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Water Resources Data Water Year 1984 Puerto Rico and the ntoLOGICAt s "4--isT ON, v4. U.S. Virgin Islands * SEP 2 5 1985 * a R By Russell E. Curtis, Sene'n Guzmdn-Rros, and Pedro L. Diaz Culebra, PR St. Thomas C b St. Johr Vieques, PR VIRGIN ISLANDS St Croix U.S. GEOLOGICAL SURVEY WATER-DATA REPORT PR-84-1 Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands, and other agencies , Water Resources Data Puerto Rico and the U.S. Virgin Islands Water Year 1984 By Russell E. Curtis, Senn Guzmdn-Rros, and Pedro L. D(az St. Thomas Culebra, PR C; e St. John Vieques, PR C= b VIRGIN ISLANDS St. Croix U.S. GEOLOGICAL SURVEY WATER-DATA REPORT PR-84-1 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 personnel of the U.S. Geological Survey, Water Resources Division who collected, compiled, analyzed, verified, and organized the data, and who typed, edited, and assem­ bled 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, processing and tabula­ tions of the data: Zaida Aquino de Diaz Ralph Gonzglez George Arroyo Felipe Herngndez Raul Calderiin Carlos Martinez Eloy ColOn-Dieppa Rafael Pena-Cortes Margarita ConcepciOn Luis Santiago-Rivera Rene Garcia Pedro Vgzquez Jose R. Gonzglez Carmen A. Garcia typed the text of the report. Jose Alicea-Ortiz prepared the illustrations. 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 Ferdinand Quinones, District Chief, Caribbean District, San Juan, Puerto Rico. IV mnl 1. REPORT NO. 2. 3. Recipient's Accession No. REPORT DOCUMENTATION PAGE _ 4. Title and Subtitle 5. Report Date June 1985 Water Resources Data for Puerto Rico and the U.S. Virgin Islands, 6. 1984 7. Author(s) Russell E. Curtis, Senen Guzman-Rios, and Pedro Diaz 8. Performing Organization Rept. No. USGS-WDR-PR-84-1 9. Performing Organization Name and Address 10. Project/Task/Work Unit No. U.S. Geological Survey, Water Resources Division GPO Box 4424 11. Contract(C) or Grant(G) No. San Juan, Puerto Rico 00936 (C) (G) 12. Sponsoring Organization Name and Address 13. Type of Report & Period Covered U.S. Geological Survey, Water Resources Division Final. Oct. 1, 1983 to GPO Box 4424 Sept. 30, 1984 San Juan, Puerto Rico 00936 14. 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 1984 water year for Puerto Rico and the U.S. Virgin Islands, consist of records of discharge, water quality of streams, and water levels of wells. This report contains discharge records for 57 gaging stations; stage only records for four lakes; water quality for 63 streamflow or lagoon sites, 11 partial-record sites, and 17 wells; and water levels for 97 observation wells. Also included are data for 131 low-flow and 1 crest-stage partial record-stations. 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. Vigin 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. Identifiers/Open-Ended Terms Puerto Rico, U.S. Virgin Islands, Sampling sites. c. COSATI Field/Group 18. Availability Statemen:. 19. Security Class (This Report) 21. No. of Pages NO RESTRICTION ON DISTRIBUTION UNCLASSIFIED 20. Security Class (This Page) 22. Price UNCLASSIFIED (See ANSI-239.18) OPTIONAL FORM 272 (4-77) See Instructions on Reverse (Formerly NTIS-35) Department of Commerce V CONTENTS Page Preface III Contents V Illustrations V Tables VI Introduction 1 Cooperation 1 Summary of hydrologic conditions 2 Definition of terms 9 Downstream order and station numbers 16 Numbering system for wells and miscellaneous sites 17 Special networks and programs 17 Explanation of stage and water-discharge records 18 Collection and computation of data 18 Accuracy of field data and computed results 21 Other data available 22 Explanation of water-quality records 22 Collection and examination of data 22 Water analysis 23 Water temperature 23 Sediment 24 Explanation of ground-water level records 24 Collection of the data 24 Surface- and quality-of-water records for Puerto Rico 27 Discharge at partial-record stations in Puerto Rico 267 Analyses of samples collected at water-quality partial-record stations in Puerto Rico 285 Ground-water records for Puerto Rico 297 Surface-water records for the U.S. Virgin Islands 337 Ground-Water records for the U.S. Virgin Islands 347 Index 369 ILLUSTRATIONS Figure 1. Graph showing comparison of 1984 water year monthly-mean discharges to long-term medians of monthly-mean discharges at selected stream-gaging stations 3 2. Graph showing ground-water levels at selected sites in Puerto Rico and the U.S. Virgin Islands during 1984 water year 5 3. Map showing location of maximum concentration of fecal coliform bacteria at sampled sites during water year 1984 6 4. Map showing location of maximum concentrations of fecal streptococci bacteria at sampled sites during water year 1984 7 5. System for numbering wells and miscellaneous sites (latitude and longitude) 17 VI ILLUSTRATIONS--Continued Page Figure 6. Map showing location of continuous surface-water stations in Puerto Rico 28 7. Map showing location of water-quality stations in Puerto Rico 29 8. Map showing location of low-flow partial-record stations in Eastern Puerto Rico 30 9. Map showing location of low-flow partial-record stations in Central and Western Puerto Rico 31 10. Map showing Rio Guajataca basin 33 11. Map showing Rio Camuy basin 43 12. Map showing Rio Grande de Arecibo basin 47 13. Map showing Rio Grande de Manati basin 69 14. Map showing Rio Cibuco basin 87 15. Map showing Rio de la Plata basin 101 16. Map showing Rio Hondo to Rio Puerto Nuevo basins 113 17. Map showing Rio Grande de Loiza basin 129 18. Map showing northeastern river basins--Rio Herrera to Rio Anton Ruiz basins 159 19. Map showing southeastern river basins--Rio Humacao to Rio Seco basins 185 20. Map showing south coast river basins--Rio Salinas to Rio Jacaguas basins 203 21. Map showing south coast river basins--Rio InabOn to Rio Loco basins 209 22. Map showing Rio Guanajibo basin 231 23. Map showing Rio Yagliez and Rio Grande de Aiiasco basins 243 24. Map showing Rio Culebrinas basin 259 25. Map showing location of ground-water stations 298 26. Map showing location of surface-water stations in the U.S. Virgin Islands 338 27. Map showing location of ground-water stations in the U.S. Virgin Islands 348 TABLES Table 1. Maximum concentrations of trace metals of NASQAN stations, water year 1984. (Concentrations in micrograms per liter (ug/L)) 8 2. Factors for conversion of chemical constituents in milligrams or micrograms per liter to milliequivalents per liter 12 3. Degrees Celsius (°C) to degrees Fahrenheit (°F) 23 1 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 INTRODUCTION Water resources data for the 1984 water year for Puerto Rico and the U.S. Virgin Islands consists of stage, discharge, and water quality of streams; stage and water quality of lakes and lagoons; and water levels and quality of ground water. This report contains discharge records for 57 gaging stations; stage only records for four lakes; water quality for 63 streamflow or lagoon sites, 11 partial-record sites, and 17 wells; and water levels for 97 observa­ tion wells. Also included are data for 131 low-flow and 1 crest-stage partial record-stations. 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. Water-resources data for Puerto Rico for calendar years 1958-67 were released in a series of reports entitled "Water Records of Puerto Rico". Water- resources data for the U.S. Virgin Islands for the calendar years 1962-69 were released in a report entitled "Water Records of U.S. Virgin Islands." Included were records of streamflow, ground-water levels, and water-quality data for both surface and ground water. Beginning with the 1968 calendar year, surface-water records for Puerto Rico were released separately on an annual basis. Ground-water level records and water-quality data for surface and ground water were released in companion reports covering periods of several years. Data for the 1973-74 reports were published under separate covers. Water-resources data reports for 1975-76, 1977, 1978, 1979-80, 1981-82, and 1983 water years consist of one volume each and contain data for streamflow, water quality and ground water. These official Survey reports carry an identification number consisting of the two-letter state abbreviation, the last two digits of the water year, and the volume number. For example, this report is identified as "U.S. Geological Survey Water-Data Report PR-84-1." Water Data reports are for sale by the National Technical Information Service, U.S. Department of Commerce, Spring­ field, Virginia, 22161. COOPERATION The U.S. Geological Survey has had cooperative agreements with organizations 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 2 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 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. Evironmental Protection Agency. SUMMARY OF HYDROLOGIC CONDITIONS Streamflow Streamflow in Puerto Rico during the 1984 water year was generally below normal. It increased considerably in October, but remained significantly below normal during the remainder of the water year throughout most of the island. The exception was in the west, where it was well above normal most of the time. The dry season experienced during the winter months became evident in reduced flows as recorded for the index stations (fig. 1). The unusually low stream- flow continued to decline through March. The drought that affected the island caused the lowest levels in at least 20 years establishing low flow records for various gaged sites. For the northern and eastern river basins, flows were about 50 percent of normal. This severe drought came to an end at mid May and streamflow returned to normal. By June, streamflow increased to two to three times normal in the west. At this time, the second highest monthly mean since records began in 1964 was recorded at the index station on Rio Grande de Afiasco. During August, streamflow declined islandwide to below normal. Deficiencies in runoff were the most significant on the north coast. This drought ended in September as streamflow increased dramatically. The most significant changes occurred in the north and west areas where at many gaging sites the maximum flows for the year were recorded. On the Rio Grande de Manati, located in the northern area, the average for September was the second highest recorded since records began in 1964. In the U.S. Virgin Islands, conditions were in general the same as in Puerto Rico. During the year most streams were dry or nearly so, particularly in St. Croix and St. John. 3 1000 RIO GRANDE DE ANASCO NEAR SAN SEBASTIAN (50144000) 500 •z 200 1964-83 0 Median • co cc / w 100 Current year LL' 50 0 op 40 o 30 83181 I 1 1 1 1 1 z 80, 1 ti11111111 RIO INABON AT REAL ABAJO (50112500) 50 I\ 20- 1965-83 Median / ' p 7 10- _Current year A • MONTHLY MEAN D ISCHARGE. 2000 RIO GRANDE DE MANATI AT HWY 2 NEAR MANATI (50038100) 1000 1961-83 Median 500- 74 a z O 7-, / s. , „1 cc 200- Current year -• a. I— LL 100-- ° 80- m D 83184 1 I I 11111 z 50 ui200 O CC C.)co 100 0 z 2 50 I— z 0 2 8318 14 iiit 1 1 itiii 3 JASONDJFMAMJJAS JASONDJFMAMJJAS Figure 1.--Comparison of 1984 water year monthly-mean discharges to long-term medians of monthly-mean discharges at selected stream-gaging stations. 4 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 Ground Water Ground-water levels along the north coast limestone aquifers of Puerto Rico remained nearly unchanged during the 1984 water year (October 1983 to September 1984). A slight declining trend was observed during the first half of the water year followed by a slow recovery during the last half of the year in response to seasonal rainfall patterns. These near equilibrium conditions are a typical response of the north coast aquifers to average rainfall conditions. Ground-water levels along the south coast alluvial aquifers followed a cyclic pattern associated with rainfall and ground-water withdrawals for public supply, industrial and irrigation uses. Above normal rainfall from October to November 1983 caused ground-water levels to increase. Scarce rainfall and increasing water demands for irrigation resulted in decreasing levels through the end of the 1984 water year. At the Alomar well a maximum decline of 7.5 feet in the ground-water levels was recorded (fig. 2). Ground-water levels in the U.S. Virgin Islands (St. Thomas, St. Croix and St. John) followed a pattern similar to the south coast aquifers of Puerto Rico (fig. 2). Early in November 1983, above normal rainfall resulted in an increase up to 8.0 feet in the ground-water levels. After this event, the ground-water levels declined significantly as rainfall was almost zero and ground-water withdrawals for public-water supply increased. In several areas of St. Thomas and St. Croix, a decline of 15 feet in the ground-water levels was recorded. Water-Quality The results of the surface-water quality sampling program during water year 1984 indicated the presence of fecal coliform bacterias in high concentrations and the presence of some organic compounds. Concentrations of fecal coliform, and fecal streptococci bacterias exceed 1 million colonies counts per one 6 hundred milliliters of raw water (10 col/100 ml) in many streams. Rio Hondo at Flood Channel near Catano (50047530), Quebrada Blasina near Carolina (50050300), Rio Caguitas near Caguas(50055250), Rio Bairoa near Caguas (50055400), Rio Chico at Central Providencia (50091800), and Rio Guayanilla at Central Rufina (50124700) are among them (fig. 3 and 4). These sites are located close to urban zones, industrial parks and surburban zones not served by sewage systems. Septic tanks, cesspools, leaks in sewage system, runoff from beef cattle feed lots, and percolation from waste ponds appear to be the main source of bacterias in streams throughout Puerto Rico. Drinking water standards recommend that the geometric mean of fecal coliform density in raw water for public supply should not exceed 2,000 colonies per 100 ml of water (EPA, 1975). The standard for contact and recreational purposes is 1,000 col/100 ml. 5 WATER LEVEL, INFEETBELOW LAND-SURFACE 282 I 1 - WELL 135, LEDERLE, PUERTO RICO 28 3 284 I 285 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1983 1984 24 28 32 36 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1983 1984 10 • 16 WELL 11, GUINEA GUT, ST. JOHN, U.S.V.I. II 22 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1983 1984 Figure 2.--Ground-water levels at selected sites in Puerto Rico and the U.S. Virgin Islands during 1984 water year. 0\ 67015' 67000' 45' 30' 15' 66°00' 45' •65°30'7 OCEAN() ATLANTIC0 0 \06.0 t‘o 4,ko e 906 ee qs9e I 8030'1- 01 e e‘ tt4 6A s Rio Cuiebrinas Rib Guayabo Rio Grander( Fajardo Rio Grande de Aitasco 16' Rio Vague to Daguao Quebrada Palma Rio Guanailbo 1 \ Rio Santiago Rio Blanco Rib Anto Ruiz Rio Humacao 'Rio Guayana's 18000 A - 1 , oc7x4; e 0 A e e AN-ov t . 14% FECAL COLIFORMS V 0 (5 to A,24 \ 1o 0,v * ,b . , ir ii. ,-, o C'• co e to ' o o 4,0 to Ck kko to ia. Jok o 4 --4, i,44) r • < 1000 • 1000-10,000 ...et' ; o kl•• r 10,000-100,000 to • 17°45' O 10 20 30 KILOMETERS II 100,000-1,000,000 O 10 20 MILES > 1,000,000 MAR CAR1BE Figure 3.--Location of maximum concentration of fecal coliform bacteria at sampled sites during water year 1984 in Puerto Rico. 11 670 e 30' 15' 66000' 45` $5°30' 18°30' 4-A cptG OCEANO ATLANTIC° tit'' o 4G 0% 0A 0 ,k'S• „c, ottk s o R, 0 0 ° .0 04. <te * so(" ° Rto Cuiebrina Rto Guayabo Rio Grand $ 0 c? Rfo Fa rdo Rio Grande d Alfasco Rio Yaguez Rio Guanalibo to Daguao Ouebrada Palma Rio Santiago Rio Blanco Rio Antall Ruiz Rio Humacao 18°00' RIO Guayane's kk0 to ik 4Z.‘c,,Iso X10 oik 10. 0 .4) 0 FECAL STREPTOCOCCI • < 1000 • 1000-10.000 17°45' • O 1p 20 3 KILOMETERS 1 10 20 MiLtS MAR 4s° CA RIFE • ♦ • 10,000-100,000 100.000-1.000.000 > 1,000,000 Figure 4.--Location of maximum concentrations of fecal streptococci bacteria at sampled sites during water year 1984 in Puerto Rico. 8 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1983 A considerable increase in the concentration of key inorganic elements and/or compounds also is also an important index of the pollution of a body of water. Trace elements which are normally absent or nearly so in the natural environment are arsenic, cadmium, chromium, lead, mercury, selenium and silver. Water samples for analyses of those compounds were collected twice during the year at most of the monitoring sites. At the index National Stream Quality Accounting Network (NASQAN) stations, samples for analyses of trace metals were collected four times. Maximum concentrations of some of them are listed in table 1. TABLE 1 . Maximum concentrations of trace metals of NASQAN stations, Water Year 1984. (Concentrations in micrograms per liter( pg/L). Station number and name As Ba Cd Cr Pb Hg Se Ag 50038100 - Rio Grande de Manati at Hwy 2 near Manati 0.2 65 <1 <1 4 0.3 <1 2 50046000 - Rio de la Plata at Toa Alta .2 81 <1 <1 1 .6 <1 <1 50092000 - Rio Grande de Patillas on Patillas .1 24 <1 3 2 .2 <1 <1 50144000 - Rio Grande de Anasco near San Sebastign .2 49 <1 3 .1 <1 <1 Maximum permissible concentrations of these compounds in drinking water have been established by the Environmental Protection Agency (1976) as follows: Concentration Constituent Micrograms per liter (jig/L) Arsenic 50 Cadmium 10 Chromium 50 Lead 50 Mercury 2 Selenium 10 Silver 50 9 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 DEFINITION OF TERMS Terms related to streamflow, water-quality, and other hydrologic data as used in this report, are defined below. See also the table for converting inch- pound units to the International System of units (SI) on the inside of the back cover. Acre-foot (AC-FT, acre-ft) is the quantity of water required to cover 1 acre to a depth of 1 foot and is equivalent to 43,560 cubic feet or about 326,000 gallons or 1,233 cubic meters. Algae are mostly aquatic single-celled, colonial, or multicelled plants containing chlorophyll and lacking roots, stems, and leaves. Aquifer is a geologic formation, group of formations, or part of a formation that contains sufficient saturated permeable material to yield significant quantities of water to wells and springs. Artesian means confined and is used to describe a well in which the water level stands above the top of the aquifer, tapped by the well. A flowing artesian well is one in which the water level is above the land surface. Bacteria are microscopic unicellular organisms, typically spherical, rodlike, or spiral and threadlike in shape, often clumped into colonies. Some bacteria cause disease, 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. Fecal coliform bacteria are bacteria that are present in the intestines or feces of warm-blooded animals. They are often used as indicators 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 colonies 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 grampositive, coccie bacteria which are capable of growth in brain-heart infusion broth. In the laboratory they are definedas all the organisms which produce red or pink colonies within 48 hours at 35°C + 1.0°C on M-enterococcus medium (nutri- ent medium for bacterial growth). Their concentrations are expressed as number of colonies per 100 mL of sample. 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 10 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 at 35°C. In the laboratory these bacteria are defined as the organisms which produce colonies within 24 hours when incubated at 35°C + 1.0°C on M-Endo medium (nutrient medium for bacterial growth). Their concen­ trations are expressed 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. 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 contained cells per sample, usually milliliters (mL) or liters (L). Cfs-day is the volume of water represented by flow or 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 2,447 cubic meters. Chlorophyll refers to the green pigments of plants. Chlorophyll a and b are the two most common pigments in plants. Control designates a feature downstream from the gage that determines the stage-discharge relation at the gage. This feature may he 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 saltwater. 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 feet per second per square mile (CFSM) is the average number of cubic feet or water flowing per second from each square mile of area drained, assuming that the runoff is distributed uniformly in time and area. Cubic foot per second (cu ft/s) is the rate of discharge representing a volume of 1 cubic foot passing a given point during 1 second and is equivalent to approximately 7.48 gallons per second or 448.8 gallons per minute or 0.02832 cubic meters per second. 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. 11 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 Mean discharge (MEAN) is the arithmetic mean of individual daily mean discharges during a specific period. Instantaneous discharge is the discharge at a particular instant of time. Dissolved refers to the amount of substance present in true chemical solution. In practice, however, the term includes all forms of substance that will pass through a 0.45-micrometer membrane filter, and thus may include some very small (colloidal) suspended particles. Analyses are performed on filtered samples. Diversity index is a numerical expression of evenness of distribution of aquatic organisms. The formula for diversity index is: s n n. 7' i s a = _ E -IT log2 n i=1 Where n. 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 specific 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 river 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. 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 (CaCO). 12 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 Micrograms per gram (ug/g) is a unit expressing the concentration of a chem­ ical element as the mass (micrograms) of the element sorbed per unit mass (gram) of sediment. 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 concentration of chemical consitutents 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 2. TABLE 2.--Factors for conversion of chemical constituents in milligrams per liter to milliequivalents per liter. Ion Multiply by Ion Multiply by Aluminum (AI+3) * 0.11119 Iodide (I-1) 0.00788 Ammonia as NH4+' .05544 Iron (Fe+3)* .05372 Barium (Ba+2) .01456 Lead (Pb+2)* .00965 Bicarbonate (HCO3-1) .01639 Lithium (L1+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)* .0340G Chloride (Cl-1) .02821 Nitrate (NO3-1) .01613 Chromium (Cr+6 )* .11539 Nitrite (NO2-1) .02174 Cobalt (Co+2)* .03394 Phocphate (PO4-3) .03159 Copper (Cu+2)* .03148 Potassium (K+1) .02557 Cyanide (C/1-1)* .03844 Sodium (Na+1) .04350 Fluoride (F-1) .05264 Strontium (Sr+2)* .02283 Hydrogen (H+I) .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. Organism is any living entity, such as an insect, phytoplankter, or zoo­ plankter. Organism count/area refers to the number of organisms collected and enumerated in a sample and adjusted to the number per area habitat, usually square meters (m ), acres, or hectares. Periphyton, benthic organisms, and macrophytes are expressed in these terms. Organism count/volume refers to the number of organisms collected and enu­ merated 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. 2 13 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 Total organism count is the total number of organisms collected and enumerated in any particular sample. 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 suspended sediment or bed material determined by either sieve or sedimentation methods. Sedimen­ tation 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 recommendations made by the American Geophysical Union Subcommittee on Sediment Terminology. 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 material 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. 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. Pesticides are chemical compounds used to control undesirable plants and animals. Major categories of pesticides include insecticides, miticides, fungicides, herbicides, and rodenticides. Insecticides and herbicides, which control insects and plants, respectively, are the two categories reported. 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. Phytoplankton growth is dependent upon solar radiation and nutrient substances. 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. 14 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 Blue-green algae are a group of phytoplankton organisms having a blue pigment, in addition to the green pigment called chlorophyll. Blue-green often cause nuisance conditions in water. Diatoms are the unicellular or colonial algae having a siliceous shell. Their concentrations are expressed as number of cells/ml, of sample. Green algae have chlorophyll pigments similar in color to those of higher green plants. Some forms produce algal mats or floating "moss" in lakes. Their concentrations are expressed as number of cells/mL of sample. Polychlorinated biphenyls (PCBs) are industrial chemicals that are mixtures of chlorinated biphenyl compounds having various percentages of chlorine. They are similar in structure to organocblorine insecticides. 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. Sediment is solid material that originates mostly from disintegrated rocks and is transported by, suspended in, or deposited from water; it includes 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. Suspended sediment is the sediment that at any given time is maintained in suspension by the upward components of turbulent currents or that exists in suspension as a colloid. Suspended-sediment concentration is the velocity-weighted concentration 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). Suspended-sediment discharge (tons/day) is the rate at which dry weight of sediment passes a section of a stream or is the quantity of sediment, as measured by dry weight or volume, that passes a section in a given time. It is computed by multiplying discharge times concentration times 0.0027. The suspended-sediment concentration (mg/L) and suspended-sediment discharge (tons/day) except in stations 50028000 and 50071000 are based on instantaneous discharge and do not necessarily represent the actual daily discharge of suspended sediment. Suspended-sediment load is quantity of suspended sediment passing a sec­ tion in a specified period. 15 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 Total sediment discharge (tons/day) is the sum of the suspended-sediment discharge and the bed-load discharge. It is the total quantity of sedi­ ment, as measured by dry weight or volume, that passes a section during a given time. Mean concentration is the time-weighted concentration of suspended sediment passing a stream section during a 24-hour day. Solute is any substance derived from the atmosphere, vegetation, soil, or rocks 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 micromhos 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 "stream­ flow" is more general than "runoff" as streamflow may be applied to discharge whether or not it is affected by diversion or regulation. 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. The water-sediment mixture is associated with (or sorbed on) that material re­ tained on a 0.45 micrometer filter. 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. Tons per acre-foot indicates the dry mass of dissolved solids in 1 acre-foot of water. It is computed by multiplying the concentration in milligrams per liter by 0.00136. Tons per day is the quantity of substance in solution or suspension that passes a stream section during a 24-hour day. 16 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 Total load (tons) is the total quantity of any individual constituent, aE measured by dry mass or volume, that is dissolved in a specific amount of water (discharge) during a given time. It is computed by multiplying the total discharge, times the mg/L of the constituent, times the factor 0.0027, times the number of days. Taxonomy is the division of biology concerned with the classification and naming of organisms. The classification of organisms is based upon a hier­ archical 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, limbata is the following: Kingdom Animal Phylum Arthropoda Class Insecta Order Ephemeroptera Family Ephemeridae Genus Hexagenia Species....Hexagenia limbata 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. Thus, the water year beginning October 1, 1976 and ending September 30, 1977 is called the "1977 water year." Weighted average is used in this report to indicate discharge-weighted average for days 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. WRD is used as an abbreviation for "Water-Resources Data" in the REVISED RECORDS paragraph to refer to State annual basic-data reports published before 1975. WSP is used as an abbreviation for "Water-Supply Paper" in references to previously published REPORTS. DOWNSTREAM ORDER AND STATION NUMBER 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. 17 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 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 dis­ tinction is made between partial-record stations and other stations; there­ fore, the station number for a partial-record station indicates downstream order position in a list made up of both types of stations. Gaps are left in the series of numbers to allow for new 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." NUMBERING SYSTEM FOR WELLS AND MISCELLANEOUS SITES 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.5 , below). 66°53' 52' 51' 50' 49' 48' 66°47' 18°02 01' 134 132.4 X27 .74 COORDINATES FOR WELLS 27 (180150066474901), AND 74 (180110066473501). 131. COORDINATES FOR WELLS 132 (180133066503301), AND 134 (180120066503201). 18 0 00' 17°59 1.16 COORDINATES FOR WELL 131 (180058066502701) COORDINATES FOR WELL 16 (175922066495901). Figure 5.--System for numbering wells and miscellaneous sites (latitude and longitude). SPECIAL NETWORKS AND PROGRAMS National stream-quality accounting network (NASQAN) is a data collection net­ work designed by the U.S. Geological Survey to meet many of the information demands of agencies or groups involved in national or regional water-quality planning and management. Both accounting and broad-scale monitoring objectives 18 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 have been incorporated into the network design. Areal configuration of the network is based on river-basin accounting units (identified by 8-digit hydrologic-unit numbers) designated by the Office of Water Data Coordination in consultation with the Water Resources Council. Primary objectives of the network are (1) to depict areal variability of streamflow and water-quality conditions nationwide on a year-by-year basis and (2) to detect and assess long-term changes in streamflow and stream quality. Pesticide program is a network of regularly sampled water-quality stations where samples are collected to determine the concentration and distribution of pesticides in streams where potential contamination could result from the application of the commonly used insecticides and herbicides. Operation of the network is a Federal interagency activity. Tritium network is a network of stations which has been established to provide baseline information on the occurrence of tritium in the Nation's surface waters. In addition to the surface-water stations in the network, tritium data are also obtained at a number of precipitation stations. The purpose of the precipitation stations is to provide an estimate sufficient for hydrologic studies of the tritium input to the United States. EXPLANATION OF STAGE AND WATER-DISCHARGE RECORDS Collection and computation of data The base data collected at gaging stations consist of records of stage and measurements of discharge of streams. In addition, observations of factors affecting the stage-discharge relation or the weather records, and other information are used to supplement base data in determining the daily flow. Records of stage are obtained either from direct readings on a nonrecording gage or from a water-stage recorder that gives either a continuous graph of the fluctuations or a tape punched at selected time intervals. Measurements of discharge are made with a current meter, using the general methods adopted by the Geological Survey. These methods are described in standard textbooks, in Water-Supply Paper 2175, and in U.S. Geological Survey Techniques of Water Resources Investigations, book 3, chapter A6. For stream-gaging stations, rating tables giving the discharge for any stage are prepared from stage-discharge relation curves. If extensions to the rating curves are necessary to express discharge greater than measured, they are made on the basis of indirect measurements of peak discharge (such as slope-area or contracted-opening measurements, computation of flow over dams or weirs), step-backwater techniques, velocity-area studies, and logarithmic plotting. The daily mean discharge is computed from gage heights and rating tables, then the monthly and yearly mean discharge are computed from the daily figures. 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 discharge is computed by the shifting-control method, in which correction factors based on individual discharge measurements and notes by engineers and observers are used in applying the gage heights to the rating tables. If the stage-discharge relation for a station is temporarily changed 19 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 by the presence of aquatic growth or debris on the control, the daily mean discharge is computed by what is basically the shifting-control method. At some stream-gaging stations the stage-discharge relation is affected by the backwater from reservoirs, tributary streams, or other sources. This neces­ sitates 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 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 dis­ charge. 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 dis­ charges are estimated on the basis of recorded range in stage, prior and subsequent records, discharge measurements, weather records, and comparison with records for other stations in the same or nearby basins. The data in this report generally comprise a description of the station and tabulations of daily and monthly figures. For gaging stations on streams a table showing the daily discharge and monthly and yearly discharge is given. Records are published for the water year, which begins on October 1 and ends on September 30. The description of the gaging station gives the location, drainage area, period of record, notations of revisions of previously published records, type and history of gages, general remarks, average discharge, and extremes of discharge or elevation. The location of the gaging station and the drainage area are obtained from the most accurate maps available. River mileage, given under "LOCATION" for some stations, is that determined and used by the Corps of Engineers or other agencies. Periods for which there are published records for the present station or for stations generally equivalent to the present one are given under "PERIOD OF RECORD." Previously published streamflow records of some stations have been found to be in error on the basis of data or information later obtained. Revisions of such records are usually published along with the current records in one of the annual or compilation reports. In order to make it easier to find such revised records, a paragraph headed "REVISED RECORDS" has been added to the description of all stations for which revised records have been published. Listed therein are all the reports in which revisions have been published, each followed by the water years for which figures are revised in that report. In listing the water years only one number is given; for instance, 1965 stands for the water year October 1, 1964, to September 30, 1965. If no daily, monthly, or annual figures of discharge are affected by the revision, the fact is brought out by notations 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 revised figure was first published is given. It should be noted that for all 20 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 stations for which cubic feet per second per square mile and runoff in inches are published, a revision of the drainage area necessitates corresponding revision of all figures based on the drainage area. Revised figures of cubic feet per second per square mile and runoff in inches resulting from a revision of the drainage area only are usually not published in the annual series of reports. The type of gage currently in use, the datum of the present gage above mean sea level, and a condensed history of the types, locations, and datums of previous gages used during the period of record are given under "GAGE." In references to datum of gage, the phrase "mean sea level" denotes "Sea Level Datum of 1929" as used by the Topographic Division of the Geological Survey unless otherwise qualified. Information pertaining to the accuracy of the discharge records and to condi­ tions which affect the natural flow of the gaging station is given under "REMARKS." For reservoir stations information on the dam forming the reser­ voir, the capacity, outlet works and spillway, and purpose and use of the reservoir is given under "REMARKS." The average discharge for the number of years indicated is given under "AVER­ AGE DISCHARGE"; it is not given for stations having fewer than 5 complete years of record or for stations where changes in water development during the period of record cause the figure to have little significance. In addition, the median of yearly mean discharges is given for stream-gaging stations having 10 or more complete years of record if the median differs from the average by more than 10 percent. Under "EXTREMES" are given first, the extremes for the period of record, second, information available outside the period of record, and last, those for the current year. Unless otherwise qualified, the maximum discharge (or contents) is the instantaneous maximum corresponding to the crest stage obtained by use of a water-stage recorder (graphic or digital), a crest-stage gage, or a nonrecording gage read at the time of the crest. If the maximum gage height did not occur on the same day as the maximum discharge (or contents), it is given separately. Similarly, the minimum is the instantaneous minimum unless otherwise qualified. For some stations peak discharges are listed with EXTREMES FOR THE CURRENT YEAR; if they are, all independent peaks including the maximum for the year, above the selected base with the time of occurrence and corresponding gage heights are published in tabular format. The base discharge, which is given in the table heading, is selected so that an average of about three peaks a year will be presented. Peak discharges are not published for any canals, ditches, drains, or for any stream for which the peaks are subject to substantial control by man. Time of day is expressed in 24-hour local standard time; for example, 12:30 a.m. is 0030, 1:30 p.m. is 1330. The minimums for these stations are published in a separate paragraph following the table of peaks. 