.2 sq mi (70.4 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--November 1976 to Jan. 23, 1985 (discontinued). GAGE.--Water-stage recorder. Elevation of gage is 115 ft (35 m), from topographic map. REMARKS.--Estimated daily discharges: Oct. 16, 17, 20, and 21. Records poor. Flow affected by numerous diversions into and out of the basin. AVERAGE D1SCHARGE.--7 years (1978-84), 21.8 cu ft/s (0.617 cu m/s), 10.88 in /yr (276 mm/yr), 15,790 acre-ft/yr (19.5 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 10,500 cu ft/s (297 cu m/s), Aug. 31, 1979, gage height, 9.83 ft (2.996 m) from floodmark, from rating curve extended above 300 cu ft/a (8.50 cu m/s) on basis of step-backwater analysis; minimum daily discharge, 0.2 cu ft/a (0.006 cu m/s), June 30, 1978. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 1,000 cu ft/s (28.3 cu m/s) and maximum (8): Discharge Gage height Date Time (cu ft/a) (cu m/s) (ft) (s) Nov. 3 1015 12,020 57.2 S5.30 1.615 Minimum daily discharge, 4.5 cu ft/a (0.13 cu m/s), Oct. 2. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 5.1 59 20 7.5 2 4.5 29 18 7.1 3 21 744 17 7.1 4 8.5 290 16 6.9 5 8.2 186 15 6.7 6 7 8 9 10 11 6.8 5.2 75 28 138 121 118 112 99 15 15 15 49 24 6.7 6.7 6.6 6.3 6.3 11 12 13 14 15 11 6.3 4.7 8.1 13 92 87 81 73 65 21 16 15 12 12 6.6 6.7 6.7 6.3 6.0 16 17 18 19 20 110 45 56 16 61 60 53 47 43 41 12 13 12 12 12 5.8 5.5 5.6 5.5 5.5 21 22 23 24 25 97 19 10 7.5 16 37 34 33 30 28 11 11 9.7 12 9.9 5.5 5.5 5.5 --- 26 27 28 29 30 31 7.9 11 11 5.6 17 62 28 27 27 25 23 --- 9.4 9.1 8.9 8.5 7.8 7.6 TOTAL MEAN MAX MIN CFSM IN. AC-FT 768.4 24.8 110 4.5 .91 1.05 1520 2830 94.3 744 23 3.47 3.87 5610 445.9 14.4 49 7.6 .53 .61 884 CAL YR 1984 TOTAL 7489.6 MEAN 20.5 MAX 744 MIN 1.7 CFSM .75 IN. 10.24 AC-FT 14860 RIO YAUCO BASIN 249 50126150 RIO YAUCO ABOVE DIVERSION MONSERRATE NEAR YAUCO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMBOS) (DEG C) (CFS) (UMHOS) (DEG C) DEC, 06 0915 14 440 23.0 JAN, 23 0825 5.5 430 21.0 I I I 250 RIO YAUCO BASIN 50128000 RIO YAUCO NEAR YAUCO, PR LOCATION.--Lat 17°59'19", long 66°49'55", Hydrologic Unit 21010004, on right bank at downstream aide of bridge on Highway 335, 0.8 mi (1.3 km) northwest of Central San Francisco and 3.4 mi (5.5 km) southeast of junction of Highways 335 and 2 in Yauco. DRAINAGE AREA.--45.6 sq mi (117.8 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1960 (discharge measurements only), May 1961 to December 1964, November 1976 to January 1985 (discontinued). GAGE.--Water-stage recorder. Elevation of gage is 15.14 ft (4.615 m) above mean sea level, datum of 1929. Prior to Oct. 1, 1978; at same site at datum 4.0 ft (1.219 m) higher. REMARKS.--No estimated daily discharges during water year. Records poor. Natural flow of stream is affected by transbasin diversions, storage reservoirs, power development, diversions for irrigation and municipal use, and return flow from irrigated areas. AVERAGE DISCHARGE.--7 years (1978-84), 19.5 cu ft/a (0.552 cu m/s), 5.82 in/yr (148 mm/yr), 14,130 acre-ft/yr (17.4 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 10,300 cu ft/s (292 cu m/s), Sept. 13, 1982, gage height, 15.0 ft (4.57 ), from floodmarks, fro rating curve extended above 2,000 cu ft/s (56.6 cu /s) on basis of step-backwater analysis and indirect measurement of peak flow; no flow many days in most years. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 1,000 cu ft/a (28.3 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (a) Nov. 3 2115 *3,960 112 13.88 4.231 Minimum discharge, 2.1 cu ft/s (0.061 cu m/s), Jan. 21, 22. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 14 136 23 6.8 2 13 34 23 6.3 3 40 1720 22 6.2 4 36 1330 19 5.5 5 13 515 18 5.2 6 28 268 17 4.8 7 17 160 16 4.7 8 11 125 16 4.4 9 176 113 107 3.8 10 96 79 30 3.6 11 32 61 23 4.0 12 18 50 17 4.0 13 12 43 15 3.9 14 19 38 14 3.7 15 12 33 14 3.3 16 217 29 14 2.9 17 86 27 14 2.8 18 116 24 12 2.7 19 31 22 12 2.6 20 81 20 11 2.7 21 187 19 10 2.4 22 48 17 9.6 2.2 23 22 17 9.5 24 16 16 12 25 39 141 10 26 23 258 9.3 27 23 140 8.6 28 25 67 7.9 29 16 35 7.1 30 17 27 7.1 31 87 --- 7.3 TOTAL 1571 5564 535.4 MEAN 50.7 185 17.3 MAX 217 1720 107 MIN 11 16 7.1 CFSM 1.11 4.07 .38 IN. 1.28 4.55 .44 AC-FT 3120 11040 1060 CAL YR 1984 TOTAL 13755.68 MEAN 37.6 MAX 1720 MIN .20 CFSM .83 IN. 11.25 AC-FT 27280 RIO YAUCO BASIN 251 50128000 RIO YAUCO NEAR YAUCO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1210 17 690 25.5 JAN, 22 1032 2.2 768 23.5 I RIO LOCO BASIN 252 60129700 RIO LOCO AT GUANICA, PR WATER-QUALITY RECORDS LOCATION.--Lat 17°58'33", long 66°54'52", 0.6 i (1.0 km) northwest of Guanloa 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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIE- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIE- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED. SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 09... 1425 371 390 7.90 25.0 17 6.3 77 18 K1300 K1300 JAN 1985 31... 1245 0.0 14000 7.90 25.5 3.5 5.0 64 2800 10 MAR 20... 1210 0.0 390 8.00 26.0 9.5 6.0 74 15 K1300 K1100 MAY 30... 1230 0.0 632 8.00 28.5 5.0 6.1 78 <10 K1700 950 AUG 8... 1200 0.0 14500 7.80 32.0 5.7 4.7 67 69 K610 320 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CIILO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIE- DIE- DIE- SORP- DIS- TOTAL SULFIDE DIE- DIE- , (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 CACO3) CACO3 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) NOV 1984 9... 150 1 30 18 21 0.8 2.7 148 20 22 JAN 1985 31... 1500 1200 120 290 2100 24 62 302 0.5 600 3800 MAR 20... 148 MAY 30... 220 42 27 53 2 2.8 232 <0.5 36 52 AUG 08... 259 -- 4600 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIE- 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 MINDED (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 1984 09... <0.1 22 220 225 33 0.77 0.03 0.80 0.15 1.0 JAN 1985 31... 0.4 26 7200 7 0.27 0.03 0.30 0.21 0.49 MAR 20... 17 MAY 30... 0.2 25 380 32 0.67 0.03 0.70 0.06 0.24 AUG 8... 30 0.09 0.01 0.10 0.07 0.43 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) NOV 1984 9... 1.2 2.0 8.9 0.20 JAN 1985 31... 0.7 1.0 4.4 0.23 2 100 1100 1 6 20 MAR 20... -- MAY 30... 0.3 1.0 4.4 0.14 <1 100 100 <1 22 <10 AUG 08... 0.5 0.6 2.7 0.09 K = non-ideal oount RIO LOCO BASIN 253 50129700 RIO LOCO AT GUANICA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 HO) AS SE) A8 AG) AS ZN) AS CN) (UG/L) (MG/L) NOV 1984 09... JAN 1985 31... 1400 3 230 0.2 1 1 30 0.01 1 0.28 MAR 20... <0.1 MAY 30... 1600 10 100 <0.1 <1 <1 30 <0.01 8 0.03 AUG 08... CHLOR- DI- DI- PCB, ALDRIN, DANE, DDD, DDB, 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) AUG 1985 08... 1200 <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, ET111ON, 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) AUG 1985 08... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- METHYL METHYL LEWES, PARA- TRI- PARA- POLY- PER- TOY- 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) AUG 1985 08... <0.01 <0.01 <0.01 <0.01 <0.1 <0.1 <1 <0.01 'N)MAYAGUE2 Yaoiien basin 7› Rio Grande de Aliosco basin .. ' < Rio fo. R/e )1 Rosario /Drainage boundary Island 136 ): • divide 0 HORMIGU s / R(obaYsaiunco Laguna 0qtIO ..loyudo (11 GuonajTho 1336 \'‘ ( 6 1,0 a A 0 ROJO 132010 ( Map area SAN GERMAN GRANoc- 6s4'oirol 0 sio30 Rilo Loco basin EXPLANATION ‘., AJ all. do z 00#90 A1380 SURFACE—WATER STATION AND NUMBER Principal 2 ,1300 LOW—FLOW STATION Boqu AND NUMBER 00 QUALITY—OF—WATER STATION Ca" CLarlavgla 143 V1297 AND NUMBER Ca-, 143 WELL AN WELL NUMBER • GUANICA SEA CARIBBEAN 4 5 KILOMETERS o I 2 I i o 3 4 5 MILES Figure 25.--Rio Guanajibo basin. 256 LACUNA 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 mi (1.0 km) south of Hacienda Desengano, and 4.3 mi (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 map. REMARKS.--Record lost: Oct. 17-22. 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, 15.39 ft (4.691 al), Nov. 3; minimum elevation, 7.43 ft (2.265 m) July 29. ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 2400 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 8.63 8.96 8.78 8.43 8.35 8.19 7.96 7.53 8.41 7.47 7.48 8.23 2 8.59 8.88 8.72 8.43 8.34 8.19 7.95 7.50 8.40 7.48 7.48 8.17 3 8.63 15.06 8.68 8.43 8.33 8.19 7.98 7.49 8.36 7.48 7.48 8.13 4 8.61 13.30 8.64 8.43 8.34 8.18 8.03 7.49 8.35 7.48 7.48 8.08 5 8.64 12.12 8.60 8.43 8.33 8.17 8.04 7.49 8.31 7.48 7.76 9.14 6 8.64 11.43 8.56 8.42 8.30 8.17 8.02 7.49 8.33 7.48 8.01 9.33 7 8.66 10.92 8.56 8.41 8.28 8.16 8.01 7.49 8.29 7.48 8.15 9.17 8 8.66 10.43 8.78 8.40 8.26 8.15 8.01 7.49 8.28 7.48 8.10 8.98 9 8.66 9.96 9.22 8.40 8.24 8.16 7.99 7.49 8.23 7.48 8.02 8.79 10 8.66 9.61 9.22 8.41 8.22 8.14 7.98 7.49 8.19 7.48 7.91 8.71 11 8.64 9.35 9.11 8.41 8.26 8.13 7.93 7.49 8.15 7.48 7.77 9.16 12 8.61 9.17 8.99 8.41 8.25 8.12 7.81 7.49 8.12 7.48 7.77 9.54 13 8.56 9.03 8.86 8.41 8.25 8.09 7.68 7.49 8.08 7.48 7.90 10.45 14 8.53 8.92 8.76 8.41 8.25 8.07 7.61 7.49 8.05 7.48 7.96 10.42 15 8.50 8.84 8.69 8.40 8.25 8.05 7.56 7.52 8.00 7.48 7.93 10.23 16 8.48 8.75 8.64 8.40 8.24 8.03 7.56 8.38 7.92 7.48 7.88 10.00 17 A 8.70 8.60 8.39 8.23 8.00 7.53 9.90 7.85 7.48 7.83 9.83 18 8.66 8.56 8.39 8.24 8.03 7.54 10.15 7.80 7.48 7.79 9.59 19 8.63 8.55 8.38 8.24 8.02 7.51 10.12 7.71 7.48 7.67 9.41 20 A 8.60 8.52 8.39 8.23 8.04 7.49 9.91 7.64 7.47 7.61 9.27 21 A 8.57 8.49 8.40 8.22 8.03 7.49 9.72 7.58 7.47 7.57 9.15 22 A 8.54 8.48 8.39 8.21 8.02 7.51 9.51 7.56 7.47 7.52 9.02 23 9.31 8.52 8.48 8.39 8.22 7.95 7.54 9.34 7.52 7.47 7.48 8.63 24 9.11 8.51 8.48 8.38 8.21 7.89 7.59 9.18 7.49 7.47 7.47 8.78 25 9.02 8.56 8.48 8.37 8.21 7.85 7.65 9.05 7.49 7.47 7.47 8.79 26 8.93 8.86 8.47 8.36 8.21 7.91 7.66 8.92 7.49 7.47 7.51 8.69 27 9.59 9.09 8.45 8.37 8.19 7.86 7.62 8.81 7.49 7.48 7.60 8.65 28 9.87 9.07 8.44 8.37 8.21 7.84 7.60 8.71 7.49 7.47 8.48 8.60 29 9.68 8.97 8.43 8.37 --- 7.81 7.59 8.62 7.49 7.48 8.50 8.56 30 9.35 8.86 8.43 8.36 7.77 7.56 8.54 7.49 7.48 8.41 8.53 31 9.12 --- 8.43 8.36 8.04 --- 8.46 --- 7.48 8.35 --- MEAN 9.56 8.65 8.40 8.25 8.04 7.73 8.38 7.92 7.48 7.82 9.07 MAX 15.06 9.22 8.43 8.35 8.19 8.04 10.15 8.41 7.48 8.50 10.45 MIN 8.51 8.43 8.36 8.19 7.77 7.49 7.49 7.49 7.47 7.47 8.08 A No gage-height record. 257 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 ml (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.--Estimated daily discharges: Oct. 17 - 22. Records fair. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,290 cu ft/s (36.5 cu m/s), Nov. 3, 1984, gage height, 15.39 ft (4.691 m), from rating curve extended above 50 cu ft/s (1.42 cu m/s) on basis of step-backwater analysis; no flow part or all of each day Mar 16-30, Apr. 12 to May 15, June 20 to Aug. 27, Sept. 3-4, 1985. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 60 cu ft/s (1.70 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Nov. 3 1645 *1,290 36.5 *15.39 4.691 Minimum discharge, no flow part or all of each day Mar. 16-30, Apr. 12 to May 15, June 20 to Aug. 27, Sept. 3-4. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 5.3 11 8.0 2.2 1.5 .38 .12 .00 2.9 .00 .00 .19 2 4.6 9.0 6.9 2.2 1.4 .34 .05 .00 2.7 .00 .00 .01 3 4.9 636 6.2 2.2 1.3 .29 .08 .00 2.6 .00 .00 .00 4 4.7 757 5.7 2.2 1.4 .28 .16 .00 2.4 .00 .00 .00 5 4.8 332 5.1 2.1 1.4 .24 .20 .00 2.3 .00 .00 4.8 6 5.0 174 4.5 2.1 1.1 .22 .20 .00 2.2 .00 .00 18 7 5.2 106 4.2 2.0 .92 .21 .19 .00 2.1 .00 .13 15 8 5.4 69 4.8 1.8 .79 .18 .15 .00 2.0 .00 .14 11 9 5.4 44 13 1.7 .70 .17 .14 .00 1.8 .00 .02 6.1 10 5.3 29 16 1.7 .58 .16 .14 .00 1.6 .00 .00 3.4 11 5.2 20 14 1.8 .58 .12 .07 .00 1.3 .00 .00 5.1 12 4.9 16 12 1.7 .68 .10 .00 .00 1.1 .00 .00 21 13 4.3 13 9.4 1.7 .73 .05 .00 .00 .94 .00 .00 35 14 3.9 11 7.6 1.7 .73 .03 .00 .00 .81 .00 .00 56 15 3.4 9.3 6.3 1.7 .73 .01 .00 .00 .65 .00 .00 49 16 3.2 8.1 5.4 1.5 .70 .00 .00 .46 .45 .00 .00 41 17 99 7.1 4.8 1.5 .65 .00 .00 22 .23 .00 .00 33 18 580 6.4 4.3 1.4 .65 .00 .00 35 .11 .00 .00 27 19 220 5.9 4.0 1.4 .70 .00 .00 43 .04 .00 .00 21 20 90 5.3 3.7 1.5 .71 .00 .00 37 .00 .00 .00 17 21 50 4.9 3.3 1.7 .65 .00 .00 30 .00 .00 .00 14 22 30 4.5 3.1 1.8 .59 .00 .00 24 .00 .00 .00 11 23 18 4.3 3.0 1.6 .58 .00 .00 19 .00 .00 .00 6.2 24 15 4.1 3.0 1.5 .51 .00 .00 16 .00 .00 .00 5.9 25 11 4.1 2.9 1.4 .49 .00 .00 13 .00 .00 .00 7.5 26 10 5.3 2.9 1.4 .49 .00 .00 10 .00 .00 .00 6.3 27 12 12 2.8 1.5 .43 .00 .00 8.4 .00 .00 .00 5.5 28 30 12 2.5 1.5 .41 .00 .00 6.7 .00 .00 .38 4.9 29 30 11 2.4 1.5 --- .00 .00 5.4 .00 .00 1.8 4.2 30 21 9.4 2.3 1.4 .00 .00 4.3 .00 .00 1.1 3.8 31 15 --- 2.3 1.4 .09 --- 3.4 --- .00 .60 --- TOTAL 1306.5 2340.7 176.4 52.8 22.10 2.87 1.50 277.66 28.13 .00 4.17 432.90 MEAN 42.1 78.0 5.69 1.70 .79 .09 .05 8.96 .94 .00 .13 14.4 MAX 580 757 16 2.2 1.5 .38 .20 43 2.9 .00 1.8 56 MIN 3.2 4.1 2.3 1.4 .41 .00 .00 .00 .00 .00 .00 .00 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 2590 4640 350 105 44 5.7 3.0 551 56 .00 8.3 859 WTR YR 1985 TOTAL 4645.73 MEAN 12.7 MAX 757 MIN .00 CFSM .00 IN. .00 AC-FT 9210 258 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 1984 TO SEPTEMBER 1985 STREAMFI.OW, SPECIFIC CON- TEMPERA- STRHAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) FEB, 22 1130 0.6 603 22.0 SEP, 10 1250 3.4 969 25.0 MAR, 04 1553 0.2 760 23.6 RIO GUANAJIBO BASIN 259 60133600 RIO GUANAJIBO NEAR SAN GERMAN, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°07'18", long 67°03'66", at bridge on Highway 347, 2.2 ni (3.5 km) northwest of San German. DRAINAGE AREA.--45.5 sq ni (117.8 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER QUALITY DATA, WATER YEARS OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 09... 0925 106 473 8.10 25.0 2.0 6.6 81 18 27000 JAN 1985 31... 1700 9 622 7.80 24.0 1.0 1.3 15 38 K120000 K10000 MAR 21... 0900 13 602 7.70 24.0 1.0 3.4 40 14 31000 2100 MAY 31... 1525 23 540 8.20 30.0 0.7 7.8 103 <10 K840 K120 AUG 29... 1220 25 456 7.90 28.6 4.0 6.7 86 13 K1200 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- (MOIL 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 1984 09... 230 10 24 41 12 0.3 1.5 219 19 14 JAN 1985 31... 270 29 49 34 0.9 6.7 278 <0.5 36 31 MAR 21... 254 MAY 31... 250 13 27 45 19 0.5 2.2 240 <0.5 23 21 AUG 29... 192 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 1984 09... 0.1 33 280 79 <1 0.87 0.03 0.90 0.47 0.83 JAN 1985 31... 0.6 32 380 4 0.01 <0.10 2.30 1.5 MAR 21... 6 MAY 31... <0.1 31 310 20 8 0.36 0.15 0.50 0.28 0.12 AUG 29... 2 0.66 0.14 0.80 0.34 0.46 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PIIOS- 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 (UO/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 1984 09... 1.3 2.2 9.7 0.19 JAN 1985 31... 3.8 3.20 1 100 190 1 8 10 MAR 21... MAY 31... 0.4 0.9 4.0 0.32 1 100 100 <1 9 <10 AUG 29... 0.8 1.6 7.1 0.46 K = non-ideal count RIO GUANAJIBO BASIN 260 60133600 RIO GUANAJIBO NEAR SAN GERMAN, PR--Continued WATER QUALITY DATA, WATER YEARS OCTOBER 1984 TO SEPTEMBER 1985 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 BRABLE ERABLE ERABLB 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 1984 09... JAN 1985 31... 210 4 370 <0.1 <1 <1 10 <0.01 4 0.1 MAR 21... 0.1 MAY 31... 100 2 120 <0.1 <1 <1 <0.01 10 0.04 AUG 29... RIO GUANAJ1B0 BASIN 261 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 sq mi (42.5 sq km). 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 current year. GAGE.--Water-stage recorder and concrete control. Elevation of gage is 230 ft (70 m), from topographic map. REMARKS.--Estimated daily discharges: Nov. 8-Jan. 17, May 20-July 10, Aug. 16-Sept. 30. Records poor. AVERAGE DISCHARGE.--10 years (1976-85), 45.2 cu ft/s (1.280 cu m/s), 37.43 in/yr (951 mm/yr), 32,750 acre-ft/yr (40.4 cu hm/yr); median of yearly mean discharges, 44 cu ft/s (1.25 cu m/s), 31,900 acre-ft/yr (39 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 33,800 cu ft/s (957 cu m/s) Sept. 16, 1975, gage height, 19.6 ft (5.97 m), from floodmarks, from rating curve extended above 60 ou ft/s (1.70 cu m/s) on basis of slope-area measurement of peak flow; minimum daily discharge, 2.4 cu ft/s (0.068 cu m/s), June 18, 21, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 cu ft/s (42.5 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (01) Oct. 17 1745 3,410 96.6 7.61 2.320 May 18 1345 *5,590 158 *9.26 2.822 Oct. 19 1530 2,950 83.5 7.21 2.198 Aug. 11 1630 3,020 85.5 7.27 2.216 Nov. 3 1045 2,190 62.0 6.44 1.963 Sept. 10 1700 1,650 46.7 5.79 1.765 Minimum daily discharge, 11 cu ft/a (0.312 cu m/s), Feb. 20. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEE' 1 71 150 34 20 14 14 30 20 31 65 33 45 2 67 101 33 22 14 14 24 21 29 30 25 40 3 80 547 32 20 14 14 22 48 29 28 21 40 4 61 175 30 19 13 14 22 27 26 27 20 66 5 63 117 30 19 13 14 26 23 26 30 32 178 6 63 96 31 18 12 15 25 36 25 25 34 200 7 58 90 30 18 12 27 22 44 25 26 28 86 8 52 80 29 19 12 30 25 41 35 50 21 134 9 52 74 28 18 13 33 20 30 26 26 19 76 10 49 70 40 17 19 31 19 38 26 61 25 268 11 46 68 30 18 18 41 19 51 25 52 228 70 12 46 68 32 17 14 24 19 38 25 31 77 56 13 44 61 28 16 14 18 18 30 25 27 48 50 14 42 60 27 17 14 16 18 26 26 24 116 45 15 46 58 26 17 13 15 17 25 25 25 59 60 16 55 53 27 18 12 14 17 25 25 109 40 50 17 333 50 27 16 13 13 17 219 26 45 35 45 18 213 45 25 16 13 13 17 1030 65 34 30 43 19 332 46 24 16 12 13 17 239 28 30 27 50 20 186 44 24 16 11 15 16 96 28 28 93 45 21 116 41 23 16 13 17 17 64 29 27 63 43 22 83 40 24 16 13 15 71 64 29 26 45 42 23 73 42 23 16 13 15 51 52 95 25 40 41 24 70 38 21 15 14 13 27 48 35 25 36 80 25 69 37 22 15 14 12 52 47 65 24 64 50 26 69 38 22 15 14 12 50 42 35 23 45 45 27 68 37 23 15 14 14 29 40 33 27 35 60 28 68 35 23 15 14 13 24 40 32 25 35 50 29 68 33 22 15 --- 12 22 36 29 25 40 42 30 111 34 21 14 83 20 35 30 23 126 39 31 76 --- 20 15 45 --- 35 --- 22 60 --- TOTAL 2830 2428 831 524 379 639 773 2610 988 1045 1600 2139 MEAN 91.3 80.9 26.8 16.9 13.5 20.6 25.8 84.2 32.9 33.7 51.6 71.3 MAX 333 547 40 22 19 83 71 1030 95 109 228 268 MIN 42 33 20 14 11 12 16 20 25 22 19 39 CFSM 5.57 4.93 1.63 1.03 .82 1.26 1.57 5.13 2.01 2.05 3.15 4.35 IN. 6.42 5.51 1.88 1.19 .86 1.45 1.75 5.92 2.24 2.37 3.63 4.85 AC-FT 5610 4820 1650 1040 752 1270 1530 5180 1960 2070 3170 4240 CAL YR 1984 TOTAL 18817.3 MEAN 51.4 MAX 547 MIN 8.7 CFSM 3.13 IN. 42.68 AC-FT 37320 WTR YR 1985 TOTAL 16786 MEAN 46.0 MAX 1030 MIN 11 CFSM 2.80 IN. 38.08 AC-FT 33300 262 RIO GUANAJIBO BASIN 50136000 RIO ROSARIO AT ROSARIO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS OCTOBER 1982 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURN DATE TIME INSTANTANEOUS DUCTANCE TUBE (CFS) (UMHOS) (DEG C) (CFS) (UMEOS) (DEG C) MAR, 05 1214 16 267 23.5 SHP, 10 0915 59 246 23.0 I RIO GUANAJIBO BASIN 263 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°09'36", long 67°05'08", at bridge on Highway 348, 0.5 .i (0.8 km) southwest of Rosario plaza. DRAINAGE AREA.--18.3 mg i (47.4 sq k.). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 08... 1710 88 240 8.30 25.0 3.7 8.0 98 34 560 490 FEB 1985 08... 0960 13 296 8.30 20.0 0.5 9.5 106 10 58 110 MAR 21... 1245 20 259 8.50 27.0 2.0 9.7 122 14 290 290 JUN 07... 0800 20 258 8.40 24.5 1.4 8.5 102 10 40 K80 AUG 15... 1145 58 196 8.30 26.0 47 8.3 101 10 2800 920 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, 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 MO/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) NOV 1984 08... 110 19 15 6.2 0.3 1.0 110 6.9 FEB 1985 08... 130 26 17 9.5 0.4 1.2 139 <0.5 6.4 MAR 21... 127 JUN 7... 120 1 23 16 8.6 0.3 1.0 122 <0.5 6.7 AUG 15... 84 SOLIDS, SOLIDS, CHLO- FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- RIDE, RIDE, DIS- CONSTI- DIS- AT 106 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 FENDED (MG/I, (MG/L (MG/L (MO/L AS CL) AS F) 5102) (MG/L) DAY) (MO/L) AS N) AS N) AS N) AS N) NOV 1984 8... 6.1 <0.1 28 150 36 4 <0.01 0.80 <0.01 FEB 1985 08... 10 <0.1 28 180 6.4 3 <0.01 0.40 <0.01 MAR 21... 3 <0.01 0.40 0.01 0.29 JUN 7... 8.6 <0.1 26 160 8.7 8 <0.01 0.20 0.14 0.06 AUG 15... 42 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- P1103- 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 1984 8... 0.4 1.2 5.3 0.05 FEB 1985 08... 0.2 0.6 2.7 0.06 <1 <100 <20 <1 6 <10 MAR 21... 0.3 0.7 3.1 0.03 JUN 07... 0.2 0.4 1.8 0.03 <1 <100 <20 <1 18 <10 AUG 15... K = non-ideal count 264 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RRCOV- RECOV- RRCOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UO/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HO) AS SE) AS AG) AS ZN) AS CN) (UO/L) (MG/L) NOV 1984 08... FEB 1985 08... 170 1 <10 <0.1 <1 <1 20 <0.01 <1 0.02 MAR 21... 0.1 JUN 07... 230 2 10 <0.1 <1 <1 40 <0.01 3 <0.01 AUG 15... I 265 RIO GUANAJIBO BASIN 50138000 RIO GUANAJIBO NEAR HORMIGUIiUOS, PR LOCATION.--Lat 18°08'36", long 67°08'57", Hydrologic Unit 21010003, at bridge on Highway 100, 1.4 mi (2.3 km) west of Hormigueros, and 2.0 i (3.2 km) downstream from Rio Rosario. DRAINAGE AREA.--120 sq mi (311 sq km). 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 mi (0.5 km) upstream at datum 7.36 ft (2.243 m) higher. REMARKS.--No estimated daily discharges during water year. Records fair. AVERAGE DISCHARGE.--12 years (1974-85), 216 cu ft/s (6.117 cu m/s), 24.44 in/yr (621 mm/yr), 156,500 acre-ft/yr (193 cu hm/yr); median of yearly mean discharges, 200 cu ft/s (5.66 cu m/s), 145,000 acre-ft/yr (180 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 128,000 cu ft/s (3,620 cu m/s), Sept. 16, 1975, gage height, 28.50 ft (8.687 m), site and datum then in use, from rating curve extended above 100 cu ft/s (2.83 cu m/s) on the basis of contracted-opening measurement of peak flow; minimum discharge, 4.6 cu ft/s (0.130 cu m/s), June 22, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 cu ft/s (56.6 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Oct. 18 0630 2,480 70.2 19.68 5.998 May 18 2245 7,660 217 22.88 6.974 Nov. 3 2300 *11,300 320 *24.10 7.346 Nov. 6 2130 2,200 62.3 18.93 5.770 Minimum discharge, 18 cu ft/a (0.510 cu m/s), Feb. 21. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 252 331 99 52 28 53 166 58 79 46 85 91 2 202 344 99 52 29 47 109 108 76 102 90 76 3 189 2900 96 50 28 35 89 400 87 59 58 43 4 184 5080 90 49 26 59 77 174 132 43 48 32 5 331 1450 88 47 25 40 82 124 75 36 59 177 6 209 803 85 49 24 32 75 106 65 33 115 787 7 208 540 83 48 23 114 63 140 62 31 109 759 8 175 456 110 45 22 175 62 124 56 29 73 461 9 172 357 89 43 23 105 54 96 52 49 65 279 10 179 302 100 43 22 86 50 87 47 46 57 387 11 160 260 84 46 23 118 49 107 44 108 354 592 12 151 222 79 43 64 69 46 104 45 54 481 510 13 146 199 78 40 36 55 42 76 41 46 230 501 14 142 183 72 39 29 49 39 65 43 41 234 379 15 164 171 71 38 28 43 33 59 39 77 186 436 16 192 159 70 38 27 41 30 73 39 219 127 284 17 576 151 70 37 24 39 28 652 36 217 112 220 18 1900 144 65 35 23 34 27 2590 59 92 87 208 19 1100 141 63 35 22 34 27 3460 104 71 76 191 20 900 131 62 35 22 33 28 1210 54 68 488 155 21 798 128 60 32 20 38 26 656 43 58 452 171 22 958 125 58 31 21 35 39 412 92 112 168 289 23 481 131 57 32 22 33 141 310 158 177 107 171 24 349 125 61 32 23 32 63 264 208 121 84 584 25 295 126 59 30 25 30 50 218 119 73 97 370 26 262 178 56 31 48 45 126 175 142 67 165 209 27 263 125 55 31 39 69 99 148 73 62 127 359 28 260 130 53 30 41 40 62 129 55 99 98 302 29 206 109 51 29 --- 59 53 107 49 71 68 195 30 234 103 53 29 487 46 112 46 68 106 167 31 311 --- 55 28 523 --- 79 --- 52 199 --- TOTAL 11949 15604 2271 1199 787 2652 1881 12423 2220 2427 4805 9385 MEAN 385 520 73.3 38.7 28.1 85.5 62.7 401 74.0 78.3 155 313 MAX 1900 5080 110 52 64 523 166 3460 208 219 488 787 MIN 142 103 51 28 20 30 26 58 36 29 48 32 CFSM 3.21 4.33 .61 .32 .23 .71 .52 3.34 .62 .65 1.29 2.61 IN. 3.70 4.84 .70 .37 .24 .82 .58 3.85 .69 .75 1.49 2.91 AC-FT 23700 30950 4500 2380 1560 5260 3730 24640 4400 4810 9530 18620 CAL YR 1984 TOTAL 80043 MEAN 219 MAX 5080 MIN 13 CFSM 1.82 IN. 24.81 AG t.r 158800 WTR YR 1985 TOTAL 67603 MEAN 185 MAX 5080 MIN 20 CFSM 1.54 IN. 20.96 AC-FT 134100 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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 8... 1200 477 344 7.70 25.0 60 5.0 81 26 20000 7500 FEB 1985 01... 1000 28 476 7.90 22.0 1.5 6.1 69 18 2200 K640 MAR 20... 1625 38 465 7.80 25.5 85 4.9 60 17 35000 K11000 MAY 31... 1100 87 467 7.90 27.0 1.0 5.5 69 <10 39000 4500 AUG 9... 1515 61 430 8.00 32.0 19 4.7 64 16 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CIILO- 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 (MO/L (MG/L (MG/L CACO3) CACO3 AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS SO4) AS CL) NOV 1984 8... 65 16 6.1 12 0.7 1.3 153 11 15 FEB 1986 01... 220 8 33 34 18 0.5 1.8 214 <0.5 19 20 MAR 20... 207 MAY 31... 220 5 31 34 15 0.5 2.2 212 <0.5 18 16 AUG 9... 189 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 1984 8... <0.1 18 170 220 65 0.57 0.03 0.60 0.26 0.54 FEB 1985 01... 0.2 30 280 21 6 0.87 0.03 0.90 0.17 0.63 MAR 20... 183 MAY 31... 0.1 31 270 64 24 0.37 0.03 0.40 0.31 0.29 AUG 9... 30 0.89 0.11 1.00 0.37 0.43 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 LIKABLE 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 1984 8... 0.8 1.4 6.2 0.32 FEB 1985 01... 0.8 1.7 7.5 0.59 <1 100 100 1 8 <10 MAR 20... MAY 31... 0.6 1.0 4.4 0.34 <1 100 50 <1 14 <10 AUG 9... 0.8 1.8 8.0 0.73 K = non-ideal count RIO GUANAJIBO. BASIN 267 60138000 RIO GUANAJIBO NEAR HORMIGUEROS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1984 08... FEB 1985 01... 440 2 140 <0.1 <1 <1 20 <0.01 <1 0.05 MAR 20... 0.2 MAY 31... 1000 6 220 <0.1 <1 <1 <10 <0.01 12 0.03 AUG CHLOR- DI- DI- PCB, ALDRIN, DANE, DUD, DDB, 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) AUG 1985 09... 1515 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 0.03 <0.01 HEPTA- METII- 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) AUG 1985 09... <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- 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) AUG 1985 09... <0.01 <0.01 <0.01 <0.01 <0.1 <0.1 <1 <0.01 LARES • Rio Calsbrinas basin mi Aflasco io Suajotaoa Rio Grand basin 'o ASCO RIO Comas basin LAS MARIA R.4 Calo s BAHIA DE MAVAQUEZ MAYA UEZ MARICAO Logo 'Logo Toro Prieto N Drainage boundary EXPLANATION A1410 SURFACE-WATER STATION AND NUMBER 2\1389 LOW-FLOW STATION AND NUMBER V1385 QUALITY-OF-WATER STATION AND NUMBER • 45 WELL AND WELL NUMBER SAN JUAN • AOUAOILLA •ARECI$O FAJARDO Map area-- P NCE. ODAYAMA 3 4 5 KILOMETERS Figure 26.--Rio Yaguez and Rio Grande de Afiasco basins. I I RIO YAGUEZ BASIN 270 60138800 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 i (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 i (17.3 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STEEP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CPS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 07... 1630 29 262 8.00 24.0 6.2 7.7 93 <10 1400 790 FEB 1985 01... 1650 312 8.20 23.0 0.6 8.1 94 26 660 760 MAR 21... 1700 247 8.00 24.0 25 7.8 93 17 5900 3100 JUN 07... 1135 293 8.30 27.0 1.6 8.1 101 K150 210 AUG 15... 1530 8.0 418 7.90 28.0 47 7.8 99 11 3800 3500 ALKA- MAGNE- SODIUM POTAS- LINITY CHLO- HARD- CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) AS CA) AS MG) AS NA) AS K) CAC03 AS 8) AS 804) AS CL) NOV 1984 07... 110 28 9.2 9.3 0.4 1.9 114 6.4 7.9 FEB 1985 01... 140 37 11 13 0.5 1.7 146 <0.5 8.8 11 MAR 21... 110 JUN 07... 130 34 10 12 0.5 1.9 138 <0.5 8.6 11 AUG 15... 84 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 FENDED (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 1984 07... <0.1 28 160 12 1 <0.01 1.00 0.07 0.13 FEB 1985 01... 0.1 31 200 2 <0.01 0.50 0.13 0.37 MAR 21... 46 <0.01 0.80 0.04 0.16 JUN 07... <0.1 26 190 3 <0.01 0.40 0.02 0.38 AUG 15... 12 0.79 0.01 0.80 0.03 0.27 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) NOV 1984 07... 0.2 1.2 6.3 0.04 FEB 1985 01... 0.5 1.0 4.4 0.09 <1 100 30 1 <1 <10 MAR 21... 0.2 1.0 4.4 0.07 JUN 07... 0.4 0.8 3.5 0.03 <1 200 <20 <1 5 <10 AUG 15... 0.3 1.1 4.9 0.03 K = non-ideal count RIO YAGUEZ BASIN 271 50138800 RIO YAGUEZ NEAR MAYAGUEZ, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS TOTAL TOTAL TOTAL TOTAL EELS- 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. (U0/L (UO/L (UO/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 1984 07... FEB 1985 01... 240 2 <10 <0.1 <1 <1 10 <0.01 <1 0.03 MAR 21... 0.1 JUN 07... 170 2 10 <0.1 <1 <1 30 7 0.03 AUG 15... I I 272 RIO GRANDE DE ANASCO BASIN 50141000 RIO BLANCO NEAR ADJUNTAS, PR LOCATION.--Lat 18°12'19", long 66°48'01", Hydrologic Unit 21010003, on right bank near dirt road off Highway 129, 0.4 mi (0.6 km) northwest of Highways 129 and 135 junction, 2.5 mi (4.0 km) northeast of Castaner, 2.3 mi (3.7 km) east-southeast of Lago Guayo Dam, and 0.5 i (0.8 km) upstream from Rio Limani. DRAINAGE AREA.--15.4 sq mi (40.1 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1946 to December 1966 in reports of the Puerto Rico Water Resources Authority as "Rio Yahuecas near Adjuntas"; June 1980 to January 1985 (discontinued). GAGE.--Water-stage recorder. Elevation of gage is about 1,530 ft (466 a) from USGS topographic map. REMARKS.--No estimated daily discharges during period of record. Records fair. AVERAGE D1SCHARGE.--24 years (1947-66, 1981-84), 37.2 ou ft/s (1.054 cu /s), 32.80 in/yr (833 mm/yr), 27,000 acre-ft/yr (33.3 cu hm/yr); median of yearly mean discharges, 36 cu ft/s (1.02 cu m/s), 26,100 acre-ft/yr (32 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 17,000 cu ft/s (481 cu m/s), Oct.. 13, 1954, gage height unknown; minimum discharge, 4.4 cu ft/s (0.125 cu m/s), Apr. 23, 25, 1984. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 1,700 cu ft/s (48.1 cu m/s) and maximum (*); Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Date Time (cu ft/a) (cu m/a) (ft) (m) Oct. 15 1530 5,860 166 13.71 4.179 Nov. 3 1045 *6,290 178 *13.99 4.264 Oct. 17 1730 3,490 98.8 11.96 3.645 Nov. 25 1930 1,900 53.8 10.40 3.170 Oct. 19 1500 4,960 140 13.10 3.993 Minimum discharge, 16 cu ft/s (0.543 cu m/s), Jan.29-31. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 42 51 48 26 2 40 45 48 25 3 49 1160 42 24 4 39 187 39 24 5 181 122 38 23 6 102 96 37 23 7 68 199 36 23 8 54 184 35 23 9 64 171 35 22 10 55 113 34 22 11 46 97 34 21 12 42 81 32 21 13 41 72 31 21 14 40 70 31 21 15 422 65 31 21 16 200 60 37 20 17 311 57 41 20 18 135 55 32 20 19 394 52 32 19 20 155 49 30 19 21 99 46 29 19 22 76 45 29 18 23 66 45 29 18 24 59 42 46 18 25 56 221 30 18 26 57 88 29 17 27 49 56 29 17 28 51 50 28 17 29 47 46 27 17 30 51 42 29 17 31 46 --- 27 17 TOTAL 3137 3667 1055 631 MEAN 101 122 34.0 20.4 MAX 422 1160 48 26 MIN 39 42 27 17 CFSM 6.56 7.92 2.21 1.32 IN. 7.58 8.86 2.55 1.52 AC-FT 6220 7270 2090 1250 CAL YR 1984 TOTAL 16120.9 MEAN 44.0 MAX 1160 MIN 4.9 CFSM 2.86 IN. 38.94 AC-FT 31980 RIO GRANDE DE ANASCO BASIN 273 50141100 LAGO YAHUECAS NEAR CASTANER, PR LOCATION.--Lat 18°13'20", long 66°49'15", Hydrologic Unit 21010003, at Yahuecas Dam on Rio Blanco, 1.1 mi (1.8 km) northeast of Lago Guayo, 2.8 mi (4.5 km) northeast of Castaner, 3.8 mi (6.1 km) northeast of Lago Prieto, and about 4.0 mi (6.4 km) northwest of Adjuntas. DRAINAGE AREA.--17.4 sq mi (45.1 sq km). ELEVATION RECORDS PERIOD OF RECORD.--April 1980 to January 1985 (discontinued). GAGE.--Water-stage recorder. Elevation of gage is 1,400.00 ft (426.720 m) above mean sea level. REMARKS.--Lago Yahuecas was completed in 1956. The dam is a unit of the southwestern Puerto Rico project and provides a maximum storage of 1,800 ac-ft (2.22 cu ha) for power and irrigation. The dam is a concrete gravity structure with a total length of 450 ft (137.2 m), a maximum structural height of 90 ft (27.4 a), and a maximum base width of 60 ft (18.3 a). The spillway is an ungated overflow type with a crest elevation of 71.00 ft (21.641 m) and a crest length of 200 ft (61.0 m); It was designed to pass a maximum flood of 38,000 cu ft/s (1,076 cu m/s) at a reservoir elevation of 84.00 ft (25.603 m). Timber flashboards, originally installed on the spillway crest, were subsequently removed and their use discontinued. Diversions are conveyed to Lago Guayo by an 11 ft (3.4 m) diameter, 6,470 ft (1,972 a) long tunnel, mostly unlined. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation, 76.61 ft (23.351 m), Sept. 13, 1982; minimum elevation, 46.67 ft (14.225 a), Sept. 9, 1984. EXTREMES OBSERVED FOR CURRENT PERIOD.--Maximum elevation, 74.32 ft (22.653 m) Nov. 3; minimum elevation, 52.11 ft (15.883 a) Jan. 24. Capacity Table (based on data from Puerto Rico Water Resources Authority) Elevation, in feet Contents, in acre-feet Elevation, in feet Contents, in acre-feet 30 0 65 1,000 49 393 71 1,308 60 778 75 1,540 DAY OCT NOV 1 A 71.32 2 A 71.28 3 71.25 71.84 4 71.19 A 5 71.60 A 6 71.35 A 7 71.28 8 71.27 9 71.28 10 71.28 A 11 71.28 A 12 71.26 I 13 71.25 A 14 71.24 71.29 15 71.66 71.28 16 71.49 71.25 17 71.71 71.24 18 71.43 71.25 19 71.66 71.22 20 71.52 71.22 21 71.41 71.19 22 71.36 71.23 23 71.33 71.18 24 71.30 71.18 25 71.30 71.70 26 71.37 71.30 27 71.37 71.31 28 71.33 71.29 29 71.28 71.27 30 71.32 71.26 31 71.28 --- MEAN 65.45 MAX 71.84 MIN 52.76 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 2400 DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 71.43 55.34 71.26 55.29 71.28 55.43 71.22 55.16 58.89 55.25 55.44 55.11 55.41 55.33 55.45 55.12 55.68 53.59 55.61 53.14 55.83 52.64 55.94 52.59 55.78 52.72 55.78 52.83 56.10 52.82 56.69 52.91 56.53 52.99 56.31 53.07 56.60 53.08 56.74 53.05 56.68 53.10 56.74 53.18 57.02 53.11 57.72 52.27 58.05 52.33 57.38 52.33 56.74 52.52 56.52 52.45 56.03 52.34 55.89 52.50 55.52 A 58.33 71.43 55.41 A No gage-height record. 274 RIO GRANDE DE ANASCO BASIN 50141500 LAGO GUAYO NEAR CASTANER, PR LOCATION.--Lat 18°12'46", long 66°50'06", Hydrologic Unit 21010003, at Guayo Dam on Rio Guayo, 1.1 mi (1.8 km) southwest of Lago Yahuecas, 2.6 mi (4.2 km) southwest of Lago Prieto, 2.1 mi (3.4 km) north of Castaner, and 6.0 mi (9.6 km) west of Adjuntas. DRAINAGE AREA.--9.60 sq mi (24.86 sq km). ELEVATION RECORDS PERIOD OF RECORD.--April 1980 to January 1985 (discontinued). GAGE.--Water-stage recorder. Datum of gage is 1,400.00 ft (426.720 m) above mean sea level. REMARKS.--Lago Guayo was completed in 1956. The dam is on Rio Guayo and is the largest in the southwestern Puerto Rico project. The maximum storage is 17,400 ac-ft (21.5 cu hm) for power and irrigation. The dam is a concrete gravity structure with a total length of 555 ft (169.2 m), a maximum structural height of 190 ft (57.9 m), and a maximum width at the base of 145 ft (44.2 a). The ungated overflow spillway with a crest elevation of 60.00 ft (18.288 a) and a crest length of 220 ft (67.1 m) was designed to pass a maximum flood of 30,200 cu ft/a (855 cu m/s) at a reservoir elevation of 70.00 ft (21.336 ft). Timber flashboards that were added to increase storage capacity were subsequently removed and their use discontinued. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation, 62.43 ft (19.029 m), May 27, 1980; minimum elevation, 28.62 ft (8.723 m), May 2, 1984. EXTREMES OBSERVED FOR CURRENT PERIOD.--Maximum elevation, 59.68 ft (18.190 m) Oct. 22; minimum elevation, 46.81 ft (14.268 m) Jan. 14. Capacity Table (based on data from Puerto Rico Water Resources Authority) Elevation, in feet Contents, in acre-feet Elevation, in feet Contents, in acre-feet 30 6,530 60 13,550 49 10,660 65 15,000 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 2400 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 58.93 48.61 51.75 53.82 2 58.14 47.41 52.11 53.31 3 57.70 54.26 52.50 53.38 4 56.98 56.26 52.82 52.73 5 56.72 57.25 54.58 52.88 6 56.22 58.06 54.75 52.52 7 55.67 58.52 54.12 52.53 8 55.44 58.94 63.67 51.61 9 55.36 59.06 54.23 50.31 10 54.97 58.98 53.78 49.08 11 54.43 58.99 54.12 47.99 12 53.96 58.76 54.61 47.07 13 53.47 57.84 54.40 46.86 14 52.95 56.75 54.35 47.14 15 54.39 56.49 54.77 47.53 16 54.85 54.39 55.23 47.89 17 56.25 53.13 55.86 48.26 18 57.40 52.78 55.51 48.63 19 58.58 51.54 55.88 48.96 20 59.14 50.73 56.34 49.29 21 59.37 49.05 56.26 49.62 22 59.27 49.49 56.47 49.95 23 58.76 49.28 56.91 50.26 24 57.52 49.68 57.67 50.59 25 56.56 51.06 58.07 50.89 26 55.40 51.38 57.24 51.20 27 54.36 51.04 56.29 51.48 28 53.64 51.25 55.78 51.77 29 52.46 51.69 55.16 52.07 30 50.93 51.36 54.84 52.35 31 49.89 --- 54.56 A MEAN 55.80 53.77 54.99 MAX 59.37 59.06 58.07 MIN 49.89 47.41 51.75 A No gage-height record. 275 RIO GRANDE DE ANASCO BASIN 50142500 LAGO PRIETO NEAR CASTANER, PR LOCATION.--Lat 18°11'08", long 66°51'48", Hydrologic Unit 21010004, at dam on Rio Prieto, 2.0 mi (3.2 km) west of Castaner, 3.1 mi (5.0 km) southwest of Lago Guayo, 3.8 mi (6.1 km) southwest of Lago Yahuecas, and about 9 mi (14 km) west of Adjuntas. DRAINAGE AREA.--9.60 sq mi (24.86 sq km). ELEVATION RECORDS PERIOD OF RECORD.--May 1980 to January 1985 (discontinued). GAGE.--Water-stage recorder. Datum of gage is 1,400.00 ft (476.720 m) above mean sea level. REMARKS.--Lago Prieto was completed in 1955. It provides a maximum storage of approximately 700 ac-ft (0.863 cu hm) for power and irrigation. A power tunnel adit from the reservoir to the Lago Guayo tunnel allows for releases to Power Plant No. 1. Turbine releases are collected in Lago Antonio Lucchetti and are reused for power generation at Power Plant No. 2. The dam is a concrete gravity structure with a total length of 260 ft (79.2 m), a maximum structural height of 98 ft (29.9 m), and a maximum base width of 65 ft (19.8 m). The ungated overflow spillway, with a crest elevation of 85.00 ft (25.908 m), and a crest length of 170 ft (51.8 m) was designed to pass a maximum flood of 32,000 cu ft/s (906 cu m/s). Timber fl.ashboards that were added after initial construction were subsequently removed, and their use discontinued. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation, 87.49 ft (26.667 m), Sept. 13, 1982; minimum, less than 52.60 ft (16.032 m) many days. EXTREMES OBSERVED FOR CURRENT PERIOD.--Maximum elevation, 86.80 ft (26.457 m) Nov. 3; minimum elevation, 56.74 ft (17.294 m) Jan. 10. Capacity Table (based on data from Puerto Rico Water Resources Authority) Elevation, in feet Contents, in acre-feet Elevation, in feet Contents, in acre-feet 49 0 85 484 60 97 90 586 65 156 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 2400 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 65.26 64.70 63.98 56.99 2 64.93 63.27 64.26 57.02 3 67.62 77.02 64.27 56.94 4 64.78 67.36 64.29 56.91 5 66.96 67.15 64.34 56.86 6 65.70 66.69 61.31 57.02 7 64.54 67.99 59.51 56.87 8 63.87 69.20 58.89 56.76 9 65.89 68.21 59.01 56.86 10 64.42 67.46 59.24 56.87 11 63.32 67.27 58.30 57.01 12 62.70 66.81 57.99 57.07 13 62.37 65.95 57.45 57.12 14 62.22 65.61 57.57 57.13 15 65.25 65.17 57.64 57.16 16 65.28 64.77 57.84 57.16 17 71.08 64.50 57.99 57.22 18 65.86 64.67 57.46 57.23 19 67.45 63.96 57.44 57.24 20 70.39 63.57 57.62 57.25 21 66.86 63.38 57.16 57.28 22 65.46 63.31 57.00 57.29 23 65.15 63.40 57.43 57.29 24 64.66 63.19 58.45 57.32 25 65.20 73.32 58.12 57.33 26 64.26 64.58 57.28 57.34 27 63.78 64.27 56.95 57.38 28 63.74 63.75 56.99 57.39 29 63.20 63.69 56.87 57.40 30 63.42 63.64 56.88 A 31 66.47 --- 56.87 A MEAN 65.23 65.93 58.92 MAX 71.08 77.02 64.34 MIN 62.22 63.19 56.87 A No gage-height record. I RIO GRANDE DE ANASCO BASIN 50143000 RIO GRANDE DE ANASCO NEAR LARES, PR 276 WATER-QUALITY RECORDS LOCATION.--Lat 18°15'26", long 66°55'00", at bridge on Highway 124, 0.7 mi (1.1 ku) 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 ui (68.1 sq km) this does not include 36.2 sq mi (93 8 sq km) which contributes only dur- ing high floods, and 3.5 sq i (9.1 sq ku) 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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIE- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1984 31... 1425 111 256 8.40 24.5 13 8.5 104 22 K1300 K1000 FEB 1985 06... 1430 16 327 8.60 25.5 0.5 9.5 118 12 K100 K70 MAR 27... 1320 27 280 8.20 23.0 3.0 8.9 105 <10 220 210 JUN 5... 1425 40 252 8.70 30.0 3.1 8.7 117 17 K910 K64 JUL 31... 1500 22 271 32.0 10 8.4 116 <10 110 140 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 CACO3) CACO3 AS CA) AS MG) AS NA) AS K) CACO3 AS 3) AS 804) AS CL) OCT 1984 31... 100 3 28 8.3 10 0.4 1.6 101 13 8.2 FEB 1985 6... 140 2 36 11 14 0.5 1.6 133 <0.5 23 12 MAR 27... 115 -- JUN 05... 110 13 29 8.0 11 0.5 1.6 92 <0.5 19 9.6 JUL 31... SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 106 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 1984 31... <0.1 28 160 47 12 1.08 0.02 1.10 (0.01 FEB 1985 06... 0.1 32 210 9.0 2 <0.01 0.70 <0.01 MAR 27... 6 0.57 0.03 0.60 0.03 0.37 JUN 5... 0.1 22 160 8 <0.01 0.80 0.07 0.53 JUL 31... 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 1984 31... 0.3 1.4 6.2 0.05 FEB 1985 6... 0.2 0.9 4.0 0.10 <1 <100 <20 <1 <1 <10 MAR 27... 0.4 1.0 4.4 0.02 JUN 05... 0.6 1.4 6.2 0.04 <1 <100 30 1 3 <10 JUL 31... K = non-ideal count 277 RIO GRANDE DE ANASCO BASIN 50143000 RIO GRANDE DE ANASCO NEAR LAKES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESS, MERCURY SILVER, ZINC, LENS° TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE SIZABLE ERABLE TOTAL ERABLE SIZABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UO/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 1984 31... FEB 1985 06... 120 <1 10 <0.1 <1 <1 40 <0.01 <1 0.02 MAR 27... 0.3 -- JUN 05... 220 2 20 (0.1 <1 <1 20 <0.01 4 0.01 JUL 31... 278 RIO GRANDE DE ANASCO BASIN 50144000 RIO GRANDE DR ANASCO NEAR SAN SEBASTIAN, PR LOCATION.--Lat 18°17'05", long 67°03'05", Hydrologic Unit 21010003, on left bank, 200 ft (61 m) downstream from bridge on Highway 108, 0.4 mi (0.6 km) downstream from Quebrada La Zumbadora, 4.4 mi (7.1 km) northwest of Las Marian, 5.4 mi (8.7 km) southwest of San Sebastian. DRAINAGE AREA.--94.3 sq mi (244.2 sq km), does not include 36.2 aq mi (93.8 sq km) which contributes only during high floods, and 3.5 sq mi (9.1 sq km) 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 im) upstream at same datum. REMARKS.--Records fair. 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 cu hm). Limited storm runoff is contributed to basin by 3.5 sq mi (9.1 sq km) above Rio Toro Diversion dam. AVERAGE DISCHARGE.--22 years (1964-85), 310 cu ft/s (8.779 cu m/s), 44.64 in/yr (1,134 mm/yr), 224,600 acre-ft/yr (277 cu hm/yr); median of yearly mean discharges, 302 cu ft/s (8.55 cu m/s), 219,000 acre-ft/yr (270 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 140,000 cu ft/s (3,960 cu m/s), Sept. 16, 1975, gage height, 33.9 ft (10.33 m), from rating curve extended above 4,000 cu ft/s (113 cu m/s) on basis of slope-area measurement; minimum discharge, 31 cu ft/s (0.878 cu m/s), Apr. 19, 20, 1965, gage height, 0.88 ft (0.268 m). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 6,000 cu ft/s (170 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (01) Date Time (cu ft/s) (cu m/s) (ft) (a) Nov. 3 1630 15,200 430 11.45 3.490 May 18 1215 *77,200 2,186 *26.77 8.159 Minimum discharge, 61 cu ft/a (1.728 cu m/s), Apr. 21. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 1340 686 220 122 94 166 89 75 152 83 835 179 2 810 646 244 121 94 199 79 141 149 233 306 190 3 632 4380 235 121 90 105 73 525 309 176 249 177 4 726 1630 211 120 90 138 72 135 381 146 183 148 5 1160 683 200 122 88 100 80 101 174 137 140 158 6 1140 570 172 134 84 86 77 316 202 133 590 1010 7 909 594 152 132 84 85 77 418 240 130 610 490 8 639 685 149 121 84 98 89 208 230 209 408 473 9 531 698 147 119 84 125 92 135 151 194 293 368 10 532 536 147 115 84 125 273 106 147 285 433 283 11 476 469 143 119 93 191 243 142 135 209 461 383 12 776 436 144 111 89 111 139 158 133 287 376 304 13 492 399 145 111 93 93 121 149 124 220 405 315 14 447 392 134 111 89 98 81 86 116 152 684 312 15 1030 391 133 110 88 86 75 77 115 583 537 377 16 804 356 136 107 85 80 70 120 114 377 247 244 17 773 335 144 106 82 78 67 1620 237 404 196 210 18 1460 313 133 106 76 78 66 19100 396 391 196 406 19 1340 313 131 102 76 78 69 3970 346 255 164 356 20 1380 291 134 102 76 108 68 1690 217 186 149 257 21 782 289 132 102 74 186 65 826 174 166 315 203 22 588 269 132 101 74 142 168 474 232 152 162 264 23 520 264 129 100 75 123 455 353 476 152 141 227 24 488 260 159 100 78 101 136 316 487 147 133 447 25 467 255 142 97 78 90 112 266 391 138 354 383 26 443 488 131 94 81 82 311 235 419 443 310 247 27 429 278 129 94 101 83 126 210 225 183 190 387 28 407 251 131 94 84 92 95 194 178 183 159 356 29 406 233 123 94 --- 88 84 180 160 195 135 264 30 505 224 119 94 98 78 169 161 191 427 255 31 616 --- 123 94 111 --- 159 --- 142 404 --- TOTAL 23048 17614 4704 3376 2368 3424 3629 32653 6971 6882 10192 9673 MEAN 743 587 152 109 84.6 110 121 1053 232 222 329 322 MAX 1460 4380 244 134 101 199 455 19100 487 583 835 1010 MIN 406 224 119 94 74 78 65 75 114 83 133 148 CFSM 7.88 6.22 1.61 1.16 .90 1.17 1.28 11.2 2.46 2.35 3.49 3.41 IN. 9.09 6.95 1.86 1.33 .93 1.35 1.43 12.88 2.75 2.71 4.02 3.82 AC-FT 45720 34940 9330 6700 4700 6790 7200 64770 13830 13650 20220 19190 CAL YR 1984 TOTAL 146438 MEAN 400 MAX 4380 MIN 43 CFSM 4.24 IN. 57.77 AC-FT 290500 WTR YR 1985 TOTAL 124534 MEAN 341 MAX 19100 MIN 65 CFSM 3.62 IN. 49.13 AC-FT 247000 RIO GRANDE DE ANASCO BASIN 279 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 1984 TO SEPTEMBER 1985 OXYGEN, COLI- STREP- SPE- DIE- FORM, TOCOCCI STREAM- CIFIC SOLVED FECAL, FECAL, HARD- FLOW, CON- PH TUR- OXYGEN, (PER- 0.7 KF AGAR NESS INSTAN- DUCT- (STAND- TEMPER- BID- DIE- CENT UM-MF (COLS. (MG/L DATE TIME TANEOUS ARCH ARD ATURE ITY SOLVED SATUR- (COLS./ PER AS (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) 100 ML) 100 ML) CACO3) OCT 1984 08... 1600 538 216 7.80 26.5 12 8.2 101 400 K100 95 JAN 1985 10... 1130 115 251 8.20 22.5 2.5 11.5 132 86 54 110 APR 03... 1215 71 241 8.00 26.0 4.0 11.3 138 <2 100 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CIILO- FLUO- SILICA, NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, RIDE, DIE- WATER DIE- DIE- DIE- EORP- DIE- TOTAL DIE- DIE- DIE- SOLVED TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MG/L DATE MG/L AS (MO/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/I. AS CACO3 AS CA) AS MG) AS NA) AS K) CAC03 AS SO4) AS CL) AS F) SI02) OCT 1984 08... 3 24 8.4 8.7 0.4 1.5 92 9.1 7.0 <0.1 29 JAN 1985 10... 27 9.6 9.8 0.4 1.1 108 11 11 <0.1 28 APR 03... 1 26 9.6 9.8 0.4 1.2 104 12 8.2 <0.1 29 SOLIDS, SOLIDS, NITRO- NITRO- NITRO- NITRO- PHOS- PHOS- RESIDUE SUM OF SOLIDS, GEN, GEN, GEN, GEN,AM- PHOS- PHORUS, PHATE, AT 180 CONSTI- DIE- NO2+NO3 AMMONIA AMMONIA MONIA + PHOS- PHORUS, ORTHO, ORTHO, DEG. C TUENTS, SOLVED DIE- DIE- DIE- ORGANIC PHORUS, DIE- DIE- DIE- DIE- DIE- (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 1984 08... 153 140 222 1.00 0.02 0.03 0.4 0.07 0.07 0.03 0.09 JAN 1985 10... 176 160 55 0.76 0.02 0.03 0.3 0.05 0.04 0.03 0.09 APR 03... 159 160 30 0.22 <0.01 0.4 0.04 0.03 <0.01 ALUM- BERYL- CHRO- INUM, ARSENIC BARIUM, LIUM, CADMIUM MIUM, COBALT, COPPER, IRON, LEAD, LITHIUM DIE- DIE- DIS- DIE- DIE- DIE- DIE- DIE- DIE- DIE- 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 AL) AS AS) AS BA) AS BE) AS CD) AS CR) AS CO) AS CU) AS FE) AS PB) AS LI) OCT 1984 08... 10 <1 40 0 <1 <1 <3 6 19 <1 <4 JAN 1985 10... 10 <1 41 <0.5 1 <1 <3 <1 11 <1 <4 APR 03... 10 1 38 <0.5 <1 <1 <3 1 10 <1 4 K = non-ideal count RIO GRANDE DE ANASCO BASIN 280 50144000 RIO GRANDE DR ANASCO NEAR SAN SEBASTIAN, PR--Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 SEM- MANGA- MOLYB- EELS- STRON- VANA- MENT, NESE, MERCURY DENUM, NICKEL, NIUM, SILVER, TIUM, DIUM, ZINC, SEMI- DIE- DIS- DIE- DIS- DIS- DIS- DIE- DIS- DIS- DIS- MENT, CHARGE, SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SUS- SUS- DATE (UG/L (UO/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L PENDED PENDED AS MN) AS HG) AS MO) AS NI) AS SE) AS AG) AS SR) AS V) AS ZN) (MG/L) (T/DAY) OCT 1984 08... 11 <0.1 <10 3 <1 <1 130 <6 12 38 55 JAN 1985 10... 12 <0.1 <10 <1 <1 <1 140 6 4 5 1.6 APR 03... 14 <0.1 <10 1 <1 <1 130 <6 4 54 10 3RD. SUSP. STREAM- SEDI- SIEVE FLOW, MENT, DIAM. INSTAN- SUS- S FINER DATE TIME TANEOUS PENDED THAN (CFS) (MG/L) .062 MM OCT 1984 08... 1600 538 38 91 APR 1985 03... 1215 71 54 92 JUL 03... 1225 175 69 93 I I 281 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 ai (0.3 km) south of Highway 109 at El Espino and 1.4 i (2.3 km) east-southeast fro Anasco plaza. DRAINAGE AREA.--139 sq ma (360 sq ka) this does not include 39.7 sq ai (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 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 07... 1135 780 222 7.80 24.0 12 8.0 96 <10 K1300 K1300 FEB 1985 07... 1630 97 250 8.20 25.0 1.5 9.4 113 <10 K82 K18 MAR 28... 1450 116 241 8.20 26.5 4.5 9.7 120 <10 K20 K18 JUN 07... 1615 177 199 7.70 28.5 90 7.1 91 10 2400 K1300 AUG 16... 1200 518 258 7.60 26.0 46 8.0 97 15 K1900 4700 ALKA- MAGNE- SODIUM POTAS- LINITY CHLO- HARD- CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CACO3) AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS 804) AS CL) NOV 1984 07... 89 22 8.3 8.4 0.4 1.7 92 8.3 6.9 FEB 1985 07... 110 27 9.8 11 0.5 1.4 112 <0.5 9.6 7.9 MAR 28... 105 JUN 07... 83 21 7.5 7.9 0.4 1.6 90 <0.6 9.4 5.9 AUG 16... 87 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 1984 07... <0.1 28 140 292 40 <0.01 1.20 0.06 0.35 FEB 1985 07... <0.1 30 160 43 6 <0.01 0.30 <0.04 MAR 28... 4 0.27 0.03 0.30 0.01 0.79 JUN 07... <0.1 21 130 61 163 0.49 0.01 0.50 0.05 0.96 AUG 16... 68 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 (COIL (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 1984 07..-. 0.4 1.6 7.1 0.07 FEB 1985 07... 0.4 0.7 3.1 <0.04 <1 <100 <20 <1 4 80 MAR 28... 0.8 1.1 4.9 0.03 JUN 07... 1.0 1.5 6.6 0.02 <1 100 20 <1 15 AUG 16... K = non-ideal count 10 282 RIO GRANDE DE ANASCO BASIN 50146000 RIO GRANDE DE ANASCO NEAR ANASCO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 1984 07... FEB 1985 07... 470 <1 100 <0.1 <1 <1 30 <0.01 <1 0.02 MAR 28... 0.2 JUN 07... 6000 3 220 <0.1 <1 <1 30 (0.01 <0.01 AUG 16... CHLOR- DI- DI- PCB, ALDRIN, DANE, DDD, DDB, DDT, AZINON, ELDRIN DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UO/L) (UG/L) (UG/L) (UG/L) (UG/L) AUG 1985 16... 1200 <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 TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UO/L) (UO/L) (UG/L) (UG/L) (UG/L) (UG/L) AUG 1985 16... <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- TUX- 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) AUG 1985 16... (0.01 <0.01 <0.01 <0.01 <0.1 <0.1 <1 <0.01 AGUADILLA • Rib 6uoyobo MACA C",0.6 U Drainage boundary uncertain • 14 RINCON • ASTIAt/T h Rto Guaiataca basin IS. 0 10 no, Coastal basin .1,-..." Coastal basin Rio Grande de Ahasca basin • FLARES a 0 /Drainage boundary EXPLANATION A 1478 SURFACE WATER STATION AND NUMBER A 1462 LOW—FLOW STATION AND NUMBER -1476 QUALITY—OF—WATER STATION AND NUMBER • 83 WELL AND WELL NUMBER O 1 2 3 4 5 KILOMETERS I t I I 1,1 I I 1 1 O 1 2 3 4 5 MILES Figure 27.--Rio Culebrinas basin. I I 284 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 i (3.4 ka) west of Central La Plata. DRAINAGE AREA.--58.2 sq i (150.7 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 01... 1515 149 248 8.10 23.5 80 8.2 97 13 K19000 6700 FEB 1986 06... 0910 22 280 7.80 20.0 2.5 7.0 77 15 360 320 MAR 27... 1735 46 454 7.70 24.6 9.0 6.4 77 29 K1800 570 JUN 06... 1520 66 269 8.40 27.0 5.0 8.3 104 20 K810 <10 AUG 01... 1340 72 288 8.50 27.0 8.6 8.7 109 <10 3400 3400 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 1984 01... 100 1 33 4.3 8.7 0.4 2.1 99 10 11 FEB 1985 06... 100 32 5.3 17 0.8 2.2 112 <0.5 14 14 MAR 27... 174 JUN 06... 110 0 37 5.1 15 0.6 2.5 113 <0.5 14 11 AUG 01... 112 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 FENDED (MG/L (MO/L (MG/L (MG/L (MG/L AS F) SIO2) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) NOV 1984 01... 0.1 23 150 61 98 1.07 0.03 1.10 0.12 0.58 FEB 1985 06... 0.1 34 190 11 4 1.22 0.08 1.30 0.08 0.22 MAR 27... 18 0.71 0.09 0.80 0.28 0.82 JUN 06... 0.1 28 180 32 16 0.86 0.04 0.90 0.13 2.3 AUG 01... 1.15 0.05 1.20 0.05 0.55 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 (UO/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 1984 01... 0.7 1.8 8.0 0.10 FEB 1985 06... 0.3 1.6 7.1 0.24 2 <100 40 <1 <1 10 MAR 27... 1.1 1.9 8.4 0.54 JUN 06... 2.4 3.3 15 0.06 <1 <100 <20 8 2 10 AUG 01... 0.6 1.8 8.0 0.09 K = non-ideal count RIO CULEBRINAS BASIN 285 50147600 RIO CULEBRINAS NEAR SAN SEBASTIAN, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS 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 HO) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) NOV 1984 01... FEB 1985 06... 300 1 50 <0.1 <1 <1 20 <0.01 2 0.04 MAR 27... 0.2 JUN 06... 360 10 50 0.3 <1 <1 110 <0.01 2 0.02 AUG 01... I I I 286 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 fro Quebrada Yagruma, and 2.8 i (4.5 km) southeast of Moca. DRAINAGE AREA.--71.2 sq mi (184.4 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--July 1967 to current year. GAGE.--Water-stage recorder. Elevation of gage is 45 ft (14 m), from topographic map. REMARKS.--Estimated daily discharges: May 8. Records fair except those for estimated daily discharges which are poor. AVERAGE DISCHARGE.--18 years (1968-85), 302 cu ft/s (8.553 cu /s), 57.60 in/yr (1,463 ma/yr), 218,800 acre-ft/yr (270 cu hm/yr); median of yearly mean discharges, 290 cu ft/s (8.21 cu m/s), 210,000 acre-ft/yr (260 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 69,000 cu ft/s (1,950 cu m/s), Sept. 16, 1975, gage height, 36.6 ft (11.16 m) from slope-area measurement, but may have been exceeded by flood of Oct. 23, 1974, from rating curve extended above 2,600 cu ft/s (73.6 cu m/s) on basis of slope-area and contracted-opening measurements of peak flow; minimum discharge, 16 cu ft/s (0.453 cu m/s), Apr. 17-19, 1979. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 11,300 cu ft/a (320 cu m/s) and maximum (1): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (18) Date Time (cu ft/a) (cu m/s) (ft) (01) Oct. 5 1930 17,300 490 25.01 7.623 May 18 1630 132,800 929 829.65 9.037 Oct. 6 1945 23,800 674 27.19 8.288 May 19 2015 24,800 702 27.48 8.376 May 7 2115 14,800 419 24.01 7.318 June 25 2115 25,700 728 27.76 8.461 May 13 2030 13,000 368 23.22 7.077 Minimum discharge, 32 cu ft/s (0.906 cu m/s), Mar. 18. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 289 288 100 76 46 51 44 85 121 160 278 141 2 269 522 99 69 45 61 45 94 114 352 161 131 3 244 567 98 68 45 45 41 336 108 162 335 143 4 227 378 94 65 41 48 41 259 104 126 168 186 5 3590 282 90 70 41 38 40 363 106 119 127 127 6 6060 228 88 119 42 35 41 577 109 110 504 162 7 859 255 87 122 39 37 40 3270 128 105 2430 216 8 371 263 85 69 40 34 61 800 141 259 1780 136 9 359 243 82 65 41 39 196 274 193 152 408 125 10 378 203 96 63 38 36 392 192 215 269 230 143 11 1330 191 94 62 39 68 1320 196 191 157 186 131 12 1850 178 84 61 41 46 1450 223 197 293 226 115 13 885 166 81 60 50 37 744 2170 114 150 292 115 14 696 161 79 60 61 44 220 383 100 115 337 116 15 1460 160 78 60 51 37 182 157 95 1140 278 111 16 650 150 79 58 49 34 164 139 116 226 175 108 17 359 165 86 56 46 36 167 1820 163 472 307 127 18 628 148 79 56 40 33 154 10100 145 1720 265 118 19 1220 139 76 56 41 34 173 6770 604 482 162 857 20 717 133 75 53 38 487 123 1100 1470 356 147 275 21 539 130 73 53 37 522 204 407 329 226 220 196 22 313 126 78 52 39 308 407 307 173 168 188 155 23 279 123 77 53 35 138 268 257 133 150 140 155 24 339 119 89 51 44 76 169 230 188 293 129 982 25 292 118 77 50 40 64 130 198 5220 149 497 245 26 239 118 73 49 39 56 120 178 1070 189 232 161 27 219 113 75 49 43 60 106 163 258 154 186 150 28 211 109 81 49 40 62 100 149 191 125 159 170 29 221 107 74 49 --- 56 94 139 164 125 141 891 30 342 104 71 45 54 92 132 159 128 178 699 31 400 --- 75 47 50 --- 126 --- 115 192 --- TOTAL 25835 5987 2573 1915 1191 2726 7328 31594 12419 8747 11058 7387 MEAN 833 200 83.0 61.8 42.5 87.9 244 1019 414 282 357 246 MAX 6060 567 100 122 61 522 1450 10100 5220 1720 2430 982 MIN 211 104 71 45 35 33 40 85 95 105 127 108 CFSM 11.7 2.81 1.17 .87 .60 1.23 3.43 14.3 5.81 3.96 5.01 3.46 IN. 13.50 3.13 1.34 1.00 .62 1.42 3.83 16.51 6.49 4.57 5.78 3.86 AC-FT 51240 11880 5100 3800 2360 5410 14540 62670 24630 17350 21930 14650 CAL YR 1984 TOTAL 123468 MEAN 337 MAX 6920 MIN 25 CFSM 4.73 IN. 64.51 AC-FT 244900 WTR YR 1985 TOTAL 118760 MEAN 325 MAX 10100 MIN 33 CFSM 4.56 IN. 62.05 AC-FT 235600 RIO CULEBRINAS BASIN 287 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 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TUBE DATE TIME INSTANTANEOUS DUCTANCE TUBE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) FEB, 21 1325 37 265 25.0 SEP, 18 0953 110 232 26.5 MAR, 04 1114 45 268 24.5 I I RIO CULEBRINAS BASIN 288 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 i (3.7 ka) northeast of Aguada plaza. DRAINAGE AREA.--97.0 Sq mi (251.2 sq ka). PERIOD OF RECORD.--Water year 1958, 1970 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1984 02... 1100 352 265 7.80 24.5 80 7.7 93 11 K14000 9200 FEB 1985 07... 1130 40 380 7.30 26.0 5.0 1.5 18 130 -- K190000 MAR 28... 1000 100 449 7.40 24.0 10 5.1 60 41 42000 47000 JUN 06... 1030 128 307 8.20 27.0 6.1 7.1 89 12 K1200 K80 AUG 1... 1020 179 307 8.20 27.0 27 5.2 65 <10 670 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 1984 2... 110 35 4.6 9.6 0.4 2.0 109 9.4 9.8 FEB 1985 07... 160 2 48 8.6 16 0.6 9.2 153 <0.5 21 17 MAR 28... 186 JUN 06... 130 42 5.6 13 0.5 1.9 131 <0.5 9.6 12 AUG 01... 131 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) 3102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) NOV 1984 02... <0.1 24 160 152 177 0.78 0.02 0.80 <0.01 FEB 1985 07... <0.2 34 250 27 <1 0.04 <0.20 <0.06 MAR 28... 13 0.44 0.06 0.50 0.31 1.2 JUN 06... 0.1 29 190 66 17 0.68 0.02 0.70 0.12 0.58 AUG 1... 24 0.78 0.02 0.80 0.10 0.4 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) NOV 1984 2... 0.4 1.2 5.3 0.07 FEB 1985 07... 1.9 1.10 2 100 30 1 3 90 MAR 28... 1.5 2.0 8.9 0.92 JUN 06... 0.7 1.4 6.2 0.24 <1 <100 <20 1 6 <10 AUG 01... 0.5 1.3 5.8 0.08 K = non-ideal count RIO CULEBRINAS BASIN 289 50149100 RIO CULEBRINAS NEAR AGUADA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 RRABLE 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 HO) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) NOV 1984 02... FEB 1985 07... 3300 <1 600 0.2 <1 <1 50 <0.01 <1 0.09 MAR 28... 0.1 JUN 06... 1000 49 60 <0.1 <1 <1 20 <0.01 3 <0.01 AUG 01... CHLOR- DI- DI- PCB, ALDRIN, DANE, DDD, DDS, 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) AUG 1985 01... 1020 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 0.04 <0.01 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) AUG 1985 01... <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- 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) (UO/L) AUG 1985 01... <0.01 <0.01 <0.01 <0.01 <0.1 <0.1 <1 <0.01 I I I I I I I I I I I I I I I I I I I I I 292 DISCHARGE AT PARTIAL-RECORD STATIONS As the number of streams on which streamflow information is likely to be desired far exceeds the number of stream-gaging stations feasible to operate at one time, the Geological Survey collects limited streamflow data at sites other than stream-gaging stations. When limited streamflow data are collected on a systematic basis over a period of years for use in hydrologic analyses, the site at which the data are collected is called a partial-record station. Data collected at these partial-record stations are useable in low-flow or floodflow analyses, depending on the type of data collected. In addition, discharge measurements are made at other sites not included in the partial- record program. These measurements are generally made in times of drought or flood•to give better areal coverage to those events. Those measurements and others collected for some special reason are called measurements at miscellane­ ous sites. Records collected at partial-record stations are presented in two tables. The first is a table of dis­ charge measurements at low-flow partial-record stations and the second is a table of annual maximum stage and dis­ charge at crest-stage stations. Low-flow partial-record stations Measurements of streamflow in the areas covered by this report made at low-flow partial-record stations are given in the following table. These measurements were made during periods of base flow when streamflow is pri­ marily fro ground-water storage. These measurements, when correlated with the simultaneous discharge of nearby stream when continuous records are available, will give a picture of the low-flow potentiality of stream. Discharge measurements made at low-flow partial-records stations during water year 1985 PUBLICATION RECORD STATION NUMBER STATION NAME LOCATION AND BASIN DRAINAGE AREA sq i (sq km) DATE TIME STREAM- SPE- TEMPER- FLOW CIFIC CONDUC- ATURE ofs TANCE (cms) umhos deg C Quebrada de los Cedros basin 50007000 Quebrada de los Cedros near Isabela, PR Lat 18 30 46, long 67 05 47 Hydrologic unit 21010002. On dirt road, 4.7mi (7.6km) west of Isabela, and 0.5 i (0.8 km) upstream fro mouth. 6.91 4 (17.90) /09/86 1400 Dry Rio Guajataca basin 50011400 Rio Guajataca above mouth near Quebradillas, PR Lat 18 28 31, long 66 57 46 Hydrologic unit 21010002. At ford, 1.7 i (2.7 km) up­ stream from bridge on Hwy 2, 2.1 i (3.4 km) fro the Atlantic Ocean, 6.6 i (10.6 km) downstream fro Lego Guajataca, and 1.6 1 (2.6 km) west of Quebradi­ llas. 23.7 (61.4) 4/09/85 1445 No Meas Rio Camuy basin 50015800 Rio Camuy at Capaez, PR Lat 18 27 49, long 66 49 58 Hydrologic unit 21010002. At 1.1 i (1.7 km) south of Purification Plant of Heti­ 22.0 llo, about 1.4 i (2.2 km) (57.0) south of Hwy 2, and 1.8 i (2.9 km) upstream fro mouth. 4/12/85 1830 139 (3.94) 370 24.0 Rio Grande de Arecibo basin 50029000 Rio Grande de Arecibo at Central Cambalache, PR Lat 18 27 20, long 66 42 10, Hydrologic unit 21010002, at bridge on unimproved road, 200 about 500 ft. (152 ) (520) upstream fro Central Cambalache, near Hwy 2, 13.9 i (22.4 km) downstream fro Dos Bocas Reservior, 1.9 mi (3.1 km) downstream from Rio Tanana and 1.6 i (2.6 km) southeast of Arecibo. 4/3/85 1330 145 (4.11) Rio Cibuco basin 50039000 Rio Indio near Vega Baja, PR Let 18 26 19, long 66 22 13 Hydrologic unit 21010002. At bridge on Hwy 160, 0.6 i (1.0 km) upstream from Rio Cibuco, and 1.2 i (1.9 km) southeast of Vega Baja. 26.7 (69.2) 4/10/85 1125 17.1 533 (0.48) 24.0 I I I I I I I I I I I I I I I I I I I 293 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION STATION LOCATION NUMBER NAME AND BASIN Rio de la Plata basin 50045800 Rio Lajas at Toa Lat 18 23 39, long 66 15 16 Alta, PR Hydrologic unit 21010005. At bridge on Hwy 165, 0.2 Ili (0.3 km) upstream from Rio de la Plata, and 0.5 mi (0.8 km) northwest of Toa Alta. Rio Hondo basin 50047502 Rio Hondo at Let 18 23 51, long 66 09 22 Bayamon, PR Hydrologic unit 21010005. At bridge on Hwy 2, 700 ft (213 ) east of Hwy 2 and Calle Parque intersection, and 0.7 i (1.2 km) south of sewage treatment plant. 50047604 Quebrada Santa Catalina Lat 18 24 05, long 66 09 43 at Bayamon, PR Hydrologic unit 21010006. 700 ft (213 ) downstream fro bridge on Hwy 2 and 0.2 i (0.3 km) upstream fro mouth. 50047508 Cano de Quebrada Lat 18 24 27, long 66 09 38 Catalina at Bayamon, PR Hydrologic unit 21010005. At bridge on new Hwy 167, 0.7 i (1.1 km) north of Hwy 2 and Calle Parque intersec­ tion, and 0.2 i (0.3 km) upstream fro sewage treat­ ment plant. 50047525 Rio Hondo II near Lat 18 25 19, long 66 10 38 Bayamon, PR Hydrologic unit 21010005. At bridge on Hwy 872 and 0.7 i (1.1 km) downstream fro bridge on Hwy 22. Rio de Bayamon basin 50048510 Rio de Bayamon at Flood Let 18 24 29, long 66 09 04 Channel at Bayamon, PR Hydrologic unit 21010005. At bridge on Hwy 890, 1.0 i (1.6 km) downstream fro bridge on Hwy 2, and 3.2 mi (5.1 km) upstream fro mouth. Rio Puerto Nuevo basin 50049000 Rio Piedras at Rio Lat 18 23 48, long 66 03 24 Piedras, PR Hydrologic unit 21010005. On left bank, at bridge on Hwy 1, 0.3 i (0.5 km) southwest of Rio Piedras Plaza, and 0.4 i (0.6 km) downstream from diversion for water supply. 50049310 Quebrada Josefina at hat 18 24 33, long 66 04 36 Pinero Avenue, PR Hydrologic unit 21010005. At bridge on Pinero Ave, and 0.4 i (0.6 km) upstream fro junction with Rio Pie- dras. DRAINAGE STREAM- SPEC- TEMPER- AREA FLOW CIFIC sq i DATE TIME CONDUC- ATURE cfs TANCE (sq km) (cms) *mhos deg C 8.60 4/10/85 1625 5.63 578 25.5 (22.27) (0.16) 7.59 4/12/85 1441 13.1 690 28.5 (19.66) (0.37) 2.60 4/11/85 1110 0.89 740 26.5 (6.47) (0.025) 0.65 4/11/86 1230 0.15 590 25.5 (1.68) (0.004) 3.18 4/11/85 0935 1.75 797 25.5 (8.24) (0.05) 73.2 4/12/85 1502 50.3 410 29.0 (189.6) (1.42) 12.6 4/08/85 1450 10.2 422 27.0 (32.4) (0.29) 19.0 4/08/86 1220 2.83 400 31.5 (49.2) (0.080) I I I I I I I I I I I I I I I I I I I 294 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM- SPE- TEMPER- AREA FLOW CIFIC NUMBER NAME AND sq i DATE TIME CONDUC- ATURE ofs TANCE BASIN (sq km) (cms) Limbos deg C Rio Puerto Nuevo basin 60049600 Quebrada Margarita at Caparra Heights, PR Let 18 24 33, long 66 06 18 Hydrologic unit 21010005. At bridge on Franklin D. Roosevelt Ave, at San Pa­ trioio Plaza and Fort Bu­ ohannan interchange with 1.82 (4.71) 4/08/85 1720 38.7 217 (1.10) 27.0 Hwy 2, and 0.1 mi (0.2 km) south of Caparra Heights. Quebrada Blasina basin 50050300 Quebrada Blasina near Carolina, PR Lat 18 23 27, long 65 58 28 Hydrologic unit 21010005. At bridge on Hwy 3, 1.4 i (2.3 km) south of Valle A- rriba Heights, and 1.2 i 2.96 (7.67) 4/08/85 0825 5.67 (0.16) 538 26.0 (1.9 km) west-southwest of Carolina. Rio Grande de Loiza basin 50051010 Rio Grande de Loiza below Rio Emajagua, PR Lat 18 07 23, long 65 59 18 Hydrologic unit 21010005. 200 ft (61 ) below junc­ 12.2 (31.6) 4/08/85 1155 20.8 137 (0.59) 26.0 tion with Rio Emajagua and 400 ft (122 a) north of Hwy 181 and Hwy 745 intersection. 50051140 Rio Grande de Loiza at Jagual, PR Let 18 09 29, long 65 58 48 Hydrologic unit 21010005. 200 ft (61 ) east of Jagual School on Hwy 181 and 1.7 17.8 (46.1) 4/08/86 1300 30.2 153 (0.86) 27.0 i (2.8 km) above junction with Rio Cayaguas. 50052300 Rio Grande de Loiza at San Lorenzo North, PR Let 18 11 39, long 65 57 46 Hydrologic unit 21010006. Above sewage treatment plant 46.0 on north aide of San Lorenzo, (119.1) 4/08/85 1408 54.6 173 (1.55) 30.0 0.2 i (0.3 km) northwest of the plaza, and 1.6 i (2.6 km) downstream fro Rio Cayaguas. 50052700 Rio Grande de Loiza at Hwy 183, PR Lat 18 12 22, long 65 59 23 Hydrologic unit 21010006. 2.1 i (3.4 km) northwest of 50.9 Plaza de San Lorenzo and 1.8 (131.8) 4/08/85 1414 58.1 206 (1.64) 31.5 i (2.9 km) downstream fro bridge on Hwy 181. 50052900 Quebrada lea Basbuas at Let 18 13 31, long 66 00 58 south, PR Hydrologic unit 21010005. 300 ft (91 ) upstream fro 2.33 (6.03) 4/09/85 1645 0.77 582 (0.022) 29.0 bridge on Hwy 183 and 900 ft (275 ) above junction with Rio Grande de Loiza. 50053300 Quebrada Beatriz above Lat 18 11 15, long 66 03 04 Rio Turabo, PR Hydrologic unit 21010005. 1,400 ft (425 ) downstream fro bridge on Hwy 766 and 5.65 (14.63) 4/08/85 0948 3.89 252 (0.11) 25.0 400 ft (120 a) above junction with Rio Turabo. 50053500 Rio Turabo below Let 18 11 22. long 66 03 02 Quebrada Beatriz, PR Hydrologic unit 21010005. 0.9 i (1.4 km) downstream fro bridge on Hwy 765 and 17.3 (44.8) 4/08/85 1035 16.6 195 (0.47) 26.5 400 ft (120 a) below junction with Quebrada Beatriz. I I I I I I I I I I I I I I I I I DISCHARGE AT PARTIAL-RECORD STATIONS 295 Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM- SPE- TEMPER- AREA FLOW CIFIC NUMBER NAME AND sq i DATE TIME CONDUC- ATURE ofs TANCE BASIN (sq ka) (cm's) limbos deg C Rio Grande de Loiza basin 50054500 Rio Turabo at Caguas, PR Let 18 13 36, long 66 01 40 Hydrologic unit 21010006. 29.3 4/09/85 1610 15.2 243 31.6 At bridge on Hwy 183, 0.9 i (75.9) (0.43) (1.5 ka) southeast of the plaza in Caguas, and 1.3 i (2.1 km) upstream from Rio Grande de Loiza. 50055310 Rio Caguitaa above mouth, PR Let 18 16 22, long 66 01 06 Hydrologic unit 21010006. 0.6 ci (0.7 ka) downstream from bridge on Hwy 30 and 0.4 i (0.7 ka) above junc- tion with Rio Grande de Loiza. 18.0 4/09/85 1358 22.2 660 29.0 (46.6) (0.63) 50056410 Rio Bairoa at mouth, PR Let 18 15 47, long 66 01 09 Hydrologic unit 21010006. 0.8 i (1.2 km) downstream from bridge on Hwy 30 and 0.4 i (0.6 km) above junc- tion with Rio Grande de Loiza. 50055500 Quebrada Honda at Las Let 18 13 15, long 65 49 57 Torres, PR Hydrologic unit 21010005.At bridge on Hwy 31, 100 ft (30 ) east of Hwy 31 and Hwy 936 intersection, and 1.8 i (2.9 km) above junc- tion with Rio Gurabo. 7.51 4/09/85 1452 4.26 430 30.0 (19.46) (0.12) 1.15 4/08/85 1015 0.21 450 23.5 (2.98) (0.006) 50056600 Rio Gurabo at Ceiba Norte, PR Lat 18 13 29, long 65 51 34 Hydrologic unit 21010005. 0.4 i (0.6 km) downstream 12.0 4/08/85 0915 5.13 390 25.0 from bridge on Hwy 31 and (31.1) (0.15) 0.2 i (0.4 km) below junc- tion with Quebrada Honda. 50065700 Rio Gurabo at El Mango, PR Let 18 13 56, long 65 52 52 Hydrologic unit 21010005. 1.2 i (2.0 km) upstream fro bridge on Hwy 31 and 0.2 mi (0.4 km) above junc- tion with Quebrada Grande. 16.5 4/10/86 1102 5.93 390 27.5 (42.7) (0.17) 50056000 Rio Valenciano near Las Lat 18 10 37, long 65 54 21 Piedras, PR Hydrologic unit 21010005. At bridge on Hwy 183 (k 17.3), and 3.2 i (5.1 km) west of Las Piedras. 6.86 (17.74) 4/10/85 0935 7.18 (0.20) 214 24.0 50056550 Rio Valenoiano at mouth, PR 50056600 Rio Gurabo near Juncos, PR 50057015 Rio Gurabo below Hwy 943, PR Lat 18 14 13, long 65 55 13 Hydrologic unit 21010005. 0.6 i (1.0 km) downstream from bridge on Hwy 31 and 1,000 ft (305 ) above junc- tion with Rio Gurabo. Let 18 14 38, long 65 55 25 Hydrologic unit 21010005. At bridge on Hwy 185 and 0.4 i (0.6 km) below junc- tion with Rio Valenciano. Lat 18 15 50, long 65 58 41 Hydrologic unit 21010005. 0.6 mi (0.9 km) northeast of Plaza de Gurabo and 0.7 mi (1.2 km) downstream from bridge on Hwy 181. 19.0 4/10/85 1203 13.4 378 27.5 (49.2) (0.38) 50.0 4/10/85 1258 22.1 367 29.5 (129.5) (0.63) 62.4 4/10/85 1419 29.9 405 29.0 (161.6) (0.85) I I I I I I I I I I I I I I I I I I I I I 296 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM- SPE- TEMPER- AREA FLOW CIFIC NUMBER NAME AND sq mi DATE TIME CONDUC- ATURE cfs TANCE BASIN (sq km) (cms) umhos deg C Rio Grande de Loiza basin 50058400 Rio Canas above Lago Loiza, PR 50069000 Lago Loiza at Dam Site, PR Lat 18 17 34, long 66 02 33 Hydrologic unit 21010005. At bridge about 2000 ft (610 ) off Hwy 1, 1.0 i (1.6km) upstream fro Lago Loiza, 1.0 mi (1.6 km) north of La Barra, and 4.0 i (6.4 km) north of Caguas. 7.63 4/09/85 1237 5.09 318 26.5 (19.76) (0.14) Let 18 19 49, long 66 01 00 Hydrologic unit 21010005. At pumphouse at damsite 208 4/09/85 1137 4.79 217 26.5 and 1.9 i (3.1 km) south (539) (0.14) of Trujillo Alto Plaza. 50059200 Quebrada Grande at La Lat 18 20 28, long 66 59 20 Gloria, PR Hydrologic unit 21010005, 400 ft (122 ) downstream from bridge on Hwy 181, 200 ft (61 ) below junction with Quebrada Grande, and 1.5 i (2.4 km) above junc- tion with Rio Grande de Loi- za. 12.0 4/08/85 1346 4.31 604 25.5 (31.1) (0.12) 50060000 Rio Grande de Loiza above Carolina, PR 60061200 Rio Canovanillas at Carruzos, PR 50061500 Rio Canovanillas at Loiza, PR 50061900 Rio Canovanas at La Marina, PR 50062000 Rio Canovanas at Loiza, PR Lat 18 19 03, long 65 54 16 Hydrologic unit 21010005. At bridge on road 600 ft (152 a) off Hwy 185, and 0.7 i (1.1 km) east of Jesus T. Pinero School. Let 18 21 01, long 65 53 51 Hydrologic unit 21010006. 100 ft (30 ) east of Hwy 185 and 0.9 i (1.6 km) downstream from bridge on Hwy 957. Lat. 18 22 63, long 66 53 33 Hydrologic unit 21010005.At bridge on Hwy 958 and 0.3 i (0.6 km) east of Loiza. Let 18 22 10, long 65 57 50 Hydrologic unit 21010005. 0.5 i (0.8 km) west of Tru- 230 jillo Bajo and 0.2 i (0.3 (596) km) northwest of intersection of Hwys 863 and 858. 4/08/85 1135 No Meas 298 29.0 9.10 4/09/86 1250 3.42 600 29.0 (23.67) (0.097) 14.6 4/09/85 1430 18.3 255 26.0 (37.8) (0.52) 17.0 4/09/85 1025 11.0 263 26.5 (44.0) (0.31) 60060200 Quebrada Maracuta at Lat 18 22 11, long 65 67 28 Trujillo Bajo, PR Hydrologic unit 21010006. At bridge on Hwy 853 and 10.2 4/08/85 1030 4.05 580 27.5 0.3 i (0.5 km) above junc- (26.4) (0.11) tion with Rio Grande de Loi- za. 50061000 Rio Grande de Loiza at Lat 18 22 39, long 65 57 08 Carolina, PR Hydrologic unit 21010006. 243 4/08/85 0910 No Flow 333 28.0 At bridge on Hwy 3, 0.5 (629) i (0.8 km) southeast of Ca- rolina Plaza, and 9.1 i (14.6 km) upstream fro mouth. Lat 18 22 44, long 66 56 00 Hydrologic unit 21010005.At bridge on Hwy 3, 0.9 i (1.4 16.5 4/09/85 0850 7.39 600 26.0 km) upstream fro Rio Gran- (42.7) (0.21) de Loiza, and 1.0 i (1.6 km) west of Loiza. I I I I I I I I I I I I I I I I I DISCHARGE AT PARTIAL-RECORD STATIONS 297 Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM- SPE- TEMPER- AREA FLOW CIFIC NUMBER NAME AND aq i DATE TIME CONDUC- ATURE cfs TANCE BASIN (sq ka) (cms) umhos deg C Rio Herrera basin 50062500 Rio Herrera near Colonia Lat 18 21 02, long 65 52 00 Dolores, PR Hydrologo unit 21010006. On right bank, at bridge on on Hwy 958, 2.0 i (3.2 ka) south of Colonia Dolores, and 3.2 mi (6.1 km) south- west of Rio Grande. 2.75 4/10/85 1100 5.01 208 24.5 (7.12) (0.14) 50062800 Rio Herrera near Lat 18 22 48, long 65 51 33 Loiza, PR Hydrologic unit 21010005.At bridge on Hwy 3, 1.9 i 3.86 4/10/85 0955 6.07 240 24.5 (3.1 km) west of Rio Gran- (10.00) (0.17) de, and 2.8 i (4.5 km) east of Loins. 50063000 Quebrada Cambalache Lat 18 22 49, long 65 62 04 near Loiza, PR Hydrologic unit 21010005.At bridge on Hwy 3, 2.2 i 1.32 4/10/85 0840 0.43 642 25.5 (3.5 km) east of Loiza, and (3.42) (0.012) 2.5 i (4.0 ka) west of Rio Grande. Rio Espiritu Santo basin 50063540 Rio Espiritu Santo at Lat 18 20 22, long 65 49 42 Camp Eliza Colberg, PR Hydrologic unit 21010005. 5.27 4/11/85 0905 10.8 78 22.0 3.1 i (4.9 km) northwest of (13.65) (0.31) Pico El Yunque and 0.8 mi (1.3 ka) below junction with Quebrada Sonadora. 50063850 Quebrada Jimenez near Lat 18 21 36, long 65 48 47 Rio Grande, PR Hydrologic unit 21010005. 3.63 4/11/85 1030 5.31 134 25.0 300 ft (91 ) upstream fro (9.40) (0.15) Rio Espiritu Santo and 1.9 i (3.1 km) southeast of Rio Grande. 50064200 Rio Grande near El Verde, PR 50064500 Rio Grande at Rio Grande, PR Lat 18 20 43, long 65 50 30 Hydrologic unit 21010006.On left bank, 400 ft (120 a) upstream from bridge on Hwy 960, 500 ft (150 ) south- west of junction of Hwys 956 & 960, 1.1 i (1.8 km) west of El Verde, and 2.7ai (4.3km) south of Rio Grande. 7.31 4/10/85 1440 16.8 122 26.0 (18.93) (0.48) Lat 18 22 40, long 65 49 28 Hydrologic unit 21010005.At bridge on Hwy 3, 0.5 i (0.8 10.4 4/10/85 1325 20.4 157 27.0 km) southeast of Rio Grande, (26.9) (0.58) and 0.8 i (1.3km) upstream fro Rio Espiritu Santo. 50064900 Quebrada Juan Gonzalez Lat 18 22 37, long 65 48 04 near Rio Grande, PR Hydrologic unit 21010005.At bridge on Hwy 955, 800 ft (244 ) upstream from bridge on Hwy 3, and 1.5 i (2.4 km) above junction with Rio Es- pirutu Santo. 2.17 4/11/85 1215 1.60 275 25.5 (5.62) (0.045) I I I I I I I I I I I I I I I I I I I 298 STATION STATION NUMBER NAME 50065700 Rio Mameyes at Hwy 191 at Mameyes, PR 50066000 Rio Mameyes at Maaeyes, PR DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued LOCATION DRAINAGE AREA AND aq i BASIN (sq km) Rio Mameyes basin Let 18 22 03, long 65 46 14, Hydrologic Unit 21010006, 0.2 i (0.3 km) upstream fro Quebrada Anon, 0.3 i (0.5 ka) downstream fro Quebrada Tabonuco, and 0.3 (0.5 km) south of Mameyes. Let 18 22 30, long 65 45 50 Hydrologic unit 21010005. At bridge on Hwy 3, 0.5 mi (0.8 km) downstream fro Quebrada Anon, 0.5 i (0.8 km) east of Mameyes (Palmer 11.8 (30.6) i 13.5 (35.0) Post Office), and 3.1 i (5.0 km) west of Luquillo. Quebrada Mate. de Platano basin 50066500 Quebrada Mata de Platano Let 18 22 52, long 65 43 16 near Luquillo, PR 50068000 Rio Sabana at Luquillo, PR 50069000 Rio Pitahaya near Luquillo, PR 50069300 Tributary to Rio Juan Martin at Hwy 3, PR 50069350 Rio Juan Martin above mouth, PR 50069400 Quebrada Fajardo at Hwy 194, PR Hydrologic unit 21010005. At bridge on Hwy 3. 0.4 i (0.6 km) northwest of Lu­ quillo Plaza, and 0.3 i (0.5 km) above mouth. Rio Sabana basin Let 18 22 15, long 65 42 51 Hydrologic unit 21010005.At Hwy 3 bridge and 0.4 i (0.6 km) southwest of Luquillo. Rio Pitahaya basin Lat 18 21 32, long 65 42 03 Hydrologic unit 21010005.At bridge on Hwy 3, 1.6 i (2.6 km) southeast of Luquillo, and 1.7 i (2.7 ka) upstream fro Rio Sabana. Rio Juan Martin basin Let 18 21 14, long 65 40 69 Hydrologic unit 21010005.At bridge on Hwy 3 and 200 ft (61 ) above junction with Rio Juan Martin. Let 18 21 44, long 65 40 35 Hydrologic unit 21010006. 0.8 mi (1.2 km) downstream fro bridge on Hwy 3 and 0.4 i (0.7 km) above mouth. Quebrada Fajardo basin Lat 18 20 49. long 65 39 55 Hydrologic unit 21010005. At bridge on Hwy 194, 0.5 Jai (0.8 ka) east of Hwy 194 and Hwy 3 intersection, and 1.5 i (2.4 km) above south. 2.38 (6.16) 7.06 (18.26) 4.51 (11.68) 0.53 (1.37) 2.41 (6.24) 1.16 (3.00) DATE STREAM- SPE- TEMPER- FLOW CIFIC TIME CONDUC- ATURE ofs TANCE (ems) umhos deg C 4/19/85 1205 51.9 25.0 (1.47) 4/11/85 1330 27.6 148 27.5 (0.78) 4/08/85 1101 No Flow 605 27.0 4/08/85 1204 7.90 106 26.0 (0.22) 4/08/86 1257 4.58 164 27.0 (0.13) 4/08/85 1322 0.03 602 28.0 (0.001) 4/08/85 1406 0.47 455 29.5 (0.013) 4/08/86 1467 0.13 496 31.0 (0.004) I I I I I I I I I I I I I I I I I DISCHARGE AT PARTIAL-RECORD STATIONS 299 Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM- SPE- TEMPER- AREA FLOW CIFIC NUMBER NAME AND sq i DATE TIME CONDUC- ATURE cfs TANCE BASIN (sq km) (cms) uahos deg C Rio Fajardo basin 50071200 Rio Fajardo at Vapor below Confluence, PR Let 18 18 28, long 65 40 10 Hydrologic unit 21010005. 19.4 4/09/85 0837 17.9 118 26.0 1.7 i (2.8 km) southwest of (50.2) (0.51) Plaza de Fajardo and 1.4 ai (2.3 km) upstream Pros bridge on Hwy 3. 50072000 Rio Fajardo at Fajardo, PR 50072700 Rio Demajagua at Demajagua, PR 50072800 Quebrada Ceiba at Ceiba, PR Let 18 19 11, long 65 39 07 Hydrologic unit 21010005. At bridge on Hwy 3, 0.5 i (0.8 km) south of Fajardo, and 2.5 i (4.0 km) upstream fro mouth. Quebrada Ceiba basin Let 18 16 25, long 65 38 25 Hydrologic unit 21010005.At bridge on Hwy 3, 0.8 i (1.3 km) northeast of Plaza de Ceiba, and 0.8 i (1.3 km) above mouth. Quebrada Aguas Clams basin 50072600 Quebrada Mata Redonda Let 18 19 34, long 65 39 00 near Fajardo, PR Hydrologic unit 21010005.At bridge on Hwy 3, 1.2 i (2.0 km) south of Plaza de Fa- jardo, and 1.7 i (2.7 km) above junction with Rio Fa- jardo. 21.6 4/09/85 0946 18.9 122 26.5 (55.9) (0.54) 1.34 4/09/85 0859 No Flow 593 26.5 (3.47) 2.15 4/09/85 1102 1.24 486 29.5 (5.57) (0.035) Rio Demajagua basin Let 18 17 10, long 65 38 21 Hydrologic unit 21010005. At bridge on Hwy 3, 200 ft 1.61 4/09/85 1020 0.27 315 27.0 (61 ) south of Hwy 3 and (4.17) (0.008) Hwy 982 intersection, and 0.3 mi (0.5 ka) above mouth. 50072900 Quebrada Aguas Claras Let 18 16 03, long 65 38 20 near Ceiba, PR Hydrologic unit 21010005.At bridge on Hwy 979 and 0.6 i 0.83 4/09/85 1136 0.36 418 31.5 (0.9 ka) above south. (2.15) (0.010) 50073200 Rio Daguao at Daguao, PR 50073300 Rio Daguao above mouth, PR Lat 18 13 36, long 65 39 31 Hydrologic unit 21010005. At bridge 650 ft (200 ) downstream fro bridge on Langley Drive and 0.9 i (1.4 km) above mouth. Rio Daguao basin Lat 18 13 42, long 65 40 39 At railroad bridge, 0.1 mi (0.2 ka) downstream fro 2.26 4/09/85 1245 0.63 470 28.0 bridge on Hwy 3, 0.3 ai (0.5 (5.85) (0.018) km) east of Daguao, and 2.8 i (4.5 km) upstream fro mouth. 4.29 4/09/85 1148 No Flow 392 30.0 (11.11) I I I I I I I I I I I I I I I I I I I I I 300 STATION STATION NUMBER NAME 50073400 Quebrada Palma at Daguao, PR 50079500 Quebrada Botija at Hwy 31, PR 50074000 Rio Santiago at Naguabo, PR 50074010 Tributary to Rio Santiago at Hwy 192, PR 50076000 Rio Blanco near Florida, PR 50077000 Rio Blanoo at Rio Blanco, PR 50077500 Rio Blanco below La Fe, PR 50077600 Quebrada Vaca below La Fe, PR DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued LOCATION DRAINAGE STREAM- SPE- TEMPER- AREA FLOW CIFIC AND sq i DATE TIME CONDUC- ATURE ofs TANCE BASIN (sq km) (cms) umhos deg C Quebrada Palma basin Lat 18 13 16, long 65°41 30 Hydrologio unit 21010005. At bridge on Hwy 3, 0.8 i 4.84 4/09/85 1325 1.88 360 28.0 (1.3 km) southwest of Da- (12.54) (0.053) guao. and 1.7 i (2.7 km) upstream fro mouth. Quebrada Botija basin Lat 18 12 55, long 65°42 25 Hydrologic unit 21010005. At bridge on Hwy 31, 500 ft 1.10 4/09/85 1346 0.18 580 29.5 (152 ) upstream fro bridge (2.85) (0.005) on Hwy 3, and 1.6 i (2.6 km) above mouth. Rio Santiago basin Lat 18 12 57, long 65°43 41 Hydrologic unit 21010005.At bridge on Hwy 31, 0.3 i 4.99 4/09/85 1446 5.85 160 31.0 (0.5 k.)•northeast of Nagua- (12.92) (0.17) bo, 0.4 i (0.6 ka) downstream fro Quebrada Grande, and 2.2 i (3.5 km) upstream from mouth. Lat 18 12 04, long 65°43 33 Hydrologic unit 21010005. At bridge on Hwy 192 and 1.08 4/09/85 1455 No Flow 260 29.0 0.7 i (1.1 km) above Juno- (2.80) tion with Rio Santiago. Rio Blanco basin Lat 18 13 45, long 65 47 06 Hydrologic Unit 2101005. 0.5 i (0.8 Km) upstream from 12.3 4/08/85 1205 36.5 95 25.0 Quebrada Sonadora, 0.7 i (31.9) (1.03) (1.1 km) upstream fro intersection of Hwy 191 and 31, and 0.8 mi (1.3 km) south of Florida. Lat 18 13 09, long 66 48 57 Hydrologic unit 21010005. At bridge on Hwy 91 and 0.4 i 17.6 4/08/85 1055 23.9 122 23.5 (0.6 km) east of Rio Blanco. (45.6) (0.68) Lat 18 12 17, long 65 45 31 Hydrologic unit 21010005. 20.8 4/09/85 1310 29.4 200 26.5 1.9 i (3.0 km) downstream (53.9) (0.83) from bridge on Hwy 31 and 0.7 i (1.1 ka) south of Hwy 31 and Hwy 970 intersec- tion. Lat 18 12 25, long 65 46 04 Hydrologic unit 21010005. 1.1 i (1.8 km) downstream 3.47 4/09/85 1345 2.25 385 28.0 fro bridge on Hwy 31 and (8.99) (0.06) 0.8 i (1.4 km) southeast of Hwy 31 and Hwy 970 intersec- tion. I I I I I I I I I I I I I DISCHARGE AT PARTIAL-RECORD STATIONS 301 Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM- SPE- TEMPER- AREA FLOW CIFIC NUMBER NAME AND sq i DATE TIME CONDUC- ATURE cfs TANCE BASIN (aq km) (ems) umhos deg C Rio Blanco basin 60077700 Rio Blanco at mouth, PR Lest 18 11 17, long 65°43 47 Hydrologic unit 21010005.At bridge on Hwy 3, at mouth, 27.2 4/09/85 1540 46.0 2270 27.0 and 0.8 i (1.2 km) south- (70.4) (1.30) west of Hwy 3 and Hwy 192 intersection. Rio Anton Ruiz basin 50078510 Rio Anton Ruiz at Pasto Let 18 10 26, long 65°47 05 Viejo, PR Hydrologic unit 21010005.At bridge on unimproved road, 300 ft (91 ) north of Hwy 925, and 1.5 i (2.4 km) north of Hwy 3 and Hwy 925 intersection. 5.75 4/09/85 1155 7.26 367 29.0 (14.89) (0.21) 50078700 Rio Anton Ruiz at mouth, PR Lat 18 10 35, long 65°44 23 Hydrologic unit 21010005. At bridge on Hwy 3, 1.8 i (2.9 km) southwest of Hwy 3 a 7.99 and Hwy 192 intersection, (20.69) and 200 ft (61 ) above mouth. 4/09/85 1610 No Flow 15300 27.5 50081000 Rio Humacao at Las Piedras, PR Rio Humacao basin Lat 18 10 27, long 65°52 11 Hydrologic unit 21010005. On left bank about 60ft (18.3 ) off bridge on Hwy 921 6.65 4/09/85 0825 11.3 177 23.0 (km 1.1), 0.6mi (1.0ka) south (17.22) (0.32) -east of junction with Hwy 30, 0.8 i (1.3 km) down- stream from Quebrada Blanca, and 0.8mi (1.3km) south of Las Piedras. Lat 18 09 37, long 65°50 41 Hydrologic unit 21010005.At bridge on Hwy 914 and 1.3 mi (2.1 km) northwest of Humacao. Let 18 08 46, long 65°49 40 Hydrologic unit 21010005.At bridge on Hwy 908 and 460 ft (137 ) above junction with Rio Humacao. Lat 18 07 28, long 65°47 23 Hydrologic unit 21010005. 3.1 i (4.9 km) southeast of Plaza de Humacao and 0.6 i (0.9 km) above mouth. Rio Candelero basin 50081500 Rio Humacao near Humacao, PR 50081900 Quebrada Mariana at Patagonia, PR 50082500 Rio Humacao Flood Channel near mouth, PR 9.23 4/09/85 1036 10.9 224 25.0 (23.91) (0.31) 5.76 4/09/85 0935 6.98 280 26.0 (14.92) (0.20) 25.1 4/11/85 0835 29.7 535 25.0 (65.0) (0.84) 50082600 Rio Candelero at Hwy 909, PR Let 18 06 17, long 65°48 54 Hydrologic unit 21010005.At 3.65 4/10/85 1315 1.40 297 32.5 bridge on Hwy 906, 1.4 i (9.45) (0.04) (2.2 km) downstream fro bridge on Hwy 3, and 1.7 mi (2.7 km) above mouth. I I I I I I I I I I I DISCHARGE AT PARTIAL-RECORD STATIONS 302 Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM- SPE- TEMPER- AREA FLOW CIFIC NUMBER NAME AND sq i DATE TIME CONDUC- ATURE cfs TANCE BASIN (sq km) (cos) umhos deg C Rio Candelero basin 50082700 Rio Candelero at Lat 18 06 09, long 65 47 43 mouth, PR Hydrologic unit 21010006.At bridge on unimproved road, 4.77 4/10/85 1235 1.78 337 29.5 1.3 i (2.1 km) downstream (12.35) (0.05) from bridge on Hwy 906, and 0.4 i (0.7 km) above mouth. Rio Guayanes basin 50082800 Rio Guayanes near Lat 18 04 55, long 65 57 32 Colonia Laura, PR Hydrologio unit 21010005.On left bank, 1000 ft (305 ) 4.69 4/08/85 0935 9.85 137 23.5 south of Hwy 182, 4.5 i (12.15) (0.28) (7.2km) west of Colonia Laura, and 5.8 mi (9.3 km) north- northwest of Yabucoa. 50082810 Rio Guayanes below Rio hat 18 04 44, long 65 56 54 Arenas, PR Hydrologic unit 21010005. 100 ft (30 ) below junction 7.44 4/08/85 1105 21.4 132 24.0 with Rio Arenas and 2.8 i (19.27) (0.61) (4.6 km) above junction with Quebrada Guayabo. 50083400 Rio Guayanes at Lat 18 03 33, long 65 54 03 Calabasas, PR Hydrologic unit 21010005.At bridge on Hwy 182 and 1.4 17.2 4/09/85 0840 33.1 167 24.0 mi (2.2 km) above junction (44.5) (0.94) with Rio Limones. 50084000 Rio Limones near Lat 18 04 35, long 65 53 42 Yabucoa, PR Hydrologic unit 21010005.At bridge on Hwy 904, 1.2 mi 7.89 4/08/85 1320 15.7 168 30.0 (2.0 km) upstream fro Rio (12.70) (0.44) Guayanes, and 2.0 i (3.2 km) northwest of Yabucoa. 50085000 Rio Guayanes at hat 18 03 42, long 65 52 33 Yabucoa, PR Hydrologic unit 21010005.At bridge on Hwy 3, 0.5 mi (0.8 26.5 4/09/85 0740 No Flow 163 23.0 km) downstream from Rio Li- (68.6) ones, and 0.7 i (1.1 km) north of Yabucoa. 50085100 Rio Guayanes at Central Lat 18 03 57, long 65 52 22 Roig, PR Hydrologic unit 21010005. At abandonend lake control 26.6 (68.9) 4/11/85 1005 36.2 168 (1.03) 23.5 structure, 0.2 mi (0.3 km) northeast of Central Roig, 1.0 mi (1.6 km) downstream from Rio Limones, and 1.0 mi (1.6 km) northeast of Yabucoa. 50085700 Rio Guayanes near Lat 18 04 16, long 65 50 14 mouth near Playa de Guayanes, PR Hydrologic unit 21010005. At dirt road crossing, south 27.6 4/10/85 0915 44.3 167 24.5 of Hwy 906, and 3.1 mi (5.0 (71.5) (1.25) km) northeast of Yabucoa. 50086000 Rio del lngenio near hat 18 05 03, long 65 51 27 Yabucoa, PR Hydrologic unit 21010005.At bridge on Hwy 3, 0.2 mi (0.3 2.46 4/11/85 1235 3.67 213 29.0 km) upstream from Quebrada (6.37) (0.10) Cortadera and Aguacate, and 2.6 mi (4.2 km) northeast of Yabucoa. I I I I I I I I I I I I I I I I DISCHARGE AT PARTIAL-RECORD STATIONS 303 Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM- SPE- TEMPER- AREA FLOW CIFIC NUMBER NAME AND sq i DATE TIME CONDUC- ATURE AREA FLOW CIF1C cfs TANCE BASIN (sq ka) (ems) umhos deg C Rio Guayanes basin 50086300 Rio del Ingenio near Lat 18 04 20, long 65 50 02 Playa de Guayanes, PR Hydrologic unit 21010006. 1.8 i (2.9 km) downstream 11.5 4/10/85 1020 8.74 290 28.0 from bridge on Hwy 3 and (29.8) (0.25) 0.6 i (1.0 km) above junc­ tion with Rio Guayanes. 50086500 Rio Guayanes at Playa Lat 18 03 45, long 65 49 42 de Guayanes, PR Hydrologic unit 21010005. At old railroad crossing, 0.2 i (0.3 ka) from mouth, 34.0 4/10/85 1130 49.5 166 27.5 0.4 i (0.6km) west of Pla- (88.1) (1.40) ya de Guayanes, and 3.5 i (5.6 km) northeast of Yabu- coa. Cano Santiago basin 50087100 Cano Santiago at Lat 18 03 25, long 65 52 33 Hwy 3, PR Hydrologic unit 21010005.At 3.81 4/08/85 1140 5.38 246 27.0 bridge on Hwy 3, 0.5 i (0.8 (9.87) (0.15) km) north of Plaza de Yabucoa, and 0.3 i (0.5 km) below junc- tion with Quebrada Aguas Largas. 50087200 Cano Santiago near Lat 18 03 18, long 65 50 59 Central Roig, PR Hydrologic unit 21010005. 6.04 4/11/85 1110 5.70 395 27.5 At service road and railroad (15.64) (0.16) bridge, 1.8 mi (2.9 km) east of Central Roig, and 2.0 i (3.2 km) east of Yabucoa. Rio Maunabo basin 50091000 Rio Maunabo at Lat 18 00 24, long 65 54 19 Maunabo, PR Hydrologic unit 21010005. 4/09/85 1000 16.5 234 26.0 At bridge on Hwy 3, 0.4 i 12.4 (0.47) (0.6 km) southwest of Mau- (32.1) nabo, and 1.3 mi (2.1 km) upstream fro mouth. Rio Jacaboa basin 50091500 Rio Jacaboa at Hacienda Lat 17 58 48, long 65 58 03 San Isidro, PR Hydrologic unit 21010004. At bridge on Hwy 3, 0.4 i (0.6km) upstream fro south, 5.23 4/09/85 1340 1.07 320 30.5 0.4 i (0.6 km) east of Ha- (13.5) (0.030) oienda San Isidro, and 4.8 ci (7.7 km) southwest of Maunabo. Rio Chico basin 50091800 Rio Chico at Lat 17 59 16, long 66 00 18 Providenoia, PR Hydrologic unit 21010004. At flat low bridge 200 ft 4.93 4/09/85 1430 0.71 1020 31.0 (61 ) south of Hwy 3, 0.5 (12.77) (0.020) Jai (0.8 km) above mouth, and 1.5 mi (2.4 Its) south­ east of Patillaa. Rio Grande de Patillas basin 50091950 Rio Grande de Patillas Lat 18 03 48, long 66 02 57 below Quebrada Hydrologic unit 21010004. 8.75 4/10/85 0830 10.9 128 22.0 Sonadora, PR 1,300 ft (395 ) downstream (22.66) (0.31) from bridge on Hwy 184 and 1,000 ft (305 m) below junc­ tion with Quebrada Sonadora. I I I I I I I I I I 304 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM- SPE- TEMPER- AREA FLOW CIFIC NUMBER NAME AND sq mi DATE TIME CONDUC- ATURE cfs TANCE BASIN (sq ka) (cas) umhos deg C Rio Grande de Patillas basin 50094200 Rio Grande de Patillas at Patillas, PR Lat 18 00 15, long 66 01 27 Hydrologic unit 21010004. At bridge on Hwy 3, 0.7 mi (1.1 km) west of Patillas, 27.9 (72.3) 4/10/85 0950 1.75 375 (0.050) 27.0 and 1.9 mi (3.1km) upstream from mouth. 50094300 Rio Grande de Patillas at Providencia, PR Lat 17 59 20, long 66 00 47 Hydrologic unit 21010004. At abandoned railroad bridge, 29.0 0.5 i (0.8 km) above mouth, (75.1) 4/10/85 1110 3.61 (0.10) 350 29.0 and 0.6 i (1.0 km) west of Providencia. Rio Nigua basin 50094500 Rio Nigua at Lat 17 58 10, long 66 03 41 Arroyo, PR Hydrologic unit 21010004. At bridge on Hwy 178, 0.2 i 8.04 4/10/85 1140 Dry (0.3 km)north of Arroyo, and 3.7 i (6.0 km) east (20.82) of Guayana. Quebrada Salads basin 50094510 Quebrada Salad& near Arroyo, PR Let 17 58 50, long 66 04 23 Hydrologic unit 21010004. At bridge on Hwy 3 and 0.9 i (1.4 km) upstream fro 0.76 (1.97) 4/10/85 1210 0.13 2550 (0.004) 29.5 mouth. Quebrada Corazon basin 50094520 Quebrada Corazon near bat 17 58 58, long 66 04 41 Arroyo, PR Hydrologic unit 21010004.At bridge on Hwy 3 and 1.0 i 4.29 4/10/86 1236 0.20 878 27.0 (1.6 km) above mouth. (11.11) (0.006) Rio Guamani basin 50095500 Rio Guamani near Let 17 57 30, long 66 08 20 Guayana, PR Hydrologic unit 21010004. At railroad bridge, 0.5 mi 12.3 4/09/85 0755 0.05 533 23.5 (0.8 km) downstream from (31.9) (0.001) Hwy 3, 1.2 i (1.9 km) up­ stream fro mouth, and 2.5 mi (4.0 km) southwest of Guayana. Rio Melanin basin 50095900 Rio Melanie near Let 17 57 51, long 66 09 30 Jobos, PR Hydrologic unit 21010004. 3.51 4/09/85 0827 0.40 630 26.5 0.6 i (1.0 km) upstream (9.09) (0.01) from bridge on Hwy 3. Rio Seco basin 50097800 Rio Seco near Central Let 17 58 06, long 66 10 52 Guamani, PR Hydrologic unit 21010004 At bridge on Hwy 3, 0.2 mi 11.1 4/09/85 Dry (0.3 km) north of Central (28.7) Guamani, and 1.2 mi (1.9 km) northwest of Jobos. I I I I I I I I I I I I 305 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM- 8PE- TEMPER- AREA FLOW CIFIC NUMBER NAME AND sq i DATE TIME CONDUC- ATURE cfs TANCE BASIN (sq ka) (ems) umhos deg C Rio Salina (Nigua) basin 50100700 Rio Majada at Rabo del Buey, PR Lat 18 02 17, long 66 14 27 Hydrologic unit 21010004.At 22.2 bridge on Hwy 1, at Rabo del (57.6) 4/09/85 0967 0.79 (0.02) 762 25.0 Buey, 200 ft (61 ) upstream from Rio Lapa, and 5.6 mi (9.0 km) northeast of Sali- nas. 50102000 Rio Salinas at Salinas, PR Lat 17 58 42, long 66 18 17 Hydrologic unit 21010004.At bridge on Hwy 1 and 0.4 mi (0.8 km) west of Salinas Plaza. 62.4 (135.7) 4/09/85 1053 2.17 1200 26.0 (0.06) Rio Jueyes basin 50103000 Rio Jueyes near Jauca, PR Lat 17 58 45, long 66 20 20 Hydrologic unit 21010004.At bridge on Hwy 1, 1.8 i (2.9 8.56 4/09/85 Dry km) east of Jauca, and 2.7 (22.17) mi (4.3 km) west of Salinas Plaza. Rio Coamo basin 50107000 Rio Coamo near Santa Isabel, PR Lat 17 58 36, long 66 25 10 Hydrologic unit 21010004.At bridge on Hwy 1, at Velaz- 69.0 4/09/86 Dry quez, and 1.1 i (1.8 km) (178.7) northwest of Santa Isabel Plaza. Rio Descalabrado basin 50108500 Rio Descalabrado near Santa Isabel, PR Let 17 59 34, long 66 26 35 Hydrologic unit 21010004.At bridge on Hwy 1, 0.9 i (1.4 18.1 km) upstream fro mouth, and (46.9) 3.1 i (5.0 km) northwest 4/09/85 1145 0.24 (0.007) 1020 34.5 of Santa Isabel. Rio Canas basin 50109500 Rio Canes near Santa Isabel, PR Let 17 59 39, long 66 28 35 Hydrologic unit 21010004.At bridge on Hwy 1, 0.5 i (0.8 6.38 4/09/85 Dry km) fro mouth, 0.6 i (1.0 (16.52) km) east of Paslillo, and 5.1 mi (8.2 km) northwest of Santa Isabel Plaza. Rio Jacaguas basin 50112000 Rio Jacaguas at Arus, PR Lat. 18 00 05, long 66 31 50 Hydrologic unit 21010004.At bridge on Hwy 1, at Arus, and 59.3 4/09/85 Dry 4.0 i (6.4 km) south of (153.6) Juana Diaz. 306 STATION NUMBER STATION NAME DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued LOCATION DRAINAGE STREAM- SPE- TEMPER- AREA FLOW CIFIC AND sq mi DATE TIME CONDUC- ATURE ofs TANCE BASIN (sq km) (cms) umhos deg C Rio Inabon basin 50113460 Rio Inabon near Arus, PR Let 18 00 22, long 66 33 13 Hydrologic unit 21010004. At bridge on Hwy 1, 0.9 mi 30.2 4/12/85 0740 6.31 476 22.0 (1.4 km) east of Ponce Mu- (78.2) (0.18) nioipal Airport terminal, and 1.7 mi (2.7 km) west of Arum. Rio Buoana basin 50114600 Rio Bucana at Ponce, PR Let 18 00 28, long 66 35 36 Hydrologic unit 21010004. At bridge on Hwy 1, 0.2 ni (0.3 27.3 4/12/85 1212 37.9 260 24.5 km) east of intersection of (70.7) (1.07) Hwys 1 and 2, 1.5 mi (2.4 km) east of Plaza Degetau in Pon- ce and 3.1 mi (5.0 km) upstream from mouth. Rio Portugues basin 50116500 Rio Portugues at Hwy 2 Let 17 59 52, long 66 36 52 bypass at Ponce, PR Hydrologic unit 21010004. On pier at bridge on Hwy 2 bypass, 1.1 mi (1.8 km) south of Plaza Degetau, and 2.0 mi (3.2 km) upstream from mouth. Rio Matilde basin 20.5 4/12/85 1031 21.3 336 25.0 (53.1) (0.60) 50116970 Rio Canas below Las Americas Avenue, PR Lat 18 00 37, long 66 38 23 Hydrologic unit 21010004. 0.5 mi (0.8 km) upstream 8.39 4/12/85 1132 9.40 680 26.5 from Junction with Rio Pas- (21.73) (0.27) tillo. 50122000 Rio Tallaboa at Tallaboa, PR 50122900 Rio Macana at Magas Arriba, PR Let 17 59 13, long 66 38 22 Hydrologic unit 21010004. 700 ft (213 m) upstream from 6.45 4/12/85 Dry junction with Rio Matilde. (16.71) Rio Tallaboa basin Let 18 00 31, long 66 43 49 Hydrologic unit 21010004.At31.60 4/12/85 1352 8.69 388 32.5 bridge at Hacienda Dolores, (81.6) (0.25) 700 ft (213 m) upstream from Hwy 2, 0.8 mi (1.3 km) north- west of Tallaboa, and 7.6 ai (12.2 km) west of Plaza De- getau in Ponce. Rio Macana basin Lat 18 01 00, long 66 45 57 Hydrologic unit 21010004. 8.96 4/08/85 Dry 1.8 mil (2.8 km) east of Pla- (23.21) za de Guayanilla, 200 ft (60 a) upstream from bridge on Hwy 2, and 0.6 mi (1.0 km) upstream from mouth. Rio Yauco basin 50119200 Quebrada del Agua at Playa de Ponce, PR 50126500 Rio Yauco at Pueblo Sur Lat 18 02 08, long 66 50 61 at Yauco, PR Hydrologic unit 21010004.At bridge on Hwy 2, 0.1 mi (0.2 km) oast of Yauco, and 0.6 mi (1.0 km) upstream from Quebrada Berrenchin. 33.0 4/08/85 Dry (86.6) I I I I I I I I I I I I I I I I I 307 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION STATION NUMBER NAME 50129200 Quebrada Susua at Palomas, PR 50129300 Lajas East Drainage Canal nr Ensenada, PR 50129500 Rio Loco near Guanioa, PR 50130000 Quebrada Boqueron at Boqueron, PR 50132010 Rio Guanajibo below San German, PR 50138900 Rio Yaguez at Balboa, PR 50146070 Rio Grande do Anatico at Anaaco Arriba, PR 50146200 Rio Grande near Rincon, PR LOCATION DRAINAGE AREA AND sq mi BASIN (sq km) Rio L000 basin Lat 18 01 19, long 66 52 28 Hydrologic unit 21010004.At bridge on Hwy 2, 0.5 i (0.8 3.23 km) north of Palomas, and (8.37) 1.9 i (3.1 km) southwest of Yauco. Lat 18 00 40, long 66 58 24 Hydrologic Unit 21010004. On upstream side of Cuesta Blan- ca Bridge on dirt road, 1.1 b i (1.8 Its) north of Hwy 116, 1.0 i (1.6 km) below Quebra- da Jicara, 3.9 i (6.3 km) above Rio Loco and 4.0 i (6.4 km) northwest of Ensena- da. Lat 17 59 38, long 66 54 59 Hydrologic unit 21010004. 90 ft (27 ) upstream from sheet piling drop structu- 21.0 re, 900 ft (274 ) upstream (54.4) fro Lajas Drainage Canal, 7.2 si (11.6 km) downstream fro Lago Loco, and 1.5 si (2.4 km) north of Guanica. Quebrada Boqueron basin Lat 18 01 40, long 67 09 35 Hydrologic unit 21010004.At bridge on Hwy 101 and 0.9 4.35 i (1.4 ka) above mouth. (11.27) Rio Guanajibo basin Let 18 05 28, long 67 02 38 Hydrologic unit 21010003. 0.6 i (0.8 km) north of 36.1 Plaza de San German and (93.5) 1,500 ft (457 m) downstream from bridge on Hwy 360. Rio Yaguez basin Let 18 12 13, long 67 07 55 Hydrologic unit 21010003. 1,200 ft (366 ) upstream 12.2 fro bridge on Balboa St. (31.6) and 1.6 mi (2.6 km) up­ stream fro mouth. Rio Grande de Anaano basin Lat 18 16 21, long 66 08 33 Hydrologic unit 21010003. 0.8 mi (1.2 km) south of 176 Anasco and 3.0 mi (4.8 km) (456) upstream fro mouth. Rio Grande basin Lat 18 22 06, long 67 13 56 Hydrologic unit 21010003. At bridge on Hwy 115, 1.2 mi 2.83 (1.9 km) upstream fro mouth, (7.33) and 2.2 si (3.5 km) northeast of Rincon. DATE TIME STREAM- SPE- TEMPER- FLOW CIFIC CONDUC- ATURE ofs TANCE (cos) limbos deg C 4/08/85 Dry 4/08/85 No Meas 4/08/85 1145 3.50 630 26.5 (0.10) 4/11/85 1230 0.50 - 26.5 (0.014) 4/11/85 1430 10.9 673 30.5 (0.31) 4/11/85 1003 9.08 378 27.0 (0.26) 4/11/85 Too Deep 120 est. (3.40) 4/10/85 1523 0.60 635 25.5 (0.017) I I I I I I I I I I DISCHARGE AT PARTIAL-RECORD STATIONS 308 Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM- SPH- TEMPER- AREA FLOW CIFIC NUMBER NAME AND sq i DATE TIME CONDUC- ATURE cfs TANCE BASIN (sq km) (ems) umhos deg C Rio Ingenio basin 50146400 Rio Ingenio near Lat 18 22 50, long 67 12 34 Aguada, PR Hydrologic unit 21010003. At 6.22 4/10/85 1402 2.17 554 26.5 bridge on unimproved road, (16.11) (0.061) 0.3 i (0.5 km) upstream from confluence with Rio Culebra, 0.7 i (1.1 km) upstream from mouth of Rio Guayabo, and 1.4 i (2.3 km) west of Aguada. Rio Culebra basin 50146600 Rio Culebra near Lat 18 22 26, long 67 11 35 Aguada, PR Hydrologic unit 21010003. At bridge on Hwy 411, 0.6 i 3.70 4/10/85 1438 1.25 463 27.0 (1.0 km) south of Aguada, 1.5 (9.58) (0.035) i (2.4 ka) upstream fro confluence with Rio Ingenio, and 1.9 i (3.1 km) upstream fro mouth of Rio Guayabo. Rio Culebrinas basin 50149100 Rio Culebrinas near Lat 18 24 03, long 67 09 40 Aguada, PR Hydrologic unit 21010003. At bridge on Hwy 2 and 2.3 97.0 4/10/85 1253 230 335 26.0 i (3.7 km) northeast of (251.2) (6.51) Aguada Plaza. a Drainage area does not include coastal undefined drainage. b Indeterminate I I I I 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 ay 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 1985 Annual maximum Station Station name Location Drainage area Period of Date Gage height Dis- charge number sq mi record ft cu ft/a (sq km) (a) (cu /s) Rio Portugues basin 50115900 Rio Portugues at Lat 18 01 09, long 66 36 26, 18.6 1963-85 11/03/84 13.81 6,500 Highway 14 at Ponce, PR on left downstream side of Highway 14 bridge, 1.7 l (48.2) (4.209) (184) (2.7 km) downstream frog Rio Chiquito, and 0.6 i (0.97 ka) northeast of Degetau Plaza in Ponce. 309 Water-Quality at Partial-Record Stations in Puerto Rico 312 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 hydrologic analyses. The data are collected usually less than quarterly. WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 DEPTH OXYGEN, COLI- STREP- ALKA- SOLIDS, AT SPE- DIS- FORM, TOCOCCI LINITY RESIDUE NITRO- SAMPLE CIFIC SOLVED FECAL, FECAL, WATER AT 105 GEN, LOC- CON- P11 OXYGEN, (PER- 0.7 KF AGAR TOTAL DEC. C, NITRATE ATION, DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. FIELD SUS- TOTAL DATE TIME TOTAL ANCE ARD ATURE SOLVED SATUR- (COLS./ PER MG/L AS ('ENDED (MG/I (FEET) (US/CM) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CAC03 (MG/L) AS N) RIO GUAJA'I'ACA BASIN 50010720 LAGO GUAJATACA NO.3 NR MOUTH NR QUEBRADILLAS,PR (LAT 18°22'05" LONG 066'54'36") DEC 1984 19... 0845 1.00 298 8.40 24.5 10.0 123 K13 K4 138 4 MAY 1985 13... 1055 1.00 204 8.10 27.0 7.9 100 K35 42 89 3 JUL 23... 1115 1.00 243 8.20 29.0 8.0 104 K5 93 6 NITRO- BIOMASS CHLOR-A CHLOR-B NITRO- NITRO- NITRO- NITRO- GEN,AM- CHLORO- PIIYTO- PIIYTO- GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- PHOS- PHYLL PLANK- PLANK- NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, RATIO TON TON TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PLANK- CHROMO CHROMO DATE (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (UNITS) (UG/L) (UG/L) 50010720 LAGO GUAJATACA NO.3 NR MOUTH NR QUEBRADILLAS,PR (LAT 18°22'05" LONG 066°54'36") DEC 1984 19... MAY 1985 13... JUL 23... (0.01 <0.01 <0.01 <0.10 <0.10 <0.10 0.01 0.05 <0.01 0.59 0.6 0.45 0.5 0.4 0.01 0.01 <0.01 0.0 0.0 0.01 <0.10 7.40 11.0 <0.10 <0.10 <0.10 DEPTH OXYGEN, COLI- STEEP- HARD- AT SPE- DIS- FORM, TOCOCCI NESS SAMPLE CIFIC SOLVED FECAL, FECAL, HARD- NONCARB CALCIUM LOC- CON- PH OXYGEN, (PER- 0.7 KF AGAR NESS WATER DIS- ATION, DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. (MG/I TOT FLD SOLVED DATE TIME TOTAL ANCE ARD ATURE SOLVED SATUR- (COLS./ PER AS MG/L AS (MG/L (FEET) (US/CM) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CACO3) CACO3 AS CA) 50010790 LAGO GUAJATACA NO.1 NH DAM NH QUEBRADILLAS,PR (LAT 18°23'56" LONG 066°55'23") DEC 1984 19... 1045 1.00 314 8.00 24.5 8.0 98 K4 K3 140 52 19... 1055 82.0 362 7.40 24.0 1.1 13 -- -- 160 14 58 MAY 1985 13... 1225 1.00 176 8.40 28.0 10.0 129 33 58 76 5 25 13... 1250 82.0 312 7.20 0 0 -- 140 4 52 JUL 23... 1215 1.00 242 8.00 28.5 6.6 85 K10 99 7 34 23... 1230 62.3 332 7.10 24.0 0 140 4 51 ALKA- SOLIDS, SOLIDS, MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, SUM OF RESIDUE NITRO- SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, RIDE, DIS- CONSTI- AT 105 GEN, DIS- DIE- SORP- DIS- TOTAL DIS- DIS- DIS- SOLVED TUENTS, DEG. C, NITRATE SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MG/L DIE- SOS- TOTAL DATE (MG/L (MG/L RATIO (MG/L MG/L. AS (MG/L (MG/I (MG/I AS SOLVED VENDED (MG/L AS MG) AS NA) AS K) CAC03 AS SO4) AS CL) AS F) 5IO2) (MG/L) (MG/L) AS N) 50010790 LAGO GUAJA'I'ACA NO.1 NR DAM NR QUEBRAD1LLAS,PR (LAT 18'23'56" LONG 066°55'23") DEC 1984 19... 3.4 5.3 0.2 1.5 161 10 7.6 <0.1 2.7 180 2 19... 3.3 5.2 0.2 1.4 144 9.3 7.0 <0.1 6.4 180 MAY 1985 13... 3.4 5.6 0.3 1.6 71 9.2 8.2 0.1 0.1 96 4 13... 3.6 5.6 0.2 1.8 141 9.6 8.8 0.1 6.5 170 JUL 23... 3.4 5.8 0.3 1.7 92 7.1 8.5 <0.1 0.6 120 4 23... 3.1 4.8 0.2 1.6 136 9.3 7.5 <0.1 5.0 160 K = non-ideal count. ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 313 NITRO- BIOMASS CHLOR-A CHLOR-B NITRO- NITRO- NITRO- NITRO- GEN,AM- CHLORO- PHYTO- PHYTO- GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- PHOS- PHYLL PLANK- PLANK- NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, RATIO TON TON TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PLANK- CHROMO CHROMO DATE (MG/L (MG/I. (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (UNITS) (UG/L) (UG/L) RIO GUAJATACA BASIN-CONTINUED 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56" LONG 066°55'23") DEC 1984 19... <0.01 <0.10 <0.01 19... -- -- - MAY 1985 13... <0.01 <0.10 0.04 13... JUL 23... <0.01 <0.10 0.03 23... 0.5 <0.01 0.0 2.30 <0.10 0.06 0.1 <0.01 0.0 5.40 <0.10 0.37 0.4 <0.01 0.0 4.20 <0.10 DEPTH OXYGEN, COL1- STEEL'- HARD - AT SPE- DIE- FORM, TOCOCCI NESS SAMPLE CIFIC SOLVED FECAL, FECAL, HARD- NONCARB CALCIUM LOC- CON- P11 OXYGEN, (PER- 0.7 KF AGAR NESS WATER DIS- ATION, DUCT- (STAND- TEMPER- DIE- CENT UM-MF (COLS. (MG/I. TOT FLD SOLVED DATE TIME TOTAL ANCE ARD ATURE SOLVED SATUR- (COLS./ PER AS MG/L AS (MG/L (FEET) (US/CM) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CAC03) CAC03 AS CA) RIO GRANDE DE ARECIBO BASIN 50020050 LAGO GARZAS NO.1 NE DAM NR ADJUNTAS,PR (LAT 18'08'21" LONG 066°44'35") DEC 1984 18... 1245 1.00 126 7.30 20.5 6.0 73 94 45 50 14 18... 1255 70.5 125 7.10 20.5 3.8 46 -- -- 50 14 MAY 1985 08... 1245 1.00 150 8.40 24.5 8.6 111 K2 K8 67 19 08... 1300 82.0 146 7.00 20.0 0.4 5 -- 66 19 JUL 19... 0810 1.00 164 7.20 24.0 6.7 84 60 30 59 16 19... 0820 83.0 104 6.50 20.0 0.1 1 34 9.3 ALKA- SOLIDS, SOLIDS, MAGNE- SODIUM I'OTAS- 1.1 NITY CIILO- FLUO- 31L1CA, SUM OF RESIDUE N ITRO- SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, RIDE, 1)18- CONSTI- AT 105 GEN, DIE- DIE- SORP- DIE- TOTAL DIS- DIE- DIS- SOLVED TUENTS, DEG. C, NITRATE SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MG/L DIS- SUS- TOTAL DATE (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L AS SOLVED PENDED (MG/L AS MG) AS NA) AS K) CAC03 AS SO4) AS CL) AS F) SI02) (MG/L) (MG/L) AS N) DEC 1984 50020050 LAGO GARZAS NO.1 NH DAM NR ADJUNTAS,PR (LAT 18°08'21" LONG 066.44'35") 18... 3.6 5.4 0.3 1.1 53 3.6 5.0 <0.1 15 79 2 18... 3.6 5.5 0.4 1.1 54 3.6 5.1 <0.1 16 81 MAY 1985 08... 4.8 6.4 0.4 1.0 69 3.6 6.1 <0.1 18 100 6 08... 4.4 5.9 0.3 1.1 74 3.4 5.7 <0.1 19 100 JUL 19... 4.7 6.4 0.4 1.0 64 3.8 6.0 <0.1 9.1 85 9 19... 2.6 3.8 0.3 1.2 38 4.3 4.4 <0.1 11 59 NITRO- BIOMASS CHLOR-A CHLOR-B NITRO- NITRO- NITRO- NITRO- GEN,AM- CHLORO- PHYTO- PHYTO- GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- P1103- PHYLL PLANK- PLANK- NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, RATIO TON TON TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PLANK- CHROMO CHROMO DATE (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/1. TON FLUOROM FLUOROM AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (UNITS) (UG/L) (UG/L) 5002(1050 LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PU (LAT 18°08'21" LONG 066°44'35") DEC 1984 18... <0.01 0.30 <0.01 0.5 0.8 3.5 <0.01 0.0 1.10 <0.10 18... - MAY 1985 08... <0.01 <0.10 0.04 0.36 0.4 <0.01 0.0 3.00 <0.10 08... -- JUL 19... <0.01 <0.10 <0.01 0.3 <0.01 0.0 9.50 <0.10 19... K = non-ideal count 314 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 DEPTH OXYGEN, COLI- STREP- ALKA- SOLIDS, AT SPE- DIE- FORM, TOCOCCI LINITY RESIDUE NITRO- SAMPLE CIFIC SOLVED FECAL, FECAL, WATER AT 105 GEN, LOC- CON- PH OXYGEN, (PER- 0.7 KF AGAR TOTAL DEG. C, NITRATE ATION, DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. FIELD SUS- TOTAL DATE TIME TOTAL ANCE ARD ATURE SOLVED SATUR- (COLS./ PER MG/L AS PENDED (MG/L (FEET) (US/CM) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CAC03 (MG/L) AS N) RIO GRANDE DE ARECIBO BASIN--CONTINUED 50025110 LAGO DOS BOCAS NO.3 AT WEST BRANCH NR UTUADO,PR (LAT 18.19'16" LONG 066°40'11") DEC 1984 12... 1035 1.00 211 7.90 26.0 8.6 107 120 Kll 73 2 0.58 MAY 1985 09... 0915 1.00 227 8.30 27.0 8.0 100 >600 K4 78 4 JUL 18... 1155 1.00 235 7.40 28.0 5.7 72 65 K15 77 4 NITRO- BIOMASS CHLOR-A CHLOR-B NITRO- NITRO- NITRO- NITRO- GEN,AM- CHLORO- PHYTO- PIIYTO- GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- PHOS- PHYLL PLANK- PLANK- NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, RATIO TON TON TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PLANK- CHROMO CHROMO DATE (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (UNITS) (UG/L) (UG/L) 50025110 LAGO DOS BOCAS NO.3 AT WEST BRANCH NR UTUADO,PR (LAT 18"19'15" LONG 066°40'11") DEC 1984 12... 0.02 0.60 <0.01 0.5 1.1 4.9 <0.01 <0.10 <0.10 MAY 1985 09... 0.01 <0.10 <0.01 0.4 0.02 0.0 10.0 <0.10 JUL 18... <0.01 0.20 <0.01 0.6 0.8 3.5 <0.01 0.0 8.20 <0.10 DEPTH OXYGEN, COLI- STREP- HARD- AT SPE- DIE- FORM, TOCOCCI NESS SAMPLE CIFIC SOLVED FECAL, FECAL, HARD- NONCARB CALCIUM LOC- CON- PH OXYGEN, (PER- 0.7 KF AGAR NESS WATER D1S- ATION, DUCT- (STAND- TEMPER- DIE- CENT UM-MF (COLS. (MG/1. TOT FI.D SOLVED DATE TIME TOTAL ANCE ARD ATURE SOLVED SATUR- (COLS./ PER AS MG/L AS (MG/1. (FEET) (US/CM) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CACO3) CACO3 AS CA) 50027090 LAGO DOS BOCAS NO.1 NH DAM Nit UTUADO,PR (LAT 18°20'09" LONG 066°40'04") DEC 1984 12... 1145 1.00 204 8.00 26.0 8.4 104 22 K2 75 4 20 12... 1150 88.6 177 7.40 23.5 3.9 46 -- 78 3 21 MAY 1985 09... 1025 1.00 208 8.20 28.0 7.2 91 83 6 23 09... 1050 85.3 184 6.80 23.5 0.8 9 86 14 24 JUL 18... 1250 1.00 230 7.20 28.5 5.6 72 24 40 79 4 21 18... 1300 82.0 189 6.80 24.5 0.5 6 61 16 ALKA- SOLIDS, SOLIDS, MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, SUM OF RESIDUE NITRO- SIUM, SODIUM, AD- SHIM, WATER SULFATE RIDE, R11)E, DIS- CONSTI- AT 105 GEN, DIE- DIE- SORP- 1)15- TOTAL D1S- DIE- DIE- SOLVED TUENTS, DEG. C, NITRATE SOLVED SOLVED T1ON SOLVED FIELD SOLVED SOLVED SOLVED (MG/L DIS- SUS- TOTAL DATE (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L AS SOLVED PENDED (MG/L AS MG) AS NA) AS K) CACO3 AS 504) AS CL) AS F) 5102) (MG/L) (MG/L) AS N) 50027090 LAGO DOS BOCAS NO.1 NH DAM NH UTUADO,PR (LAT 18°20'09" LONG 066°40'04") DEC 1984 12... 6.0 10 0.5 1.7 71 15 10 <0.1 21 130 <1 0.49 12... 6.2 10 0.5 1.9 75 11 14 0.1 24 130 MAY 1985 09... 6.2 10 0.5 1.6 77 11 9.5 <0.1 17 120 16 09... 6.4 11 0.5 1.6 72 15 11 <0.1 18 130 JUL 18... 6.4 10 0.5 2.2 75 14 11 0.2 19 130 8 18... 5.1 7.7 0.4 2.1 61 13 8.3 0.1 16 100 K = non-ideal count 315 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 NITRO- BIOMASS CHLOR-A CHLOR-B NITRO- NITRO- NITRO- NITRO- GEN,AM- CHLORO- PIIYTO- PHYTO- GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- PHOS- PHYLL ['LANK- PLANK- NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, RATIO TON TON TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PLANK- CIIROMO CHROMO DATE (MG/L (MU/I. (MU/I. (MG/1. (MU/1. (MG/1. (MG/L (MG/L TON FLUOROM FLUOROM AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS 1') (UNITS) (UG/L) (UG/L) RIO GRANDE DE ARECIBO BASIN--CONTINUED 50027090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18°20'09" LONG 066°40'04") DEC 1984 12... 0.01 0.50 <0.01 0.9 1.4 6.2 <0.01 0.0 <0.10 <0.10 12... -- MAY 1985 09... <0.01 <0.10 <0.01 0.3 <0.01 0.0 6.60 (0.10 09... JUL 18... (0.01 0.30 0.07 0.53 0.6 0.9 4.0 <0.01 0.0 4.30 <0.10 18... DEPTH OXYGEN, COLT- STREP- ALKA- SOLIDS, AT SPE- DIS- FORM, TOCOCCI I.INITY RESIDUE NITRO- SAMPLE CIFIC SOLVED FECAL, FECAL, WATER AT 105 GEN, LOC- CON- PH OXYGEN, (PER- 0.7 KF AGAR TOTAL DEG. C, NITRATE ATION, DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. FIELD SUS- TOTAL. DATE TIME TOTAL ANCE ARD ATURK SOLVED SATUR- (COLS./ PER MG/L AS PENDED (MG/L (FEET) (US/CM) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CAC03 (MG/L) AS N) R10 DE LA PLATA BASIN 50039900 LAGO CARITE NO.3 ON RIO DE LA PLATA NR CAYEY,PR (LAT 18°05'04" LONG 066°06'03") DEC 1984 13... 1155 1.00 80 7.20 23.5 9.4 118 25 3 MAY 1985 07... 1340 1.00 94 7.60 25.5 12.7 164 K4 K12 33 2 JUL 17... 1145 1.00 96 7.20 26.5 6.9 90 30 3 NITRO- BIOMASS CIILOR-A CHLOR-B NITRO- NITRO- NITRO- NITRO- GEN,AM- CHLORO- PHYTO- PHYTO- GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- PROS- PHYLL PLANK- PLANK- NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, RATIO TON TON TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PLANK- CHROMO CIIROMO DATE (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (UNITS) (UG/L) (UG/L) 50039900 LAGO CARITE NO.3 ON RIO DE LA PLATA NH CAYEY,PR (LAT 18.05'04" LONG 066.06'03") DEC 1984 13... <0.01 0.20 0.01 1.1 1.1 1.3 5.8 0.13 0.0 3.90 <0.10 MAY 1985 07... <0.01 0.20 0.11 0.1 0.3 1.3 <0.01 0.0 3.20 <0.10 JUL 17... <0.01 <0.10 <0.01 0.3 <0.01 0.0 10.0 <0.10 DEPTH OXYGEN, COL 1- STREP- HARD- AT SPE- DIS- FORM, TOCOCCI NESS SAMPLE CIFIC SOLVED FECAL, FECAL, HARD- NONCARB CALCIUM LOC- CON- PH OXYGEN, (PER- 0.7 KF AGAR NESS WATER D1S­ ATION, DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. (MG/L TOT FLD SOLVED DATE TIME TOTAL ANCE AHD ATTIRE SOLVED SATUR- (COLS./ PER AS MG/L AS (MG/L (FEET) (US/CM) UNITS) (DEG C) (MG/l.) ATION) 100 ML) 100 ML) CACO3) CACO3 AS CA) 50039950 LAGO CARITE NO.1 NH DAM NH CAYEY.PR (LAT 18°04'39" LONG 066°06'19") DEC 1984 13... 1105 1.00 78 7.20 22.5 10.3 127 20 K4 21 4.2 13... 