21 WATER RSOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 The daily table for stream-gaging stations gives the mean discharge for each day and is followed by monthly and yearly summaries. In the monthly summary below the daily table, the line headed "TOTAL" gives the sum of the daily figures. The line headed "MEAN" gives the average flow in cubic feet per second during the month. The lines headed "MAX" and "MIN" give the maximum and minimum daily discharges, respectively, for the month. Discharge for the month also may be 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 regulation or diversion, if the drainage area includes large noncontributing areas, or if the average annual rainfall over the drainage basin is usually less than 20 inches. In the yearly summary below the monthly summary, the figures shown are the appro­ priate daily discharges for the calendar and water years. Footnotes to the table of daily discharge are introduced by the word "NOTE." Footnotes are used to indicate periods for which the discharge is computed or estimated by special methods because of no gage-height record, backwater from various sources, or other unusual conditions. Periods of no gage-height record are indicated if the period is continuous for a month or more or in­ cludes the maximum discharge for the year. Period of backwater from an unusual source, or indefinite stage-relation, or of any other unusual condi­ tion at the gage site are indicated only if they are a month or more in length and the accuracy of the records is affected. The methods used in computing discharge for various unusual conditions have been explained in preceding paragraphs. Data collected at partial-record water-quality stations follows the informa­ tion for continuous-record sites. Data for partial-record discharge stations are presented in one table. This table shows the annual maximum stage and discharge at crest-stage stations. Accuracy of field data and computed results The accuracy of streamflow data depends primarily on (1) the stability of the stage-discharge relation or, if the control is unstable, the frequency of dis­ charge measurements, and (2) the accuracy of observations of stage, measure­ ments of discharge, and interpretations of records. The station description under "REMARKS" states the degree of accuracy of the records. "Excellent" means that about 95 percent of the daily discharges are within 5 percent; "good," within 10 percent; and "fair" within 15 percent. "Poor" means that daily discharges have less than "fair" accuracy. Figures of daily mean discharge in this report are shown to the nearest hundredth of a cubic foot per second for discharges of less than 1 cu ft/s; to tenths between 1.0 and 10 cu ft/s; to whole numbers between 10 and 1,000 cu ft/s; and to 3 significant figures above 1,000 cu ft/s. The number of signifi­ cant figures used is based solely on the magnitude of the figure. The same rounding rules apply to discharge figures listed for partial-record stations. 22 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 Other data available Information of a more detailed nature than that published for most of the gaging stations such as observations of water temperatures, discharge measure­ ments, gage-height records, and rating tabl.,s is on file in the district office. Also, most gaging-station records are available in computer-usable form and many statistical analyses have been made. Information on the availability of unpublished data or statistical analyses may be obtained from the district office. Access to WATSTORE Data The National WATer Data STOrage and REtrieval System (WATSTORE) was estab­ lished 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 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 EXPLANATION OF WATER-QUALITY RECORDS Collection and examination of data Surface-water samples for analyses usually are collected at or near gaging stations. The quality-of-water records are given immediately following the discharge records at these stations. The descriptive heading for water-quality records gives the period of record for all water-quality data; the period of daily record for parameters that are measured on a daily basis (sediment discharge); extremes for the period of daily record; extremes for the current year; and general remarks. For ground-water records, no descriptive statements are given; however, the well number, date of sampling/and or other pertinent data are given in the table containing the chemical analyses of the ground water. 23 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 Water analysis Most methods for collecting and analyzing water samples are described in the U.S. Geological Survey Techniques of Water-Resources Investigations. One sample can define adequately the water quality at a given time if the mixture of solutes throughout the stream cross sections 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 representative sample needed for an accurate mean concentration and for use in calculating load. 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 possi­ ble, consistent with available sampling techniques and methods of analysis. In the rare case where an apparent inconsistency exists between a reported pH value and the relative abundance of carbon dioxide species (carbonate 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. Water temperature Water temperatures were measured at all water-quality stations on the Celcius scale. In addition, temperatures were taken during discharge measurements for water-discharge stations. Degrees Celsius can be converted to degrees Farenheit as shown in table 3. Large streams have a small daily 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. Table 3.--Conversion of Temperature Scales Degrees Celcius (°C) to Degrees Farenheit (°F) °C °F °C °F °C °F 15.0 59 21.0 70 27.0 81 15.5 60 21.5 71 27.5 82 16.0 61 22.0 72 28.0 82 16.5 62 22.5 72 28.5 83 17.0 63 23.0 73 29.0 84 17.5 64 23.5 74 29.5 85 18.0 64 24.0 75 30.0 86 18.5 65 24.5 76 30.5 87 19.0 66 25.0 77 31.0 88 19.5 67 25.5 78 31.5 89 20.0 68 26.0 79 32.0 90 20.5 69 26.5 80 F = 9/5 (°C) + 32 or * °C = 5/9 (°F - 32) 24 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 Sediment Suspended-sediment concentrations are determined from water-sediment samples collected by using depth-integrating or automatic sediment 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 concentration, 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 loads of suspended sediment were estimated on the basis of water discharge, sediment concentrations 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 period­ ically may represent conditions only at the time of observations, such data are useful in establishing seasonal relations between quality and streamflow in predicting long-term sediment-discharge characteristics of the stream. In addition to the records of the amounts of suspended sediment, records of the periodic measurements of the particle-size distribution of the suspended sediment are included. EXPLANATION OF GROUND-WATER LEVEL RECORDS Collection of the data 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. 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 6. Measurements are made in many types of wells, under varying conditions of access and at different temperatures; hence, neither the method of measurement nor the equipment can be standardized. At each observation well, however, the equipment and techniques used are those that will ensure that measurements at each well are consistent. WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1984 Water-level measurements in this report are given in feet with reference either to mean sea level (msl) or land-surface datum (lsd). Mean sea level is the datum plane on which the national network of precise levels is based; land-surface datum is a datum plane that is approximately at land surface at each well. If known, the altitude of the land-surface datum is given in each well description. The height of the measuring point (M.P.) above or below low-surface datum is given in each well description. Water levels in wells equipped with recording gages are reported for every day. 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 in 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 or a few hundredths of a foot. For lesser depths to water the accuracy is greater. Accordingly, most measurements are reported to a hun­ dredth of a foot, but some are given only to a tenth of a foot or a large unit. 25 Surface and Quality-of-Water Records for Puerto Rico 67°1 67°00 45' 30' 66°00' 45' 65°30' OCEANO ATLANTIC° 6, 40 Nfo 0 $0 0 e c, ce 1/0 4 0 q ° '4) 4Z,db be z' 0 18°30' 0157 0114 3af° 4c 3a5 Rio Culebrina 112 os. 0284**027750 480 Rio Guayabo 1478 Rio Grande, 32 0870 I). • < 4 :1148( 666x)Rio Fajardo 0360 0818 1440 34 0 \, 0250 \ *071 Rio Grande 05!,40 0 '5\ ea 15' de Arlasco 0108) 14 1 '056 A0584 Rio Yaguez 14 6' 141 0 8 Rio Daguao 0558502 Quebrada Palma Rio Guanafibo 1 1360 1300 c„,1,428.4 0430A_LT0530504 051:_3, \ Rio Santiago I . l\- -2. Rio Blanco 16 05118 Rib Antall Ruiz •Rio Humacao 28 0' AS064, ;A128950 .7 Rio Guayana's :/\44.!9015 1800' 12 Ai121119 0 60 o 0csP Nc '0 4. 0,o „x4 00 14 EXPLANATION o4 3° 40 =1/0 4 41* ' .fe' 0 ik 1'10 % ) % (Z."' 4'4), SURFACE WATER STATIONS 0.0 0 An26 CONTINUOUS STREAMFLOW 4,‘ 17°45' O 10 20 30 KILOMETERS STATION r I O 10 20 MILES M1411 LAKE-ELEVATION STATION MAR CARIBE Figure 6.--Location of continuous surface-water stations in Puerto Rico. 67°15' 18030' Rio Culebrina Rio Guayabo Rio Grand Rk Grand'4' de Anasco 15' ft Rio Yagu Rio Guano/lb° 13 1800 1704 0 10 20 1- 0 10 67°00' 4 15' 66000' OCEANO ATLANTIC° t, o 0" Crt,S° IP b° ts 60 , ,% 0391 4,0 so.s 6, 00 600- e oct ‘ ,' 0o• so V z e 9 cp 6, ,N0 . 0 0395 4753 9...: p /170480 ' .i, 41. 9820 •4851 0470 00 *649 V-05 - IF" 31r0,59 \038320 ? 17',8 0 0358 „) t 0 t8 059 04414'- LTh 0588 044950 "54 0575 _, ...18525 0307 q *0478, 0430,,,,, 039954 ,f03-9 129,7 ' ‘ .1 ? it X ..., o o /P °. Ao to,„z,1,v A9 00 060 4,4 f• + OUALIT A 0 0 0 0 Clvso •s,3 0 S 0 10 b t 0 4.so 4§ 14, P CAP Oe V.0430 ' 4 ' p oto i% V 0820 30 KILOMETERS -V 0710 20 MILLS V-0910 MAR CARIBE Figure 7.--Location of water-quality stations in Puerto Rico. 4 65°30' cfr e , 0 eep Rib Fajardo Daguao Quebrada Palma Rio Santiago Rib Blanco Rib Anton Ruiz Rib Humacao Rio Guayan6 PLANATION Y-OF-WATER STATIONS BIOLOGICAL CHEMICAL SEDIMENT (DAILY) SEDIMENT (.BI-MONTHLY) 1 NO 0475.25 0475.04 18'15' 18-oce 66'00' 65°45' SAN JUAN 0496 0493.10 0485.10 15 0610 602 66 0638. 0 06 665 0690 0693.50 0 2 0.{5.40 Fajardo to Fajardo 0584 0570.15 0554.10 •553.1• 0566 a gua 0565.50 29 0527 0535 0775 0776 0735 eib 32 073 0511.40 0785.10 RIO Anton Ruiz Are HOMNIC10 0845 0857 0872 0650 0651 20 KILOMETERS 20 MILES A EXPLANATION SURFACE WATER STATIONS 0825 LOW-FLOW STATION /1159 CREST-STAGE GAGING STATION Figure 8.--Location of low-flow partial-record stations in Eastern Puerto Rico. 67°15' 67°00' 45' 30' 15' 6e.0o' 45' 65°30' OCEAN° ATLANTICO o siv i(4. A 6,4z'' 4Z 0 0 tr> i `.,0 0 C§ 4, 1 0 . 0 i? 6 N" e , 0 18°30' N q 0 ?° \)' (07 ko 4rk 4z, 41/4' Rio Culebrinas ,z,,p Rio Guayab Rio Grand Rio Fajardo R`to GrancMT IS de A fiasco Rio Yagu Rio Daguao Rio Guanailbo Quebrada Palma \ Rio Santiago R( Blanco Rib Anton Ruiz Rib Humacao Rto Guayands 18000'E a, 9,F 4irk, ‘0, \ tta 00 4$`# 4e4 sP 01? 0, .,??P• ,„ o -,5' 4, o 42, 00 N eq'Z' '° 4e '00 1% e 17°45' 0 10 20 30 KILOMETERS —H 0 10 20 MiLtS MAR CA RISE Figure 9.--Location of low-flow partial-record stations in Central and Western Puerto Rico. 33 OCEANO ArLANTICO 0070 \7",t1/4 ISABELA 01144e QUEBRADILLAS de Diversioh • 1 64 AGUADILLA • 165 112 0110 010790 Drainage boundaries indeterminate in limestone terrone Liuga,ocloeco 010720 Urnestone Igneous sedimentary rocks 0106 \s"- "\"\JL ARES Rio C. • f not , btn ( c`l : 0 PE(o Grisnd. Miasma W*0, '• EXPLANATION A0106 SURFACE—WATER STATION AND NUMBER V 0105 QUALITY—OF—WATER STATION AND NUMBER • 164 WELL AND WELL NUMBER Mop area vavourez %stow 61.1 40Astt ° FA C44104#,, ParfiCE r aliklethita 2 3 4 5 3 C? 4 7 xiLOIMET S 6 MILES Figure 10.--Rio Guajataca basin. 34 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 (km 32.9), 0.1 mi (0.2 km) upstream from Quebrada An6n, and 0.4 mi (0.6 km) northeast of Lares plaza. DRAINAGE AREA.--3.16 sq mi (8.18 sq km). PERIOD OF RECORD.--Water years 1958-71, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI- SIRED- SPE- DTS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- 7,4 !JR- OXYGEN, (PER- ICAL 0.7 KF AGAR INISTAN- DUCT- (STAND- TEMPER- 5:0- DIS- CENT (HIGH 0M-MF (COLS. TIME TANEOUS ANCE ARD ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMMOS) UNITS) (DEG C) (NTU) (4G/L) ATION) (MS/L) 100 ML) 100 ML) OCT , 1933 23... 1140 10 214 1.0 23.0 2.Z i.9 95 16 K6900 6100 DEC 23... 1110 4.0 224 7.6 21.5 35 9.) 105 15 41000 7700 FE1 r 1934 03... 0740 2.3 226 7.5 19.5 1./ 7.1 •O 15 K16000 3300 APR 13... 1640 .45 275 3.3 26.) 1.1 9.1 116 12 3400 560 JUN 21... 1110 12 213 3.1 23.0 11 9.4 111 <10 3000 2500 AUG 16... 1345 11 223 3.0 24.5 1.0 7.3 07 13 21000 5300 HARD- mAr;NE- SODIUM POTAS- ALKA - CHLO- FLUO- HARD- NESS, CALCIUM SLUM, SODIUM, AD- SLUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- DIS- DIS- SORP- 015- FIELD DIS- DIS- DIS- (MG/L SONATE SOLVED SOLVED snLvED TzoN SOLVED oicaL SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CACO3) CAC03) AS CA) AS MA AS NA) AS <) CACO3) AS SO4) AS CL) AS F) OCT , 1933 28... 71 0 23 5.1 11 .6 2.1 30 6.0 10 <.10 DEC 23... 35 FEB , 1934 03... -- .... 9C - - APR 13... 100 0 70 6.6 14 .6 1.8 105 15 13 .33 JUN 21... - -- 79 AUG 16... 84 2 26 4.5 3.3 .4 2.7 82 13 10 .13 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA 4' NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+403 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS NI) AS N) AS N) AS N) AS N) AS N) OCT , 1983 29... 23 130 2.6 3 2.1 .03 2.1 .17 .63 .80 2.9 DEC 23... -.. -- 68 1.7 .02 1.7 .16 .94 1.0 2.7 FE3 , 1934 03... --.. 6 .97 .03 1.0 <.01 .60 1.6 APR 18... 27 170 .21 4 <.01 .20 .03 .77 .30 1.0 JUN 21... -- 12 -- <.01 1.9 .01 <.10 AUG 16... 23 140 4.2 22 <.01 1.9 <.01 .10 2.0 K = non-ideal count RIO GUAJATACA BASIN 50010500 RIO GUAJATACA AT LARES, PR - -Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- 3ARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV­ TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS 3A) AS CO) AS CR) AS P8) AS HG) AS SE) AS AG) OCT , 1983 28... 13 .05 1 100 1 <1 3 <.1 <1 <1 DEC 23... 12 .07 FEB , 1984 08... '.1 .10 APR 18... 4.4 .05 2 <100 1 <1 <1 .1 <1 <1 JUN 21... .06 AUG 16... 8.9 .11 35 36 RIO GUAJATACA BASIN 50010600 RIO GUAJATACA ABOVE LAGO DE GUAJATACA, PR LOCATION.--Lat 18°19'57", long 66°55'29", Hydrologic Unit 21010002, 125 ft (38.1 m) off road 451, 3 mi (4.8 km) south of Lago de 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 to September, 1984. GAGE.--Water-stage recorder. REMARKS.--Records fair. EXTREMES FOR CURRENT PERIOD.--Peak discharges above base 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) Aug. 15 1600 1,700 48.1 10.41 3.173 Sept. 15 1445 1,670 47.3 10.35 3.155 Sept. 13 1645 *1,910 54.1 10.82 3.298 Minimum discharge, 7.1 cu ft/s (0.201 cu m/s) Aug. 7. DISCHARGE, IN CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 25 9.0 82 2 18 9.3 58 3 16 8.2 100 4 60 20 73 5 200 10 65 6 35 9.0 56 7 25 7.5 36 22 48 28 3 20 18 24 10 100 9.7 21 11 70 13 158 12 46 14 71 13 28 103 292 14 22 193 204 15 21 322 357 16 18 102 195 17 16 51 263 18 16 34 163 19 22 31 90 20 17 26 94 21 15 19 61 22 15 32 48 23 15 24 73 24 12 18 47 25 12 16 38 26 12 107 52 27 10 80 47 28 18 39 65 29 15 25 63 30 31 11 9.2 20 64 46 --- TOTAL 941.2 1481.7 2970 MEAN 30.4 47.8 99.0 MAX 200 322 357 MIN 9.2 7.5 21 AC-FT 1870 2940 5890 WATER QUALITY RECORDS PERIOD 0= RECORC. --AUGUST TO SEPTEMBER 1984 RATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOWs SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS OUCTA10E TjRE DATE TIME INSTANTANEOUS DUCTANCE STREAmFLO4r SPECIFIC CON- TE1PERA- TURF. (CFS) (UMC3) (CEG C) (CFS) (UMHOS) (DEG C) AUG, 08 1328 9.7 71d 75.5 37 RIO GUAJATACA BASIN 50011000 CANAL PRINCIPAL DE DIVERSIONES AT LAGO DE GUAJATACA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°24'02", long 66°55'27", off Highway 476 at Lago Guajataca outlet, 3.0 mi (4.8 km) southwest of Segunda Unidad Baldorioty de Castro, and 5.3 mi (8.5 km) south of Quebradillas Plaza. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1958-64, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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- 310- OIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1933 31... 1420 50 303 7.3 26.0 11 6.5 83 30 54 56 DEC 23... 1235 65 386 7.5 26.0 1.1 8.2 103 25 K65 72 FEB , 1984 10... 0840 58 273 7.8 25.0 1.1 7.3 96 <10 K109 K180 MAY 11... 1435 60 283 3.4 23.0 1.1 9.2 119 <10 K1 Kl JUL 05... 1650 60 333 7.6 25.0 1.1 2.0 25 <10 82 K170 AUG 20... 1415 45 310 7.7 26.0 .80 3.0 38 <10 K120 160 HARD- MAGNE- SOOIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- DES- DES- SORP- DIS- FIELD DIS- DIS- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT , 1983 31... 150 8 53 3.4 5.3 .2 1.6 139 10 7.6 .20 DEC 23... 180 -... FEB , 1984 ..... 10... - 125 MAY 11... 130 9 46 4.2 6.5 .3 1.6 127 13 9.6 .20 JUL 05... - 139 AUG 20... 140 4 49 3.3 5.7 .2 1.7 134 15 9.1 .10 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 31... 6.4 170 23 10 .02 <.10 .32 3.1 3.4 DEC 23... 1 <.01 .60 <.01 .50 1.1 FEB , 1984 10... 8 <.01 <.10 <.01 .60 MAY 11... 6.8 160 26 4 <.01 <.10 .27 2.2 2.5 JUL 05... -- 1 <.01 .40 <.01 .30 .70 AUG 20... 7.0 170 21 4 <.01 <.10 .17 .23 .40 RIO GUAJATACA BASIN 50011000 CANAL PRINCIPAL DE DIVERSIONES AT LAGO DE GUAJATACA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELF- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERA3LE ERA8LE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L (MGJL (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS 8A) AS CO) AS CR) AS P8) AS HG) AS SE) AS AG) OCT , 1983 31... .31 1 (100 1 <1 3 <.1 <1 <1 DEC 23... 4.9 .02 FEB , 1984 10... .05 MAY 11... <.01 2 <130 2 <1 <1 .1 <1 <1 JUL 05... 3.1 .01 - AUG 20... <.01 K = non-ideal count 38 39 RIO GUAJATACA BASIN 50011200 RIO GUAJATACA BELOW LAGO GUAJATACA, PR LOCATION.--Lat 18°24'01", long 66°55'40", Hydrologic Unit 21010002, on left bank, 250 ft (76.2 m) downstream from bridge on Highway 476, 1,000 ft (305 m) downstream from outlet tunnel, and 5.2 mi (8.4 km) southeast of Quebradillas. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--August 1969 to December 1970, April to September 1984. CAGE.--Water-stage recorder. Altitude of gage is 535 ft (163 m), from topographic map. REMARKS.--Records fair. 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, 590 cu ft/s (16.7 cu m/s) Sept. 18, 1984, gage height, 9.94 ft (3.030 m), from rating curve extended above 400 cu ft/s (11.3 cu m/s) on basis of step-backwater analysis; minimum, 0.53 cu ft/s (0.015 cu m/s) May 31, June 1, 1984. EXTREMES FOR CURRENT PERIOD.--Maximum discharge, 590 cu ft/s (16.7 cu m/s) Sept. 18; minimum, 0.53 cu ft/s (0.015 cu m/s) May 31, June 1. DISCHARGE, IN CUBIC FEET PER SECOVD. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES OAT OCT NOV DEC JAN FEE MAR APR MAY JUN JUL AUG SEP 1 .97 .77 1.3 1.6 1.2 2 .99 1.1 1.6 1.3 1.0 3 .97 .94 1.3 5.5 .94 4 .88 1.1 1.1 1.1 .90 5 .88 1.1 2.2 1.1 1.6 6 .91 1.2 1.5 1.0 .94 7 .91 1.3 1.2 1.0 .95 8 .92 1.2 1.3 1.0 .91 9 .92 1.0 1.6 1.1 .87 10 .92 1.2 1.2 4.7 .88 11 .91 1.4 1.3 .90 1.3 12 .91 .98 .99 1.9 1.6 13 .89 2.5 1.1 3.1 1.3 14 .85 1.7 .90 1.3 1.5 15 .82 1.3 1.1 1.0 2.3 16 .86 1.2 1.4 .94 2.1 17 1.1 1.4 1.1 .92 8.2 18 1.8 1.9 1.1 .94 171 19 1.1 4.2 1.0 .98 492 20 1.2 1.9 1.0 .94 438 21 1.8 1.5 .86 .92 400 22 2.0 1.5 1.0 .96 385 23 1.6 1.3 1.3 .90 385 24 1.3 1.5 2.0 1.1 235 V-- 25 .95 1.3 1.7 1.7 1.0 2.0 26 .95 1.5 1.5 1.7 .94 2.6 27 .92 1.8 1.4 1.3 .90 2.1 28 .92 1.3 1.4 .95 .90 2.2 29 .91 1.3 1.4 1.2 1.0 40 30 .94 1.3 1.1 1.5 .92 2.4 ...... 31 .79 --- 1.2 .90 --- TOTAL 35.70 43.69 40.00 42.76 2585.79 MEAN 1.15 1.46 1.29 1.38 86.2 MAX 2.0 4.2 2.2 5.5 492 MIN .79 .77 .86 .90 .87 AC-FT 71 87 79 85 5130 WATER QUALITY RECORDS PERIOD OF RECORD.--APRIL TO SEPTEMBER 1934 WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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) APR, 25 1535 0.9 346 26.0 AUG, 08 1045 1.0 390 27.5 MAY, 30 1232 1.2 401 27.0 40 RIO GUAJATACA BASIN 50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR LOCATION.--Lat 18°28'31", long 66°57'46", Hydrologic Unit 21010002, on left bank at ford 1.7 mi (2.7 km) upstream 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 de Guajataca. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February to May 1969 (monthly measurements only), July 1969 to December 1970, April to September 1984. GAGE.--Water-stage recorder. Altitude of gage is at mean level from topographic map. REMARKS.--Records fair. Flow regulated by Lago de Guajataca 6.6 mi (10.6 km). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 3,090 cu ft/s (87.5 cu m/s) Sept. 19, 1984; minimum discharge, 6.2 cu ft/s (0.176 cu m/sec) Sept. 4, 9-12, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges above base of 1,000 cu ft/s (28.3 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Sept. 19 0300 *3,090 87.5 8.10 2.469 Minimum discharge, 6.2 cu ft/s (0.176 cu m/s) Sept. 4, 9-12. DISCHARGE. IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 7.1 6.8 8.4 7.6 6.8 2 7.3 7.8 8.6 8.4 6.6 3 7.3 8.2 9.1 8.2 6.5 4 7.3 8.1 9.7 8.8 6.6 5 7.4 11 86 8.2 6.6 6 7.7 19 27 8.1 6.4 7 7.7 14 12 8.1 6.9 8 7.5 14 9.9 8.0 6.6 9 7.7 12 9.6 7.8 6.4 10 7.7 12 9.1 7.8 6.3 11 7.8 10 9.7 8.0 6.2 12 7.7 9.3 8.6 7.8 9.0 13 7.4 8.9 8.3 7.6 8.1 14 7.4 30 8.2 9.2 7.9 15 7.4 12 8.2 9.2 29 16 7.4 10 8.6 8.7 52 17 - 7.5 11 8.5 8.1 170 18 18 75 8.2 8.2 580 19 16 145 8.0 9.0 1900 20 22 21 7.7 8.7 500 21 99 10 7.1 8.5 199 22 57 9.8 6.9 8.8 96 23 --- 14 9.7 7.3 8.4 129 24 8.4 9.8 10 7.7 8.7 90 25 8.5 8.9 9.5 9.0 8.2 20 26 8.5 19 9.1 8.3 7.9 30 27 8.6 31 9.1 8.3 7.7 20 28 8.6 11 8.9 7.3 7.4 25 29 8.9 11 8.6 7.3 7.1 70 30 14 9.2 8.7 7.1 7.2 25 31 --- 8.3 --- 7.5 7.0 --- TOTAL 461.5 538.5 357.2 252.4 4031.9 MEAN 14.9 18.0 11.5 8.14 134 MAX 99 145 86 9.2 1900 MIN 7.1 6.8 6.9 7.0 6.2 AC-FT 915 1070 709 501 8000 41 RIO GUAJATACA BASIN 50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI*.' STREP.. SPE- OIS•• DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM.... FECAL, FECAL, FLOW, CON- PH TJR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- 810- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMMOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT • 1983 31... 1225 13 484 7.5 25.0 1.2 7.2 87 30 K150 250 DEC 23... 1030 3.9 480 7.3 24.5 3.4 6.9 82 19 56 140 MAR , 1984 09... 1040 8.4 603 7.9 24.0 .80 12.6 149 <10 $(12 52 MAY 11... 1220 7.6 550 8.2 27.0 <1.0 9.9 123 <10 K30 K2 JUL 05... 1355 124 354 S.3 24.5 27 7.7 92 <10 K1100 3500 AUG 20... 1930 8.5 559 2.0 26.0 .30 10.4 128 <10 74 K140 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO.". HARD- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- DIS- DIS- SORP- On- FIELD DIS- DIS- On.* (MG/L 80NATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CACO3) CACO3) AS CA) AS MG) AS NA) AS 0 CAC03) AS SO4) AS CL) AS F) OCT , 1983 31... 220 18 77 7.3 15 .5 1.1 207 8.6 27 .10 DEC 28... -- 208 •. 0 .0 MAR , 1934 09... 228 MAY 11... 240 41 30 13 22 .6 1.0 226 7.3 41 .10 JUL M. 00 05... --. 154 AUG 20... 220 0 73 9.1 20 .6 1.2 258 9.6 38 .10 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO-. NITRO- NITRO- NITRO- GEN,A4- DI5- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO"' SOLVED TUENTS, SOLVED DEG. Co NITRATE NITRITE NO24-NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PEN3E3 (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MGM AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1933 31... 6.4 270 9.4 4 2.0 .02 2.0 .27 .23 .50 2.5 DEC 28... <1 2.1 .03 2.1 .06 .64 .70 2.3 MAR , 1934 ..... 09... -- 5 -- <.01 2.4 <.01 1.0 3.4 MAY 11... 6.6 290 6.0 1 <.01 2.1 .34 1.8 2.1 4.2 JUL 05... 34 <.01 .70 <.01 .80 1.5 ..... ..... AUG 20... 6.4 310 7.1 1 <.01 1.8 <.01 .10 1.9 K = non-ideal count 42 RIO GUAJATACA BASIN 50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR--Continued WATER-QUAIITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- BARIUM. CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- RHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM. RECOV- TOTAL TOTAL TOTAL ERAELE ERABLE ERA8LE ERABLE ERABLE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS R) AS AS) AS SA) AS CO) AS CR) AS PS) AS 4G) AS SE) AS AG) OCT , 1983 31... 11 <.01 1 <100 1 21 2 <.1 <1 <1 DEC 28... 12 .02 MAR , 1934 09... 15 <.31 MAY 11... 19 (.01 1 <100 2 3 <1 .1 <1 <1 JUL 05... 6.6 .02 AUG 20... 3.4 <.01 STRE4MFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) JUN. 19 0851 94 263 26.5 APR, 24 1320 8.8 550 25.5 I 43 OCEANO ATLANTIC 0 • aHATILLO CAMUY DOUEBRADILLAS 0158 ARECIBO 0157 0148 Drainage boundaries indeterminate in limestone terrone .Bayaney River underground Limestone Igneous and LARES sedimentary rocks Ri(),?.ojatac Rio Tononio'. Rio Grand. de UTUADO a Arecibo basin Rio Grande* Drainage boundary 'Masco oasis EXPLANATION A 0158 LOW—FLOW STATION AND NUMBER A0148 SURFACE—WATER STATION AND NUMBER \--Mop area CAN .Aawatoi0 •ARECI. MJAn00. CAOUA3. 6 7KILOMETERS • UAYANA 6MILES Figure 11.--Rio Camuy basin. 44 RIO CAMUY BASIN 50014800 RIO CAMUY NEAR BAYANEY, PR LOCATION .--Lat 18°23'48", long 66°49'04", Hydrologic Unit 21010002, on left bank at Highway 488, 1.4 mi (2.2 km) southeast of school at Santiago, 0.9 mi (1.4 km) northwest from Escuela Manuel A. Rivera at Bayaney and 9.1 mi (14.6 km) upstream from Atlantic Ocean. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--May to September, 1984. GAGE.--Water-stage recorder. Altitude of gage is 330 ft (100 m), from topographic map. REMARKS.--Records fair. EXTREMES FOR CURRENT PERIOD.--Peak discharges above base 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) June 21 2045 1,400 39.6 9.82 2.993 Sept. 15 1815 1,100 31.2 8.92 2.719 Sept. 4 2000 1,380 39.1 9.77 2.978 Sept. 18 2315 *2,040 57.8 11.53 3.514 Sept. 13 1945 1,800 51.0 10.93 3.331 Minimum discharge, 38 cu ft/s (1.076 cu m/s), Aug. 10, 11. DISCHARGE. IN CUBIC FEET PER SECOND, MATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 64 57 42 89 2 55 55 42 78 3 53 53 41 121 4 130 54 42 336 5 220 111 45 296 6 79 87 42 195 7 67 65 41 97 8 61 55 40 93 9 59 52 43 94 10 105 52 39 75 11 75 77 38 216 12 64 102 52 265 13 58 70 62 504 14 55 56 84 456 15 56 55 281 546 16 52 52 159 490 17 51 50 75 793 18 88 49 57 822 19 250 55 56 450 20 115 72 79 300 21 300 53 52 200 22 --- 256 50 52 160 23 236 130 55 49 170 24 149 86 49 46 220 25 193 124 47 44 130 26 114 112 46 49 130 27 162 79 45 117 210 28 128 73 45 79 140 29 81 66 52 55 270 30 76 61 45 50 230 31 62 --- 44 50 --- TOTAL 3044 1810 2003 8176 MEAN 101 58.4 64.6 273 MAX 300 111 281 822 MIN 51 44 38 75 AC-FT 6040 3590 3970 16220 WATER QUALITY RECORDS PERIOD CF RECORD.--JUNE TO SEPTEMBER 1184 WATER-QUALITY DATA, WATER YEAR OCTOBER 1783 TO SEPTEMBER 1984 STREAMFLOW. SPECIE': CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURF DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) ('U CS) (DEG C) (C=S) (UMMOS) (DEG C) JUN. 13 1320 09 2'9 27.5 SEP, 06 1152 194 322 AUG, 15 1179 153 306 24.0 24.0 45 RIO CAMUY BASIN 50015700 RIO CAMUY NEAR HATILLO, PR LOCATION.--Lat 18°27'44", long 66°49'56", Hydrologic Unit 21010002, 1.8 mi (2.90 km) southwest of Hatillo plaza, and 1.8 mi (2.9 km) southeast of Camuy plaza, 1.2 mi (1.9 km) south of Planta de Purificaci6n, and 3.3 mi (5.5 km) upstream from Atlantic Ocean. DRAINAGE AREA. - -Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--June to September 1984. GAGE.--Water-stage recorder. Altitude of gage is 15 ft (5.0 km), from topographic map. REMARKS.--Records fair. EXTREMES FOR CURRENT PERIOD.--Peak discharges above base of 1,800 cu ft/s (51.0 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) June 21 2315 1,810 51.2 13.16 4.011 Sept. 19 unknown *3,000 85 Unknown Sept. 13 Unknown 2,200 62 Unknown Minimum discharge, 42 cu ft/s (1.19 cu m/s) July 10, Aug. 6. DISCHARGE. IN CUBIC FEET PER SECOND• WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 63 52 100 2 60 52 90 3 56 51 130 4 58 51 400 5 119 56 350 6 117 51 203 7 78 51 122 8 62 49 90 9 56 53 119 10 54 52 83 11 76 50 186 12 122 61 380 13 80 69 700 14 63 70 400 15 60 350 300 16 56 258 500 17 55 83 1000 18 --- 54 61 1100 19 294 52 50 600 20 163 84 84 361 21 273 61 52 263 22 465 56 50 193 23 169 62 56 200 24 105 55 54 267 25 115 53 52 156 26 155 52 50 160 27 89 52 150 253 23 81 52 80 164 29 73 61 60 326 30 68 53 50 278 31 --- 52 50 --- TOTAL 2034 2358 9474 MEAN 65.6 76.1 316 MAX 122 350 1100 MIN 52 49 83 AC-FT 4030 4680 18790 WATER CjALITY RECORDS PERIOD OF RECORD.--AUGUST TO SEP7Fm3ER 1984 MATE;­ UALITY DATA, MATER YEAR OCTOBER 1983 TO SEPTEMBER 19E4 STREAMFL04, SPECIFIC CON- TEMP RA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME :NSTANTANEOUS CUCTANCI TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (jM40S) (DIG C) (CFS) ('JMHOS) (DEG C) AUG, 14 1416 36 311 ?5.5 SEP, 07 0626 126 336 24.5   47 OC AT-0 A, 0 HATILLO Colic boron. ARECibt 0290 BARCELONE TA 0135 • •161 284 • 027750 . Bayaney . Florida Drainage boundaries indeterminate in limestone t err ane 027250 ipr 027090 Logo Dos Boer 025110 r Limes,ane 250 igneous and sedimentary rocks \. 0280 R+b Comuy • basin ar L ugo Coonillo UT'UAfl0 :0 ti 02605. ./ C 4r 0 cx L090 SY . 123 YUYA 61. cx rotuyb L ago Perejo$ 0 1.ego ) :2 ..40fontes Gronde de S 0205 Ada.c.o basin 86 -6 ..ADJUNTAS Drainage boundary e,cand ot;sin Rio ea,irt Drainage "undwY7\„0050 Rta Per te9ue's EXPLANATION .1. 090 besEn Island divide ,— Of YOS ,„„, A 0284 SURFACE—WATER STATION AND NUMBER 0205 QUALITY—OF—WATER STATION AND NUMBER Ria Guayenitt Tallobon basin ° beam i • 161 WELL AND WELL NUMBER • ?-l Map area SA* Ailitt LAOWith., A Fa..PARDe AYAGS,t 6 iKiLOMETERS C461...% 4 6 i/i F.'.$ itAYA, Figure 12.--Rio Grande de Arecibo basin. 48 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. DRAINAGE AREA.--12.7 sq mi (32.9 sq km) this does not include 6.0 sq mi (15.6 sq km) above Lago Garzas. PERIOD OF RECORD.--Water years 1969-74, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, =LOW, CON- PH TiP- OXYGEN, (PER- ICAL 0.7 <F AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DI5- CENT (HIGH UM-M= (COLS. TIME TANEOUS ANCE ARO ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MGIL) ATION) (MG/L) 100 ML) 100 ML) OCT , 1933 26... 1515 23 500 7.9 27.0 13 7.0 93 44 5800 8600 DEC 19... 1625 15 375 1.0 24.0 4) '.4 93 13 7300 2503 fEi , 1984 07... 0730 11 317 7.6 19.5 1.3 3.0 90 <10 K12000 4700 APR 17... 0945 6.8 452 3.3 22.5 1.2 3.9 103 17 2400 890 JUN 20... 0845 17 286 8.1 22.0 63 3.5 102 10 K11000 4700 AUG 15... 0930 10 390 8.0 24.5 ?.5 3.1 102 <10 K12000 K18000 HARD- MANE- SO)IUM POTAS... ALKA- CHLO- FLUID-- HARD- NESS, CALCIUM SLUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- DIS- DIS- SO2P- ()IS- =IEL3 DIS- 015- DIS-• (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) AS CL) AS F) OCT , 1983 25... 110 6 28 9.3 51 2 2.5 104 10 81 <.10 DEC 19... 116 FE8 , 1984 07... -- 115 APR 17... 130 0 32 11 36 1 1.9 125 7.7 58 <.10 JUN 20... 105 AUG 15... 120 0 30 11 25 1 2.1 120 12 40 .10 SOLIDS, SOLIDS, NITRO." SILICA, SUM Of SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO.... NITRO- GEN,AM- DIS- CONSTI- On- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MS/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 26... 29 270 17 24 1.3 .05 1.3 .45 5.6 6.0 7.3 DEC 19... -- 4 .44 .06 .50 .25 .05 .30 .80 FEB , 1984 07... ...... 5 1.2 .12 1.3 .16 .64 .80 2.1 APR 17... 29 250 4.6 4 .45 .05 .50 .06 .54 .60 1.1 JUN 20... -- 155 .84 .06 .90 .14 .26 .40 1.3 AUG 15... 29 220 5.9 11 .57 .13 .70 .35 .35 .70 1.4 K = non-ideal count 49 RIO GRANDE DE ARECIBO BASIN 50020500 RIO GRANDE DE ARECIBO NEAR ADJUNTAS, PR WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984--Continued DATE NITRO- GEN, TOTAL (MG/L AS NO3) PHOS­ PHORUS, TOTAL (MG/L AS P) ARSENIC TOTAL (UG/L 4S AS) 8ARIJM, TOTAL RECOV­ ERA3LE (UG/L AS 3A) CADMIUM TOTAL RFCOV­ ER ABLE (UG/L AS CO) CHRO­ MIUM, TOTAL RECOV­ ERABLE (UG/L AS CR) LEAD, TOTAL RECOV­ ERABLE (UG/L AS PB) MERCURY TOTAL RECOV­ ERABLE (UG/L AS MG) SELE- NIUM, TOTAL (UG/L AS SE) SILVER, TOTAL RECOV­ ERABLE (UG/L AS AG) OCT . 1933 26... 32 DEC 19... 3.5 FEB . 1984 07... 9.3 APR 17... 4.9 JUN 20... 5.8 AUG 15... 6.2 .20 .22 .21 .18 .13 .25 1 <1 <103 <133 1 1 7 <1 3 <1 <.1 .1 <1 <1 <1 <1 50 RIO GRANDE DE ARECIBO BASIN 50025000 RIO GRANDE DE ARECIBO NEAR UTUADO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°18'11", long 66°41'59", at bridge near Highway 10 at km 56.4, 0.5 mi (0.8 km)) downstream from Rio de Caguana, and 2.5 mi (4.0 km) north of Utuado plaza. DRAINAGE AREA.--66.0 sq mi (170.9 sq km) this excludes 6.0 sq mi (15.5 sq km) upstream 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 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLT- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- P4 TJR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT-. (STAND- TEMPER- 810- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMMOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV , 1983 02... 1100 97 253 8.0 27.1 75 7.5 95 32 3030 9103 DEC 19... 1343 58 273 8.1 23.0 73 7.6 93 13 20000 2300 cES , 1984 07... 1030 26 265 8.0 21.5 3.9 9.0 103 <10 K120000 6300 APR 16... 1330 18 317 8.3 32.5 3.0 5.5 91 <10 30000 2500 JUN 19... 1520 134 183 8.1 26.5 203 7 .6 0 23 K283000 K140000 AUG 13... 1800 56 297 7.7 2 7 .0 4.0 .5 6 280 K123000 K13000 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RISE, RIDE, NESS NONCAR- DM'. DIS- DIS- SORP- DIS- FIELD DIS- DIS- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L. (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CACO3) CAC03) AS CA) AS MG) AS NA) AS K) C4CO3) AS 504) AS CL) AS F) NOV , 1983 02... 94 10 25 7.7 13 .6 2.1 84 21 12 DEC 19... 89 FES , 1984 07... 89 .... APR 16... 113 12 30 3.9 19 .8 2.6 100 32 16 .10 JUN 19... -- 64 AUG 13... 93 0 24 3.0 20 .9 3.0 98 34 23 .20 SOLIDS, SOLIOS, . NITRO... SILICA, SUM OF SOLIDS, RESIDUE NITRO-. NITRO- NITRO.... NITRO- NITRO- GEN,AM- OIS- CONSTI- DIS- AT 105 GEN, GEN, GEM, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (NM) AS N) AS N) AS N) AS N) AS N) AS N) AS N) NOV , 1983 02... 14 150 33 8 1.4 .05 1.4 .18 .42 .60 2.0 DEC 19... 4 1.5 .04 1.5 <.01 .50 2.0 FEB , 1934 07... -- 6 1.2 .06 1.3 .06 .84 .90 2.2 APR 16... 29 200 9.5 22 .99 .21 1.2 .14 .66 .80 2.0 JUN 19... 2250 .81 .09 .90 .21 .89 1.1 2.0 AUG 13... 