1115 55.8 79 6.70 21.5 3.6 -- -- 21 4.1 MAY 1985 07... 1210 1.00 92 7.60 25.5 31 6.4 07... 1220 65.6 88 7.60 21.5 31 6.4 JUL 17... 1040 1.00 90 7.20 26.5 6.8 88 29 25 28 5.4 17... 1055 67.2 88 6.40 21.5 0.4 21 4.3 K = non-ideal count 316 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 ALKA- SOLIDS, SOLIDS, MAUNE- SODIUM POTAS- LINITY CULO- FLUO- SILICA, SUM OF RESIDUE NITRO- SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, RIDE, DIS- CONSTI- AT 105 GEN, DIS- DIS- SORP- DIS- TOTAL DIS- DIS- DIS- SOLVED TUENTS, DEG. C, NITRATE SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MU/L DIS- SUS- TOTAL DATE (MG/L (MG/I. RATIO (MU/L MU/L AS (MU/L (MG/L (MG/L AS SOLVED PENDED (MG/L AS MG) AS NA) AS K) CAC03 AS 804) AS CL) AS F) 5IO2) (MG/L) (MG/L) AS N) RIO DE LA PLATA BASIN--CONTINUED 50039950 LAGO CARITE NO.1 NR DAM NH CAYEY.PR (LAT 18004'39" LONG 066°06'19") DEC 1984 13... 2.6 6.7 0.6 0.6 25 2.9 7.9 <0.1 13 53 2 13... 2.7 6.8 0.7 24 3.6 8.1 <0.1 15 -- MAY 1985 07... 3.6 8.4 0.7 0.7 31 3.2 8.4 <0.1 15 65 I 07... 3.7 8.4 0.7 <0.1 33 3.2 8.5 <0.1 16 -- JUL 17... 3.5 7.7 0.7 0.8 30 3.6 8.5 <0.1 16 63 3 17... 2.6 4.9 0.5 0.8 34 3.5 6.1 <0.1 9.2 52 NITRO- BIOMASS CHLOR-A CHLOR-B NITRO- NITRO- NITRO- NITRO- GEN,AM- CHLORO- PHYTO- PHYTO- GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- PHOS- PIIYLL PLANK- PLANK- NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, RATIO TON TON TOTAL TOTAL. TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PLANK- CHROMO CIIROMO DATE (MG/I. (MG/I. (MG/I. (MG/l. (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (UNITS) (UG/L) (UG/L) 50039950 LAGO CARITE NO.1 NR DAM NH CAYEY.PR (I.AT 18004'39" LONG 066.06'19") DEC 1984 13... <0.01 0.10 <0.01 0.5 0.6 2.7 0.02 0.80 <0.10 13... MAY 1985 07... <0.01 <0.10 0.01 0.29 0.3 <0.01 0.0 1.60 <0.10 07... JUL 17... <0.01 <0.10 <0.01 0.3 <0.01 0.0 7.10 <0.10 17... DEPTH OXYGEN, COLE- S'I'RE!'- ALKA- SOLIDS, AT SPE- DIS- FORM, 'I'OCOCCI LINITY RESIDUE NITRO- SAMPLE CIFIC SOLVED FECAL, FECAL, WATER AT 105 GEN, LOC- CON- PH OXYGEN, (PER- 0.7 KF AGAR TOTAL DEG. C, NITRATE ATION, DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. FIELD SUS- TOTAL DATE TIME TOTAL ANCE ARD ATURE SOLVED SATUR- (COLS./ PER MG/L AS PENDED (MG/L (FEET) (US/CM) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CAC03 (MG/L) AS N) 50044400 LAGO LA PLATA NO.5 NH MOUTH NE NARANJITO, PR (LAT 18°19'33" LONG 066°12'28") DEC 1984 10... 1135 1.00 341 8.50 26.0 11.2 139 1600 57 128 9 0.87 MAY 1985 06... 1600 1.00 339 8.00 28.0 10.4 132 50 K110 121 6 JUL 15... 1740 1.00 394 7.40 28.5 4.9 63 39 170 146 6 NITRO- BIOMASS CHLOR-A CHLOR-B NITRO- NITRO- NITRO- NITRO- GEN,AM- CHLORO- PHYTO- PHYTO- GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- PROS- PIIYLL PLANK- PLANK- NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, RATIO TON TON TOTAL. TOTAL TOTAL TOTAL TOTAL. TOTAL TOTAL TOTAL PLANK- CIIROMO CHROMO DATE (MG/I. (MG/L (MG/I. (MG/1. (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (UNITS) (UG/L) (UG/L) 50044400 LAGO LA PLATA NO.5 NR MOUTH NR NARANJITO, PR (LAT 18°19'33" LONG 066°12'28") DEC 1984 10... 0.03 0.90 0.01 0.49 0.5 1.4 6.2 0.12 0.0 4.40 <0.10 MAY 1985 06... <0.01 <0.10 0.05 0.65 0.7 0.23 0.0 9.40 <0.10 JUL 15... <0.01 <0.10 <0.01 0.4 0.04 0.0 7.60 <0.10 K = non-ideal count ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS 317 WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 DEPTH OXYGEN, COLI- STREP- HARD- AT SPE- DIS- FORM, TOCOCCI NESS SAMPLE CIFIC SOLVED FECAL, FECAL, HARD- NONCARH CALCIUM LOC- CON- PH OXYGEN, (PER- 0.7 KF AGAR NESS WATER DIS- ATION, DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. (MG/L TOT FLD SOLVED DATE TIME TOTAL ANCE ARD ATURE SOLVED SATUR- (COLS./ PER AS MG/L AS (MG/L (FEET) (US/CM) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CAC03) CAC03 AS CA) RIO DE LA PLATA BASIN--CONTINUED 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18" LONG 066.14'01") DEC 1984 10... 1310 1.00 312 8.60 26.5 12.6 158 45 K2 120 2 29 10... 1320 77.1 285 7.50 23.6 1.3 -- 110 0 26 MAY 1985 06... 1320 1.00 322 8.40 28.0 12.8 162 K11 K6 120 4 30 06... 1340 60.? 200 6.80 22.5 0.1 -- 72 8 18 JUL 15... 1600 1.00 351 7.40 29.0 5.2 67 K3 22 130 3 32 15... 1615 82.0 121 6.40 22.5 0.4 -- -- 44 11 ALKA- SOLIDS, SOLIDS, MAGEE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, SUM OF RESIDUE NITRO- SIUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, RIDE, DIS- CONSTI- AT 105 GEN, DIS- DIS- SORP- DIS- TOTAL DIS- DIE- DIE- SOLVED TUENTS, DEG. C, NITRATE SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MG/L DIS- SUS- TOTAL DATE (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L AS SOLVED PENDED (MG/L AS MG) AS NA) AS K) CAC03 AS SO4) AS CL) AS F) SI02) (MG/L) (MG/L) AS N) DEC 1984 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18" LONG 066014'01") 10... 11 18 0.7 2.1 116 16 19 <0.1 17 180 3 0.18 10... 10 13 0.6 2.2 106 13 16 <0.1 20 160 MAY 1985 06... 12 19 0.8 2.4 120 17 22 0.1 19 190 <1 06... 6.6 13 0.7 2.8 64 12 15 0.1 15 120 JUL 15... 13 19 0.7 2.5 130 19 24 0.1 5.3 190 3 15... 3.9 7.0 0.6 1.9 47 7.7 7.0 <0.1 7.9 75 NITRO- BIOMASS CHLOR-A CHLOR-B NITRO- NITRO- NITRO- NITRO- GEN,AM- CHLORO- PHYTO- PHYTO- GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- PHOS- PHYLL PLANK- PLANK- NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, RATIO TON TON TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PLANK- CHROMO CHROMO DATE (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (UNITS) (UG/L) (UG/L) 50044950 LAGO LA PLATA NO.3 NH DAM NH NARANJITO, PR (LAT 18°20'18" LONG 066014'01") DEC 1984 10... 0.02 0.20 0.02 10... -- -- - MAY 1985 06... <0.01 <0.10 0.04 06... JUL 15... <0.01 <0.10 <0.01 15... 0.38 0.4 0.6 2.7 0.03 0.0 12.0 <0.10 0.76 0.8 0.07 0.0 30.0 <0.10 0.3 <0.01 0.0 9.00 <0.10 DEPTH OXYGEN, COLT- STREP- ALKA- SOLIDS, AT SPE- DIS- FORM, TOCOCCI LINITY RESIDUE NITRO- SAMPLE CIFIC SOLVED FECAL, FECAL, WATER AT 105 GEN, LOC- CON- PH OXYGEN, (PER- 0.7 KF AGAR TOTAL DEG. C, NITRATE ATION, DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. FIELD SUS- TOTAL DATE TIME TOTAL ANCE ARD ATURE SOLVED SATUR- (COLS./ PER MG/L AS ',ENDED (MG/L (FEET) (US/CM) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CAC03 (MG/L) AS N) RIO GRANDE DE LOIZA BASIN DEC 1984 50057500 LAGO LOIZA NO.4 NR MOUTH NR CAGUAS, PR (LAT 18016'51" LONG 066.00'35") 11... 0915 1.00 292 7.90 25.5 10.9 134 290 26 93 6 0.54 MAY 1985 10... 1215 1.00 284 7.20 28.0 5.9 76 K78 90 9 0.15 JUL 16... 1150 1.00 332 7.10 27.5 4.0 50 40000 27000 92 104 0.29 K = non-ideal count 318 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 NITRO- BIOMASS CHLOR-A CHLOR-B NITRO- NITRO- NITRO- NITRO- GEN,AM- CHLORO- PHYTO- PHYTO- GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- PHOS- PHYLL PLANK- PLANK- NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, RATIO TON TON TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PLANK- CHROMO CHROMO DATE (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (UNITS) (UG/L) (UG/L) RIO GRANDE DE LOIZA BASIN--CONTINUED 50057500 LAGO LOIZA NO.4 NE MOUTH NR CAGUAS, PR (LAT 18°16'51" LONG 066°00'35") DEC 1984 11... MAY 1985 10... JUL 16... 0.06 0.05 0.11 0.60 0.20 0.40 0.22 0.71 0.44 0.58 0.49 0.86 0.8 1.2 1.3 1.4 1.4 1.7 6.2 6.2 7.5 0.0 0.34 0.0 0.29 0.0 12.0 19.0 14.0 <0.10 <0.10 <0.10 DEPTH OXYGEN, COLI- STREP- HARD- AT SPE- DIS- FORM, TOCOCCI NESS SAMPLE CIFIC SOLVED FECAL, FECAL, HARD- NONCARB CALCIUM LOC- CON- PH OXYGEN, (PER- 0.7 KF AGAR NESS WATER DIS- ATION, DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. (MO/L TOT FLD SOLVED DATE TIME TOTAL ANCE ARD ATURE SOLVED SATUR- (COLS./ PER AS MG/L AS (MG/L (FEET) (US/CM) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CAC03) CAC03 AS CA) 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29" LONG 066°00'47") DEC 1984 11... 1040 1.00 282 8.30 26.5 11.7 145 K19 K4 91 22 11... 1045 37.0 309 7.40 25.0 1.8 -- -- 94 23 MAY 1985 10... 1020 1.00 228 7.20 27.5 7.9 99 K9 Kll 72 1 18 10... 1045 42.6 173 6.40 24.0 0.3 -- -- 52 13 JUL 16... 1055 1.00 303 6.80 29.0 2.6 33 110 74 85 19 16... 1105 34.4 320 6.70 -- 0.1 -- -- 92 22 ALKA- SOLIDS, SOLIDS, MAGPIE- SODIUM POTAS- LINITY CULO- FLUO- SILICA, SUM OF RESIDUE NITRO- SIUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, RIDE, DIS- CONSTI- AT 106 GEN, DIS- DIS- SORP- DIS- TOTAL DIS- DIS- DIS- SOLVED TUENTS, DEG. C, NITRATE SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MG/L DIS- SUS- TOTAL DATE (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L AS SOLVED PENDED (MG/L AS MG) AS NA) AS K) CAC03 AS SO4) AS CL) AS F) SI02) (MG/L) (MG/L) AS N) DEC 1984 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29" LONG 066000'47") 11... 8.7 22 1 2.2 93 18 17 0.2 26 170 40 0.16 11... 8.8 23 1 2.4 99 18 28 0.1 30 190 MAY 1985 10... 6.6 18 1 2.1 71 17 16 0.1 23 140 6 10... 4.8 12 0.7 2.8 57 9.4 12 <0.1 16 100 JUL 16... 9.1 24 1 3.1 87 23 25 0.2 16 170 10 16... 9.1 20 0.9 3.2 106 14 21 0.2 20 170 -- NITRO- BIOMASS CHLOR-A CHLOR-B NITRO- NITRO- NITRO- NITRO- GEN,AM- CHLORO- PHYTO- PHYTO- GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- PROS- PHYLL PLANK- PLANK- NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, RATIO TON TON TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PLANK- CHROMO CHROMO DATE (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (UNITS) (UG/L) (UG/L) 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18019'29" LONG 066°00'47") DEC 1984 11... 0.04 0.20 0.03 0.77 0.8 1.0 4.4 0.09 0.0 14.0 <0.10 11... MAY 1985 10... 0.03 <0.10 <0.01 0.7 0.10 5.00 20.0 <0.10 10... JUL 16... 0.04 <0.10 0.10 0.8 0.9 0.16 0.0 14.0 <0.10 16... K = non-ideal count ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS 319 WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN SULFAN, DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UO/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) RIO GUAJATACA BASIN 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56" LONG 066°55'23") JUL 1985 23... 1215 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 <0.01 <0.01 <0.10 RIO GRANDE DE ARECIBO BASIN 50020050 LAGO GARZAS NO.1 NR DAM NH ADJUNTAS,PR (LAT 18J08'21" LONG 066°44'35") JUL 1985 19... 0810 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 <0.01 <0.01 <0.10 50027090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18°20'09" LONG 066°40'04") JUL 1985 18... 1250 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 RIO DE LA PLATA BASIN 50039950 LAGO CARITH NO.1 NH DAM NH CAYRY.PR (LAT 18.04'39" LONG 066.06'19") JUL 1985 17... 1040 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18" LONG 066°14'01") JUL 1985 15... 1600 RIO GRANDE DE LOIZA BASIN 50058800 LAGO LO1ZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29" LONG 066°00'47") JUL 1985 16... 1055 <0.1 <0.1 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 NAPH- THA- PARA- POLY- PER- TOX- TOTAL TRION, CHLOR. THANE APHENE, TRI- 2,4-D, 2,4,5-T 2, 4-DP SILVEX, DATE TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) RIO GUAJATACA BASIN--CONTINUED 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56" LONG 066'55'23") MAY 1985 23... <0.01 <0.1 <0.1 <1 <0.01 0.08 <0.01 <0.01 <0.01 RIO GRANDE DE ARECIBO BASIN--CONTINUED 320 50020050 JUL 1985 18... 50027090 JUL 1985 18... 50039950 JUL 1985 17... 50044950 JUL 1985 15... 50058800 JUL 1985 16... LAGO GARZAS NO.1 NR DAM NH ADJUNTAS,PR (LAT 18°08'21" LONG 066°44'35") RIO DE LA PLATA BASIN--CONTINUED LAGO CARITE NO.1 NR DAM NH CAYEY.PR (LAT 18°04'39" LONG 066°06'19") LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18" LONG 066°14'01") <0.01 <0.01 <0.01 <0.01 RIO GRANDE DE LOIZA BASIN--CONTINUED LAGO LOIZA NO.7 NR DAM NH TRUJILLO ALTO, PR (LAT 18°19'29" LONG 066°00'47") <0.01 <0.1 <0.1 <1 <0.01 0.03 <0.01 <0.01 <0.01 <0.01 <0.1 <0.1 <1 <0.01 <0.01 <0.01 <0.01 <0.01 LAGO DOS BOCAS NO.1 NR DAM NH UTUADO,PI1 (LAT 18°20'09" LONG 066°40'04") <0.01 <0.1 <0.1 <1 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.1 <0.1 <t <0.01 <0.01 <0.01 <0.01 <0.01 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS 321 WATER-QUALITY DAA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) RIO GUAJATACA BASIN--CONTINUED 50010790 LAGO GUAJATACA NO.1 NR DAM NR QURBRADILLAS,PR (LAT 18°23'56" LONG 066°55'23") MAY 1985 23... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 (0.01 RIO GRANDE DE ARECIBO BASIN--CONTINUED 50020050 JUL 1985 18... (0.01 50027090 JUL 1985 18... <0.01 LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18°08'21" LONG 066°44'35") LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18°20'09" LONG 066°40'04") <0.01 <0.01 (0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0 . 01 (0.01 <0.01 RIO DE LA PLATA BASIN--CONTINUED 50039950 LAGO CARITE NO.1 NR DAM NR CAYRY.PR (LAT 18.04'39" LONG 066.06'19") JUL 1985 17... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 50044950 LAGO LA PLATA NO.3 NE DAM NE NARANJITO, PR (LAT 18Q20'18" LONG 066°14'01") JUL 1985 15... R10 GRANDE DE LOIZA BASIN--CONTINUED 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29" LONG 066.00'47") JUL 1985 16... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 Ground-Water Records for Puerto Rico I I I I I I I I I I I I I I I I I I I 324 GROUND-WATER LEVELS RIO OUAJATACA BASIN 182538067015900. Local number, 164. LOCATION.--Lat 18°26'38", long 67°01'59". Owner: P.R. Aqueduct and Sewer Authority. Name: Rocha Moca. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 12 in (0.30 a), cased 0-100 ft (0-30.49 ), perforated 100-160 ft (30.49-48.78 a), diameter 10 in (0.26 ), cased 0-140 ft (0-42.68 ), perforated 140-200 ft (42.68-61.0 a), gravel packed 120-200 ft (36.58-61.0 ). Depth 200 ft (61.0 ). DATUM.--Elevation of land-surface datum is about 787 ft (240 ) above mean sea level, fro topographic map. Measuring point: Upper edge of 1.5 in (0.04 ) pipe on pump base, 1.40 ft (0.43 ) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--January 18, 1982 to March 4, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 144.7 ft (44.12 ) below land-surface datum, Nov. 3, 1983; lowest water level measured, 176.1 ft (59.69 ) below land-surface datum, Feb. 18, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 5 a147.6 Dec. 20 a148.8 Feb. 20 a148.5 Mar. 4 a148.6 Nov. 15 a147.9 Jan. 16 a155.7 182421067015000. Local number, 165. LOCATION.--Lat 18024'21", long 67°01'50". Owner: P.R. Aqueduct and Sewer Authority. Name: Mateo Peres - Bo. Salton. AQUIFER.--Cibao Formation, Guajataoa member. WELL CHARACTERISTICS.--Drilled production water-table well, diameter 16 in (0.40 a), cased 16 in (0.40 m) 0-40 ft (0-12.2 ), cased 12 in (0.30 ) 40-200 ft (12.2-61.0 ). Depth 200 ft (61.0 ). DATUM.--Elevation of land-surface datum is about 672 ft (205 ) above mean sea level, fro topographic sap. Measuring point: Hole on top of pump base, 1.00 ft (0.30 ) above land-surface datum. REMARKS.--Pumping discontinued. Abandoned observation well. PERIOD OF RECORD.--January 1982 to March 4, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 67.89 ft (20.69 below land-surface datum, Jan. 16, 1985; lowest water level measured, 70.60 ft (21.52 ) below land-surface datum, June 18, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 5 69.08 Dec. 20 68.88 Feb. 20 68.55 Mar. 4 68.32 Nov. 16 68.99 Jan. 16 67.89 a Pumping. I I I I I I I I I I I I I I I I I I I 325 GROUND-WATER LEVELS RIO GRANDE DE ARECIBO BASIN 181041066441100. Local number, 86. LOCATION.--Lat 18°10'41", long 660 44'11". Owner: Joaquin Mattel - U.S. Geological Survey. Name: Adjuntas. AQUIFER.--Alluvium of Quaternary Age and volcanic rook of Eocene Age. WILL CHARACTERISTICS.--Drilled test well, diameter 6 in (0.15 ). Depth 300 ft (91.4 a). DATUM.--Elevation of land-surface datum is about 1,460 ft (445 ) above mean sea level, from topographic map. Measuring point: Bottom edge of hole in 6 in (0.15 a) casing, 1.45 ft (0.44 ) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--August 1967 to January 14, 1986, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 4.94 ft (1.92 ) below land-surface datum, Jan. 12, 1979; lowest water level measured, 12.60 ft (3.84 ) below land-surface datum, May 2, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 3 9.37 Nov. 14 8.78 Jan. 14 12.37 181307066355000. Local number, 129. LOCATION.--Lat 18 13'07", long 66 95'50". Owner: P.R. Aqueduot and Sewer Authority. Name: Jayuya 3. AQUIFER.--Recent alluvium. WELL CHARACTERISTICS.--Drilled for public supply well, diameter 10 in (0.25 ), cased 0-27 ft (0-8.23 a), perforated 27-100 ft (8.29-30.48 ), gravel packed 0-100 ft (0-90.48 ). Depth 100 ft (30.48 ). DATUM.--Elevation of land-surfaoe datum i about 1,400 ft (427 a) above mean ea level, from topographic nap. Measuring point: Lower edge of 0.75 in (0.02 ) pipe on concrete pump base, 1.40 ft (0.43 ) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--Jan. 16, 1976 to July 21, 1977, Jan. 15, 1980 to December 8, 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 10.73 ft (3.27 ) below land-surface datum, May 30, 1980; lowest water level measured, a49.36 ft (a15.04 ) below land-surface datum, Apr. 21, 1976. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Date level Date level Oct. 26 13.14 Dec. 8 14.59 182630066384900. Local number, 161. LOCATION.--Let 18026'30", long 660 98'49". Owner: P.R. Aqueduct and Sewer Authority. Name: Santana #2 AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 12 in (0.30 a), cased 0-180 ft (0-64.88 a), diameter 10 in (0.25 ), perforated 175-220 ft (53.35-67.07 ). Depth 220 ft (67.07 ). DATUM.--Elevation of land-surface datum is about 148 ft (45.1 a) above mean sea level, from topographic map. Measuring point: Airhole in pump base, 0.90 ft (0.27 a) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.--January 8, 1982 to March 5, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level seasured, a113.7 ft (a34.66 a) below land-surface datum, Jan. 8 1982; lowest water level measured, a152.2 ft (a46.40 ) below land-surface datum, May 12, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 9 a132.4 Dec. 4 a132.5 Jan. 15 a132.6 Mar. 5 a134.0 a Pumping. I I I I I I I I I I I I I I I I I I I I 326 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182548066300200. Local number, 68. LOCATION.--Lat 18°25'48", long 66°30'02". Owner: P.R. Aqueduct and Sewer Authority. Name: Manati 2. AQUIFER.--Unconsolidated deposits of Quaternary Age and limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 20 to 12 in (0.61 to 0.30 ), cased 20 in (0.51 ) 8-168 ft (2.44-51.21 ); 12 in (0.30 ) 153-206 ft (46.65-62.80 ); perforated 20 In (0.51 ) 80-168 ft (24.39-51.21 ), 12 in (0.30 ), 153-206 ft (46.65-62.80 ). Depth 212 ft (64.6 ). DATUM.--Elevation of land-surface datum is about 31.4 ft (9.57 ) above mean sea level, from topographic map. Measuring point: Bottom edge of hole in 20 in (0.51 ) casing, 3.55 ft (1.08 a) above land-surface datum. REMARKS.--Observation well. Lowest and highest water levels are pumping levels. PERIOD OF RECORD.--October 1960 to December 7, 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, a22.50 ft (a6.86 ) below land-surface datum, June 2, 1965; lowest water level measured, a37.19 ft (a11.34 a) below land-surface datum, Jan. 15, 1975. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 15 a26.80 Nov. 1 a28.77 Deo. 7 a28.85 182603066333600. Local number, 71. LOCATION.--Lat 18.26'03", long 66°33'36". Owner: P.R. Aqueduct and Sewer Authority. Name: Florida Afuera, Barceloneta. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 12 in (30 cm), cased 0-150 ft (0-45.73 m). Depth 235 ft (71.64 ). DATUM.--Elevation of land-surface datum is about 213 ft (64.9 ) above mean sea level, fro topographic map. Measuring point: Lower edge of 0.75 in (0.02 ) pipe in pump base, 3.0 ft (0.91 ) above land surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--March 1960 to March 5, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, a15.67 ft (a4.78 ) below land-surface datum, Dec. 4, 1984; lowest water level measured, 226.9 ft (69.17 ) below land-surface datum, Apr. 4, 1963. , WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 15 a16.37 Dec. 4 a15.67 Jan. 15 a17.37 Mar. 5 a17.74 Nov. 2 a16.82 a Pumping. I I I I I I I 327 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182621066343300. Local number, 135. LOCATION.--Lat 18°26'21", long 66°34'33". Owner: Puerto Rico Land Authority. Name: Lederle. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled agricultural water-table well, diameter 24 in (0.81 ), cased 0-30 ft (0-9.1 ), diameter 16.62 in (0.42 a), cased to 0-450 ft (0-137.2 ). Depth 550 ft (167.6 ). DATUM.--Elevation of land-surface datum is 287 ft (87.48 ) above mean sea level, fro topographic map. Measuring point: Top of shelter floor, 2.8 ft (0.85 ) 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 a) below land-surface datum, Dec. 16, 1981; lowest water level recorded, 283.9 ft (86.55 a) below land-surface datum, May 3, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 283.55 283.27 283.55 283.61 283.74 283.72 283.66 283.55 283.34 283.56 283.46 283.32 2 283.56 283.25 283.55 283.60 283.77 283.72 283.65 283.55 283.36 283.59 283.46 283.32 3 283.57 283.26 283.54 283.60 283.80 289.71 283.63 283.55 283.39 283.60 283.46 283.33 4 289.55 283.21 283.64 283.62 283.81 283.61 283.51 283.55 283.41 283.61 289.45 283.32 5 283.55 283.15 283.54 289.62 283.83 283.60 283.46 283.56 283.44 283.61 283.42 283.33 6 283.44 283.14 283.56 283.61 283.84 283.60 283.45 283.58 283.45 283.61 283.39 283.34 7 283.39 289.12 283.56 283.69 283.81 283.58 283.45 283.58 283.47 283.60 283.39 283.35 8 289.33 283.11 283.58 283.71 283.78 283.58 283.46 283.58 283.50 283.56 283.40 283.35 9 283.31 283.12 283.58 283.72 283.72 283.59 283.48 283.59 283.52 283.54 283.40 283.35 10 289.31 283.20 283.58 283.72 283.70 283.57 283.51 283.60 283.54 283.53 283.39 283.34 11 283.95 283.28 283.56 283.71 283.60 283.56 283.53 283.60 283.56 283.53 283.38 283.33 12 283.41 283.34 289.56 283.68 289.59 283.57 283.54 283.59 283.59 283.53 283.37 283.32 13 283.44 283.37 289.56 283.59 289.59 283.59 283.66 283.55 283.61 283.52 283.37 283.30 14 283.46 289.40 283.58 283.56 283.60 283.61 289.65 283.62 283.62 283.63 283.98 283.30 16 283.37 283.45 283.57 283.57 283.60 283.71 283.54 283.51 283.63 283.65 283.38 283.26 16 289.36 289.48 283.59 289.59 283.62 289.71 283.53 283.47 283.70 283.56 283.39 283.26 17 289.36 289.45 283.52 283.61 289.71 283.69 283.53 283.44 289.70 283.55 289.37 283.27 18 283.37 283.39 283.62 283.70 289.73 283.60 283.53 283.40 283.70 283.56 283.94 283.31 19 283.37 283.36 283.54 283.70 283.76 283.57 283.53 283.34 283.71 283.64 283.33 283.36 20 283.35 289.37 283.57 283.70 283.75 283.55 283.54 283.32 283.72 283.52 283.33 283.39 21 283.31 283.40 283.60 283.70 283.72 283.54 283.54 283.34 283.72 283.48 283.33 283.41 22 283.22 283.43 283.61 283.71 283.71 283.63 283.52 283.36 282.93 283.45 283.35 283.41 22 283.22 283.43 283.61 283.71 283.71 283.63 283.52 283.36 283.71 283.45 283.35 283.41 23 283.18 283.44 283.63 283.73 283.71 283.53 283.50 283.37 283.60 283.44 283.36 283.38 24 283.17 283.46 283.62 283.73 283.72 283.52 283.46 283.38 283.58 283.42 283.38 283.35 25 283.17 283.46 283.61 283.72 283.71 283.52 283.48 289.39 283.55 283.42 283.38 283.34 26 283.20 283.47 283.63 283.72 283.71 283.52 283.52 283.38 283.54 283.42 283.38 283.36 27 283.26 283.48 283.72 283.72 283.71 283.52 283.54 283.36 283.52 283.43 283.36 283.39 28 283.29 283.52 283.73 283.72 283.72 283.54 283.54 283.35 283.52 283.42 283.38 283.41 29 283.27 283.53 283.73 283.71 283.59 283.54 283.34 283.54 283.41 283.39 283.44 30 283.25 283.54 283.72 283.71 283.58 283.56 283.34 283.54 283.44 283.37 283.44 31 283.24 --- 283.71 283.71 283.56 283.33 283.46 283.34 LOW 283.57 283.54 283.73 283.73 283.84 283.72 283.56 283.58 283.02 283.61 283.46 283.44 HIGH 283.17 289.11 289.52 283.56 283.59 283.62 289.45 282.92 282.62 282.63 283.33 283.26 WTR YR 1985 MEAN 283.43 LOW 289.34 HIGH 282.62 277 279 . 281 z 283 285 SONDJFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 1981 1982 1983 1984 1985 I I I I I I I I I I I I I I I I I I I I I I I I I 328 GROUND-WATER LEVELS RIO GRANDE DE KARAT' BASIN 182445066315800. Local number, 142. LOCATION.--Lat 18024'46", long 66°31'58". Owner: P.R. Aqueduct and Sewer Authority. Name: Moran Simo. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 ) 0-147 ft (0-44.82 ), cased 20 in (0.51 ) 0-100 ft (0-30.49 ), diameter 16 in (0.41 a) 147-211 ft (44.82-64.33 ), diameter 12 in (0.30 ) 211-320 ft (64.33-97.56 a), cased 12 in (0.30 ) 0-320 ft (0-97.6 ), perforated 248-320 ft (75.6-97.6 m), diameter 10 in (0.25 ) 320-517 ft (97.6-158 ), cased 8 in (0.20 ) 300-617 ft (91.46-158 ), perforated 480-517 ft (146-168 ). Depth 517 ft (158 ). DATUM.--Elevation of land-surface datum is about 492 ft (150 a) above mean sea level, fro topographio map. Measuring point: Top of 1.75 in (0.04 ) hole on top of 3 in (0.08 ) casing, 1.0 ft (0.30 ) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--August 1981 to March 28, 1986, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 226.5 ft (69.06 ) below land-surface datum, May 21, 1982; lowest water level measured, 229.9 ft (70.09 a) below land-surface datum, May 29, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 15 229.1 Dec. 7 229.0 Jan. 16 228.8 Mar. 28 229.0 Nov. 2 228.9 182542066305200. Local number, 166. LOCATION.--Lat 18.26'42", long 66°30'52". Owner: P.R. Aqueduct and Sewer Authority. Name: Manati (New well). AQUIFER.--Alluviva of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 a), cased 0-100 ft (0-39.49 0, diameter 14 in (0.36 a), cased 0-140 ft (0-42.68 ), slotted 80-90 ft (24.39-27.44 ) and 130-140 ft (39.63-42.68 a). Depth 140 ft (42.68 ). DATUM.--Elevation of land-surface datum is about 29.50 ft (9.0 ) above mean-sea level, from topographic map. Measuring point: Top of 14 in (0.36 a) casing, 0.80 ft (0.24 ) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--January 1982 to December 7, 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 22.90 ft (6.98 ) below land-surface datum, Mar. 3, 1983; lowest water level measured, 26.36 ft (8.04 a) below land-surface datum, Feb. 3, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 15 25.46 Nov. 20 24.85 Dec. 7 25.31 I I I I I I I I I GROUND-WATER LEVELS RIO CIBUCO BASIN 182446066194800. Local number, 62. LOCATION.--Lat 18°24'46", long 66°19'48". Owner: P.R. Aqueduct and Sewer Authority. Name: Vega Alta 1. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled publio supply artesian well, diameter 16 to 12 in (0.41 to 0.30 ), cased 16 in (0.41 ) 0-50 ft (0-15.2 ), 12 in (0.30 a) 0-110 ft (0-33.54 ). Depth 210 ft (64.02 ). DATUM.--Elevation of land-surface datum is about 102 ft (31.10 ) above mean sea level, from topographic map. Measuring point: Lower edge of 0.75 in (0.02 ) pipe in pump base, 1.0 ft (0.30 ) above land-surface datum. REMARKS.--Observation well. Water levels affected by puaping. PERIOD OF RECORD.--January 1961 to March 6, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, a75.88ft (a23.13 ) below land-surface datum, Feb. 21, 1984; lowest water level measured, a137.9 ft (a42.04 ) below land-surface datum, Mar. 3, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Witter Date level Date level Date level Date Water Water level Oct. 15 a105.0 Dec. 3 a93.05 Jan. 16 a96.85 Mar. 6 a101.3 Nov. 27 al08.1 a Pumping. 329 330 UR0UND-WATER LEVELS RIO CIBUCO BASIN 182647066201700. Local number, 70. LOCATION.--Lat 18°26'47", long 66020'17". Owner: P.R. Aqueduct and Sewer Authority. Name: Sabana Hoyos. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled unused artesian well, diameter 8 in (0.20 m), cased 0-90 ft (0-27.43 m), perforated. Depth 90 ft (27.43 m). DATUM.--Elevation of land-surface datum is about 49 ft (14.9 m) above mean sea level, from topographic map. Measuring point: Top of casing wooden cover, 1.30 ft (0.40 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--February 1960 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 21.33 ft (6.50 m) below land-surface datum, Oct. 26, 1976; lowest water level recorded, 31.10 ft (9.48 m) below land-surface datum, July 31, 1975. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 28.84 29.00 28.32 28.34 28.41 28.82 28.84 28.74 27.06 28.37 28.82 28.98 2 28.86 28.98 28.33 28.29 28.44 28.80 28.83 28.74 27.12 28.40 28.82 28.98 3 28.88 28.96 28.34 28.25 28.46 28.78 28.83 28.73 27.18 28.43 28.84 28.98 4 28.90 28.86 28.35 28.23 28.49 28.78 28.83 28.74 27.22 28.46 28.85 28.97 5 28.92 28.76 28.36 28.21 28.52 28.77 28.83 28.74 27.28 28.49 28.86 28.98 6 28.94 28.67 28.37 28.20 28.54 28.76 28.83 28.74 27.34 28.51 28.86 28.98 7 28.95 28.58 28.39 28.18 28.56 28.75 28.86 28.76 27.38 28.54 28.87 28.98 8 28.95 28.49 28.39 28.17 28.59 28.74 28.86 28.77 27.43 28.56 28.88 28.99 9 28.95 28.41 28.40 28.17 28.60 28.73 28.87 28.79 27.48 28.58 28.88 28.99 10 28.95 28.35 28.40 28.17 28.63 28.71 28.88 28.82 27.54 28.60 28.89 28.99 11 28.96 28.32 28.38 28.15 28.65 28.70 28.89 28.83 27.59 28.62 28.89 28.99 12 28.97 28.30 28.36 28.12 28.67 28.69 28.88 28.84 27.64 28.64 28.90 28.99 13 29.00 28.29 28.35 28.10 28.69 28.70 28.88 28.85 27.69 28.66 28.91 28.98 14 29.02 28.28 28.34 28.09 28.70 28.70 28.88 28.86 27.73 28.67 28.92 28.95 15 29.03 28.27 28.34 28.08 28.71 28.71 28.87 28.86 27.78 28.69 28.94 28.93 16 29.05 28.26 28.34 28.09 28.73 28.72 28.87 28.85 27.83 28.70 28.96 28.91 17 29.07 28.24 28.32 28.11 28.75 28.73 28.88 28.82 27.87 28.72 28.96 28.90 18 29.10 28.22 28.32 28.12 28.77 28.74 28.90 28.55 27.92 28.73 28.96 .00 19 29.11 28.21 28.32 28.13 28.80 28.74 28.92 27.87 27.97 28.74 28.96 --- 20 29.13 28.20 28.32 28.14 28.81 28.75 28.93 27.13 28.01 28.73 28.98 28.89 21 29.12 28.20 28.32 28.15 28.82 28.76 28.93 26.80 28.05 28.73 28.99 28.88 22 29.10 28.20 28.34 28.17 28.83 28.77 28.93 26.68 28.09 28.74 29.00 28.87 23 29.09 28.21 28.35 28.19 28.84 28.78 28.93 26.64 28.13 28.74 29.01 28.86 24 29.08 28.22 28.35 28.21 28.85 28.79 28.89 26.63 28.16 28.74 29.03 28.84 25 29.07 28.24 28.36 28.23 28.85 28.80 28.85 26.65 28.19 28.75 29.03 28.83 26 29.07 28.25 28.37 28.26 28.85 28.81 28.81 26.69 28.22 28.75 29.03 28.83 27 29.07 28.27 28.38 28.29 28.86 28.83 28.77 26.74 28.25 28.76 29.03 28.84 28 29.07 28.27 28.39 28.31 28.84 28.84 28.76 26.79 28.28 28.77 29.01 28.84 29 29.07 28.29 28.40 28.34 --- 28.85 28.74 26.86 28.31 28.78 29.00 28.83 30 29.03 28.30 28.40 28.36 28.86 28.74 26.93 28.34 28.79 28.99 28.84 31 29.01 --- 28.37 28.39 28.84 --- 26.99 --- 28.80 28.98 --- LOW 29.13 29.00 28.40 28.39 28.86 28.86 28.93 28.86 28.34 28.80 29.03 28.99 HIGH 28.84 28.20 28.32 28.08 28.41 28.69 28.74 26.63 27.06 28.37 28.82 .00 'WTR YR 1985 MEAN 28.46 LOW 29.13 HIGH .00 20 3 22 9 1 ra 24 U < L. 26 z4g -.1 14 17, C:1 28 tr z 3 30 32 ASONDJFMAMJJASONDJFMAMJJASONDJFMAMJ JASONDJFMAMJJ AS 1981 1982 1983 1984 1985 I I I I I I I I I I I I I I I I I I I I 331 GROUND-WATER LEVELS RIO CIBUCO BASIN 182706066213500. Local number, 151. LOCATION:--Lat 18.27'06", long 66°21'35". Owner: AFDA - P.R. Department of Agriculture. Name: Rice Program #3. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled agricultural water-table well, diameter 18 in (0.46 m), cased 0-80 ft (0-24.39 a), diameter 16 in (0.41 ), open hole 80-160 ft (24.39-48.78 ). Depth 160 ft (48.78 a). DATUM.--Elevation of land-surface datum is about 19.69 ft (6.0 ) above mean sea level, from topographic map. Measuring point: Bottom of 1 in (0.02 ) hole at side of casing, 2.40 ft (0.73 m) above land-surface datum. REMARKS.--Observation well. Irrigation water supply. PERIOD OF RECORD.--January 13, 1982 to December 5, 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 3.72 ft (1.13 ) below land-surface datum, Jan. 13, 1982; lowest water level measured, a41.78 ft (a12.74 ) below land-surface datum, Aug. 17, 1982. WATER LEVELS IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 11 6.40 Nov. 20 5.89 Deo. 5 6.03 182612066225400. Local number, 155. LOCATION:--Lat 18.26'12", long 66°22'54". Owner: P.R. Aqueduct and Sewer Authority. Name: La Trocha. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 ), cased 0-70 ft (0-21.34 ), diameter 16 in (0.41 ), cased 0-100 ft (0-30.49 a), perforated 100-200 ft (30.49-60.97 ) Depth 200 ft (61.0 a). DATUM.--Elevation of land-surface datum is about 49.20 ft (15.0 ) above mean sea level, from topographic map. Measuring point: Top of 20 in (0.51 ) casing, 2.10 ft (0.64 a) above land-surface datum. REMARKS.--Observation well. Never used as water supply well due to high concentrations of chlorides. PERIOD OF RECORD.--January 14, 1982 to December 5, 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 32.23 ft (9.83 ) below land-surface datum, Jan. 14, 1982; lowest water level measured, 34.62 ft (10.55 ) below land-surface datum, May 29, 1984. WATER LEVELS IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 15 34.22 Nov. 27 34.00 Dec. 6 33.92 182648066230900. Local number, 156. LOCATION.--Lat 18.26'48", long 66°23'09". Owner: P.R. Aqueduot and Sewer Authority. Name: El Criollo #1 . AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 20 in (0.51 a), cased 0-98 ft (0-29.88 a), diameter 16 in (0.41 ), perforated 88-120 ft (26.83-36.58 m). Depth 120 ft (36.58 ). DATUM.--Elevation of land-surface datum is about 49.20 ft (15.0 ) above mean sea level, from topographic map. Measuring point: Upper edge of 2 in (0.05 ) pipe on pump base, 1.80 ft (0.55 m) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.--January 14, 1982 to March 6, 1986, discontinued. EXTREMES OF PERIOD OF RECORD.--Highest water level measured, 40.52 ft (12.36 ) below land-surface datumn, Fob. 16, 1982; lowest water level measured, a47.30 ft (a14.42 ) below land-surface datum, Apr. 5, 1983. WATER LEVELS IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 15 a43.36 Deo. 5 a43.13 Jan. 16 a42.91 Mar. 6 a43.00 Nov. 2 a43.07 a Pumping. I I I I I I I I I I I I I I I I I I I I I I I I I I 332 GROUND-WATER LEVELS RIO CIBUCO BASIN 182666066221500. Local number, 167. LOCATION.--Lat 18°26'56", long 66°22'15" Owner: P. R. Land Authority, AFDA. Name: U.S.G.S. Observation Well #3. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 ), cased 6 in (0.15 m) 0-228 ft (0-69.51 ), open hole 228-238 ft (69.51-72.66 ). Depth 238 ft (72.56 ). DATUM.--Elevation of land-surface datum is about 13.12 ft (4.0 ) above mean sea level, fro topographic map. Measuring point: Top of 6 in (0.16 ) casing, 9.10 ft (0.94 ) above land-surface datum. REMARKS.--Observation well. Water levels affected by nearby pumpage. PERIOD OF RECORD.--January 1982 to December 5, 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 13.07 ft (3.98 ) below land-surface datum, Jan. 13, 1982; lowest water level measured, o16.90 ft (o5.15 ) below land-surface datum, Aug. 18, 1983. WATER LEVELS IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oot. 11 16.12 Nov. 20 14.63 Dec. 5 14.76 182751066221900. Local number, 168. LOCATION.--Lat 18°27'51", long 66°22'19". Owner: AFDA. P.R. Department of Agriculture. Name: Rice Program #4. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled agricultural water-table well, diameter 16 in (0.41 m), cased 16 in (0.41 a), 0-156 ft (0-32.3 ), slotted 66-106 ft (17.07-32.31 a), open hole 106-160 ft (32.91-46.73 ). Depth 160 ft (46 73 ). DATUM.--Elevation of land-surface datum is about 9.84 ft (3.0 ) above mean sea level, from topographic map. Measuring point: Top of 16 in (0.41 ) casing, 0.80 ft (0.24 ) above land-surface datum. REMARKS.--Observation well. Irrigation water supply well. PERIOD OF RECORD.--March 17, 1982 to January 16, 1986, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 4.75 ft (1.46 ) below land-surface datum, Dec. 5, 1984; lowest water level measured, a53.85 ft (a16.42 ) below land-surface datum, July 26, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 11 a28.68 Nov. 20 5.01 Dec. 5 4.75 Jan. 15 4.96 182740066223000. Local number, 169. LOCATION.--Lat 18027'40", long 66°22'30". Owner: AFDA. P.R. Department of Agriculture. Name: Rice Program #6. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled agricultural water-table well, diameter 16 in (0.41 ), cased 16 in (0.41 m) 0-80 ft (0-24.39 ), open hole 80-140 ft (24.39-42.68 ). Depth 140 ft (42.68 ). DATUM.--Elevation of land-surface datum is about 13.10 ft (4.0 ) above mean sea level, from topographic map. Measuring point: Top of 16 in (0.41 m) casing, 0.10 ft (0.03 ) above land-surface datum. REMARKS.--Observation well. Irrigation water supply well. PERIOD OF RECORD.--March 17, 1982 to December 5, 1984, discontinued EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 6.15 ft (1.88 ) below land-surface datum, Mar. 17, 1982; lowest water level measured, a15.60 ft (a4.76 ) below land-surface datum, July 26, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 11 al1.30 Nov. 20 6.40 Dec. 5 6.54 a Pumping. c Pumping nearby well GROUND-WATER LEVELS 333 RIO DE LA PLATA BASIN 180708086084200. Local number, 33. LOCATION.--Lat 18007'08", long 66008'42". Owner: P.R. Aqueduct and Sewer Authority. Name: Cayey 10. AQUIFER.--Volcanic rocks of Cretaoeous Age. WELL CHARACTERISTICS.--Drilled public supply artesian well, diameter 16 to 12 in (0.41 to 0.31 acased 16 in (0.41 a) 0-30 ft (0-9.14 a), 12 in (0.30 a) 0-200 ft (0-60.97 a), perforated 30-200 ft (9.14-60. 97 9 a), gravel packed 0-190 ft (0-57.92 a). Depth 220 ft (67.07 a). DATUM.