21 190 29 10500 .39 .11 1.0 1.7 3.3 5.0 6.0 K = non-ideal count .10 RIO GRANDE DE ARECIBO BASIN 50025000 RIO GRANDE DE ARECIBO NEAR UTUADO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER. NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELF- S'%T 1 GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- MIUM, RECOV- TOTAL TOTAL TOTAL ERA3LE EPABLE ERA3LE EPABLE ERA8LE TOTAL ERA3LE (MS/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS 403) AS P) 4S AS) AS 34) AS CO) AS CP) AS P3) AS HG) AS SE) AS AG) NOV , 1983 OZ... 3.9 .19 1 1C0 <1 9 21 <.1 <1 1 DEC 19... 3.9 .25 FEB , 1)84 37... 9.7 .19 APR 16... 8.9 .48 1 <103 1 2 2 <.1 <1 <1 JUN 19... 3.9 .25 AUG 13... 27 3.7 51 52 RIO GRANDE DE ARECIBO BASIN 50026050 RIO CAONILLAS ABOVE LAGO CAONILLAS NEAR JAYUYA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°13'26", long 66°38'22", 300 ft (91.m) 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 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, CORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TjR- OXYGEN, (PER- ICAL 3.7 KF AGAR INSTAN... DUCT- (STAND- TEMPER- 8I0- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARC ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER • DATE (CFS) CUMNOS) UNITS) (OEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT r 1983 26... 1130 89 153 7.9 24.5 14 7.8 97 14 2100 2100 DEC 20... 0943 31 223 8.1 20.5 25 3.3 100 <10 K630 420 FEI , 1984 0'... 1250 28 206 8.8 23.3 2.1 4.4 113 12 K1100 K1100 APR 17... 1740 15 250 3.8 33.0 13 7.4 101 12 370 950 JUN 14... 0945 65 169 8.2 24.0 14 8.5 134 <10 4300 740 AUG 14... 1830 43 215 3.0 27.0 201 7.7 99 23 K11000 4600 HARD- MANE- SODIUM POTAS- ALKA- CHLO- FLUO••• HARO- NESS, CALCIUM SLUM, SODIUM, AD- SIJM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- CIS- OTS- CIS- SO/P- OIS- ;IELD CIS- CIS* OTS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MS/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L - (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) AS CL) AS F) OCT , 1983 26... 67 6 17 5.9 10 .6 1.5 61 14 9.3 <.10 DEC 20... 77 -­ FEB , 1984 07... - - 73 APR 17... 37 3 23 7.3 13 .6 1.5 35 13 12 <.10 JUN 19... 58 AUG 14... 75 5 19 6.3 12 .6 1.7 71 18 12 .10 SOLIDS, SOLIDS, NITRO'.. SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GN,AM- ()IS- CONSTI- DIS- AT 105 GEN, GEN, GEN, OEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+403 AMMONIA ORGANIC ORGANIC GEN, (MG/L OIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MS/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE 5T02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 26... 24 120 23 22 .93 .02 1.0 .13 2.9 3.0 4.0 DEC 20... 4 <.01 .90 .02 .28 .30 1.2. FE3 , 1984 07... -- 18 <.01 .30 .22 .28 .50 .80 APR 17.... 23 150 6.1 26 .19 .01 .20 .04 .46 .50 .70 JUN 19... 30 -- <.01 .40 .<.01 <.10 AUG 14... 21 130 15 467 .28 .02 .30 .03 .77 .80 1.1 K = non-ideal count 53 RIO GRANDE DE ARECIBO BASIN 50026050 RIO CAONILLAS ABOVE LAGO CAONILLAS NEAR JAYUYA, PR - -Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE NITRO- GEN, TOTAL (MG/L AS NO3) CARD- BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, PMOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL PNORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV­ TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERA3LE TOTAL ERA3LE (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG1L AS P) AS AS) AS 3A) AS CO) AS CR) AS P3) AS MG) AS SE) AS AG) OCT , 1953 26... 13 DEC 20... 5.3 FES , 1784 07... 3.5 APR 17... 3.1 JUN 19... AUG 14... 4.9 .06 .09 .02 .14 .08 .25 1 <1 100 <100 2 1 2 <1 4 1 <.1 <.1 <1 <1 <1 <1 SULFATE DIS- SOLVED (MG/L AS SO4) CHLO- RIDE, DIS- SOLVED (MG/L AS CL) FLUO- RIDE, DIS- SOLVED (MG/L AS F) 54 RIO GRANDE DE ARECIBO BASIN 50027250 RIO GRANDE DE ARECIBO BELOW LAGO DOS BOCAS NEAR FLORIDA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°20'50", long 66°40'02", at pedestrian bridge, 0.7 mi (1.1 km) downstream from Lago Dos Bocas and 6.6 mi (10.6 km) west of Florida plaza. DRAINAGE AREA.--169 sq mi (436 sq km) does not include 6.0 sq mi (15.6 sq km) above Lago Garzas. PERIOD OF RECORD.--Water years 1970-71, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE SPE- STREAM- CIFIC FLOW, CON- INSTAN- DUCT- TIME TANEOUS ANCE (CFS) (UMHOS) PH (STAND- ARD UNITS) TEMPER- ATURE (DEG C) TJR- 310- ITT (NTU) OXYGEN, OXYGEN COLI- STREP- DIS- DEMAND, FORM, TOCOCCI SOLVED CHEM- FECAL, FECAL, OXYGEN, (PER- ICAL 0.7 KF AGAR CENT (HIGH UM-ME (COLS. SOLVED SATUR- LEVEL) (COLS./ PER (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV • 1983 02... 1245 179 178 7.6 20.0 2) DEC 19... 1126 21 206 7.7 25.0 15 FEB , 1984 06... 1615 29 198 7.7 25.5 ?.0 APR 16... 1755 26 222 q.1 26.5 1.1 JUN 18... 1715 725 190 7.6 20.5 4.9 AUG 14... 1015 18 235 7.4 26.5 4.7 5.2 64 34 3100 2900 9.6 116 10 K21 K27 7.4 93 <10 78 42 5.9 36 15 K100 K36 4.3 54 <10 440 4900 2.5 31 11 4500 4500 HARD- MA-,NE- SOOIUM POTAS- ALKA- HARD- NESS, CALCIUM SLUM, SODIUM, A7- SIUM, LINITY NESS NONCAR- DIS- CTS- DIS- SORP- DIS- FIELD (MG/L SINAI! SOLVED SOLVED SOLVED TION SOLVED (MG/L AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) NOV • 1983 02... 66 DEC 19... FEB , 1984 05... APR 16... 77 JUN 18... AUG 14... 82 7 17 5.6 9.9 .6 2.0 2 20 6.5 11 .6 1.9 0 22 6.5 10 .5 2.1 59 12 9.4 <.10 73 -- 74 75 16 11 <.10 73 84 15 12 .10 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM.• DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (NG/L DATE 5102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) NOV , 1933 02... 14 DEC 19... FES , 1984 06... APR 16... 17 JUN 18... AUG 14... 12 110 51 12 -- 3 - - 4 130 9.1 2 - - 6 130 6.3 8 .58 .02 .60 .20 1.3 1.5 2.1 <.01 .70 <.01 .30 1.0 . 28 .02 .30 .08 .32 .40 .70 <.01 <.10 .05 .85 .90 . 13 .02 .20 .09 .01 .10 .30 <.01 <.10 .34 .16 .50 K = non-ideal count 55 RIO GRANDE DE ARECIBO BASIN 50027250 RIO GRANDE DE ARECIBO BELOW LAGO DOS BOCAS NEAR FLORIDA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE NITRO- GEN, TOTAL (MGIL AS NO3) PHOS- PHORUS, TOTAL CMG/L AS P) ARSENIC TOTAL (UG/L AS AS) 3ARIUM, TOTAL RECOV­ ERA3LE (UG/L AS 3A) CADMIUM TOTAL RECOV­ ERABLE CUG/L AS CD) CHRO­ MIUM, TOTAL RECOV­ ERAILE (UG/L AS CR) LEAD, TOTAL RECOV­ ERABLE CUG/L AS P8) MERCURY TOTAL RECOV­ ERABLE (UG/L AS HG) SELE­ NIUM, TOTAL (UG/L AS SE) SILVER, TOTAL RECOV­ ERABLE CUG/L AS AG) NOV 1983 02... 9.3 DEC 19... 4.4 FEB • 1984 06... 3.1 APR 16... JUN 18... 1.3 AUG 14... .02 .23 .03 .02 .02 .05 1 1 <100 <100 <1 1 25 <1 3 <1 <.1 .1 <1 <1 <1 <1 56 RIO GRANDE DE ARECIBO BASIN 50027750 RIO GRANDE DE ARECIBO ABOVE ARECIBO, PR LOCATION.--Lat 18°25'29", long 66°41'44", Hydrologic Unit 21010002, 0.8 mi (1.3 km) above Rio Tanamg, 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) below 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. Altitude of gage is 30 ft (9.1 m), from topographic map. REMARKS.--Records fair. Flow regulated by Lago Dos Bocas Dam 10.2 mi (16.4 km) upstream. EXTREMES FOR WATER YEARS 1983-84.--Peak discharges above base of 4,300 cu ft/s (122 cu m/s) and maximums (*): 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) Sept. 13, 1982 0700 9,310 264 13.05 3.978 Sept. 13, 1984 2400 *5,920 168 10.53 3.210 Apr. 21, 1983 1100 *7,730 219 11.95 3.642 Minimum daily discharges, 46 cu ft/s (1.30 cu m/s) Apr. 13, 1983; 37 cu ft/s (1.05 cu m/s) May 15, 1984. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1981 TO SEPTEMBER 1982 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 517 790 367 66 530 2 261 640 385 59 855 3 522 220 125 49 153 4 458 720 46 44 90 5 163 530 46 51 141 6 125 270 590 356 86 7 221 950 1230 247 880 8 279 510 511 70 514 0 108 570 286 541 733 10 644 661 186 430 651 11 565 523 271 994 644 12 964 121 148 253 178 13 580 75 72 333 4510 14 1560 70 134 295 1760 15 848 65 350 133 971 16 202 60 238 328 1150 17 314 60 225 434 1640 18 172 58 204 216 1340 19 270 66 282 407 1160 20 424 135 533 418 644 21 550 200 531 81 816 22 300 112 245 55 498 23 350 60 102 299 119 24 710 55 236 340 143 25 390 118 142 90 213 26 410 86 162 350 136 27 230 127 620 332 254 28 --- 500 141 592 282 365 29 150 522 255 579 424 684 30 333 133 618 299 344 251 31 --- 590 --- 89 377 --- TOTAL 13882 8916 9826 8698 22109 MEAN 445 297 317 281 737 MAX 1560 950 1230 994 4510 MIN 108 55 46 44 86 CFSM 2.24 1.49 1.59 1.41 3.69 IN. 2.53 1.66 1.83 1.62 4.11 AC-FT 27530 17650 19490 17250 43850 57 RIO GRANDE DE ARECIBO BASIN 50027750 RIO GRANDE DE ARECIBO ABOVE ARECIBO, PR--Continued DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1982 TO SEPTEMBER 1983 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 1000 426 145 156 539 93 76 260 114 150 239 209 2 260 243 187 466 87 86 232 399 87 69 81 173 3 200 375 84 605 54 82 144 191 689 91 63 55 4 150 249 391 335 58 284 183 323 417 185 62 153 5 510 163 192 420 118 81 54 695 222 875 640 281 6 490 369 534 562 89 54 55 838 456 759 117 512 7 420 239 852 264 293 110 261 109 388 814 70 522 8 190 355 627 171 182 131 274 169 418 788 420 77 9 80 482 635 211 51 212 476 568 478 282 536 176 10 250 235 389 613 290 272 72 763 517 572 573 123 11 280 454 523 709 203 189 86 499 420 86 191 122 12 80 685 153 203 174 304 142 491 207 86 297 106 13 420 1460 380 375 57 802 46 1730 499 58 450 450 14 370 797 365 167 55 689 197 1590 458 115 273 738 15 220 782 220 80 119 94 179 978 602 96 286 103 16 70 1640 380 72 169 154 91 343 253 70 284 427 17 120 679 281 434 271 285 138 322 544 223 462 920 18 340 703 151 762 164 258 246 531 695 344 329 313 19 680 834 134 645 190 344 188 1610 655 234 166 663 20 620 274 242 530 300 816 75 1700 758 189 109 943 21 111 249 602 560 352 341 4040 1090 116 475 333 780 22 559 740 395 355 86 187 1880 610 251 422 633 267 23 319 627 195 339 157 462 1680 2330 71 76 352 68 24 362 762 147 660 432 85 1370 1210 625 164 115 50 25 391 1790 73 133 164 227 595 1480 230 100 126 49 26 208 1160 103 127 271 111 114 1140 263 777 58 127 27 294 678 1450 195 133 145 92 1710 328 95 228 557 28 179 1030 908 272 203 75 124 692 490 233 297 920 29 489 818 658 178 --- 313 632 522 470 158 559 497 30 499 170 1010 207 357 247 647 456 117 426 86 31 355 --- 474 399 84 --- 1060 --- 74 580 --- TOTAL 10516 19468 12880 11205 5261 7727 14059 26600 12177 8777 9155 10472 MEAN 339 649 415 361 188 249 469 858 406 283 302 349 MAX 1000 1790 1450 762 539 815 4040 2330 758 875 640 943 MIN 70 163 73 72 51 54 46 109 71 58 58 49 CFSM 1.70 3.25 2.08 1.81 .94 1.25 2.35 4.29 2.03 1.42 1.51 1.75 IN. 1.96 3.62 2.40 2.08 .98 1.44 2.61 4.95 2.26 1.63 1.74 1.95 AC-FT 20860 38610 25550 22230 10440 15330 27890 52760 24150 17410 18560 20770 WTR YR 1983 TOTAL 148497 MEAN 407 MAX 4040 MIN 46 CFSM 2.04 IN 27.62 AC-FT 294500 58 RIO GRANDE DE ARECIBO BASIN 50027750 RIO GRANDE DE ARECIBO ABOVE ARECIBO, PR--Continued DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 49 968 136 97 835 63 49 112 528 136 72 79 2 62 903 789 66 254 353 32 54 254 391 509 96 3 45 261 452 123 192 126 523 42 54 366 591 974 4 151 992 277 53 195 172 102 41 228 90 100 1190 5 208 494 212 573 66 248 55 39 123 142 76 361 6 73 1080 245 100 73 52 464 63 713 72 104 750 7 74 950 120 53 48 488 74 219 1420 60 52 253 8 105 1050 170 50 96 66 54 166 711 48 212 112 9 78 1090 93 79 51 679 114 -124 282 47 91 166 10 64 892 459 563 238 263 485 69 306 183 50 330 11 307 1260 163 632 51 283 536 221 246 56 55 729 12 821 1330 459 403 41 391 88 60 426 351 56 929 13 198 621 87 202 42 339 636 57 231 315 401 1910 14 59 989 59 100 696 45 459 40 645 74 563 2810 15 78 339 161 138 166 42 298 37 520 51 91 1380 16 306 683 83 127 397 40 240 38 85 328 451 1540 17 834 797 94 105 495 40 160 343 52 79 134 1830 18 1110 746 106 49 66 38 54 446 281 226 504 2310 19 1400 744 369 57 64 63 54 904 591 397 137 2430 20 784 310 831 237 295 60 47 225 586 321 61C 1360 21 1190 356 416 157 579 33 111 510 201 70 101 1840 22 615 529 79 284 573 46 436 333 494 47 68 1800 23 1540 184 57 250 388 52 495 871 352 129 62 1760 24 1170 268 65 142 326 40 112 603 152 307 603 1690 25 741 64 115 404 288 158 49 786 1030 74 216 793 26 961 143 93 335 236 172 65 263 1350 410 122 547 27 534 335 150 577 515 287 48 52 533 109 72 512 28 810 582 111 81 291 113 49 206 111 53 99 436 29 337 159 117 47 66 532 99 650 416 48 235 248 30 134 290 118 633 --- 97 127 1290 237 393 357 237 31 271 --- 62 754 51 --- 749 --- 284 336 --- TOTAL 15159 19409 6798 7486 7613 5947 6215 9618 13208 5657 7130 32402 MEAN 489 647 219 241 263 192 207 310 440 182 230 1080 MAX 1540 1330 831 754 835 891 686 1290 1420 410 610 2810 MIN 45 64 57 47 41 33 47 37 52 47 50 79 CFSM 2.45 3.24 1.10 1.21 1.32 .96 1.04 1.55 2.20 .91 1.15 5.40 IN. 2.82 3.61 1.26 1.39 1.42 1.11 1.16 1.79 2.46 1.05 1.33 6.03 AC-FT 30070 38500 13480 14850 15100 11900 12330 19080 26200 11220 14140 64270 CAL YR 1983 TOTAL 146999 MEAN 403 MAX 4040 MIN 45 CFSM 2.02 IN 27.34 AC-FT 291600 WTR YR 1984 TOTAL 136642 MEAN 373 MAX 2810 MIN 37 CFSM 1.87 IN 25.42 AC-FT 271000 WATER QJALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1")82 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1483 TO SEPTEMBER 1”4 STREAMFLOW, SPECIFIC CON- TEMPERA­ STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURF (CFS) (UmmOS) (DEG C) (CFS) (UMMOS) (DEG C) OCT, 04 1119 50 277 27.5 APR, 10 1113 54 250 27.0 NOV, 04 1042 86 237 24.5 MAY, 01 1040 56 232 26.0 DEC, 14 1030 60 220 25.0 JUL, 11 3956 57 227 30.0 JAN, 10 1117 51 282 28.0 AUG, 01 1131 63 270 27.5 FEB, MAR, 21 1107 14 1100 77 45 239 247 24.5 25.5 SEP, 07 1055 103 237 26.5 59 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR LOCATION.--Lat 18°18'02", long 66°46'58", Hydrologic Unit 21010001, on downstream side of left abutment of bridge on Highway 111, 1.2 mi (1.9 km) upstream from natural tunnel, 1.5 mi (2.4 km) northeast of Angeles, and 5.8 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. Datum of gage is 938.32 ft (286.000 m) above mean sea level. Prior to Nov. 17, 1966, non-recording gage and Nov. 17, 1966 to Sept. 30, 1978 recording gage, both at present site and datum 3.00 ft (0.914 m) higher. REMARKS.--Records fair. AVERAGE DISCHARGE.--24 years (1961-84), 48.2 cu ft/s (1.365 cu m/s), 35.57 in/yr (903 mm/yr), 34,920 acre-ft/yr (43.0 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.--Maximum discharge, 8,950 cu ft/s (253 cu m/s) May 17, 1963, gage height, 13.29 ft (4.051 m) datum then in use, from floodmark, from rating curve extended above 500 cu ft/s (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, gage height, 0.12 ft (0.037 m) datum then in use. EXTREMES FOR CURRENT YEAR.--Peak discharges above base of 3,000 cu ft/s (85.0 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) May 22 1630 *3,650 103 12.54 3.822 Minimum discharge, 5.9 cu ft/s (0.167 cu m/s) May 11, 12. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 21 20 19 30 22 46 44 59 153 85 34 35 34 33 32 22 21 21 20 21 18 18 17 17 15 12 12 11 11 10 11 11 10 12 10 7.4 7.4 13 10 7.9 43 38 42 132 176 40 41 47 53 83 31 31 30 36 30 91 170 145 235 133 6 7 B 9 10 55 28 48 41 43 89 148 91 95 156 31 30 30 30 29 20 20 20 38 23 15 15 16 32 33 10 10 10 10 10 10 10 11 11 9.9 6.7 6.8 9.1 9.2 6.7 192 90 63 58 58 35 33 30 26 30 27 26 26 27 25 96 60 67 56 72 11 12 13 14 15 63 58 40 32 70 146 94 74 89 72 29 28 27 28 28 20 20 20 20 23 32 20 23 18 17 9.9 9.7 9.6 9.4 9.3 10 9.9 11 11 9.7 6.8 6.5 9.2 9.5 31 56 107 130 82 56 56 32 24 23 23 27 40 38 27 29 96 105 233 123 104 16 17 18 19 20 85 81 63 42 201 61 56 52 52 48 27 27 27 27 32 25 20 19 19 19 16 15 15 15 14 9.3 12 10 9.4 25 8.9 8.1 8.1 8.3 9.1 77 37 56 36 20 112 85 61 52 47 20 20 31 86 62 27 25 24 50 32 124 188 175 130 155 21 22 23 24 25 90 269 117 75 63 48 45 46 45 42 27 26 25 25 25 18 19 19 19 19 14 13 13 13 13 16 11 10 9.9 15 9.1 9.2 8.3 7.9 7.6 38 260 100 93 80 73 49 42 44 59 52 56 45 40 40 26 31 26 25 46 111 94 85 76 69 26 27 28 29 30 31 55 50 47 75 62 52 40 38 35 35 35 --- 24 23 27 29 28 23 19 19 19 19 19 19 12 12 12 12 --- 11 9.8 9.5 9.4 10 11 9.2 12 12 8.0 7.6 --- 71 104 81 97 85 53 48 45 44 42 39 --- 40 37 42 43 35 31 90 89 49 36 33 54 74 66 75 69 66 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 2017 65.1 269 19 3.54 4.08 4000 2119 70.6 156 35 3.84 4.28 4200 880 28.4 35 23 1.54 1.78 1750 644 20.8 38 18 1.13 1.30 1280 495 17.1 33 12 .93 1.00 982 342.2 11.0 25 9.3 .60 .69 679 290.9 9.70 12 7.6 .53 .59 577 1435.2 46.3 260 6.5 2.52 2.90 2850 2165 72.2 192 38 3.92 4.38 4290 1256 40.5 86 20 2.20 2.54 2490 1113 35.9 90 24 1.95 2.25 2210 3343 111 235 56 6.03 6.76 6630 IN 24.68 AC-FT 24210 MTR YR 1984 TOTAL 16100.3 MEAN 44.0 MAX 269 M/4 6.5 CFSM 2.39 IN 32.55 AC-FT 31930 CAL YR 1983 TOTAL 12207.8 MEAN 33.4 MAX 269 MIN 8.3 CFSN 1.82 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1958 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED SEDIMENT DISCHARGE: January 1968 to current year. REMARKS.--Sediment samples were collected by a local observer on a weekly basis and during high flow events. Estimates for period of missing daily record were made from a sediment transport curve developed from a period of record of 10 years. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATIONS: Maximum daily mean, 20,400 mg/L November 27, 1968; minimum daily mean, 0.0 mg/L during many years. SEDIMENT LOADS: Maximum daily, 110,000 tons (100,000 tonnes) November 27, 1968, minimum daily, 0.0 ton (0.0 tonne) during many years. EXTREMES FOR CURRENT YEAR.-- SEDIMENT CONCENTRATIONS: Maximum daily mean, 1,300 mg/L Oct. 22, 1983; minimum daily mean, 1.0 mg/L several days during water year 1984. SEDIMENT LOADS: Maximum daily, 4,290 tons (3,890 tonnes) Oct. 22, 1983; minimum daily, 0.02 ton (0.02 tonne) several days during water year 1984. WATER-QUALITY DATA, WATER YEARS OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLT- STREP- SPE- DIS- DEMAND, FORM. TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW. CON- PH TJR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- CIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARC ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1933 12... 1140 39 146 7.9 22.5 12) 3.0 95 32 42000 68000 DEC 20... 1355 25 172 1.2 22.0 2.5 3.5 104 <10 670 400 FE3 , 07... 1934 1650 15 162 3.6 22.0 1.9 3.3 104 34 <10 550 APR 13... 1100 8.2 187 8.7 25.0 5.1 9.0 112 13 K82 K2700 JUN 20... 1610 46 170 8.2 25.0 7.6 3.4 105 <10 270 500 AUG 15... 1 725 26 172 9.0 25.0 3.2 3.1 101 <10 5700 530 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS NESS, NONCAR- CALCIUM DIS- SIUM, DIS- SODIUM, 01S- AO- SORP- SlUM, OIS- LINITY FIELD SULFATE DIS- RIDE. DIS- RIDE. DIS- (MG/L 3ONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CACO3) CACO3) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) AS CL) AS F) OCT , 1933 12... 50 5 13 4.3 6.3 .4 2.3 45 12 6.7 <.10 DEC 20... 57 FEB , 1984 07... 59 APR 18... 68 5 17 6.1 8.9 .5 1.5 63 18 8.1 <.10 JUN 20... 54 AUG 15... 60 4 15 5.5 8.1 .5 1.5 56 17 7.8 .10 SOLIDS, SOLIDS. NITRO- SILICA. SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + SOLVED TUENTS, SOLVED DEG. Cr NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDEO (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) NITRO- GEN., TOTAL (MG/L AS N) OCT , 1983 12... 18 90 9.5 <1 1.1 .03 1.1 .10 .60 .70 1.8 DEC 20... 6 <.01 .70 .04 .16 .20 .90 FEB , 1984 07... 7 <.01 .40 <.01 .40 .80 APR 18... 23 120 2.7 6 <.01 .10 .09 .71 .80 .90 JUN 20... 10 <.01 .70 .01 .89 .90 1.6 AUG 15... 22 110 7.8 8 <.01 .40 <.01 <.10 K = non-ideal count 60 61 RIO GRANDE DE ARECIBO 3ASIN 50028001 RIO TANAMA NEAR UTUADO, PR--Continued WATER-QUALITY DATA', WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE NITRO- GEN, TOTAL (MG/L AS NO3) PHOS­ PHORUS. TOTAL (MG/L AS P) CHRO- BARIUM. CADMIUM MIUM. LEAD, MERCURY TOTAL TOTAL TOTAL TOTAL TOTAL SELE - ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM. TOTAL ERABLE ERABLE ERA3LE ERABLE ERABLE TOTAL (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS AS) AS BA) AS CO) AS CR) AS PB) AS HG) AS SE) SILVER, TOTAL RECOV- ERABLE (UG/L A5 AG) OCT . 1983 12... 8.0 DEC 20... 4.0 FEB , 1984 07... 3.5 APR 18... 4.0 JUN 20... 7.1 AUG 15... .11 .04 .03 .02 .02 .02 2 1 200 <100 3 1 25 3 2 <1 <.1 <.1 <1 <1 <1 <1 DATE TIME STREAMFLOW. SPECIFIC CON- TEMPERA- INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (OEG C) STREAMFLOW. SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) NOV, JAN. 02 1230 10 1039 45 26 153 139 24.0 21.5 MAY, 01 1925 JUL, 09 1436 7.5 26 145 157 24.0 25.5 DATE TEMPER- TIME ATURE (DEG C) SEOI- SERI- SED. SED. SED. MINT, MENT. SUSP. SUSP. SUSP. STREAM- SUS - SUS- FALL FALL FALL FLOW, PENDED PENDED DIAN. DIAN. DIAM. INSTAN- CONCEN- OIS- ): FINER X FINER I FINER TANEOUS TRATION CHARGE THAN THAN THAN (CFS) (MGM (T/DAY) .002 MM .004 MM .003 MM OCT . 1983 22... 1710 22... 1725 22... 1750 MAY . 1984 16... 1700 16 1715 16... 1730 22... 1630 22... 1645 22... 1700 22... 1730 JUNE 04... 1710 04... 1725 04... 1755 13... 1630 13... 1645 13... 1715 SEPT 05... 1555 13... 1605 13... 1645 13... 1655 13... 1710 13... 1725 21.5 21.5 21.5 21.5 21.5 21.5 20.0 20.0 21.0 29.0 22.0 -- -- 21.5 21.5 21.5 -- 21.5 21.0 21.0 21.5 21.5 1150 1400 1183 377 338 295 2670 2590 2060 1160 1500 1450 642 805 628 405 130 766 689 1670 1551 1160 4710 5070 5250 8340 7230 5690 9200 1)700 11430 9420 9340 7650 8370 5860 52 50 6340 4070 4360 5530 10800 3380 5480 14600 22900 16700 8490 6500 5330 66300 74800 57300 29500 39900 29900 14500 12700 8900 E930 1430 9120 10300 48700 35100 20300 18 15 15 10 5 11 6 6 9 13 8 12 13 9 9 7 10 11 11 5 6 9 28 23 24 21 11 22 13 15 19 19 14 13 18 15 15 13 17 13 18 7 9 12 40 32 34 33 18 29 22 23 28 27 20 25 25 24 22 21 a 20 27 11 14 18 62 RIO ;;RANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUACO, PR--Cantinued WATER—QUALITY DATA, WATER YEAR 0:TOBER 1983 TO SEPTEMBER 1984 SED. SED. SED. SED. SED. SED. SED. SUSP. SUSP. SUS°. SUSP. SUSP. SUSP. SUSP. FALL FILL SIEVE SIEVE SIEVE SIEVE SIEVE DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. 1 'INER I FINER % FINER X FINER % FINER 1 FINER I FINER THAN THAN THIN THA4 THAN THAN THAN DATE .016 MM .031 MM .362 MM .125 MM .250 MM .500 MM 1.00 MM OCT • 1933 22... 59 78 33 75 97 98 99 22... 43 68 56 97 93 99 103 22... 55 32 93 96 99 100 100 MAY ,1984 15... 47 54 92 95 97 90 100 16... 32 47 15 R9 94 98 100 15... 44 60 91 95 97 99 103 22... 33 46 86 .13 93 99 100 22... 32 43 85 91 97 99 100 22... 40 50 81 93 07 99 100 22... 33 53 75 37 95 98 99 JUN 04... 23 39 65 78 92 97 99 04... 36 50 84 93 98 99 100 04... 34 47 71 36 95 98 99 13... 37 51 71 38 97 99 100 13... 36 54 76 38 95 98 99 13... 30 46 65 32 91 96 93 SEP 05... 45 66 81 90 96 98 100 13... 31 43 55 74 89 96 100 13... 40 55 61 32 93 98 100 13... 17 27 47 70 39 96 99 13... 23 35 53 59 87 96 99 13... 24 43 60 76 91 96 97 63 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO. PR--Continued WATER-QUALITY DATA. WATER YEAR OCTOBER 1933 TO SEPTEMBER 1984 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) CMG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 21 16 .91 46 94 11 34 57 5.3 2 20 14 .76 44 120 17 35 56 5.1 3 19 12 .62 59 146 25 34 54 4.9 4 30 40 3.2 153 578 306 33 48 4.2 5 22 18 1.1 85 276 72 32 46 3.9 6 55 225 98 39 292 119 31 44 3.7 7 28 65 4.9 148 696 917 30 40 3.2 8 48 134 45 91 295 79 30 44 3.7 9 41 78 11.3 45 316 109 30 42 3.5 10 43 92 11 156 771 1290 29 38 3.0 11 63 172 29 146 612 432 29 37 2.9 12 58 116 32 94 328 96 28 32 2.3 13 40 94 12 74 216 44 27 30 2.2 14 32 53 4.9 39 273 35 28 32 2.3 15 70 241 103 72 241 53 28 32 2.3 16 85 298 173 61 176 31 27 30 2.2 17 81 277 97 56 140 21 27 30 2.2 18 63 202 43 52 126 18 27 30 2.2 19 42 94 11 52 126 18 27 29 2.0 20 201 731 2060 48 112 15 32 66 11 21 90 318 98 48 113 15 27 42 3.5 22 269 1300 4290 45 103 13 26 26 1.8 23 117 555 239 46 103 13 25 24 1.6 24 75 322 100 45 101 12 25 24 1.6 25 63 176 31 42 93 11 25 24 1.6 26 55 140 21 40 78 8.3 24 21 1.3 27 50 120 16 38 68 6.8 23 18 1.1 28 47 108 14 35 60 5.7 27 43 3.8 29 75 247 100 35 53 5.4 29 39 3.2 30 62 232 51 35 58 5.4 28 32 2.4 31 52 148 25 --- --- --- 23 20 1.2 TOTAL 2017 7727.69 2119 3903.6 830 95.2 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) CMG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY =E3RUARY MARCH 1 22 18 1.1 18 10 .49 12 4 .13 2 21 16 .91 18 8 .37 12 4 .13 3 21 16 .91 17 7 .31 11 2 .06 4 20 14 .76 17 7 .28 11 2 .04 5 21 16 .91 15 5 .20 10 1 .03 6 20 14 .76 15 5 .20 10 1 .03 7 20 14 .76 15 5 .20 10 1 .03 8 20 14 .76 16 9 .41 10 1 .03 9 38 72 7.4 32 59 12 10 1 .03 10 23 23 1.5 33 62 6.9 10 1 .03 11 20 13 .69 32 63 6.8 9.9 1 .03 12 20 12 .62 20 16 .96 9.7 1 .03 13 20 13 .69 23 19 1.2 9.6 1 .03 14 20 13 .69 18 11 .56 9.4 1 .03 15 28 45 7.9 17 7 .31 9.3 1 .02 16 25 34 3.1 16 6 .23 9.3 1 .02 17 20 14 .76 15 5 .20 12 2 .04 18 19 12 .62 15 5 .18 10 2 .05 19 19 12 .62 15 4 .15 9.4 1 .03 20 19 11 .55 14 4 .15 25 55 11 21 18 10 .49 14 4 .13 16 11 .82 22 19 11 .55 13 3 .11 11 2 .04 23 19 12 .62 13 3 .11 10 2 .04 24 19 13 .69 13 3 .11 9.9 1 .03 25 19 12 .62 13 3 .09 15 12 1.1 26 19 12 .62 12 2 .06 11 5 .20 27 19 12 .62 12 2 .06 9.8 5 .12 28 19 11 .55 12 2 .06 9.5 5 .12 29 19 10 .49 12 2 .06 9.4 1 .03 30 19 10 .49 --- --- --- 10 2 .04 31 19 10 .49 11 2 .06 TOTAL 644 38.24 495 32.89 342.2 14.42 64 RIO GRAN)E DE 4RECIBO BASIN 50028000 RIO TANANA NEAR UTUA00. PR-Continued WATER-QUALITY DATA. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN MEAN MEAN MEAN CDNCEN- 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 11 2 .06 7.4 1 .02 43 92 11 2 11 2 .04 7.4 1 .02 38 70 7.2 3 10 2 .04 13 12 1.1 42 90 12 4 12 2 .06 10 2 .07 132 558 1060 5 10 2 .04 7.9 1 .02 176 695 459 6 10 1 .03 6.7 1 .02 192 814 1090 7 10 1 .03 6.8 1 .02 90 230 70 8 11 2 .08 9.1 2 .10 63 178 31 9 11 2 .35 9.2 2 .05 58 152 24 10 9.9 1 .03 6.7 1 .02 58 152 24 11 10 1 .03 6.8 1 .02 56 138 22 12 9.9 1 .03 6.5 1 .02 107 416 379 13 11 2 .05 9.2 2 .04 130 598 642 14 11 2 .05 9.5 1 .03 82 257 62 15 9.7 1 .03 31 86 40 56 144 22 16 8.9 1 .02 77 268 149 112 422 296 17 8.1 1 .02 37 79 11 85 266 66 18 8.1 1 .02 56 248 157 61 156 28 19 8.3 1 .02 36 74 10 52 134 19 20 9.1 1 .02 20 15 .86 47 110 14 21 9.1 1 .02 38 91 17 73 234 101 22 9.2 1 .02 260 1100 3620 49 126 18 23 8.3 1 .02 130 338 104 42 90 10 24 7.9 1 .02 93 333 144 44 84 10 25 7.6 1 .02 30 243 62 59 149 29 26 9.2 1 .04 71 226 75 48 116 16 27 12 3 .10 104 362 165 45 109 14 28 12 1 .03 31 247 64 44 104 13 29 8.0 1 .02 97 337 138 42 36 9.7 30 7.6 1 .02 85 269 70 39 74 7.7 31 --- --- 53 132 19 --- --- --- TOTAL 290.9 1.06 1435.2 4847.41 2165 4556.6 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATIDN DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER 1 40 76 8.0 31 42 3.5 91 323 137 2 41 82 9.0 31 42 3.5 170 675 1610 3 47 109 15 30 37 2.9 145 554 336 4 53 129 20 36 61 6.5 235 936 2390 5 83 271 81 30 47 4.2 133 464 171 6 35 64 6.4 27 29 2.0 96 302 88 7 33 52 4.6 26 26 1.8 60 158 26 8 30 40 3.4 26 42 3.6 67 199 45 9 26 24 1.6 27 42 3.6 56 152 25 10 30 70 8.0 25 23 1.5 72 213 67 11 56 171 62 27 35 2.8 96 363 131 12 32 59 6.7 40 38 12 105 342 125 13 24 19 1.2 38 96 14 233 1090 2000 14 23 29 2.2 27 32 2.4 123 418 147 15 23 30 2.3 29 41 3.4 104 337 101 16 20 14 .76 27 35 2.7 124 451 224 17 20 12 .62 25 28 2.0 188 789 618 18 31 53 10 24 21 1.3 175 636 315 19 86 298 188 50 138 36 130 453 167 20 62 168 30 32 58 6.4 155 554 257 21 52 134 20 26 26 1.8 111 368 113 22 56 151 29 31 27 1.9 94 292 74 23 45 101 12 26 27 1.9 85 252 57 24 40 78 8.4 25 23 1.5 76 222 45 25 40 80 8.7 46 115 39 69 196 37 26 40 72 7.4 90 356 197 74 218 49 27 37 66 6.5 89 297 96 66 200 38 28 42 84 10 49 125 19 75 225 48 29 43 96 12 36 64 6.3 69 204 39 30 35 54 5.0 33 48 4.2 66 180 32 31 31 42 3.5 54 141 43 --- --- --- TOTAL 1256 583.28 1113 527.7 3343 9512 YEAR 16100.3 31850.09 65 RIO GRANDE DE ARECIBO BASIN 50028400 RIO TANAMA AT CHARCO HONDO, PR LOCATION.--Lat 18°24'52", long 66°42'52", on right bank at abandoned power house at Charco Hondo, 1.5 mi (2.4 km) upstream from mouth, and 4 mi (6 km) south of Arecibo. DRAINAGE AREA.--57.6 sq mi (149.2 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--April 1969 to June 1971, October 1981 to current year. GAGE.--Water-stage recorder. Altitude of gage is 60 ft (18 m), from topographic map. REMARKS.--Records fair. Diversion 0.8 mi (1.3 km) upstream for municipal supply of Arecibo. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 4,120 cu ft/s (117 cu m/s) Apr. 21, 1969, gage height, 12.22 ft (3.725 m) from floodmark, from rating curve extended above 1,000 cu ft/s (28 cu m/s); minimum, 21 cu ft/s (0.595 cu m/s) Apr. 27, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges above base of 2,000 cu ft/s (56.6 cu m/s), revised, and maximums (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Oct. 20 1645 *2,320 65.7 10.55 3.216 Minimum discharges, 21 cu ft/s (0.595 cu m/s) Apr. 27. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 46 47 46 48 55 104 104 109 298 258 67 67 66 63 62 48 47 46 45 47 36 37 36 36 36 30 31 29 28 29 30 28 29 30 31 30 29 30 41 32 71 69 71 182 339 55 54 54 71 110 49 48 48 52 56 134 253 260 391 224 6 7 8 9 84 98 148 133 128 296 208 157 63 62 60 59 45 45 44 81 35 35 34 38 29 23 28 23 27 27 26 27 29 29 23 35 447 329 126 109 74 57 55 55 48 47 46 47 189 112 86 103 10 87 227 58 53 62 28 26 30 149 54 46 85 11 12 13 14 15 90 95 78 55 82 235 169 143 151 120 59 57 57 56 55 47 45 45 47 44 60 54 44 43 37 27 27 26 27 29 29 29 29 30 30 30 30 31 35 30 86 140 192 134 84 76 87 57 53 57 45 56 76 60 53 139 180 390 313 248 16 115 100 54 63 37 27 29 130 129 50 68 295 17 18 127 182 92 87 53 53 46 42 35 34 31 33 28 29 98 84 142 91 48 47 59 50 535 621 19 143 85 52 41 33 29 26 130 91 120 57 344 20 403 84 52 41 33 23 25 58 80 116 77 294 21 375 83 61 40 33 51 26 62 97 67 52 219 22 23 383 213 106 82 54 51 40 40 32 33 36 42 26 27 308 213 96 70 71 73 55 49 178 147 24 124 78 50 39 32 34 27 175 60 59 46 125 25 123 85 49 40 31 32 26 179 73 55 49 105 26 115 74 49 39 31 41 22 106 103 52 95 95 27 28 109 106 71 70 48 48 36 37 31 30 34 33 28 31 192 172 74 63 51 51 173 98 98 94 29 30 31 119 123 106 68 67 --- 49 47 50 37 37 36 30 --- 31 28 28 30 25 --- 122 145 80 59 57 --- 57 51 49 65 57 54 127 108 --- TOTAL 4058 3939 1731 1385 1078 962 833 2723 3813 1986 1881 6492 MEAN 131 131 55.8 44.7 37.2 31.0 27.8 87.8 127 64.1 60.7 216 MAX 403 298 67 81 62 51 31 308 447 120 173 621 MIN 46 67 47 36 30 26 22 28 57 47 45 85 CFSM 2.27 2.27 .97 .79 .65 .54 .48 1.52 2.21 1.11 1.05 3.75 IN. 2.62 2.54 1.12 .89 .70 .62 .54 1.76 2.46 1.28 1.21 4.19 AC-FT 3050 7810 3430 2750 2140 1910 1650 5400 7560 3940 3730 12380 CAL YR 1983 TOTAL 27278 MEAN 74.7 MAX 403 MIN 30 CFSM 1.30 IN 17.62 AC-FT 54110 WTR YR 1984 TOTAL 30881 MEAN 84.4 MAX 621 MIN 22 CFSM 1.47 IN 19.94 AC-FT 61250 WATER QJALITY RECOROS PERIOD OF RECORD.--MARCH 1983 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOW. SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS OUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMMOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT. 04 1413 54 257 25.5 APR, 10 1320 26 273 23.0 NOV, 16 1156 101 242 23.5 MAY, 01 1250 22 276 22.5 DEC. 12 1300 56 262 22.5 JUN, 04 1433 67 251 27.5 JAN. 10 1355 53 258 24.5 JUL, 11 1324 55 233 29.0 FEB, 21 1255 32 259 21.5 AUG. 01 1409 49 282 25.5 MAR, 14 1252 26 272 23.0 SEP, 07 1356 103 229 25.0 66 RIO GRANDE DE ARECIBO BASIN 50029000 RIO GRANDE DE ARECIBO AT CENTRAL CAMBALACHE, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1963-66, 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLT.- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TJR- OXYGEN. (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- SID- On- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV , 1983 03... 1245 202 232 7.6 24.') 3) 7.2 86 12 4610 2200 DEC 08... 1130 128 282 8.1 24.5 4.1 9.0 108 14 3900 3700 FE3 , 1934 06... 1250 103 243 8.4 25.0 1.9 11.4 138 12 K6 70 K70 MAY 04... 1830 78 267 2.6 23.0 1.3 13.4 171 <10 240 K145 JUN 13... AUG 1120 214 200 8.1 27.0 21) 7.8 98 23 22000 41000 01... 1205 111 274 8.3 27.0 9.6 120 K680 K120 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS, CALCIUM SIUM, SODIUM, AO- SIUM. LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- DIS- DIS- SO/P- DIS- FIELD On- DIS- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) NOV • 1983 03... 100 9 33 5.0 8.4 .4 1.6 94 11 9.2 .10 DEC 09... 120 FES 1984 06... 115 MAY 04... 120 7 38 5.6 8.6 .4 .80 111 11 11 .10 JUN 13... 75 AUG 01... 109 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO-. NITRO- NITRO- NITRO- GEN•AM-.. DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. Cs NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN. (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L OWL (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) NOV , 1983 3... 13 140 75 28 <.01 .70 .25 .25 .50 1.2 DEC 08... 24 .58 .02 .60 .06 <.10 FEB r 1984 06... 11 .19 .01 .20 <.01 .60 .80 MAY 4... 12 150 32 2 .19 .01 .20 <.01 .70 .90 JUN 13... 337 .83 .07 .90 .22 .58 .80 1.7 AUG 01... <.01 .33 .04 <.10 K = non-ideal count RIO GRANDE DE ARECIBO BASIN 50029000 RIO GRANDE DE ARECIBO AT CENTRAL CAMBALACHE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CNRO- 3ARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER,' NITRO- P40S- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEM, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERA3LE ERABLE ERAiLE ERASLE ERA3LE TOTAL ERABLE (MWL CMG/L (031L (UG/L (UWL (UG/L (UG/L CUG/L (UU/L (UG/L DATE AS 403) AS ') AS AS) AS 3A) AS CD) AS CR) AS PI) AS MG) AS SE) AS AG) NOV • 1733 3... 5.3 .06 1 <100 <1 3 4 <.1 <1 <1 DEC 38... .06 -- cES • 14i4 06... 3.5 .13 MAY 4... 4.1 .32 1 103 1 <1 1 <.1 <1 <1 JUN 13... 7.5 .33 AUG 01... <.01 67 •• 69 OCEANO BARCELONETA • 71 66 0381 MANATi s G8 0142 Florida 0366' 035950 , Drainage boundary R:-a Grande, de Arecibo basin Canal de Aceitanas and island tonne's 4C Rib Jacoauas Wcs Inaba', basin tz—Marp area ArLANrIr VEGA BAJA VEGA ALTA is Drainage boundaries indeterminate in limestone terrone Limestone igneous and MOROViS sedimentary rocks 0312 Pro Cibuca basin bta'frati', Drainage bounder fil±c de ia Picots basin titiiCooeno basin EXPLANATION A 0350 SURFACE—WATER STATION AND NUMBER V 0307 QUALITY—OF—WATER STATION AND NUMBER • 142 WELL AND WELL NUMBER :),AitTAGIJEZ ilaL0m€TERS "IKC WAY4V4. 6titiLES Figure 13.--Rio Grande de Manati basin. -- 70 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 0 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 years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLT- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TJR- OXYGEN, (PER- ICAL 0.7 Kg AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARO ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMH3S) UNITS) (OEG C) (NrU) (mG/L) ATION) (mG/L) 100 ML) 100 ML) OCT , 1933 13... 1125 5.6 320 0 .3 26.3 5.3 3.0 134 40 K1200 340 DEC 00... 1045 6.1 323 8.3 20.5 1.2 0 .0 105 11 2400 490 MAR , 1944 07... 1455 3.5 310 F.4 25.0 3.1 13.4 169 20 23030 040 MAY 07... 1905 3.4 343 8.3 24.5 2.7 3.3 111 <10 2600 490 JUN 14... 1650 3.9 334 8.5 28.0 5.6 3.0 108 <10 25000 580 AUG 03... 1615 3.1 357 8.4 23.0 .50 9.3 125 <13 420 310 HARD- MASNE- SO3IUM POT4S- ALKA- CHLO- FLUO- HARD- NESS, CALCIUM SLUM, SODIUM, 40- SIJM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- NS- DIS- SORP- 3IS- FIELO DIS- 01S- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CACO3) CAC03) AS CA) AS MG) AS NA) AS 0 CACO3) AS 504) AS CL) AS F) OCT , 1983 13... 130 4 32 12 13 .5 1.7 125 9.2 17 .20 DEC 09... -- 126 MAR , 1984 07... -- 137 MAY 07... 140 0 36 12 15 .6 1.7 141 9.1 14 .20 JUN 14... -- 139 AUG 03... 140 0 36 12 17 .6 2.4 139 16 21 .20 DATE SOLIDS, SILICA, SUM OF DIS- CONSTI- SOLVED TUENTS, (MG/L DIS- AS SOLVED 5IO2) (MG/L) SOLIDS, SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO DIS- AT 105 GEN, GEN, GEN, GEN, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA (TONS SUS- TOTAL TOTAL TOTAL TOTAL PER PENDEO (MG/L (mG/L (MGR. (MG/L DAY) (MG/L) AS N) AS N) AS N) AS N) NITRO­ GEN, ORGANIC TOTAL (MG/L AS N) NITRO- GEN,AM- MONZA + ORGANIC TOTAL (MG/L AS N) NITRO- GEN, TOTAL (MG/L AS N) OCT , 1983 13... 34 190 2.9 2 2.3 .01 2.3 .02 .28 .30 2.6 DEC 09... 18 2.0 .01 2.0 .05 .25 .30 2.3 MAR , 1984 07... -- -- 6 .49 .01 .50 .03 .67 .70 1.2 MAY 07... 33 210 1.9 7 1.3 .02 1.3 .83 .27 1.1 2.4 JUN 14... •••••11. -- -- 10 .99 .01 1.0 .05 .15 .20 1.2 AUG 03... 29 220 1.8 1 2.4 .02 2.4 .08 1.0 1.1 3.5 K s non-ideal count 71 RIO GRANDE DE MANATI BASIN 50030700 RIO OROCOVIS NEAR OROCOVIS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE NITRO- GEN, TOTAL (MG/L AS NO3) PHOS- PHORUS, TOTAL (MG/L AS °) ARSENIC TOTAL (UG/L AS AS) BARIUM, TOTAL RECOV­ ERABLE (UG/L AS BA) CADMIUM TOTAL RECOV­ ERABLE (UG/L AS CO) CHRO­ MIUM, TOTAL RECOV­ ERAPLE (UG/L AS CR) LEAD, TOTAL RECOV­ ERA8LE (UG/L AS 108) MERCURY TOTAL RECOV­ ERAELE (UG/L AS HG) SELE- NIUM, TOTAL (UG/L AS SE) SILVER, TOTAL RECOV­ ERABLE (UG/L AS AG) OCT , 1983 13... 12 DEC 09... 10 MAR , 1984 07... 5.3 MAY 07... 11 JUN 14... 5.3 AUG 03... 15 .36 .31 .22 .41 .42 .77 1 1 100 <100 <1 1 8 <1 1 1 <.1 .3 <1 <1 <1 <1 72 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 left bank, 0.1 mi (0.2 km) downstream from Quebrada Perchas, 0.8 mi (1.3 km) upstream from Rio Sana Muerto, and 2.2 mi (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. Altitude of gage is 440 ft (134.1 m), from topographic map. Feb. 2, 1966 to Apr. 27, 1967, staff gage read twice daily. REMARKS.--Records fair. Public water-supply pumpage, about 300 ft (91 m) above the station, influences low-flow discharges. AVERAGE DISCHARGE.--19 years (1966-84), 103 cu ft/s (2.917 cu m/s), 25.34 in/yr (644 mm/yr), 74,620 acre-ft/yr (92.0 cu hm/yr); median of yearly mean discharges, 103 cu ft/s (2.92 cu m/s), 74,600 acre-ft/yr (92 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 35,000 cu ft/s (991 cu m/s) Oct. 9, 1970, gage height, 20.3 ft (6.19 m), from flood- marks, from rating curve extended above 200 cu ft/s (5.7 cu m/s) on basis of computations of flow over broad-crested weir and indirect measurements of peak flow at 13.5 ft (4.11 m), 16.0 ft (4.88 m) and 20.3 ft (6.19 m); minimum, 4.4 cu ft/s (0.125 cu m/s) Apr. 15, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges above base of 3,500 cu ft/s (99.1 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/s) (cu m/s) (ft) (m) Sept. 11 1730 *24,100 682 12.62 3.846 Sept. 17 1645 3,860 109 5.31 1.618 Minimum discharge, 4.4 cu ft/s (0.125 cu m/s) Apr. 15. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 36 33 29 27 19 15 17 9.7 20 12 8.9 17 2 28 31 40 23 19 13 13 9.4 15 11 15 44 3 28 31 38 23 19 14 10 9.4 15 12 12 14 4 33 585 29 22 20 13 12 8.6 89 13 9.7 64 5 30 367 30 55 20 13 9.7 8.7 105 171 12 93 6 38 112 37 31 20 12 8.7 4.1 111 87 9.9 143 7 27 76 31 30 19 11 8.0 8.8 105 34 8.3 35 8 26 54 29 25 19 9.4 7.9 9.3 108 22 7.5 18 9 26 47 28 31 24 9.4 8.6 8.7 56 18 7.1 17 10 26 97 26 30 27 11 8.3 7.9 50 16 6.5 48 11 26 101 30 27 52 12 8.1 9.1 38 17 6.1 1770 12 27 129 27 26 33 12 7.6 8.0 31 18 6.0 317 13 30 54 25 27 33 12 8.2 17 29 13 24 98 14 28 44 25 24 29 12 8.3 29 27 16 14 68 15 27 39 25 26 24 11 8.3 14 21 17 8.7 43 16 27 34 25 23 30 14 7.5 118 18 14 9.6 34 17 61 33 25 22 30 12 7.8 56 18 12 11 571 14 75 44 27 22 24 12 8.3 73 18 12 8.3 371 19 33 35 26 21 24 11 7.2 114 21 11 6.3 438 20 46 32 24 21 24 10 7.7 113 23 11 5.7 219 21 60 31 33 21 22 9.7 8.3 37 78 11 5.8 232 22 121 30 26 21 20 9.4 8.6 36 134 11 8.3 102 23 120 31 28 21 20 9.6 8.6 42 31 13 7.5 69 24 79 31 25 22 20 10 8.0 89 21 12 5.7 57 25 42 33 23 23 18 8.6 7.2 44 18 10 9.1 41 26 49 30 22 22 18 8.3 7.2 33 16 16 13 33 27 32 28 24 21 18 43 15 26 14 13 14 30 28 27 28 23 23 18 18 37 21 13 14 14 27 29 30 23 29 19 17 13 23 19 13 21 8.4 35 30 34 31 25 19 12 13 26 13 12 7.2 43 31 58 --- 31 19 12 --- 30 --- 9.5 11 --- TOTAL 1330 2279 865 703 690 392.8 318.1 1042.7 1239 679.5 300.6 5096 MEAN 42.9 76.0 27.9 24.4 23.4 12.7 10.6 33.6 41.3 21.9 9.70 170 MAX - 121 585 40 55 52 43 37 118 111 171 24 1770 MIN 26 28 22 19 17 8.3 7.2 7.9 13 9.5 5.7 14 CFSM .78 1.33 .51 .45 .42 .23 .19 .61 .75 .40 .18 3.08 IN. .90 1.54 .58 .52 .46 .26 .21 .70 .83 .46 .20 3.43 AC-FT 2640 4523 1720 1520 1350 779 631 2070 2450 1350 596 10110 CAL YR 1983 TOTAL 29124.0 MEAN 79.8 MAx 2780 MIN 22 CFSM 1.45 IN 19.63 AC-FT 57780 WTR YR 1984 TOTAL 14990.7 MEAN 41.3 MAX 1770 MIN 5.7 CFSM .74 IN 10.10 AC-FT 29730 -- 73 RIO GRANDE DE MANATI BASIN 50031200 RIO GRANDE DE MANATI NEAR MOROVIS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1968 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN. OXYGEN COLL- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TOR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- 810- PIS- CENT (HIGH JM-MF (COLS. TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) AT ION) (MG/L) 100 ML) 100 ML) OCT , 1983 13... 1515 32 273 8.5 29.0 16 7.1 103 <10 500 730 DEC 09... 1240 27 288 8.4 24.0 5.6 1.9 107 <10 K80 K150 MAR , 1984 07... 1245 11 284 8.6 26.0 3.1 15.2 190 10 K38 K26 MAY 07... 1550 9.4 295 8.9 29.0 3.0 10.9 144 <10 98 K27 JUN 14... 1325 28 279 8.4 30.0 25 9.4 127 <10 K890 260 AUG 03... 1145 13 288 8.4 28.5 6.2 9.2 120 <10 84 250 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- - FLUC- HARO- NESS, CALCIUM SIUM, SODIUM,' AD- SIUM, LINITY SULFATE RIDE. RIDE, NESS NONCAR- DIS- DIS- DIS- SORP- DIS- FIELD DES- OIS- 'DIS- (MG/L EONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) AS CL) AS F) OCT , 1983 13... 110 0 26 1) 12 .5 1.6 108 8.3 15 .20 DEC 09... 116 MAR , 1984 07... 121 MAY 07... 120 0 28 11 14 .6 1.8 122 11 13 .20 JUN 14... -- - 107 ..- AUG 03... 110 0 27 11 13 .5 1.7 119 9.1 16 .10 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS. RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN. MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C. NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN. (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT . 1983 13... 28 170 14 2 <.01 .20 .04 .16 .20 .40 DEC 09... 21 .59 .01 .60 .08 (.10 MAR , 1984 07... 6 <.01 <.10 <.01 .80 MAY 07... 27 180 4.5 6 <.01 <.10 .08 .52 .60 JUN 14... 28 .39 .01 .40 <.01 .20 .60 AUG 03... 26 180 5.7 12 <.01 <.10 .06 .24 .30 K = non-ideal count 74 RIO GRANDE DE MANATI BASIN 50031200 RIO GRANDE DE MANATI NEAR MOROVIS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRD- iARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PHDS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- PECOV- RECOV- RECOV- RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERA3LE EPABLE ERA3LE ERABLE ERA3LE TOTAL ERA3LE (MS/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS 3A) AS CO) AS CR) AS P3) AS HG) AS SE) AS AG) OCT 1933 13... 1. .10 1 <100 <1 10 2 <.1 <1 <1 DEC 09... .09 MAR , 1934 07... .05 MAY 07... .13 2 <100 1 <1 1 <.1 <1 <1 JUN 14... 2.7 .08 AUG 03... .07 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMMOS) (DES C) (CFS) (UMHOS) (DEG C) JAN, 01 1420 27 278 26.3 JUL, 12 1506 17 263 30.0 FEB, 22 1354 20 242 25.5 SEP, 10 1058 14 270 27.9 APR, 30 1449 13 260 23.0 75 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 (15.5 sq km), the runoff from which is diverted through Guineo and de Matrullas reservoirs. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--September 1946 to September 1953, May 1956 to December 1957 (unpublished, available in files of Caribbean District Office and in the National Water Data Storage and Retrieval System, Washington, D.C.); February 1959 to 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. Altitude of gage is 140 ft (42.7 m), from topographic map. Prior to Apr. 1, 1962 , staff gage, read twice daily, at site 100 ft (30.5 m) upstream at same datum. January 1971 to December 1972 at site 1.6 mi (2.6 km) downstream at different datum. REMARKS.--Records fair. AVERAGE DISCHARGE.--24 years (1961-84), 256 cu ft/s (7.250 cu m/s), 27.16 in/yr (690 mm/yr), 185,500 acre-ft/yr (229 cu hm/yr); median of yearly mean discharges, 251 cu ft/s (7.11 cu m/s), 182,000 acre-ft/yr (224 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 125,000 cu ft/s (3,540 cu m/s) Oct. 9, 1970, gage height, 24.0 ft (7.32 m), from floodmark, from rating curve extended above 3,000 cu ft/s (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 m), datum then in use; minimum, 20 cu ft/s (0.566 cu m/s) Apr. 20,21, 1984. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate gage heights of major floods, pointed out by local residents are as follows: August 1899, 50 ft (15.2 m), September 1928, 36 ft (11.0 m), and September 1932, 34 ft (10.4 m) at site 1.6 mi (2.6 km) upstream. EXTREMES FOR CURRENT YEAR.--Peak discharges above base of 7,000 cu ft/s (198 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) Sept. 11 1815 *18,900 535 10.43 3.179 Sept. 17 1730 11,400 323 8.28 2.524 Minimum discharge, 20 cu ft/s (0.566 cu m/s) Apr. 20, 21. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 66 85 67 69 40 51 29 28 53 44 27 64 2 50 79 84 59 40 43 31 28 39 44 30 194 3 54 81 93 55 38 34 28 28 51 44 31 420 4 71 1770 72 55 38 33 43 29 191 47 28 382 5 101 1190 68 145 43 32 33 28 338 219 34 301 6 69 426 74 81 41 31 28 28 346 205 32 373 7 72 270 72 70 38 32 25 27 200 98 27 140 8 63 203 67 65 38 30 24 27 211 67 25 73 9 71 159 66 125 65 30 25 28 125 56 24 52 10 65 397 61 96 61 30 24 27 95 52 22 518 11 96 467 66 75 126 30 24 25 77 48 21 2310 12 114 368 64 67 86 30 26 28 66 47 21 882 13 74 183 61 64 62 30 25 40 54 40 34 458 14 65 147 61 104 58 31 31 89 70 42 40 444 15 263 126 58 69 50 31 29 44 48 45 31 250 16 161 108 55 67 49 32 23 156 42 40 109 506 17 399 93 55 59 53 35 22 129 50 36 38 2280 18 505 139 55 52 46 35 22 274 72 34 28 1610 19 299 103 57 51 43 32 22 266 119 51 23 1590 20 546 87 98 50 42 32 21 202 128 39 21 1050 21 544 83 116 49 41 90 20 69 296 37 21 932 22 977 88 70 47 39 37 23 94 368 36 29 416 23 583 78 64 47 38 32 23 85 135 36 26 255 24 272 75 61 47 36 31 23 139 85 34 21 197 25 140 75 57 48 36 28 22 84 66 31 31 148 26 117 72 56 49 36 23 27 69 60 33 40 144 27 93 67 58 47 36 81 36 94 56 36 114 111 28 83 67 57 44 36 46 58 81 52 29 43 87 29 80 67 63 44 35 33 54 57 47 42 27 108 30 86 65 65 44 --- 30 34 55 47 37 22 102 31 121 ---. 68 42 30 --- 72 --- 30 21 --- TOTAL 6300 7218 2089 1986 1390 1130 855 2430 3587 1679 1041 16397 MEAN 203 241 67.4 64.1 47.9 36.5 28.5 78.4 120 54.2 33.6 547 MAX 977 1770 116 145 126 90 58 274 368 219 114 2310 MIN 50 65 55 42 35 28 20 25 39 29 21 52 CFSM 1.59 1.88 .53 .50 .37 .29 .22 .61 .94 .42 .26 4.27 IN. 1.83 2.10 .61 .58 .40 .33 .25 .71 1.04 .49 .30 4.77 AC-FT 12500 14320 4140 3940 2760 2240 1700 4820 7110 3330 2060 32520 CAL YR 1983 TOTAL 84572 MEAN 232 MAX 8390 MIN 50 CFSM 1.81 IN 24.58 AC-FT 167700 WTR YR 1984 TOTAL 46102 MEAN 126 MAX 2310 MIN 20 CFSM .98 IN 13.40 AC-FT 91440 76 RIO GRANDE DE MANATI BASIN 50035000 RIO GRANDE DE MANATI AT CIALES. PR--Continued WATER QUALITY RECORDS 0ERIOC OE REC04C.--WATER YEARS 1 479 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMMOS) (DEG C) OCT, 03 1317 53 229 30.0 APR, 11 1041 24 259 27.0 NOV, 15 1445 132 229 29.0 APR, 30 1146 33 253 26.5 DEC, 14 1516 60 262 26.5 JUN, 11 1310 72 239 28.5 JAN, 11 0954 74 205 25.0 AUG, 03 1039 33 276 28.0 MAR, 15 1107 31 250 24.5 SEP, 10 1420 43 277 31.0 77 RIO GRANDE DE MANATI BASIN 50035500 RIO GRANDE DE MANATI AT HIGHWAY 149 AT CIALES, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°20'46", long 66°28'06", at bridge on Highway 149, about 800 ft (244 m) upstream from confluence with Rio Cialitos, 0.5 mi (0.8 km) north of Ciales plaza. DRAINAGE AREA.--136 sq mi (352 sq km) this excludes the 6 sq mi (15.5 sq km) upstream from Lago El Guineo and Lago de Matrullas, flow from which is diverted to Rio Jacaguas. PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TJR- OXYGEN, (PER- ICAL - 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARID ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV , 1983 01... 1230 80 233 3.1 26.0 15 9.0 111 16 600 250 DEC 27... 1300 57 248 7.9 25.0 13 8.6 106 32 540 K150 MAR , 1934 05... 1020 38 250 8.5 25.0 5.1 9.8 119 13 K110 K90 APR 33... 1330 36 268 8.7 27.5 2.4 13.1 166 <10 K20 K30 JUN 15... 1215 56 262 8.5 29.5 12 3.5 112 <10 K110 270 AUG 02... 1230 34 263 8.4 23.0 9.0 9.5 121 10 210 220 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- HARO- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- On- DIS- SORP- DIS- FIELD DIS- DIS- DIS- CMG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CACO3) CACO3) AS CA) AS MG) AS NA) AS K) CACO3) AS 504) AS CL) AS F) NOV , 1983 01... 90 0 23 8.0 11 .5 1.7 90 10 13 .40 DEC 27... 96 MAR , 1984 06... 102 APR 30... 110 0 26 9.9 14 .6 1.7 124 13 14 .10 JUN 15... 103 AUG 02... 100 0 25 9.1 12 .5 1.7 105 12 14 .10 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- OIS- AT 105 GEN, GEN, GEN, GEN, GEN. MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENOED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) NOV , 1983 1... 25 150 32 10 .28 .02 .30 .14 4.3 4.4 4.7 DEC 27... 3 -- <.01 .40 .02 1.1 1.1 1.5 MAR , 1984 06... 5 <.01 <.10 (.01 .50 APR 30... 27 180 18 2 <.01 <.10 .09 .31 .40 JUN 15... .29 .01 .30 .04 -- (.10 AUG 2... 25 160 16 8 <.01 <.10 .02 .58 .60 K = non-ideal count RIO GRANDE DE MANATI BASIN 50035500 RIO GRANDE DE MANATI AT HIGHWAY 149 AT CIALES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PtIORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERABLE ERABLE ERA3LE ERABLE ERABLE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS 3A) AS CD) AS CR) AS P13) AS HG) AS SE) AS AG) NOV , 1913 1... 21 .08 1 <100 1 4 1 <.1 <1 <1 DEC 27... 6.0 .07 MAR , 1984 06... .06 APR 30... .11 1 <100 1 <1 1 <.1 <1 <1 JUN 15... .03 AUG 2... .07 78 79 RIO GRANDE DE MANATI BASIN 50035950 RIO CIALITOS AT HIGHWAY 649 AT CIALES, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°20'18", long 66°28'28", 100 ft (30 m) upstream from bridge on Highway 649, 0.7 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 sq km). PERIOD OF RECORD.--Water years 1969-71, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN CCLI- STREP- SPE- 015- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- DECAL, FECAL, =LOW, CON- P4 TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARO ATURE ITT SOLVED SATUR.- LEVEL) (COLS./ PER DATE (CES) (UMHOS) UNITS) (DEG C) (NTU) (1G/L) ATION) (MG/L) 100 ML) 100 ML) NOV , 1933 1... 0945 17 218 3.1 23.0 4.7 3.5 101 21 K730 BSO DEC 27... 1042 13 254 7.8 22.0 12 '3.5 98 13 450 500 MAR , 1934 05... 1325 6.5 235 8.6 24.0 4.0 10.5 125 10 2400 280 APR 3J... 1715 3.9 235 3.8 27.0 3.4 12.4 156 <10 K1060 K1760 JUN 15... 1730 8.9 258 8.4 29.0 21 7.3 95 <13 2600 9100 AUG 2... 1600 5.8 283 8.6 27.0 17 9.9 124 <10 2000 4300 HARD- MAGNE- SODIUM POTAS.... AMA... CHLO- FLUO- HARD- NESS. CALCIUM SLUM, SODIUM. 4C- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- (YTS"' ors- SORP- DIS- FIELD DIS- DIS- DIS- (MG/L SONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) AS CL) AS F) NOV ' 1983 1... 36 1 25 5.7 10 .5 1.7 35 7.4 10 .20 DEC 27... 100 MAR , 1934 06... 103 APR 30... 95 0 27 5.0 11 .5 1.5 98 7.0 11 .10 JUN 15... 104 AUG 2... 110 0 31 7.1 12 .5 1.6 113 9.1 13 .10 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS* CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS.- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDEO (MG/L (013/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) NOV , 1983 1... 26 140 6.3 8 .79 .01 .80 .16 1.3 1.5 2.3 DEC 27... -- 2 <.01 1.0 <.01 .50 1.5 MAR , 1984 06... 6 <.01 .50 .04 .46 .50 1.0 APR 30... 30 150 1.6 5 <.01 .30 .15 .15 .30 .60 JUN 15... 26 .39 .01 .40 .02 .18 .20 .60 AUG 2... 29 170 2.7 30 .19 .01 .20 .04 .26 .30 .50 K = non-ideal count 80 RIO GRANDE DE MANATI BASIN 50035950 RIO CIALITOS AT HIGHWAY 649 AT CIALES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- 3ARIUMr CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GENr PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV 4IUM, RECOV­ TOTAL TOTAL TOTAL ERA3LE ERABLE SlA3LE ERABLE ERA3LE TOTAL ERA3LE (MG/L (MG/L (UG/L (JG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS alt) AS CO) AS CR) AS P3) AS MG) AS SE) AS AG) NOV r 1913 1... 10 .07 1 <100 1 5 2 < . 1 (1 <1 DEC 27... 6.6 .09 MAR r 1964 06... 4.4 .09 APR 30... 2.7 .09 1 <103 1 2 2 <.1 <1 <1 JUN 15... 2.7 .25 AUG 2... 2.2 .09 81 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 sq 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. Altitude of gage is 14 ft (4.3 m), from topographic map. Prior to 1968 crest-stage gage at same site and datum 3.57 ft (1.088 m) lower. REMARKS. - -Records fair. AVERAGE DISCHARGE.--14 years (1971-84), 362 cu ft/s (10.25 cu m/s), 24.95 in/yr (634 mm/yr), 262,300 acre-ft/yr (323 cu hm/yr); median of yearly mean discharges, 312 cu ft/s (8.84 cu m/s), 226,000 acre-ft/yr (279 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 119,000 cu ft/s (3,370 cu m/s) Oct. 9, 1970, gage height, 33.3 ft (10.15 m) from rating curve extended above 15,000 cu ft/s (425 cu m/s) on basis of slope-area measurement of peak flow; minimum, 33 cu 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 m), 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 above base of 9,000 cu ft/s (255 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Sept. 11 2315 *8,550 242 27.36 8.339 Minimum discharge, 33 cu ft/s (0.935 cu m/s) May 12. DISCHARGE. IN CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 117 142 121 119 32 70 49 56 111 73 55 60 2 123 122 127 103 82 138 53 59 85 70 57 155 3 113 118 149 99 82 73 51 52 92 68 60 293 4 114 1300 123 96 31 67 52 46 188 69 58 633 5 132 2290 115 136 81 64 69 43 616 97 58 469 6 149 605 123 140 34 63 50 47 652 282 62 600 7 141 389 122 115 81 62 45 41 463 125 57 242 8 178 315 111 107 81 61 46 40 397 87 53 128 9 148 242 108 153 91 61 46 39 245 74 51 91 10 139 324 106 146 119 61 46 39 196 68 51 141 11 164 799 111 124 158 61 45 37 154 66 50 1960 12 200 629 110 112 178 62 46 34 140 71 47 2130 13 161 369 103 108 115 61 50 37 120 65 48 494 14 141 260 100 150 105 60 51 98 128 62 66 601 15 230 225 97 125 95 61 107 95 108 75 72 344 16 458 198 96 108 89 60 70 60 93 66 142 407 17 329 177 99 104 96 64 54 325 93 61 112 1390 18 805 210 101 94 87 65 48 201 92 53 68 2970 19 824 185 100 92 79 63 45 562 218 63 59 2300 20 613 161 96 90 77 59 45 427 339 69 55 1100 21 666 153 319 90 74 123 42 180 213 63 54 1220 22 944 156 153 88 70 86 43 192 632 62 61 614 23 1090 142 126 85 66 66 43 166 239 60 100 424 24 424 140 117 85 66 62 44 193 152 59 59 344 25 261 139 110 92 65 60 45 245 117 53 54 274 26 203 134 104 88 64 53 46 254 100 55 78 257 27 162 127 106 84 64 82 74 141 94 59 141 291 28 137 124 103 82 64 87 128 211 36 59 108 199 29 125 121 106 82 65 59 176 129 80 65 65 236 30 126 123 113 82 --- 51 94 106 77 65 55 216 31 185 --- 120 82 49 --- 135 --- 58 50 --- TOTAL 9702 10419 3695 3266 2541 2119 1803 4295 6320 2332 2106 21083 MEAN 313 347 119 105 87.6 68.4 60.1 139 211 75.2 67.9 703 MAX 1090 2290 319 158 178 138 176 562 652 282 142 2970 MIN 113 118 96 82 64 49 42 34 77 55 47 60 CFSM 1.59 1.76 .60 .53 .45 .35 .31 .71 1.07 .38 .35 3.57 IN. 1.83 1.97 .70 .62 .48 .40 .34 .81 1.19 .44 .40 3.98 AC-FT 19240 20670 7330 6480 5040 4200 3580 8520 12540 4630 4180 41820 CAL YR 1983 TOTAL 114561 MEAN 314 MAX 12200 MIN 90 CFSM 1.59 IN 21.63 AC-FT 227200 MTR YR 1984 TOTAL 69681 MEAN 190 MAX 2970 MIN 34 CFSM .96 IN 13.16 AC-FT 138200 82 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 1983 TO SEPTEMBER 1984 OXYGEN• OXYGEN COLI- STREP- SPE­ DIS- DEMAND, FORM, TOCOCCI STREAM­ CIFIC SOLVED CHEM- FECAL, FECAL, HARD- FLOW, CON­ PH TUR- OXYGEN, (PEi..- ICAL 0.7 KF AGAR NESS INSTAN- DUCT­ (STAND- TEM'ER- BID- TIS- CENT (HIGH UM-MF (COLS. (MG/L TIME TANEOUS ANCE ARD ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER AS DAT (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) CAC03) OCT . 1983 04... DEC 1130 108 286 8.0 2g.3 6.0 7.3 101 24 K1300 550 130 03... 1405 112 312 7.9 26.5 6.1 3.3 103 <10 2200 3200 130 FEB . 1984 10... 1230 119 304 7.8 24.0 2.3 7.6 90 18 K15000 K230000 130 APR 13... 1120 48 319 7.3 27.0 2.5 8.6 108 <10 2400 2200 150 JUN 3... 1340 394 220 7.5 27.0 110 6.4 80 13 K11000 5200 110 AUG 02... 1120 57 300 7.8 23.0 5.5 3.1 103 2400 4900 140 SOLIDS. HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- SILICA, RESIDUE NESS, CALCIUM SIUM, SODIUM, AD- SLUM, LINITY SULFATE RIDE, RIDE, DIS- AT 18D NONCAR- DIS- DIS- DIS- SORP- DIS- FIELD DIS- DIS- DIS- SOLVED DEG. C BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED (MG/L DIS- (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L AS SOLVED DATE CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) AS CL) AS F) SI02) (MG/L) OCT P 1983 4... 0 41 7.8 11 .4 1.3 134 8.5 13 .10 22 186 DEC 08... 0 40 7.4 11 .4 1.6 130 9.0 13 <.10 20 190 FE8 . 1984 10... 1 40 7.5 11 .4 2.1 130 7.8 13 .10 17 187 APR 18... 1 46 7.8 11 .4 2.3 146 8.1 13 .10 15 208 JUN 08... 12 33 5.8 9.1 .4 2.6 95 14 12 .10 16 191 AUG 02... 0 43 7.3 10 .4 1.5 138 9.4 13 .20 16 200 SOLIDS. SOLIDS, NITRO- NITRO- NITRO- NITRO- PHOS- SUM OF SOLIDS. RESIDUE GEN, GENT GEN, GENTIAN- PHOS- PHORUS, CONSTI- DIS- AT 105 NO2+NO3 AMMONIA AMMONIA MONIA + PHOS- PHOS- PHORUS. ORTHOr TUENTS, SOLVED DEG. Co DM" DIS- DIS- ORGANIC PHORUS, PHORUS DIS- DIS- DIS- (TONS SUS- SOLVED SOLVED SOLVED TOTAL TOTAL TOTAL SOLVED SOLVED SOLVED PER PENDED (MG/L (MG/L (OWL (MG/L (MG/L (MG/L (MG/L (MG/L DATE (MG/L) DAY) (MG/L) AS N) AS N) AS NH4) AS N) AS P) AS PO4) AS P) AS P) OCT r 1983 04... 190 54 8 2.1 1.2 1.5 1.8 .12 .37 .08 1.4 DEC 08... 180 57 34 .71 .10 .13 <.10 .11 .34 .07 .09 FEB . 1984 10... 180 60 14 .52 .33 .43 .90 .39 1.2 .22 .19 APR 18... 190 27 10 .31 .53 .68 2.1 .32 .98 .29 .26 JUN 08... 150 203 148 1.4 .16 .21 1.1 .23 .15 .13 AUG 02... 180 31 184 .42 .04 .05 .40 .08 .05 .06 K = non-idoal count -- 83 RIO GRANDE DE MANATI BASIN 50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 PHOS- PHATE, ALUM- BERYL- CHRO- ORTHOr 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 (MG/L (UG/L (UG/L (UG/L (UG/L (UJ/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS PO4) AS AL) AS AS) AS BA) AS SE) AS CD) AS CR) AS CO) AS CU) AS FE) AS PB) OCT r 1933 4... 4.3 <10 2 55 1 <1 <1 <3 1 13 1 DEC 08... .23 FEB 41, 1934 10... .53 10 1 50 <.5 <1 <1 <3 2 11 3 APR 18... .80 JUN 08... .40 70 1 65 <.0 <1 <1 <3 9 32 4 AUG 2... .18 <10 1 52 <.0 <1 <1 <3 1 9 <1 SEDI- MANGA- MOLTS.* SELE - STROM"' VANA- SENT, LITHIUM NESE. MERCURY DENUM, NICKEL. NIUM, SILVER. TIUM, DIUM, SEDI- DIS- OIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- MENT• CHARGE, SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SUS- SUS­ (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L PENDED PENDED DATE AS LI) AS MN) AS HG) AS MO) AS NI) AS SE) AS AG) AS SR) AS V) (MG/L) (T/DAY) OCT , 1983 04... <4 32 <.1 <10 1 <1 <1 210 <6 23 6.7 DEC 08... FEB r 1984 10... <4 30 <.1 <10 2 <1 <1 190 8 72 23 APR 18... 35 4.5 JUN 3... <4 15 <.1 <10 1 <1 2 150 <6 175 186 AUG 02... <4 23 .3 <10 2 <1 <1 220 10 214 33 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOWr SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) COSMOS) (DEG C) OCT, 26 1130 196 228 28.0 MAR, 16 1028 61 308 26.0 NOV, 28 1530 121 238 27.5 MAR, 28 1108 87 322 27.0 DEC. 27 1250 104 299 27.0 APR, 26 1039 46 313 27.5 JAN, 25 1314 90 293 27.0 MAY. 30 1027 104 282 27.0 FEB, 23 1504 66 328 27.0 JUN. 25 1500 110 278 31.0 CHLOR... DI- PCB. ALORIN, DANE. DOD, ODE, DDT, AZINON, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN • 1984 08... 1340 <.1 <.01 <.1 <.01 <.01 <.01 .06 HEPTA- METH- DI- ENDO- HEPTA- CHLOR MALA- OXY- ELDRIN SULFAN, ENDRIN, ETHION, CHLOR. EPDXIDE LINDANE THION, CHLOR, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (US/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN • 1984 08... <.01 (.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 NAPH- THA- METHYL METHYL LINES. PARA- TRI- PARA- POLY* PER- TOX- TOTAL THION, THIONr MIREX, THION. CHLOR. THANE APHENE. TRI­ TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN , 1984 08... <.01 (.01 <.01 <.01 <.10 <.1 <1 <.01 84 RIO GRANDE DE MANATI BASIN 50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR - -Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 SED. SUSP. STREAM- SEDI- SIEVE FLOW, MENTP DIAM. INSTA4- SUS- X FINER TIME TANEOUS PENDED THAN DATE (CFS) (MGIL) .062 MM OCT , 1933 04... 1130 138 23 33 DEC 03... 1405 112 FEB 1984 10... 1135 119 72 59 APR 18... 1120 49 35 94 JUN 08... 1340 395 175 95 AUG 02... 1120 57 214 99 85 LAGUNA TORTUGUERO BASIN 50038200 LAGUNA TORTUGUERO OUTLET NEAR VEGA BAJA, PR WATER-QULLITY RECORDS LOCATION.--Lat 18°28'29", long 66°26'50", at bridge on Highway 686, 4.2 mi (6.8 km) northeast of Manati, and 4.4 mi (7.1 km) northwest of Vega Baja plaza. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1964-66, 1969-71, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CATE SJF- STREAM- CI:c ;LOW, CON- INSTAN- DUCT - TIME TANEDJS ANC= (C'S) CUMHOS) 04 (STAND- ARO UNITS) TFMRER- ATURE (DES C) CO' CIS - SOLI/ EC Cm:;/ L) OXYGEN, OXYSEN COLI- STRE7- DIS- CIMIND, c•3 M, T000CCI ALKA- SOLVED CHEM- -:CAL, FECAL, i_INITY (PER- ICAL 0.7 K; AGAR FIELD CENT :HIGH Um-m. (COLS. (mG/L SATJR- LEV7L) :COLS./ PER AS ATION) (MG/L) 100 ML) 100 ML) CAC03) OCT , 1983 06... 14)0 16 1303 o.c.: 31.5 1.2 112 71 K3 133 120 DEC 14... 1315 16 113) 4.0 21.3 9.0 115 21 K2 K3 138 MAR , 1934 09... 1320 11 1 760 3.3 27.3 13.1 1 73 29 293 K19 130 uAY 03... 1050 6.6 2150 1.3 21.3 9.2 119 32 74 48 124 JUN 13... 1645 17 1870 3.3 31.: 10.3 139 33 K9 32 93 AU; 01... 1620 13 1453 3.4 29.) 9.4 123 25 32 56 97 SOLIDS, NITRO- RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,Am- AT 105 GEN, GIN, 7)ENir GEN, 1EN, ")NIA 4 NITRO- NITRO- PHOS- OEG. C, NITRATE N:TPITE NO2+NO3 AMMONIA OR;AII: ORGANIC SENA, GEN, PHORUS, SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PEN:3ED (MG/L (MG/L (MG/L (m3/L (MS/L (MS/L (MG/L (M3/L (MG/L DATE (mS/L) AS N) AS N) AS \J) AS N) AS N) AS N) AS N) AS NO3) AS P) OCT , 1983 )6... 10 .43 .02 .7) .4? .31 1.3 2.0 3.9 .01 DEC 14... 6 .54 .02 .5J .34 1.2 1.5 2.1 9.3 .03 MAR , 1914 09... 10 <.01 .73 .31 1.5 1.3 2.5 11 C.01 MAY 13... 5 .53 .02 .60 .35 1.1 1.4 2.0 3.9 <.01 JUN 13... 8 .43 .02 .53 .17 1.5 1.7 2.2 9.7 .01 AUG 121... 6 .39 .010 .40 .110 1.0 1.1 1.5 6.6 <.01 K = non-ideal count 87 OCEAN° ATLANriC0 039750 0382 16 V v w v039650 169 0397 Loyola,' Tarlug o 0395 • 151 VEGA BAJ.A OA BAJA eT • 156 167 070 atiAANAT€ 155. VEGA ALTA glAlk 1.62 Drainage boundaries indeterminate OA ALTA in limestone terrane a Limestone Igneous and sedimentary racks CiAL. ES to MOROVIS NttRANJI TO a R§a. r.,gied4 kteneti'besir\„ NO de le Plata Drainage boundary 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 • c. Map arta Figure 14.--Rio Cibuco basin. ?N3.3%Ifl 1313 4 88 RIO CIBUCO BASIN 50038320 RIO CIBUCO BELOW COROZAL, PR LOCATION.--Lat 18°21'13", long 66°20'07", Hydrologic Unit 21010001, on right bank, 150 ft (46 m) downstream from Rio Corozal, and 1.4 mi (2.3 km) northwest of Corozal. DRAINAGE AREA.--15.1 sq mi (39.1 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--May 1969 to current year. GAGE.--Water-stage recorder. Altitude of gage is 195 ft (59.4 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--15 years (1970-84), 28.3 cu ft/s (0.801 cu m/s), 25.45 in/yr (646 mm/yr), 20,500 acre-ft/yr (25.3 cu hm/yr); median of yearly mean discharges, 30 cu ft/s (0.85 cu m/s), 21,700 acre-ft/yr (27 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,600 cu ft/s (385 cu m/s) Nov. 7, 1979, gage height, 19.80 ft (6.025 m), from rating curve extended above 100 cu ft/s (2.83 cu m/s) on basis of float and slope-area measurements of peak flow; minimum daily discharge, 1.3 cu ft/s (0.037 cu m/s) July 24-26, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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 m/s) (ft) (m) Oct. 22 1500 2,820 79.9 11.23 3.423 Sept. 11 1545 *9,790 277 17.86 5.444 Minimum discharge, 2.3 cu ft/s (0.065 cu m/s) May 11-13, 16. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 12 11 11 13 11 23 20 22 244 70 14 25 16 15 17 12 7.0 12 6.8 11 6.6 11 7.0 11 6.0 5.3 5.1 4.3 4.6 4.7 3.4 3.2 3.3 3.4 3.2 3.6 3.7 3.8 3.5 3.5 4.5 3.8 5.4 7.8 13 3.2 3.1 3.4 3.2 55 4.5 12 5.7 7.3 6.9 5.0 3.7 3.6 4.6 86 6 7 8 9 10 10 10 10 10 9.9 33 26 22 20 20 23 16 16 15 15 11 6.2 11 5.8 11 5.8 12 3.4 12 13 4.8 4.4 4.4 4.4 4.4 3.1 3.1 3.0 3.1 3.1 3.5 3.7 3.6 3.5 3.5 18 12 9.8 6.1 5.0 8.0 4.6 3.6 3.5 3.6 4.9 4.2 3.8 3.9 3.9 25 8.7 6.1 5.4 13 11 12 13 14 15 10 12 16 12 11 90 35 22 19 19 15 14 14 14 14 11 29 12 11 11 11 11 8.5 9.8 9.8 4.4 4.8 5.3 4.9 4.4 3.0 3.1 3.1 3.4 3.1 3.0 2.3 2.4 6.0 2.9 6.0 5.7 5.4 6.3 4.1 4.3 4.6 3.4 9.1 6.5 3.5 3.4 3.6 3.5 3.4 641 22 22 33 20 16 17 13 19 20 11 116 32 24 18 18 17 17 16 16 13 14 14 13 13 9.1 17 9.1 8.2 9.8 6.9 9.4 6.0 9.2 6.3 4.3 5.1 5.2 4.5 4.7 3.0 3.0 3.0 3.0 3.0 2.5 6.6 5.0 8.1 7.1 11 7.9 5.1 4.9 4.7 3.8 3.0 2.8 8.3 4.5 3.3 4.0 3.2 3.5 3.3 18 69 84 59 30 21 22 23 24 25 25 189 45 25 22 16 16 16 15 16 13 13 13 12 11 8.8 6.1 8.3 5.7 8.3 5.5 8.7 5.7 10 5.4 4.3 3.9 3.3 3.5 3.6 3.1 3.3 3.3 3.4 3.3 9.2 6.2 4.4 6.9 5.8 4.1 4.4 4.0 3.5 3.4 4.2 5.6 4.2 4.3 3.5 3.5 4.2 3.5 3.5 8.0 19 15 29 31 15 26 27 28 29 30 31 18 17 16 29 41 39 15 15 14 15 16 --- 12 12 12 12 15 21 8.6 5.6 7.9 4.8 7.6 4.9 7.2 5.1 6.8 --- 7.2 3.7 4.3 4.0 3.5 3.1 3.1 3.3 3.6 6.8 3.5 3.3 --- 6.8 4.5 3.6 3.7 12 6.2 3.1 3.0 3.1 3.4 3.5 --- 5.1 3.6 16 9.1 4.8 3.7 12 5.8 4.1 3.5 3.5 3.7 12 12 12 9.3 9.1 ..-- TOTAL MEAN MAX MIN CFSM IN. AC-FT 833.9 26.9 189 9.9 1.78 2.05 1650 923 30.8 244 14 2.04 2.27 1830 456 14.7 25 11 .97 1.12 904 304.8 235.1 9.83 8.11 12 29 6.3 4.8 .65 .54 .75 .58 605 466 135.3 4.36 5.3 3.1 .29 .33 268 99.5 3.32 6.8 3.0 .22 .25 197 151.1 4.87 12 2.3 .32 .37 300 182.0 6.07 18 3.0 .40 .45 361 205.6 6.63 55 2.8 .44 .51 408 147.1 4.75 12 3.2 .32 .36 292 1322.5 44.1 641 3.6 2.92 3.26 2620 CAL YR 1983 WTR YR 1984 TOTAL TOTAL 8880.8 4995.9 MEAN MEAN 24.3 13.7 MAX 492 MAX 641 MIN 6.0 MIN 2.3 CFSM 1.61 CFSM .91 IN 21.88 IN 12.31 AC-FT AC-FT 17620 9910 89 RIO CIBUCO BASIN 50038320 RIO CIBUCO BELOW COROZAL, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1969-76, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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- 8ID- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARO ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1983 11... 1100 10 370 8.0 25.5 4.5 7.7 95 23 370 440 DEC 07... 1015 16 352 8.0 22.0 4.1 7.2 83 10 33000 20000 MAR 1984 09... 1555 4.8 414 8.0 26.0 4.5 8.4 105 25 340 700 APR 19... 1550 2.9 506 7.7 29.5 2.1 5.2 69 23 K860 970 JUN 21... 1025 4.1 423 7.4 26.5 1.4 4.3 54 23 K800 300 AUG 08... 1120 3.7 539 7.6 28.0 1.8 5.6 71 13 K1200 910 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS, CALCIUM SUM, SODIUM, AD- SLUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- DIS- DIS-.. SORP- DIS- FIELD DIS- DIS- DIS-. (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED DATE AS CAC03) (MG/L CAC03) (MG/L AS CA) (MG/L AS MG) (MG/L AS NA) RATIO (MG/L AS K) AS CAC03) (MG/L AS SO4) (MG/L AS CL) (MG/L AS F) OCT , 1983 11... 130 7 33 12 19 .7 2.9 125 17 25 .20 DEC 07... -- -- 125 -- - - MAR , 1984 09... -.. 151 APR 19... 160 0 44 12 33 1 4.8 173 23 41 .30 JUN 21... -- ... -.. .... 166 AUG 08... 170 0 46 13 28 1 4.3 183 21 35 .30 SOLIDS, SILICA, SUM OF SOLIDS, SOLIDS, RESIDUE NITRO- NITRO- NITRO'''. NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- SOLVED TUENTS, DIS- AT 105 GEN, GEN, SOLVED DEG. C, NITRATE NITRITE GEN, NO2+NO3 GEN, GEN, MONIA + AMMONIA ORGANIC ORGANIC NITRO- GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE AS SI02) SOLVED (MG/L) PER DAY) PENDED (MG/L) (MG/L AS N) (MG/L AS N) (MG/L AS N) (MG/L AS N) (MG/L AS N) (MG/L AS N) (MG/L AS N) OCT , 1983 11... 34 218 5.9 4 1.2 .36 1.6 .63 .27 .9 2.5 DEC 7... -... -.. .... 8 .99 .11 1.1 1.1 1.3 2.4 3.5 MAR r 1984 9... -- .... -... 7 .56 .14 .70 3.9 2.0 5.9 6.6 APR 19... 33 290 2.3 8 .74 .36 1.1 4.5 1.5 6.0 7.1 JUN 21 ... .1WM .W.M -- 4 .22 .08 .30 3.6 .30 3.9 4.2 AUG 8... 30 265 2.9 6 .81 .59 1.4 5.2 1.8 7.0 8.4 K = non-ideal count 90 RIO CIBUCO BASIN 50038320 RIO CIBUCO BELOW COROZAL, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 C4R0- BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV­ TOTAL TOTAL TOTAL ERA3LE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS BA) AS CD) AS CR) AS P8) AS MG) AS SE) AS AG) OCT , 1983 11... 11 .65 3 <100 1 6 1 <.1 <1 <1 DEC 7... 15 .47 MAR , 1984 9... 29 .51 APR 19... 31 1.0 2 <100 1 5 1 2.8 <1 <1 JUN 21... 19 1.2 AUG 8... 37 1.5 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURF DATE TIME INSTANTANEOUS DUCTANCE TURF (CFS) (UMHOS) (DEG C) (CFS) (UMMOS) (DEG C) NOV, 15 1115 20 388 25.0 MAY, 24 1046 7.4 375 26.5 JAN, 12 1320 12 405 26.5 SEP, 11 1032 14 320 25.0 FEB, 28 1230 5.9 382 26.0 91 RIO CIBUCO BASIN 50039500 RIO CIBUCO AT VEGA BAJA, PR LOCATION.--Lat 18°26'53", long 66°22'29", Hydrologic Unit 21010002, 0.6 mi (1.0 km) downstream from Rio Indio, and 0.8 mi (1.3 km) east of Vega Baja. DRAINAGE AREA.--99.1 sq mi (256.7 sq km), of which 25.4 sq mi (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. Datum of gage is 7.79 ft (2.374 m) above mean sea level. REMARKS.--Records fair. AVERAGE DISCHARGE.--11 years (1974-84), 119 cu ft/s (3.370 cu m/s), 16.31 in/yr (414 mm/yr), 86,220 acre-ft/yr (106 cu hm/yr); median of yearly mean discharges, 114 cu ft/s (3.228 cu m/s), 82,600 acre-ft/yr (102 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 m), from rating curve extended above 3,000 cu ft/s) (85 cu m/s) on the basis of indirect measurements; minimum, 6.1 cu ft/s (0.173 cu m/s) July 24,25, 1977, gage height, 5.04 ft (1.536 m). EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Dec. 11, 1965 reached a stage of 26.2 ft (7.99 m), datum unknown, discharge about 28,000 cu ft/s (793 cu m/s). EXTREMES FOR CURRENT YEAR.--Peak discharges above base of 3,200 cu ft/s (90.6 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Sept. 11 2230 *2,210 62.6 13.30 4.054 Minimum discharge, 8.8 cu ft/s (0.249 cu m/s) May 5. DISCHARGE, IN CUBIC FEET PER SECOND, MATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 51 52 46 61 31 27 17 14 24 27 21 18 2 50 43 60 42 31 28 17 15 19 27 51 20 3 46 39 65 38 30 28 16 14 17 25 43 18 4 48 551 47 37 29 27 16 12 29 27 34 20 5 43 600 46 38 31 27 17 11 214 224 51 52 6 40 190 62 38 30 27 17 11 703 107 33 297 7 38 125 54 35 29 25 15 12 290 48 27 54 a 38 98 46 34 29 24 14 13 216 35 25 29 9 38 86 49 32 32 24 14 14 94 30 23 22 10 39 77 44 37 55 24 14 13 59 30 21 19 11 41 123 47 37 132 25 15 13 48 30 20 461 12 44 201 45 36 87 25 15 14 52 34 19 858 13 75 86 42 40 79 26 15 16 56 29 19 177 14 76 71 40 39 79 29 15 18 180 30 19 174 15 52 65 40 38 47 27 15 36 56 63 19 100 16 53 61 40 36 80 26 15 24 115 33 19 78 17 107 57 42 35 53 27 15 103 191 25 46 652 18 319 57 46 36 38 27 15 76 67 24 23 598 19 63 54 42 36 33 25 14 135 56 64 24 382 20 59 52 40 35 31 24 17 58 77 113 18 207 21 49 49 44 33 30 24 19 34 71 34 19 134 22 255 51 41 32 29 23 19 40 117 30 25 94 23 220 49 41 33 28 22 18 30 59 39 26 70 24 65 49 39 34 28 22 17 25 45 27 23 104 25 61 50 37 39 28 20 17 63 38 23 20 63 26 45 46 40 37 28 19 16 169 35 20 54 52 27 37 46 46 34 27 21 17 75 32 22 42 49 28 33 45 38 32 26 22 21 28 30 19 29 54 29 37 44 41 31 26 20 21 36 28 56 22 59 30 58 48 43 30 --- 20 14 52 28 29 20 95 31 113 --- 84 30 18 --- 45 --- 22 18 ..-- TOTAL 2293 3165 1437 1125 1236 753 487 1219 3046 1346 853 5010 MEAN 74.0 106 46.4 36.3 42.6 24.3 16.2 39.3 102 43.4 27.5 167 MAX 319 600 84 61 132 29 21 169 703 224 54 858 MIN 33 39 37 30 26 18 14 11 17 19 18 18 CFSM .75 1.07 .47 .37 .43 .25 .16 .40 1.03 .44 .28 1.69 IN. .86 1.19 .54 .42 .46 .28 .18 .46 1.14 .51 .32 1.88 AC-FT 4550 6280 2850 2230 2450 1490 966 2420 6040 2670 1690 9940 CAL YR 1983 TOTAL 33638 MEAN 92.2 MAX 1780 MIN 21 CFSM .93 IN 12.63 AC-FT 66720 MTR YR 1984 TOTAL 21970 MEAN 60.0 MAX 858 MIN 11 CFSM .61 IN 8.25 AC-FT 43580 -- 92 RIO CIBUCO BASIN 50039500 RIO CIBUCO AT VEGA BAJA, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1972 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLT- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TJR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARO ATURE /TY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MGM ATION) (MG/t) 100 ML) 100 ML) OCT , 1983 5... 1045 40 428 7.6 27.5 26 3.8 48 3000 2000 DEC 14... 0945 40 408 7.6 23.5 3.7 4.4 52 <10 2300 300 MAR , 1984 6... 1740 27 441 8.1 26.0 3.5 7.4 91 20 550 440 APR 19... 1035 13 465 7.6 26.5 <1.0 3.2 40 <10 250 430 JUN 21... 1430 44 532 7.6 27.0 6.5 4.8 60 10 2000 270 AUG 09... 1100 23 443 7.6 23.0 3.5 3.4 43 <10 570 240 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- HARO- NESS, CALCIUM SIUM. SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- 0/S- DIS- SORP- DIS- FIELD DIS- DIS- On- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) AS CL) AS F) OCT 1933 06... 180 13 58 9.6 17 .6 2.5 172 14 23 .10 DEC 14... 164 MAR , 1984 06... 193 APR 19... 210 7 67 10 20 .6 2.7 202 8.5 13 .10 JUN 21... 212 AUG 09... 210 16 68 9.6 16 .5 2.6 194 18 25 .20 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- On- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE S/02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 06... 22 250 27 6 1.6 .03 1.7 .08 .42 .50 2.2 DEC 14... 8 1.7 .07 1.8 .12 .28 .40 2.2 MAR , 1934 06... 6 .87 .03 .90 .39 1.4 1.8 2.7 APR 19... 15 260 9.3 5 .75 .05 .80 .26 .84 1.1 1.9 JUN .• 21... -- 11 1.1 .07 1.2 .23 .07 .30 1.5 AUG 09... 17 270 17 5 1.3 .02 1.3 <.01 <.10 K = non-ideal count 93 RIO CIBUCO BASIN 50039500 RIO CIBUCO AT VEGA BAJA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CMR0- BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV... RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS BA) AS CD) AS CR) AS PS) AS MG) AS SE) AS AG) OCT r 1983 06... 9.7 .27 4 200 <1 10 5 <.1 <1 <1 DEC 14... 9.7 .26 MAR , 1984 06... 12 .40 APR 19... 3.4 .53 2 <100 1 <1 <1 .2 <1 <1 JUN 21... 6.6 .32 AUG 09... .34 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA... DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURF (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) NOV, 14 1035 72 400 24.5 MAY, 21 1213 33 436 27.0 JAN, 12 1015 35 416 25.0 JUL, 09 1416 30 450 29.0 FEB. 23 1105 23 449 24.5 SEP. 05 1048 24 460 28.0 RIO CIBUCO BASIN 50039650 DRAINAGE DITCH BELOW WARNER LAMBERT LABORATORY NR SABANA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°27'17", long 66°21'09", 0.3 mile (0.5 km) northwest of Warner Lambert Laboratory, 0.6 mile (1.0 km) south of Sabana, and 1.1 miles (1.8 km) above confluence with Rio Cibuco. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1982 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLE- SPE- DIS- DEMAND, FORM, STREAM- CIFIC SOLVED CHEM- FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 INSTAN- DUCT- (STAND- TEMPER- SID- DIS- CENT (HIGH UM-MF TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) OCT • 1983 26... 