--Elevation of land-surface datum is about 1,280 ft (390 a) above mean sea level, from topographic map. Measuring point: Lower edge of 0.75 in (0.02 a) pipe in pump base, 1.20 ft (0.37 a) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.--September 1969 to March 1, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 1.49 ft (0.45 m) below land-surface datum, Jan. 18, 1961; lowest water level measured, a169.2 ft (a51.58 m) below land-surface datum, Dec. 10, 1976. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 26 a88.96 Dec. 12 a46.33 Feb. 12 a109.9 Mar. 1 a107.3 Nov. 29 a83.94 Jan. 29 a96.08 180852066096400. Local number, 37. LOCATION.--Lat 18008'52", long 66009'54". Owner: P.R. Aqueduct and Sewer Authority. Name: Barrio Rincon de Cidra. AQUIFER.--Volcanic rocks of Cretaceous Age. WELL CHARACTERISTICS.--Drilled water supply water-table well, diameter 16 to 8 in (0.41 to 0.20 a), cased 16 in (0.41 a) 0-30 ft (0-9.15 a), 12 in (30 cm) 0-43 ft (0-13.10 m), perforated 0-43 ft (0-13.10 a). Depth 200 ft (60.97 m). DATUM.--Elevation of land-surface datum is about 1,180 ft (359.7 a) above mean sea level, from topographic map. Measuring point: Lower edge at 0.75 in (0.02 a) pipe, 1.90 ft (0.68 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--June 1960 to March 5, 1985. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 14.38 ft (4.38 a) below land-surface datum, July 20, 1979; lowest water level measured, 62.87 ft (19.16 a) below land-surface datum, Jul. 5, 1961. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 25 22.95 Dec. 12 16.87 Feb. 12 21.92 Mar. 5 23.00 Nov. 29 16.44 Jan. 16 19.45 180823066154500. Local number, 38. LOCATION.--Lat 18008'23", long 66.15'46". Owner: P.R. Aqueduct and Sewer Authority. Name: Barrio Robles. AQUIFER.--Volcanio rocks of Cretaoeous Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 10 in (0.25 a). Depth 82 ft (25.0 a). DATUM.--Elevation of land-surface datum is about 1,980 ft (603 m) above mean sea level, from topographic map. Measuring point: Top of clean-out door sill, 1.80 ft (0.55 al above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1969 to December 13, 1984, discontinued; changed to a partial site on Sept. 2, 1981. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 3.60 ft (1.10 m) above land-surface datum, Sept. 6, 1960; lowest water level measured, 61.47 ft (15.69 a) below land-surface datum, Sept. 30, 1977. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 25 8.54 Nov. 29 7.18 Dec. 13 5.92 a Pumping. I I I I I I I I I I I I I I I I 334 GROUND-WATER LEVELS RIO DE LA PLATA BASIN 182636066164200. Local number, 69. LOCATION.--Lat 18.26'36", long 66°16'42". Owner: P.R. Aqueduct and Sewer Authority. Name: Higuillar. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 10 in (0.25 ) Depth 200 ft (60.97 ). DATUM.--Elevation of land-surface datum is about 60 ft (18.3 ) above mean sea level, fro topographic map. Measuring point: Airline hole in pump base, 1.10 ft (0.34 a) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.--July 1968 to March 28, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 41.21 ft (12.56 ) below land-surface datum, July 3, 1958; lowest water level measured, 58.89 ft (17.95 ) below land-surface datum, Oct. 26, 1977. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 15 a49.04 Dec. 3 a49.64 Jan. 16 a48.47 Mar. 28 a49.16 Nov. 27 a49.04 182623066181400. Local number, 150. LOCATION.--Lat 18.26'23", long 66.18'14". Owner: Department of Agriculture, Land Authority; loaned to Puerto Rico Aqueduct and Sewer Authority. Name: Monterey Forestal. AQUIFER.--Aymanon Limestone. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 12 in. (0.30 ), cased 12 in (0.30 ) 0-300 ft (0-91.46 ), open hole 300-400 ft (91.46-121.9 ). Depth 400 ft (121.9 ). DATUM.--Elevation of land-surface datum is about 131.2 ft (40 a) above mean sea level, fro topographic map. Measuring point: Bottom edge of 1 in. (0.02 ) pipe on top of pump concrete base, 1.00 ft (0.30 ) above land-surface datum. REMARKS.--Irrigation supply observation well. PERIOD OF RECORD.--January 1982 to December 3, 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, a182.3 ft (a55.56 ) below land-surface datum, Dec. 3, 1984; lowest water level measured, a210.9 ft (a64.29 ) below land-surface datum, Apr. 15, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 15 193.5 Nov. 27 183.3 Dec. 3 182.3 a Pumping. I I I I I I I I I I I I I I I I 335 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 181046066091700. Local number, 42. LOCATION.--Lat 18.10'46", long 66°09'17". Owner: P.R. Aqueduct and Sewer Authority. Name: Cidra 2. AQUIFER.--Volcanic rooks of Cretaceous Age. WELL CHARACTERISTICS.--Drilled public supply artesian well, diameter 13 in (0.93 a), cased 0-64 ft (0-19.51 ), perforated 16-64 ft (4.88-19.61 ). Depth 92 ft (28.05 ). DATUM.--Elevation of land-surface datum is about 1,340 ft (408 ) above seen sea level, fro topographic sap. Measuring point: Airline hole in pump base, 1.40 ft (0.49 a) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1969 to March 5, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 12.30 ft (3.75 a) below land-surface datum, Dec. 27, 1979; lowest water level measured, 56.32 ft (17.17 ) below land-surface datum, Apr. 1, 1968. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 25 17.36 Dec. 12 16.20 Feb. 12 17.04 Mar. 5 17.51 Nov. 29 15.14 Jan. 16 16.56 182506066030800. Local number, 65. LOCATION.--Lat 18.25'06", long 66003'08". Owner: P.R. Aqueduct and Sewer Authority. Name: Hato Rey Central, McCracken well. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 16 in (0.38 a), cased 0-205 ft (0-62.50 m), perforated 64-205 ft (19.51-62.50 ). Depth 206 ft (62.50 ). DATUM.--Elevation of land-surface datum is about 33 ft (10.1 a) above mean sea level, from topographic map. Measuring point: Top of casing 3.40 ft (1.04 ) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--July 1958 to February 14, 1986, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 22.40 ft (6.83 ) below land-surface datum, Aug. 12, 1976; lowest water level measured, 42.40 ft (12.92 ), below land-surface datum, May 13, 1974. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 26 30.46 Dec. 19 30.62 Jan. 17 90.69 Feb. 14 30.74 Nov. 27 30.57 182547066110800. Local number, 66. LOCATION.--18°25'47", long 66.11'08". Owner: P.R. Aqueduct and Sewer Authority. Name: Sabana Seca. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled public supply water-table well. Depth 130 ft (39.63 ). DATUM.--Elevation of land-surface datum is about 75 ft (22.87 ) above mean sea level, from topographic map. Measuring point: Lower edge of 0.75 in (0.02 ) pipe in pump base, 1.20 ft (0.37 ) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.--June 1958 to March 28, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, a39.23 ft (a11.96 ) below land-surface datum, Dec. 17, 1981; lowest water level measured, 57.75 ft (17.60 a), below land-surface datum, Aug. 13, 1976. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 16 44.60 Dec. 3 45.30 Jan. 16 44.23 Mar. 28 44.72 a Pumping. I I I I I I I I I I I I I I I I I 336 GROUND-WATER LEVELS RIO GRANDE DE LOW. BASIN 181550065693200. Local number, 50. LOCATION.--Lat 18.15'50", long 65°59'32". Owner: Gurabo Agricultural Experimental Station. Name: Gumbo. AQUIFER.--Unconsolidated deposits of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 13 in (0.33 ). Depth 145 ft (44.21 a). DATUM.--Elevation of land-surface datum is about 148 ft (45.12 ) above mean sea level, fro topographic map. Measuring point: Top of 12 in (0.30 ) casing, 0.80 ft (0.24 ) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--December 1960 to March 5, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 12.65 ft (3.86 ) below land-surface datum, Sept. 9, 1975; lowest water level measured, 44.38 ft (13.53 a) below land-surface datum, June 18, 1975. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 13 29.86 Deo. 6 29.40 Feb. 11 30.34 Mar. 5 29.74 Nov. 19 27.36 Jan. 15 30.62 181538066021300. Local number, 52. LOCATION.--Lat 18.15'38", long 66°02'13". Owner: P.R. Aqueduct and Sewer Authority. Name: Bairoa. AQUIFER.--Unconsolidated deposits of Quaternary Age. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 16 to 10 in (0.41 to 0.25 ) 0-69 ft (0-21.04 ), 79-100 ft (24.08-30.49 a), 110-116 ft (33.54-35.37 ), perforated 79-100 ft (24.08-30.49 m), screened 69-79 ft (21.04-24.08 ) and 100-110 ft (30.49-33.64 ); gravel packed to 113 ft (34.45 ). Depth 116 ft (35.37 ). DATUM.--Elevation of land-surface datum is about 200 ft (60.98 ) above mean sea level, from topographic nap. Measuring point: Airline hole in pump base, 1.40 ft (0.43 ) above land-surface datum. REMARKS.--Observation well. Water level affected by pumping. PERIOD OF RECORD.--July 1959 to March 6, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, +0.92 ft (+0.28 a) below land-surface datum, Nov. 15, 1979; lowest water level measured, a115.1 ft (a35.09 ) below land-surface datum, June 18, 1975. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 23 a80.60 Deo. 6 a78.50 Feb. 11 17.32 Mar. 6 a57.32 Nov. 19 a74.27 Jan. 15 16.60 + Above land-surface datum. a Pumping. I I I I I 337 GROUND-WATER LEVELS RIO HERRERA TO RIO ANTON RUIZ BASINS 181217065453000. Local number, 171. LOCATION.--Lat 18°12'17", long 65°45'30". Owner: Carlos Arroyo and Roberto Ramirez. Name: Arroyo well #1. AQUIFER.--Alluvium. WEld. CHARACTRRISTICS.--Test woll drIllbd by the 115tH, diameter 4-2 in (0.10-0.05 a). °wand 4 In (0.10 m) 0-29 ft (0-8.84 ), 2 in (0.05 ) 29-32 (8.84-9.76 m), 2 in (0.05 a) slotted PVC screen 29-32 ft (8.84-9.76 a). Depth 32 ft (9.76 a). DATUM.--Elevation of land-surface datum is about 19.10 ft (5.82 ) above mean sea level, fro topographic map. Measuring point: Mark on shelf of gage house, 6.00 ft (1.83 ) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--June 1983 to June 28, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 1.35 ft (0.41 a) below land-surface datum, May 18, 1985; lowest water level measured, 10.87 ft (3.31 m) below land-surface datum, May 17, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 8.46 8.22 8.26 8.31 8.50 7.43 6.93 4.96 6.28 5.06 8.08 7.89 7.33 7.42 7.58 8.04 6.90 7.34 7.75 7.92 9.08 9.09 9.15 9.17 9.21 7.88 8.20 8.34 8.45 8.53 7.56 7.87 8.04 8.18 8.32 8.49 8.55 8.34 8.49 8.55 8.49 8.64 8.59 8.69 8.71 6 7 8 9 10 8.08 8.32 8.18 7.31 6.42 1.82 3.46 4.83 5.10 5.91 7.78 7.82 7.88 7.94 7.30 7.31 7.54 7.83 7.88 7.97 9.25 9.28 9.32 9.35 9.40 8.27 8.05 7.33 7.51 7.81 8.43 8.58 8.53 8.61 8.66 8.58 8.68 8.66 8.75 8.74 8.82 8.85 8.90 8.95 9.01 11 12 13 14 15 7.17 7.20 7.41 4.30 6.65 6.56 6.90 7.16 7.20 6.07 7.77 7.85 8.00 8.15 8.26 7.93 8.05 8.11 8.21 8.18 9.32 9.40 9.40 9.42 9.39 8.04 8.18 8.29 8.44 8.49 8.73 8.71 8.79 8.83 8.90 8.80 8.54 8.54 8.23 4.50 9.07 9.08 9.13 9.20 9.26 16 17 18 19 20 6.67 7.15 7.19 7.49 7.53 6.87 6.65 7.13 7.25 7.24 8.28 7.77 8.13 8.35 8.36 8.39 8.46 8.50 8.57 8.64 9.45 9.48 9.48 9.38 9.29 8.54 8.58 8.60 8.56 8.64 8.68 8.68 8.50 8.81 8.93 5.01 4.37 1.72 5.08 6.17 9.32 9.34 9.40 9.40 9.40 21 22 23 24 25 6.98 7.33 7.64 7.86 7.47 7.43 7.52 7.49 7.70 7.81 8.49 8.54 8.62 8.61 8.32 8.66 8.72 8.76 8.80 8.84 9.43 9.47 9.48 8.97 9.29 8.61 8.74 8.80 8.89 8.96 8.80 8.98 9.09 7.81 7.69 6.75 7.13 7.39 7.62 7.79 9.48 9.51 9.51 9.53 9.52 26 27 28 29 30 31 7.95 7.70 7.88 7.36 7.69 7.84 7.54 7.64 7.84 7.93 7.97 --- 8.46 8.17 7.96 8.28 7.81 7.39 8.86 8.88 8.90 8.96 9.03 9.06 9.28 8.46 6.39 --- 9.04 8.51 8.48 5.19 7.02 6.94 7.96 8.13 8.28 8.37 8.40 --- 7.94 8.06 8.16 8.21 8.31 8.44 9.56 9.59 .00 --- LOW HIGH 8.50 4.30 7.97 1.82 8.62 7.30 9.06 6.90 9.48 6.39 9.04 5.19 9.09 7.56 8.80 1.72 9.59 .00 WTR YR 1985 MEAN 8.04 LOW 9.59 HIGH .00 -r LiJ 1 8 12 JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY 1983 1984 1985 338 GROUND-WATER LEVELS RIO HERRERA TO RIO ANTON RUIZ BASINS 180908065475000. Loom] number, 173. LOCATION.--Lat 18°09'08", long 65°47'50". Owner: Squibb Manufacturing, Inc. Name: Squibb observation well #3. AQUIFER.--Alluvium. WELL CHARACTERISTICS.--Drilled unused water-table industrial well, diameter 10 in (0.25 m), cased 10 in (0.25 m), perforated 60-110 ft (18.29-33.54 a). Depth 110 ft (33.54 a). DATUM.--Elevation of land-surface datum is about 21 ft (6.40 m) above mean sea level, from topographic map. Measuring point: Mark on shelf of gage house, 3.00 ft (0.91 a) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--July 1983 to March 4, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 2.77 ft (0.84 a) below land-surface datum, Dec. 26, 1984; lowest water level measured, 10.44 ft (3.18 m) below land-surface datum, May 19, 20, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 3.75 3.76 3.75 3.74 4.08 6.41 6.42 6.19 5.81 5.54 5.20 5.24 5.28 5.32 5.37 5.12 5.03 5.63 6.18 6.70 9.06 8.68 8.39 8.19 8.05 9.85 9.81 9.83 9.85 --- 6 7 8 9 10 4.41 4.71 4.87 4.99 5.02 5.52 5.36 5.36 6.47 5.71 5.41 5.46 5.47 5.49 5.49 6.52 6.05 6.53 7.01 7.42 7.93 7.86 7.77 7.72 7.68 11 12 13 14 15 5.16 5.30 5.39 5.32 5.35 5.83 6.80 5.79 5.57 5.34 5.52 5.56 5.62 5.67 5.69 7.76 8.00 8.15 8.08 7.96 7.65 8.01 8.48 8.78 9.01 16 17 18 19 20 5.42 5.46 5.50 5.56 5.60 5.06 4.75 4.49 4.26 4.14 5.71 5.72 5.75 5.78 5.81 7.92 8.06 8.28 8.50 8.69 9.26 9.46 9.62 9.77 9.84 21 22 23 24 25 5.66 5.68 5.71 5.74 5.78 4.22 4.34 4.48 4.60 4.71 5.39 4.51 3.73 3.13 3.03 8.86 8.96 9.13 9.27 9.35 9.96 10.02 10.11 10.14 10.18 26 27 28 29 30 31 5.79 5.97 6.14 6.24 6.35 6.41 4.76 4.83 4.94 5.01 5.13 --- 2.79 3.49 4.63 4.83 4.83 4.75 9.27 9.16 9.07 8.95 9.00 9.20 10.23 10.17 10.03 --- LOW HIGH 6.41 3.74 6.42 4.14 5.81 2.79 9.35 5.03 10.23 7.65 9.86 9.81 WTR YR 1985 MEAN 6.51 LOW 10.23 HIGH 2.79 1 1 6 11 JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB 1983 1984 1985 I I I I I I I I I GROUND-WATER LEVELS 339 RIO HUMACAO TO RIO SECO BASINS 176735066095900. Local number, 2. LOCATION.--Lat 17057'35", long 66009'59". Owner: P.R. Aqueduct and Sewer Authority. Name: Puente Jobos. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 21 in (0.63 a). Depth 148 ft (45.12 a). DATUM.--Elevation of land-surface datum is about 26 ft (7.93 a) above mean sea level, from topographic map. Measuring point: Bottom edge of 0.88 in (0.02 ) pipe, 1.70 ft (0.52 a) above land-surface datum. REMARKS.--Observation well. Lowest water level is a pumping level. PERIOD OF RECORD.--February 1961 to Maroh 7, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 2.86 ft (0.87 a) below land-surface datua. July 24, 1979; lowest water level measured, 61.78 ft (18.83 ) below land-surface datum, Aug. 6, 1964. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 24 4.83 Dec. 11 5.77 Feb. 28 6.59 Mar. 7 6.53 Nov. 16 5.56 Jan. 29 6.63 175735066100400. Local number, 3. LOCATION.--Lat 17.57'35", long 66.10'04". Owner: P.R. Aqueduct and Sewer Authority. Name: Jobos. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Bored unused artesian well, diameter 4 in (0.10 ). Depth 16 ft (4.88 a). DATUM.--Elevation of land-surface datum is about 25 ft (7.62 ) above mean sea level, fro topographic map. Measuring point: Top of 6 in (0.13 ) fitting, 0.50 ft (0.15 ) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--November 1959 to December 11, 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 0.01 ft (0.30 ) below land-surface datum, Jan. 3, 1963; lowest water level measured, dry at 16 ft (4.88 ) below land-surface datum, many days during 1968 and 1969. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 24 1.60 Nov. 16 1.21 Dec. 11 1.28 340 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 a). Depth 173 ft (52.74 a) reported, 110 ft (33.54 m) measured. DATUM.--Elevation of land-surface datum is about 127 ft (38.72 a) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 3.00 ft (0.91 above land-surface datum. After Aug. 7, 1981, top of 16 in (0.41 a) casing, 1.55 ft (0.47 m) above land-surface datum. REMARKS.--Recording installed on Jan. 25, 1962. PERIOD OF RECORD.--November 1960 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 26.20 ft (7.99 a) below land-surface datum, Dec. 10, 1979; lowest water level measured, 65.95 ft (20.10 is) below land-surface datum, June 2, 1968. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 54.49 53.22 43.99 42.05 43.86 46.50 48.70 50.23 48.55 48.01 48.67 50.58 2 54.52 53.15 43.85 42.11 43.95 46.56 48.77 50.28 48.47 48.05 48.61 50.62 3 54.55 53.09 43.74 42.19 44.03 46.62 48.84 50.32 48.38 48.08 48.57 50.66 4 54.58 52.99 43.63 42.26 44.13 46.69 48.89 50.33 48.29 48.13 48.60 50.71 5 54.62 52.86 43.46 42.35 44.22 46.75 48.95 50.32 48.21 48.18 48.64 50.77 6 54.67 52.68 43.25 42.40 44.34 46.80 49.01 50.32 48.16 48.23 48.69 50.83 7 54.72 52.39 43.05 42.43 44.47 46.86 49.08 50.35 48.12 48.28 48.77 50.89 8 54.77 51.97 42.87 42.46 44.58 46.93 49.16 50.39 48.09 48.33 48.86 50.95 9 54.83 51.36 42.73 42.52 44.67 46.99 49.24 50.43 48.07 48.39 48.93 51.03 10 54.88 50.69 42.63 42.59 44.76 47.06 49.31 50.49 48.05 48.45 48.98 51.10 11 54.90 50.05 42.56 42.66 44.85 47.14 49.32 50.54 48.02 48.46 49.03 51.17 12 54.88 49.47 42.52 42.71 44.95 47.22 49.40 50.60 48.00 48.42 49.01 51.24 13 54.82 48.96 42.45 42.76 45.05 47.31 49.50 50.66 47.97 48.39 49.05 51.31 14 54.75 48.53 42.39 42.81 45.14 47.39 49.56 50.73 47.93 48.37 49.14 51.38 15 54.67 48.12 42.30 42.86 45.23 47.49 49.61 50.79 47.90 48.34 49.22 51.44 16 54.57 47.51 42.18 42.90 45.32 47.58 49.66 50.83 47.88 48.36 49.27 51.51 17 54.46 47.17 42.06 42.92 45.41 47.68 49.72 50.78 47.85 48.42 49.36 51.57 18 54.35 46.88 42.06 42.95 45.50 47.74 49.74 50.71 47.82 48.44 49.45 51.62 19 54.48 46.60 42.02 42.99 45.59 47.82 49.80 50.62 47.78 48.41 49.65 51.68 20 54.31 46.34 41.97 43.04 45.66 47.90 49.86 50.47 47.77 48.41 49.64 51.74 21 54.12 46.09 41.95 43.11 45.75 47.98 49.91 50.29 47.80 48.45 49.74 51.78 22 53.96 45.86 41.92 43.19 45.87 48.06 49.95 50.08 47.80 48.52 49.84 51.82 23 53.85 45.65 41.90 43.30 45.96 48.15 49.98 49.87 47.78 48.60 49.94 51.88 24 53.76 45.45 41.90 43.44 46.05 48.24 50.00 49.66 47.80 48.67 50.02 51.94 25 53.69 45.25 41.88 43.55 46.12 48.33 50.02 49.45 47.84 48.72 50.11 51.98 26 53.62 45.00 41.87 43.61 46.21 48.40 50.06 49.26 47.90 48.75 50.18 52.01 27 53.56 44.78 41.85 43.63 46.35 48.48 50.09 49.09 47.96 48.77 50.26 52.02 28 53.50 44.60 41.86 43.64 46.42 48.56 50.12 48.95 47.97 48.79 50.32 52.02 29 53.44 44.43 41.89 43.65 --- 48.64 50.16 48.82 47.97 48.79 50.38 52.02 30 53.37 44.21 41.94 43.70 48.67 50.19 48.72 47.98 48.78 50.45 52.02 31 53.30 --- 41.98 43.77 48.66 --- 48.63 --- 48.74 50.52 --- LOW 54.90 53.22 43.99 43.77 46.42 48.67 50.19 60.83 48.55 48.79 50.52 52.02 HIGH 53.30 44.21 41.85 42.05 43.86 46.50 48.70 48.63 47.77 48.01 48.57 50.58 WTR YR 1985 MEAN 48.17 LOW 54.90 HIGH 41.85 40 @I 4s anq ff z 6- 50 La v., gni `g 55 60 ASONDJFMAMJJASOND JFMAMJJASONDJFMAMJ JASONDJFMAMJJAS 1981 1982 1983 1984 1985 341 GROUND-WATER LEVELS RIO HUMACAO TO RIO SECO BASINS 175944066033600. Local number, 15. LOCATION.--Lat 17°59'44", long 66°03'36". Owner: P.R. Aqueduct and Sewer Authority. Name: Pitahaya 1. AQUIFER.--Volcanic rocks of Cretaceous Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 12 in (0.30 a). Depth 181 ft (55.18 a). DATUM.--Elevation of land-surface datum is about 130 ft (39.63 m) above mean sea level, from topographic map. Measuring point: Bottom of inspection door, 1.10 ft (0.34 m) above land-surface datum. REMARKS.--Recording observation well. Water levels affected by pumping of nearby well. PERIOD OF RECORD.--September 1959 to June 11, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 3.00 ft (0.91 m) below land-surface datum, Oct. 7, 1970; lowest water level recorded, 43.90 ft (13.38 a) below land-surface datum, May 20, 1968. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 8.97 9.12 9.24 9.29 9.39 9.08 8.79 7.40 6.60 6.17 9.05 9.09 8.88 9.00 9.09 9.94 9.95 9.97 9.98 10.02 11.04 11.12 11.26 11.40 11.51 10.38 10.56 10.71 10.88 11.33 11.29 11.67 12.08 12.42 12.72 12.33 13.05 14.12 15.64 16.59 10.08 10.20 10.30 10.45 10.65 6 7 8 9 10 9.34 9.20 9.02 8.99 7.06 5.94 5.55 6.36 6.93 7.32 9.15 9.21 9.27 9.31 9.32 10.05 10.08 10.11 10.16 10.18 11.61 11.72 11.84 12.06 12.18 11.70 11.12 10.72 10.71 10.83 13.15 13.51 13.23 13.55 13.99 16.97 16.94 17.50 17.91 18.29 10.83 11.01 11.22 11.41 11.58 11 12 13 14 15 7.17 7.56 7.84 7.85 7.65 7.63 7.85 8.01 8.10 8.18 9.35 9.39 9.43 9.48 9.52 10.16 10.19 10.22 10.23 10.27 12.37 12.55 12.74 12.71 10.86 11.10 11.39 11.67 11.95 12.27 14.54 15.16 15.63 15.26 15.55 18.88 19.09 19.05 18.58 13.21 11.80 16 17 18 19 20 7.75 7.67 7.84 8.02 8.18 8.29 8.39 8.47 8.53 8.58 9.55 9.58 9.63 9.67 9.69 10.31 10.35 10.38 10.41 10.43 10.53 10.59 10.66 10.84 10.88 12.48 12.69 11.24 10.26 10.20 16.17 16.50 15.41 13.90 13.71 10.37 9.41 8.80 7.87 8.00 21 22 23 24 25 8.31 8.37 8.46 8.55 8.66 8.63 8.71 8.73 8.79 8.80 9.74 9.76 9.79 9.79 9.76 10.42 10.46 10.50 10.57 10.66 10.79 11.01 11.20 11.21 11.21 10.31 10.49 10.68 10.87 11.10 13.89 13.81 13.86 12.09 11.03 8.19 8.32 8.68 8.94 8.85 26 27 28 29 30 31 8.76 8.84 8.92 8.95 9.02 9.07 8.56 8.75 8.86 8.95 9.00 --- 9.80 9.80 9.84 9.89 9.91 9.92 10.69 10.66 10.75 10.72 10.87 10.96 11.21 11.21 10.44 --- 11.46 11.80 12.16 12.15 11.21 11.14 10.96 10.72 10.87 11.30 11.74 --- 8.97 9.50 9.64 9.72 9.76 9.95 LOW HIGH 9.39 7.06 9.08 5.55 9.92 8.88 10.96 9.94 12.74 10.44 12.69 10.20 16.50 10.72 19.09 7.87 11.80 10.08 WTR YR 1985 MEAN 10.62 LOW 19.09 HIGH 5.55 14 Z 4C 19 3 24 ASONDJFMAMJ JASONDJFMAMJ JASONDJ FMAMJ J ASOND JFMAMJ 1981 1982 1983 1984 1985 29 I I I I I I I I I I I I 342 GROUND-WATER LEVELS RIO HUMACAO TO RIO SECO BASINS 180344065523000. Local number, 31. LOCATION.--Lat 18.03'44", long 65°52'30". Owner: P.R. Aqueduct and Sewer Authority. Name: Central Roig. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 20 in (0.51 m), 0-120 ft (0-36.58 cm), 12 in (0.30 ) 120-125 ft (36.58-38.11 ), cased 0-125 ft (0-38.11 ), perforated 40-125 ft (12.20-38.11 m). Depth 126 ft (38.11 a). DATUM.--Elevation of land-surface datum is about 41 ft (12.50 a) above mean sea level, fro topographic mup. Measuring point: Airline hole in pump base, 4.00 ft (1.22 a) above land-surface datum. REMARKS.--Observation well. Drilled 6 ft (1.52 ) into rock. Affected by nearby pumping. PERIOD OF RECORD.--July 1959 to August 1973; April 1975 to March 4, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 5.86 ft (1.79 ) below land-surface datum, Sept. 20, 1960; lowest water level measured, a50.57 ft (a15.41 ) below land-surface datum, July 7, 1977. WATER LEVEL, IN FRET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 19 a39.43 Deo. 12 a35.63 Feb.12 a28.28 Mar. 4 a28.40 Nov. 21 a35.02 Jan. 16 a30.95 175640066085100. Local number, 89. LOCATION.--Lat 17.56'40", long 66°08'51". Owner: Phillips Puerto Rico Core, Inc. Name: Phillips observation well 3. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled test well, diameter 4 in (0.10 m). Depth 114 ft. (34.75 m). DATUM.--Elevation of land-surface datum is about 6 ft (1.8 ) above mean sea level, fro topographic map. Measuring point: Top of casing, 2.25 ft (0.69 ) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--October 1968 to December 11, 1984, discontinued; changed to a partial site on Out. 1, 1981. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, +2.70 ft (+0.82 ) above land-surface datum, Jan. 9, 1973; lowest water level measured, 4.32 ft (1.32 ) below land-surface datum, June 6, 1981. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 24 0.19 Nov. 16 0.23 Dec. 11 0.28 + Above land-surface datum. a Pumping. tJ \T v 10 26 GROUND-WATER LEVELS 343 RIO HUMACAO TO RIO SECO BASINS 180415065513900. Local number, 96. LOCATION.--Lat 18004'15", 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 0, cased 0-10 ft (0-3.05 0, diameter 6 in (0.15 m), cased about 0-183 ft (0-55.79 0, perforated 56-81 ft (17.07-24.70 m), 102-123 ft (31.10-37.50 0, 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 0 above mean sea level, from topographic map. Measuring point: Top of shelter floor, 4.00 ft (1.22 0 above land-surface. REMARKS.--Observation recording well. PERIOD OF RECORD.--April 25, 1978 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 15.38 ft (4.08 m) below land-surface datum, Dec. 9, 1984; lowest water level recorded, 28.29 ft (8.62 below land-surface datum, Sept. 20, 1980. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 20.96 17.22 15.19 16.09 18.70 19.87 --- 18.30 16.19 17.73 18.01 19.53 2 21.06 17.15 15.17 16.15 18.73 19.83 18.21 18.43 16.28 17.75 18.10 19.46 3 21.11 16.80 14.96 15.97 18.72 19.74 18.04 18.55 16.36 17.86 18.14 19.41 4 21.18 16.47 14.80 15.99 18.67 19.60 17.89 18.69 16.48 18.02 18.19 19.35 5 21.30 16.07 14.74 16.15 18.81 19.48 17.76 18.72 16.67 18.15 18.22 19.27 6 21.45 15.66 14.32 16.26 18.88 19.40 17.57 18.66 16.80 18.26 18.24 19.28 7 21.51 15.22 13.93 16.31 19.03 19.36 17.42 18.64 16.89 18.31 18.30 19.36 8 21.43 15.02 13.67 16.32 19.09 19.33 17.44 18.61 17.01 18.29 18.37 19.48 9 21.35 14.91 13.44 16.34 19.17 19.28 17.54 18.67 17.10 18.29 18.45 19.60 10 21.19 14.83 13.49 16.42 19.24 19.18 17.66 18.76 17.17 18.29 18.52 19.66 11 21.05 14.77 13.83 16.50 19.29 19.05 17.58 18.89 17.26 18.32 18.60 19.70 12 20.87 14.75 13.98 16.66 19.36 18.92 17.46 19.05 17.38 18.43 18.66 19.74 13 20.58 14.79 14.15 16.83 19.42 18.78 17.40 19.17 17.47 18.61 18.75 19.66 14 20.09 14.93 14.47 16.99 19.45 18.70 17.32 19.24 17.53 18.76 18.86 19.46 15 19.71 15.08 14.76 17.10 19.42 18.71 17.27 19.30 17.59 18.82 18.98 19.24 16 19.26 15.14 14.98 17.12 19.38 18.75 17.26 19.25 17.63 18.72 19.11 19.03 17 18.84 15.14 15.09 17.25 19.40 18.72 17.26 19.12 17.61 18.57 19.31 18.87 18 18.48 15.07 15.15 17.36 19.46 18.62 17.29 18.85 17.60 18.39 19.48 18.75 19 18.32 14.99 15.25 17.53 19.56 18.53 17.35 18.41 17.59 18.23 19.61 18.65 20 18.32 14.98 15.34 17.74 19.65 18.47 17.45 17.99 17.53 18.13 19.68 18.59 21 18.19 15.19 15.44 17.91 19.72 18.40 17.48 17.59 17.47 18.04 19.68 18.52 22 18.01 15.33 15.56 18.02 19.79 18.41 17.49 17.28 17.48 17.91 19.62 18.43 23 17.80 15.41 15.66 18.07 19.81 18.47 17.51 17.08 17.55 17.79 19.61 18.36 24 17.66 15.41 15.71 18.07 19.88 18.52 17.45 16.91 17.63 17.68 19.69 18.25 25 17.59 15.37 15.77 18.06 19.92 18.60 17.35 16.73 17.73 17.66 19.83 18.04 26 17.48 15.25 15.79 18.10 19.93 18.61 17.40 16.55 17.78 17.70 19.94 17.87 27 17.44 15.17 15.83 18.16 19.95 18.59 17.63 16.38 17.85 17.72 20.02 17.71 28 17.16 15.15 15.72 18.23 19.92 --- 17.88 16.23 17.83 17.74 19.95 17.50 29 16.64 15.19 15.71 18.33 --- 18.07 16.13 17.79 17.74 19.83 17.26 30 16.73 15.20 15.89 18.43 18.19 16.09 17.75 17.79 19.72 17.02 31 17.11 --- 16.01 18.55 --- 16.11 --- 17.90 19.63 --- LOW 21.51 17.22 16.01 18.55 19.95 19.87 18.21 19.30 17.85 18.82 20.02 19.74 HIGH 16.64 14.75 13.44 15.97 18.67 18.40 17.26 16.09 16.19 17.66 18.01 17.02 WTR YR 1985 MEAN 17.83 LOW 21.51 HIGH 13.44 ONDJFMAMJJASOND JFMAMJJASOND JFMAMJJASONDJFMAMJJAS 1981 1982 1983 1984 1985 I I I I I I I I I I 344 GROUND-WATER LEVELS RIO HUMACAO TO RIO SECO BASINS 180026065544300. Local number, 122. LOCATION.--Lat 18000'26", long 65°54'43". Owner: P.R. Aqueduct and Sewer Authority. Name: Maunabo Calsada. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled exploration well, diameter 4 in (0.10 ). Depth 70 ft (21.3 a). DATUM.--Elevation of land-surface datum is about 28.6 ft (8.7 ) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 1.4 ft (0.43 ) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping nearby well. PERIOD OF RECORD.--December 1971 to March 4, 1986, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 2.24 ft (0.68 ) below land-surface datum, July 8, 1976; lowest water level measured, 12.38 ft (3.77 ) below-land surface datum, Aug. 12, 1977. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 19 6.10 Dec. 12 07.69 Feb. 12 c9.73 Mar. 4 c9.32 Nov. 21 07.11 Jan. 16 (38.91 180010066004500. Local number, 125. LOCATION.--Lat 18000'10", long 66000'45". Owner: P.R. Aqueduct and Sewer Authority. Name: Patillas STP. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 16 in (0.41 m), cased 0-45 ft (0-13.7 m), cased 12 in (0.30 ) 0-49 ft (0-14.9 ); perforated 49-81 ft (14.9 -24.7 m). Depth 90 ft (27.4 a). DATUM.--Elevation of land-surface datum is about 48 ft (14.6 ) above mean sea level, from topographic mop. Measuring point: Bottom edge of 0.75 in (0.02 a) pipe in concrete pump base 1.0 ft (0.30 a) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping nearby well. PERIOD OF RECORD.--January 1976 December 12, 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 12.83 ft (3.91 ) below land-surface datum, June 17, 1981; lowest water level measured, a52.98 ft (a16.15 ) below land-surface datum, May 24, 1979. WATER LEVEL, IN FRET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 24 a47.62 Nov. 21 a51.04 Dec. 12 a48.65 a Pumping. c Pumping nearby well. 345 14 GROUND-WATER LEVELS RIO HUMACAO TO RIO SECO BASIN 180850065493700. Local number, 172. LOCATION.--Lat 18°08'50", long 65049'37". Owner: U.S. Geological Survey, City of Humacao. Name: Rio Humacao Ground-Water Station. AQUIFER.--Alluvium. WELL CHARACTERISTICS.--Test well drilled by USGS, diameter 4-2 in (0.10-0.05 m), cased 4 in (0.10 m) 0-40 ft (0-12.20 m), 2 in (0.05 m) 40-43 ft (12.20-13.11 m), 2 in (0.05 • slotted PVC screen 40-43 ft (12.20-13.11 m), 2 in (0.05 m) slotted PVC screen 40-43 ft (12.20-13.11 m). Depth 43 ft (13.11 m). DATUM.--Elevation of land-surface datum is about 57.4 ft (17.50 m) above mean sea level, from topographic map. Measuring point: Mark on shelf of gage house, 3.30 ft (1.01 a) above land surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--November 1983 to June 28, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 13.70 ft (4.18 m) below land-surface datum, May 22, 1984; lowest water level measured 18.22 ft (5.55 m) below land-surface datum, May 9, 11, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 16.87 17.05 17.28 17.63 17.89 17.69 17.56 17.96 17.37 2 16.93 16.93 17.25 17.58 17.90 17.77 17.61 17.98 17.42 3 16.88 15.95 17.22 17.63 17.92 17.69 17.66 17.92 17.45 4 16.95 16.26 17.28 17.58 17.93 17.78 17.71 17.94 17.47 5 17.00 15.42 17.30 17.63 17.94 17.83 17.73 17.97 17.51 6 16.90 15.12 17.35 17.65 17.95 17.82 17.74 18.01 17.54 7 16.88 15.68 17.38 17.66 17.95 17.63 17.76 18.04 17.56 8 16.91 16.03 17.40 17.69 17.96 17.60 17.75 18.07 17.58 9 16.60 16.24 17.42 17.72 17.96 17.67 17.79 18.02 17.60 10 16.35 16.37 17.40 17.73 17.96 17.75 17.84 18.04 17.61 11 16.64 16.50 17.44 17.71 17.98 17.82 17.84 17.94 17.64 12 16.76 16.60 17.38 17.73 18.00 17.85 17.85 17.94 17.66 13 16.83 16.67 17.42 17.74 18.01 17.87 17.85 17.87 17.66 14 15.93 16.73 17.45 17.77 17.98 17.88 17.87 --- 17.68 15 16.33 16.70 17.47 17.78 17.93 17.90 17.88 17.69 16 16.54 16.80 17.48 17.79 17.96 17.92 17.87 17.72 17 16.56 16.86 17.49 17.79 17.98 17.91 17.89 --- 17.75 18 16.68 16.91 17.54 17.80 17.97 17.70 17.91 17.41 17.78 19 16.75 16.96 17.55 17.80 17.91 17.80 17.91 16.30 17.79 20 16.84 17.02 17.57 17.81 17.83 17.86 17.94 16.71 17.81 21 16.91 17.08 17.57 17.84 17.91 17.89 17.94 16.77 17.84 22 16.94 17.11 17.59 17.84 17.94 17.91 17.96 15.18 17.86 23 16.97 17.07 17.59 17.86 17.96 17.93 17.97 16.46 17.88 24 17.03 17.17 17.60 17.86 17.96 17.93 17.70 16.74 17.90 25 17.02 17.07 17.58 17.87 17.94 17.95 17.58 16.93 17.91 26 16.96 16.99 17.57 17.85 17.93 17.94 17.65 17.01 17.93 27 17.03 17.12 17.60 17.86 17.77 17.91 17.76 17.06 17.94 28 17.08 17.18 17.61 17.88 17.48 17.95 17.82 17.13 17.95 29 17.08 17.23 17.63 17.89 --- 17.02 17.87 17.20 --- 30 17.11 17.25 17.56 17.89 17.37 17.92 17.25 31 17.16 --- 17.60 17.92 17.43 --- 17.31 LOW 17.16 17.25 17.63 17.73 18.01 17.95 17.97 18.07 17.95 HIGH 16.56 15.12 17.22 17.58 17.48 17.02 17.56 15.18 17.37 WTR YR 1985 MEAN 17.39 LOW 18.07 HIGH 15.12 DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY 1983 1984 1985 20 I I I I I I I I I I I I I I I I I I I I I I I I I I 346 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 175659066156300. Local number, 1. LOCATION.--Lat 17056'59", long 66°15'53". Owner: P.R. Aqueduct and Sewer Authority. Name: Mar Negro. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Bored unused artesian well, diameter 3 in (0.08 ). Depth 23 ft (7.0 ). DATUM.--Elevation of land-surface datum is about 3 ft (0.91 ) above mean sea level, fro topographic map. Measureing point: Top of 1.5 in (0.04 ) pipe fitting, 3.2 ft (0.98 ) above land-surface datum. REMARKS.--Observation well. Water levels affected by nearby pumping well. PERIOD OF RECORD.--September 1969 to December 11, 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, +2.12 ft (+0.65 ) above land-surface datum, Oct. 18, 1984; lowest water level measured, 3.60 ft (1.10 ) below land-surface datum, July 7, 1977. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 18 +2.12 Nov. 16 +0.65 Dec. 11 +0.97 175861066174600. Local number, 8. LOCATION.--Lat 17058'51", long 660 17'46". Owner: P.R. Aqueduct and Sewer Authority. Name: Salinas 1. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 16 to 13 in (0.41-0.33 a); cased 16 in (0.41 ) 0-32 ft (0-9.8 ), 13 in (0.33 ) 25-120 ft (7.6-36.6 m); perforated 25-120 ft (7.6-36.6 a). Depth 125 ft (38.1 ). DATUM.--Elevation of land-surface datum is about 29 ft (8.8 ) above mean sea level, from topographic map. Measuring point: Top of 1.0 in (0.02 ) pipe in pump base, 1.2 ft (0.37 ) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.--September 1959 to March 7, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 11.95 ft (3.64 ) below land-surface datum, Dec. 14, 1960; lowest water measured, 42.95 ft (13.09 ) below land-surface datum, Dec. 9, 1975. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 18 a23.42 Deo. 11 a21.15 Feb. 20 a21.77 Mar. 7 a25.27 Nov. 16 a21.42 Jan. 29 a27.29 180044066153500. Local number, 18. LOCATION.--Lat 18°00'44", long 66015'35". Owner: P.R. Aqueduct and Sewer Authority. Name: Cocos. AQUIFER.--Alluvium of Quaternary Age and undifferentiated rocks of Cretaceous Age. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 16 to 12 in (0.41 to 0.30 m), cased 16 in (0.41 ) 0-40 ft (0-12-2 ), 12 in (0.30 ) 0-63 ft (0-16.2 ), perforated 32-53 (9.8-16.2 ). Depth 125 ft (38.1 ). DATUM.--Elevation of land-surface datum is about 140 ft (42.7 ) above mean sea level, from topographic map. Measuring point: Top of 1.0 in (0.02 a) pipe in pump base, 1.25 ft (0.38 ) above land-surface datum. REMARKS.--Observation well. Water levels affected by nearby pumpage. PERIOD OF RECORD.--September 1959 to March 7, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 14.67 ft (4.47 m) below land-surface datum, Sept. 20, 1960; lowest water level measured, 79.17 ft (24.13 ) below land-surface datum, June 19, 1968. WATER LEVEL, IN FEET BELOW LAND SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Dale level Date level Data level 19.47 Nov. 23 18.66 Jan. 29 17.59 Oct. 18 25.04 Dec. 11 17.15 Feb. 20 19.06 Mar. 7 + Above land-surface datum. a Pumping. c Pumping nearby well. I I I I I I I I I I GROUND-WATER LEVELS R10 SALINAS TO RIO JACAGUAS BASINS 180023066175400. Local number, 19. LOCATION.--Lat 18000'23", long 66°17'54". Owner: U.S. Army. Name: Theater 1. AQUIFER.--Volcanic rocks of Cretaceous Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 16 to 11 in (0.41 to 0.28 m), cased 16 in (0.41 m) 0-64 ft (0-19.5 a), 11 in (0.28 ) 0-80 ft (0-24.4 a), perforated 16-64 ft (4.9-19.5 ). Depth 150 ft (45.7 ) reported, 86 ft (26.2 ) measured. DATUM.--Elevation of land-surface datum is about 140 ft (42.7 ) above mean sea level, fro topographic map. Measuring point: Top of 1.0 in (0.02 ) casing liner, 0.85 ft (0.26 ) above land-surface datum. After Apr. 8, 1983, top of 4.0 in (0.10 ) flat asp on new concrete slab, 3.6 ft (1.10 ) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--December 1958 to December 11, 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 39.38 ft (12.00 a) below land-surface datum, Oct. 15, 1979; lowest water level measured, 79.15 ft (24.12 m) below land-surface datum, Oct. 10, 1973. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 18 49.02 Nov. 23 46.85 Dec. 11 41.35 347 VN4 348 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 175829066232200. Local number, 87. LOCATION.--Lat 17°68'29", 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), iron 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 s) below land-surface datum, Dec. 10, 1970; lowest water level recorded, 49.18 ft (14.99 n) below land-surface datum, July 27, 1974. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 28.39 26.14 22.16 23.04 23.51 22.37 24.46 23.72 24.68 23.47 25.14 23.86 2 28.29 26.28 21.89 23.03 23.30 22.11 24.68 23.78 24.72 23.51 25.13 23.83 3 28.25 26.28 21.90 22.98 23.14 22.21 24.88 23.83 24.72 23.70 25.22 24.03 4 28.17 25.79 22.33 22.91 23.01 22.36 25.01 23.83 24.74 23.58 25.13 24.16 5 28.17 25.22 22.52 23.04 23.16 22.38 25.04 23.93 24.75 23.44 24.85 24.28 6 28.10 24.54 22.61 23.10 23.39 22.16 26.04 23.84 24.83 23.70 24.77 23.87 7 27.93 24.26 21.88 23.05 23.41 22.38 25.13 23.87 24.75 23.66 24.58 23.88 8 27.79 24.16 21.21 23.11 23.62 22.43 25.16 23.97 24.70 23.75 24.24 24.07 9 27.60 24.33 21.23 23.43 23.74 22.52 25.39 24.06 24.65 24.00 23.63 24.18 10 27.38 24.22 21.08 23.67 23.60 21.89 25.31 24.05 24.64 24.17 23.48 24.46 11 27.24 24.24 20.92 23.57 23.70 22.19 25.46 24.05 24.66 24.28 22.91 24.59 12 27.08 24.40 20.86 23.27 23.61 22.52 25.50 24.18 24.58 24.27 22.42 24.72 13 27.06 24.33 21.22 23.29 23.60 22.90 25.55 24.14 24.65 24.40 22.96 24.27 14 27.12 24.23 21.19 23.33 23.24 23.26 25.45 24.43 24.56 24.21 23.18 23.81 15 27.09 23.94 20.66 23.32 22.56 23.71 25.69 24.55 24.58 24.25 23.46 23.52 16 27.12 23.65 20.92 23.49 22.74 23.89 25.68 24.57 24.42 24.40 23.61 23.35 17 27.13 23.48 21.14 23.46 22.38 23.75 25.65 24.44 24.41 24.43 23.79 23.33 18 27.13 23.32 20.94 23.54 22.03 23.65 25.69 24.42 24.53 24.52 23.99 23.18 19 27.11 23.22 20.95 23.48 21.88 23.66 25.55 24.07 24.42 24.49 24.14 23.31 20 27.17 23.24 21.00 23.57 21.87 23.79 25.58 23.99 24.21 24.54 24.21 23.43 21 27.17 23.27 21.46 23.50 22.46 23.99 25.39 24.09 24.19 24.30 24.07 23.55 22 27.22 23.30 21.83 23.62 22.64 24.14 24.96 24.11 23.77 24.31 24.00 23.63 23 27.26 23.32 22.07 23.75 21.86 24.24 24.92 24.09 23.28 24.54 23.97 23.78 24 27.37 23.39 22.30 23.82 20.98 24.32 24.50 24.11 23.01 24.66 23.96 23.80 25 27.28 23.42 22.46 23.81 20.62 24.23 24.15 24.15 22.80 24.60 23.95 23.93 26 27.01 23.34 22.52 23.88 21.59 24.38 24.09 24.19 23.15 24.69 24.11 23.91 27 26.81 23.27 22.75 23.69 22.01 24.70 24.12 24.17 23.53 24.77 24.29 23.99 28 26.80 23.15 22.78 23.73 22.33 24.92 24.09 24.18 23.54 24.69 24.29 23.97 29 26.80 23.01 22.89 23.75 --- 24.92 23.85 24.18 23.54 24.75 24.21 23.96 30 26.53 22.59 22.99 23.76 24.91 23.73 24.55 23.50 24.94 24.15 23.96 31 26.12 --- 22.98 23.68 24.73 --- 24.63 --- 25.05 23.97 --- LOW 28.39 26.28 22.99 23.88 23.74 24.92 25.69 24.63 24.83 25.05 25.22 24.72 HIGH 26.12 22.59 20.66 22.91 20.62 21.89 23.73 23.72 22.80 23.44 22.42 23.18 WTR YR 1985 MEAN 24.03 LOW 28.39 HIGH 20.62 20 3 0 24 1--"t w0 La w 28 Ct -J LAJ > W I -J Ci oc_?„. 32 < 36 ASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 1981 1982 1983 1984 1985 I I I I I I I I I I I I I I I I I I I I GROUND-WATER LEVELS 349 RIO SALINAS TO RIO JACAGUAS BASINS 180052066305000. Local number, 88. LOCATION.--Lat 18.00'52", long 66030'50". Owner: Luce and Co. Name: Hacienda Potala. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 19 in (0.48 m). Depth 143 ft (43.6 ). DATUM.--Elevation of land-surface datum is about 42.65 ft (13 ) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 2.20 ft (0.67 ) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumpage of nearby well. Station discontinued, Jan. 1, 1973. Reactivated, Apr. 15, 1976. PERIOD OF RECORD.--May 1968, January 1973; April 1976 to March 7, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 4.50 ft (1.37 ) below land-surface datum; Feb. 26, 1971; lowest water level measured, 37.89 ft (11.55 ) below land-surface datum, July 16, 1968. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 18 18.91 Deo. 10 c14.17 Feb. 19 c23.55 Mar. 7 18.52 Nov. 26 c22.02 Jan. 29 o24.17 175822066134800. Local number, 124. LOCATION.--Lat 17°58'22", long 66°13'48". Owner: P.R. Aqueduct and Sewer Authority. Name: Coqui 2. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 16 to 12 in (0.40 to 0.30 ), cased 16 in (0.40 ) 20-40 ft (6.1-12.2 ), 12 in (0.30 a) 2-20 ft (0.61-6.1 ); perforated 20-118 ft (6.1-36.0 s). Depth 118 ft (36.0 ). DATUM.--Elevation of land-surface datum is about 26 ft (7.9 a) above mean sea level, fro topographic map. Measuring point: Airline hole in pump base, 2.2 ft (0.67 ) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--April 24, 1975 to March 7, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, a9.25 ft (a2.82 ) below land-surface datum, Nov. 29, 1979; lowest water level measured, a54.70 ft (a16.67 ) below land-surface datum, July 7, 1977. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 18 al1.41 Dec. 11 al0.04 Feb. 20 a39.57 Mar. 7 a37.01 Nov. 16 al0.31 Jan. 29 a21.60 175750066225800. Local number, 144. LOCATION.--Lat 17057'50", long 66022'58". Owner: P.R. Aqueduct and Sewer Authority. Name: Jauca south well, site 1. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Driiled unused water-table well, diameter 8 in (0.20 ), cased 0-50 ft (0-15.2 ), perforated 45-50 ft (13.7-15.2 ). Depth 60 ft (15.2 a). DATUM.--Altitude of land-surface datum is 15.98 ft (4.87 ) above mean sea level. Measuring Point: Hole side of 8 in (0.20 m) casing, 3.2 ft (0.98 ) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1980 to March 7, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 8.86 ft (2.70 a) below land-surface datum, Dec. 10, 1984; lowest water level measured, 11.90 ft (3.63 ) below land-surface datum, Feb. 9, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 18 9.76 Dec. 10 8.86 Feb. 19 9.58 Mar. 7 9.68 Nov. 26 9.14 Jan. 29 9.54 a Pumping. c Pumping nearby well. I I I I I I I I I I I I I I I I I I I I I 350 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 175750066225801. Local number, 145. LOCATION.--Lat 17°57'50", long 66°22'58". Owner: P.R. Aqueduct and Sewer Authority. Name: Jauca north well, site 1. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 8 in (0.20 m), cased 0-250 ft (0-76.2 ), perforated 245-250 ft (74.7-76.2 ). Depth 250 ft (76.2 a). DATUM.--Elevation of land-surface datum is 16.11 ft (4.91 ) above mean sea level. Measuring point: Hole aide of 8 in (0.20 ) casing, 1.5 ft (0.46 ) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1980 to March 7, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 9.09 ft (2.77 ) below land-surface datum, Dec. 10, 1984; lowest water level measured, 13.23 ft (4.03 ) below land-surface datum, Jan. 6, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 18 10.48 Dec. 10 9.09 Feb. 19 9.68 Mar. 7 9.92 Nov. 26 10.05 Jan. 29 9.72 175734066233300. Local number, 146. LOCATION.--Lat 17°57'34", long 66°23'33". Owner: P.R. Aqueduct and Sewer Authority. Name: Hacienda Alone!' west well, site 3. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 8 in (0.20 ), cased 0-70 ft (0-21.3 ), perforated 65-70 ft (19.8-21.3 ). Depth 70 ft (21.3 ). DATUM.--Elevation of land-surface datum is 18.74 ft (5.71 ) above mean sea level. Measuring point: Hole side of 8 in (0.20 ) casing, 2.5 ft (0.76 ) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--June 1981 to March 7, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 7.43 ft (2.26 a) below land-surface datum, Oct. 18, 1984; lowest water level measured, 12.49 ft (3.81 ) below land-surface datum, Aug. 17, 1981. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 18 7.43 Dec. 10 8.96 Feb. 19 9.29 Mar. 7 8.37 Nov. 23 8.78 Jan. 29 9.22 175734066233301. Local number, 147. LOCATION.--Lat 17°57'34", long 66°23'33". Owner: P.R. Aqueduct and Sewer Authority. Name: Hacienda Alomar east well, site 3. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 8 in (0.20 ), cased 0-250 ft (0-76.2 ), perforated 245-250 ft (74.7-76.2 m). Depth 250 ft (76.2 m). DATUM.--Elevation of land-surface datum is 18.80 ft (5.73 ) above mean sea level. Measuring point: Top of 8 in (0.20 ) casing, 3.60 ft (1.10 a) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--June 1981 to March 7, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 12.48 ft (3.80 ) below land-surface datum, Oct. 18, 1984; lowest water level measured, 15.05 ft (4.59 ) below land-surface datum, Aug. 7, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 18 12.48 Dec. 10 12.94 Feb. 19 13.49 Mar. 7 13.30 Nov. 23 12.88 Jan. 29 13.33 I GROUND-WATER LEVELS 351 RIO SALINAS TO RIO JACAGUAS BASINS 175756066244000. Local number, 148. LOCATION.--Lat 17°57'56", long 66°24'40". Owner: P.R. Aqueduct and Sewer Authority. Name: Playa Santa Isabel east well, site 2. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 8 in (0.20 m), cased 0-250 ft (0-76 2 m), diameter 2 in (0.05 a), cased 0-200 ft (0-61.0 it), perforated 195-200 ft (59.4-61.0 m), concreted 200-250 ft (61.0-76.2 m). Depth 200 ft (61.0 m). DATUM.--Elevation of land-surface datum is 21.20 ft (6.46 m) above mean sea level. Measuring point: Hole side of 8 in (0.20 a) casing, 2.8 ft (0.85 a) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--January 1981 to March 7, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 12.82 ft (3.91 ) below land-surface datum, Dec. 23, 1981; lowest water level measured, 29.45 (8.98 a) below land-surface datum, Jan. 13, 1981. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 18 16.55 Dec. 10 14.00 Feb. 19 14.79 Mar. 7 14.81 Nov. 23 15.91 Jan. 29 14.45 175756066244001. Local number, 149. LOCATION.--Lat 17°57'56", long 66°24'40". Owner: P.R. Aqueduct and Sewer Authority. Name: Playa Santa Isabel west well, site 2. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 8 in (0.20 m), cased 0-250 ft (0-76.2 m), diameter 2 in (0.05 m), cased 0-250 ft (0-76.2 m), perforated 245-250 ft (74.7-76.2 m), concreted 200-250 ft (61.0-76.2 m). Depth 250 ft (76.2 m). DATUM.--Elevation of land-surface datum is 21.20 ft (6.46 m) above mean sea level, from topographic map. Measuring point: Hole side of 8 in (0.20 m) casing, 2.8 ft (0.85 a) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--January 1981 to March 7, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 11.20 ft (3.41 m) below land-surface, Dec. 10, 1984; lowest water level measured, 26.92 ft (8.21 m) below land-surface datum, Jan. 13, 1981. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 18 14.23 Dec. 10 11.20 Feb. 19 12.34 Mar. 7 13.02 Nov. 23 12.46 Jan. 29 13.12 I I 352 GROUND-WATER LEVELS RIO INABON TO RIO LOCO BASINS 175922066495800. Local number, 16. LOCATION.--Lat 17°59'22", long 66°49'58". Owner: Sucesion Lluveras. Name: Central San Francisco. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused artesian well, diameter 20 in (0.51 ). Depth 185 ft (56.4). DATUM.--Elevation of land-surface datum is about 30 ft (9.1 a) above mean sea level, from topographic map. Measuring point: Top of shelter's wooden base, 4.06 ft (1.24 m) above land-surface datum. REMARKS.--Recording observation well (Nov. 9, 1960 to Mar. 23, 1965). Water levels affected by pumpage of nearby wells. PERIOD OF RECORD.--November 1960 to March 5, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 0.35 ft (0.11 m) below land-surface datum, Oct. 15, 1984; lowest water level measured, 35.76 ft (10.90 m) below land-surface datum, Mar. 7, 1975. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 15 0.35 Dec. 6 4.68 Feb. 14 6.18 Mar. 5 7.39 Nov. 23 4.49 Jan. 22 6.80 180057066361000. Local number, 21. LOCATION.--Lat 18°00'57", long 66°36'11". Owner: P.R. Aqueduct and Sewer Authority. Name: Alhambra. AQUIFER.--Ponce Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled public supply artesian well, diameter 20 in (0.51 m), cased 0-300 ft (0-91.4 m), perforated 80-300 ft (24.4-91.4 m). Depth 300 ft (91.4 m). DATUM.--Elevation of land-surface datum is about 53 ft (16.2 m) above mean sea level, from topographic map. Measuring point: Bottom edge 1.5 in (0.04 m) pipe in concrete pump base, 0.7 ft (0.21 m) below land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--November 1958 to August 10, 1972; January 17, 1975 to March 7, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 17.43 ft (5.31 m) below land-surface datum, Dec. 14, 1960; lowest water level measured, 97.61 ft (29.75 m) below land-surface datum, Aug. 8, 1967. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 17 a81.79 Dec. 5 a79.50 Feb. 14 a87.70 Mar. 7 a84.74 Nov. 23 a76.57 Jan. 22 a85.29 180150066474900. Local number, 27. LOCATION.--Lat 18°01'50", long 66°47'49". Owner: P.R. Aqueduct and Sewer Authority. Name: Quebradas. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 16 to 12 in (0.41 to 0.30 m), cased 16 in (0.41 ) 0-40 ft (0-12.2 m), 12 in (0.30 m) 0-120 ft (0-36.6 m), perforated 40-120 ft (12.2-36.6 a). Depth 120 ft (36.6 m). DATUM.--Elevation of land-surface datum is about. 59 ft (18.0 m) above mean sea level, from topographic map. Measuring point: Top of 1.0 in (0.02 m) pipe in pump base, 1.1 ft (0.34 m) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumpage. PERIOD OF RECORD.--November 1958 to December 7, 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 25.72 ft (7.84 m) below land-surface datum, Oct. 8, 1959; lowest water level measured, 75.1 ft (22.89 is) below land-surface datum, June 27, 1972. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 17 a37.53 Nov. 23 a32.80 Dec. 7 a31.72 a Pumping. GROUND-WATER LEVELS 353 RIO 1NABON TO RIO LOCO BASINS 180110066473500. Local number, 74. LOCATION.--Lat 18°01'10", long 66°47'35". Owner: P.R. Aqueduct and Sewer Authority. Name: Guayanilla. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 16 in (0.41 m), cased 0-103 ft (0-31.4 m), perforated 39-103 ft (11.9-31.4 m). Depth 102 ft (31.1 m). DATUM.--Elevation of land-surface datum is about 34 ft (10.4 m) above mean sea level, from topographic map. Measuring point: Airline hole in pump base, 3.0 ft (0.91 m) above land-surface datum. REMARKS.--Observation well. Drilled to 195 ft (59.44 m), plugged back to 102 ft (31.1 m). PERIOD OF RECORD.--August 1960 to March 5, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 8.56 ft (2.61 a) below land-surface datum, Oct. 21, 1960; lowest water level measured, 90.50 ft (27.58 m) below land-surface datum, Aug. 13, 1976. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 15 a15.68 Dec. 6 al5.25 Feb. 14 a15.20 Mar. 5 a15.53 Nov. 23 a15.44 Jan. 24 a15.60 180058066502700. Local number, 131. LOCATION.--Lat 18°00'58", long 66°50'27". Owner: Union Carbide Corporation. Name: Yauco 1 or UCC 2. AQUIFER.--Alluvium of Quaternary Age and limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled observation well, casing slotted 20-145 ft (6.1-44.2 m), open hole below 145 ft (44.2 m). Depth 156 ft (47.6 a). DATUM.--Elevation of land-surface datum is about 66 ft (20.1 m) above mean sea level, from topographic map. Measuring point: Top of 3 in (0.08 m) pipe, 2.5 ft (0.76 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--August 1972 to December 6, 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 0.46 ft (0.14 m) below land-surface datum; June 14, 1979; lowest water level measured, 44.95 ft (13.70 m) below land-surface datum, May 20, 1974. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 15 11.49 Nov. 23 5.48 Dec. 6 5.38 a Pumping. 354 2 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 a) 0-20 ft (0-6.1 m), 12 in (0.30 m) perforated pipe 20-84 ft (6.1-25.61 a), 10 in (0.25 a) perforated pipe 84-190 ft (25.61-57.93 a). Depth 190 ft (57.93 a). DATUM.--Rlevation of land-surface datum is about 75 ft (22.87 a) 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, +0.12 ft (+0.04 m) below land-surface datum, July 19, 1979; lowest water level, 36.91 ft (11.25 a) below land-surface datum, June 27, 1974. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 8.61 7.49 5.72 6.37 7.12 7.51 7.46 8.33 --- 8.54 8.86 2 8.55 7.56 5.80 6.45 7.03 7.50 7.51 8.38 7.57 8.56 9.06 3 8.50 5.90 5.83 6.60 7.05 7.46 7.55 8.41 7.68 8.64 9.11 4 8.35 3.96 5.88 6.64 7.21 7.44 7.56 8.45 7.75 8.57 9.17 5 8.30 4.01 5.92 6.45 7.15 7.46 7.60 8.48 7.78 8.73 9.26 6 8.21 4.33 5.95 6.45 7.30 7.46 7.67 8.50 7.83 8.79 9.06 7 8.17 4.72 5.98 6.66 7.35 7.51 7.74 8.53 7.87 8.85 8.71 8 8.13 4.95 6.01 6.48 7.27 7.54 7.75 8.56 7.97 8.89 8.50 9 8.03 5.12 6.04 6.66 7.34 7.50 7.78 8.59 8.04 8.89 8.61 10 7.74 5.35 5.78 6.69 7.37 7.48 7.82 8.66 8.12 8.87 8.66 11 7.64 5.40 5.86 6.66 7.53 7.51 7.89 8.71 8.18 8.76 8.66 12 7.62 5.52 5.95 6.53 7.49 7.46 7.91 8.82 8.29 8.85 8.51 13 7.57 5.59 6.02 6.55 7.54 7.47 7.94 8.92 8.38 8.58 8.46 14 7.54 5.67 6.02 6.68 7.56 7.52 7.97 9.02 8.32 8.53 8.24 15 7.54 5.71 6.04 6.70 7.43 7.54 8.04 9.08 8.47 8.58 7.79 16 7.55 6.74 6.06 6.73 7.41 7.66 8.23 8.65 8.34 8.47 7.83 17 7.45 5.81 6.15 6.73 7.38 7.62 8.35 7.34 8.15 8.48 7.87 18 7.45 5.87 6.26 6.76 7.41 7.61 8.39 6.39 8.16 8.55 7.93 19 7.53 5.92 6.29 6.63 7.39 7.62 8.47 --- 8.16 8.62 7.94 20 7.57 5.96 6.29 6.64 7.44 7.63 8.50 8.14 8.74 7.96 21 7.49 5.97 6.33 6.67 7.50 7.61 8.57 8.14 8.73 7.98 22 7.38 6.02 6.22 6.80 7.54 7.62 8.68 8.16 8.76 7.93 23 7.40 6.09 6.23 6.83 7.55 7.65 8.68 8.17 8.87 7.95 24 7.46 6.08 6.25 6.90 7.55 7.68 8.74 8.09 8.82 7.83 25 7.54 6.03 6.27 6.77 7.54 7.72 8.70 8.21 8.83 7.40 26 7.57 5.70 6.39 6.79 7.54 7.77 8.48 8.28 9.02 7.42 27 7.54 5.43 6.41 6.80 7.55 7.67 8.20 8.34 8.96 7.48 28 7.46 6.44 6.47 6.82 7.56 7.68 8.18 8.22 8.78 7.19 29 7.47 5.65 6.36 6.98 --- 7.74 8.36 8.40 8.93 7.31 30 7.53 5.68 6.35 6.94 7.56 8.28 8.46 9.01 7.36 31 7.54 --- 6.41 6.98 7.52 --- 8.50 8.89 --- LOW 8.61 7.56 6.47 6.98 7.56 7.77 8.74 9.08 8.50 9.02 9.26 HIGH 7.38 3.96 5.72 6.37 7.03 7.44 7.46 6.39 7.57 8.47 7.19 WTR YR 1985 MEAN 7.49 LOW 9.26 HIGH 3.96 SONDJFMAMJ JASONDJFMAMJJ ASONDJFMAM J J ASONDJFMAMJJ AS 1981 1982 1983 1984 1985 18 I I GROUND-WATER LEVELS RIO 1NABON TO RIO LOCO BASINS 180120066503200. Local number, 134. LOCATION.--Lat 18°01'20", long 66°50'32". Owner: Union Carbide Corporation. Name: Yauco 4 or UCC 1. AQUIFER.--Alluvium of Quaternary Age and limestone of Tertiary Age. WELL CBARACTERISTICS.--Drilled observation well, casing slotted 20-140 ft (6.1-42.7 m) open hole 140-163 ft (42.7-49.7 ). Depth 163 ft (49.7 m). DATUM.--Elevation of land-surface datum is about 87 Et (26.5 m) above mean sea level, from topographic map. Measuring point: Top of 3 in (0.08 m) pipe, 3.4 ft (1.04 ) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--July 1972 to December 6, 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Higheat water level measured, 7.90 ft (2.41 m) below land-surface datum; June 14, 1979; lowest water level measured, 37.84 ft (11.53 a) below land-surface datum, June 27, 1974. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 15 14.60 Nov. 23 10.59 Dec. 6 10.46 355 356 11 GROUND-WATER LEVELS RIO 1NABON 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 a), 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 a). 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 current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level, 15.65 ft (4.77 m) below land-surface datum, Aug. 30, 1983; lowest water level, 28.59 ft (8.714 m) below land-surface datum, July 9, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 16.61 17.04 13.05 15.46 16.53 16.74 17.50 20.70 17.72 16.28 16.38 18.80 2 16.68 15.70 13.05 15.41 16.65 16.59 18.05 20.76 17.53 16.34 16.43 18.74 3 16.84 13.56 13.06 15.50 16.09 16.97 17.29 20.81 18.23 16.40 16.48 16.68 4 16.93 13.45 13.14 15.42 16.51 17.09 17.34 20.84 17.71 16.47 16.50 16.42 6 17.10 12.79 13.23 15.19 16.66 17.20 17.22 20.82 17.63 16.46 16.55 16.32 6 17.23 12.10 13.32 15.49 16.18 17.26 17.27 20.78 17.12 16.43 16.52 15.90 7 17.27 11.77 13.36 15.58 16.07 16.62 17.27 20.77 17.36 16.38 16.63 15.43 8 15.89 11.71 13.40 15.69 15.88 16.19 18.26 20.76 17.30 16.35 16.69 15.55 9 15.92 11.72 13.39 15.84 16.63 15.97 18.81 20.74 16.50 16.43 16.47 15.46 10 15.96 11.79 13.36 15.95 16.72 15.78 18.54 20.72 16.89 16.50 16.62 15.41 11 15.99 12.21 13.43 16.01 16.14 15.81 18.50 20.68 16.99 16.55 16.60 15.41 12 16.03 11.60 13.52 16.14 15.99 15.81 18.54 20.59 15.09 16.58 16.58 15.49 13 16.06 12.19 13.61 16.17 15.91 15.81 19.19 20.49 15.47 16.60 16.52 14.66 14 16.10 12.29 13.67 16.20 16.05 15.97 19.32 19.85 15.65 16.55 16.58 14.17 15 16.13 12.44 13.70 16.26 16.02 15.82 19.45 19.32 15.75 16.41 16.58 13.87 16 16.17 12.55 13.68 16.17 15.96 16.42 19.64 18.95 15.57 16.38 16.43 13.74 17 16.20 12.68 13.67 15.52 15.91 16.57 19.82 18.65 15.64 16.42 16.56 13.66 18 16.47 12.75 13.75 16.05 15.87 16.37 19.92 17.53 16.07 16.48 16.56 13.63 19 16.65 12.83 13.83 16.30 15.89 15.86 20.11 17.48 16.29 17.45 16.39 13.48 20 16.70 12.77 13.90 16.39 15.88 15.92 20.25 17.19 16.39 15.82 16.50 14.19 21 16.65 13.61 14.03 16.43 15.90 16.42 20.29 17.28 16.45 16.05 16.59 14.06 22 16.55 13.26 14.25 15.87 15.94 16.64 19.90 17.28 15.78 16.02 16.61 13.71 23 16.58 13.10 14.84 16.32 15.96 16.78 20.27 17.34 16.08 16.00 16.67 13.85 24 16.76 13.08 15.04 15.97 15.93 16.84 20.37 17.49 16.04 16.07 16.70 14.04 25 16.83 13.03 15.13 16.34 15.92 16.90 20.43 17.48 16.07 16.15 16.66 14.04 26 16.90 13.06 15.18 16.48 15.88 15.80 18.96 17.37 16.13 16.14 16.62 13.97 27 16.97 12.92 15.27 16.51 15.88 16.06 20.17 17.33 16.19 16.09 18.46 14.20 28 16.93 12.91 15.34 16.52 15.93 15.51 20.30 17.52 16.30 16.10 18.42 14.27 29 16.89 12.96 15.25 16.43 --- 16.05 20.38 17.54 16.34 16.16 16.49 14.88 30 16.96 13.01 15.38 15.78 18.15 20.64 17.74 16.32 16.27 17.43 14.65 31 17.03 --- 15.43 16.36 17.53 --- 17.83 --- 16.35 18.78 --- LOW 17.27 17.04 15.43 16.52 16.72 18.15 20.64 20.84 18.23 17.46 18.78 18.80 HIGH 15.89 11.60 13.05 15.19 15.87 15.51 17.22 17.19 15.09 15.82 16.38 13.48 WTR YR 1985 MEAN 16.24 HIGH 11.60 LOW 20.84 ONDJFMAMJJASONDJFMAMJJ ASONDJFMAMJJ ASON DJ FMAMJJ A S 1981 1982 1983 1984 1985 31 I I I GROUND-WATER LEVELS 357 RIO GUANAJIBO BASIN 180934067050800. Local number, 40. LOCATION.--Lat 18°09'34", long 67°05'08". Owner: P.R. Aqueduct and Sewer Authority. Name: Rosario. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled public supply artesian well, diameter 16 to 12 in (0.41 to 0.30 m), cased 16 in (0.41 a) 0-30 ft(0-9.1 ), cased 12 in (0.30 a) 0-60 ft (0-18.3 a); perforated 10-60 ft (3.0-18.3 ). Depth 105 (32.0 a). DATUM.--Elevation of land-surface datum is about 164 ft (50.0 m) above mean sea level, from topographic map. Measuring point: Lower edge of 0.75 in (0.02 m) pipe, 2.7 ft (0.82 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--July 1960 to November 1971; May 1973; March 1974 to January 17, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 0.20 ft (0.06 ) below land-surface datum, Aug. 3, 1983; lowest water level measured, 37.30 ft (11.37 a) below land-surface datum, May 7, 1973. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 11 11.07 Nov. 16 al3.62 Dec. 19 a13.92 Jan. 17 al0.95 181018067091700. Local number, 43. LOCATION.--Lat 18°10'18", long 67°09'17". Owner: Mayaguez Sugar Co. Name: Central Rochelaise. AQUIFER.--Volcanic rocks of Cretaceous Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 12 in (0.30 m), cased 0-45 ft (0-13.7 m), perforated 0-45 ft (0-13.7 um). Depth 80 ft (24.4 m). DATUM.--Elevation of land-surface datum is about 7 ft (2.1 m) above mean sea level, from topographic map. Measuring point: Top of 12 in (0.30 a) casing, 1.9 ft (0.58 a) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--August 1959 to January 17, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, +0.60 ft (+0.18 m) above land-surface datum, Oct. 10, 1984; lowest water level measured, 2.70 ft (0.82 m) below land-surface datum, Apr. 15, 1970. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 10 +0.60 Nov. 15 +0.57 Dec. 19 +0.57 Jan. 17 +0.40 + Above land-surface datum. a Pumping. 358 GROUND-WATER LHVIILS RIO OUANAJIBO 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 sap. Measuring point: Hole side of casing, 0.80 ft (0.24 a) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--December 1981 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level, 38.00 ft (11.58 m) below land-surface datum, Sept. 19, 20, 1982; lowest water level, 39.70 ft (12.10 m) below land-surface datum, June. 29, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 39.10 38.81 38.50 38.60 38.91 39.10 39.24 39.37 39.27 39.46 39.56 39.59 2 39.09 38.79 38.51 38.61 38.94 39.09 39.24 39.39 39.28 39.48 39.57 39.56 3 39.10 38.75 38.53 38.60 38.95 39.09 39.25 39.39 39.25 39.46 39.56 39.56 4 39.05 38.75 38.54 38.58 38.95 39.10 39.27 39.41 39.23 39.48 39.57 39.56 6 39.05 38.75 38.65 38.61 38.97 39.09 39.26 39.41 39.24 39.50 39.56 39.55 6 39.03 38.75 38.54 38.64 38.95 39.11 39.27 39.41 39.25 39.49 39.54 39.50 7 39.03 38.75 38.53 38.63 38.96 39.14 39.30 39.40 39.26 39.46 39.54 39.49 8 39.00 38.75 38.63 38.64 38.95 39.16 39.29 39.41 39.27 39.45 39.54 39.46 9 38.99 38.73 38.51 38.66 38.95 39.19 39.25 39.43 39.27 39.44 39.54 39.47 10 38.98 38.73 38.47 38.68 38.96 39.16 39.26 39.43 39.31 39.48 39.56 39.47 11 39.00 38.73 38.45 38.65 38.98 39.15 39.29 39.40 39.33 39.49 39.56 39.47 12 39.00 38.73 38.46 38.63 38.95 39.15 39.32 39.41 39.32 39.49 39.54 39.45 13 38.96 38.73 38.49 38.66 38.97 39.16 39.31 39.43 39.34 39.51 39.54 39.47 14 38.94 38.73 38.49 38.73 38.99 39.17 39.31 39.44 39.34 39.51 39.56 39.43 15 38.95 38.74 38.46 38.73 38.98 39.18 39.30 39.42 39.35 39.48 39.56 39.41 16 38.96 38.74 38.43 38.74 39.01 39.21 39.31 39.37 39.36 39.53 39.57 39.38 17 38.96 38.46 38.43 38.73 39.04 39.20 39.32 39.33 39.38 39.53 39.56 39.38 18 38.93 38.47 38.49 38.73 39.06 39.19 39.33 39.35 39.38 39.54 39.57 39.39 19 38.92 38.49 38.48 38.75 39.05 39.20 39.33 39.35 39.34 39.53 39.58 39.37 20 38.94 38.50 38.50 38.77 39.06 39.21 39.33 39.35 39.33 39.50 39.57 39.37 21 38.94 38.50 38.62 38.79 39.07 39.20 39.29 39.34 39.35 39.50 39.56 39.37 22 38.91 38.49 38.52 38.80 39.09 39.23 39.29 39.32 39.37 39.52 39.58 39.35 23 38.86 38.47 38.50 38.81 39.06 39.23 39.28 39.31 39.36 39.48 39.58 39.30 24 38.85 38.47 38.50 38.84 39.06 39.23 39.27 39.30 39.36 39.50 39.58 39.31 25 38.89 38.43 38.54 38.83 39.09 39.21 39.27 39.27 39.34 39.51 39.60 39.33 26 38.88 38.41 38.58 38.84 39.07 39.24 39.30 39.26 39.36 39.52 39.62 39.37 27 38.88 38.45 38.60 38.83 39.08 39.26 39.32 39.25 39.41 39.50 39.60 39.39 28 38.83 38.43 38.60 38.83 39.08 39.24 39.33 39.25 39.42 39.51 39.61 39.39 29 38.80 38.46 38.61 38.85 --- 39.23 39.33 39.26 39.45 39.56 39.61 39.37 30 38.79 38.50 38.61 38.87 39.23 39.35 39.27 39.44 39.57 39.58 39.37 31 38.80 --- 38.60 38.90 39.24 --- 39.28 --- 39.57 39.59 --- Low 39.10 38.81 38.61 38.90 39.09 39.26 39.35 39.44 39.45 39.57 39.62 39.59 HIGH 38.79 38.41 38.43 38.58 38.91 39.09 39.24 39.25 39.23 39.44 39.54 39.30 WTR YR 1985 MEAN 39.12 LOW 39.62 HIGH 38.41 38 40 D JFMAMJ JASOND JFMAMJ JASONDJFMAMJJ ASONDJFMAMJ J AS 1981 1982 1983 1984 1985 I GROUND-WATER LEVELS 359 RIO YAGUEZ AND RIO GRANDE DE ANASCO BASINS 181233067083300. Local number, 45. LOCATION.--Lat 18°12'33", long 67°08'33". Owner: Cerveceria India, Inc. Name: Well 1, Mayaguez. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 12 in (0.30 m), cased 0-82 ft (0-25.0 m). Depth 82 ft (25.0 ). DATUM.--Elevation of land-surface datum is about 23 ft (7.0 m) above mean sea level, from topographic map. Measuring point: Top of wood cover, 0.9 ft (0.27 m) above land-surface datum. REMARKS.--Observation well. Affected by nearby pumping. PERIOD OF RECORD.--October 1960 to January 17, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 9.41 ft (2.87 m) below land-surface datum, Sept. 15, 1977; lowest water level measured, 29.97 ft (9.13 m) below land-surface datum, Jan. 20, 1966. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 10 12.81 Nov. 16 11.83 Dec. 20 13.60 Jan. 17 13.00 181522067090900. Local number, 53. LOCATION.--Lat 18°15'22", long 67°09'09". Owner: P.R. Ports Authority. Name: Mayaguez Airport. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 8 in (0.20 m), cased 0-114 ft (0-34.8 m), perforated 82-114 ft (25.0-34.8 a), open hole 114-353 ft (34.8-107.6 a). Depth 353 ft (107.6 m). DATUM.--Elevation of land-surface datum is about 20 ft (6.1 m) above mean sea level, from topographic map. Measuring point: Slot in pump base, 0.4 ft (0.12 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--October 1960 to October 10, 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 0.96 ft (0.29 a) below land-surface datum, Oct. 5, 1978; lowest water level measured, 8.70 ft (2.65 m) below land-surface datum, Feb. 14, 1979. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATION Water Date level Oct. 10 1.93 I I I 360 GROUND-WATER LEVELS RIO CULEBRINAS BASIN 182228067113300. Local number, 58. LOCATION.--Lat 18°22'38", long 67°11'33". Owner: P.R. Aqueduct and Sewer Authority. Name: Aguada. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled public supply artesian well, diameter 20 to 12 in (0.51-0.30 m), cased 20 in (0.51 ) 0-40 ft (0-12.2 a), 12 in (0.30 ) 0-60 ft (0-18.3 a), perforated 40-60 ft (12.2-18.3 le). Depth 160 ft (48.6 m). DATUM.--Elevation of land-surface datum is about 30 ft (9.1 m) above mean sea level, from topographic map. Measuring point: Lower edge of 0.75 in (.02 m) pipe in pump base, 1.90 ft (0.58 m) above land-surface datum. REMARKS.--Observation well. Piezometric head measured for highest water level. PERIOD OF RECORD.--January 1960 to March 4, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, +0.81 ft (+0.25 m) above land-surface datum, Sept. 12, 1975; lowest water level measured, 83.53 ft (25.46 ) below land-surface datum, Aug. 7, 1974. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 10 0.18 Dec. 20 2.10 Feb. 21 3.35 Mar. 4 3.20 Nov. 15 0.75 Jan. 16 2.49 182032066591800. Local number, 83. LOCATION.--Lat 18°20'32", long 66°59'18". Owner: P.R. Water Resources Authority. Name: San Sebastian. AQUIFER.--Volcanic rock of Eocene Age. WELL CHARACTERISTICS.--Drilled observation well, diameter 6 in (0.15 m). 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: Top of casing, 2.40 ft. (0.73 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--May 1967 to January 16, 1985, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 21.95 ft (6.69 m) below land-surface datum, Apr. 15, 1976; lowest water level measured, 40.20 ft (12.25 m) below land-surface datum, July 21, 1970. WATER LEVEL, [N FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Water Water Water Water Oct. 1 26.77 Nov. 2 27.55 Dec. 20 29.51 Jan. 16 29.93 + Above land-surface datum. Surface- Water Records for U.S. Virgin Islands I I I I 362 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 mi (0.8 km) upstream from Atlantic Ocean, and 2.5 i (4.02 km) northwest of Fort Christian, Charlotte Amalie. DRAINAGE AREA.--0.49 sq i (1.27 sq km). 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. Elevation of gage is 280 ft (85 ), 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 m) upstream at different datum. REMARKS.--No estimated daily discharges during water year. Records poor. AVERAGE DISCHARGE.--7 years (1964-66, 1980, 1983-85), 0.25 cu ft/s (0.007 cu m/s), 6.93 In/yr (176 mm/yr), 181 acre-ft/yr (0.223 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,650 cu ft/s (46.7 cu m/s), Apr. 18, 1983, gage height, 7.00 ft (2.134 m), from floodmarks, from rating curve extended above 1.0 cu ft/s (0.03 cu m/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 cu ft/s (1.42 cu m/s) and maximum (*): Discharge Gage height Discharge Gage height. Date Time (cu ft/s) (Cu m/s) (ft) (1) Date Time (cu ft/s) (cu m/s) (ft) (m) Oct. 18 0100 74 2.10 1.65 0.503 Nov. 7 0630 *1,060 30.0 *5.59 1.704 Nov. 5 1645 578 16.4 4.09 1.247 No flow part of each day, Mar. 25, 26, Aug. 1-3. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .03 .06 1.3 .05 .02 .02 .01 .02 .02 .02 .01 .02 2 .02 .06 .36 .06 .02 .02 .01 .02 .02 .01 .01 .02 3 .01 .11 .22 .05 .03 .02 .01 .01 .03 .01 .01 .03 4 .02 .21 .16 .05 .03 .02 .01 .02 .02 .01 .01 .06 5 .02 53 .13 .05 .02 .02 .01 .03 .02 .01 .01 .06 6 .27 7.2 .11 .13 .03 .03 .02 .04 .02 .01 .02 .04 7 .19 74 .10 .09 .04 .02 .02 .06 .01 .01 .01 .02 8 .07 2.4 .09 .06 .05 .02 .01 .06 .01 .01 .02 .02 9 .06 .95 .08 .06 .05 .02 .02 .06 .01 .01 .02 .02 10 .06 .46 .07 .08 .02 .02 .02 .06 .02 .02 .02 .03 11 .03 .35 .09 .05 .02 .02 .02 .07 .02 .02 .01 .02 12 .03 .24 .07 .05 .03 .02 .03 .07 .01 .01 .02 .14 13 .04 .17 .07 .05 .03 .02 .05 .03 .02 .01 .03 2.5 14 .02 .19 .06 .06 .03 .02 .05 .05 .02 .02 .01 .31 15 .02 .13 .09 .05 .02 .02 .06 .06 .02 .01 .01 .09 16 .05 .13 .14 .05 .03 .02 .03 .06 .02 .03 .01 .05 17 .23 .17 .08 .05 .03 .02 .04 .06 .02 .01 .01 .05 18 5.2 .12 .07 .05 .04 .02 .08 .22 .02 .02 .01 .03 19 .13 .12 .07 .05 .06 .02 .09 .05 .02 .02 .01 .02 20 .08 .11 .07 .05 .04 .02 .09 .02 .02 .03 .01 .02 21 .05 .09 .07 .05 .02 .02 .03 .01 .02 .01 .01 .03 22 .05 .09 .06 .05 .02 .02 .07 .01 .01 .01 .02 .03 23 .05 .09 .05 .04 .03 .02 .10 .01 .18 .02 .02 .03 24 .05 .09 .07 .03 .05 .01 .13 .02 .05 .02 .01 .06 25 .05 .61 .07 .04 .05 .01 .12 .02 .02 .02 .01 .05 26 .03 1.0 .06 .03 .02 .01 .03 .01 .02 .01 .02 .02 27 .03 .25 .05 .03 .03 .02 .02 .01 .02 .01 .23 .03 28 .04 .15 .05 .03 .03 .02 .02 .01 .02 .04 .06 .22 29 .03 .13 .05 .04 --- .02 .04 .01 .02 .02 .06 .07 30 .03 .12 .07 .04 .07 .05 .01 .01 .01 .05 .05 31 .03 --- .05 .02 .02 --- .02 --- .01 .02 --- TOTAL 7.01 142.80 4.08 1.58 .89 .65 1.29 1.21 .74 .48 .78 4.14 MEAN .23 4.76 .13 .05 .03 .02 .04 .04 .02 .01 .02 .14 MAX 5.2 74 1.3 .13 .06 .07 .13 .22 .18 .04 .23 2.5 MIN .01 .06 .05 .02 .02 .01 .01 .01 .01 .01 .01 .02 CFSM .47 9.71 .27 .10 .07 .04 .09 .08 .05 .03 .05 .29 IN. .53 10.84 .31 .12 .07 .05 .10 .09 .06 .04 .06 .31 AC-FT 14 283 8.1 3.1 1.8 1.3 2.6 2.4 1.5 .9 1.5 8.2 CAL YR 1984 TOTAL 168.87 MEAN .46 MAX 74 MIN .00 CFSM .94 IN. 12.82 AC-FT 335 WTR YR 1985 TOTAL 165.65 MEAN .45 MAX 74 MIN .01 CFSM .92 IN. 12.58 AC-FT 329 ST. THOMAS, U.S. VIRGIN ISLANDS 363 50252000 BONNE RESOLUTION GUT AT BONNE RESOLUTION, ST. THOMAS, VI--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS MARCH 1983 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TUBE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) JAN, 23 1448 0.3 2170 22.0 I I I I I I I 364 ST. THOMAS, U.S. VIRGIN ISLANDS 50276000 TURPENTINE RUN AT MARIENDAL, ST. THOMAS, VI LOCATION.--Lat 18019°48", long 64°52 ° 58", Hydrologic Unit 21020001, on left bank, at Mariendal, 1.0 i (1.6 km) upstream from mouth, and 3.3 i (5.3 km) southeast of Fort Christian, Charlotte Amalie. DRAINAGE AREA.--2.97 sq i (7.69 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1963 to April 1969, October 1978 to September 1980, June 1982 to current year. GAGE.--Water-stage reoorder. Elevation of gage is 40 ft (12 m), from topographic map. REMARKS.--Estimated daily discharges: Nov. 7-14. 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 cu ft/s (0.034 cu m/s), 5.58 in/yr (142 mm/yr), 884 acre-ft/yr (1.09 cu hm/yr); median of yearly mean discharges, 0.54 cu ft/s (0.015 cu /s), 390 acre-ft/yr (0.48 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,710 cu ft/s (275 cu m/s), Apr. 18, 1983, gage height, 11.09 ft (3.380 m), fro floodmark, fro rating curve extended above 500 cu ft/s (14.2 cu 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 YEAR.--Peak discharges greater than base discharge of 100 cu ft/a (2.83 cu m/s) and maximums (4): Discharge Gage height Discharge Gage height Date Time (cu ft/a) (cu /s) (ft) (m) Date Time (cu ft/s) (cu m/s) (ft) (a) Oct. 6 2030 178 5.04 3.31 1.009 May 18 1145 104 2.95 2.40 0.732 Oct. 16 1800 433 12.3 4.27 1.301 Aug. 27 0430 176 4.98 2.97 0.905 Nov. 5 1715 $2,600 73.6 $6.80 2.073 Minimum discharge, 0.02 cu ft/a (0.001 ou m/s), Oct. 5. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .61 .67 2.2 .84 .72 .95 .51 .31 .28 .18 .20 .80 2 1.1 .50 2.3 1.1 .70 .88 .60 .35 .34 .23 .23 .71 3 .54 2.9 1.9 .87 .73 .88 .45 .27 .22 .31 .23 .49 4 .31 3.3 1.8 1.0 .66 .75 .53 .41 .24 .21 .31 .45 5 .11 209 1.5 .87 .66 3.3 .61 .55 .22 .17 .19 .48 6 11 58 1.5 1.4 .66 .74 .38 .27 .22 .24 .20 .45 7 6.7 270 1.5 1.1 .67 .92 .55 .31 .25 .46 .19 .45 8 1.1 70 1.5 .89 .65 .66 .36 .27 .35 .19 .27 .60 9 .46 25 1.7 .83 .63 .84 .45 .25 .36 .22 .27 .44 10 1.3 10 1.3 .83 .71 .83 .35 .33 .44 .21 .35 .44 11 .39 7.0 1.3 .83 .63 .50 .31 .39 .83 .22 .38 .46 12 .56 3.8 1.3 .82 .60 .48 .43 .63 .95 .24 .26 5.4 13 .36 5.2 1.3 .84 .59 .43 .62 .24 .97 .23 .24 13 14 .56 3.5 1.3 .75 .59 .39 .59 .29 .80 .37 .29 2.3 15 .28 2.2 1.2 .79 .60 .42 .28 .37 .65 .20 .26 .55 16 27 1.8 1.3 .74 .61 .51 .38 .47 .86 .35 .26 .27 17 6.9 2.4 1.3 .76 .65 .40 .29 .52 .56 .27 .25 .25 18 15 1.9 1.0 .75 .61 .40 .38 15 .44 .22 .36 .21 19 1.8 1.7 1.2 .88 1.1 .40 .40 1.2 .49 .20 .21 .20 20 1.3 1.6 1.3 .83 .72 .34 .37 .38 .50 .35 .21 .37 21 .89 1.6 1.0 .79 .68 .38 .60 .36 .52 .47 .22 .23 22 .40 2.0 1.0 .80 .93 .26 .26 .30 .61 .32 .24 .29 23 .48 1.6 1.0 .75 .74 .29 .41 .29 2.4 .25 .28 .38 24 .26 1.5 .95 .73 .97 .36 .49 .31 .71 .22 .40 .54 25 .23 6.3 1.4 .73 .78 .25 .33 .29 .37 .18 .67 .38 26 .27 6.2 1.4 .73 1.1 .42 .54 .33 .22 .21 .34 .33 27 .23 3.5 1.2 .76 .99 4.1 .49 .35 .22 .28 16 .20 28 .40 2.8 .97 .73 1.3 .57 .50 .21 .28 .60 .85 .42 29 .28 2.4 .94 2.1 --- 2.2 .25 .23 .27 .27 .69 .64 30 .29 2.2 1.4 .86 1.4 .30 .24 .42 .28 4.6 .35 31 .81 --- .83 .75 .95 --- .24 --- .20 .87 --- TOTAL 81.92 710.57 41.79 27.45 20.98 26.20 13.01 25.96 15.99 8.35 30.32 32.08 MEAN 2.64 23.7 1.35 .89 .75 .85 .43 .84 .53 .27 .98 1.07 MAX 27 270 2.3 2.1 1.3 4.1 .62 15 2.4 .60 16 13 MIN .11 .50 .83 .73 .59 .25 .25 .21 .22 .17 .19 .20 CFSM .89 7.98 .45 .30 .25 .29 .14 .28 .18 .09 .33 .36 IN. 1.03 8.90 .52 .34 .26 .33 .16 .33 .20 .10 .38 .40 AC-FT 162 1410 83 54 42 52 26 51 32 17 60 64 CAL YR 1984 TOTAL. 1019.91 MEAN 2.79 MAX 270 MIN .07 CFSM .94 IN. 12.77 AC-FT 2020 WTR YR 1985 TOTAL 1034.62 MEAN 2.83 MAX 270 MIN .11 CFSM .95 IN. 12.96 AC-FT 2050 ST. THOMAS, U.S. VIRGIN ISLANDS 365 50276000 TURPENTINE RUN AT MARIENDAL, ST. THOMAS, VI—Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS MARCH 1983 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURK (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) JAN, 23 1202 0.6 2140 23.6 I I I I I I I I I ST. JOHN, U.S. VIRGIN ISLANDS 366 50295000 GUINEA GUT AT BETHANY, ST. JOHN, VI LOCATION.--Lat. 18.19'55", long 64°46'50", Hydrologic Unit 21020001, 600 ft (183 m) southeast of Bethany Church, and 1.0 i (1.6 km) east of Government House at Cruz Bay. DRAINAGE AREA.--0.37 sq mi (0.96 sq km). 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 a), from topographic map. Prior to September 1982, at datum 1.00 ft (0.30 a) higher. REMARKS.--Estimated daily discharges: Nov. 5-14. Records poor. AVERAGE DISCHARGE.