1420 1 .10 333 6.6 28.5 11 .0 0 75 300 DEC 22... 1015 E .00 549 7.2 25.0 2.5 .0 0 29 58000 MAR • 1984 05... 1100 E .00 356 6.8 23.0 6.6 .0 0 74 K1500 APR 23... 1445 E .00 725 7.0 26.0 <1.0 .5 6 12 K140 JUN 22... 1315 E .00 644 7.0 28.5 1.8 .0 0 20 K1000 AUG 07... 1250 E .00 418 7.0 30.0 3.2 .0 0 23 380 STREP- TOCOCCI HARD- MAGNE- SODIUM POTAS- ALKA- FECAL, HARD- NESS, CALCIUM SIUM, SODIUM, AO- SION, LINITY SULFATE KF AGAR NESS NONCAR- DIS- DIS- DES- SORP- DIS- FIELD On- (COLS. (MG/L SONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED PER AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L DATE 100 ML) CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) OCT • 1983 26... K1300 100 15 31 6.3 29 1 2.8 39 14 DEC 22... K1100 190 MAR • 1984 05... K100 85 APR 23... 800 230 65 74 10 50 2 1.6 161 27 JUN 22... 110 192 AUG 07... 380 160 20 50 7.5 23 .8 1.8 136 24 SOLIDS, SOLIDS, CHLO- FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- RIDE, RIDE, DIS- CONSTI- DES- AT 105 GEN, GEN, GEN, GEN, DIS- DIS- SOLVED TUENTS, SOLVED DEG. Co NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL (MG/L (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L DATE AS CL) AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) OCT • 1983 26... 51 DEC 22... MAR 1984 05... APR 23... 120 JUN 22... AUG 07... 39 .20 10 200 5.3 8 .01 <AO .15 .85 <1 <.01 (.10 .07 .93 8 <.01 (.10 .15 1.3 .30 13 390 .00 2 <.01 (.10 .09 .51 12 (.01 <.10 .07 1.1 .20 15 240 .00 11 .01 <.10 .15 .45 E = estimate K = non-ideal count 94 RIO CIBUCO BASIN 50039650 DRAINAGE DITCH BELOW WARNER LAMBERT LABORATORY NR SABANA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 NITRO- CHRO- GEN,AM- BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, MONIA + PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELF- TOTAL ORGANIC PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERA3LE ERABLE ERABLE ERA3LE ERA3LE TOTAL ERA3LE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS N) AS P) AS AS) AS 3A) AS CO) AS CR) AS PB) AS HG) AS SE) AS AG) OCT r 1983 76... 1.0 .12 2 <100 1 3 3 <.1 <1 3 DEC 22... 1.0 .10 MAR , 1934 OS... 1.4 .39 - - APR 23... .60 .05 1 100 1 <1 <1 <.1 <1 <1 JUN 22... 1.2 .07 AUG 07... .60 .10 95 -- -- -- 96 RIO CIBUCO BASIN 50039700 DRAINAGE DITCH AT RIO CIBUCO BELOW CENTRAL SAN VICENTE, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°27'44", long 66°21'52", 60 ft (18 m), above confluence with Rio Cibuco, 984 ft (300 m) east of Central San Vicente, and 0.7 mi (1.2 km) west of Sabana. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1982 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OX , GEN coLI- STRE- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CTFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TJR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- On- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1933 26... 1010 10 421 7.0 26.0 12 .2 2 57 490 1403 DEC 22... 1250 E 8.0 614 7.4 27.0 19 .3 4 27 430 430 MAR ,1934 05... 1205 2.5 450 7.3 24.5 3.4 .5 6 42 230 370 APR 23... 1225 5.2 595 7.4 27.0 4.1 3.0 33 <10 K160 780 JUN 22... 1105 9.7 662 7.4 27.0 13 3.0 38 17 3600 2200 AUG 07... 1455 7.4 407 7.4 29.5 1.5 3.6 47 <10 K180 K170 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS. CALCIUM srum, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- DIS- OIS- SORP- DIS- FIELD DIS- 015- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (mS/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT , 1983 26... 150 12 47 5.2 26 1 2.4 139 9.7 48 .20 DEC 22... -- 226 -- MAR , 1984 05... 163 APR 23... 210 24 67 9.9 34 1 2.2 184 24 67 .20 JUN 22... -- 138 - - AUG 07... 190 46 63 8.7 17 .6 2.5 147 19 26 .20 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- OIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (NG/L DIS.". (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L OWL. (MGR. (MG/L (MG/L (MG/L (MG/L DATE SM2) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 26... 12 240 6.4 15 <.01 <.10 .07 .83 .90 DEC 22... 8 <.01 <.10 .05 .55 .60 MAR . 1984 05... 11 (.01 <.10 .13 1.1 1.2 APR 23... 14 330 4.4 10 .01 <.10 .08 .52 .60 JUN 22... -- 16 .09 .01 .10 <.01 <.10 AUG 07... 17 240 4.8 7 .69 .01 .70 .01 .69 .70 1.4 E = ostimato K = non-ideal count 97 RIO CIBUCO BASIN 50039700 DRAINAGE DITCH AT RIO CIBUCO BELOW CENTRAL SAN VICENTE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE NITRO- GEN, TOTAL (MG/L AS NO3) PHOS- PHORUS, TOTAL (MG/L AS P) ARSENIC TOTAL (UG/L AS AS) 3ARIUM, TOTAL RECOV- ERA3LE (UG/L AS SA) CADMIUM TOTAL RECOV- ERABLE (UG/L AS CO) CHRD- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) LEAD, TOTAL RECOV- ERABLE (UG/L AS P3) MERCURY TOTAL RECOV- ERA3LE (UG/L AS HG) SELE- NIUM, TOTAL (UG/L AS SE) SILVER. TOTAL RECOV­- ERABLE (UG/L AS AG) OCT , 1983 26... DEC 22... MAR , 1984 05... APR 23... JUN 22... AUG 07... 6.2 .12 .09 .07 .17 .06 .30 2 2 <100 103 2 1 1 <1 3 <1 <.1 .1 <1 <1 <1 <1 98 RIO CIBUCO BASIN 50039750 RIO CIBUCO BELOW CENTRAL SAN VICENTE, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°27'47", long 66°21'53", at bridge on Highway 688, 1,000 ft (305 m) northeast of Central San Vicente, 0.8 mi (1.3 km) west of Sabana, and 1.3 mi (2.1 km) northwest of Warner Lambert Laboratory. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1982 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN CUP- 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- 8I0- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARD ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) CUMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) CMG/L) 100 ML) 100 ML) OCT , 1983 26... 1210 66 402 7.6 27.3 14 5.3 76 21 4300 K1400 DEC 22... 1215 39 455 7.6 25.0 2.3 5.4 65 30 K990 620 MAR , 1914 05... 1345 22 441 7.8 26.0 4.4 7.1 37 13 200 340 APR 23... 1115 10 557 7.6 27.0 9.9 4.2 53 <10 K630 730 JUN 22... 1040 94 383 7.6 25.0 55 7.7 93 17 43000 34000 AUG 03... 1455 38 478 7.8 29.0 4.0 7.4 96 10 550 560 HARD- MAGNE-- SODIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- DIS- DIS- SORP- DIS- FIELD DIS- DIS.- 01S- (MG/L SONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED DATE AS CAC03) (MG/L CAC03) (MG/L AS CA) (MG/L AS MG) (MG/L AS NA) RATIO (MG/L AS K) AS CAC03) (MG/L AS 504) (MG/L AS CL) (MG/L AS F) OCT , 1933 26... 180 17 55 9.2 17 .6 3.0 159 17 23 .20 DEC 22... 175 -- MAR • 1934 05... 137 APR 23... 210 16 66 10 28 .9 2.5 190 19 51 .20 JUN 22... 154 ..- AUG 08... 160 0 53 7.7 20 .7 2.2 180 23 33 .20 SOLIDS, SOLIDS, NITRO SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO-GEN,AM- DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C. NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L ors- (TONS SUS.'" TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE AS SI02) SOLVED (MG/L) PER DAY) PENDED (MG/L) (MG/L AS N) (MG/L AS N) (MG/L AS N) (MG/L AS N) (MG/L AS N) (MG/L AS N) (MG/L AS N) OCT , 1983 26... 19 240 43 20 1.4 .04 1.4 .09 .71 .80 2.2 DEC 22... <1 1.6 .05 1.6 .08 .62 .70 2.3 MAR , 1984 05... 4 <.01 .80 <.01 1.1 1.9 APR 23... 13 300 9.0 10 <.01 .10 .06 .54 .60 .70 JUN 22... -- 66 1.3 .08 1.4 .14 .36 .50 1.9 AUG 08... 16 260 27 10 <.01 .20 .02 .48 .50 .70 K = non-ideal count 99 RIO CIBUCO BASIN 50039750 RIO CIBUCO BELOW CENTRAL SAN VICENTE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO­ SARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV­ TOTAL TOTAL TOTAL ERASLE ERABLE ERABLE ERABLE ERASLE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L <UG/L (UG/L DATE AS NO3) AS P) AS AS) AS 8A) AS CD) AS CR) AS P3) AS HG) AS SE) AS AG) OCT , 1983 26... 9.7 .20 1 <100 1 3 2 <.1 <1 2 DEC 22... 13 .27 MAR , 1984 05... 3.4 .41 APR 23... 3.1 .32 2 100 1 <1 <1 (.1 <1 <1 JUN 22... 3.4 .27 AUG 08... 3.1 .21 CHLOR- DI- PCS, ALORIN, DANE, DOD, DOE, DDT, AZINON, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN , 1934 22... 1040 <.1 (.31 <.1 (.01 <.01 <.01 .02 HEPTA- METH- DI- ENDO- HE'TA- CHLOR MALA- OXY- ELORIN SULFAN, ENCRIN, ETHION, CHLOR, EPDXIDE LINOANE THION, CHLOR, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN , 1984 22... <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 NAPH- THA- METHYL METHYL LEWES, PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI­ TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN , 1954 22... .03 <.01 <.01 (.01 <.10 <.1 <1 <.01 I 101 OCEA A L A N T d C 0 A# JUAN DORADO 7-59 Tr A 0150 CATARO VEGA ALTA Li to 1/"-- Igneous and sedimentary rocks 0460 Drainage boundories indeterminate BAYAMON in limestone terrone TOA ALTA 4.1 (--.' 7- ) \ ) <, \ , Limestone // ) Igneous and \. edimeniary rocks \,..„ n —11/4- ,,...,,i, Oh ,J \ ..../ \,.. \-C \...71 C OR OZ R 950 \ r--Mop area 43A P, 04 4 ;(:::- s07:67LT:i NiAttoo°^ ;0 \otitimoutz 044 50 PO.CE ARANJI T • Rio Cithico oosin • C Represe e Corner,)' 0440 : Ri'e; de Boyorktirs basin Drainot e boundory COMERK) '3' £,, ontk; Mosor3 nos) qA Droinage boundary A RAN0U TAG Island divide ODRA <6,*, Pro Grande de Lata basin 0430 • Lo Plo 37 RA> Go2,t ,/ 33 EXPLANAtrtrig CAYEY pr A0460 SURFACE—WATER STATION AND NUMBER A0458 LOW—FLOW STATION AM) NUMBER 039 0430 QUALITY O —F—WATER STATION AND NUMBER to'. Set: (Nip.) basin f `03995 ego arite a tats • 38 WELL AND WELL NUMBER 'rKit_Ciasf..TERS do F.a basin 1 1 60.4ILES RraAs TrnlInaa ikosm Figure 15.--Rio de la Plata basin. 102 RIO DE LA PLATA BASIN 50043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR LOCATION.--Lat 18°09'37", long 66°13'44", Hydrologic Unit 21010005, at upstream side of bridge on Highway 173, 0.4 mi (0.6 km) northeast of Proyecto La Plata, and 2.5 mi (4.0 km) upstream from Rio Usab6n. DRAINAGE AREA.--54.8 sq mi (142 sq km), excludes 8.2 sq mi (21.1 sq km) upstream from Carite Reservoir, the flow of which is diverted to Rio Guamani. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1958 (occasional measurements only), February 1959 to March 1960 (monthly measurements only), April 1960 to current year. GAGE.--Water-stage recorder. Altitude of gage is 850 ft (259 m), from topographic map. Prior to Mar. 29, 1961, wire-weight gage read twice daily at same site and datum. REMARKS.--Records fair. The Puerto Rico Aqueduct and Sewer Authority operates a pumping plant about 5 mi (8 km) upstream which can divert as much as 23 cu ft/s (0.65 cu m/s) into Cidra Reservoir. AVERAGE DISCHARGE.--24 years (1961-84), 111 cu ft/s (3.144 cu m/s), 27.51 in/yr (699 mm/yr), 80,420 acre-ft/yr (99.2 cu hm/yr); median of yearly mean discharges, 84 cu ft/s (2.38 cu m/s), 60,900 acre-ft/yr (75 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 59,600 cu ft/s (1,688 cu m/s) Aug. 27, 1961, gage height, 32.21 ft (9.818 m), from rating curve extended above 7,000 cu ft/s (198 cu m/s) on basis of slope-area measurement; minimum daily, 2.6 cu ft/s (0.074 cu m/s) July 25, 1974. EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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) (m) Feb. 16 0100 4,220 120 10.47 3.191 July 5 0300 *5,370 152 10.92 3.328 Minimum discharge, 5.8 cu ft/s (0.164 cu m/s) July 26. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 48 38 26 58 28 19 17 20 886 502 26 91 58 28 26 23 18 13 13 15 12 12 11 12 15 15 14 13 13 13 16 15 12 12 12 12 11 10 8.2 7.4 20 12 11 9.1 8.4 10 30 20 15 400 10 15 20 12 27 7.3 7.4 26 20 46 6 7 8 9 10 23 21 21 22 25 310 189 101 76 60 27 31 24 21 17 19 16 13 13 13 15 12 11 11 59 14 13 13 15 16 13 16 16 14 13 7.5 8.2 7.8 8.0 7.7 76 115 49 25 324 100 50 30 25 20 14 12 9.8 7.1 7.1 160 20 12 9.6 10 11 12 13 14 15 22 24 29 24 20 50 100 50 30 27 20 19 20 18 18 14 13 15 183 42 33 21 499 241 90 13 12 12 13 13 16 16 14 14 16 7.2 7.5 8.9 18 20 128 37 37 44 29 18 17 16 100 50 11 11 11 9.9 9.4 56 31 25 31 20 16 17 18 19 20 31 28 25 21 22 25 24 23 24 24 21 19 15 17 17 24 19 21 26 34 1040 241 111 71 51 13 14 16 16 15 16 16 17 16 14 32 12 12 13 12 18 52 28 18 12 20 16 12 10 8.2 10 10 9.4 11 11 43 188 949 1010 956 21 22 23 24 25 27 36 51 38 24 23 21 19 18 16 17 16 18 17 14 44 24 21 17 17 39 33 30 27 25 9.9 9.9 10 11 13 14 13 13 12 12 11 11 12 15 15 10 10 9.0 9.0 9.0 6.8 10 14 11 7.6 9.3 9.4 8.4 7.4 7.5 661 178 68 39 28 26 27 28 29 30 31 22 20 22 20 23 22 17 19 19 23 25 --- 9.7 11 12 12 15 22 18 15 14 15 13 12 23 21 21 19 --- 14 15 14 13 15 16 11 11 20 15 13 --- 13 24 22 19 55 76 8.0 8.0 8.0 8.0 8.0 --- 6.2 7.8 8.0 7.0 15 17 11 74 16 8.0 7.6 6.8 21 27 15 13 13 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 861 27.8 58 20 .51 .58 1710 2757 91.9 886 16 1.68 1.87 5470 696.7 22.5 91 9.7 .41 .47 1380 757 24.4 183 12 .45 .51 1500 2806 96.8 1040 11 1.77 1.90 5570 416.8 13.4 16 9.9 .25 .28 827 428 14.3 20 11 .26 .29 849 503.4 16.2 76 7.2 .30 .34 998 1139.5 38.0 324 8.0 .69 .77 2260 1077.6 34.8 400 6.2 .64 .73 2140 403.1 13.0 74 6.8 .24 .27 800 4690.3 156 1010 7.3 2.85 3.18 9300 CAL YR 1983 WTR YR 1984 TOTAL TOTAL 28544.0 16536.4 MEAN 78.2 MEAN 45.2 MAX MAX 2920 1040 MIN 9.0 MIN 6.2 CFSM CFSM 1.43 .83 IN 19.38 IN 11.23 AC-FT AC-FT 56620 32800 103 RIO DE LA PLATA BASIN 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 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI- STREP­ SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TjR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- 3ID- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARO ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) AT ION) (MG/L) 100 ML) 100 ML) OCT • 1933 07... 1405 21 382 8.4 30.5 17 19.0 138 27 300 230 DEC 15... 1125 13 444 8.2 24.5 3.1 13.2 126 <10 38 K30 MAR , 1934 14... 1335 13 440 8.8 23.3 4.5 11.3 149 12 250 170 MAY 03... 1255 10 427 8.2 23.0 3.4 13.3 171 16 K160 350 JUN 20... 1330 10 353 8.2 23.0 4. 2 19.4 136 K250 230 AUG 15... 1425 8.4 475 8.4 31.0 .40 11.4 157 12 K160 50 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- HARO- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- CIS- DIS- ors- SORP- OIS- FIELD DIS- DIS- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) AS CO AS F) OCT , 1933 07... 130 0 32 12 29 1 2.3 131 17 30 .20 DEC 15... 166 -- MAR , 1934 14... 169 MAY 03... 160 0 39 16 34 1 2.7 166 24 32 .20 JUN 20... 136 AUG 15... 140 0 32 14 41 2 3.2 147 20 45 .30 SOLIDS, SOLIDS, NITRO... SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- OS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENOED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 07... 25 230 13 6 2.0 .02 2.0 .04 .66 .70 2.7 DEC 15... 8 2.3 .02 2.3 .03 .77 .80 3.1 MAR , 1984 14... 6 1.7 .02 1.7 .04 .56 .60 2.3 MAY 03... 24 270 7.3 8 .77 .03 .80 .07 .63 .70 1.5 JUN 20... 5 1.2 .02 1.2 .06 1.2 1.3 2.5 AUG 15... 25 270 6.1 2 <.01 <.10 .41 .29 .70 -- K = non-ideal count 104 RIO DE LA PLATA BASIN 50043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO­ BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NI TRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERA3LE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L (MGIL (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS 3A) AS CD) AS CR) AS P8) AS MG) AS SE) AS AG) OCT r 1933 07... 12 .52 200 1 12 4 (.1 <1 <1 DEC 15... 14 .66 MAR , 1934 14... 10 .35 MAY 03... 6.6 .57 2 <100 1 2 1 <.1 <1 <1 JUN 20... 11 .54 AUG 15... 1.1 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS OUCTANCE TURF DATE TIME INSTANTANEOUS DUCTANCE TURE (CPS) (UMHOS) (0EG C) (CFS) (UMHOS) (DEG C) NOV, 18 1223 24 413 27.5 MAR, 13 1300 13 440 26.0 JAN, 24 1343 13 317 25.5 105 RIO DE LA PLATA BASIN 50044000 RIO DE LA PLATA NEAR COMERIO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°14'33", long 66°12'28", at bridge on Highway 156, 0.56 mi (0.9 km) upstream from dam, about 2.0 mi (3.2 km) northeast of Comerio plaza. DRAINAGE AREA.--139 sq mi (360 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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. TIME TANEOUS ANCE ARO ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (UMHOS) UNITS) (DEG C) (NTU) CMG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1933 18... 0945 103 301 7.8 25.0 323 7.4 92 58 K90000 K140000 DEC 20... 1105 33 407 8.2 24.5 11 11.0 134 <10 400 250 MAR , 1984 14... 1050 28 433 8.5 25.0 1.5 9.1 112 12 K950 950 MAY 04... 1150 24 409 8.1 23.0 5.0 11.5 150 16 K960 550 JUN 29... 1015 21 393 8.0 27.0 9.9 9.2 117 22 340 400 AUG 23... 0915 63 443 8.0 27.5 6.0 8.4 108 13 K1400 600 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS, CALCIUM SIUM, SODIUM, AO* SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- DIS-. DIS- SORP- DIS- FIELD DIS- DIS- DIS- (MG/L 80NATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (Mr/IL (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC031 CAC03) AS CA) AS MG) AS NA) AS K) CACO3) AS 504) AS CL) AS F) OCT • 1983 13... 100 1 24 10 20 .9 3.6 100 16 22 .20 DEC 20... 156 MAR , 1984 14... 165 MAY 04... 160 5 36 16 28 1 3.1 151 26 30 .20 JUN 29... -- ... .w.l. -.. 151 -- AUG 23... 150 0 34 15 38 1 4.0 150 28 44 .20 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO.. NITRO- GEN,AM- D/S- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (4G/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 18... 20 180 49 15 ...... <.01 <.10 .04 2.7 2.7 -- DEC 20... -- -.. 6 1.2 .04 1.2 .04 .56 .60 1.8 MAR • 1984 14... 5 .94 .06 1.0 .29 .21 .50 1.5 MAY 04... 28 260 17 11 .78 .12 .90 .25 1.2 1.4 2.3 JUN 29... -- 16 .65 .05 .70 .11 .19 .30 1.0 AUG 28... 25 280 47 6 1.4 .06 1.5 .02 .58 .60 2.1 K a non-ideal count DATE 106 RIO DE LA PLATA BASIN 50044000 RIO DE LA PLATA NEAR COMERIO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE NITRO- GEN, TOTAL (MG/L AS NO3) PROS- PMORUS, TOTAL (MG/L AS P) ARSENIC TOTAL (UG/L AS AS) BARIUM, TOTAL RECOV- ERA3LE (UGIL AS 3A) CADMIUM TOTAL RECOV- ERABLE (UG/L AS CO) CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) LEAD, TOTAL RECOV- ERABLE (UG/L AS P3) MERCURY TOTAL RECOV- ERABLE (UG/L AS MG) SELE- NIUM, TOTAL (UG/L AS SE) SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) OCT r 1983 18... DEC 20... 3.0 MAR , 1984 14... 6.6 MAY 04... 10 JUN 29... 4.4 AUG 28... 9.3 .34 .48 .52 .55 .51 .90 1 2 100 100 1 1 37 3 16 3 <.1 <.1 1 <1 1 <1 107 RIO DE LA PLATA BASIN 50044850 RIO GUADIANA NEAR NARANJITO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°18'39", long 66°13'28", at steel-cross-bridge 0.8 mi (1.3 km) northwest of Highway 164, 1.2 mi (1.9 km) upstream from mouth and about 2.0 mi (3.2 km) northeast of Naranjito plaza. DRAINAGE AREA.--4.0 sq mi (10.3 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI- STREP­ SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, 7LOW. CON- PH TJR- OXYGEN, (PER- ICAL u.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- 015- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARC ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/0 100 ML) 100 ML) OCT , 1983 19... 1240 5.8 317 8.0 27.5 1.7 3.0 102 <10 <13000 K1100 DEC 20... 1315 4.6 342 8.0 25.0 2.1 8.3 107 13 K7000 K1100 MAR , 1924 20... 3855 2.8 307 7.8 21.0 23 9.2 104 10 <7000 K11000 MAY 09... 1255 1.4 353 8.2 29.0 1.0 13.0 170 <10 470 2800 JUN 29... 1225 2.5 363 8.0 27.5 3.0 3.6 109 17 <1000 K1400 AU5 28... 1230 3.3 351 8.0 30.0 1.5 3.2 108 13 K1100 520 HARD- ""ACNE- SOOIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- OIS- 01S- DIS- SORP- ()IS- FIELD OIS- DIS- OIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVE) (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MS/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS <) CAC03) AS 504) AS CL) AS F) OCT , 1983 18... 130 15 29 13 15 .6 2.2 111 15 21 .20 DEC 20... 121 -- MAR , 1984 20... 101 MAY 09... 140 19 32 14 21 .8 2.6 119 18 31 .20 JUN 29... 125 AUG 23... 130 15 32 13 19 .7 3.1 119 22 29 .20 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- OIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 18... 27 190 3.0 <1 <.01 <.10 .01 2.8 2.9 DEC 20... 8 1.7 .01 1.7 .07 .53 .60 2.3 MAR , 1984 20... 4 2.1 .02 2.1 .21 .19 .40 2.5 MAY 09... 26 220 .82 2 2.1 .02 2.1 .34 .26 .60 2.7 JUN 29... 16 2.4 .02 2.4 .12 .28 .40 2.8 AUG 28... 23 210 1.9 7 <.01 1.4 <.01 -- .40 1.8 K = non-ideal count 108 RIO DE LA PLATA BASIN 50044850 RIO GUADIANA NEAR NARANJITO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE NITRO- GEN, TOTAL (MG/L AS NO3) PHOS- PHORUS, TOTAL (MG/L AS P) ARSENIC TOTAL (UG/L AS AS) 3ARIjM, TOTAL RECOV- ERASLE (UG/L AS 3A) CADMIUM TOTAL RECOV - ERABLE (UG/L AS CO) CHRO- MIUM, TOTAL RECOV - ERA3LE (UG/L AS CR) LEAD. TOTAL RECOV- ERABLE (UG/L AS P8) MERCURY TOTAL RECOV- ERA3LE (UG/L AS HG) SELF - NIUM, TOTAL (UG/L AS SE) SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) OCT , 1983 18... DEC 20... 10 MAR , 1934 20... 11 MAY 09... 12 JUN 29... 12 AUG 28... 3.0 .28 .41 .52 .37 .78 .50 1 2 100 100 <1 2 32 <1 1 1 <.1 <.1 <1 1 <1 <1 109 RIO DE LA PLATA BASIN 50046000 RIO DE LA PLATA AT TOA ALTA, PR LOCATION.--Lat 18°23'50", long 66°15'17", Hydrologic Unit 21010005, on left bank, at upstream side of bridge on Highway 165, 800 ft (244 m) downstream from Rio Lajas, and 0.6 mi (1.0 km) northwest of Toa Alta, 10 mi (16 km) downstream from Puerto Rico Aqueduct and Sewer Authority reservoir. DRAINAGE AREA.--200 sq mi (518 sq km), excludes 8.2 sq km (21.2 sq km) upstream from Lago Carite, flow from which is diverted to Rio Guamani. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--November 1959 (measurement only), January 1960 to current year. GAGE.--Water-stage recorder. Datum of gage is 8.55 ft (2.606 m) above mean sea level (levels by Puerto Rico Department of Public Works). Prior to Feb. 25, 1960, wire-weight gage at same site and datum. REMARKS.--Records fair. Regulation at all stages by Puerto Rico Aqueduct and Sewer Authority reservoir upstream from gage. AVERAGE DISCHARGE.--24 years (1961-84), 267 cu ft/s (7.561 cu m/s), 18.13 in/yr (461 mm/yr), 193,400 acre-ft/yr (238 cu hm/yr); median of yearly mean discharges, 218 cu ft/s (6.17 cu m/s), 158,000 acre-ft/yr (195 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 95,500 cu ft/s (2,704 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, 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 resi­ dents are as follows: Sept. 13, 1928, 120,000 cu ft/s (3,400 cu m/s), gage height, 37.4 ft (11.4 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 above base of 6,000 cu ft/s (170 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Sept. 18 1430 *14,800 419 21.71 6.617 Minimum discharge, 2.2 cu ft/s (0.062 cu m/s) Apr. 25. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 65 100 33 23 14 25 11 5.2 12 12 30 20 2 59 90 48 19 11 19 11 5.6 13 13 54 17 3 53 80 37 19 11 16 9.9 5.2 12 15 37 17 4 52 300 31 19 11 15 9.9 4.2 11 17 101 17 5 51 500 27 18 10 14 8.8 4.0 14 249 89 39 6 48 200 31 18 9.9 15 7.5 4.2 39 48 43 63 7 39 100 24 26 11 15 6.7 4.7 23 26 35 27 8 36 80 24 26 11 14 6.3 5.0 16 20 31 21 9 47 70 25 25 9.4 14 5.7 4.3 12 17 28 19 10 39 100 22 20 15 14 5.1 3.9 11 28 27 19 11 36 200 24 17 51 13 4.7 4.0 12 29 26 88 12 52 100 23 13 16 13 4.1 3.3 14 22 26 125 13 101 80 22 16 48 13 3.6 3.6 288 18 31 99 14 63 65 22 15 32 17 3.3 3.6 148 37 25 93 15 51 64 22 15 15 14 3.1 3.8 31 42 24 55 16 51 60 23 15 107 13 3.1 4.1 64 20 70 57 17 320 58 26 14 138 12 2.7 4.3 53 18 50 706 18 192 56 27 16 78 12 2.7 4.6 27 18 30 2780 19 70 65 25 15 61 12 2.8 4.9 22 122 25 1420 20 59 65 23 15 56 11 2.9 5.4 19 106 23 2870 21 55 60 21 14 48 12 3.1 5.6 18 49 22 1810 22 67 46 24 13 42 12 3.4 6.7 17 68 25 649 23 83 41 25 13 38 13 3.7 8.3 15 88 50 305 24 206 39 21 16 60 13 3.1 11 15 51 22 184 25 160 39 20 17 238 12 2.7 15 14 37 20 107 26 130 37 20 15 77 12 3.1 15 13 32 30 101 27 110 37 20 14 73 12 4.1 20 13 28 80 93 28 100 35 20 14 79 11 4.7 11 11 38 40 90 29 95 33 20 13 38 11 4.7 15 13 44 20 81 30 90 35 20 14 --- 12 4.6 25 12 30 18 73 31 120 --- 42 14 11 --- 16 --- 28 17 --- TOTAL 2700 2835 792 525 1408.3 422 152.1 236.5 982 1370 1149 12045 MEAN 87.1 94.5 25.5 16.9 48.6 13.6 5.07 7.63 32.7 44.2 37.1 402 MAX 320 500 48 26 238 25 11 25 288 249 101 2870 MIN 36 33 20 13 9.4 11 2.7 3.3 11 12 17 17 CFSM .44 .47 .13 .09 .24 .07 .03 .04 .16 .22 .19 2.01 IN. .50 .53 .15 .10 .26 .08 .03 .04 .18 .25 .21 2.24 AC-FT 5360 5620 1570 1040 2790 837 302 469 1950 2720 2280 23890 CAL YR 1983 TOTAL 61338.0 MEAN 168 MAX 4720 MIN 6.9 CFSM .84 IN 11.41 AC-FT 121700 WTR YR 1984 TOTAL 24616.9 MEAN 67.3 MAX 2870 MIN 2.7 CFSM .34 IN 4.58 AC-FT 48830 . 110 RIO DE LA PLATA BASIN 50046000 RIO DE 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 1983 TO SEPTEMBER 1984 OXYGEN, COLT- STREP- SPE- DIS- FORM, TOCOCCI STREAM- CIFIC SOLVED FECAL, FECAL, HARD- FLOW, CON- PH TOR- OXYGEN, (PER- 0.7 KF AGAR NESS INSTAN.... DUCT- (STAND- TEMPER- 810- DIS- CENT UM-MF (COLS. (MG/L TIME TANEOUS ANCE ARD ATURE ITT SOLVED SATUR- (COLS./ PER AS DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) 100 ML) 100 ML) CAC03) OCT , 1983 03... 1305 53 419 7.7 29.0 3.0 5.3 75 2200 2100 170 DEC 07... 1410 23 542 7.8 26.5 1.8 7.4 92 3200 2800 210 FEB , 1984 03... 1520 11 560 7.5 23.0 1.2 2.4 28 K17 230 230 APR 17... 1350 2.7 632 7.4 23.5 1.0 9.6 124 56 700 240 JUN 11... 1235 12 472 7.1 26.0 1.3 1.4 17 2100 510 200 AUG 2... 1700 60 504 7.4 26.5 2.5 2.1 26 K9200 5000 210 HARD- MAGNE- SODIUM POTAS- ALKA- CHU?'" FLUO- SILICA, NESS. CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, DIS- NONCAR- DIS- DIS... DIS- SORP- DIS- FIELD OIS- DIS- DIS- SOLVED BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED (MG/L (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L AS DATE CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) AS CL) AS F) SI02) OCT , 1933 3... 6 51 11 21 .7 2.7 167 14 30 .20 22 DEC 07... 19 65 11 25 .8 2.9 189 20 41 .30 19 FEB , 1984 03... 18 70 13 29 .9 .90 211 18 49 <.10 17 APR 17... 14 73 14 32 .9 .50 226 15 60 .10 20 JUN 11... 30 62 11 23 .7 3.1 171 31 41 .20 16 AUG 02... 16 67 9.7 20 .6 3.1 192 23 34 .10 17 SOLIDS, SOLIDS, NITRO- NITRO- NITRO.... NITRO- PHOS- RESIDUE SUM OF SOLIDS, GEN, GEN, GEN, GEN,AM- PHOS- PHORUS, AT 180 CONSTI- DIS-. NO2+NO3 AMMONIA AMMONIA MONIA + PHOS- PHORUS, ORTHO, DEG. C TUENTS, SOLVED DIS- DIS... DIS- ORGANIC PHORUS, DIS- DIS- D/S-. DIS- (TONS SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED SOLVED DATE SOLVED (MG/L) SOLVED (MG/L) PER DAY) (MG/L AS N) (MG/L AS N) (MG/L AS NH4) (MG/L AS N) (MG/L AS P) (MG/L AS P) (MG/L AS P) OCT , 1983 03... 262 250 37 .56 .14 .18 .40 .14 .15 .15 DEC 07... 328 300 20 1.1 .11 .14 .40 .24 .22 .21 FEB , 1984 03... 344 320 10 .16 .02 .03 .70 .35 .33 .33 APR 17... 384 350 2.6 <.10 .10 .13 .60 .19 .18 .10 JUN 11... 334 290 11 <.10 .28 .36 .50 .52 .39 .37 AUG 02... 315 290 51 .10 .36 .46 1.1 .27 .20 .20 K = non-ideal count 111 RIO DE LA PLATA BASIN 50046000 RIO DE LA PLATA AT TOA ALTA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 PHOS- PHATE• ALUM- BERYL- CHRO- ORTHO• INUM• ARSENIC BARIUM, LIUM. CADMIUM MIUM, COBALT• COPPER• IRON• DIS- BIS'''. DIS- DIS- DIS- DIS- DIS- On- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS PO4) AS AL) AS AS) AS BA) AS BE) AS CD) AS CR) AS CO) AS CU) AS FE) OCT • 1983 03... .46 <10 2 61 <.5 <1 <1 <3 1 19 DEC 07... .64 -- FEB • 1984 03... 1.0 <10 2 64 <.5 <1 <1 <3 2 6 APR 117• • • .31 -- JUN 11... 1.1 20 2 81 <.0 <1 1 <3 1 13 AUG 2... .61 <10 2 65 <.0 <1 1 <3 1 18 MANGA- MOLY3- SELE- STRON- VANA- LEAD, LITHIUM NESE, MERCURY DENUM, NICKEL, NIUM, SILVER• TIUM, OIUM• DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS P8) AS LI) AS MN) AS MG) AS MO) AS NI) AS SE) AS AG) AS SR) AS V) OCT • 1983 3... 1 <4 160 <.1 <10 2 <1 <1 220 <6 DEC 07... FEB • 1984 03... 1 <4 53 <.1 <10 4 <1 <1 340 <6 APR 17... -- JUN 11... <1 <4 710 .6 <10 3 <1 <1 350 <6 AUG 02... <1 <4 140 .2 <10 1 <1 <1 310 <6 STREAMFLOM. SPECIFIC CON- TEMPERA- STREAMFLOW. SPECIFIC CON- TEMPERA'' DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) NOV, 14 1530 65 410 26.0 MAY, 23 1037 8.6 680 26.0 JAN. 13 0925 16 568 24.5 JUL, 17 1236 18 421 30.0 MAR, 16 1240 12 510 26.0 SEP. 11 1321 30 520 26.5 DI- PC8• ALDRIN, DANEr DOD• DOE, DDT, AZINON• TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN • 1984 11... 1235 <.1 <.01 <.1 <.01 <.01 <.01 .03 HEPTA- METH- DI- ENDO- HEPTA- CHLOR MALA- OXY- ELDRIN SULFAN• ENDRIN• ETHION• CHLOR• EPDXIDE LINDANE THION• CHLOR• TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN • 1984 11... <.01 <.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- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION DATE (UG/L) (UG/L) LUG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN • 1984 11... <.01 <.01 <.01 <.01 <.10 <.1 <1 <.01 -- 112 RIO DE LA PLATA BASIN 50046000 RIO DE LA PLATA AT TOA ALTA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 SED. SUSP. STREAM- SEDI- SIEVE FLOW, MENT, DIAM. INSTAN- SUS- X FINER TIME TANEOUS PENDED THAN DATE (CFS) (MG/L) .062 MM OCT . 1983 03... 1305 526 15 93 DEC 07... 1410 23 FE8 , 1934 03... 1520 11 13 100 APR 17... 1350 2.7 42 60 JUN 11... 1235 100 15 100 AUG 02... 1700 60 212 100 SEP 19... 1820 267 75 19... 1835 169 78 19... 1845 171 30 19... 1850 158 85 19... 1855 139 38 19... 1900 144 36 19... 1905 159 82 19... 1910 153 84 19... 1915 154 74 19... 1925 155 77 113 OCEAN° A LANrico AN JUAN 049920 o o Drainage boundaries indeterminate 660 in iirnestant terrane 0496 0491 ageoe r, Jose 048519 049310 Limestone gneaus and seaimentor y rocks 80 \Th, ( I • 90 Represo ds 0 ftri, Piedras y047 vit 0488( Ga‘NABO k 1.ego Les Curios TRuJiLio ALTO • ( Drainage boundary /P— • 'q• 47 AGUAS BUENAS in Rt'c, de la Parts, be., fifil Grande de Lei. basin CIDRA EXPLANATION A 0490 LOW-FLOW STATION AND NUMBER V 0488 QUALITY-OF-WATER STATION AND NUMBER • 42 WELL AND WELL NUMBER „Map area mos Roo. 4 ri; 7 lc mETERS „cAo u e C3A4,1114. Figure 16.--Rio Hondo to Rio Puerto Nuevo basins. RIO HONDO BASIN 50047530 RIO HONDO AT FLOOD CHANNEL NEAR CATARO,PR WATER-QUALITY RECORDS LOCATION.--Lat 18°26'13", long 66°09'36", at Rio Hondo Channel, 800 ft (245 m) below junction with Rio Hondo, 0.9 mi (1.5 km) downstream from bridge on de Diego Expressway and 1.1 mi (1.8 km) above mouth. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI CIFIC SOLVED CHEM- FECAL, 'ECAL, SAM- CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR PIING DUCT- (STAND- TEMPER- 313- DIS- CENT (HIGH UM-MF (COLS. TIME DEPTH ANCE ARO ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER (FEET) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1983 25... 1210 1.00 33100 8.4 31.0 6.4 15.0 226 1100 K11000 1200 DEC 06... 1250 1.00 7730 7.5 30.0 3.5 .0 0 290 K1100000 260000 MAR , 1984 22... 1305 1.00 36400 8.3 29.0 3.0 11.4 168 40 <100 APR 12... 0955 1.00 40000 '.4 30.0 5.0 6.6 100 32000 K110 JUL 12... 1125 1.00 565 7.6 30.0 50 4.0 53 16 K88000 2800 AUG 31... 1530 1.00 11000 7.7 32.5 3.2 .0 0 130 >600000 6400 HARD". MAGNE- SODIUM POTAS'." ALKA"" CHLO- FLUO- NESS, CALCIUM STUN, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, HARD- NONCAR- DIS- On- DIS- SORT,- 315- FIELD OIS." DIS- DIS- NESS, BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED (MG/L (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT , 1983 25... 3900 3700 220 810 6800 48 240 139 1700 12000 .70 DEC 06... 158 2200 MAR , 1984 22... -- 173 19000 APR 12... 1400 1200 280 170 7300 87 220 189 1600 11000 .60 JUL 12... - 63 AUG 31... 1000 840 99 190 1600 22 65 188 390 3100 .40 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L OM- SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 25... 6.8 22000 76 .06 .04 .10 .98 3.6 4.6 4.7 DEC 06... 19 .01 <.10 6.5 4.5 11 MAR , 1984 22... 81 .01 <.10 2.8 1.9 4.7 APR 12... 5.8 21000 43 .02 <.10 6.3 .20 6.5 JUL 12... 49 .17 .03 .20 .24 .76 1.0 1.2 AUG 31... 17 5600 5 .08 .02 .10 9.4 4.6 14 14 K = non-ideal count 114 115 RIO HONDO BASIN 50047530 RIO HONDO AT FLOOD CHANNEL NR CATASO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE NITRO- GENE TOTAL (MG/L AS NO3) PHOS- PHORUS, TOTAL (MG/L AS P) ARSENIC TOTAL (UG/L AS AS) BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) CHRO MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) LEAD,. TOTAL RECOV- ERABLE (UG/L AS PB) MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) SELE- NIUM, TOTAL (UG/L AS SE) SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) OCT , 1983 25... 21 DEC 06... MAR , 1984 22... APR 12... JUL 12... 5.3 AUG 31... 62 .64 .24 2.6 2.3 .25 3.6 2 3 100 <100 -- 1 <1 2 <1 4 2 <.1 .6 <1 <1 <1 1 116 RIO DE BAYAMON BASIN 50047600 RIO DE BAYAMON NEAR AGUAS BUENAS, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°14'39", long 66°08'39", at bridge on Highway 156, and 2.9 mi (4.7 km) west of Aguas Buenas plaza. DRAINAGE AREA.--18.5 sq mi (47.9 sq km). PERIOD OF RECORD.--Water years 1958-65, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI- STREP­ SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PM TJR­ OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STANO­ TEMPER- PIO­ DIG- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE A40 ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) CMG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1983 07... 1010 28 242 8.0 24.5 15 3.5 105 160 390 DEC 15... 1400 21 250 8.4 23.5 2.0 9.3 119 <10 K160 220 MAR , 1934 14... 1620 26 235 8.7 24.5 3.5 3.3 139 12 K110 460 MAY 04... 0930 le 243 8.0 24.0 1.1 13.5 128 <10 200 700 JUL 10... 1040 12 279 7.8 25.0 4.4 8.6 107 320 630 AUG 15... 1030 26 213 7.8 25.5 3.5 3.3 110 <10 K730 300 MARC- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS, CALCIUM SLUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- ors- 01$- DIS- SORP- 3IS- FIELD DIS- DIS- DIS- (MG/L 80NATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) AS CL) AS F) OCT , 1933 07... 92 0 21 9.5 17 .8 2.1 92 10 16 .10 DEC 15... 93 MAR , 1984 14... 90 MAY 04... 87 0 19 9.6 17 .8 1.9 93 9.4 17 .10 JUL 10... 107 AUG 15... 77 0 18 7.3 13 .7 3.0 80 11 16 .10 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO.- NITRO- NITRO... NITRO- GEN,AM." DIS." CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (4G/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1933 07... 25 160 12 8 (.01 .40 <.01 .50 .90 DEC 15... 4 -..". <.01 .60 .04 .36 .40 1.0 MAR , 1984 14... 4 <.01 .20 .08 .32 .40 .60 MAY 04... 23 150 7.4 2 <.01 .20 <.01 .90 1.1 JUL 10... 5 .68 .02 .70 .01 .69 .70 1.4 AUG 15... 20 140 9.2 5 .19 .01 .20 .04 .36 .40 .60 K = non-ideal count' 117 RIO DE BAYAMON BASIN 50047600 RIO DE BAYAMON NEAR AGUAS BUENAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHR1- BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- P'lOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV­ TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L CMG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS BA) AS CD) AS CR) AS P8) AS HG) AS SE) AS AG) OCT , 1983 07... 4.0 .06 2 200 1 3 4 .1 <1 <1 DEC 15... 4.4 .05 MAR . 1934 14... 2.7 .04 MAY 04... 4.9 .33 1 100 1 7 1 .1 <1 <1 JUL 10... 6.2 .04 AUG 15... 2.7 .08 118 RIO DE BAYAMON BASIN 50047990 RIO GUAYNABO NEAR BAYAMON, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°22'32", long 66°07'59", at bridge on Highway 833, 0.2 mi (0.3 km) upstream from Rio de Bayamin, and 2.3 mi (3.7 km) southeast of BayamOn Plaza. DRAINAGE AREA.--73.2 sq mi (189.6 sq km). PERIOD OF RECORD.--Water years 1958, 1964, 1971-73, 1976, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI- STREP- SPE- ors- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TOR- OXYGEN, (PER- IC AL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- UM-MC (COLS. TIME TANEOUS ANCE ARD ATURE ITT (HIGH SOLVED SCATU TR- LEVEL) (COLS./ 0ER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1983 17... 1335 29 374 7.4 27.5 9.6 4.5 58 56 K8000 4700 DEC 19... 1220 19 435 7.3 25.5 23 1.4 17 27 4500 700 MAR , 1984 20... 1135 13 450 7.9 25.0 5.3 3.6 44 20 K7700 740 MAY 11... 1055 7.7 568 7.2 26.0 1.5 .0 0 56 >60000 3300 JUL 09... 1250 21 506 7.3 29.0 4.0 3.0 39 21 K1200 440 AUG 27... 1215 56 330 7.4 27.0 1.8 5.1 64 10 K550000 K93000 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUD- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- 015- 015- On- SORP- DIS- cIELO On- DIS- OIS- (MG/L 80NATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT 1983 17... 140 DEC 19... MAR , 1934 20... MAY 11... 150 JUL 09... AUG Z7... 110 6 38 11 25 1 3.6 134 21 30 .20 161 154 0 41 12 42 2 5.9 187 23 51 .20 156 0 31 3.3 20 .8 3.7 113 26 25 .10 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO-. NITRO- GEN,AM* DIS- CONSTI- On- AT 105 GEN, GEN, GEN, GEN, GEN, MONZA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENOED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE 5102) (MG/L) DAY) CMG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1933 17... 27 240 18 35 .42 .08 .50 2.0 .40 2.4 2.9 DEC 19... 6 .07 .03 .10 3.2 .20 3.4 3.5 MAR ,1984 20... 4 .01 <.10 3.0 .70 3.7 MAY 11... 29 320 6.5 5 .02 <.10 8.1 .00 6.6 JUL 09... 8 .08 .02 .10 3.2 .60 3.8 3.9 AUG 27... 20 200 31 75 1.1 .09 1.2 1.4 1.2 2.6 3.8 K = non-ideal count 119 RIO DE BAYAMON BASIN 50047990 RIO GUAYNABO NEAR BAYAMON, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE NITRO- GEN, TOTAL (MG/L AS NO3) PROS- PMORUS, TOTAL (MG/L AS P) ARSENIC TOTAL (UG/L AS AS) 3ARIUM, TOTAL RECOV - ERA3LE (UG/L AS BA) CADMIUM TOTAL RECOV- ERABLE (UG/L AS CO) CHRO- MIUM, TOTAL RECOV- ERA3LE (UG/L AS CR) LEAD, TOTAL RECOV- ERABLE (UG/L AS P3) MERCURY TOTAL RECOV- ERABLE (UG/L AS MG) SELE- NIUM, TOTAL (UG/L AS SE) SILVER, TOTAL RECOV- ERA3LE (UG/L AS AG) OCT . 1983 17... 13 DEC 19... 15 MAR , 1984 20... MAY 11... JUL 09... 17 AUG 27... 17 .58 1.0 .45 2.2 .92 .35 1 2 100 100 <1 2 <1 <1 1 1 <.1 .3 <1 <1 <1 <1 120 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 Highway 2, and 3.2 mi (5.1 km) above mouth. DRAINAGE AREA.--71.9 sq mi (186.2 sq km). PERIOD OF RECORD.--Water years 1974 to current year. REMARKS.--Prior to 1979 sampling site was 0.8 mile (1.3 km) downstream but was changed because of flood channel construction. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN CCLI- STREP- SPE- 015- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL. FECAL, FLOW, CON- PH TJR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- ors- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARC ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1933 17... 1045 74 316 7.4 26.5 65 5.3 62 40 K113000 K44000 DEC 19... 0950 35 412 7.2 25.0 3.2 4.2 51 17 550 K600 MAR , 1984 22... 1035 20 476 7.8 26.5 5.6 7.8 97 13 K600 MAY 09... 1535 19 558 7.6 31.0 2.9 8.0 108 23 410000 36000 JUL 09... 1040 26 423 7.2 29.0 9.4 4.8 62 12 4600 990 AUG 28... 1525 50 356 7.4 30.5 7.5 5.0 66 13 30000 500 HARD- MANE- SODIUM POTAS- ALKA- CHLO- FLUO- HARD-. NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- 015- DIS- SORP- DIS- FIELD DIS- DIS- DI'S- (MG/L 80NATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) AS CL) AS C) OCT , 1983 17... 120 3 31 9.9 19 .8 2.9 115 17 22 .20 DEC 19... 153 MAR , 1984 22... 179 MAY 09... 160 0 41 13 38 1 5.0 187 24 48 .20 JUL 09... 152 AUG 28... 130 0 35 11 22 .9 3.3 133 27 27 .20 SOLIDS, SILICA, SUM OF SOLIDS, SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- SOLVED TUENTS, DIS- AT 105 GEN, GEN, SOLVED DEG. Cr NITRATE NITRITE GEN, NO2+NO3 GEN, GEN, MONIA + AMMONIA ORGANIC ORGANIC NITRO- GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE AS SI02) SOLVED (MG/L) PER DAY) PENDED (MG/L) (MG/L AS N) (M3/L AS N) (MG/L AS N) (MG/L AS N) (MG/L AS N) (MG/L AS N) (MG/L AS N) OCT • 1983 17... 23 190 39 110 .55 .15 .70 1.2 1.0 2.2 2.9 DEC 19... 6 .30 .10 .40 2.5 .60 3.1 3.5 MAR • 1984 22... .15 .15 .30 3.5 .80 4.3 4.6 MAY 09... 29 310 16 20 .11 .09 .20 9.4 .00 9.0 9.2 JUL 09... 24 .46 .14 .60 1.6 .00 1.6 2.2 AUG 28... 24 230 30 38 .40 .20 .60 .89 .61 1.5 2.1 K = non-ideal count 121 RIO DE BAYAMON BASIN 50048510 RIO DE BAYAMON AT FLOOD CHANNEL AT BAYAMON, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS BA) AS CD) AS CR) AS PS) AS HG) AS SE) AS AG) OCT , 1983 17... 13 .42 1 <100 1 8 5 <.1 <1 <1 DEC 19... 15 .97 MAR , 1994 22... 20 .44 MAY 09... 41 1.7 2 100 2 1 3 .2 <1 (1 JUL 09... 9.7 .42 AUG 28... 9.3 .39 - - CHLOR- DI- PC 8, ALORIN, DANE, ODD, DOE, DDT, AZINON, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL r 1984 09... 1040 <.1 <.01 <.1 <.01 <.01 (.01 .16 HEPTA- METH- DI- ENDO- HE'TA- CHLOR MALA- OXY- ELORIN SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1984 09... <.01 <.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 TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL , 1984 09... <.01 <.01 <.01 <.01 .10 <.1 <1 <.01 122 RIO PUERTO NUEVO BASIN 50048800 RIO PIEDRAS NEAR RIO PIEDRAS, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°22'15", long 66°03'40", at bridge on Winston Churchill Avenue in the El Senorial Housing area, 0.5 mi (0.8 km) west of Highway 176, and 2.5 mi (4.0 km) southwest of Rio Piedras plaza. DRAINAGE AREA.--8.17 sq mi (20.9 sq km). PERIOD OF RECORD.--Water years 1972 to current year. WATER QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLT- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TJR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1983 12... 1235 5.8 328 7.7 27.0 ?.2 3.2 103 71 37000 K12000 DEC 12... 1125 5.0 376 7.4 23.5 2.4 6.1 71 15 50000 7200 MAR , 1984 20... 1445 4.5 382 7.9 25.3 16 5.6 105 23 K82000 40000 MAY 10... 0940 1.9 390 7.4 25.5 1.0 8.0 98 12 K1400 900 JUL 9... 1240 4.0 429 7.9 27.5 5.4 7.8 99 <10 4300 5900 AUG 24... 1210 3.6 352 7.8 27.0 .70 3.3 103 <10 3500 4500 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO-- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- CIS- On- SORP- DIS- FIELD DIS- DIS- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MS/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT , 1983 12... 120 3 31 9.4 20 .8 2.5 115 19 25 .10 DEC 12... 140 MAR , 1984 20... 143 MAY 10... 150 0 39 12 26 1 1.8 157 15 29 .20 JUL .... -- 09... 142 AUG 24... 130 0 35 11 22 .9 2.1 135 16 27 .20 SOLIDS, SOLIDS, NITRO.. SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- DIS-- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENOED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 12... 30 208 3.3 10 .79 .01 .80 .18 .42 .60 1.4 DEC ... 12... 26 1.1 .17 1.3 .75 .00 .70 2.0 MAR , 1984 20... 4 .77 .13 .90 .64 .26 .90 1.8 MAY 10... 35 250 1.3 4 .18 .02 .20 .61 4.4 5.0 5.2 JUL .... 09... 9 .47 .03 .50 .57 .00 .50 1.0 AUG 24... 35 230 2.2 14 <.01 .40 .12 .48 .60 1.0 K = non-ideal count RIO PUERTO NUEVO BASIN 50048800 RIO PIEDRAS NEAR RIO PIEDRAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- 8ARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN. PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS 3A) AS CD) AS CR) AS P8) AS HG) AS SE) AS AG) OCT , 1983 12... 6.2 .21 3 300 1 4 3 <.1 <1 <1 DEC 12... 8.9 .34 MAR , 1984 20... 8.0 .37 - - MAY 10... 23 .23 2 100 2 <1 <1 .1 <1 <1 JUL 09... 4.4 .15 - - - - AUG 24... 4.4 .24 CHLOR- DI- PCB, ALDRIN, DANE, ODD, ODE, DDT, AZINON, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/I) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL , 1984 09... 1240 <.1 <.01 <.1 <.01 <.01 <.01 .01 HEPTA- D/- ENDO- HEPTA- CHLOR MALA- ELDRIN SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINOANE THION, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) METH- OXY- CHLOR, TOTAL (UG/L) JUL 1984 09... <.01 <.01 <.01 <.01 <.01 <.01 <.01 .02 (.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL , 1984 09... .01 (.01 <.01 <.01 <.10 <.1 <1 (.01 123 124 RIO PUERTO NUEVO BASIN 50049100 RIO PIEDRAS AT HATO REY, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°24'34", long 66°04'10", at bridge on Avenida Pifiero at Expreso Las Americas, and 0.8 mi (1.3 km) southwest of Hato Rey. DRAINAGE AREA.--15.4 sq mi (39.9 sq km). PERIOD OF RECORD.--Water years 1971 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN CDLI- 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. TIME TANEOUS ANCE ARO ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHas) UNITS) (DEG C) (NTU) CMG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1983 12... 1455 14 372 7.6 30.5 23 5.6 75 67 333000 K15000 DEC 12... 1320 13 416 7.5 27.5 1.3 5.6 34 17 K120000 5000 MAR , 1984 19... 1355 11 411 8.2 30.5 2.5 6.7 89 15 K7900 K1300 MAY 10... 1215 10 432 7.6 30.0 7.8 7.5 130 15 29000 2100 JUL 09... 1555 11 436 7.9 30.0 5.1 4.6 61 18 380000 34000 AUG 24... 0945 9.4 387 7.4 27.5 3.0 4.6 58 24 K17000 9000 HARD- MAGNF- SODIUM POTAS- ALKA- CHIC- FLUO- HARD- NESS. CALCIUM SIUM, SODIUM, AD- SLUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- On- OIS- DIS- SORP- DIS- FIELD On... DIS- DIS- DATE (MG/L AS CAC03) 80NATE (MG/L CAC03) SOLVEO (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) SOLVED (MG/L AS SO4) SOLVED (MG/L AS CL) SOLVED (MG/L AS F) OCT , 1983 12... 130 0 37 9.2 24 .9 3.4 131 17 28 .20 DEC 12... 148 MAR , 1984 19... 151 MAY 10... 140 0 41 11 34 1 3.6 161 20 38 .20 JUL 09... 153 AUG 24... 140 0 41 9.6 26 1 3.4 147 19 30 .20 SOLIDS, SOLIDS, NITRO.... SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO... NITRO- GEN,A4... DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. Co NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE AS SI02) SOLVED (MG/L) PER DAY) PENOED (MG/L) (MG/L AS N) (MG/L AS N) (MGIL AS 4) (MG/L AS N) (MG/L AS N) (MG/L AS N) (MG/L AS N) OCT , 1983 12... 27 224 8.5 12 1.1 .16 1.3 .88 .22 1.1 2.4 .EC 12... 24 1.5 .23 1.7 1.1 .40 1.5 3.2 MAR , 1984 19... 4 1.1 .11 1.2 .21 1.7 1.9 3.1 MAY 10... 28 270 7.3 18 .47 .13 .60 1.5 3.6 5.1 5.7 JUL 09... 14 .92 .18 1.1 .94 .56 1.5 2.6 AUG 24... 28 250 6.2 2 1.0 .16 1.2 .39 .81 1.2 2.4 K = non-idoal count 125 RIO PUERTO NUEVO BASIN 50049100 RIO PIEDRAS AT HATO REY, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV­ TOTAL TOTAL TOTAL ERA3LE ERABLE ERA8LE ERABLE ERA3LE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L CUG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS 3A) AS CD) AS CR) AS P3) AS MG) AS SE) AS AG) OCT , 1983 12... 11 .52 3 200 2 4 9 <.1 <1 <1 DEC 12... 14 .95 MAR , 1984 19... 14 .52 MAY 10... 25 .80 2 100 2 3 14 1.1 <1 <1 JUL 09... 12 .54 AUG 24... 11 .47 126 RIO PUERTO NUEVO BASIN 50049820 LAGUNA SAN JOSE NO. 2 AT SAN JUAN, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°25'46", long 66°02'10", 0.2 mi (0.3 km) east of Cafio de Martin Pena, and 650 ft (200 m) south of Isla Guachinango. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, COLI- STREP- SOLIDS, SPE- DIS- FORM, TOCOCCI ALKA- RESIDUE CIFIC SOLVED FECAL, FECAL, LINITY AT 105 SAM- CON- PH OXYGEN, (PER- 0.7 KF AGAR FIELD DEG. Cr PLING DUCT- (STAND- TEMPER- DIS- JM-MF (COLS. (MG/L SUS- TIME ANCE ATURE CENT ?ENDED DEPTH ARD SOLVED SATUR- (COLS./ PER AS (FEET) (UMHOS) UNITS) (DEG C) (143/L) ATION) 100 ML) 100 ML) CACO3) (MG/L) OCT , 1933 25... 0850 1.00 15500 9.4 29.5 4.4 61 K740 2700 100 44 DEC 06... 1030 1.00 18403 7.9 23.0 2.0 27 110090 9500 137 62 MAR , 1984 21... 1040 1.00 25000 8.8 27.0 8.6 117 47000 540 149 50 APR 12... 1335 1.00 30000 9.0 30.0 18.0 264 600 K170 166 53 JUL 11... 1115 1.00 21500 9.1 29.0 10.2 142 9900 510 131 26 AUG 31... 1125 1.00 19000 8.9 30.5 10.0 140 20000 500 135 10 NITRO- NITRO- NITRO- NITRO- NITRO- NITRO- GFN,AM- GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- PROS- CARBON, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, ORGANIC TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE AS N) AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) AS C) OCT , 1983 25... .08 .02 .10 .63 3.9 4.5 4.6 20 .39 6.7 DEC 06... .04 (.10 2.3 1.3 4.1 .61 14 MAR , 1984 21... .03 <.10 .31 3.5 3.8 .61 10 APR 12... .02 (.10 .14 5.1 5.2 .65 15 JUL 11... .05 .05 .10 .79 .81 1.6 1.7 7.5 .31 13 AUG 31... <.01 <.10 .08 2.6 2.7 .48 9.5 K = non-ideal count DATE 127 RIO PUERTO NUEVO BASIN 50049920 BAHIA DE SAN JUAN NO. 5 AT SAN JUAN, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°26 37", long 66°05'11", 0.4 mi (0.6 km) west of Puente de la Constituci6n, and 0.5 mi (0.8 km) south from U.S. Naval Reservation. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, Coil- STREP- SOLIDS, SPE- OIS- FORM, TOCOCCI ALKA-. RESIDUE CIFIC SOLVED FECAL, FECAL, LINITY AT 105 SAM- CON- PH OXYGEN, (PER- 0.7 KF AGAR FIELD DEG. C, PLING DUCT- (STAND- TEMPER- On- CENT UM-MF (COLS. (MG/L SUS- TIME DEPTH ANCE ARO ATURE SOLVED SATUR- (COLS./ PER AS PENDED DATE (FEET) (UMHOS) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CAC03) (MG/L) OCT , 1983 25... 1035 1.00 44300 8.0 29.5 4.4 67 K7000 K1000 123 98 DEC 06... 1125 1.00 47400 8.0 23.5 5.2 79 2000 K600 124 222 MAR , 1934 21... 1215 1.00 45100 8.1 28.0 5.1 77 37000 K180 138 116 APR 12... 1155 1.00 44000 7.8 23.5 4.1 62 K2303000 41000 141 56 JUL 11... 1300 1.00 14600 7.4 28.3 1.5 20 230000 74000 145 30 AUG 31... 1350 1.00 15000 7.9 29.0 4.2 57 K180000 9800 91 24 NITRO- NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- PHOS- CARBON, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, ORGANIC TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE AS N) AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) AS C) OCT , 1983 25... <.01 <.10 .57 .73 1.3 .28 4.0 DEC 06... .09 .01 .10 .42 .28 .70 .80 .20 4.0 MAR , 1984 21... .03 <.10 .75 .55 1.3 .35 3.8 APR 12... .05 .05 .10 1.4 .80 2.2 2.3 10 .57 4.0 JUL 11... <.01 <.10 .09 2.? 3.0 -- .45 7.4 AUG 31... .03 <.10 .49 .71 1.2 .30 K . non-ictal count 4.0 129 Coostoi Dosin Cocmiol lads:o 40620 RIO GRANDE a Rio Pierfros bdsin EE .'3 7- , , ',' I 11- Aeons, 57 •, :{."-c7 , --------- (, Ri`o floprs (fr----•-•-----644 \,., Ban+a bash, go I..o,:zo ', fl}' \ '') \ '- / 057 ( / i 05705 \ . ''''''"'' / a ....:111 1........„. 52 5i615 . ...- tr...00, Cif' / .-- •.. . ) 1 ,' 1.-- , 654 55310 '; AGUAS BUENAS 5a 250 ? ';';agb%cs , N't- N\ 05 0556. e765 05 it' 64 \ ....,. i 1 \ ( \ 051140 , 51 Reb de to Pkno basin rooms bosin EXPLANATION A0509 SURFACE—WATER STATION AND NUMBER Rki i7f,tneht A0619 LOW—FLOW STATION A Pat bosi AND NUMBER V 0564 QUALITY—OF—WATER Mop +area 7 6tioyones basis STATION AND NUMBER 52 WELL AND WELL NUMBER ?,,,tAYAGVEX A S Figure 17.--Rio Grande de Loiza basin. 1 130 RIO GRANDE DE LOIZA BASIN 50050300 QUEBRADA BLASINA NEAR CAROLINA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°23'27", long 65°58'28", at bridge on Highway 3, 1.4 mi (2.3 km) south of Valle Arriba Heights housing area, and 1.2 mi (1.9 km) west-southwest of Carolina plaza. DRAINAGE AREA.--2.96 sq mi (7.67 sq km). PERIOD OF RECORD.--Water years 1973 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI- STREP.. SPE". ors- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- 3XYGEN, (PER... ICAL 0.7 KF AGAR I4STAN.... DUCT- (STAND- TEMPER- BID- DIS-. CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARC ATURE ITY SOLVED SATUR... LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) CMG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1983 12... 0950 5.6 588 7.2 23.5 (1.0 .0 0 130 K6400000 5200000 DEC 08... 0905 7.6 588 7.2 25.0 5.3 .0 0 100 K1000000 2400000 MAR , 1984 15... 0935 5.2 556 7.7 25.5 53 .4 5 67 3700030 4300000 MAY 02... 1445 4.0 679 7.4 27.5 2.4 .0 0 100 11000000 4400000 JUN 23... 1410 6.9 605 7.2 30.0 3.3 3.0 106 83 2300000 28000 AUG 22... 1000 6.4 493 7.4 29.0 5.5 1.2 15 43 K1300000 K190000 HARD- MAGNE- SODIUM POTAS- ALKA-.. CHLO- FLUO- HARD.- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE. RIDE. NESS NONCAR- DIS- DM'. DIS." SOR0- DIS- FIELD DIS- DIS- DIS DATE (MG/L BONATE AS (MG/L CACO3) CACO3) SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) SOLVED (MG/L AS NA) TION SOLVED (MG/L SOLVED SOLVED RATIO (MG/L AS (MG/L (MG/L AS K) C4CO3) AS SO4) AS CL) SOLVED (MG/L AS F) OCT • 1983 12... 150 0 48 3.4 45 2 5.7 134 19 49 .20 DEC OS... 174 MAR , 1984 15... .... 134 MAY 02... 150 0 46 9.1 56 2 6.5 201 24 74 .20 JUN 28... 174 AUG 22... 140 0 42 8.0 39 2 6.2 169 28 45 .20 SOLIDS, SOLIDS, NITRO- SILICA, SUM Of SOLIDS, RESIDUE NITRO- NITRO... NITRO- NITRO... NITRO- GEN,AM- DIS- CONSTI... DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO.' SOLVED TUENTS, SOLVED DEG. Cr lITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER FENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MGM AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT • 1933 12... 29 310 4.8 6 <.01 <.10 7.9 8.1 16 DEC 03... 22 .04 (.10 8.4 5.6 14 MAR • 1934 15... •...•. •....... 60 -- .02 <.10 8.0 3.0 11 MAY 02... 24 360 3.8 12 .02 <.10 8.8 6.2 16 JUN 23... 14 .09 .01 .10 9.9 2.1 12 12 AUG 22... 19 290 5.0 54 .77 .13 .90 6.0 2.5 8.5 9.4 K = non-ideal count 131 RIO GRANDE DE LOIZA BASIN 50050300 QUEBRADA BLASINA NEAR CAROLINA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE NITRO- GEN, TOTAL (MG/L AS NO3) PHOS- PHORUS, TOTAL (MG/L AS P) CMR0- SARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, TOTAL TOTAL TOTAL TOTAL TOTAL SELF- TOTAL ARSENIC RECOV - RECOV- RECOV- RECOV- RECOV- NIUM, RECOV­ TOTAL ERA3LE ERA3LE ERA3LE ERABLE ERABLE TOTAL ERABLE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS AS) AS 3A) AS CO) AS CR) AS P3) AS HG) AS SE) AS AG) OCT • 1983 12... DEC 08... MAR , 1984 15... MAY 02... JUN 28... 53 AUG 22... 42 .26 .22 1.6 3.3 3.0 . 1.7 4 2 200 <100 1 1 2 1 2 7 (.1 .3 <1 <1 <1 <1 132 RIO GRANDE DE LOIZA BASIN 50050900 RIO GRANDE DE LOIZA AT QUEBRADA ARENAS, PR LOCATION.--Lat 18°07'10", long 65°59'22", Hydrologic Unit 21010005, at intersection of Highways 181 and 9990, 0.2 mi (0.3 km) above con­ fluence 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. Altitude of gage is 175 ft (53.3 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--7 years (1978-84), 30.6 cu ft/s (0.866 cu m/s), 69.26 in/yr (1,759 mm/yr), 22,170 acre-ft/yr (27.3 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, 2.8 cu ft/s (0.079 cu m/s) May 5,6, 1979. EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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) Nov. 5 1845 *11,700 331 14.78 4.505 June 10 0815 2,590 73.3 8.85 2.697 Feb. 15 2030 4,410 125 10.46 3.188 Sept. 17 1345 2,600 73.6 8.86 2.700 June 10 0515 2,850 80.7 9.11 2.777 Sept. 20 0715 2,880 81.6 9.14 2.786 Minimum discharge, 4.2 cu ft/s (0.119 cu m/s) May 21. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 37 40 12 20 8.7 14 7.8 5.4 31 33 14 24 2 24 15 191 14 8.6 13 7.2 5.5 15 21 18 15 3 21 16 23 13 12 13 7.5 5.4 12 18 13 45 4 19 289 18 12 17 12 7.2 5.5 17 63 50 18 5 17 736 16 11 14 11 7.6 5.2 21 157 18 34 6 16 119 19 11 14 12 8.0 6.0 75 32 15 21 7 16 41 15 11 12 11 8.1 5.5 134 24 13 15 8 15 31 15 10 9.5 11 7.5 5.1 40 21 12 14 9 30 27 14 12 9.2 12 7.1 5.2 24 20 12 13 10 16 23 14 21 13 9.5 7.2 7.4 369 19 11 23 11 15 22 15 11 10 8.9 7.5 5.4 44 19 11 18 12 17 20 14 12 107 8.7 6.9 5.2 45 18 11 44 13 34 19 13 69 87 9.0 6.4 6.1 44 18 10 42 14 19 18 12 49 33 16 6.4 5.7 32 24 9.9 56 15 23 17 14 17 372 9.1 6.4 5.3 24 21 11 25 16 17 18 15 17 137 8.7 6.4 4.9 31 13 12 36 17 14 17 14 32 36 9.4 6.6 4.6 25 17 11 207 18 28 16 14 22 25 8.8 6.2 4.6 21 16 9.9 132 19 23 15 12 15 21 8.3 6.1 5.4 21 16 9.9 77 20 15 15 12 30 18 8.0 6.5 5.1 20 16 10 302 21 16 15 11 15 17 7.8 7.6 4.8 19 18 9.8 82 22 19 14 12 17 17 8.3 7.6 5.4 19 17 10 44 23 13 14 12 13 16 9.3 7.1 6.7 18 18 9.9 37 24 12 14 11 12 15 7.8 6.4 5.3 17 16 9.9 30 25 12 13 11 15 15 7.5 6.0 9.9 17 14 9.8 28 26 15 12 11 13 14 7.4 5.9 21 16 16 29 24 27 12 13 12 11 15 7.1 7.6 18 16 16 21 22 28 11 12 16 11 13 6.7 7.4 14 16 14 12 22 29 16 13 13 9.8 13 7.7 5.7 12 17 35 11 27 30 20 13 24 9.4 --- 7.1 5.5 106 21 19 13 31 31 13 --- 41 3.9 6.7 --- 26 --- 14 14 --- TOTAL 575 1647 646 544.1 1099.0 296.8 207.4 337.6 1221 788 431.1 1508 MEAN 18.5 54.9 20.8 17.6 37.9 9.57 6.91 10.9 40.7 25.4 13.9 50.3 MAX 37 736 191 69 372 16 8.1 106 369 157 50 302 MIN 11 12 11 8.9 8.6 6.7 5.5 4.6 12 14 9.8 13 CFSM 3.08 9.15 3.47 2.93 6.32 1.60 1.15 1.82 6.78 4.23 2.32 8.38 IN. 3.56 10.21 4.00 3.37 6.81 1.84 1.29 2.09 7.57 4.83 2.67 9.35 AC-FT 1140 3270 1280 1080 2180 589 411 670 2420 1560 855 2990 CAL YR 1983 TOTAL 10468.6 MEAN 28.7 MAX 736 MIN 4.9 CFSM 4.78 IN 64.89 AC-FT 20760 WTR YR 1984 TOTAL 9301.0 MEAN 25.4 MAX 736 MIN 4.6 CFSM 4.23 IN 57.66 AC-FT 18450 133 RIO GRANDE DE LOIZA BASIN 50050900 RIO GRANDE DE LOIZA AT QUEBRADA ARENAS, PR--Continued WATER QUALITY RECORDS PERIOD V' RECORD.--WAT.ER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOW. SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ OATE TIME INSTANTANEOUS OUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UPiIOS) (DEG C) (CFS) (UMNOS) (DEG C) OCT, 12 1045 14 139 25.5 MAR. 21 1606 7.3 155 28.0 ?Olt, 07 15)8 39 172 26.0 APR, 11 1245 7.4 152 27.5 OEC, 14 1300 12 153 24.0 MAY, 21 1501 4.7 152 29.0 JAN. 13 1217 24 158 23.5 JUN. 14 1235 34 125 29.0 FES, 16 1308 79 39 22.5 AUG, 16 1030 12 145 28.0 MAR. 09 1023 16 145 22.0 134 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 to September, 1984. GAGE.--Water-stage recorder. Altitude of gage is 330 ft (100 m), from topographic map. REMARKS.--Records fair. EXTREMES FOR CURRENT PERIOD.--Peak discharges above base 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) Feb. 15 1930 1,430 40.5 9.31 2.838 June 10 0700 *6,300 178 15.12 4.609 Minimum discharge, 0.69 cu ft/s (0.020 cu m/s) Apr. 9-13, 15,16. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2.0 1.7 1.6 .86 .96 1.8 1.9 4.1 2.2 2 1.8 1.5 1.6 .86 .93 1.5 2.3 6.2 1.8 3 1.7 1.5 1.6 .86 .97 1.2 1.4 1.4 1.7 4 1.6 1.9 1.5 .31 1.0 1.3 30 6.6 1.9 5 1.5 1.6 1.5 .80 .93 1.2 64 2.3 16 6 1.5 1.5 1.5 .82 .93 10 6.2 1.3 5.4 7 1.5 1.5 1.5 .84 .97 26 2.8 1.1 2.7 8 1.5 1.5 1.4 .85 1.0 9.8 2.0 .99 2.1 9 1.6 1.9 1.4 .74 .97 5.3 1.7 .95 2.2 10 1.8 4.2 1.4 .71 1.1 295 1.8 .86 2.6 11 1.6 3.7 1.3 .72 1.2 15 1.5 .83 2.3 12 3.2 8.8 1.3 .71 1.1 7.0 1.3 .83 4.7 13 14 33 1.3 .72 1.8 20 1.1 .82 19 14 12 11 1.4 .74 2.1 9.9 1.5 .82 86 15 3.8 106 1.3 .74 1.4 5.9 1.5 .84 10 16 2.6 88 1.2 .73 1.3 5.9 1.2 1.0 11 17 2.0 6.6 1.2 .77 1.2 5.3 1.1 .92 24 18 1.7 3.3 1.2 .80 1.1 3.8 .97 .89 54 19 1.7 2.3 1.2 .79 1.1 3.2 1.0 .89 41 20 14 1.9 1.1 .80 1.1 2.6 1.1 1.1 95 21 3.5 1.7 1.1 .86 1.1 2.3 1.6 1.0 38 22 1.8 1.6 1.1 .93 1.0 2.1 1.3 .87 13 23 1.7 1.6 1.2 .93 1.1 1.8 1.2 .87 7.3 24 1.8 1.6 1.2 .93 1.1 1.7 1.0 .82 5.2 25 1.8 1.6 1.1 .90 2.0 1.6 .98 .34 4.2 26 1.7 1.6 1.0 .93 14 1.8 1.1 2.8 3.7 27 1.7 1.7 1.0 1.4 2.1 1.5 .98 3.8 3.4 28 1.9 1.7 .97 1.7 2.2 1.4 .99 2.4 3.7 29 1.7 1.6 .96 1.1 1.5 2.0 1.7 1.7 3.1 30 1.6 --- .91 1.0 18 1.6 2.3 16 5.0 31 1.6 .88 --- 3.1 --- 1.3 4.1 --- TOTAL 93.9 298.1 38.92 26.35 70.36 449.5 140.82 69.94 472.2 MEAN 3.03 10.3 1.26 .88 2.27 15.0 4.54 2.26 15.7 MAX 14 106 1.6 1.7 18 295 64 16 95 MIN 1.5 1.5 .88 .71 .93 1.2 .97 .82 1.7 CFSM .81 2.75 .34 .24 .61 4.01 1.21 .60 4.20 /N. AC-FT .93 186 2.96 591 .39 .26 .70 4.47 77 52 140 892 1.40 279 .70 139 4.70 937 WATER QUALITY RECDROS PERIOD OF RECORD.--FEBRUARY TO SEPTEMBER 1984 WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOW, SPECI.IC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS OUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) FEB. 09 1125 1.4 463 23.0 JUN, 14 1011 18 24 28.0 MAR, 08 1000 1.4 412 23.5 AUG, 15 1320 0.9 243 30.5 MAY, 17 113C 1.2 414 29.0 135 \ RIO GRANDE DE LOIZA BASIN 50051310 RIO CAYAGUAS AT CERRO GORDO, PR LOCATION.--Lat 18°09'13", long 65°57'20", Hydrologic Unit 21010005, at downstream side on bridge on Highway 912, at Barrio Cerro Gordo, 2.8 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. Altitude of gage is 490 ft (150 m), from topographic map. Prior to Oct. 1, 1983, at site 2,000 ft (610 m) downstream at different datum. REMARKS. - -Records fair. AVERAGE DISCHARGE.--7 years (1978-84), 47.9 cu ft/s (1.356 cu m/s), 63.77 in/yr (1,620 mm/yr), 34,700 acre-ft/yr (42.8 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,200 cu ft/s (374 cu m/s), Aug. 31, 1979, gage height 9.44 ft (2.877 m) site and datum then in use, from rating curve extended above, 1,000 cu ft/s (28.3 cu m/s) 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 above base 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 m/s) (ft) (m) Nov. 5 1915 2,940 83.3 13.83 4.215 June 10 0800 3,030 85.8 13.97 4.258 Feb. 15 2045 *4,530 128 15.98 4.871 Minimum daily discharge, 11 cu ft/s (0.312 cu m/s) Apr. 30, May 1-5, 7-9, 11,12, 15-20. DISCHARGES IN CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 53 188 29 35 27 22 16 11 51 35 32 19 2 33 54 306 26 26 22 15 11 26 34 43 18 3 29 29 52 24 29 22 15 11 21 27 28 18 4 27 440 39 23 32 21 15 11 27 126 105 27 5 27 478 36 22 29 21 15 11 20 167 33 46 6 27 194 39 22 31 22 15 12 44 38 23 43 7 29 74 34 22 30 21 15 11 195 29 24 21 8 29 52 28 21 27 22 14 11 74 26 23 21 9 41 42 25 24 27 26 14 11 42 25 22 18 10 31 37 26 38 30 24 13 13 542 24 20 22 11 27 35 26 22 29 22 13 11 99 24 21 47 12 27 33 24 24 100 23 13 11 62 24 21 39 13 31 32 23 130 129 25 13 12 72 24 21 64 14 31 32 23 85 48 37 13 12 47 26 25 155 15 31 33 26 40 567 29 13 11 34 26 22 41 16 33 32 33 35 464 31 13 11 66 24 25 29 17 25 30 31 33 52 36 14 11 48 23 19 118 18 23 30 31 33 32 30 13 11 37 23 19 89 19 37 30 29 31 25 25 13 11 37 24 21 70 20 22 30 32 49 23 23 12 11 33 25 18 332 21 22 30 25 33 23 21 13 12 32 27 19 94 22 25 29 23 37 22 20 13 12 30 30 16 46 23 21 29 23 32 22 22 13 17 29 31 17 37 24 20 29 22 31 22 19 12 13 28 26 14 33 25 20 28 22 38 22 18 12 26 26 24 14 31 26 24 28 22 34 22 17 12 30 27 24 17 31 27 20 29 23 32 23 17 13 19 27 24 51 30 28 19 28 29 33 23 17 17 27 27 23 22 36 29 25 28 25 29 22 18 13 27 28 27 18 32 30 31 27 40 28 --- 17 11 132 34 34 20 40 31 21 --- 75 27 16 --- 39 --- 25 18 --- TOTAL 861 2190 1221 1093 1958 706 406 579 1865 1069 791 1647 MEAN 27.8 73.0 39.4 35.3 67.5 22.8 13.5 18.7 62.2 34.5 25.5 54.9 MAX 53 478 306 130 567 37 17 132 542 167 105 332 MIN 19 27 22 21 22 16 11 11 20 23 14 18 CFSM 2.73 7.16 3.86 3.46 6.62 2.24 1.32 1.83 6.10 3.38 2.50 5.38 IN. 3.14 7.99 4.45 3.99 7.14 2.57 1.48 2.11 6.80 3.90 2.88 6.01 AC-FT 1710 4340 2420 2170 3880 1400 805 1150 3700 2120 1570 3270 CAL YR 1983 TOTAL 14951.4 MEAN 41.0 MAX 806 MIN 8.2 CFSM 4.02 IN 54.52 AC-FT 29660 NTR YR 1984 TOTAL 14386.0 MEAN 39.3 MAX 567 MIN 11 CFSM 3.85 IN 52.46 AC-FT 28530 136 RIO GRANDE DE LOIZA BASIN 50051310 RIO CAYAGUAS AT CERRO GORDO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1911 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1934 DATE TIME STREA0FLO4, INSTANTANEOUS (CFS) SPECIFI: CC'- DUCTANCE (UmHOS) TEMPERA- TUBE (DEG C) DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UM1OS) TEMPERA- TURF (DEG C) OCT, NOV, DEC, JAN, =F.°, MAR, 12 07 14 1R 16 09 1236 1244 1030 0937 1343 1320 27 73 24 32 130 28 125 104 140 219 61 128 27.0 25.5 22.0 22.0 21.5 26.0 MAR, APR, MAY, JUN, AUG, 23 1400 11 1610 21 1246 13 1173 16 1310 17 14 12 93 26 132 135 143 93 123 29.0 29.0 30.0 28.5 29.5 137 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 (20.4 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--December 1983 to September 1984. GAGE.--Water-stage recorder. Altitude of gage is 430 ft (130 m) , from topographic map. REMARKS.--Records fair. EXTREMES FOR CURRENT PERIOD.--Peak discharges above base 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) Feb. 15 2145 *2,650 75.0 9.75 2.972 July 5 0130 1,740 49.3 8.52 2.597 June 10 0600 2,180 61.7 9.14 2.786 Minimum discharge, 5.9 cu ft/s (0.167 cu m/s) Apr. 28,29. DISCHARGE, IN CUBIC FEET PER SECOMD, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 10 11 7.4 13 11 7.3 31 19 6.4 10 2 140 9.1 7.1 13 11 8.1 26 17 16 10 3 30 3.5 7.6 12 12 8.5 20 12 10 19 4 15 3.5 9.8 12 13 7.7 16 110 28 15 5 13 8.4 7.4 13 15 7.4 14 396 19 69 6 18 9.6 7.0 13 14 7.3 25 41 17 31 7 14 8.8 7.4 13 11 7.0 53 29 16 15 8 12 8.8 6.6 13 9.9 7.0 43 26 16 11 9 11 9.2 18 13 9.7 8.6 29 25 15 13 10 11 9.3 27 13 9.3 9.8 430 24 14 11 11 12 9.1 20 12 9.7 8.7 50 23 14 11 12 10 11 116 12 8.4 9.3 33 22 10 14 13 9.5 89 184 12 8.2 18 44 20 11 14 14 9.0 36 50 14 9.1 9.9 28 22 9.9 25 15 9.0 23 325 12 9.0 9.4 21 20 11 19 16 9.5 19 208 12 8.6 8.8 96 18 11 23 17 9.5 25 33 13 8.8 8.9 29 17 9.1 96 18 10 29 23 12 8.0 7.2 19 18 8.2 87 19 9.0 22 19 12 7.7 7.0 26 16 8.2 74 20 8.5 48 17 12 8.2 8.0 17 18 8.9 128 21 8.2 28 16 12 9.0 8.8 15 23 8.9 49 22 8.6 24 16 13 9.6 10 14 22 7.4 25 23 8.4 15 15 16 12 22 13 24 7.4 19 24 8.1 9.2 14 15 11 20 11 17 6.9 17 25 7.8 24 14 13 11 26 11 17 6.8 16 26 7.8 11 14 16 7.7 52 11 15 27 15 27 7.8 8.4 14 18 14 38 10 12 20 15 28 7.9 12 14 17 7.3 36 10 10 11 14 29 9.2 8.1 14 17 6.3 37 11 16 8.1 14 30 16 7.9 --- 16 6.6 101 13 16 10 15 31 16 7.6 12 37 8.0 10 TOTAL 475.8 557.5 1231.3 416 296.1 561.7 1169 1073.0 382.2 894 MEAN 15.3 18.0 42.5 13.4 9.87 18.1 39.0 34.6 12.3 29.8 MAX 140 89 325 18 15 101 430 396 28 128 MIN 7.8 7.6 6.6 12 6.3 7.0 10 8.0 6.4 10 CFSM 1.94 2.28 5.39 1.70 1.25 2.29 4.94 4.39 1.56 3.78 IN. 2.24 2.63 5.80 1.96 1.40 2.65 5.51 5.06 1.80 4.21 AC-FT 944 1110 2440 825 587 1110 2320 2130 758 1770 138 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR LOCATION .--Lat 18°14'33", long 66°00'34", Hydrologic Unit 21010005, on right bank 250 ft (76 m) 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 sq 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.--Datum of gage is 143.28 ft (43.672 m) above mean sea level (datum of 1941). REMARKS.--Records fair. AVERAGE DISCHARGES.--24 years (1961-84), 218 cu ft/s (6.174 cu m/s), 32.97 in/yr (837 mm/yr), 157,900 acre-ft/yr (195 cu hm/yr); median of yearly mean discharges, 208 cu ft/s (5.89 cu m/s), 151,000 acre-ft/yr (186 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 71,500 cu ft/s (2,025 cu m/s) Sept. 6, 1960, gage height, 31.17 ft (9.501 m), from rating curve extended above 6,000 cu ft/s (170 cu m/s) on basis of slope-area measurement; minimum daily discharge, 10 cu ft/s (0.283 cu m/s) Apr. 5, 10, 29, 1968. EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Nov. 5 unknown *29,100 824 21.72 6.620 June 10 0845 24,300 688 20.26 6.175 Feb. 15 2215 14,500 411 16.77 5.111 Sept. 20 0900 8,080 229 13.79 4.203 Minimum discharge, 26 cu ft/s (0.736 cu m/s) May 17-19,22. DISCHARGE• IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 340 187 100 124 66 89 48 34 158 120 94 90 2 131 193 1330 83 67 85 44 33 124 142 247 93 3 277 110 219 73 67 82 46 33 85 90 100 84 4 165 2390 139 75 85 82 44 34 97 380 277 148 5 122 6500 122 74 82 77 47 34 72 1900 172 408 6 110 1700 165 70 81 81 50 33 262 276 100 283 7 110 400 127 70 77 76 51 36 668 171 87 113 8 109 286 114 71 72 74 46 35 343 138 77 87 9 150 225 105 72 109 78 43 35 198 132 74 93 10 122 194 103 93 137 81 44 44 4100 121 72 131 11 104 175 108 74 125 70 46 42 443 110 68 178 12 108 160 98 67 293 66 45 36 239 102 65 176 13 115 150 90 354 951 67 41 67 445 92 62 319 14 137 141 86 340 307 86 38 71 255 116 61 957 15 117 136 87 143 1830 72 38 50 173 131 61 253 16 150 140 91 107 2300 70 35 39 270 92 73 322 17 110 131 91 131 324 70 35 32 264 83 65 781 18 103 124 94 122 211 75 35 30 153 79 58 983 19 151 122 86 115 166 63 34 31 150 76 56 716 20 99 116 82 207 142 58 34 30 131 79 61 1720 21 113 110 32 135 129 56 38 30 116 86 66 673 22 137 107 80 109 119 59 42 30 105 102 57 326 23 94 103 88 98 110 71 35 63 95 104 55 243 24 84 102 79 86 104 63 34 55 90 85 53 197 25 81 102 75 107 100 55 31 80 87 77 50 173 26 87 100 75 87 98 53 40 202 86 73 128 157 27 79 97 80 87 97 52 80 136 81 82 300 146 28 74 96 82 83 94 49 104 139 77 71 111 152 29 86 93 82 77 91 48 46 102 95 89 76 135 30 136 103 100 71 --- 48 37 713 103 172 436 177 31 121 --- 114 68 47 --- 245 --- 93 149 --- TOTAL 3972 14593 4374 3473 3434 2103 1331 2574 9565 5464 3411 10314 MEAN 128 486 141 112 291 67.8 44.4 83.0 319 176 110 344 MAX 340 6500 1330 354 2300 89 104 713 4100 1900 436 1720 MIN 74 93 75 67 66 47 31 30 72 71 50 84 CFSM 1.43 5.41 1.57 1.25 3.24 .76 .49 .92 3.55 1.96 1.23 3.83 IN. 1.65 6.05 1.81 1.44 3.49 .87 .55 1.07 3.96 2.26 1.41 4.27 AC-FT 7880 28950 8680 6890 16730 4170 2640 5110 18970 10840 6770 20460 CAL YR 1983 TOTAL 82258 MEAN 225 MAX 6500 MIN 35 CFSM 2.51 IN 34.08 AC-FT 163200 WTR YR 1984 TOTAL 69608 MEAN 190 MAX 6500 MIN 30 CFSM 2.12 IN 28.84 AC-FT 138100 139 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1959 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI". STREP'' SPE'. DIS- DEMAND, FORM. TOCOCCI STREAM- CIFIC SOLVED CHEM-. FECAL, FECAL, FLOW, CON- PH TJR- OXYGEN, (PER". ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND". TEMPER-. RID- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANC! ARD ATURE ITY SOLVED SATUR.... LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) AT ION) (MG/L) 100 ML) 100 ML) OCT , 1933 04... 1300 156 209 7.4 27.0 60 7.6 96 13 20000 6000 DEC 13... 1105 91 243 7.4 24.5 3.9 R.6 104 <10 41000 590 MAR , 1934 13... 1210 64 245 7.9 26.0 7.5 3.0 99 12 600 K50 APR 24... 1050 40 253 7.4 27.5 13 7.9 100 <10 K1300 120 JUN 25... 1220 19 226 7.6 30.0 7.9 7.4 98 <10 K2000 40 AUG 14... 1315 61 239 7.6 31.5 2.5 8.7 117 <10 260 230 HARD- MAGNE.. SODIUM POTAS- ALKA... 'CMLO- FLUO- HARD- NESS, CALCIUM SLUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR... DIS- DIS- DIS- SORP- DIS- FIELD DIS- HS." DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED DATE AS CAC03) (MG/L CAC03) (MG/L AS CA) (MG/L AS MG) (MG/L AS NA) RATIO (MG/L AS K) AS CAC03) (MG/L AS SO4) (MG/L AS CL) (MG/L AS F) OCT , 1983 04... 61 0 15 5.3 17 1 2.3 65 12 15 .20 DEC 13... 74 MAR , 1984 13... 77 APR 24... 70 0 18 6.1 23 1 2.0 75 19 22 .20 JUN 25... 73 AUG 14... 67 0 17 6.0 22 1 2.0 71 20 21 .20 SOLIDS, SOLIDS, NITRO'". SILICA, SUM OF DIS.... CONSTI... SOLIDS, DIS.... RESIDUE AT 105 NITRO- GEN, NITRO- GEN, NITRO. . GEN, NITRO- GEN, NITRO- GEN,A*". GEN, MONIA + NITRO'". DATE SOLVED TUENTS, (MG/L DIS- AS SOLVED 5IO2) (MG/L) SOLVED DEG. Cr (TONS SUS- PER PENDED DAY) (MG/L) NITRATE NITRITE TOTAL TOTAL (MG/L (MS/L AS N) AS N) NO2+NO3 AMMONIA ORGANIC ORGANIC TOTAL TOTAL TOTAL TOTAL (MG/L (MG/L (MG/L (MG/L AS N) AS N) AS N) AS N) GEN, TOTAL (MG/L AS N) OCT , 1933 04... 32 140 58 98 .58 .02 .60 .11 1.3 1.4 2.0 DEC 13... ...... 25 .72 .08 .80 .15 .05 .20 1.0 MAR , 1984 13... 9 .52 .08 .60 .28 .42 .70 1.3 APR 24... 32 170 18 21 .52 .08 .60 .32 1.2 1.5 2.1 JUN 25... 14 .31 .09 .40 .06 .04 .10 .50 AUG 14... 31 160 27 11 .45 .05 .50 .14 .56 .70 1.2 K = non-ideal count 140 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- BARIUM, CADMIUM M/UM, LEAD, MERCURY SILVER, NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERABLE ERABLE ERA3LE ERABLE ERABLE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS 3A) AS CD) AS CR) AS PS) AS HG) AS SE) AS AG) OCT , 1983 04... 8.9 .22 4 100 4 4 7 <.1 <1 <1 DEC 13... 4.4 .16 -- MAR , 1984 13... 5.8 .24 -- APR 24... 9.3 .38 1 <100 1 3 4 .2 <1 <1 JUN 25... 2.2 .04 AUG 14... 5.3 .22 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, 13 1333 86 279 28.0 APR, 24 1021 40 244 28.0 MAR, 08 1247 73 235 26.0 MAY, 18 0935 34 293 29.0 APR, 13 1540 54 259 30.5 JUL, 26 1304 70 223 29.5 141 RIO GRANDE DE LOIZA BASIN 50055250 RIO CAGUITAS AT HIGHWAY 30 AT CAGUAS, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°15'11", long 66°01'26", at Highway 30 bridge, and 0.8 mi (1.3 km) east of Caguas plaza. DRAINAGE AREA.--14.1 sq mi (36.5 sq km). PERIOD OF RECORD.--Water years 1972 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI- STREP- SPE- ors- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- P4 TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- OIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARO ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1983 13... 1450 9.0 528 7.6 30.0 3.4 7.0 93 14 K200000 K9100 DEC 13... 1345 12 725 7.6 27.5 16 .6 3 80 2300000 220000 MAR , 1984 12... 1255 8.3 720 7.7 27.5 9.3 7.8 99 97 K740000 220000 APR 25... 1440 3.5 718 7.6 27.5 2.5 6.6 87 15 310000 K11000 JUN 26... 1425 5.8 654 7.6 32.0 2.1 15.2 209 22 250000 5300 AUG 23... 1245 6.7 651 7.6 30.5 1.7 6.8 91 22 230000 K8000 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DU- DIS- 01S- SORP- On- FIELD ors- ors- OIS- (MG/L BORATE SOLVED SOLVED SOLVED TIDN SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT , 1983 13... 190 56 51 15 33 1 3.0 133 63 37 .20 DEC 13... - 194 MAR , 1984 12... 175 APR 25... 230 78 71 14 47 1 3.4 157 140 54 .40 JUN ..• .0. 26... 153 AUG 23... 210 52 60 14 44 1 4.4 156 100 50 .40 SOLIDS, SOLIDS. NITRO- SILICA, SUM OF SOLIDS. RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- DIS- AT 105 GEN. GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS. SOLVED DEG. Co NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDEO (MG/L (MG/L (MUL (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT r 1983 13... 36 320 7.7 3 .54 .06 .60 .29 .31 .60 1.2 DEC II 0 .M. alb 010 3... 1 -- 34 2.0 .48 2.5 7.8 4.2 12 15 MAR • 1984 -.. •I10 alb 12... -- 18 2.2 .14 2.3 4.0 4.0 8.0 10 APR 25... 33 460 .65 6 .10 .10 .20 2.6 2.4 5.0 5.2 JUN 26... -- -- -- 6 .92 .18 1.1 1.9 2.0 3.9 5.0 AUG 23... 32 400 7.2 4 .14 .06 .20 3.30 .90 4.2 4.4 A a non-idoal count 142 RIO GRANDE DE LOIZA BASIN 50055250 RIO CAGUITAS AT HIGHWAY 30 AT CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER. 1983 TO SEPTEMBER 1984 GATE NITRO- GEN, TOTAL (MG/L AS M03) PM0S­ PHORUS, TOTAL (MG/L AS ') ARSENIC TOTAL (UG/L AS AS) 3ARIUM, TOTAL RECOV­ ERA3LE (UG/L AS 3A) CADMIUM TOTAL RECOV­ ERAPLE (UG/L AS CO) CIRO- MIUm, TOTAL RECOV­ ERA3LE (UG/L AS :R) LEAD, TOTAL RECOV­ ERAELE (UG/L AS P3) MERCURY TOTAL RECOV­ ERA3LE (UG/L AS MG) SELE- NIOM• TOTAL (UG/L AS SE) SILVER, TOTAL RECOV- ERA3LE (UG/L AS AG) OCT • 1483 13... 5.3 DEC 13... 64 MAR , 1434 12... 46 APR 25... 23 JUN 26... 22 AUG 23... 14 .49 .35 1.2 .?1 .49 .44 1 <100 103 <1 1 7 3 2 2 <.1 <.1 <1 <1 <1 <1 143 RIO GRANDE DE LOIZA BASIN 50055400 RIO BAIROA NEAR CAGUAS, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°15'28", long 66°02'13", at bridge on Highway 1, about 2.5 mi (4.0 km) upstream from Rio Grande de Loiza, and 1.4 mi (2.3 km) north of Caguas plaza. DRAINAGE AREA.--5.4 sq mi (14.0 sq km). PERIOD OF RECORD.--Water years 1958, 1962-66, 1973-74, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- P4 TOR- OXYGEN, (PER- ICAL 0.7 AF AGAR INSTAN- DUCT- (STAND- TEMPER- 310- DIS- CENT (HIGH UM-ME (COLS. TIME TANEOUS ANCE A'0 ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT . 1933 14... 10)0 2.3 447 7.6 25.3 2.4 5.2 63 27 54000 5700 DEC 16... 1255 3.3 433 7.6 25.D 4.1 7.0 35 10 K190000 9700 MAR , 1934 12... 1110 3.3 603 7.7 25.i 11 5.7 64 130 K2200000 460000 APR 26... 1020 1.2 466 7.4 26.0 1.5 3.3 41 17 24000 7200 JUN 25... 1530 2.0 479 7.4 31.3 5.2 6.6 116 13 24000 2300 AUG 22... 1305 2.5 436 7.6 2F.0 1.5 5.0 64 57 K123030 7400 HARD- mAGNE- SCJIUM POTAS- ALKA.- CHLO - FLUO- HARD- NESS, CALCIUM S!UM, SODIUM, AD- SLUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- CIS- DIS- SORP- DIS- FIELD CIS- DIS." ors- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/1 (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS () CAC03) AS SO4) AS CL) AS OCT , 1983 14... 