--7 years (1964-67, 1983-85), 0.09 ou ft/a (0.003 ou /s), 3.41 in/yr (87 mm/yr), 67.38 acre-ft/yr (0.083 cu ha/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 946 cu ft/s (26.8 cu /s), Apr. 18, 1983, gage height, 5.33 ft (1.625 ), fro floodmark, from rating curve extended above 1.0 cu ft/s (0.028 cu a/m) on basis of step-backwater analysis and slope-area measurement of peak flow; no flow any days each year. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 10 cu ft/s (0.283 cu /s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (cu ft/s) (cu /s) (ft) (a) Date Time (cu ft/s) (cu /s) (ft) (m) Nov. 4 2245 110 3.12 2.78 0.847 Nov. 6 1415 16 0.45 2.14 0.652 Nov. 5 1715 $154 4.36 *3.04 0.926 Nov. 7 0615 152 4.30 3.03 0.924 No flow many days. No flow many days. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .00 .01 .16 .04 .01 .01 .01 .01 .00 .01 .01 .01 2 .00 .01 .12 .04 .01 .01 .01 .01 .00 .01 .01 .01 3 .00 .03 .12 .04 .02 .01 .01 .01 .00 .01 .01 .01 4 .00 3.2 .12 .04 .02 .01 .01 .01 .00 .01 .01 .01 5 .00 18 .12 .04 .02 .01 .01 .01 .00 .01 .01 .01 6 .01 4.3 .12 .04 .02 .01 .01 .01 .00 .01 .01 .01 7 .01 43 .12 .03 .02 .01 .01 .01 .00 .01 .01 .01 8 .00 2.1 .10 .03 .02 .01 .00 .01 .00 .01 .01 .01 9 .00 .86 .10 .03 .02 .01 .00 .01 .00 .01 .01 .01 10 .00 .52 .10 .02 .01 .01 .00 .01 .00 .01 .01 .01 11 .00 .39 .09 .02 .02 .01 .00 .01 .00 .01 .01 .01 12 .00 .31 .08 .02 .02 .01 .00 .01 .00 .01 .01 .01 13 .01 .20 .08 .02 .02 .01 .00 .01 .00 .01 .01 .01 14 .00 .26 .07 .02 .01 .00 .00 .01 .01 .01 .01 .01 15 .00 .16 .07 .04 .01 .00 .01 .01 .01 .01 .01 .01 16 .00 .13 .07 .04 .01 .01 .01 .01 .00 .02 .01 .01 17 .00 .13 .05 .04 .01 .01 .00 .01 .00 .01 .01 .01 18 .01 .12 .04 .04 .01 .01 .00 .21 .00 .01 .01 .01 19 .01 .12 .04 .04 .01 .01 .00 .01 .00 .01 .01 .01 20 .01 .11 .03 .04 .01 .01 .01 .00 .00 .01 .01 .01 21 .01 .10 .03 .04 .01 .01 .01 .00 .00 .01 .01 .01 22 .00 .10 .03 .04 .01 .01 .01 .00 .00 .01 .01 .01 23 .00 .10 .03 .04 .01 .01 .01 .00 .00 .01 .01 .01 24 .00 .10 .03 .03 .01 .01 .02 .00 .01 .01 .01 .01 25 .00 .20 .03 .02 .01 .01 .02 .00 .01 .01 .01 .01 26 .00 .40 .06 .02 .01 .01 .02 .00 .01 .01 .01 .01 27 .00 .22 .06 .01 .01 .01 .01 .00 .01 .01 .01 .01 28 .00 .15 .06 .01 .01 .01 .01 .00 .01 .01 .01 .01 29 .01 .11 .06 .01 .01 .01 .00 .01 .01 .01 .01 30 .00 .09 .04 .02 .01 .01 .00 .01 .01 .01 .01 31 .01 --- .04 .01 .01 --- .00 --- .01 .01 --- TOTAL .09 75.53 2.27 .92 .38 .29 .23 .39 .09 .32 .31 .30 MEAN .00 2.52 .07 .03 .01 .01 .01 .01 .00 .01 .01 .01 MAX .01 43 .16 .04 .02 .01 .02 .21 .01 .02 .01 .01 MIN .00 .01 .03 .01 .01 .00 .00 .00 .00 .01 .01 .01 CFSM .01 6.81 .20 .08 .04 .02 .02 .04 .01 .03 .03 .03 IN. .01 7.59 .23 .09 .04 .03 .02 .04 .01 .03 .03 .03 AC-FT .2 150 4.5 1.8 .7 .6 .5 .8 .2 .6 .6 .6 CAL YR 1984 TOTAL 79.68 MEAN .22 MAX 43 MIN .00 CI"HM .59 IN. 8.01 AC-FT 158 WTR YR 1985 TOTAL 81.12 MEAN .22 MAX 43 MIN .00 CFSM .59 IN. 8.16 AC-FT 161 ST. JOHN, U.S. VIRGIN ISLANDS 367 50295000 GUINEA OUT AT BETHANY, ST. JOHN, VI--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS MARCH 1983 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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) JAN, 24 0938 0.04 2540 21.5 I I I I I ST. CROIX, U.S. VIRGIN ISLANDS 368 50345000 JOLLY HILL GUT AT JOLLY HILL, ST. CROIX, VI LOCAT1ON.--Lat 17°44'00", long 64°51'47", Hydrologic Unit 21020002, on Mahogany Road at Jolly Hill, 1.8 mi (2.9 km) northeast of Frederikated. DRAINAGE AREA.--2.10 sq i (5.44 sq km). 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-created concrete control. Elevation of gage is 140 ft (42.7 ) from topographic map. REMARKS.--Estimated daily discharges: Feb. 11 to Mar. 19. Records poor. AVERAGE DISCHARGE.--8 years (1964-68, 1983-85), 0.071 cu ft/s (0.002 cu /s), 0.46 in/yr (11.7 mm/yr), 51.4 acre-ft/yr (0.06 cu ha/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 288 cu ft/s (8.156 cu /s), Nov. 7, 1984, gage height, 3.62 ft (1.103 m); no flow any days each year. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 25 cu ft/s (0.71 cu m/a) and maximum (I): Discharge Gage height Date Time (cu ft/a) (cu m/s) (ft) (a) Nov. 7 0600 *491 13.905 *4.33 1.320 No flow Oct. 1-18, 20-31, Nov. 1-4, June 11-22, 26-30, July 1 to Sept.12, 15-30. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG BHP 1 .00 .00 .84 .33 .30 .17 .17 .09 .01 .00 .00 .00 2 .00 .00 .70 .33 .26 .16 .16 .09 .01 .00 .00 .00 3 .00 .00 .60 .33 .23 .16 .18 .09 .01 .00 .00 .00 4 .00 .00 .56 .32 .23 .15 .17 .09 .01 .00 .00 .00 5 .00 .12 .56 .33 .22 .16 .16 .08 .01 .00 .00 .00 6 .00 .71 .52 .36 .21 .15 .16 .08 .01 .00 .00 .00 7 .00 65 .52 .37 .26 .32 .16 .08 .01 .00 .00 .00 8 .00 4.9 .52 .33 .26 .25 .16 .07 .01 .00 .00 .00 9 .00 2.2 .55 .33 .26 .20 .16 .07 .01 .00 .00 .00 10 .00 1.6 .51 .33 .21 .18 .15 .07 .01 .00 .00 .00 11 .00 1.3 .49 .33 .19 .17 .14 .04 .00 .00 .00 .00 12 .00 1.2 .46 .33 .18 .16 .14 .04 .00 .00 .00 .00 13 .00 1.2 .46 .33 .22 .15 .14 .03 .00 .00 .00 .08 14 .00 1.6 .45 .35 .19 .14 .14 .05 .00 .00 .00 .01 15 .00 1.2 .41 .35 .18 .14 .14 .04 .00 .00 .00 .00 16 .00 1.1 .41 .35 .17 .14 .14 .04 .00 .00 .00 .00 17 .00 .99 .41 .35 .17 .14 .14 .05 .00 .00 .00 .00 18 .00 .94 .39 .35 .23 .14 .14 .05 .00 .00 .00 .00 19 .08 .88 .37 .34 .19 .14 .13 .04 .00 .00 .00 .00 20 .00 .82 .37 .33 .17 .14 .12 .04 .00 .00 .00 .00 21 .00 .72 .43 .33 .15 .16 .10 .02 .00 .00 .00 .00 22 .00 .70 .40 .31 .19 .17 .10 .02 .00 .00 .00 .00 23 .00 .66 .39 .35 .18 .15 .10 .02 .02 .00 .00 .00 24 .00 .57 .39 .42 .20 .13 .10 .02 .01 .00 .00 .00 25 .00 .67 .37 .45 .18 .13 .10 .02 .01 .00 .00 .00 26 .00 3.6 .37 .46 .20 .13 .10 .02 .00 .00 .00 .00 27 .00 .94 .37 .47 .18 .14 .10 .01 .00 .U0 .00 .00 28 .00 .78 .37 .44 .17 .32 .09 .01 .00 .00 .00 .00 29 .00 .73 .35 .35 --- .26 .08 .01 .00 .00 .00 .00 30 .00 .70 .42 .33 .18 .09 .01 .00 .00 .00 .00 31 .00 --- .40 .33 .18 --- .01 --- .00 .00 --- TOTAL .08 95.83 14.36 11.01 5.78 5.31 3.96 1.40 .14 .00 .00 .09 MEAN .00 3.19 .46 .36 .21 .17 .13 .04 .00 .00 .00 .00 MAX .08 65 .84 .47 .30 .32 .18 .09 .02 .00 .00 .08 MIN .00 .00 .35 .31 .15 .13 .08 .01 .00 .00 .00 .00 CFSM .00 1.52 .22 .17 .10 .08 .06 .02 .00 .00 .00 .00 IN. .00 1.70 .25 .20 .10 .09 .07 .02 .00 .00 .00 .00 AC-FT .2 190 28 22 11 11 7.9 2.8 .3 .00 .00 .2 CAL YR 1984 TOTAL 116.61 MEAN .32 MAX 65 MIN .00 CFSM .15 IN. 2.07 AC-FT 231 WTR YR 1985 TOTAL 137.96 MEAN .38 MAX 65 MIN .00 CFSM .18 IN. 2.44 AC-FT 274 ST. CROIX, U.S. VIRGIN ISLANDS 369 50345000 JOLLY HILL GUT AT JOLLY HILL, ST. CROIX, VI--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS MARCH 1983 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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) JAN, 22 1626 0.3 1010 22.6 Ground-Water Records for U.S. Virgin Islands I I I 372 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 sari. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 a), cased 6 in (0.15 ). DATUM.--Elevation of land-surface datum is about 20 ft (6.10 ) above mean sea level, from topographic map. Measuring point: Top of pump concrete base, 2.20 ft (0.67 a) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.-- Water levels: March 1982 to current year. Chemical analyses: June 20, 1983 to July 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 15.64 ft (4.77 a) below land-surface datum, Mar. 25, 1982; lowest water level measured, a58.57 ft (a17.9 ) below land-surface datum, June 20, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 2 18.02 Jan. 22 17.86 May 28 18.22 Sept. 16 a55.89 Nov. 19 17.77 Mar. 19 17.70 July 16 17.93 a Pumping. 373 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: 11SGS-10, Fairplains 2 (FP2). AQUIFER: Alluvium and marl. WELL CHARACTERISTICS: Drilled unused water-table well, diameter 6 in (0.15 ml, eased 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 1111 above land-surface datum. REMARKS.--Observation recording well. Nearby pumping well. PERIOD OF RECORD.--June 1983 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 21.80 ft (6.65 m) below land-surface datum , Jan. 3, 1984; lowest water level measured, 25.02 ft (7.63 m) below land-surface datum, Aug. 22, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 22.77 23.93 22.78 22.08 22.37 22.45 22.40 23.47 23.17 23.30 23.11 23.31 2 22.78 23.98 22.81 22.10 22.42 22.48 22.39 23.58 23.25 23.29 23.19 23.56 3 22.76 24.01 22.83 22.11 22.46 22.50 22.48 23.66 23.25 23.23 23.24 23.66 4 22.75 24.03 22.75 22.13 22.39 22.56 22.53 23.75 23.25 23.33 23.28 23.75 5 22.74 24.02 22.85 22.19 22.46 22.69 22.57 23.63 23.26 23.38 23.20 23.83 6 22.74 23.95 22.63 22.20 22.54 22.73 22.59 23.70 23.27 23.40 23.13 23.88 7 22.73 23.04 22.58 22.22 22.57 22.63 22.63 23.76 23.28 23.41 23.13 23.84 8 22.73 22.89 22.59 22.29 22.58 22.55 22.52 23.74 23.20 23.41 23.17 23.69 9 22.70 22.69 22.62 22.21 22.57 22.47 22.44 23.77 23.11 23.42 23.19 23.62 10 22.69 22.70 22.59 22.07 22.46 22.39 22.42 23.87 23.02 23.50 23.21 23.68 11 22.69 22.71 22.77 22.02 22.38 22.35 22.42 23.93 23.04 23.37 23.22 23.84 12 22.70 22.71 22.55 22.09 22.42 22.49 22.42 23.98 23.09 23.42 23.23 24.03 13 22.70 22.26 22.28 22.03 22.45 22.57 22.41 24.10 23.14 23.43 23.25 23.89 14 22.69 22.11 22.22 21.98 22.51 22.64 22.38 23.66 23.19 23.32 23.26 23.92 15 22.70 22.27 22.13 21.94 22.55 22.77 22.41 23.47 23.26 23.21 23.32 23.89 16 22.73 22.62 22.04 22.06 22.59 22.67 22.47 23.39 23.29 23.15 23.22 23.86 17 22.70 22.71 21.99 22.12 22.63 22.70 22.51 23.32 23.30 23.14 23.13 23.95 1P 22.71 22.68 22.03 22.19 22.55 22.66 22.57 23.35 23.31 23.19 23.10 24.03 19 23.33 22.71 22.07 22.25 22.58 22.56 22.59 23.36 23.31 23.24 23.04 23.94 20 23.48 22.76 22.08 22.29 22.52 22.50 22.65 23.38 23.33 23.27 23.03 24.14 21 23.55 22.74 22.09 22.33 22.49 22.46 22.65 23.40 23.32 23.27 22.98 24.15 22 23.60 22.66 22.11 22.38 22.51 22.58 22.55 23.34 23.43 23.28 22.95 24.24 23 23.62 22.62 22.11 22.30 22.53 22.59 22.47 23.37 23.40 23.29 23.01 24.24 24 23.69 22.58 22.11 22.21 22.55 22.60 22.42 23.44 23.25 23.32 23.11 24.03 25 23.75 22.57 22.16 22.16 22.62 22.61 22.70 23.42 23.17 23.34 23.18 23.74 26 23.80 22.49 22.21 22.19 22.60 22.66 23.17 23.39 23.16 23.34 23.24 23.74 27 23.84 22.64 22.21 22.27 22.48 22.65 23.32 23.29 23.21 23.32 23.33 23.69 28 23.87 22.41 22.25 22.32 22.44 22.65 23.39 23.23 23.28 23.23 23.40 23.57 29 23.82 22.60 22.16 22.39 --- 22.52 23.54 23.18 23.37 23.16 23.40 23.48 30 23.90 22.66 22.07 22.40 22.45 23.52 23.13 23.38 23.10 23.43 23.41 31 23.96 --- 22.02 22.46 22.47 --- 23.08 --- 23.05 23.28 --- LOW 23.96 24.03 22.85 22.46 22.63 22.77 23.54 24.10 23.43 23.50 23.43 24.24 HIGH 22.69 22.11 21.99 21.94 22.37 22.35 22.38 23.08 23.02 23.05 22.95 23.31 WTR \It 1985 MEAN 22.95 LOW 24.24 HIGH 21.94 21 -.1 22 m F V _rg 23 11 ,z 24 3 25 J J ASONDJFMAMJJ ASONDJFMAMJJ AS 1983 1984 1985 374 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.--Observation well. Automatic Digital Recorder (ADR) installed on June 22, 1983. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 14.76 ft (4.50 m) below land-surface datum, Mar. 25, 1982; lowest water level recorded, 28.62 ft (8.72 m) below land-surface datum, Sept. 30, 1985. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 27.91 28.20 19.06 23.01 24.69 25.65 27.17 27.24 27.35 27.81 28.15 28.40 2 27.99 28.21 19.20 23.07 24.74 25.67 27.17 27.25 27.37 27.82 28.16 28.41 3 28.00 28.22 19.37 23.11 24.77 25.69 27.18 27.25 27.39 27.83 28.17 28.42 4 28.01 28.22 19.54 23.18 24.81 25.72 27.18 27.25 27.40 27.84 28.18 28.43 5 28.02 28.23 19.70 23.26 24.86 25.75 27.19 27.26 27.44 27.85 28.19 28.43 6 211.03 28.23 19.87 23.32 24.89 25.78 21.19 27.2(1 27.4(1 27.87 28.19 28.44 7 28.03 27.87 20.04 23.37 24.94 25.82 27.19 27.26 27.48 27.88 28.20 28.45 8 28.04 25.91 20.21 23.43 24.99 25.84 27.19 27.27 27.50 27.90 28.21 28.46 9 28.04 23.62 20.39 23.52 25.01 25.86 27.21 27.27 27.51 27.91 28.22 28.47 10 28.05 21.87 20.56 23.57 25.06 25.88 27.21 27.27 27.54 27.93 28.23 28.48 11 28.06 20.75 20.69 23.62 25.10 25.91 27.21 27.27 27.55 27.94 28.24 28.48 12 28.07 19.62 20.86 23.67 25.12 25.93 27.21 27.27 27.57 27.95 28.24 28.49 13 28.07 18.79 21.03 23.75 25.15 25.95 27.21 27.27 27.58 27.96 28.25 28.50 14 28.08 18.34 21.15 23.80 25.19 25.98 27.21 27.28 27.59 27.97 28.26 28.50 15 28.09 18.13 21.29 23.85 25.23 26.00 27.22 27.28 27.61 27.98 28.27 28.51 16 28.09 18.02 21.43 23.91 25.26 26.02 27.22 27.28 27.62 28.00 28.28 28.52 17 28.10 17.98 21.58 23.95 25.30 26.04 27.22 27.28 27.63 28.01 28.29 28.54 18 28.10 17.97 21.74 24.00 25.33 26.06 27.22 27.28 27.64 28.03 28.29 28.54 19 28.11 18.01 21.89 24.07 25.35 --- 27.22 27.28 27.66 28.03 28.30 28.55 20 28.12 18.04 22.01 24.12 25.38 27.07 27.22 27.29 27.67 28.04 28.31 28.55 21 28.12 18.10 22.11 24.17 25.42 27.08 27.23 27.29 27.69 28.05 28.32 28.55 22 28.13 18.17 22.21 24.22 25.45 27.12 27.23 27.29 27.70 28.06 28.33 28.56 23 28.14 18.26 22.28 24.27 25.47 27.13 27.23 27.29 27.72 28.07 28.34 28.57 24 28.14 18.33 22.41 24.32 25.50 27.14 27.23 27.29 27.74 28.08 28.34 28.58 25 28.15 18.42 22.49 24.37 25.53 27.15 27.23 27.29 27.75 28.09 28.35 28.58 26 28.16 18.52 22.58 24.42 25.56 27.16 27.24 27.30 27.77 28.10 28.36 28.59 27 28.16 18.63 22.66 24.45 25.59 27.16 27.24 27.30 27.78 28.11 28.37 28.60 28 28.17 18.71 22.74 24.50 25.61 27.17 27.24 27.30 27.79 28.12 28.38 28.60 29 28.18 18.85 22.80 24.55 --- 27.17 27.24 27.31 27.80 28.13 28.38 28.61 30 28.18 18.96 22.87 24.60 27.17 27.24 27.32 27.80 28.14 28.39 28.61 31 28.19 --- 22.94 24.65 27.17 --- 27.34 --- 28.14 28.40 --- LOW 28.19 28.23 22.94 24.65 25.61 27.17 27.24 27.34 27.80 28.14 28.40 28.61 HIGH 27.91 17.97 19.06 23.01 24.69 .00 27.17 27.24 27.35 27.81 28.15 28.40 WTR Y8 1985 MEAN 26.02 LOW 28.61 HIGH .00 17 3 o? 20 all- Z < -u- 23 W W I -JO 26 3 29 JJASONDJFMAMJJASONDJFMAMJJAS 1983 1984 1985 I I I I GROUND-WATER LEVELS 375 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 a), cased 6 in (0.15 m), 0-104 ft (0-31.70 a), 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 ) above mean sea level, from topographic map. Measuring point: Lower edge of 1 in. (0.02 a) pipe at pump base, 3.40 ft (1.04 a) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.-- Water levels: January 1983 to current year. Chemical analyses: June 20, 1983 to July 1984, discontinued. EXTREMES FOR PERIOD OF RECORD: Highest water level measured, 23.09 ft (7.04 a) below land-surface datum, May 18, 1983; lowest water level measured, a58.30 ft (a17.77 m) below land-surface datum, September 27, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 2 a51.18 Jan. 22 26.95 May 28 28.94 Sept. 16 a30.10 Nov. 13 23.14 Mar. 19 27.92 July 16 28.79 174336064523200. Looal 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 a), cased 6 in (0.15 m), 0-104 ft (0-31.70 a), 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 ) above land-surface datum. Prior to December 1969, top of instrument platform, 2.57 ft (0.78 ) 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 ) below land-surface datum, Dec. 16, 1969; lowest water level measured, 74.31 ft (22.6 a) below land-surface datum, Mar. 29, 1965. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 2 72.85 Jan. 22 43.75 Mar. 19 50.27 July 16 67.15 Nov. 13 63.77 a Pumping. 376 GROUND-WATER LEVELS ST. CROIX, U.S. VIRGIN ISLANDS 174308064484400. Local number, 6. LOCATION.--Lat 17°43'03", long 64°48'44". Owner: U.S. Government, Virgin Islands Government.. Name: Adventure 28. AWIFER.--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 ml. 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) easing, 0.90 ft (0.27 m) above land-surface datum. REMARKS.--Observation well. Automatic Digital Recorder (ADR) installed on June 20, 1983. PERIOD OF RECORD.--August 1973 to March 1974, discontinued. March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 24.90 ft (7.59 m) below land-surface datum, Mar. 25, 1982; lowest water level measured, 40.18 ft (12.25 m) below land-surface datum, Aug. 5, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 37.89 39.87 37.78 37.59 37.94 38.07 37.54 37.37 38.08 38.69 39.22 39.73 2 39.67 39.87 37.43 37.62 37.95 38.06 37.52 37.39 38.10 38.71 39.24 39.74 3 39.70 39.87 37.52 37.66 37.96 38.03 37.50 37.40 38.12 38.73 39.26 39.76 4 39.72 39.89 37.51 37.68 37.98 38.01 37.48 37.42 38.14 38.75 39.27 39.77 5 39.73 38.90 37.48 37.71 37.99 38.00 37.46 37.45 38.15 38.77 39.29 39.79 6 39.75 37.87 37.48 37.71 38.00 37.98 37.43 37.48 38.18 38.79 39.31 39.81 7 39.76 38.47 37.48 37.62 38.02 37.96 37.42 37.50 38.20 38.80 39.32 39.83 8 39.66 38.20 37.51 37.54 38.01 37.94 37.40 37.53 38.22 38.83 39.34 39.83 9 39.60 39.05 37.53 37.53 38.02 37.91 37.39 37.56 38.23 38.85 39.35 39.84 10 39.60 38.78 37.53 37.58 38.02 37.88 37.37 37.58 38.25 38.87 39.37 39.85 11 39.62 38.30 37.49 37.62 38.03 37.85 37.36 37.60 38.28 38.89 39.37 39.85 12 39.66 38.09 37.51 37.62 38.03 37.83 37.35 37.62 38.29 38.90 39.39 39.86 13 39.69 37.92 37.55 37.55 38.03 37.82 37.34 37.65 38.32 38.92 39.40 39.86 14 39.73 37.85 37.58 37.50 38.04 37.79 37.32 37.68 38.34 38.94 39.42 39.86 15 39.73 37.81 37.60 37.50 38.04 37.77 37.30 37.69 38.36 38.95 39.44 39.86 16 39.66 37.79 37.63 37.56 38.05 37.76 37.30 37.70 38.37 38.98 39.46 39.86 17 39.59 37.78 37.63 37.61 38.07 37.74 37.30 37.72 38.40 38.98 39.47 39.87 18 39.59 37.78 37.61 37.66 38.09 37.72 37.30 37.75 38.42 38.98 39,49 39.87 19 39.62 37.79 37.64 37.72 38.09 37.70 37.30 37.77 38.44 38.99 39.51 39.87 20 39.68 37.79 37.68 37.76 38.08 37.69 37.30 37.78 38.47 39.00 39.53 39.87 21 39.74 37.79 37.72 37.76 38.08 37.68 37.30 37.80 38.49 39.01 39.55 39.87 22 39.79 37.79 37.75 37.77 38.08 37.67 37.30 37.82 38.52 39.03 39.56 39.87 23 39.83 37.79 37.76 37.78 38.08 37.66 37.32 37.85 38.53 39.08 39.58 39.87 24 39.85 37.80 37.75 37.82 38.08 37.64 37.32 37.87 38.55 39.10 39.60 39.88 25 39.88 37.80 37.65 37.85 38.08 37.63 37.32 37.89 38.57 39.12 39.62 39.91 26 39.90 37.80 37.57 37.87 38.08 37.63 37.32 37.91 38.59 39.14 39.64 39.93 L/ 39.91 37.78 37.50 37.89 38.08 37.62 37.32 37.95 38.62 39.15 39.66 39.95 28 39.91 37.78 37.50 37.90 38.08 37.62 37.32 37.98 38.64 39.17 39.68 39.95 29 39.91 37.78 37.56 37.91 --- 37.60 37.33 38.00 38.66 39.19 39.69 39.95 30 39.87 37.78 37.60 37.92 37.58 37.34 38.03 38.67 39.21 39.71 39.95 31 39.87 --- 37.60 37.93 37.56 --- 38.06 --- 39.22 39.73 --- LOW 39.91 39.89 37.78 37.93 38.09 38.07 37.54 38.06 38.67 39.22 39.73 :19.95 HIGH 37.89 36.47 32.43 37.50 36.95 37.56 37.30 37.37 38.08 37.92 39.22 38.86 WTR YR 1985 MEAN 38.36 LOW 39.95 HIGH 32.43 26 30 34 38 42 J J ASONDJFMAMJJ ASONDJFMAMJJ AS 1983 1984 1985 I I I I GROUND-WATER LEVELS ST. CROIX, U.S. VIRGIN ISLANDS 377 174525064460600. Local number, 7. LOCATION.--1,at 17°45'25", long 64°46'06". Owner: Virgin Islands Government. Name: Concordia 14. AQUIFER.--Sand and gravel. WELL CBARACTERISTICS.--Drilled production water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Depth 85 ft (25.91 ). 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, 15.66 ft (4.74 ) 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 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 2 27.95 Jan. 22 18.91 May 28 25.22 Sept. 16 27.91 Nov. 13 15.56 Mar. 19 21.67 July 16 25.47 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 ). 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.-- Water levels: March 1982 to current year. Chemical analyses: June 1983 to July 1984, discontinued. 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 ) below land-surface datum, Dec. 8, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 2 25.55 Jan. 22 18.80 May 28 24.21 Sept. 16 25.82 Nov. 13 16.68 Mar. 19 22.02 July 16 25.00 a Pumping. I I I I I I I I 378 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 ), cased 0-81 ft (0-24.7 ). Depth 81 ft (24.7 ). DATUM.--Elevation of land-surface datum is 35 ft (10.7 a) above mean sea level, from topographic sap. Measuring point: Hole in pump base, 2.20 ft (0.67 ) above land-surface datum. Previous to Mar. 25, 1982, hole in pump base 2.50 ft (0.76 ) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.-- Water levels: June 1962 to October 1968, discontinued. March 1982 to current year. Chemical analyses: October 1964 to October 1967, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 1.75 ft (0.53 a) below land-surface datum, May 11, 1966; lowest water level measured, 57.40 ft (17.5 ) below land-surface datum, Mar. 5, 1964. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oot. 2 11.72 Jan. 22 6.62 May 28 10.34 Sept. 16 a29.18 Nov. 13 3.18 Mar. 19 8.68 July 16 11.30 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 production water-table well, diameter 6 in (0.15 m), cased 0-130 ft (0-39.63 m), perforated 71-130 ft (21.64-39.63 a). Depth 130 ft (39.63 m). DATUM.--Elevation of land-surface datum is about 75 ft (22.86 ) above mean sea level, from topographic map. Measuring point: Hole on top of pump base, 2.00 ft (0.61 a) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.-- Water levels: March 1982 to current year. Chemical analyses: June 22, 1983 to July 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 61.86 ft (18.86 a) below land-surface datum, Mar. 26, 1982; lowest water level measured, a75.52 ft (a23.02 ) below land-surface datum, Sept. 8, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 2 64.60 Jan. 22 64.50 May 28 65.12 Sept. 16 a70.32 Nov. 13 65.42 Mar. 19 64.62 July 16 68.47 a Pumping. I I I I I I I I I I I I I I I GROUND-WATER LEVELS 379 ST. THOMAS, U.S. VIRGIN ISLANDS 182050064680400. 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 rooks of Cretaceous age. WELL CHARACTERISTICS.--Drilled water-table production well, diameter 6 in (0.15 ), eased 6 in (0.15 a) 0-25 ft (0-7.62 ), open hole 26-80 ft (7.62-24.4 ). Depth 80 ft (24.4 a). DATUM.--Elevation of land-surface datum is 80 ft (24.4 ) above mean sea level, fro topographic map. Measuring point: Top of 6 in (0.15 ) casing, 2.50 ft (0.76 ) above land-surface datum. Prior to Mar. 23, 1982, top of 6 in (0.15 ) casing, 1.30 ft (0.40 a) above land-surface datum. REMARKS.--Non-potable public-water supply and observation well. PERIOD OF RECORD.-- Water levels: October 1963 to August 1969, discontinued. March 1982 to current year. Chemical analyses: December 1963, discontinued. June 30, 1983 to July 1984, discontinued. 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 ) below land-surface datum, Aug. 24, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 2 53.16 Jan. 23 12.30 May 29 36.20 Sept. 18 a55.41 Nov. 20 2.33 Mar. 20 23.88 July 17 a45.20 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 ). DATUM.--Elevation of land-surface datum is 120 ft (36.6 ) above mean sea level, from topographic map. Measuring point: Top of 6 in (0.15 a) casing, 1.20 ft (0.36 a) 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, 18.43 ft (5.62 m) below land-surface datum, Nov. 20, 1983; lowest water level measured, 88.62 ft (27.01 a) below land-surface datum, Oct. 4, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Dale level Date level Oct. 4 88.62 Jan. 23 20.38 May 29 46.64 Sept. 18 79.72 Nov. 20 18.43 Mar. 21 29.70 July 17 50.28 182138064542500. Local number, 3. LOCATION.--Lat 18°21'38", long 64°54'25". Owner: Mahogany Run Resort. Name: Mahogany 16. AQUIFER.--Fractured rooks. WELL CHARACTERISTICS.--Drilled water-table production well, diameter 6 in (0.15 m), cased 6 in (0.15 ). Depth 145 ft (44.21 ). 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 a) casing, 1.30 ft (0.40 a) 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, 23.01 ft (7.01 m) below land-surface datum, Nov. 20, 1984; lowest water level measured, a103.85 ft (31.65 ) below land-surface datum, Oct. 4, 1984. WATER LEVEL, IN FEET BELOW LAND-SIJI1FACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 4 al03.85 Jan. 23 25.89 May 29 48.94 Sept. 18 52.95 Nov. 20 23.01 Mar. 21 28.90 July 17 48.92 a Pumping. I 380 GROUND-WATER LEVELS ST. THOMAS, U.S. VIRGIN ISLANDS 182136064541900. Local number, 4. LOCATION.--Lat 18°21'36", 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, 20.68 ft (6.30 m) below land-surface datum, Nov. 20, 1984; lowest water level measured, a60.40 ft (18.41 ) below land-surface datum, Sept. 10, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 4 a48.19 Jan. 23 u58.93 May 29 43.86 Sept. 18 42.92 Nov. 20 20.68 Mar. 21 a53.24 July 17 44.94 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.-- Water levels: March 1982 to current year. Chemical analyses: July 1, 1983 to June 1984, discontinued 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, 88.37 ft (26.94 m) below land-surface datum, July 21, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 4 80.34 Jan. 23 79.73 May 29 85.70 Sept. 18 86.82 Nov. 20 54.24 Mar. 21 85.64 July 17 87.14 a Pumping. 381 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), cased 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) above land-surface datum. Prior to June 27, 1983, top of 6 in (0.15 m) casing, 2.90 ft (0.88 m) above land-surface datum. REMARKS.--Observation well. Automatic Digital Recorder (ADR) was installed on June 27, 1983. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 5.19 ft (1.58 m) below land-surface datum, Nov. 27, 1984; lowest water level measured, 35.38 ft (10.79 m) below land-surface datum, July 21, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 22.47 6.22 12.03 16.92 18.76 21.13 22.63 21.93 23.50 24.87 22.64 2 22.29 6.32 12.37 17.07 18.64 21.17 22.65 22.03 23.59 24.95 22.74 3 22.17 6.50 12.64 17.21 18.66 21.24 22.69 22.10 23.65 25.01 22.86 4 22.38 6.71 12.90 17.31 18.75 21.33 22.76 22.17 23.66 25.07 23.04 5 22.76 6.92 13.11 17.41 18.82 21.42 22.80 22.26 23.73 25.10 23.37 6 23.04 7.10 13.28 17.52 18.92 21.50 22.84 22.33 23.80 25.11 23.75 7 22.54 7.32 13.42 17.62 19.05 21.52 22.89 22.41 23.87 25.12 24.09 8 21.22 7.48 13.50 17.74 19.13 21.53 22.96 22.47 23.91 25.10 24.37 9 20.52 7.64 13.64 17.82 19.13 21.55 22.99 22.53 23.95 25.01 24.56 10 20.22 7.76 13.78 17.93 19.15 21.66 23.01 22.58 24.00 24.94 24.76 11 20.17 7.91 13.91 18.05 19.21 22.01 23.02 22.65 24.07 24.95 24.90 12 20.56 8.12 14.05 18.12 19.30 22.13 23.03 22.72 24.11 24.96 25.07 13 21.07 8.27 14.18 18.18 19.43 22.17 23.03 22.77 24.09 25.00 25.06 14 21.44 8.43 14.29 18.26 19.57 22.21 23.00 22.82 24.14 25.04 23.37 15 21.68 8.55 14.42 18.33 19.73 22.24 22.96 22.88 24.16 24.99 21.33 16 21.85 8.70 14.57 18.39 19.87 22.27 22.91 22.93 24.17 24.98 20.40 17 21.82 8.89 14.71 18.47 19.99 22.29 22.85 22.98 24.03 25.01 20.09 18 21.18 9.06 14.88 18.55 20.07 22.31 22.74 23.01 23.96 25.05 20.16 19 19.75 9.24 15.06 18.62 20.18 22.34 21.93 23.05 23.95 25.07 20.53 20 19.14 9.39 15.25 18.59 20.28 22.37 21.27 23.16 24.00 25.10 20.90 21 18.85 5.43 9.53 15.43 18.58 20.35 22.40 21.06 23.33 23.89 25.13 21.23 22 --- 5.62 9.69 15.62 18.62 20.44 22.42 21.00 23.40 23.78 25.15 21.52 23 5.75 9.82 15.78 18.65 20.55 22.44 21.04 23.46 23.72 25.17 21.79 24 5.92 10.05 15.92 18.64 20.64 22.46 21.12 23.49 22.76 25.21 22.01 25 6.05 10.18 16.06 18.51 20.69 22.47 21.20 23.35 23.80 25.26 22.00 26 5.47 10.30 16.17 18.46 20.78 22.50 21.30 23.24 23.83 25.28 21.88 27 5.26 10.40 16.28 18.52 20.92 22.51 21.41 23.21 23.95 25.21 21.98 28 5.43 10.50 16.39 18.68 21.01 22.54 21.51 23.24 24.31 23.59 22.14 29 5.71 10.74 16.50 --- 21.05 22.57 21.61 23.29 24.53 23.18 22.27 30 5.98 11.24 16.62 21.06 22.61 21.74 23.36 24.68 23.27 22.39 31 --- 11.65 16.77 21.08 --- 21.82 --- 24.80 22.80 --- LOW 23.04 6.05 11.65 16.77 18.68 21.08 22.61 23.03 23.49 24.80 25.28 25.07 HIGH 18.85 5.26 6.22 12.03 16.92 18.64 21.13 21.00 21.93 22.76 22.80 20.09 WTR YR 1985 MEAN 19.63 LOW 25.28 MOH 5.26 4 0 10 M 4 W Z -Th6x- 16 d= .z :5 22 JJASONDJFMAMJJA SONDJFMAMJJA 1983 1984 1985 28 I I I I I I I I I I I I 382 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 a), 4 in (0.10 m) cased, 0-20 ft (0-6.10 ), open hole 20-99 ft (6.10-30.2 ). Depth 99 ft (30.2 ). DATUM.--Elevation of land-surface datum is 60 ft (18.3 ) above mean sea level, from topographic map. Measuring point: Top of 4 in (0.10 ) casing, 4.10 ft (1.25 ) above old land-surface datum after 1.4 ft (0.43 ) land fill and 2.7 ft (0.82 ) oasing extension occurred. Prior to June 29, 1983, top of 4 in (0.10 ) easing, 1.4 ft (0.43 a) above land-surfaon datum. REMARKS.--Observation well. Water levels affected by pumping nearby well. PERIOD OF RECORD.-- Water levels: May 1964, discontinued. June 30, 1983 to current year. Chemical analyses: May 1964, discontinued. June 30, 1983 to July 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 5.39 ft (1.64 ) below land-surface datum, Aug. 24, 1983; lowest water level measured, 42.56 ft (12.98 a) below land-surface datum, Aug. 30, 1967. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 2 27.52 Jan. 24 22.29 May 30 21.34 Sept. 19 28.00 Nov. 20 8.72 Mar. 20 28.35 July 18 32.92 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 Cretaceous 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 ). 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 a) 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.-- Water levels: August 1964 to December 1969, discontinued. March 1982 to current year. Chemical analyses: July 1964 to June 1969, discontinued. June 30, 1983 to July 1984, discontinued. 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 (a17.47 ) below land-surface datum, Nov. 27, 1968. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Dale level Date level Dale level Oct. 3 36.10 Jan. 24 18.20 May 30 a44.96 Sept. 19 a44.39 Nov. 20 12.83 Mar. 20 24.24 July 18 a47.92 a Pumping. 383 50 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. Automatic Digital Recorder (ADR) installed on June 29, 1983. PERIOD OF RECORD: Water levels: August 1964 to December 1969, discontinued. March 1982 to current, year. Chemical analyses: August 1964 to June 1969, discontinued. June 29, 1983. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 41.12 ft (12.54 m) below land-surface datum, Aug. 15, 1969; lowest water level measured, 63.15 ft (19.25 m) below land-surface datum, July 1, 1968. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SKP 1 57.64 57.20 53.49 55.84 56.05 56.45 56.60 56.83 56.94 57.55 57.69 57.55 2 57.66 57.21 53.55 55.86 56.06 56.45 56.64 56.85 56.95 67.55 57.71 57.55 3 57.75 57.21 53.62 55.90 56.12 56.45 56.65 56.86 56.96 57.55 57.72 57.56 4 57.74 57.19 53.73 55.92 56.18 56.45 56.64 56.86 56.96 57.59 57.73 57.58 5 57.74 57.12 53.76 55.95 56.25 56.44 56.64 56.88 56.96 57.61 57.74 57.59 6 57.73 56.78 53.82 56.02 56.30 56.45 56.65 56.91 56.97 57.64 57.73 57.59 7 57.70 55.99 53.92 56.07 56.32 56.46 56.67 56.93 56.99 57.65 57.69 57.56 8 57.62 53.43 54.00 56.10 56.34 56.46 56.71 56.93 57.02 57.65 57.66 57.55 9 57.57 52.20 54.10 56.10 56.37 56.47 56.75 56.92 57.06 57.64 57.62 57.54 10 57.52 51.57 54.19 56.07 56.42 56.46 56.79 56.92 57.10 57.64 57.59 57.55 11 57.49 51.17 54.29 56.06 56.43 56.44 56.83 56.94 57.14 57.65 57.58 57.56 12 57.48 51.11 54.37 56.06 56.40 56.43 56.85 56.95 57.18 57.67 57.58 57.53 13 57.45 51.01 54.46 56.06 56.31 56.44 56.88 56.96 57.22 57.69 57.59 57.50 14 57.45 51.19 54.61 56.07 56.27 56.46 56.88 56.96 57.26 57.70 57.60 57.43 15 57.45 51.39 54.72 56.07 56.25 56.52 56.88 56.96 57.30 57.71 57.62 57.38 16 57.41 51.64 54.77 56.04 56.24 56.58 56.88 56.95 57.32 57.72 57.61 57.35 17 57.32 51.84 54.81 55.99 56.28 56.61 56.90 56.95 57.33 57.69 57.61 57.35 18 57.24 52.03 54.86 55.98 56.33 56.64 56.91 56.94 57.33 57.67 57.61 57.33 19 57.15 52.22 54.95 55.97 56.40 56.67 56.91 56.88 57.34 57.64 57.61 57.32 20 57.06 52.40 55.03 55.98 56.41 56.71 56.92 56.80 57.37 57.62 57.61 57.31 21 56.99 52.57 55.12 56.02 56.42 56.72 56.92 56.75 57.42 57.59 57.62 57.31 22 56.94 52.80 55.21 56.07 56.44 56.70 56.92 56.75 57.45 57.57 57.63 57.32 23 56.92 53.01 55.24 56.11 56.46 56.63 56.90 56.76 57.46 57.57 57.65 57.32 24 56.93 53.15 55.29 56.10 56.47 56.58 56.86 56.79 57.46 57.57 57.69 57.31 25 56.94 53.26 55.33 56.08 56.47 56.56 56.84 56.82 57.46 57.57 57.71 57.30 26 56.98 53.41 55.39 56.06 56.47 56.57 56.83 56.84 57.46 57.59 57.72 57.30 27 57.03 53.50 55.44 56.05 56.46 56.60 56.83 56.86 57.49 57.61 57.71 57.32 28 57.08 53.56 55.55 56.07 56.46 56.61 56.83 56.87 57.51 57.62 57.66 57.34 29 57.13 53.55 55.64 56.08 --- 56.60 56.83 56.89 57.52 57.63 57.63 57.35 30 57.14 53.51 55.71 56.08 56.57 56.82 56.91 57.54 57.64 57.60 57.37 31 57.18 --- 55.79 56.06 56.57 --- 56.91 --- 57.66 57.56 --- LOW 57.75 57.21 55.79 56.11 56.47 56.72 56.92 56.96 57.54 57.72 57.74 57.59 HIGH 56.92 51.01 53.49 55.84 56.05 56.43 56.60 56.75 56.94 57.55 57.56 57.30 WTR YR 1985 MEAN 56.51 LOW 57.75 HIGH 51.01 J J ASONDJFMAMJJ ASONDJFMAMJJ AS 1983 1984 1985 59 384 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. (Sussanaherg) 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.--Observation well. Automatic Digital Recorder (ADR) installed on June 28, 1983. PERIOD OF RECORD.--September 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 3.20 ft (0.98 m) below land-surface datum, Nov. 7, 1984; lowest water level recorded, 22.71 ft (6.92 m) below land-surface datum, Sept. 30, 1985. WATER LEVEL, IN FEET BELOW LAND-SURFACE SATIIM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 21.88 21.78 8.67 12.02 14.63 16.62 18.07 19.33 19.76 20.73 21.62 22.28 2 21.89 21.80 8.79 12.08 14.73 16.68 18.09 19.37 19.80 20.76 21.65 22.30 3 21.91 21.83 8.83 12.14 14.79 16.72 18.16 19.40 19.84 20.78 21.68 22.31 4 21.91 21.83 8.83 12.22 14.82 16.77 18.19 19.43 19.87 20.79 21.71 22.32 5 21.92 17.46 8.83 12.31 14.84 16.82 18.22 19.51 19.90 20.81 21.73 22.34 6 21.94 11.55 9.34 12.40 14.85 16.87 18.28 19.53 19.93 20.82 21.76 22.35 7 21.86 3.20 9.47 12.45 14.85 16.94 18.34 19.58 19.96 20.82 21.78 22.37 8 21.85 3.20 9.63 12.55 14.85 16.99 18.38 19.62 19.99 20.95 21.82 22.39 9 21.69 3.20 9.73 12.65 15.31 17.02 18.42 19.67 20.02 20.98 21.84 22.41 10 21.55 3.20 9.82 12.72 15.40 17.05 18.46 19.70 20.05 21.02 21.86 22.42 11 21.45 3.20 9.95 12.78 15.48 17.08 18.51 19.73 20.08 21.06 21.88 22.44 12 21.40 3.20 10.09 12.88 15.55 17.12 18.57 19.77 20.11 21.09 21.90 22.46 13 21.38 3.20 10.20 12.99 15.63 17.18 18.62 19.81 20.15 21.12 21.92 22.47 14 21.37 3.20 10.33 13.09 15.71 17.23 18.66 19.84 20.18 21.15 21.94 22.47 15 21.37 3.20 10.44 13.17 15.77 17.29 18.70 19.86 20.21 21.18 21.96 22.47 16 21.37 3.20 10.53 13.24 15.81 17.35 18.75 19.88 20.25 21.21 21.99 22.49 17 21.37 3.20 10.66 13.33 15.96 17.40 18.78 19.90 20.28 21.27 22.02 22.50 18 21.37 9.51 10.79 13.37 16.04 17.45 18.82 19.45 20.31 21.28 22.04 22.52 19 21.37 9.61 10.92 13.44 16.07 17.49 18.88 19.89 20.34 21.28 22.06 22.54 20 21.39 9.70 11.05 13.56 16.13 17.53 18.93 19.79 20.37 21.30 22.08 22.56 21 21.41 9.78 11.13 13.68 16.21 17.57 18.97 19.68 20.41 21.33 22.10 22.58 22 21.43 9.84 11.25 13.77 16.28 17.65 19.00 19.60 20.45 21.36 22.12 22.59 23 21.46 9.86 11.34 13.87 16.33 17.70 19.04 19.56 20.47 21.38 22.13 22.61 24 21.49 9.90 11.49 13.99 16.36 17.73 19.07 19.55 20.49 21.41 22.16 22.62 25 21.53 9.96 11.61 14.05 16.45 17.76 19.10 19.55 20.52 21.44 22.1H 22.63 26 21.57 5.35 11.68 14.13 16.51 17.81 19.14 19.55 20.56 21.47 22.20 22.65 27 21.60 6.91 11.74 14.20 16.56 17.88 19.18 19.57 2(1.62 21.49 22.22 22.66 28 21.64 7.58 11.83 14.31 16.59 17.90 19.21 19.60 20.65 21.52 22.22 22.67 29 21.67 8.05 11.89 14.40 --- 17.93 19.25 19.64 20.67 21.55 22.24 22.69 30 21.71 8.41 11.97 14.47 17.97 19.29 19.70 20.70 21.57 22.25 22.70 31 21.74 --- 11.98 14.56 18.02 --- 19.72 --- 21.59 22.26 --- LOW 21.94 21.83 11.98 14.56 16.59 18.02 19.29 19.90 20.70 21.59 22.26 22.70 HIGH 21.37 3.18 8.67 12.02 14.63 16.62 18.07 19.33 19.76 20.73 21.62 .00 WTR YR 1985 MEAN 17.57 LOW 22.70 HIGH .00 1 J J ASONDJFMAMJJ ASONDJFMAMJJ AS 1983 1984 1985 8 14 20 26 I I I I I I I GROUND-WATER LEVELS 385 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 a). Sounded depth 145 ft (44.2 m). DATUM.--Elevation of land-surface datum is about 640 ft (195 ) above mean sea level, fro topographic map. Measuring point: Top of 6 in (0.15 ) casing, 1.40 ft (0.43 ) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.-- Water levels: September 1982 to current year. Chemical analyses: June 30, 1983 to June 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 32.15 ft (9.80 a) below land-surface datum, Jan. 24, 1985; lowest water level measured, a107.4 ft (a32.7 ) below land-surface datum, Sept. 19, 1985. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 3 45.77 Jan. 24 32.15 May 30 37.50 Sept. 19 a109.4 Nov. 17 39.08 Mar. 20 34.20 July 18 41.44 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 a). Sounded depth 60 ft (18.3 ). 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 a) casing, 0.60 ft (0.18 ) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 23.13 ft (7.05 a) below land-surface datum, Jan. 24, 1985; 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 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 3 34.57 Jan. 24 23.13 May 30 26.63 Sept. 19 46.61 Nov. 17 29.89 Mar. 20 24.08 July 18 30.42 182044064454900. Local number, 8. LOCATION.--Lat l8°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 a). Sounded depth 110 ft (33.5 a). 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 a) casing, 1.80 ft (0.55 a) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 19.33 ft (5.89 a) below land-surface datum, Jun. 24, 1985; lowest water level measured, 69.10 ft (21.06 m) below land-surface datum, Sept. 19, 1985. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 3 29.88 Jan. 24 19.33 May 30 22.30 Sept. 19 69.10 Nov. 17 25.15 Mar. 20 20.01 July 18 25.94 a Pumping. I I I I 386 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 (0.16 a), cased 6 in (0.15 ). Sounded depth 65 ft (19.8 ). DATUM.