153 15 35 15 28 1 4.5 134 17 46 .30 DEC 16... 143 MAR , 1934 12... 179 APR 26... 160 2 37 17 30 1 5.5 161 1 7 47 .30 JUN 25... 153 AUG 22... 153 10 35 15 33 1 7.1 139 25 45 .30 SOLIDS, SOLIDS, NITRO'. SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- °IS". CONSTI- OIS- AT 105 GEN, GEN, GEN, GEN, GEN. MONIA + NITRO- SOLVED TUENTS, SOLVE) DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED OWL (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE S102) CMG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 14... 33 260 1.6 4 2.0 .05 2.0 .25 .35 .60 2.6 DEC 16... 8 2.5 .08 2.6 .38 .72 1.1 3.7 MAR , 1984 12... 19 .94 .06 1.0 7.0 1.5 3.5 9.5 APR 26... 33 280 .92 2 .95 .05 1.0 .16 .92 1.1 2.1 JUN 25... 13 1.8 .07 1.9 .14 .36 .50 2.4 AUG 22... 31 270 1.9 10 2.4 .09 2.5 .57 .73 1.3 3.8 K = non-ideal count RIO GRANDE DE LOIZA BASIN 50055400 RIO BAIROA NEAR CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER', NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERA3LE ERASLE ERASLE ERASLE ERA3LE TOTAL ERASLE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS RA) AS CD) AS CR) AS PS) AS HG) AS SE) AS AG) OCT , 1933 14... 12 .78 3 190 <1 4 3 <A <1 <1 DEC 16... 16 .83 MAR , 1984 12... 42 4.4 APR 26... 9.3 .90 4 100 1 1 2 .4 <1 <1 JUN 25... 11 .13 - AUG 22... 17 1.3 144 145 RIO GRANDE DE LOIZA BASIN 50055650 QUEBRADA CAIMITO NEAR JUNCOS, PR LOCATION.--Lat 18°14'08", long 65°52'12", Hydrologic Unit 21010005, at upstream side of bridge on Highway 31, 0.5 mi (0.8 km) upstream from Rio Gurabo, and 3.5 mi (5.6 km) east of Juncos. DRAINAGE AREA.--0.82 sq mi (2.12 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January to September, 1984. GAGE.--Water-stage recorder. Altitude of gage is 310 ft (95 m), from topographic map. REMARKS.--Records poor. EXTREMES FOR CURRENT PERIOD.--Peak discharges above base of 150 cu ft/s (4.25 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Sept. 20 0730 *228 6.457 9.79 2.984 No flow many days. DISCHAR3E, IN CUBIC FEET 'ER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .00 .00 .00 .00 .09 .17 .44 .00 2 .00 .00 .00 .00 .07 .07 1.3 .00 3 .00 .00 .00 .00 .03 .00 .49 .00 4 .00 .00 .30 .00 .00 .95 .27 .00 5 .00 .00 .00 .00 .00 1.9 .16 .13 6 .00 .00 .00 .00 .00 .94 .01 .15 7 .17 .00 .00 .00 .32 .49 .00 .00 8 .03 .00 .00 .00 .36 .23 .00 .00 9 .30 .00 .00 .00 .19 .11 .00 .00 10 .33 .00 .00 .00 .65 .01 .00 .00 11 .32 .00 .00 .00 .49 .00 .00 .00 12 .35 .00 .00 .00 .28 .00 .00 .34 13 1.5 .00 .00 .00 .17 .00 .00 1.6 14 .59 .00 .00 .00 .11 .00 .00 1.4 15 2.2 .00 .00 .00 .00 .00 .00 .77 16 3.3 .00 .00 .00 .00 .00 .00 5.8 - 17 .77 .00 .00 .00 .00 .00 .00 4.6 13 .44 .00 .00 .00 .00 .00 .00 3.5 19 .29 .00 .00 .00 .00 .00 .00 2.6 20 .18 .00 .00 .00 .00 .00 .00 17 21 .10 .00 .00 .00 .00 .00 .00 7.0 22 .01 .00 .00 .00 .00 .00 .00 2.8 23 .00 .00 .00 .00 .00 .00 .00 1.4 24 .00 .00 .D0 .00 .00 .00 .00 .94 25 .00 .00 .00 .00 .00 .00 .00 .00 .72 26 .00 .00 .00 .00 .00 .00 .00 7.4 .58 27 .00 .00 .00 .01 .00 .00 .00 2.4 .47 23 .00 .00 .00 .09 .41 .00 .00 .52 .46 29 .00 .00 .00 .00 .05 1.2 1.4 .27 .41 30 .00 .00 .00 .16 .56 .56 .13 .43 31 .00 .00 --- 1.2 --- .15 .09 --- TOTAL 10.88 .00 .10 1.82 4.52 6.97 13.48 53.10 MEAN .38 .000 .003 .059 .15 .22 .43 1.77 MAX 3.3 .00 .09 1.2 1.2 1.9 7.4 17 MIN .00 .00 .00 .00 .00 .00 .00 .00 CFSM .46 .000 .004 .07 .18 .27 .52 2.16 IN. .49 .00 .00 .08 .20 .32 .61 2.41 AC-FT 22 .00 .2 3.6 9.0 14 27 105 WATER ,DUALITY RECORDS PERIOD OF RECORD.--JUNE TO SEPTEMBER 1984 WATER-DUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON­ TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CgS) (UMMOS) (DEG C) (CFS) (UMMOS) (DEG C) JUN., 13 1613 .02 355 29.5 146 RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, PR LOCATION.--Lat 18°12'58", long 66°55'34", Hydrologic Unit 21010005, on left bank at Highway 919, 0.5 mi (0.8 km) upstream from Quebrada Don Victor, 1.7 mi (2.7 km) upstream from Rio Gurabo and 1.0 mi (1.6 km) south of Juncos. DRAINAGE AREA.--16.4 sq mi (42.5 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1971 to current year. GAGE.--Water-stage recorder. Altitude of gage is 320 ft (98 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--13 years (1972-84), 49.4 cu ft/s (1.399 cu m/s), 40.90 in/yr (1,039 mm/yr), 35,790 acre-ft/yr (44.1 cu hm/yr); median of yearly mean discharges, 50 cu ft/s (1.42 cu m/s), 36,200 acre-ft/yr (45 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 23,300 cu ft/s (660 cu m/s) Aug. 31, 1979, gage height, 20.17 ft (6.148 m), from rating curve extended above 100 cu ft/s (2.83 cu m/s) on basis of slope-area measurement and step-backwater analysis; minimum, 2.0 cu ft/s (0.057 cu m/s) May 11, 1984, gage height, 0.13 ft (0.040 m). EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate discharges (no stages were recorded) of major floods are as follows: Sept. 6, 1960, 37,100 cu ft/s (1,050 cu m/s); Oct. 9, 1970, 18,200 cu ft/s (515 cu m/s). EXTREMES FOR CURRENT YEAR.--Peak discharges above base of 3,400 cu ft/s (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 m/s) (ft) (m) Nov. 5 1715 3,890 110 8.13 2.478 June 10 0800 *5,710 162 9.85 3.002 Minimum discharge, 2.0 cu ft/s (0.057 cu m/s) May 11. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 27 24 17 17 12 14 8.5 5.8 35 19 20 14 2 21 13 196 15 12 13 8.5 5.7 26 30 72 16 3 24 20 32 14 12 12 8.5 5.7 18 17 23 21 4 20 724 23 14 14 11 8.5 7.1 46 13 41 25 5 19 775 22 14 12 12 8.5 5.8 21 63 25 55 6 18 469 29 13 13 12 8.5 5.3 128 24 19 70 7 19 61 22 13 14 12 9.0 5.6 209 19 17 28 8 20 41 22 13 13 12 8.2 5.8 83 17 15 18 9 40 33 20 14 13 12 7.1 6.2 43 15 16 16 10 20 28 20 16 17 12 7.2 6.3 983 27 15 18 11 17 25 20 14' 22 11 7.8 4.2 170 21 14 28 12 26 24 19 13 18 11 7.1 5.0 66 15 14 40 13 20 23 18 27 134 11 7.3 19 241 14 13 334 14 17 22 17 30 35 11 6.6 11 87 24 13 686 15 19 21 18 17 205 11 6.4 7.4 48 25 13 80 15 21 22 18 16 603 11 6.1 7.2 37 15 13 195 17 17 21 18 15 41 11 6.8 6.6 33 14 13 333 18 32 20 18 15 26 11 6.5 6.0 30 13 13 323 19 39 19 17 14 21 10 6.6 5.5 43 12 12 138 20 19 19 16 51 19 10 9.1 5.7 34 14 12 414 21 17 18 16 20 17 10 7.4 6.6 26 23 12 151 22 16 17 18 17 16 10 8.7 6.4 23 21 13 81 23 15 18 18 14 15 10 6.9 15 20 22 12 65 24 14 17 16 13 15 10 6.6 9.0 19 15 12 55 25 14 17 15 13 14 10 6.2 17 19 13 12 55 26 44 16 16 14 14 10 6.0 55 18 12 230 47 27 17 16 19 14 15 9.5 12 16 17 14 300 53 28 15 15 16 14 15 9.0 14 39 17 14 60 50 29 20 16 17 13 13 9.0 6.6 21 32 54 40 43 30 23 17 20 13 --- 8.5 6.3 296 20 60 60 51 31 27 --- 19 12 3.5 --- 75 --- 22 20 --- TOTAL 677 2576 772 517 1390 334.5 233.5 692.9 2592 691 1164 3503 MEAN 21.8 85.9 24.9 16.7 47.9 10.8 7.78 22.4 86.4 22.3 37.5 117 MAX 44 775 196 51 603 14 14 296 983 68 300 686 MIN 14 15 15 12 12 3.5 6.0 4.2 17 12 12 14 CFSM 1.33 5.24 1.52 1.02 2.92 .66 .47 1.37 5.27 1.36 2.29 7.13 IN. 1.54 5.84 1.75 1.17 3.15 .76 .53 1.57 5.88 1.57 2.64 7.95 AC-FT 1340 5110 1530 1030 2760 663 463 1370 5140 1370 2310 6950 CAL YR 1983 TOTAL 18067.9 MEAN 49.5 MAX 1860 MIN 6.4 CFSM 3.02 IN 40.98 AC-FT 35840 WTR YR 1984 TOTAL 15142.9 MEAN 41.4 MAX 983 MIN 4.2 CFSM 2.52 IN 34.35 AC-FT 30040 147 RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, PR--Continued WATER QUALITY RECORDS PERIOD OF REC(rD.--WATER YEARS AUGUST 1931 TO CURRENT YEAR WATER- Q UALITY OATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFL04, SPECIFIC CON­ TEMPERA­ STREAMPLOW. SPECIFIC CON­ TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURF DATE TIME INSTANTANEOUS DUCTANCE TURE (CgS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 11 1524 17 233 27.5 MAR, 07 1239 12 265 24.5 DEC, 13 1200 13 242 23.0 JUN. 13 1125 34 235 26.0 JAN, 12 0956 13 272 22.0 JUL, 26 1607 13 245 29.0 FEB, 17 1051 41 209 22.5 AUG. 13 1040 13 252 27.0 148 RIO GRANDE DE LOIZA BASIN 50056900 QUEBRADA MAMEY NEAR GURABO, PR LOCATION.--Lat 18°14'57", long 65°56'44", Hydrologic Unit 21010005, at left downstream side of bridge on Highway 189, 1.9 mi (3.0 km) southeast of Gurabo plaza, and 2.10 mi (3.4 km) northwest of Juncos plaza. DRAINAGE AREA.--2.30 sq mi (5.96 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--December 1983 to September 1984. GAGE.--Water-stage recorder. Altitude of gage is 180 ft (55 m), from topographic map. REMARKS.--Records fair. EXTREMES FOR CURRENT PERIOD.--Peak discharges above base of 400 cu ft/s (11.3 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) June 10 0700 *1,050 29.7 8.11 2.472 Sept. 16 2000 466 13.2 6.64 2.024 Aug. 30 1600 525 14.9 6.83 2.082 Minimum discharge, 0.24 cu ft/s (0.007 cu m/s) Aug. 30. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .56 .44 .53 .54 .53 .95 .48 .60 1.3 2 .52 .45 .52 .55 .53 .73 .45 1.7 .80 3 4 .51 .51 .44 .47 .49 .49 .56 .57 .53 .51 .52 .52 .46 .47 .64 .58 9.8 2.6 5 .51 .44 .54 .57 .50 .54 2.2 .59 14 6 .50 .50 .54 .62 .49 2.9 .70 .50 3.6 7 .43 .56 .51 .66 .48 4.3 .47 .48 1.0 8 .58 .52 .51 .62 .47 2.1 .44 .47 .73 9 .60 5.8 .54 .64 .47 .84 .75 .46 .78 10 .63 6.9 .49 .66 .45 73 1.3 .42 .81 11 .56 2.3 .49 .67 .43 2.0 .76 .38 .63 12 13 .67 1.1 1.2 9.5 .50 .50 .67 .63 .47 .92 .98 .83 .55 .48 .38 .39 .70 .75 14 .76 1.8 .49 .55 1.0 .69 .70 .38 2.3 15 .55 28 .51 .53 .66 .59 .99 .38 .97 16 .54 44 .56 .49 .59 .55 .54 .54 27 17 .55 1.6 .55 .50 .54 .60 .48 .48 39 18 .52 .97 .51 .51 .52 .56 .48 .39 30 19 20 .75 .91 .81 .73 .53 .51 .52 .48 .51 .50 .56 .58 .47 .63 .42 .45 11 29 21 .54 .65 .49 .46 .51 .56 .56 .43 5.7 22 .50 .63 .49 .47 .48 .56 .59 .44 2.8 23 .51 .62 .55 .47 .55 .52 .51 .41 2.1 24 .50 .58 .53 .46 .48 .50 .47 .38 1.8 25 .51 .57 .50 .44 .49 .49 .43 .38 1.7 26 .50 .56 .51 .48 .52 .47 .42 12 1.5 27 .46 .60 .54 1.1 .58 .46 .45 3.8 1.4 28 --- .45 .59 .52 1.1 .68 .46 .43 .42 1.4 29 .53 .44 .53 .51 .53 .60 .61 3.4 .28 1.3 30 .61 .44 --- .51 .50 5.8 .61 1.3 79 1.3 31 .63 .43 .53 --- 3.7 --- .65 4.1 --- TOTAL 17.59 112.76 15.99 17.60 25.49 99.58 23.01 112.27 197.77 MEAN .57 3.89 .52 .59 .82 3.32 .74 3.62 6.59 MAX 1.1 44 .56 1.1 5.8 73 3.4 79 39 MIN .43 .44 .49 .44 .43 .46 .42 .28 .63 CFSM .25 1.69 .23 .26 .36 1.44 .32 1.57 2.87 IN. .28 1.82 .26 .28 .41 1.61 .37 1.82 3.20 AC-FT 35 224 32 35 51 198 46 223 392 WATER QUALITY RECORDS PERIOD OF RECORD.--MARCH TO SEPTEMBER 1984 WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE TIME STREAMFLOW, INSTANTANEOUS SPECIFIC CON- DUCTANCE TEMPERA- TURE DATE TIME STREAMFLGW, INSTANTANEOUS SPECIFIC CON­ DUCTANCE TEMPERA- TURE (CFS) (UMHOS) (DEG C) (CFS) (UMMOS) (DIG C) MAR. OS 1430 0.5 735 26.0 JUN. 13 1431 0.8 570 31.0 MAY. 21 1420 0.6 705 28.0 AUG, 14 1235 0.4 770 29.0 149 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT GURABO, PR LOCATION.--Lat 18°15'30", long 65°58'05", Hydrologic Unit 21010005, on left bank, at bridge on Highway 181, 0.3 mi (0.5 km) east of Gurabo, and 4.5 mi (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. Datum of gage is 136.58 ft (41.630 m) above mean sea level. REMARKS.--Records fair. AVERAGE DISCHARGE.--25 years (1960-84), 131 cu ft/s (3.710 cu m/s), 29.55 in/yr (750 mm/yr), 94,910 acre-ft/yr (117 cu hm/yr); median of yearly mean discharges, 127 cu ft/s (3.60 cu m/s), 92,000 acre-ft/yr (113 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 74,600 cu ft/s (2,133 cu m/s) Sept. 6, 1960, gage height, 27.7 ft (8.44 m), from floodmark, from rating curve extended above 8,000 cu ft/s (227 cu m/s) on basis of slope-area measurement at gage height 21.6 ft (6.58 m), contracted opening, culvert and flow over road measurement at gage height 23.76 ft (7.242 m), and estimate of peak flow based on slope-area measurements of Rio Gurabo and Rio Valenciano, 7.0 mi (11.3 km) upstream, adjusted for channel storage and flow from intervening area; minimum, 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 m). EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Nov. 4 2045 5,130 145 11.34 3.456 June 10 1000 4,650 132 10.73 3.270 Nov. 5 2145 4,100 116 10.00 3.048 Aug. 26 2330 5,100 144 11.30 3.444 Nov. 6 0800 *6,140 174 12.54 3.822 Sept. 16 2230 3,310 93.7 8.86 2.700 Nov. 28 1800 3,640 103 9.35 2.850 Sept. 20 1145 3,070 86.9 8.50 2.591 Feb. 16 0230 4,910 139 11.06 3.371 Minimum discharge, 8.3 cu ft/s (0.235 cu m/s) May 12. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 83 64 60 48 27 31 16 14 138 87 51 33 2 60 61 100 37 27 32 16 14 111 72 319 31 3 82 52 76 33 28 30 16 13 81 71 94 49 4 58 1960 54 32 29 28 16 12 100 66 78 61 5 52 1520 52 31 28 29 16 11 73 355 77 140 6 49 2700 70 30 28 29 17 11 262 116 52 181 7 50 297 52 29 35 28 18 11 399 77 43 66 8 95 154 61 33 36 28 19 10 254 74 38 41 9 127 118 58 33 61 29 17 9.6 155 72 36 36 10 76 101 53 33 107 28 16 11 1290 ST 34 47 11 54 89 51 32 87 27 15 10 352 70 29 39 12 67 83 48 33 66 25 15 8.6 170 57 26 96 13 58 75 46 52 233 24 14 15 330 48 25 383 14 53 71 46 87 118 25 14 28 168 38 23 972 15 312 68 45 46 231 24 14 15 109 80 22 163 16 129 69 50 33 1610 24 14 14 88 55 30 509 17 95 66 49 47 111 24 12 13 76 45 26 633 18 73 62 46 33 65 25 12 13 69 46 23 669 19 121 59 45 34 50 23 12 12 65 44 22 326 20 92 58 42 109 44 21 13 12 82 46 24 1010 21 142 56 44 51 39 20 14 13 62 43 31 429 22 69 55 45 38 37 20 14 14 54 79 25 186 23 54 53 51 34 35 21 14 17 47 65 25 119 24 47 53 42 34 34 24 13 26 44 51 22 93 25 45 53 39 36 33 20 12 22 44 43 19 80 26 90 50 36 38 32 19 11 80 40 39 622 67 27 52 49 39 31 33 18 21 54 39 40 839 59 28 46 734 38 31 34 17 40 139 39 36 151 59 29 62 178 39 30 32 17 20 64 211 224 98 60 30 112 73 43 29 17 15 448 167 269 149 64 31 302 ....... 50 28 17 --- 362 --- 76 44 --- TOTAL 2807 9081 1570 1235 3330 744 476 1496.2 5119 2564 3097 6701 MEAN 90.5 303 50.6 39.8 115 24.0 15.9 48.3 171 82.7 99.9 223 MAX 312 2700 100 109 1610 32 40 448 1290 355 839 1010 MIN 45 49 36 23 27 17 11 8.6 39 36 19 31 CFSM 1.50 5.03 .84 .66 1.91 .40 .26 .80 2.84 1.37 1.66 3.70 IN. 1.73 5.61 .97 .76 2.06 .46 .29 .92 3.16 1.58 1.91 4.14 AC-FT 5570 18010 3110 2450 6610 1480 944 2970 10150 5090 6140 13290 CAL YR 1983 TOTAL 57421.0 MEAN 157 MAX 8290 MIN 15 CFSM 2.61 IN 35.48 AC-FT 113900 WTR YR 1984 TOTAL 38220.2 MEAN 104 MAX 2700 MIN 8.6 CFSM 1.73 IN 23.62 AC-FT 75810 150 RIO GRANDE DE LOIZA BASIN 50057000 RIO MUM AT GITRABO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEABiR 1984 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS OUCTANCE TORE DATE TIME INSTANTANEOUS DUCTANCE TURE (CRS) (UMNOS) (DEG C) (CPS) (UMMOS) (DEG C) OCT, 12 0905 51 321 27.0 APR, 10 1434 15 406 28.0 NOV, 03 1415 149 315 23.0 APR, 24 1359 13 379 29.0 DEC, 13 1535 46 357 27.0 MAY, 15 1218 13 333 29.0 JAN, 12 1227 28 399 25.5 JUN, 13 0921 67 307 27.0 MAR, 03 1039 27 365 25.0 AUG, 14 1045 22 346 29.0 MAR, 25 1007 17 376 26.5 151 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 1983 TO SEPTEMBER 1984 DATE STREAM- FLOW, INSTAN- TIME TANEOUS (CES) OXYGEN, OXYGEN SPE- DIS- DEMAND, CIFIC SOLVED CHEM- CON- PH TJR- OXYGEN, (PER- ICAL DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH ANCE ARD ATURE III SOLVED SATUR- LEVEL) (UMHOS) UNITS) (DEG C) (NIU) (MG/L) ATION) (MG/L) COLI- STREP- FORM, TOCOCCI FECAL, FECAL, 0.7 KF AGAR UM-MF (COLS. (COLS./ PER 100 ML) 100 ML) OCT , 1983 13... 1150 50 329 7.4 23.5 26 4.2 54 <10 4600 280 DEC 16... 1100 40 386 7.2 26.0 2.3 5.6 69 13 K7900 K2100 MAR , 1934 13... 1600 22 402 7.7 23.0 9.3 5.4 69 18 K12000 5500 APR 24... 1330 13 408 7.4 30.0 4.3 5.3 89 <10 500 220 JUN 26... 1145 32 345 7.4 31.0 3.3 5.4 73 20 K79000 K12000 AUG 23... 0950 23 377 7.2 29.5 .10 3.0 39 15 31000 3200 HARD- MAGNE- SODIUM POTAS- ALKA- CHL0- FLUO- HARD- NESS, CALCIUM SIUM, SODIUM, AO- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- DIS- DIS- SORP- DIS- FIELD DIS- DIS- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MGM. (MG/L (MG/L (4G/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT • 1933 13... 100 DEC 16... MAR • 1934 13... APR 24... 120 JUN 26... AUG 23... 120 0 23 11 24 1 3.3 107 17 26 .20 128 140 0 26 14 33 1 4.9 131 24 38 .20 118 0 26 13 31 1 4.5 123 24 33 .60 DATE SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,A4- DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDEO (MG/L (MG/L (MG/L (MG/L (4G/L (MG/L SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS 4) AS N) AS N) AS N) NITRO- GEN, TOTAL (MG/L AS N) OCT . 1933 13... 30 200 27 2 1.2 .11 1.3 .36 .34 .70 2.0 DEC 16... 11 1.5 .11 1.6 .36 .54 .90 2.5 MAR , 1984 13... -- 14 .91 .09 1.0 1.1 .20 1.3 2.3 APR 24... 36 250 8.9 13 1.3 .12 1.4 .64 4.2 4.8 6.2 JUN 26... -- -- 19 1.1 .06 1.2 .74 1.6 2.3 3.5 AUG 23... 34 240 14 24 1.3 .09 1.4 .91 .99 1.9 3.3 K = non-ideal count 152 RIO GRANDE DE LOIZA BASIN 50057025 RIO GURABO NEAR GURABO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE CHRO- 3ARIUM, CADMIUM MIUM, LEAD, MERCURY NITRO"" PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- ZIL;M: TOTAL TOTAL TOTAL ERA3LE ERABLE ERA3LE ERABLE ERASLE TOTAL (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (US/L (UG/L (UG/L AS NO3) AS P) AS AS) AS 3A) AS CO) AS CR) AS P3) AS HG) AS SE) SILVER. TOTAL RECOV— ERABLE (UG/L AS AG) OCT , 1983 13... 3.9 DEC 16... 11 MAR , 1934 13... 10 APR 24... 27 JUN 26... 15 AUG 23... 15 .52 .45 .96 .72 .67 .81 1 2 100 <10) 1 1 16 <1 2 4 <.1 <.1 <1 <1 <1 <1 153 RIO GRANDE DE LOIZA BASIN 50059000 LAGO LOIZA AT DAMSITE, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°19'49", long 66°01'00", at pumphouse at damsite, and 1.9 mi (3.1 km) south of Trujillo Alto Plaza. DRAINAGE AREA.--208 sq mi (539 sq km). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI ALKA- STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, LINITY FLOW, CON- P4 OXYGEN, (PER- ICAL 0.7 KF AGAR FIELD INSTAN- DUCT- (STAND- TEMPER- DIS- CENT (HIGH UM-MF (COLS. (MG/L TIME TANEOUS ANCE ARO ATURE SOLVED SATJR- LEVEL) (COLS./ PER AS DATE (CFS) (UMHOS) UNITS) (DEG C) (M:/L) ATION) (MG/L) 100 ML) 100 ML) CAC03) OCT , 1933 14... 1210 124 243 7.0 2q.0 2.0 26 48 60 K25 77 DEC 15... 1415 170 223 7.0 26.0 3.6 44 <10 76 K20 66 MAR , 1934 12... 1450 124 lel 7.0 27.3 1.4 13 13 K32 K18 53 APR 26... 1210 170 272 6.8 23.5 1.0 13 19 42 K1300 92 JUL 10... 1310 124 183 6.6 23.0 1.8 23 270 100 55 AUG 21... 1400 1 70 250 6.6 29.0 .4 5 <10 K40 K20 84 SOLIDS, NITRO- RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- PHOS- DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PENOED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) OCT ' 1983 14... <1 .15 .14 .30 .05 .54 .60 .90 4.3 .19 DEC 16... 16 .45 .05 .50 .25 .44 .70 1.2 5.3 .16 MAR , 1984 12... 21 .26 .04 .30 .21 .59 .30 1.1 4.9 .15 APR 26... <1 .02 <.10 .53 .90 1.4 .14 JUL 10... 22 .17 .13 .30 .14 .66 .30 1.1 4.9 .16 AUG 21... 4 <.01 <.10 <.01 1.0 .... .23 K = non-ideal count 154 RIO GRANDE DE LOIZA BASIN 50059100 RIO GRANDE DE LOIZA BELOW TRUJILLO ALTO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°21'35", long 66°00'15", 100 ft (30 m) downstream of Highway 181 bridge, 0.4 mi (0.6 km) northwest of Trujillo Alto plaza, and 2.2 mi (3.5 km) northeast of Lago Loiza Reservoir. DRAINAGE AREA.--213 sq mi (552 sq km). PERIOD OF RECORD.--Water years 1981 to current year. REMARKS: Flow controlled by Lago Loiza reservoir. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE STREAM- FLOW, INSTAN- TIME TANEOUS (CFS) 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- 81)- On- CENT (HIGH UM-MF (COLS. ANCE ARC ATURE ITY SOLVEO SATUR- LEVEL) (COLS./ PER (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) CMG/L) 100 ML) 100 ML) OCT , 1983 24... 1430 10 308 7.6 33.0 5.0 6.4 89 12 K1600 360 DEC 03... 1505 12 326 7.6 27.0 ?.7 3.2 103 <10 550 490 MAR , 1984 15... 1550 5.7 355 1.3 30.0 45 8.3 110 <13 K130 300 MAY 08... 1455 3.8 377 8.0 30.0 2.4 11.6 153 13 K1600 50 JUL 03... 1315 3.8 216 7.4 28.0 11 6.7 85 27 K640 100 AUG 21... 1315 7.7 325 7.8 31.0 5.3 3.0 107 12 2900 K2 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SLUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- 015- DIS- SORP- DIS- FIELD DIS- HS- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS <) CAC03) AS SO4) AS CL) AS F) OCT , 1933 24... 110 1 ?6 10 25 1 2.8 105 19 23 .20 DEC 08... 108 MAR , 1984 15... 126 MAY 08... 130 0 79 13 31 1 3.0 131 22 30 .20 JUL 03... 66 ..- AUG 21... 110 0 26 11 25 1 2.9 115 23 27 .20 SOLIDS. SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO... GEN,AM- DTS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+403 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 24... 26 190 5.3 4 .67 .03 .70 .11 .19 .30 1.0 DEC 08... -- 18 .99 .01 1.0 .30 .00 .30 1.3 MAR , 1984 15... -- -... 67 .37 .03 .40 .15 .55 .70 1.1 MAY 08... 25 230 2.4 9 .17 .03 .20 .07 .73 .80 1.0 JUL 03... -- 12 .18 .02 .20 .10 .60 .70 .90 AUG 21... 25 K = non-ideal 210 count 4.3 4 1.7 .01 1.7 .07 .53 .60 2.3 155 RIO GRANDE DE LOIZA BASIN 50059100 RIO GRANDE DE LOIZA BELOW TRUJILLO ALTO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO— BARIUM. CADMIUM MIUM, LEAD. MERCURY SILVER.. NITRO— PHOS — TOTAL TOTAL TOTAL TOTAL TOTAL SELF — TOTAL GEN. PHORUS, ARSENIC RECOV— RECOV— RECOV— RECOV— RECOV— NIUM, RECOV— TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS BA) AS CO) AS CR) AS P8) AS HG) AS SE) AS AG) OCT r 1983 24... 4.4 .20 1 100 1 7 1 <.1 <1 <1 DEC 08... 5.8 .20 MAR s 1984 15... 4.9 .31 MAY 08... 4.4 .46 2 <100 1 <1 1 <.1 <1 <1 JUL 03... 4.0 .19 AUG 21... 10 .33 156 RIO GRANDE DE LOIZA BASIN 50061800 RIO CANOVANAS NEAR CAMPO RICO, PR LOCATION.--Lat 18°19'08", long 65°53'21", Hydrologic Unit 21010005, at center pier on downstream side of bridge, on paved secondary road, 0.4 mi (0.6 km) northeast of junction of Highways 185 and 186, 1.5 mi (2.4 km) south of Campo Rico, and 4.4 mi (7.1 km) south of Loiza. DRAINAGE AREA.--9.84 sq mi (25.48 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1967 to current year. GAGE.--Water-stage recorder. Altitude of gage is 225 ft (68.6 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--17 years (1968-84), 27.5 cu ft/s (0.779 cu m/s), 37.95 in/yr (964 mm/yr), 19,920 acre-ft/yr (24.6 cu hm/yr); median of yearly mean discharges, 23 cu ft/s (0.65 cu m/s), 16,700 acre-ft/yr (21 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 (3.993 m), from floodmarks, from 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, 0.80 cu ft/s (0.023 cu m/s) July 24, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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 m/s) (ft) (m) Nov. 6 0500 4,820 136 8.33 2.539 Aug. 26 1845 2,510 71.1 6.36 1.938 Dec. 2 0800 *5,260 149 8.66 2.640 Sept 20 0815 2,550 72.2 6.40 1.951 Minimum discharge, 2.8 cu ft/s (0.079 cu m/s) July 28, 29, Aug. 15, 19, 20, 24, 25. DISCHARGE, IN CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 17 21 10 15 8.0 3.9 4.8 3.9 11 7.3 6.5 7.7 2 11 15 395 12 7.8 9.3 4.8 3.8 8.5 5.8 50 7.1 3 10 13 32 12 7.8 8.4 4.7 3.8 5.9 7.0 11 16 4 9.9 271 22 12 8.1 7.9 4.4 3.7 4.5 6.0 8.0 13 5 9.4 78 20 12 7.9 7.9 4.5 3.8 4.2 45 7.5 12 6 9.2 570 59 11 7.5 8.1 4.2 3.9 4.9 12 5.1 21 7 9.0 54 26 11 8.1 7.8 4.7 4.2 17 7.1 4.3 9.7 8 26 35 20 19 8.8 7.9 4.7 3.7 24 5.5 3.8 7.6 9 26 28 19 15 35 8.4 4.3 3.9 11 4.9 3.4 6.8 10 16 25 18 14 47 7.8 4.1 4.9 19 4.5 3.2 8.8 11 11 22 20 13 39 7.2 4.1 4.1 16 4.7 3.2 10 12 9.2 19 19 15 22 7.3 4.6 3.5 10 4.7 3.1 14 13 12 17 17 142 33 7.4 4.3 4.8 8.4 4.6 3.2 13 14 9.7 18 16 35 26 7.1 3.9 8.0 7.2 6.3 3.2 24 15 14 17 16 18 19 6.8 4.0 6.4 5.8 6.9 2.9 13 16 31 15 16 13 61 8.3 3.7 4.5 5.1 4.8 3.2 57 17 28 14 16 12 18 7.4 3.5 3.8 5.5 4.0 3.2 52 18 24 14 17 16 14 7.9 3.6 3.6 5.1 3.9 3.0 38 19 27 16 16 14 12 6.9 3.5 3.4 7.0 3.8 3.0 26 20 14 13 14 15 12 6.6 3.5 3.6 12 3.7 2.8 321 21 19 13 13 12 10 6.2 3.5 3.5 6.7 3.4 3.2 42 22 15 12 15 11 9.9 5.9 3.5 4.2 5.2 3.3 4.1 22 23 10 12 14 12 9.8 6.0 3.5 3.6 4.6 3.2 3.4 15 24 9.5 12 13 12 9.6 5.8 3.6 3.6 4.1 3.5 3.0 13 25 9.0 13 12 14 9.3 5.7 3.3 3.2 4.2 3.4 3.3 12 26 8.8 11 12 13 9.3 5.5 3.4 4.3 3.8 3.9 289 11 27 8.6 11 12 10 9.7 4.8 7.2 8.0 3.8 3.2 76 9.5 28 8.3 11 13 9.9 10 4.8 17 7.2 3.6 3.0 17 9.5 29 11 11 17 8.3 9.0 4.7 6.5 8.3 13 29 11 8.9 30 129 12 15 8.7 --- 5.0 4.3 44 17 30 8.9 9.3 31 96 --- 24 8.4 4.6 --- 44 --- 7.8 8.2 --- TOTAL 647.6 1393 948 545.8 488.6 214.3 139.7 219.2 258.1 246.2 560.7 829.9 MEAN 20.9 46.4 30.6 17.6 16.8 6.91 4.66 7.07 8.60 7.94 18.1 27.7 MAX 129 570 395 142 61 9.3 17 44 24 45 289 321 MIN 8.3 11 10 3.4 7.5 4.6 3.3 3.2 3.6 3.0 2.8 6.8 CFSM 2.12 4.72 3.11 1.79 1.71 .70 .47 .72 .87 .81 1.84 2.82 IN. 2.45 5.27 3.58 2.06 1.85 .81 .53 .83 .98 .93 2.12 3.14 AC-FT 1280 2760 1880 1080 969 425 277 435 512 488 1110 1650 CAL YR 1983 TOTAL 8806.0 MEAN 24.1 MAX 772 MIN 2.8 CFSM 2.45 IN 33.29 AC-FT 17470 WTR YR 1984 TOTAL 6491.1 MEAN 17.7 MAX 570 MIN 2.8 CFSM 1.80 IN 24.54 AC-FT 12880 157 RIO GRANDE DE LOIZA BASIN 50061800 RIO CANOVANAS NEAR CAMPO RICO, PR--Continued WATER 0jALITY RECORDS °ERIOD 0' RECORD.--WATER YEARS AUGUST 19.1 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTO8ER 1983 TO SEPTEM8ER 1934 STREAmFLOW, SPECIFIC CON- TPERck- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS OUCTAACE TURF DATE TIME INSTANTANEOUS DUCTANCE TORE (CFS) (UM.-4C7) (030 C) (C'S) (JMHOS) (DEG C) OCT, .11 1541 1C 1 10 26.3 APR, 11 1537 4.0 260 31.0 NOV, 1 7 1344 14 211 27.0 MAY, 2 -2 1658 3.7 266 29.0 JEC, 15 133) 16 20n 25.0 JUL, 19 1526 3.9 227 32.5 JAN, 1 1 1C35 13 223 24.5 AUK, 06 1o32 5.1 213 30.0 FE), C9 1079 12 280 27.0 SEQ, 12 1432 12 1 70 26.5 MAR, 19 J937 6.8 21.0 159 OCEANO ArLA COoslai basin 063:'9638 ,‘? 0635 0 0635 4449 '- 655 LVOUILLO Rio Grand* de Loin basin Drainage boun Ria #iasazataa twain HUMACAO "' 0777 0787 EXPLANATION A0670 SURFACE-WATER STATION AND NUMBER A 0660 LOW-FLOW STATION AND NUMBER V0725 QUALITY-OF-WATER STATION AND NUMBER Figure 18.--Northeastern river basins--Rio Herrera to Rio Antiin Ruiz basins. 160 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, 0.55 mi (0.88 km) upstream from Rio Espiritu Santo, 0.23 mi (0.42 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. Altitude of gage is 1,230 ft (375 m), from topographic map. REMARKS.--Records poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,410 cu ft/s (39.9 cu m/s) Dec.2, 1983, gage height, 8.60 ft (2.621 m) from rating curve extended above 20 cu ft/s (0.57 cu m/s) on basis of step-backwater analysis; minimum, 0.35 cu ft/s (0.010 cu m/s) Apr. 27, 1984. EXTREMES FOR CURRENT PERIOD.--Peak discharges above base of 500 cu ft/s (14.2 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Dec. 2 0715 *1,410 39.9 8.60 2.621 Minimum discharge, 0.35 cu ft/s (0.010 cu m/s) Apr. 27. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 11 2.9 2.3 6.3 2.0 2.4 1.1 .68 3.9 4.1 12 2.2 2 2.5 2.4 55 4.2 1.7 2.2 .90 .55 2.8 3.0 24 1.6 3 1.6 5.3 3.5 3.7 1.9 1.5 .85 5.7 2.1 6.9 6.0 2.3 4 1.3 44 2.2 3.3 8.6 1.3 .32 8.0 1.6 56 8.8 1.8 5 1.2 10 3.1 3.0 3.8 1.2 .76 1.5 1.7 29 9.7 8.6 6 1.0 46 24 2.3 4.7 1.3 .34 1.7 30 4.5 5.0 4.6 7 2.6 5.2 3.6 2.5 8.7 1.1 .69 3.1 25 3.3 4.3 1.9 8 4.5 3.8 2.4 2.3 2.9 1.2 .58 1.3 4.3 2.7 4.0 1.5 9 7.9 3.3 2.1 5.1 20 4.2 .57 2.7 11 2.4 3.9 1.6 10 3.0 3.0 2.3 7.9 38 1.6 .59 5.1 16 2.4 3.6 2.3 11 1.6 2.8 13 5.3 14 .94 .90 2.2 6.4 4.2 3.4 21 12 1.5 2.6 4.6 14 11 1.6 .67 1.1 6.2 2.8 3.3 9.8 13 5.4 2.5 2.2 31 26 4.2 .48 8.5 8.4 1.9 3.4 14 14 3.3 2.4 1.6 8.2 8.1 7.0 .49 4.2 4.4 6.4 3.0 13 15 4.1 2.2 5.6 3.5 28 1.8 .46 7.6 2.8 3.4 2.6 3.6 16 2.3 2.1 8.8 7.5 22 2.0 .45 2.1 6.2 2.1 2.3 23 17 18 33 18 2.0 1.9 7.6 14 6.3 6.5 6.0 4.8 5.2 2.5 .53 .50 3.0 2.0 11 3.1 1.7 1.7 2.2 1.9 10 8.3 19 5.3 2.2 7.9 3.0 4.4 1.2 .48 8.6 18 1.3 1.8 4.9 20 4.9 1.9 4.7 4.2 5.6 1.2 .61 8.6 5.2 1.2 1.9 22 21 3.5 1.8 3.1 2.2 3.5 .78 2.0 2.3 3.3 1.6 1.9 7.0 22 2.7 1.7 9.0 3.1 2.9 1.1 1.2 3.3 2.6 1.7 2.3 3.8 23 2.3 1.5 6.4 8.8 2.5 4.5 .73 3.9 2.1 3.0 1.9 3.1 24 2.0 1.9 3.9 4.5 2.2 4.5 .69 1.5 1.9 4.9 1.7 2.7 25 1.9 2.9 2.6 9.9 2.1 3.4 .42 1.7 1.7 2.0 8.3 2.3 26 1.8 1.6 2.2 6.5 2.1 2.9 .39 38 1.6 3.7 50 2.1 27 1.7 1.7 5.8 4.0 2.8 2.4 1.6 36 1.4 1.7 9.6 2.1 28 1.6 1.6 8.3 4.5 2.6 2.0 5.9 15 1.5 3.4 5.0 2.6 29 5.9 1.6 15 3.0 1.8 1.7 2.5 39 3.5 16 2.6 2.6 30 31 28 12 3.9 --- 9.3 28 2.9 2.3 --- 1.6 1.3 1.1 --- 67 6.8 7.5 --- 8.3 3.5 1.9 2.0 7.7 --- TOTAL 179.4 168.7 264.1 182.9 244.7 71.82 32.80 292.73 197.2 190.8 194.3 194.0 MEAN 5.79 5.62 8.52 5.90 8.44 2.32 1.09 9.44 6.57 6.15 6.27 6.47 MAX 33 46 55 31 38 7.0 8.9 67 30 56 50 23 MIN CFSM 1.0 5.73 1.5 5.56 1.6 8.44 2.2 5.84 1.7 8.36 .78 2.30 .39 1.08 .55 9.35 1.4 6.51 1.2 6.09 1.7 6.21 1.5 6.41 IN. 6.60 6.21 9.72 6.73 9.00 2.64 1.21 10.77 7.26 7.02 7.15 7.14 AC-FT 356 335 524 363 485 142 65 581 391 373 385 385 WTR YR 1984 TOTAL 2213.45 MEAN 6.05 MAX 67 MIN .39 CFSM 5.99 IN 81.44 AC-FT 4390 WATER QUALITY RECORDS PERIOD OF RECORD.--APRIL 1913 TO CURRENT YEAR WATER-QUALITY DATA, WATUR YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURF: (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 05 1048 1.2 51 22.0 MAR, 19 1300 1.2 53 19.5 NOV, 22 1150 1.7 59 21.5 APR, 12 1233 .64 60 22.0 DEC. 13 1319 2.3 28 20.0 MAY, 22 1137 1.7 51 22.0 JAN. 17 1305 6.2 45 20.0 JUN, 05 0955 1.4 47 25.5 FEB, 23 1207 2.6 51 19.5 AUG, 02 1302 16 47 22.5 161 RIO ESPIRITU SANTO BASIN 50063500 QUEBRADA TORONJA AT EL VERDE, PR LOCATION.--Lat 18°19'43", long 65°49'14", Hydrologic Unit 21010005, in Caribbean National Forest, at downstream side of culvert on Highway 186, 0.22 mi (0.35 km) upstream from 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. Altitude of gage is 876 ft (267 m), from topographic map. REMARKS.--Records poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 18.0 cu 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 m) on basis of step-backwater analysis; minimum, no flow for part of each day Apr. 10, 17, 1983. EXTREMES FOR CURRENT PERIOD.--Peak discharges above base of 50 cu ft/s (1.42 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Dec. 2 0700 *10.0 0.28 1.61 0.491 Minimum discharge, 0.02 cu ft/s (0.001 cu m/s), Apr. 8-12, 18, 19, May 5, 7, 8, 11, 12, 22-24. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .19 .16 .07 .20 .11 .12 .03 .03 .06 .08 .23 .03 2 .10 .12 1.3 .18 .11 .10 .03 .03 .05 .07 .45 .03 3 .08 .11 .19 .17 .10 .09 .03 .05 .04 .10 .07 .04 4 .06 1.3 .15 .15 .21 .09 .03 .06 .04 .99 .13 .03 5 .05 .39 .19 .15 .12 .09 .03 .03 .04 1.0 .12 .05 6 .05 1.2 1.4 .15 .11 .08 .03 .05 .56 .18 .06 .04 7 .05 .31 .26 .15 .16 .09 .03 .03 .69 .13 .05 .03 B .07 .24 .19 .14 .10 .10 .03 .02 .12 .11 .04 .03 9 .10 .19 .17 .18 .77 .10 .03 .03 .25 .10 .04 .03 10 .05 .16 .21 .17 1.1 .09 .03 .05 .98 .09 .04 .03 11 .04 .15 .40 .15 .65 .09 .03 .03 .21 .11 .04 .53 12 .05 .13 .24 .30 .59 .09 .03 .03 .16 .08 .04 .09 13 .14 .12 .19 1.0 1.2 .09 .03 .03 .16 .07 .04 .25 14 .07 .11 .18 .38 .48 .09 .04 .04 .10 .11 .03 .19 15 .13 .10 .20 .20 .84 .05 .04 .05 .08 .08 .03 .07 16 .08 .09 .21 .21 .88 .06 .04 .03 .17 .07 .03 .28 17 1.3 .09 .18 .21 .34 .06 .04 .03 .23 .07 .03 .19 18 .45 .09 .27 .19 .26 .05 .03 .03 .10 .05 .03 .12 19 .20 .08 .25 .18 .23 .05 .03 .06 .20 .04 .03 .08 20 .14 .07 .18 .18 .23 .06 .04 .09 .14 .04 .03 .59 21 .11 .07 .16 .20 .20 .05 .06 .05 .10 .05 .03 .14 22 .09 .07 .24 .28 .18 .06 .05 .05 .08 .04 .04 .08 23 .09 .07 .18 .39 .18 .06 .03 .04 .08 .04 .03 .07 24 .08 .08 .15 .24 .18 .05 .03 .02 .07 .05 .02 .06 25 .07 .06 .15 .21 .16 .05 .03 .03 .07 .04 .09 .05 26 .07 .07 .13 .19 .16 .05 .04 .19 .07 .07 .85 .05 27 .06 .07 .27 .14 .17 .05 .05 .49 .07 .04 .22 .05 28 .06 .07 .22 .13 .15 .05 .04 .19 .07 .04 .09 .04 29 .45 .07 .27 .12 .14 .05 .03 .71 .09 .17 .04 .05 30 .74 .10 .23 .12 --- .04 .03 1.8 .13 .18 .04 .08 31 .51 --- .65 .11 --- .04 --- .14 --- .05 .03 --- TOTAL 5.73 5.94 9.08 6.77 10.11 2.19 1.04 4.51 5.21 4.34 3.04 3.40 MEAN .18 .20 .29 .22 .35 .071 .035 .15 .17 .14 .098 .11 MAX 1.3 1.3 1.4 1.0 1.2 .12 .06 1.8 .98 1.0 .85 .59 MIN .04 .06 .07 .11 .10 .04 .03 .02 .04 .04 .02 .03 CFSM 3.00 3.33 4.83 3.67 5.83 1.18 .58 2.50 2.83 2.33 1.63 1.83 IN. 3.28 3.40 5.20 3.87 5.79 1.25 .60 2.58 2.98 2.48 1.74 1.95 AC-FT 11 12 18 13 20 4.3 2.1 3.9 10 8.6 6.0 6.7 WTR YR 1984 TOTAL 61.36 MEAN .17 MAX 1.8 MIN .02 CFSM 2.83 IN 35.12 AC-FT 122 162 RIO ESPIRITU SANTO BASIN 50063500 QUEBRADA TORONJA AT EL VERDE, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--APRIL 1983 TO CUPRENT TSAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOW. SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 07 1030 .03 133 23.5 APR, 12 1326 .02 121 22.5 NOV, 22 1400 .07 105 23.0 MAY, 22 1236 .03 122 22.5 DEC, 13 1431 .17 Z6 21.0 JUN, 05 1112 .04 107 26.0 JAN, 17 1215 .17 102 21.0 AUG, 02 1502 .20 44 23.5 SEA, 23 1313 .17 102 21.0 SEP. 12 1030 .13 94 22.5 MAR, 19 0850 .05 123 20.0 163 RIO ESPIRITU SANTO BASIN 50063800 RIO ESPIRITU SANTO NEAR RIO GRANDE, PR LOCATION.--Lat 18°21'37", long 65°48'49", Hydrologic Unit 21010005, at left abutment, on downstream side of bridge on Highway 966, 0.1 mi (0.2 km) upstream from Quebrada Jim6nez, 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. Altitude of gage is 40 ft (12 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--18 years (1967-84), 56.6 cu ft/s (1.603 cu m/s), 89.17 in/yr (2,265 mm/yr), 41,010 acre-ft/yr (50.6 cu hm/yr); median of yearly mean discharges, 52 cu ft/s (1.47 cu m/s), 37,700 acre-ft/yr (46 cu hm/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 m), from rating curve extended above 600 cu ft/s (17.0 cu m/s) on basis of step-backwater analysis; minimum, 4.0 cu ft/s (0.113 cu m/s) July 3-5, 1975, Apr. 14, 15, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Nov. 6 0515 3,080 87.2 7.27 2.216 Dec. 2 0745 *12,400 351 12.07 3.679 Minimum discharge, 4.0 cu ft/s (0.111 cu m/s) Apr. 14, 15. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 66 23 31 23 18 688 38 25 20 19 22 22 7.0 6.3 5.4 5.0 27 20 40 26 39 223 20 18 3 4 17 16 25 476 39 26 22 20 18 54 18 17 6.0 5.6 5.4 35 16 13 37 414 30 84 19 17 5 15 100 27 19 29 17 5.4 8.1 13 317 60 48 6 17 455 247 18 35 17 5.5 7.8 131 43 23 48 7 38 54 42 17 52 16 5.3 11 313 27 18 18 8 40 38 26 17 34 16 5.1 8.0 36 22 16 15 9 36 32 23 24 202 23 5.3 11 89 20 15 15 10 19 29 26 52 318 18 5.1 21 190 19 14 19 11 16 26 72 26 143 14 5.4 11 63 25 13 163 12 15 24 42 133 89 13 5.7 7.0 39 21 12 86 13 43 22 23 307 303 19 5.0 48 87 17 12 108 14 29 21 20 99 82 46 4.5 18 33 47 11 125 15 28 20 34 41 204 16 4.4 24 22 30 11 30 16 23 20 52 62 192 15 4.7 10 35 18 11 172 17 296 19 55 76 49 28 4.9 13 78 16 11 99 18 180 18 77 82 37 13 4.8 12 24 17 11 62 19 61 21 55 37 33 8.5 4.8 28 117 15 11 36 20 44 18 29 56 36 7.7 5.2 57 46 14 11 251 21 35 17 23 34 27 7.3 5.8 13 23 14 11 58 22 24 16 69 37 24 7.0 6.3 15 19 18 11 28 23 21 16 47 73 22 11 5.4 20 16 21 11 22 24 22 15 26 46 21 8.1 5.3 15 16 31 11 20 25 20 23 21 74 20 8.2 4.7 11 16 18 60 18 26 17 15 19 65 20 8.8 4.8 196 15 23 260 17 27 16 15 28 32 25 8.6 4.7 246 15 16 100 17 28 15 14 54 28 26 3.5 29 110 14 18 34 20 29 202 14 88 24 20 8.0 9.9 294 29 131 24 16 30 307 22 62 22 --- 7.8 6.1 606 51 77 19 43 31 180 --- 193 21 7.7 --- 53 --- 24 21 --- TOTAL 1881 1639 2251 1627 2154 457.2 188.0 1924.7 1606 1576 1198 1628 MEAN 60.7 54.6 72.6 52.5 74.3 14.7 6.27 62.1 53.5 50.8 38.6 54.3 MAX 307 476 688 307 318 46 29 606 313 414 260 251 MIN 15 14 18 17 18 7.0 4.4 5.0 13 14 11 15 CFSM 7.04 6.33 8.42 6.09 8.62 1.71 .73 7.20 6.21 5.89 4.48 6.30 IN. 8.12 7.07 9.71 7.02 9.29 1.97 .31 8.31 6.93 6.80 5.17 7.02 AC-FT 3730 3250 4460 3230 4270 907 373 3820 3190 3130 2380 3230 CAL YR 1983 TOTAL 19952.1 MEAN 54.7 MAX 1060 MIN 6.7 CFSM 6.35 IN 86.09 AC-FT 39570 WTR YR 1984 TOTAL 18129.9 MEAN 49.5 MAX 688 MIN 4.4 CFSM 5.74 IN 78.23 AC-FT 35960 -- 164 RIO ESPIRITU SANTO BASIN 50063800 RIO ESPIRITU SANTO NEAR RIO GRANDE, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1958, 1961-66, 1968 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN CDLI- SPE- DIS- DEMAND, FORM, STREAM- CIFIC SOLVED CHEM- FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 INSTAN- DUCT- (STAND- TEMPER- 3ID- DIS- CENT (HIGH UM-MF TIME TANEOUS ANCE ARD ATURE ITT SOLVED SATUR- LEVEL) (COLS./ DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) OCT , 1983 11... 1450 16 101 7.8 27.5 1.1 8.2 104 32 K1400 DEC 08... 1205 25 98 7.6 23.0 2.5 9.2 107 <10 200 MAR , 1984 15... 1235 15 100 8.0 24.5 1.0 9.5 114 18 K890 MAY 02... 1155 5.0 122 7.7 26.0 <1.0 10.8 132 <10 300 JUN 28... 1110 14 99 7.5 27.0 1.1 8.7 109 15 540 AUG 20... 1530 11 114 7.7 29.0 .43 7.7 99 <10 210 STREP- TOCOCCI HARD- MAGNE- SODIUM POTAS- ALKA- FECAL, HARD- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE KF AGAR NESS NONCAR- DIS- DIS- DIS- SORP- DIS- FIELD DIS- (COLS. (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED PER AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L DATE 100 ML) CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) OCT , 1983 11... 470 31 0 6.6 3.6 7.2 .6 .40 32 3.6 DEC 08... 2500 31 MAR p 1984 15... 380 -- -- 31 MAY 02... 540 41 0 8.9 4.6 8.7 .6 .50 43 3.0 JUN 28... 230 33 AUG 20... 110 38 0 8.3 4.3 8.3 .6 .40 41 3.2 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 N024403 AMMONIA ORGANIC SOLVED SOLVED (MG/L DU- (TONS SUS- TOTAL TOTAL TOTAL TOTAL (MG/L (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L DATE AS CL) AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) OCT , 1983 11... 10 <.10 18 71 3.1 3 <.01 <.10 <.01 DEC 08... -- 21 <.01 <.10 .07 MAR , 1984 15... 3 <.01 <.10 <.01 MAY 02... 11 <.10 21 83 1.1 1 <.01 <.10 .04 1.8 JUN 28... *' 2 (.01 <.10 .02 AUG 20... 