--Elevation of land-surface datum is about 640 ft (195 111) above mean sea level, from topographic map. Measuring point: Top of 6 in (0.15 a) 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, 26.07 ft (7.95 m) below land-surface datum, Jan. 24, 1985; lowest water level measured, 52.44 ft (15.99 ) below land-surface datum, May 19, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Ditto level Oct. 3 40.29 Jan. 24 26.07 May 30 32.77 Sept. 19 49.07 Nov. 17 27.87 Mar. 20 27.67 July 18 36.04 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 ). DATUM.--Elevation of land-surface datum about 640 ft (195 a) above mean sea level. Measuring point: Top of 6 in (0.15 m) casing, 2.00 ft (0.61 fo) 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, 23.75 ft (7.24 m) below land-surface datum, Jan. 24, 1985; lowest water level measured, 38.86 ft (11.84 m) below land-surface datum, Sept. 19, 1985. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 3 36.16 Jan. 24 23.75 May 30 28.30 Sept. 19 38.86 Nov. 17 24.33 Mar. 20 25.45 July 18 32.80 387 3 GROUND-WATER LEVELS HT. 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. AQUTFER.--Louisenhoj Formation (Donnelly, 1959). WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), cased 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.--Observation well. Automatic Digital Recorder (ADR) installed on June 28, 1983. PERIOD OF RECORD: Water levels: March 1982 to current. year. Chemical analyses: June 30, 1983 to June 27, 1984, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 3.34 ft (1.02 m) below land-surface datum, May 25, 1982; lowest water level recorded, 25.19 ft (7.68 m) below land-surface datum, Sept. 30, 1985. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 20.30 3.78 4.03 5.33 7.81 9.70 12.69 11.82 17.77 22.07 24.17 2 --- 20.33 3.80 4.04 5.52 7.86 9.80 12.79 11.87 18.08 22.16 24.20 3 20.27 20.25 3.84 4.07 5.70 7.91 9.93 12.89 11.90 18.37 22.25 24.23 4 20.29 20.07 3.86 4.09 5.85 8.00 10.03 13.01 11.94 18.62 22.34 24.27 5 20.34 15.01 3.87 4.13 6.05 8.09 10.14 13.12 11.99 18.85 22.43 24.30 6 20.38 10.19 3.89 4.11 6.22 8.16 10.27 13.23 12.05 19.05 22.53 24.33 7 20.25 7.64 3.91 4.01 6.38 8.21 10.42 13.33 12.11 19.25 22.61 24.38 8 20.03 7.28 3.87 4.07 6.48 8.14 10.53 13.45 12.17 19.43 22.69 24.43 9 19.87 6.77 3.88 4.14 6.58 8.16 10.65 13.57 12.24 19.61 22.76 24.46 10 19.76 6.31 3.83 4.14 6.67 8.18 10.78 13.66 12.32 19.77 22.84 24.53 11 19.70 5.90 3.88 4.19 6.73 8.25 10.91 13.76 12.41 19.93 22.90 24.58 12 19.67 5.60 3.91 4.24 6.81 8.31 11.02 13.84 12.51 20.07 22.97 24.63 13 19.65 5.33 3.94 4.29 6.92 8.41 11.11 13.92 12.61 20.20 23.04 24.66 14 19.67 5.07 3.97 4.36 7.03 8.47 11.21 14.01 12.71 20.33 23.10 24.68 15 19.72 4.92 4.02 4.38 7.14 8.57 11.30 14.09 12.81 20.45 23.20 24.69 16 19.74 4.77 4.06 4.45 7.27 8.64 11.41 14.15 12.90 20.56 23.27 24.71 17 19.71 4.60 4.00 4.46 7.43 8.69 11.50 14.24 13.02 20.65 23.35 24.73 18 19.70 4.49 4.03 4.42 7.50 8.79 11.63 13.91 13.14 20.74 23.43 24.75 19 19.70 4.40 4.05 4.50 7.53 8.88 11.75 10.97 13.23 20.83 23.51 24.79 20 19.73 4.30 4.08 4.57 7.53 8.96 11.84 10.58 13.35 20.93 23.58 21.82 21 19.76 4.22 4.11 4.63 7.61 9.03 11.94 10.81 13.48 21.05 23.66 24..86 22 19.79 4.15 4.14 4.67 7.73 9.16 12.04 11.02 13.60 21.12 23.73 21.90 23 19.82 4.08 4.15 4.72 7.82 9.26 12.09 11.16 13.71 21.23 23.79 24.94 24 19.85 4.07 4.12 4.78 7.71 9.36 12.09 11.27 13.80 21.32 23.87 24.99 25 19.91 4.02 4.14 4.86 7.79 9.46 12.14 11.35 13.91 21.42 23.93 25.02 26 19.96 3.80 4.01 4.87 7.84 9.55 12.20 11.44 14.04 21.52 23.98 25.05 27 20.01 3.79 3.94 4.94 7.87 9.57 12.30 11.51 15.60 21.62 24.07 25.09 28 20.07 3.77 3.99 5.03 7.85 9.56 12.41 11.59 16.38 21.71 24.06 25.12 29 20.13 3.78 4.06 5.13 --- 9.57 12.51 11.66 16.94 21.81 24.08 25.17 30 20.18 3.79 3.95 5.12 9.59 12.59 11.73 17.39 21.88 24.10 25.18 31 20.25 --- 3.98 5.23 9.61 --- 11.78 --- 21.98 24.12 --- LOW 20.38 20.33 4.15 5.23 7.87 9.61 12.59 14.24 17.39 21.98 24.12 25.18 HIGH 19.65 3.77 3.78 4.01 5.33 7.81 9.70 10.58 11.82 17.77 22.07 24.17 WTR YR 1985 MEAN 13.07 LOW 25.18 HIGH 3.77 JJASONDJFMAMJJASONDJFMAMJJAS 1983 1984 1985 27 389 INDEX Page Page Access to WATSTORE data 32 Bayamon, at Flood Channel at Bayamon, Rio de 136-137.293 near Aguas Buenas 132-133 Acre-foot. definition of 33 Bayamon basin. Rio de, ground-water records in 335 Adenosine triphosphate. definition of 33 low-flow partial-record stations in 293 Adjuntas. Lago Garzas No. 1 near water-quality records in 132-137 dam near 313.319,320.321 Bayamon. Can° de Quebrada Catalina at 293 Adjuntas, Rio Blanco near 272 Bayamon, Quebrada Santa Catalina at 293 Adjuntas, Rio Grande de Arecibo near 70-71 Bayamon, Rio Hondo at 293 Aguada, Rio Culebra near 308 Bayamon, Rio Guaynabo near 134-135 Aguada, Rio Culebrinas near 288-289,308 Bayamon, Rio Hondo II near 293 Aguada. Rio Ingenio near 308 Bayaney. Rio Camuy near 64-65 Agua at Playa de Ponce. Quebrada del 306 Beatriz above Rio Turabo, Quebrada 294 Aguas Buenas, Rio de Bayamon near 132-133 Beatriz, Rio Turabo below Quebrada 294 Aguas Claras basin. Quebrada, low-flow partial-record Bed material, definition of 34 stations in 299 Bed load, definition of 42 Aguas Claras near Ceiba. Quebrada 299 Bed load discharge. definition of 42 Aguas Verdes basin, Quebrada, ground-water records Biochemical oxygen demand, definition of 34 in 349 34 Biomass. definition of Algae growth potential, definition of 33 Blanca at El Jagual, Quebrada 150-151 Analyses of samples collected at water-quality Blanco at mouth. Rio 301 partial-record stations in Puerto Rico 312-321 at Rio Blanco 300 Anton Ruiz at mouth. Rio 301 below La Fe 300 at Pasto Viejo 301 near Adjuntas 272 Anton Ruiz basin, Rio, ground-water records in 338 near Florida 205-206,300 low-flow partial-record stations in 301 Blanco basin, Rio, gaging station records in 203-206 Anasco, Rio Grande de Masco near 281-282 ground-water records in 337 Masco Arriba, Rio Grande de Masco at 307 low-flow partial-record stations in 300 Apeadero basin, Rio, ground-water records in 344 Blasina basin, Quebrada, low-flow partial-record Aquifer, definition of 33 stations in 294 Arecibo, Rio Grande de Arecibo above 78-79 water-quality records in 146-147 Arroyc, Rio Nigua at 304 Blasina near Carolina, Quebrada 146-147,294 Arroyo, Quebrada Corazon near 304 Blue-green algae, definition of 40 Arroyo, Quebrada Salada near 304 Bonne Resolution Gut at Bonne Resolution, Artesian, definition of 33 St. Thomas, VI 362-363 Artificial substrate, definition of 43 Boqueron at Boqueron, Quebrada 307 Arus, Rio InabOn near 306 Buquenin basin, Quebrada, low-flow partial-record Arus, Rio Jacaguas at 305 stations in 307 Ash mass, definition of 34 Boqueron, Laguna Cartagena near 256 Boqueron, Laguna Cartagena outflow near 257-258 Bairoa at mouth, Rio 295 Borinquen, Rio Turabo at 156-157 near Caguas 163-164 Botija at Highway 31, Quebrada 300 Bacteria, definition of 33 Botija basin, Quebrada, low-flow partial-record Bahia de San Juan No. 5 at San Juan 143 stations in 300 Balboa, Rio Yaguez at 307 390 INDEX Page Page Bottom material, definition of 34 Carolina, Rio Grande de Loiza at 296 BucanA basin, Rio, gaging station records in 236 Carruzos, Rio Canovanillas at 296 ground-water records in 356 Castafier, Lago Guayo near.......... .......... .. ...... 274 low-flow partial-record stations in .......... ..... 306 Castafier, Lago Prieto near 275 water-quality records in 237-238 Casta►er, Lago Yahuecaa near 273 BucanA at Ponce, Rio 306 Catafio, Rio Hondo at Flood Channel near 130-131 Cayaguas at Cerro Gordo, Rio 154-155 Caguas, Lago Loiza No. 4 near mouth near 317-318 Cayey, Lago Carite No. 1 near dam Caguas, Rio Bairoa near 163-164 near 315-316,319,320,321 Caguas, Rio Caguitas at Highway 30 at 161-162 Cayey, Lago Carite No. 3 on Rio de la Plata near 315 Caguas, Rio Grande de Loiza at 158-160 Ceiba at Ceiba, Quebrada 299 Caguas, Rio Turabo at 295 Ceiba basin, Quebrada, low-flow partial-record Caguitas above mouth, Rio 295 stations in 299 at Highway 30 at Caguas 161-162 Ceiba Norte, Rio Gurabo at 295 Caimito near Juncos, Quebrada 165-166 Ceiba, Quebrada Aguas Claras near 299 Calabazas, Rio Guayands at 302 Cells/volume, definition of 34 Cambalache near Loiza, Quebrada 297 Central Cambalache, Rio Grande de Arecibo at 87-88,292 Camp Eliza Colberg, Rio Espiritu Santo at 297 Central Guamani, Rio Seco near 304 Campo Rico, Rio Canovanas near 178-179 Central Roig, Cafio Santiago near 303 Camuy basin, Rio, gaging station records in 64-67 Central Roig, Rio Guayands at 302 low-flow partial-record stations in 292 Central Rufina, Rio Guayanilla at 246-247 Camuy at Capaez, Rio 292 Central San Vicente, Drainage Ditch at Rio Cibuco Camuy near Bayaney, Rio 64-65 below 113-114 near Hatillo 66-67 Central San Vicente, Rio Cibuco below 115-116 Canal Principal de Diversiones at Lago de Guajataca.. 56-57 Cerrillos near Ponce, Rio 236-238 Candelero at Highway 906, Rio 301 Cerro Gordo, Rio Cayaguas at 154-155 at mouth 302 Charco Hondo, Rio TanamA at 85-86 Candelero basin, Rio, low-flow partial-record Chemical oxygen demand, definition of 35 stations in 301-302 Chico at Providencia, Rio 219-220, 03 Canovanas at La Marina, Rio 296 Chico basin, Rio, low-flow partial-record stations at Loiza 296 in 303 near Campo Rico 178-179 water-quality records in 219-220 Canovanillas at Carruzos, Rio 296 Chlorophyll, definition of 35 at Loiza 296 Ciales, Rio Cialitos at Highway 649 at 99-100 Canas above Lago Loiza, Rio 296 Ciales, Rio Grande de Manati at 95-96 below Las Americas Avenue 306 Ciales, Rio Grande de Manati at Highway 149 at 97-98 near Santa Isabel 305 Cialitos at Highway 649 at Clales, Rio 99-100 Carlas basin, Rio, low-flow partial-record stations Cibuco at Vega Baja, Rio 109-111 in 305 below Central San Vicente 115-116 Carlo de Quebrada Catalina at Bayamon 293 below Corozal 106-108 Caonillas above Lago Caonillas near Jayuya, Rio 74-75 Cibuco basin, gaging-station records in 106-109 Capaez, Rio Camuy at 292 ground-water records in 329-332 Caparra Heights, Quebrada Margarita at 294 low-flow partial-record stations in 292 Carolina, Quebrada Blasina near 146-147,294 water-quality records in 107-116 Carolina, Rio Grande de Loiza above 296 391 INDEX Page Page Coamo basin, Rio, gaging-station records in 226 Demajagua at Demajagua, Rio 299 ground-water records in 348,349-351 Demajagua basin, Rio, low-flow partial-record low-flow partial-record stations 305 station in 299 water-quality records in 227-228 Descalabrado basin, Rio, gaging stations records in 229-230 Coamo near Coamo. Rio 226-228 low-flow partial-record stations in 305 near Santa Isabel 305 Descalabrado near Los Llanos, Rio 229-230 Colonia Dolores, Rio Herrera near 297 near Santa Isabel 305 Colonia Laura, Rio Guayands near 302 Diatoms, definition of 40 Color unit, definition of 35 Discharge at crest-stage partial-record stations 309 Comerio, Rio de la Plata near 121-122 Discharge at low-flow partial-record stations 292-308 Contents, definition of 35 Discharge at partial-record stations in Puerto Rico.. 292-309 Control, definition of 35 Discharge, definition of 35 Control structure, definition of 35 Dissolved, definition of 36 Cooperation 2 Dissolved-solids concentrations 36 Corazon basin, Quebrada, low-flow partial-record Diversity index, definition of 36 stations in 304 Drainage area, definition of 36 Corazon near Arroyo, Quebrada 304 Drainage basin, definition of 36 Corozal, Rio Cibuco below 106-108 Drainage ditch at Rio Cibuco below Central San Crest-stage station, definition of 35 Vicente 113-114 Crest-stage partial-record stations, discharge at.... 309 below Warner Lambert Lab. near Sabana 112 Cubic foot per second, definition of 35 Dry mass, definition of 34 Cubic foot per second-day, definition of 35 Cubic feet per second per square mile, definition of. 35 El Mango, Rio Gurabo at 295 Culebra basin, Rio, low-flow partial-record stations El Verde, Quebrada Sonadora near 182-183 in 308 El Verde, Quebrada Toronja at 184-185 Culebra near Aguada, Rio 308 El Verde, Rio Grande near 297 Culebrinas, at Highway 404 near Moca, Rio 286-287 Ensenada, Lajas East Drainage Canal near 307 near Aguada 288-289,308 Espiritu Santo basin, Rio, gaging station records in. 182-186 near San Sebastian 284-285 low-flow partial-record stations in 297 Culebrinas basin, Rio, gaging station records in 286 water-quality records in 183-188 ground-water records in 360 Espiritu Santo at Camp Eliza Colberg, Rio 297 low-flow partial-record stations in 308 near Rio Grande 186-188 water-quality records in 284-289 Explanation of records 11-33 Daguao above mouth, Rio 299 Fajardo at Fajardo, Rio 299 at Daguao 299 at Vapor below Confluence 299 Daguao, Quebrada Palma at 300 below Fajardo 201-202 Daguao basin, Rio, low-flow partial-record stations near Fajardo 195-200 in 299 Fajardo at Highway 194, Quebrada 298 Damsite, Lago Loiza at 175,296 Fajardo basin, Quebrada, low-flow partial-record Definition of terms 33-46 stations in 298 De los Cedros basin, Quebrada, low-flow partial- 195 Fajardo basin, Rio, gaging station records in record stations in 292 low-flow partial-record stations in 299 De los Cedros near Isabela, Quebrada 292 water-quality records in 196-202 392 INDRX Page Page Fajardo, Quebrada Mata Redonda near 299 Grande de Loiza basin, Rio, gaging station records Fecal coliform bacteria, definition of 34 in 148-178 Fecal streptococcal bacteria, definition of 34 ground-water records in.. ....... . ........ .......... 336 Florida, Rio Blanco near 205-206,300 low-flow partial-record stations in 294-296 Florida, Rio Grande de Arecibo below Lago Dos water-quality partial-record stations, analyses Bocas near 76-77 of samples collected in 317-318,319,320,321 water-quality records in 146-179 Gage-height, definition of 36 Grande de Manati at Ciales, Rio 95-96 Gaging station, definition of 36 at Highway 2 near Manati 101-103 Grande at La Gloria, Quebrada 296 at Highway 149 at Ciales 97-98 Grande basin, Rio, low-flow partial-record stations near Morovis 92-94 in 307 Grande de Manati basin. Rio, gaging station records Grande de Afiasco basin, Rio, gaging station in 92-101 records in 272-278 ground-water records in 326-328 ground-water records in 359 water-quality records in 90-104 low-flow partial-record stations in 307 Grande de Patillas at Patillas, Rio 304 water-quality records in 276-282 at Providencia 304 Grande de Masco at Afiasco Arriba, Rio 307 below Quebrada Sonadora 303 near Afiasco 281-282 near Patillas 221-223 near Lares 276-277 Grande de Patillas basin, Rio, gaging station near San Sebastian 278-280 records in 221 Grande de Arecibo at Central Cambalache, Rio 87-88,292 low-flow partial-record stations in 303 above Arecibo 78-79 water-quality records in 222-223 below Lago Dos Bocas near Florida 76-77 Grande at Rio Grande, Rio 297 near Adjuntas 70-71 near El Verde 297 near Utuado 72-73 near Rincon 307 Grande de Arecibo basin, Rio, gaging station records Graphs: in 78-85 Ground-water levels at selected wells in Puerto ground-water records in 325 Rico and the U.S. Virgin Islands 6 low-flow partial-record stations in 292 Monthly-mean discharge of selected streams in water-quality partial-record stations, analyses of Puerto Rico 4 samples collected in 313-315,319,320,321 Green algae, definition of 40 water-quality records in 70-88 Grid showing system for numbering wells and Grande de Loiza above Carolina, Rio 296 miscellaneous sites (latitude and longitude).. 19 at Caguas 158-160 Ground-waterquality, records of 31-32 at Carolina 296 Ground-water records for Puerto Rico 324-360 at Highway 183 294 Ground-water records for U.S. Virgin Islands 372-387 at Jagual 294 Ground-water level, records of 29-31 at Quebrada Arenas 148-149 Ground-water station, definition of 36 at San Lorenzo North 294 Ground-water stations in Puerto Rico, map showing below Rio Emajagua 294 location of 16 below Trujillo Alto 176-177 INDEX 393 Page Page Ground-water wells in U.S. Virgin Islands, map showing location of 18 Guadiana near Naranjito, Rio 123-124 Guajataca above Lago de Guajataca. Rio 54-55 above mouth near Quebradillas 60-62,292 at Lares 52-53 below Lago de Guajataca 58-59 Guajataca basin, Rio, gaging station records in 54-60 ground-water records in 324 low-flow partial-record stations in 292 water-quality partial-record stations, analyses of samples collected in 312-313,319,320,321 water-quality records in 52-62 Guamani basin, Rio, ground-water records in 342 low-flow partial-record stations in 304 Guamani near Guayama, Rio 304 Guanajibo below San German, Rio 307 near Hormigueros 265-267 near San Germin 259-260,307 Guanajibo basin, Rio, gaging station records in 261-265,307 ground-water records in 357-358 low-flow partial-record stations in 307 water-quality records in 259-267 Guanica, Rio Loco at 252-253 Guanica, Rio Loco near 307 Guayama, Rio Guamani near 304 Guayanes above mouth at Playa de Guayands, Rio 213-214 at Calabazas 302 at Central Roig 302 at Playa de Guayanes 303 at Yabucoa 211-212,302 below Rio Arenas 302 near Colonia Laura 302 near mouth near Playa de Guayands 302 Guayands basin, Rio, ground-water records in 342,343 low-flow partial-record stations in 302-303 water-quality records in 211-214 Guayanilla at Central Rufina, Rio 246-247 near Guayanilla 244-245 Guayanilla basin, Rio, gaging station records in 244 ground-water records in 353 water-quality records in 245-247 Guaynabo near Bayamon, Rio 134-135 Guinea Gut at Bethany, St. John, VI 366-367 Gurabo at Gurabo. Rio 171-172 at Ceiba Norte 295 at El Mango 295 below Highway 943 295 near Gurabo 173-174 near Juncos 295 Gurabo, Quebrada Mamey near 169-170 Hacienda San Isidro, Rio Jacaboa at 303 Hardness, definition of 37 Hatillo, Rio Camuy rear 66-67 Hato Rey, Rio Piedras at 140-141 Herrera near Colonia Dolores, Rio 297 near Loiza 297 Herrera basin, Rio, low-flow partial-record stations in 297 Honda at Las Torres, Quebrada 295 Hondo at Bayamon, Rio 293 at Flood Channel near Cataiio, Rio 130-131 Hondo II near Bayamon, Rio 293 Hondo basin, Rio, low-flow partial-record stations in 293 water-quality records in 130-131 Hormigueros, Rio Guanajibo near 265-267 Hormigueros, Rio Rosario near 263-264 Humacao at Highway 3 at Humacao, Rio 208-210 at Las Piedras 301 Flood Channel near mouth 301 near Humacao 301 Humacao basin, Rio, gaging station records in 208 ground-water records in 345 low-flow partial-record stations in 301 water-quality records in 209-210 Hydrologic Bench-Mark Network, definition of 37 Hydrologic conditions, summary of 2-8 Hydrologic unit, definition of 37 Icacos near Naguabo, Rio 203-204 Identification numbers, stations 11-19 Inabon at Real Abajo, Rio 234-235 near Arus 306 394 INDEX Page Page Inabon basin, Rio, gaging station records in 234-235 La Gloria, Quebrada Grande at... ....... ..... 296 low-flow partial-record stations in 306 Lago Carite No.1 near dam near Cayey 315-316,319,320,321 Indio near Vega Baja, Rio 292 No. 3 on Rio de la Plata near Cayey................ 315 Ingenio basin, Rio, low-flow partial-record Lago de Guajataca, Canal Principal de Diversiones at. 56-57 stations in 308 No. 1 near dam near Quebradillas........312-313,319,320,321 Ingenio basin, Rio del, ground-water records in 360 No. 3 near mouth near Quebradillas 312 Ingenio near Aguada, Rio 308 Rio Guajataca above 54-55 Ingenio near Playa de Guayands, Rio del 303 Rio Guajataca below 58-59 near Yabucoa 302 Lago Dos Bocas No. 1 near dam near Instantaneous discharge, definition of 35 Utuado 314-315,319,320,321 Introduction 1 No. 3 at west branch near Utuado 314 Isabela, Quebrada de los Cedros near 292 Lago Garzas No. 1 near dam near Adjuntas 313,319,320,321 Lago Guayo near Castaner 274 Jacaboa at Hacienda San Isidro, Rio 303 Lago La Plata No. 3 near dam near Jacaboa basin, Rio, low-flow partial-record stations Naranjito 317,319,320,321 in 303 No. 5 near mouth near Naranjito 316 Jacaguas at Arus, Rio 305 Lago Loiza at damsite 175,296 at Juana Diaz 231-232 No. 4 near mouth near Caguas 317-318 Jacaguas basin, Rio, gaging station records in 231-232 No. 7 near dam near Trujillo Alto 318,319,320,321 ground-water records in 349 Lago Loiza, Rio Callas above 296 low-flow, partial-record stations in 305 Lago Prieto near Castafier 275 Jagual, Rio Grande de Loiza at 294 Lago Yahuecas near Castafier 273 Jagual, Quebrada Blanca at El 150-151 Laguna Cartagena basin, gaging station records in.... 256-258 Jauca, Rio Jueyes near 305 Laguna Cartagena near BoquerOn 256 Jayuya, Rio Caonillas above Lago Caonillas near 74-74 Laguna Cartagena outflow near Boqueron 257-258 Jimenez near Rio Grande, Quebrada 297 Laguna San Jose No. 2 at San Juan 142 Jobos, Rio Melania near 304 Laguna Tortuguero basin, water-quality records in.... 104 Jolly Hill Gut at Jolly Hill, St. Croix, VI 368-369 Laguna Tortuguero outlet near Vega Baja 104 Josefina at Pineiro Avenue, Quebrada 293 Lajas East Drainage Canal near Ensenada 307 Juan Gonzalez near Rio Grande, Quebrada 297 Lajas at Toa Alta, Rio 293 Juan Martin above mouth, Rio 298 La Marina, Rio Canovanas at 296 at Highway 3, Tributary to 298 Land-surface datum, definition of 37 Juan Martin basin, Rio, low-flow partial-record La Plata at Proyecto La Plata, Rio de 118-120 stations In 298 at Hwy 2 near Toa Alta 127 Juana Diaz, Rio Jacaguas at 231-232 at Toa Alta 125-126 Jueyes basin, Rio, low-flow partial-record stations near Comerio 121-122 in 305 La Plata basin, Rio de, gaging station records in.... 118-127 Jueyes near Jauca, Rio 305 ground-water records in 333-334 Juncos, Quebrado Caimito near 165-166 low-flow partial-record stations in 293 Juncos, Rio Gurabo near 295 water-quality partial-record stations, analyses of Juncos, Rio Valenciano near 167-168 samples collected in 315-317,319,320,321 water-quality records in 119-126 La Fe, Rio Blanco below 300 Lares, Rio Grande de Anasco near 276-277 La Fe, Quebrada Vaca below 300 Lares, Rio Guajataca at 52-53 INDEX 395 Page Las Bambuas at mouth, Quebrada 294 Las Piedras, Rio Humacao at 301 Las Piedras, Rio Valenciano near 295 Las Torres, Quebrada Honda at 295 Levels for Puerto Rico, ground-water 324-360 Levels for U.S. Virgin Islands, ground water 372-387 Limones near Yabucoa. Rio 302 Lizas, Rio Maunabo at 215-216 Loco at GuAnica. Rio 252-253 near GuAnica 307 Loco basin, Rio, low-flow partial-record stations in. 307 water-quality records in 252-253 Loiza, Quebrada Cambalache near 297 Loiza, Rio Can6vanas at 296 Loiza, Rio Canovanillas at 296 Loiza, Rio Herrera near 297 Los Llamas, Rio Descalabrado near 229-230 Low-flow partial-record stations. Discharge at 292-308 Low-flow partial-record in Eastern Puerto Rico, map showing 14 Low-flow partial-record in Central and Western Puerto Rico map showing 15 Luquillo, Quebrada Mata de PlAtano near 298 Luquillo, Rio Pitahaya near 298 Luquillo, Rio Sabana at 298 Macani at Magas Arriba. Rio 306 MacanA basin, Rio, low-flow partial-record stations in 306 Magas Arriba, Rio Macaw.* at 306 Majada at Rabo del Buey, Rio 305 Mamey near Gurabo, Quebrada 169-170 Mameyes at Mameyes, Rio 298 at Highway 191 at Mameyes 191-192,298 near Sabana 189-190 Mameyes basin, Rio, gaging station records in 189-192 low-flow partial-record stations in 298 Manati, Rio Grande de Manati at Highway 2 near 101-103 Maps: Location of continuous surface-water stations in Puerto Rico 12 Location of ground-water stations in Puerto Rico... 16 Location of ground-water stations in the U.S. Virgin Islands 18 Page Location of low-flow partial-record stations in Eastern Puerto Rico 14 Location of low-flow partial-record stations in Central and Western Puerto Rico 15 Location of maximum concentration of fecal coliform bacteria at sample sites 9 Location of maximum concentration of fecal streptococci bacteria at sample sites 10 Location of surface-water stations in the U.S. Virgin Islands 17 Location of water-quality stations in Puerto Rico 13 Rio Camuy basin 63 Rio Cibuco basin 105 Rio Culebrinas basin 283 Rio Grande de Arecibo basin 69 Rio Grande de Loiza basin 145 Rio Grande de Manati basin 89 Rio Guajataca basin 51 Rio Guanajibo basin 255 Rio Herrera to the Rio Anton Ruiz basins 181 Rio Hondo to the Rio Puerto Nuevo basins 129 Rio Humacao to the Rio Seco basins 207 Rio Inabon to the Rio Loco basins 233 Rio de la Plata basin 117 Rio Salinas to the Rio Jacaguas basins 225 Rio Yagiiez and the Rio Grande de Masco basins 269 Maracuta at Trujillo Bajo, Quebrada 296 Margarita at Caparra Heights, Quebrada 294 Mariana at Patagonia. Quebrada 301 Mata de PlAtano basin. Quebrada, low-flow partial- record stations in 298 Mata de PlAtano near Luquillo, Quebrada 298 Mata Redonda near Fajardo, Quebrada 299 Matilde basin, Rio, low-flow partial-record stations in 306 Maunabo at Lizas, Rio 215-216 at Maunabo 217-218,303 Maunabo basin, Rio, gaging station records In 215 ground-water records in 344 low-flow partial-record stations in 303 water-quality records in 216-218 Maximum concentrations of fecal coliform bacteria at sampled sites, map showing location of 9 Maximum concentrations of fecal streptococci bacteria at sampled sites, map showing location of.... 10 INDEX 396 Page Page MayagUez, Rio Yagiiez near 270-271 Palomas, Quebrada Susua at 307 Mean concentration, definition of 42 Parameter code, definition of 39 Mean discharge, definition of 35 Partial record station, definition of 39 Measuing point, definition of 37 Partial-record stations, Discharge at 292-309 Melania basin, Rio, low-flow partial-record stations Partial-record stations in Central and Western Puerto in 304 Rico, map showing location of low-flow 14 Melania near Jobos. Rio 304 Partial-record stations in Eastern Puerto Rico, Metamorphic stage, definition of 37 map showing location of low-flow 15 Methylene blue active substances, definition of 37 Particle size, definition of 39 Micrograms per gram, definition of 37 Particle-size classification, definition of 39 Micrograms per liter, definition of 37 Pasto Viejo, Rio Ant6n Ruiz at 301 Milligrams of carbon per area or volume per unit time Patagonia, Quebrada Mariana at 301 for periphyton and macrophytes and for Patillas, Rio Grande de Patillas at 304 phytoplankton, definition of 41 Patillas, Rio Grande de Patillas near 221-223 Milligrams of oxygen per area or volume per unit time Percent composition, definition of 40 for periphyton and macrophytes and for Periphyton, definition of 40 phytoplankton, definition of 41 Pesticides, definition of 40 Milligrams per liter, definition of 37 Phytoplankton. definition of 40 Moca, Rio Culebrinas at Highway 404 near 286-287 Picocurie, definition of 40 Morovis, Rio Grande de Manati near 92-94 Piedras, at Hato Rey, Rio 140-141 at Rio Piedras 293 Naguabo, Rio Icacos near 203-204 near Rio Piedras 138-139 Naguabo, Rio Santiago at 300 Pineiro Avenue, Quebrada Josefina at 293 Naranjito, Lago La Plata No. 3 near Pitahaya basin, Rio, low-flow partial-record stations dam near 317,319,320,321 in 298 Naranjito, Lago La Plata No. 5 near mouth near 316 Pitahaya near Luquillo, Rio 298 Naranjito, Rio Guadiana near 123-124 Plankton, definition of 40 National Stream-Quality Accounting Network, Playa de Guayands, Rio del Ingenio near 303 definition of 38 Playa de Guayands, Rio Guayands above mouth at 213-214 National Trends Network, definition of 39 Playa de Guayanes, Rio Guayands at 303 Natural substrate, definition of 43 Playa de Guayanes, Rio Guayands near mouth near 302 Networks and programs, special 8-11 Playa de Ponce, Quebrada del Agua at 306 Nigua at Arroyo, Rio 304 Polychlorinated biphenyls, definition of 41 Nigua basin, Rio, ground-water records in 341 Ponce, Rio Bucana at 106 low-flow partial-record stations in 304 Ponce, Rio Cerrillos near 236-238 Ponce, Rio Portugues at 242-243 Organic mass, definition of 34 Ponce, Rio Portugues at Highway 14 at 309 Organism, definition of 39 Ponce, Rio Portugues at Highway 2 by-pass at 306 Organism count/area, definition of 39 Ponce, Rio Portugues near 239-241 Organism count/volume, definition of 39 Portugues at Highway 14 at Ponce, Rio 309 Orocovis near Orocovis, Rio 90-91 at Highway 2 by-pass at Ponce 306 Palma at Daguao, Quebrada 300 at Ponce 242-243 Palma basin, Quebrada, low-flow partial-record stations in 300 near Ponce 239-241 INDU 397 Page Page Portuguas basin, Rio, crest-stage partial-record Rosario at Rosario, Rio 261-262 station in 309 near Hormigueros 263-264 gaging station records in 239 Runoff, in inches, definition of 41 ground-water records in 352 low-flow partial records stations in 306 Sabana at Luquillo. Rio 298 water-quality records in 240-243 at Sabana 193 Primary productivity, definition of 41 Sabana basin, Rio, gaging station records In 193-194 Programs, special networks and 8-11 low-flow partial-record stations in 298 Providencia, Rio Chico at 219-220,303 Sabana, Drainage ditch below Warner Lambert Providencia, Rio Grande de Patillas at 304 Lab. near 112 Proyecto La Plata, Rio de La Plata at 118-120 Sabana, Rio Mameyes near 189-190 Publications on techniques of water-resources Salada basin, Quebrada, low-flow partial-record investigations 47-48 stations in 304 Puerto Nuevo basin, Rio, ground-water records in 335 Salads near Arroyo, Quebrada 304 low-flow partial-record stations in 293-294 Salinas at Salinas, Rio 305 water-quality records in 138-143 Salinas basin, Rio, ground-water records in 346-347 low-flow partial-record stations in 305 Quality of water records of Puerto Rico, surface- Salvatierra near San Lorenzo, Quebrada 152-153 and 52-289 San German, Rio Guanajibo below 307 Quebrada Arenas, Rio Grande de Loiza at 148-149 San German, Rio Guanajibo near 259-260 Quebrada Sonadora, Rio Grande de Patillas below 303 San Juan, Bahia de San Juan no. 5 at 143 Quebradillas, Lago Guajataca No. 1 near San Juan, Laguna San Jose No. 2 at 142 San Lorenzo, Quebrada Salvatierra near 152-153 San Lorenzo North, Rio Grande de Loiza at 294 San Sebastian, Rio Culebrinas near 284-285 San Sebastian, Rio Grande de Masco near 278-280 Santa Catalina at Bayam6n, Quebrada 293 Santa Isabel, Rio Carias near 305 Santa Isabel, Rio Coamo near 305 Santa Isabel, Rio Descalabrado near 305 Santiago at Naguabo, Rio 300 Santiago at Highway 3, Carlo 303 near Central Roig 303 Santiago basin, Can°, low-flow partial-record stations in 303 Santiago basin, Rio, low-flow partial-record stations in 300 Seco basin, Rio, ground-water records in 339-340 low-flow partial-record stations in 304 Seco near Central Guamani, Rio 304 Sediment, definition of 42 7-day 10-year low flow, definition of 42 dam near 312-313,319,320,321 Quebradillas, Lago Guajataca No. 3 near mouth near... 312 Quebradillas, Rio Guajataca above mouth near 60-62,292 Rabo del Buey, Rio Majada at 305 Radiochemical program, definition of 41 Real Abajo, Rio Inabon at 234-235 Records, explanation of 11-33 Records of ground-water levels 29-31 Records of ground-water quality 31-32 Records of stage and water discharge 19-24 Records of surface-water quality 24-29 Recoverable from bottom material, definition of 41 Return period, definition of 41 Rincen, Rio Grande near 307 Rio Arenas, Rio Guayands below 302 Rio Emajagua, Rio Grande de Loiza below 294 Rio Grande, Quebrada Jimenez near 297 Rio Grande, Quebrada Juan Gonzalez near 297 Rio Grande, Rio Gramde at 297 Rio Grande, Rio Espiritu Santo near 186-188 398 INDEX Page Page Time-weighted average, definition of 44 125-126 Sodium-adsorption-ratio, definition of 43 182-183 Toa Alta, Rio de La Plata at Sonadora near El Verde, Quebrada 41 Toa Alta, Rio de La Plata at Highway 2 near 127 Solute, definition of Special network and programs 8-11 Toa Alta, Rio Lajas at 293 Specific conductance, definition of 43 Tons per acre-foot, definition of 45 Stage-discharge relation, definition of 43 Tons per day, definition of 45 Station identification numbers 11-19 Toronja at El Verde, Quebrada 184-185 St. Croix, VI, Jolly Hill Gut at Jolly Hill 368-369 Total, definition of 45 St. John, VI, Guinea Gut at Bethany 366-367 Total coliform bacteria, definition of 33 Streamflow, definition of 43 Total discharge, definition of 45 St. Thomas, VI, Bonne Resolution Gut at Bonne Total organism count, definition of 39 Resolution 362-363 Total-recoverable, definition of 45 St. Thomas, VI, Turpentine Run at Mariendal 364-365 Total sediment discharge, definition of 42 Substrate, definition of 43 Total-sediment load, definition of 42 Summary of hydrologic conditions 2-8 Tributary to Rio Juan Martin at Highway 3 298 Surface and quality-of-water records for Puerto Rico. 52-289 Tributary to Rio Santiago at Highway 192 300 Surface area, definition of 43 Tritium network, definition of 45 Surface-water quality, records of 24-29 Trujillo Alto, Lago Loiza Nu. 7 near Surface-water records for U.S. Virgin Islands 362-369 dam near 318,319,320,321 Surface-water stations in Puerto Rico, map Trujillo Alto, Rio Grande de Loiza below 176-177 showing location of 12 Trujillo Bajo, Quebrada Maracuta at 296 156-157 Surface-water stations in U.S. Virgin Islands, map Turabo at Borinquen, Rio 295 showing location of 17 at Caguas 294 Surficial bed material, definition of 43 below Quebrada Beatriz Suspended, definition of 43 Turabo, Quebrada Baatriz above Rio 294 Suspended-recoverable, definition of 44 Turpentine Run at Mariendal, St. Thomas, VI 364-365 Suspended sediment, definition of 42 Utuado, Lago Dos Bocas No. 1 near dam Suspended-sediment concentration, definition of 42 near 314-315,319,320,321 Suspended-sediment discharge, definition of 42 Utuado, Lago Dos Bocas No. 3 at west branch near 314 Suspended-sediment load, definition of 42 Utuado, Rio Grande de Arecibo near 72-73 Suspended-total, definition of 44 Utuado, Rio Tanama near 80-84 Sustia at Palomas, Quebrada 307 Vaca below La Fe, Quebrada 300 Tallaboa at Tallaboa, Rio 306 Valenciano at mouth, Rio 295 Tallaboa basin, Rio, low-flow partial-record stations near Juncos 167-168 in 306 near Las Piedras 295 Tanana at Charco Hondo, Rio 85-86 Vapor below confluence, Rio Fajardo at 299 near Utuado 80-84 Vega Baja, Laguna Tortuguero outlet near 104 Taxonomy, definition of 44 Vega Baja, Rio Cibuco at 109-111 Techniques of water-resources investigations, Vega Baja, Rio Indio near 292 publications on 47-48 Terms, definition of 33-46 Thermograph, definition of 44 399 Water-discharge, records of stage and Water-quality partial-record stations in Puerto Rico, analyses of samples collected at Water-quality stations in Puerto Rico, map showing location of Water-resources investigations, publications on techniques of Water year, definition of WATSTORE data, Access to WDR, definition of Weighted average, definition of Wells - Puerto Rico: Aguas Verdes basin, Quebrada Well 124 - Coqui 2 Anton Ruiz basin, Rio Well 173, Squibb Apeadero basin, Rio Well 125 - Patillas STP Bayamon basin, Rio de Well 42 - Cidra 2 Well 66 - Sabana Seca Blanco basin, Rio Well 171, Arroyo Bucana basin, Rio Well 141 - Restaurada 8A Cibuco basin, Rio Well 62 - Vega Alta 1 Well 70 - Sabana Hoyos Well 151 - Rice Program 1/3 Well 155 - La Trocha Well 156 - El Criollo #1 Well 167 - USGS Observation Well #3 Well 168 - Rice Program #4 Well 169 - Rice Program 115 Coamo basin, Rio Well 87 - Alomar 1 Well 144 - Jauca south well, site 1 Well 145 - Jauca north well, site 1 Well 146 - Hacienda Alomar west well, site 3 Well 147 - Hacienda Alomar east well, site 3 Well 148 - Playa Santa Isabel east well, site 2.. Well 149 - Playa Santa Isabel west well, site 2.. Culebrinas basin, Rio INDEX Page 19-24 312-321 13 47-48 45 32 45 46 346 338 344 335 335 337 356 329 330 331 331 331 332 332 332 348 349 350 350 350 351 351 Well 83 - San Sebastian Grande de Masco basin, Rio Well 53 - Mayagdez Airport Grande de Arecibo basin, Rio Well 86 - Adjuntas Well 123 - Jayuya 3 Well 161 - Santana 112 Grande de Loiza basin, Rio Well 50 - Gurabo Well 52 - Bairoa Grande de Manati basin, Rio Well 68 - Manati 2 Well 71 - Florida Afuera, Barceloneta Well 135 - Lederle Well 142 - Moran Sited Well 166 - Manati (new well) Guamani basin, Rio Well 89 - Phillips observation well 3 Guajataca basin, Rio Well 164 - Roche Moca Well 165 - Mateo Perez, Bo. Salto Guanajibo basin, Rio Well 40 - Rosario Well 43 - Central Rochelaise Well 143 - Vivoni, Hacienda Amistad Guayands basin, Rio Well 31 - Central Roig Well 96 - USGS TW-2 or Yabucoa 7 Guayanilla basin, Rio Well 27 - Quebradas Well 74 - Guayanilla Humacao basin, Rio Well 172 - Humacao Ingenio basin, Rio del Well 58 - Aguada Jacaguas basin, Rio Well 88 - Hacienda Potala La Plata basin, Rio de Well 33 - Cayey 10 Well 37 - Barrio RincOn de Cidra Well 38 - Barrio Robles Well 69 - Higuillar Well 150 - Monterey Forestal 359 325 325 325 336 336 326 326 327 328 328 342 324 324 357 357 358 342 343 352 353 345 360 349 333 333 333 334 334 400 Page INDEX Page Maunabo basin, Rio Well 122 - Maunabo Calzada Nigua basin, Rio Well 15 - Pitahaya 1 344 341 Well 8 - DPW-3 Well 9 - DPW-2 Well 10 - DPW-1 Well 11 - Guinea Gut Well 385 386 386 387 Portugues basin, Rio St. Thomas Well 21 - Alhambra 352 Well 1 - USGS-8 (Family well-Thatch Farm 379 Puerto Nuevo basin, Rio Well 2 - Mahogany 15 379 Well 65 - Hato Rey Central, McCraken 335 Well 3 - Mahogany 16 379 Salinas basin, Rio Well 4 - Mahogany 17 380 Well 1 - Mar Negro 346 Well 5 - Donoe 3 380 Well 8 - Salinas 1 346 Well 6 - Grade School 3 381 Well 18 - Cocos 346 YagUez basin, Rio Well 19 - Theater 1 347 Well 45 - Well 1, Mayaguez 359 Seco basin, Rio Yauco basin, Rio Well 2 - Puente Jobos 339 Well 16 - Central San Francisco 352 Well 3 - Jobos 339 Well 131 - Yauco 1 or UCC 2 353 Well 6 - Juana 5 340 Well 132 - Yauco 2 354 Well 134 - Yauco 4 or UCC 1 355 Wells - U.S. Virgin Islands: Wet mass, definition of 34 St. …