11 .50 22 83 2.5 1 <.01 <.10 <.01 K = non-idoal count RIO ESPIRITU SANTO BASIN 50063800 RIO ESPIRITU SANTO NEAR RIO GRANDE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 NITRO- CHRO- GEN,AM- BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, MONIA + PMOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL ORGANIC PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS N) AS P) AS AS) AS BA) AS CD) AS CR) AS PS) AS MG) AS SE) AS AG) OCT , 1983 11... .20 .03 2 <100 2 5 1 (.1 <1 <1 DEC 08... <.10 .04 MAR , 1984 15... <.10 <.01 MAY 02... 1.8 .01 2 <100 1 <1 5 .1 <1 <1 JUN 28... <.10 <.01 AUG 20... .20 .02 165 166 RIO MAMEYES BASIN 50065500 RIO MAMEYES NEAR SABANA, PR LOCATION.--Lat 18°19'46", long 65°45'04", on left bank, at bridge on Highway 988, 1.4 mi (2.3 km) west of Sabana, 2.0 mi (3.2 km) down­ stream from Rio de la Mina, and 3.2 mi (5.1 km) southeast of Mameyes. DRAINAGE AREA.--6.88 sq mi (17.8 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--August 1967 to December 1973. June 1983 to current year. GAGE.--Water-stage recorder. Altitude of gage is 275 ft (83.8 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--7 years (1968-73, 1984), 57.7 cu ft/s (1.634 cu m/s), 113.89 in/yr (2,893 mm/yr), 41,800 acre-ft/yr (51.5 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 19,800 cu ft/s (561 cu m/s) Sept. 4, 1973, gage height, 13.02 ft (3.968 m), from rating curve extended above 1,800 cu ft/s (51.0 cu m/s) on basis of slope-area measurement of peak flow; minimum, 5.1 cu ft/s (0.144 cu m/s) Apr. 8, 9, 1970. EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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) (m) Dec. 2 0715 *8,030 228 9.51 2.899 July 4 2015 4,500 128 7.86 2.396 May 30 0330 6,020 170 8.65 2.637 Minimum discharge, 9.6 cu ft/s (0.272 cu m/s) Apr. 15. DISCHARGE. IN CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 71 49 24 36 25 34 12 14 50 72 47 22 2 41 39 376 26 23 31 12 14 31 53 110 22 3 39 51 28 23 25 28 12 29 28 53 30 21 4 36 217 21 21 56 24 12 39 28 319 40 21 5 35 73 20 20 28 24 12 17 46 165 41 32 6 33 181 77 19 36 24 15 19 296 66 27 29 7 58 49 26 18 63 23 14 22 210 57 23 21 3 74 40 22 17 26 24 30 16 84 50 21 19 9 64 35 19 30 81 32 12 25 105 45 22 23 10 43 32 23 45 244 23 12 39 106 45 20 25 11 37 30 68 25 99 22 18 20 95 44 18 42 12 38 28 31 64 67 24 13 20 84 40 17 58 13 62 27 20 152 113 31 11 47 97 35 17 44 14 53 25 19 73 75 75 11 28 72 38 14 69 15 49 24 38 47 165 20 11 27 58 28 13 30 16 41 25 37 69 112 22 12 28 67 24 14 112 17 62 23 54 79 53 47 11 28 103 21 13 54 18 147 24 71 46 43 21 11 42 61 23 12 56 19 60 26 39 38 38 16 12 70 89 20 12 38 20 101 21 29 44 40 17 13 59 64 22 12 125 21 55 21 23 31 30 21 16 23 62 22 12 51 22 66 21 60 38 31 22 13 23 59 23 14 37 23 47 19 37 56 31 27 13 32 53 27 12 31 24 44 23 26 45 30 18 11 29 51 30 11 29 25 39 30 21 72 28 19 17 42 51 25 50 26 26 36 22 21 44 29 13 15 123 53 29 133 24 27 36 22 32 30 30 14 22 118 58 25 45 25 28 34 22 54 29 30 13 34 78 50 25 25 30 29 35 21 80 26 31 12 14 188 49 75 22 32 30 126 26 43 26 --- 12 15 421 51 48 20 60 31 72 --- 123 24 12 --- 69 --- 28 21 --- TOTAL 1734 1246 1562 1318 1682 750 436 1749 2311 1577 888 1208 MEAN 55.9 41.5 50.4 42.5 58.0 24.2 14.5 56.4 77.0 50.9 28.6 40.3 MAX 147 217 376 152 244 75 34 421 296 319 133 125 MIN 33 19 19 17 23 12 11 14 28 20 11 19 CFSM 8.13 6.03 7.33 6.18 8.43 3.52 2.11 8.20 11.2 7.40 4.16 5.86 IN. 9.37 6.74 8.44 7.13 9.09 4.05 2.36 9.46 12.49 8.53 4.80 6.53 AC-FT 3440 2470 3100 2610 3340 1490 865 3470 4580 3130 1760 2400 WTR TR 1984 TOTAL 16461 MEAN 45.0 MAX 421 MIN 11 CFSM 6.54 IN 88.99 AC-FT 32650 167 RIO MAMEYES BASIN 50065500 RIO MAMEYES NEAR SABANA, PR - -Continued WATER QUALITY RECORDS PERIOD C= RECORO.--JUNE 1933 TO CURRENT YEAR WATER-QUALITY DATA. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLCW, SPECIFIC COA- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CF5) (UMHOS) (DEG C) (EFS) (UMHOS) (DEG C) OCT, 07 1000 138 94 24.5 APR, 13 1133 11 149 24.5 NOY, 18 1132 22 108 23.0 MAY. 24 1349 27 87 23.5 DEC, 14 1140 18 P5 22.0 JUN, 06 1108 96 55 26.0 JAN, 13 1145 53 69 23.0 JUL, 20 1159 22 101 27.0 FEB, 22 1136 31 ?9 20.5 AUG, 05 1117 26 108 24.5 MAR, 20 1030 18 105 21.0 SEP, 13 1026 38 860 23.5 MAR, 29 1440 12 116 26.0 168 RIO MAMEYES BASIN 50065700 RIO MAMEYES AT HIGHWAY 191 AT MAMEYES, PR LOCATION.--Lat 18°22'03", long 65°46'14", Hydrologic Unit 21010005, on left bank, 0.2 mi (0.3 km) upstream from Quebrada Anion, 0.3 mi (0.5 km) downstream from Quebrada Tabonuco, and 0.3 mi (0.5 km) south of Mameyes. DRAINAGE AREA.--11.8 sq mi (30.6 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1966 to current year. GAGE.--Water-stage recorder. Altitude of gage is 22 ft (6.7 m), from topographic map. Prior to Jan. 1, 1974 at datum 4.88 ft (1.487 m) higher and Jan. 1, 1974 to Mar. 25, 1976 at datum 4.00 ft (1.219 m) higher. REMARKS.--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 m/s), Oct. 24, 1974, gage height, 18.79 ft (5.727 m), 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, 5.0 cu ft/s (0.142 cu m/s) Apr. 28, 1975. EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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) Dec. 2 0745 *7,780 220 14.39 4.386 Minimum discharge, 8.1 cu ft/s (0.229 cu m/s) Apr. 20, 21. DISCHARGE. IN CUBIC FEET PER SECOND • WATER YEAR OCTOBER 1983 TO SEPTEMBER 1 984 MEAN V ALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 85 29 28 56 32 28 13 10 105 39 59 27 2 29 23 581 38 32 26 14 10 46 21 327 22 3 21 30 51 34 31 23 14 11 35 28 57 22 4 20 530 34 30 99 23 14 82 58 595 84 25 5 19 151 31 28 43 25 14 15 68 317 95 48 6 21 370 143 27 40 26 15 17 457 78 41 58 7 48 90 44 26 86 26 14 21 526 57 32 24 8 51 61 35 25 33 23 13 16 136 46 28 23 9 46 49 32 36 120 43 14 25 145 40 28 26 10 24 42 33 69 467 27 14 52 208 42 25 33 11 18 38 99 34 230 23 21 25 117 41 23 64 12 18 34 51 87 94 23 15 20 88 39 25 92 13 55 32 30 271 294 26 11 70 136 31 31 58 14 40 29 27 96 136 51 11 32 64 44 25 142 15 30 28 53 58 296 24 11 28 42 39 25 35 16 25 28 57 85 224 27 11 30 74 31 28 196 17 100 27 73 97 70 58 11 33 170 27 23 85 18 179 25 95 78 52 25 10 56 48 36 21 67 19 54 33 59 45 45 19 9.6 70 95 27 20 36 20 142 27 42 66 46 20 9.0 132 49 28 19 439 21 47 25 33 41 37 21 9.4 26 36 32 20 70 22 56 24 108 48 33 27 9.8 28 28 37 23 31 23 34 21 63 74 31 37 11 38 25 43 20 26 24 26 21 38 46 29 23 11 33 22 47 19 25 25 22 35 31 99 28 21 17 53 21 33 77 22 26 20 24 29 72 29 19 17 244 24 31 341 21 27 20 25 39 44 28 17 12 271 30 25 134 22 28 25 25 84 39 27 16 71 192 24 27 44 22 29 74 23 119 35 25 14 15 247 31 138 30 28 30 187 30 63 34 --- 13 11 722 36 125 24 98 31 128 --- 216 33 13 --- 167 --- 40 28 --- TOTAL 1664 1929 2421 1352 2737 792 442.8 2776 2944 2184 1776 1887 MEAN 53.7 64.3 78.1 59.7 94.4 25.5 14.8 89.5 98.1 70.5 57.3 62.9 MAX 187 530 581 271 467 58 71 722 526 595 341 439 MIN 18 21 27 25 25 13 9.0 10 21 21 19 21 CFSM 4.55 5.45 6.62 5.06 8.00 2.16 1.25 7.59 8.31 5.98 4.86 5.33 IN. 5.25 6.08 7.63 5.84 8.63 2.50 1.40 8.75 9.28 6.83 5.60 5.95 AC-FT 3300 3830 4800 3670 5430 1570 878 5510 5840 4330 3520 3740 CAL YR 1983 TOTAL 26032.5 MEAN 71.3 MAX 1160 MIN 8.0 CFSM 6.04 IN 82.06 AC-FT 51640 WTR YR 1984 TOTAL 23404.8 MEAN 63.9 MAX 722 MIN 9.0 CFSM 5.42 IN 73.78 AC-FT 46420 169 RIO MAMEYES BASIN 50065700 RIO MAMEYES AT HIGHWAY 191 AT MAMEYES, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1931 TO CURRENT YEAR WATER-DUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOW, SPECI'IC :ON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TORE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 06 1127 22 144 27.0 APR, 12 0937 16 147 24.5 MOVe 21 1510 26 162 28.0 MAY, 23 1640 31 115 27.0 DEC, 15 1025 37 126 23.5 JUN, 06 1346 105 70 26.5 JAN, 19 0915 45 133 23.0 JUL, 19 1156 28 135 29.0 Fe9, 0? 1313 47 103 23.0 AUG, 06 1351 39 144 30.0 MAR, 20 1233 22 163 23.0 SE°. 13 1352 46 120 26.0 170 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 mi (10.26 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1979 to current year. GAGE.--Water-stage recorder. Altitude of gage is 260 ft (80 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--5 years (1980-84), 17.5 cu ft/s (0.496 cu m/s), 60.01 in/yr (1,524 mm/yr), 12,680 acre-ft/yr (15.6 cu hm/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/s (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 above base of 1,500 cu ft/s (42.5 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Dec. 2 0645 *1,730 49.0 12.50 3.810 Minimum discharge, 1.2 cu ft/s (0.034 cu m/s) May 5, 6, 8, 11, 12. DISCHARGE, IN CUBIC FEET PER SECONDS WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 19 7.2 5.2 4.7 44 8.7 6.2 9.5 161 38 3.8 177 11 6.8 5.4 11 6.9 6.3 5.7 4.9 3.5 3.8 4.5 10 5.8 8.3 5.9 4.9 4.6 4.9 2.2 2.4 2.2 2.1 1.9 1.5 1.5 5.8 10 1.4 22 6.9 4.2 2.7 4.6 9.0 4.5 4.1 76 43 6.8 90 8.6 11 10 2.7 2.6 2.5 2.4 3.4 6 7 3 9 10 3.9 10 15 22 8.0 37 16 14 12 11 12 6.1 5.1 4.6 4.9 5.0 5.2 4.5 6.6 11 4.3 25 5.7 16 103 4.4 4.0 4.5 5.1 3.7 2.2 1.9 2.0 2.0 1.9 2.1 2.1 1.5 1.8 3.5 127 153 29 16 26 12 7.5 5.$ 6.1 6.5 5.1 3.9 3.4 3.4 3.2 4.4 2.5 2.4 4.0 6.6 11 12 13 14 15 3.7 4.3 10 9.6 5.5 9.6 8.6 8.0 7.4 6.8 8.9 6.0 4.1 3.5 12 5.3 11 36 13' 11 34 15 48 25 54 3.4 3.6 3.6 6.7 3.9 3.5 2.4 1.8 1.9 1.8 1.7 1.5 2.3 1.8 1.7 26 18 18 13 10 5.1 4.5 3.8 4.4 3.7 2.8 3.0 4.0 2.7 2.6 6.6 9.9 6.6 33 5.8 16 17 18 19 20 4.3 12 39 16 44 7.3 6.2 6.5 7.7 7.0 9.1 16 18 7.8 6.2 13 14 3.3 5.7 7.3 24 13 11 9.7 9.7 4.8 5.3 3.4 2.8 2.7 2.1 2.2 1.9 1.9 1.9 2.1 3.2 1.8 23 19 12 26 23 17 12 3.4 3.0 3.7 2.7 3.7 3.8 2.7 2.3 2.2 2.2 31 21 16 11 59 21 22 23 24 25 13 34 12 10 8.7 7.5 5.1 4.3 4.7 5.8 4.4 23 11 5.2 4.0 5.8 23 18 7.7 15 8.1 7.1 7.4 6.2 5.9 4.9 4.4 3.4 2.6 3.4 1.8 1.9 1.8 1.7 2.0 1.9 3.3 2.9 1.9 5.0 12 9.6 7.3 6.2 6.1 3.6 3.2 3.3 2.8 2.2 2.4 2.8 2.4 2.3 9.6 20 8.0 5.0 3.6 3.2 26 27 28 29 30 31 9.7 9.4 9.9 8.1 34 19 3.5 3.9 3.5 3.1 4.0 --- 5.6 8.1 17 26 11 37 11 5.7 4.6 3.9 4.3 3.6 6.6 6.1 5.8 5.4 --- 2.5 2.4 2.5 2.4 2.5 2.2 2.0 4.1 5.1 1.8 1.6 --- 19 26 14 71 240 38 5.4 5.2 4.8 7.6 7.8 --- 2.4 2.1 2.9 17 10 2.9 47 20 5.3 3.3 2.7 2.9 2.8 3.3 3.5 11 37 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 455.2 14.7 44 3.7 3.71 4.28 903 433.9 14.5 161 3.1 3.66 4.07 861 480.6 15.5 177 3.5 3.91 4.51 953 294.3 9.49 36 3.6 2.40 2.76 584 483.6 16.7 103 3.5 4.22 4.54 959 123.7 3.99 3.3 2.2 1.01 1.16 245 66.0 2.20 5.1 1.6 .56 .62 131 512.3 16.5 240 1.4 4.17 4.81 1020 638.4 21.3 153 2.7 5.38 6.00 1270 264.9 8.55 76 2.1 2.16 2.49 525 274.4 8.85 90 2.2 2.24 2.58 544 330.8 11.0 59 2.4 2.78 3.11 656 CAL YR 1983 TOTAL 7094.33 WTR YR 1984 TOTAL 4358.10 MEAN 19.4 MEAN 11.9 MAX 545 MAX 240 MIN .96 MIN 1.4 CFSM 4.90 CFSM 3.01 IN 66.63 IN 40.93 AC-FT 14070 AC-FT 8640 171 RIO SABANA BASIN 50067000 RIO SABANA AT SABANA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1931 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1933 TO SEPTEMBER 1984 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA..­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 11 1225 3.6 121 26.5 APR, 13 0906 2.1 152 22.5 NOV. 19 1350 5.2 163 26.0 MAY, 24 1131 1.9 148 23.0 OEC, 14 1525 3.3 121 24.5 JUN. 07 1402 60 65 26.5 JAN. 1 1559 5.2 123 23.0 JUL. 20 0929 5.9 110 27.5 FES. 22 1414 7.7 108 22.5 AUG, 07 1649 3.6 136 27.5 MAR, 21 1337 2.8 147 23.0 SEP. 14 1059 71 49 26.0 MAR, 30 0945 2.4 146 24.0 172 RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDO, PR LOCATION.--Lat 18°17'56", long 65°41'42", Hydrologic Unit 21010005, on left bank off Highway 976, 0.1 mi (0.2 km) upstream from Highway 977 bridge, 0.3 mi (0.5 km) downstream from Quebrada Person, 1.1 mi (1.8 km) northeast of Colonia Paralso, and 3.3 mi (5.3 km) southwest of Fajardo. DRAINAGE AREA.--14.9 sq mi (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. Datum of gage is 137.60 ft (41.940 m) above mean sea level. Due to flood damage, gage datum has had changes as follows: Mar. 24, 1961 to May 5, 1969, 138.95 ft (42.352 m); May 6, 1969 to Mar. 16, 1972, 135.05 ft (41.163 m); Mar. 17, 1972 to Mar 25, 1975, 138.60 ft (42.245 m). REMARKS.--Records fair. Low flow affected by diversions for water supply. AVERAGE DISCHARGE.--23 years (1962-84), 67.8 cu ft/s (1.920 cu m/s), 61.79 in/yr (1,569 mm/yr), 49,120 acre-ft/yr (60.6 cu hm/yr); median of yearly mean discharges, 69 cu ft/s, (1.95 cu m/s), 50,000 acre-ft/yr (62 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 19,600 cu ft/s (555 cu m/s), Oct. 24, 1974, gage height, 13.62 ft (4.151 m), datum then in use, from 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, 0.86 cu ft/s (0.024 cu m/s) May 3, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges above base of 3,500 cu ft/s (99.1 cu m/s), and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Oct. 18 1630 *2,940 83.3 7.21 2.198 Minimum discharge, 0.86 cu ft/s (0.024 cu m/s) May 3. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 71 26 19 17 15 30 24 31 687 156 7.6 393 33 20 16 57 29 25 22 18 17 18 12 43 22 23 20 14 12 12 3.7 3.4 3.2 3.0 2.9 1.6 2.6 1.5 9.6 2.2 104 42 28 22 20 27 17 16 209 164 14 271 31 30 24 7.4 6.9 6.3 7.6 8.2 6 7 8 9 10 14 38 57 81 31 191 67 51 42 36 112 26 18 16 15 16 14 13 24 64 34 106 27 78 309 11 10 11 31 12 2.8 2.6 2.4 2.1 2.1 1.0 1.5 1.3 1.0 3.2 310 459 129 84 81 38 27 21 19 21 15 12 9.8 10 8.5 19 6.2 4.4 5.4 12 11 12 13 14 15 23 22 48 29 29 31 26 23 20 19 24 19 11 10 19 23 57 195 74 47 167 79 87 72 216 8.9 8.1 8.3 20 12 8.8 6.5 2.7 2.1 1.9 3.6 1.5 9.5 5.0 3.0 37 100 85 53 37 16 15 13 13 19 7.2 6.8 8.1 6.6 5.8 7.8 50 23 132 19 16 17 18 19 20 22 26 362 80 176 21 13 16 24 17 30 44 39 23 21 52 66 34 26 39 173 62 46 39 35 11 33 12 7.5 6.5 1.9 1.9 1.6 1.5 1.2 3.4 3.4 16 83 101 36 168 103 94 55 16 12 42 12 11 8.6 6.4 5.3 7.4 12 91 73 80 39 481 21 22 23 24 25 51 118 47 33 25 18 22 14 12 14 15 109 46 26 17 25 103 59 29 51 31 27 25 24 23 6.0 7.0 7.0 7.0 7.0 1.2 1.5 1.6 1.7 1.8 14 13 9.9 18 12 39 32 28 24 22 10 12 16 10 9.4 12 22 15 11 57 99 37 25 19 15 26 27 28 29 30 31 25 23 18 39 213 33 9.8 9.4 8.6 6.3 13 --- 24 20 80 73 39 165 28 20 13 15 14 12 25 21 21 19 --- 6.0 5.0 5.0 4.5 4.5 3.9 1.9 3.0 43 4.6 2.1 --- 139 97 109 148 543 129 19 24 18 31 24 --- 9.7 8.2 14 93 62 17 317 83 24 15 11 8.6 13 11 26 30 51 --- TOTAL MEAN MAX MIN CFSM IN. 8C-FT 1861 60.0 362 14 4.03 4.65 3690 1657.1 55.2 687 6.3 3.71 4.14 3290 1510.6 48.7 393 7.6 3.27 3.77 3000 1279 41.3 195 12 2.77 3.19 2540 1858 64.1 309 12 4.30 4.64 3690 346.2 11.2 33 3.9 .75 .86 687 120.7 4.02 43 1.2 .27 .30 239 1486.3 48.0 543 1.0 3.22 3.71 2950 2358 78.6 459 18 5.28 5.89 4680 987.3 31.8 209 8.2 2.13 2.46 1960 1075.1 34.7 317 5.3 2.33 2.68 2130 1405.2 46.8 481 4.4 3.14 3.51 2790 CAL YR 1783 TOTAL 23298.1 wTR YR 1984 TOTAL 15945.0 MEAN 63.3 M E AN 43.6 MAX 1500 MAX 687 MIN 3.9 MIN 1.0 CFSM 4.28 CFSM 2.93 IN 58.16 IN 39.81 AC-FT 46210 AC-FT 31630 RIO FAJARDO BASIN 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 since January 1983. USD-49 Sediment sampler since February 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, 1,360 mg/L April 21, 1983; 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 tonnes) May 9, 1983. EXTREMES FOR CURRENT YEAR.-- SEDIMENT CONCENTRATIONS: Maximum daily mean, 632 mg/L Oct. 18; Minimum daily mean, 1.0 mg/L several days. SEDIMENT LOADS: Maximum daily, 1,890 tons (1,710 tonnes) Oct. 18; minimum daily, 0.01 tons (0.01 tonnes) several days. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI- STREP- SPE." DIS- DEMAND, FORM. TOCOCC/ STREAM- CIFIC SOLVED CHEM.. FECAL, FECAL. FLOW, CON- PH TtJR- OXYGEN, (PER.. ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT {HIGH UM-Mf (COLS. TIME TANEOUS ANCE ARD ATURE /TY SOLVED SATUR- LEVEL) (COLS./ PER DATE CCFS) (UNHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) CMG/L) 100 ML) 100 ML) OCT , 1983 03... 1410 21 125 8.2 29.5 <1.0 9.0 118 24 200 570 DEC 07... 1110 27 110 7.3 24.5 3.6 11.0 132 13 440 600 FEB , 1984 02... 1135 17 115 7.8 25.5 2.7 9.6 118 <10 210 270 MAY 01... 1315 1.6 134 7.7 29.0 1.4 9.6 125 21 48 (32 JUN 04... 1345 21 111 7.6 31.0 1.4 11.0 149 <10 K1200 410 AUG 06... 1245 16 114 7.8 29.5 11 9.0 118 <10 120 K160 HARD:. MC-UNE- SODIUM POTAS- ALKA.. CHLO- FLUO- HARO- NESS, CALCIUM SIM, SODIUM. AD- SLUM, LINITY SULFATE RIDE' RIDE, NESS NONCAR- DIS- ors- ors- SORP- DIS- FIELD ors- ors- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS CMG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT r 1983 03... 31 0 6.4 3.7 11 .9 1.2 34 4.7 13 .10 DEC 07... 30 FEB ' 1984 02... 34 MAY 01... 37 0 7.6 4.3 13 1 1.1 41 4.5 15 .20 JUN 04... 28 AUG 06... 29 0 6.2 3.4 10 .8 1.1 30 4.6 12 <.10 SOLIDS, SOLIDS, NITRO* SILICA, SUM OF SOLIDS. RESIDUE NITRO- NITRO- NITRO- NITRO- GEN'AM DES' CONSTI- OIS- AT 105 GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. Cr NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN' (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER °E4DED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) OCT r 1983 3... 27 87 5.0 7 <.01 .30 <.01 .S0 1.1 DEC 07... -- 4 <.01 .30 <.01 .20 .50 FEB , 1984 02... 12 <.01 .30 <.01 .60 .90 MAY 01... 28 98 .42 4 <.01 .20 .07 1.3 1.4 1.6 JUN 4... 1 <.01 <.10 .02 1.3 1.3 AUG 06... 23 78 3.4 2 <.01 <.10 <.01 .40 K = non-ideal count 173 174 RIO FAJARDO BASIN 53071000 RIO FAJARDO NEAR FAJARDO, PR--Continued WATER-QUALITY RECORDS, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- 3ARIUM• CADMIUM MIUM• LEAD, MERCURY SILVER, NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV"' NIUMr RECOV­ TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L CMG/L CUG/L (UG/L (UG/L (UG/L CUG/L (UGIL (UG/L CUM DATE AS NO3) AS P) AS AS) AS BA) AS CO) AS CR) AS PB) AS HG) AS SE) AS AG) OCT , 1983 3... 4.9 .03 4 <100 1 4 1 .3 <1 <1 DEC 07... 2.2 .02 FEB • 1984 02... 4.0 .04 MAY 01... 7.1 .02 1 <100 1 <1 6 <.1 <1 <1 JUN 4... .03 AUG 06... .03 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW. SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) COED C) (CFS) CUMHOS) (OEG C) JAN, 04 1155 20 118 26.0 MAY, 01 1230 1.6 128 29.0 MAR. 06 1134 11 125 26.0 CHLOR- DI- PCB, ALDRIN• DANE, ODD, DOE, DDT, AEINON, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) OWL) (UWL) CUG/L) (UG/L) (UG/L) CUG/L) JUN • 1984 04... 1345 <.1 (.01 <.1 <.01 <.01 <.01 (.01 HEPTA- METH- DI- ENDO- HEPTA- CHLOR MALA- OXY- ELDRIN SULFAN• ENDRINr ETHION• CHLOR, EPDXIDE LINDANE THION, CHLOR• TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE CUG/L) CUG/L) CUG/L) CUG/L) CUS/L) (UG/L) (UG/L) CUG/L) (UG/L) JUN • 1984 04... <.01 <.01 (.01 (.01 <.01 <.31 <.01 <.01 <.01 NAPH- THA- METHYL METHYL LENES• PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION• THION• MIREX, THION• CHLOR. THANE APHENE, TRI­ TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION DATE CUG/L) LUG/L) (UG/L) CUG/L) (UG/L) (UG/L) CUG/L) (UG/L) JUN • 1984 04... (.01 <.01 <.01 <.01 <.10 <.1 <1 <.01 SEDI- SE)I- SED. SED. SED. MINT, MEAT, SUSP. SUSP. SUSP. STREAM- SJS- SUS- FALL FALL FALL FLOW. PENDED PENDED DIAM. DIAM. DIAM. TEMPER- 'ASIAN- CONCEN- On- X FINER X FINER X FINER TIME ATURE TANEOUS TRATION CHARGE THAN THAN THAN DATE (DEG C) CCFS) (MGM CT/DAY) .002 MM .004 MM .003 MM JAN , 1983 13... 1015 25.9 106 1650 475 3 5 8 13... 1030 25.0 156 1760 741 2 3 8 13... 1045 25.0 173 938 438 7 12 20 MAY r 1934 19 2245 24.5 1280 1580 5460 19 22 30 SE). SED. SE). SED. SED. SED. SED. SUSP. SUSP. SUSP. SUS'. SUSP. SUSP. SUSP. FALL FALL SIEVE SIEVE SIEVE SIEVE SIEVE DIAM. DIAM. DIAM. DIAN. DIAM. DIAM. DIAM. X FINER I FINER X FINER X FINER X FINER X FINER X FINER THAN THAN THAN THAN THAN THAN THAN DATE .016 MM .031 MM .062 MM .125 MM .250 MM .500 MM 1.00 MM JAN , 1984 13... 23 47 73 79 88 95 99 13... 29 47 64 74 86 96 99 13... 35 59 69 31 90 96 93 MAY , 1934 19 43 66 89 92 97 99 100 RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TjR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARD ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1983 03... 1410 21 125 8.2 29.5 <1.0 9.0 118 24 200 570 DEC 07... 1110 27 110 7.3 24.5 3.6 11.0 132 13 440 600 FEB , 1934 02... 1135 17 115 7.8 25.5 2.7 9.6 118 <10 210 270 MAY 01... 1315 1.6 134 7.7 29.0 1.4 9.6 125 21 48 K32 JUN 04... 1345 21 111 7.6 31.0 1.4 11.0 149 <10 K1200 410 AUG 06... 1245 16 114 7.8 29.5 11 9.0 118 <10 120 K160 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- DIS- On- SORP- DIS- FIELD DIS- DIS- OIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) AS CL) AS F) OCT , 1913 03... 31 0 6.4 3.7 11 .9 1.2 34 4.7 13 .10 DEC 07... 30 -- FEB , 1954 02... -- 34 MAY 01... 37 0 7.6 4.3 13 1 1.1 41 4.5 15 .20 JUN 04... -- 28 AUG 06... 29 0 6.2 3.4 10 .8 1.1 30 4.6 12 <.10 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L On- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 3... 27 87 5.0 7 <.01 .30 <.01 DEC 07... 4 <.01 .30 <.01 FEB , 1984 02... -- 12 <.01 .30 <.01 MAY 01... 28 98 .42 4 <.01 .20 .07 JUN 4... -- 1 <.01 <.10 .02 AUG 06... 23 78 3.4 2 <.01 <.10 <.01 K = non-ideal count . 80 1.1 . 20 .50 -- .60 .90 1.3 1.4 1.6 1.3 1.3 .40 175 176 RIO FAJARDO BASIN 50071000 RIO FAJARDO NR FAJARDO. PR--Continued WATER-QUALITY DATA. WATER YEAR OCTOBER 1933 TO SEPTEMBER 1984 MEAN MEAN MEAN MEAN CONCEN­ SEDIMENT MEAN C ONCEN­ SEDIMENT MEAN CONCEN­ SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE T RATION DISCHARGE OISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 71 54 11 30 10 .31 7.6 8 .16 2 26 25 1.8 24 5 .32 393 364 1220 3 19 24 1.2 31 19 1.6 33 35 3.1 4 17 26 1.2 657 347 334 20 22 1.2 5 15 48 1.9 156 33 26 16 10 .43 6 14 6 .23 191 68 59 112 60 50 7 38 1 .03 67 9 1.6 26 9 .63 8 57 57 5.4 51 25 3.4 18 2 .10 9 31 41 9.0 42 10 1.1 16 9 .39 10 31 18 1.5 36 9 .37 15 4 .16 11 23 1 .06 31 10 .84 24 8 .52 12 22 2 .11 26 9 .63 19 4 .21 13 48 5 .65 23 9 .58 11 7 .21 14 29 1 .08 20 23 1.2 10 1 .03 15 29 1 .06 19 9 .46 19 1 .05 16 22 1 .07 21 6 .34 30 2 .16 17 26 2 .17 18 6 .29 44 3 .36 18 362 632 1890 16 6 .26 39 1 .11 19 80 53 11 24 7 .45 23 2 .12 20 176 80 100 17 8 .37 21 1 .06 21 51 2 .28 18 1 .05 15 2 .08 22 118 130 185 22 3 .18 109 50 50 23 47 21 2.7 14 13 .49 46 12 1.5 24 33 1 .09 12 12 .39 26 7 .49 25 25 1 .07 14 15 .57 17 1 .05 26 25 5 .34 9.8 12 .32 24 1 .06 27 23 11 .68 9.4 11 .28 20 10 .54 28 18 18 .87 8.6 10 .23 80 7 1.5 29 39 3 .13 6.3 9 .15 73 51 15 30 213 192 266 13 9 .32 39 4 .36 31 83 21 4.7 --- --- --- 165 370 445 TOTAL 1861 2496.32 1657.1 937.10 1510.6 1792.58 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/OAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH 1 57 8 1.2 17 2 .09 23 6 .37 2 29 7 .55 18 21 1.0 20 15 .81 3 25 6 .41 12 1 .03 14 4 .15 4 22 3 .18 43 25 2.9 12 36 1.2 5 18 1 .05 22 4 .24 12 23 .75 6 16 1 .04 34 10 .92 11 5 .11 7 14 1 .04 106 49 28 10 1 .03 8 13 1 .04 27 8 .58 11 4 .12 9 24 10 .65 78 38 12 31 25 4.1 10 64 16 2.8 309 120 142 12 4 .13 11 28 1 .03 167 71 52 8.9 11 .26 12 57 2 .31 79 10 2.1 8.1 1 .02 13 195 226 285 87 12 2.8 8.3 1 .02 14 74 34 6.8 72 4 .78 20 10 .54 15 47 8 1.0 216 136 121 12 13 .42 16 52 7 .98 173 55 53 11 7 .21 17 66 8 1.4 62 1 .17 33 21 5.0 18 34 15 1.4 46 1 .12 12 2 .06 19 26 29 2.0 39 2 .21 7.5 6 .12 20 39 10 1.1 35 10 .95 6.5 15 .26 21 25 9 .61 31 1 .08 6.0 5 .08 22 108 130 138 27 1 .07 7.0 23 .43 23 59 15 2.4 25 2 .14 7.0 37 .70 24 29 6 .47 24 4 .26 7.0 45 .85 25 51 7 .96 23 7 .43 7.0 2 .04 26 28 8 .60 25 3 .20 6.0 8 .13 27 20 5 .27 21 3 .17 5.0 3 .04 28 18 6 .29 21 19 1.1 5.0 1 .01 29 15 43 1.7 19 8 .41 4.5 13 .16 30 14 20 .76 --- --- --- 4.5 1 .01 31 12 3 .10 3.9 1 .01 TOTAL 1279 452.19 1858 423.75 346.2 17.14 177 RIO FAJARDO BASIN 50071000 RIO FAJARDO NR FAJARDO, PR-Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEOIMENT 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 3.7 2 .02 1.6 3 .01 104 41 30 2 3.4 26 .24 2.6 2 .01 42 1 .11 3 3.2 17 .15 1.5 3 .01 28 9 .68 4 3.0 2 .02 9.6 9 .23 22 2 .12 5 2.9 30 .23 2.2 2 .01 20 1 .05 6 2.8 6 .05 1.0 4 .01 310 201 701 7 2.6 21 .15 1.5 8 .03 459 185 493 8 2.4 35 .23 1.3 10 .04 129 15 8.9 9 2.1 15 .09 1.0 22 .06 84 22 9.1 10 2.1 35 .20 3.2 10 .09 81 31 6.8 11 8.8 26 .62 3.6 10 .10 87 16 6.0 12 6.5 15 .26 1.5 12 .05 100 60 40 13 2.7 3 .02 9.5 33 .85 85 26 9.3 14 2.1 12 .07 5.0 4 .05 53 4 .57 15 1.9 35 .18 3.0 9 .07 37 6 .60 16 1.9 8 .04 3.4 4 .04 36 35 7.8 17 1.9 41 .21 3.4 22 .83 168 74 74 18 1.6 17 .07 16 81 5.4 103 49 33 19 1.5 59 .24 33 92 176 94 46 22 20 1.2 13 .04 101 52 64 55 4 1.1 21 1.2 21 .07 14 15 .57 39 1 .11 22 1.5 3 .01 13 1 .04 32 1 .09 23 1.6 4 .02 9.9 1 .03 28 2 .15 24 1.7 13 .06 18 1 .05 24 1 .06 25 1.8 3 .01 12 24 4.3 22 1 .06 26 1.9 7 .03 139 58 58 19 1 .05 27 3.0 31 .55 97 41 46 24 1 .06 28 43 19 6.1 109 32 25 18 1 .05 29 4.6 25 .31 148 159 238 31 10 .84 30 2.1 2 .01 543 538 1550 24 1 .06 31 --- --- --- 129 50 34 --- --- TOTAL 120.7 10.30 1486.8 2203.88 2358 1445.66 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 27 1 .07 14 39 3.1 7.4 1 .02 2 17 1 .05 271 190 311 6.9 1 .02 3 16 2 .09 31 23 2.1 6.3 10 .17 4 209 206 335 30 1 .08 7.6 7 .14 5 164 58 59 24 10 .65 8.2 1 .02 6 38 1 .10 15 7 .28 19 13 .67 7 27 19 1.4 12 5 .16 6.2 1 .02 8 21 1 .06 9.8 1 .03 4.4 5 .06 9 19 1 .05 10 5 .14 5.4 11 .16 10 21 2 .11 8.5 1 .02 12 18 .58 11 16 1 .04 7.2 4 .08 7.8 75 1.6 12 15 1 .04 6.8 3 .06 50 36 9.3 13 13 14 .49 8.1 1 .02 23 17 1.3 14 13 5 .18 6.6 2 .04 132 196 214 15 19 115 5.9 5.8 6 .09 19 11 .82 16 14 2 .08 8.6 12 .28 91 76 86 17 12 7 .43 6.4 4 .07 73 110 27 18 42 11 3.2 5.3 1 .01 80 63 19 19 12 1 .03 7.4 1 .02 39 8 .84 20 11 1 .03 12 2 .06 481 315 806 21 10 2 .05 12 3 .10 99 50 16 22 12 1 .03 22 10 .59 37 27 2.7 23 16 96 4.1 15 25 1.0 25 1 .07 24 10 1 .03 11 1 .03 19 2 .10 25 9.4 1 .03 57 54 32 15 7 .28 26 9.7 9 .24 317 146 324 13 4 .14 27 8.2 3 .07 83 17 3.8 11 7 .21 28 14 10 .57 24 7 .45 26 20 1.5 29 93 36 29 15 16 .65 30 49 5.1 30 62 15 5.7 11 8 .24 51 33 3.1 31 17 2 .09 8.6 1 .02 --- --- --- TOTAL 987.3 - - 446.26 1075.1 - - 681.17 1405.2 •••••• •••• 1196.92 YEAR 15945.0 12103.27 RIO FAJARDO BASIN 50072500 RIO FAJARDO BELOW FAJARDO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°19'35", long 65°38'47", 1.2 mi (1.9 km) southwest of Playa de Fajardo, and 0.5 mi (0.8 km) east of Fajardo Plaza. DRAINAGE AREA.--23.4 sq mi (60.6 sq km). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 178 DATE OXYGEN. OXYGEN SPE- DIS- DEMAND, STREAM- CIFIC SOLVED CMEM.' . FLOW, CON- PH TJR - OXYGEN, (PER- ICAL INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH TIME TANEOUS ANCE ARO ATURE ITT SOLVED SATUR- LEVEL) (CFS) (UMMOS) UNITS) (DEG C) (NTU) CMG/L) ATION) CMG/L) COLT- STREP- FORM, TOCOCCI FECAL, FECAL, 0.7 KF AGAR UM-MF (COLS. (COLS. / PER 100 ML) 103 ML) OCT , 1933 11... 1055 27 161 7.2 29.0 2.9 '.0 91 110 K43000 K15000 DEC 7... 1500 35 146 7.4 29.5 25 11.3 144 23 4700 560 FEB , 1934 02... 1555 23 167 7.8 23.5 16 9.7 125 10 300 K73 MAY 8... 1125 3.9 306 7.3 23.) 1.1 7.9 101 16 35000 K1200 JUN 19... 1310 56 123 7.4 29.0 25 3.6 111 <10 K13000 2600 AUG 20... 1150 10 331 7.5 30.0 1.0 9.2 120 <10 570 K50 MARC,- MASNE- SODIUM POTAS- ALKA- CHLO- FLUO MARO- NESS, CALCIUM SIUM, SODIUM, AD - SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- CIS- DIS- DIS- SORP- DIS- FIELD DIS- DIS- OIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MS/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT 1933 11... 40 DEC 7... FES 1984 02... MAY 8... 85 JUN 19... AUG 20... 65 2 9.6 4.3 14 1 1.3 38 5.8 23 .10 31 44 25 24 5.2 25 1 2.0 61 8.2 51 .10 33 9 17 5.3 21 1 1.5 57 7.4 42 .20 SOLIDS. SOLIDS. NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. Cr NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L On- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDEO (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1933 11... 22 100 7.5 4 <.01 <.10 .37 .33 .70 DEC 7... 12 <.01 .30 <.01 (.10 FES , 1934 02... 14 .09 .01 .10 .04 1.8 1.8 1.9 MAY 8... 21 170 1.8 4 .22 .08 .30 .45 .45 .90 1.2 JUN 19... 19 .28 .02 .30 .11 .19 .30 .60 AUG 20... 25 150 4.2 4 (.01 <.10 .05 .35 .40 X = non-ideal count RIO FAJARDO BASIN 50072500 RIO FAJARDO BELOW FAJARDO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV"' NIUM, RECOV"' TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L (MG/L CUG/L CUG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS BA) AS CO) AS CR) AS PB) AS HG) AS SE) AS AG) OCT , 1983 11... .39 2 <100 1 2 1 .1 <1 <1 DEC 7... .04 FES , 1984 02... 3.4 .06 MAY 8... 5.3 .29 1 <100 1 <1 3 .1 <1 <1 JUN 19... 2.7 .08 AUG 20... <.01 179 180 RIO BLANCO BASIN 50075000 RIO ICACOS NEAR NAGUABO, PR LOCATION.--Lat 18°16'38", long 65°47'09", Hydrologic Unit 21010001, in Caribbean National Forest, off Highway 191, at El Yunque, 1.6 mi (2.6 km) upstream from confluence with Rio Cubuy, 2.8 mi (4.5 km) north of Florida, and 5.3 mi (8.5 km) northwest of Naguabo Plaza. DRAINAGE AREA.--1.26 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-crested weir. Altitude of gage is 2,020 ft (616 m), from topographic map. REMARKS.--Records poor. AVERAGE DISCHARGE.--12 years (1946-52, 1980-84), 15.3 cu ft/s (0.433 cu m/s), 164.90 in/yr (4,188 mm/yr), 11,080 acre-ft/yr (13.7 cu hm/yr); median of yearly mean discharges, 14 cu 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 m), from rating curve extended above 30 cu ft/s (0.850 cu m/s) on basis of step-backwater analysis; minimum daily, 1.5 cu ft/s (0.042 cu m/s) Mar. 22, Apr. 10, 1946. EXTREMES FOR CURRENT YEAR.--Peak discharges above base of 650 cu ft/s (18.4 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Aug. 26 1745 *641 18.2 5.26 1.603 Minimum observed discharge, 4.0 cu ft/s (0.113 cu m/s) Apr. 16. DISCHARGE. IN CUBIC FEET PER SECOND, WATER YE AR OCTOBER 1983 TO SEPTEMBER 1 984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 12 7.5 7.0 11 6.5 7.0 4.0 4.5 3.5 12 18 5.8 2 7.2 7.0 75 3.5 6.0 6.5 4.0 4.0 7.5 8.0 35 5.2 3 6.7 10 8.0 5.0 6.5 6.0 4.0 11 6.5 12 11 5.2 4 6.5 60 6.5 3.0 14 6.0 4.0 13 7.4 80 14 5.0 5 6.0 16 5.6 7.5 8.5 6.0 4.0 6.0 6.0 40 16 10 6 6.0 65 35 7.0 9.5 6.0 4.0 7.5 40 9.5 10 6.2 7 7.3 10 8.0 7.0 15 5.5 4.0 4.8 35 3.0 6.0 5.1 8 8.8 3.5 7.0 6.5 7.5 5.5 4.0 5.0 9.0 7.0 5.9 4.8 9 12 8.0 6.5 10 30 9.0 4.0 7.0 17 7.0 5.8 5.5 10 6.9 7.5 7.0 13 55 6.0 4.0 10 23 7.0 5.6 5.5 11 6.1 7.5 20 12 20 6.0 4.0 6.5 12 9.0 5.6 8.2 12 7.8 7.5 6.0 22 17 6.0 4.0 5.5 11 7.5 5.5 13 13 10 7.5 5.1 45 35 9.0 4.0 5.5 14 6.8 5.3 20 14 8.3 7.4 5.4 15 14 12 4.0 5.2 9.0 7.8 5.2 31 15 9.5 7.3 8.9 3.5 40 6.0 4.0 13 7.0 9.0 5.2 8.6 16 6.7 7.0 11 10 30 6.5 4.0 6.5 11 6.5 5.4 53 17 8.5 7.0 13 11 9.0 10 5.2 7.5 17 6.0 5.2 14 18 16 7.0 17 12 9.5 7.0 4.0 6.5 9.8 6.0 4.9 14 19 10 7.0 10 7.5 9.0 5.6 4.0 14 25 5.5 4.8 8.6 20 10 7.0 9.5 9.0 11 5.5 6.5 14 10 5.5 5.4 51 21 8.0 7.0 7.5 6.5 6.9 5.2 5.5 7.0 8.0 6.0 5.1 10 22 7.0 6.5 15 7.5 7.5 5.5 4.5 8.0 7.0 6.0 6.4 7.6 23 6.5 6.0 12 15 6.5 9.5 4.5 7.5 6.5 7.5 5.3 6.8 24 6.9 7.5 8.5 9.5 6.5 9.5 4.0 5.8 6.0 10 4.8 6.4 25 6.5 6.0 7.0 16 6.5 8.0 4.0 6.0 6.0 6.5 20 6.2 26 6.0 6.0 6.5 12 6.5 7.5 4.0 50 6.0 8.5 102 6.0 27 6.0 6.0 10 3.5 7.0 5.0 6.0 50 5.5 6.0 15 7.1 28 6.0 6.0 14 9.5 7.0 4.0 15 22 6.0 8.0 7.8 8.0 29 11 6.0 22 7.5 6.0 4.5 7.0 55 8.0 23 6.3 7.4 30 40 8.5 15 6.9 --- 4.0 4.8 100 13 14 6.5 12 31 20 --- 40 6.5 4.0 --- 12 --- 8.0 6.2 --- TOTAL 296.2 337.2 429.0 341.9 413.4 203.8 143.0 480.3 357.7 363.6 365.2 357.2 MEAN 9.55 11.2 13.8 11.0 14.3 6.57 4.77 15.5 11.9 11.7 11.8 11.9 MAX 40 65 75 45 55 12 15 100 40 80 102 53 MIN 6.0 6.0 5.1 6.0 6.0 4.0 4.0 4.0 5.5 5.5 4.8 4.8 CFSM 7.58 8.89 11.0 8.73 11.3 5.21 3.79 12.3 9.44 9.29 9.37 9.44 IN. 8.74 9.95 12.66 10.09 12.20 6.01 4.22 14.17 10.55 10.73 10.77 10.54 AC-FT 588 669 851 678 820 404 284 953 709 721 724 709 CAL YR 1983 TOTAL 4399.5 MEAN 12.1 MAX 267 MIN 3.2 CFSM 9.60 IN 129.79 AC-FT 8730 MTR YR 1984 TOTAL 4088.5 MEAN 11.2 MAX 102 MIN 4.0 CFSM 8.89 IN 120.61 AC-FT 8110 181 RIO BLANCO BASIN 50075000 RIO ICACOS NEAR NAGUABO, PR--Continued WATER QUALITY RECORDS PERIOD 0= RECORC.--WATER YEARS AUGUST 1951 TO CURRENT YEAR WATER-QUALITY DATA. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMELDW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA:- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMMOS) (DEG C) OCT. C5 1315 5.B 65 22.0 MAR, 21 0945 5.2 115 19.0 NOV. 21 1144 7.1 69 22.0 MAR, 29 1548 4.5 75 20.5 DEC. 11 1043 5.2 45 18.5 MAY. 24 1217 5.9 56 20.5 JAN. 19 1253 7.4 62 20.0 JUL. 13 1205 6.4 60 24.0 FEB. 23 1003 6.5 106 19.0 AUG, 07 1424 5.8 68 20.5 182 RIO BLANCO BASIN 50076000 RIO BLANCO NEAR FLORIDA, PR LOCATION.--Lat 18°13'45", long 65°47'06", Hydrologic Unit 2101005, on left bank of Highway 191, 0.5 mi (0.8 km) upstream from Quebrada Sonadora, 0.7 mi (1.1 km) upstream from intersection of Highway 191 and 31, 0.8 mi (1.3 km) south of Florida. DRAINAGE AREA.--12.3 sq mi (31.9 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1982 to current year. GAGE.--Water-stage recorder. Altitude of gage is 50 ft (15 m), from topographic map. REMARKS.--Records fair. Low flow affected 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) from rating curve extended above 200 cu ft/s (5.664 cu m/s) on basis of step-backwater analysis and slope-area measurement; minimum, 8.8 cu ft/s (0.249 cu m/s) Apr. 10, 1983. EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Nov. 6 0430 4,290 121 16.98 5.176 June 6 2315 3,310 93.7 15.79 4.813 Dec. 2 0800 3,010 85 15.40 4.694 Aug. 26 1800 *5,660 160 18.43 5.617 Minimum discharge, 13 cu ft/s (0.68 cu m/s) Apr. 19, 20. DISCHARGE. IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 61 40 29 43 28 44 15 14 60 48 47 23 2 39 30 303 30 23 30 15 14 46 43 143 22 3 34 51 47 27 27 25 16 15 37 41 32 21 4 31 441 34 29 73 24 16 17 31 212 57 20 5 31 94 35 25 32 23 15 15 27 201 32 43 6 29 636 113 24 55 23 14 15 334 52 23 40 7 37 80 43 23 68 23 15 16 247 41 21 22 8 107 59 38 22 40 26 15 15 72 34 20 20 9 105 52 33 33 141 47 15 19 103 34 19 20 10 44 52 36 68 171 25 15 38 108 37 18 25 11 33 45 53 41 139 24 29 18 142 33 17 40 12 31 42 41 58 107 26 17 20 82 32 18 107 13 59 40 32 138 147 30 15 50 79 30 17 134 14 43 41 29 109 92 53 14 30 54 53 16 184 15 75 39 39 50 205 23 14 24 43 45 17 51 16 43 38 78 82 185 32 14 19 36 30 19 226 17 39 36 78 93 58 74 14 40 82 38 17 123 18 213 35 80 59 42 22 14 41 50 42 16 146 19 75 40 49 44 36 19 14 71 158 24 16 55 20 145 37 54 86 35 17 14 75 67 22 18 393 21 53 33 34 37 32 16 17 24 38 26 16 85 22 58 34 84 39 31 17 15 36 36 27 24 44 23 41 31 47 71 28 36 15 52 34 31 17 34 24 36 29 35 35 28 21 15 61 32 25 16 30 25 44 34 30 83 29 18 14 30 30 22 54 28 26 37 29 28 34 28 18 15 216 29 23 588 28 27 32 29 28 26 36 16 53 157 36 21 121 27 28 29 28 54 27 30 15 115 304 33 22 39 43 29 38 29 54 22 27 16 21 134 100 160 27 27 30 251 45 62 22 --- 16 16 334 50 67 25 29 31 100 --- 139 20 15 --- 86 --- 35 26 --- TOTAL 1993 2249 1839 1500 1973 819 606 2000 2276 1551 1536 2091 MEAN 64.3 75.0 59.3 48.4 68.0 26.4 20.2 64.5 75.9 50.0 49.5 69.7 MAX 251 636 303 138 205 74 115 334 334 212 588 393 MIN 29 28 28 20 23 15 14 14 27 21 16 20 CFSM 5.23 6.10 4.82 3.94 5.53 2.15 1.64 5.24 6.17 4.07 4.02 5.67 IN. 6.03 6.80 5.56 4.54 5.97 2.48 1.83 6.05 6.88 4.69 4.65 6.32 AC-FT 3950 4460 3650 2980 3910 1620 1200 3970 4510 3080 3050 4150 CAL TR 1983 TOTAL 24029.3 MEAN 65.8 MAX 1220 MIN 9.6 CFSM 5.35 IN 72.67 AC-FT 47660 WTR YR 1984 TOTAL 20433.0 MEAN 55.8 MAX 636 MIN 14 CFSM 4.54 IN 61.79 AC-FT 40530 183 RIO BLANCO BASIN 50076000 RIO BLANCO NEAR FLORIDA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--OCTOBER 1982 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1933 TO SEPTEMBER 1984 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 11 1125 31 96 27.0 MAR, 26 1550 17 102 29.0 NOV, 03 1447 35 95 23.5 APR, 10 1039 15 118 25.5 DEC, 12 1359 37 97 26.5 MAY, 23 1158 32 99 26.0 JAN, 11 1050 33 93 23.5 JUN, 18 1329 52 39 34.0 FEB, 14 1244 74 86 24.0 JUL, 25 1234 22 105 28.0 MAR, 06 1434 24 100 26.5 AUG, 17 1010 17 110 27.0 0815 CAJ 0820 ).MAYA 41E4 Z 440Sk Rb0 ) R(0 (iranch bosin 0 Map area- 0827 L\—• 80814.:\----, (-- '.1 0860 091950 3'. ) 0840 * 0851 .;, ‘, a 0950857 at. A 08 31 863 *. 1 s " ",,,,„„/ Drainage haundar 0871 YA 087 ATI LA UAYAMA 05 09452 94510 / EXPLANATION 955 ARROYO 0945 0820 SURFACE-WATER STATION AND NUMBER 0825 LOW-FLOW STATION AND NUMBER M A R CAR/ 8E V0835 QUALITY-OF-WATER STATION AND NUMBER 031 WELL AND WELL NUMBER *(KILOMETERS Figure 19.--Southeastern river basins--Rio Humacao to Rio Seco basins. 186 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 m) 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 current year. GAGE.--Water-stage recorder and concrete control. Datum of gage 33.33 ft (10.16 m) above mean sea level. REMARKS.--Records fair. EXTREMES FOR PERID OF RECORD.--Maximum discharge, 9,940 cu ft/s (282 cu m/s) July 5, 1983, gage height, 15.00 ft (4.572 m) 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 7.9 cu ft/s (0.224 cu m/s) May 1-4, 9, 10, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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) Nov. 5 unknown *3,500 99.1 unknown Minimum discharge, 7.9 cu ft/s (0.224 cu m/s) May 1-4, 9, 10. DISCHARGE, IN CUBIC FEET PER SE:040, WATER YEAR OCTJBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEE MAR ADR MAY JUN JUL AUG SEP 1 2 3 4 5 48 45 40 39 38 39 28 32 370 393 30 23 217 25 51 24 37 24 41 23 19 20 21 21 19 21 13 3.6 19 13 3.9 13 13 12 13 15 11 15 22 11 26 28 17 225 131 27 30 23 28 64 27 67 27 75 32 20 15 15 20 101 6 7 3 9 10 39 32 32 55 32 275 85 67 56 43 43 25 33 24 29 22 29 29 31 45 21 24 21 18 24 20 21 10 23 22 11 23 15 11 22 14 9.3 21 14 8.6 87 60 107 154 91 29 24 24 21 36 23 20 18 18 17 47 20 17 30 23 11 12 13 14 15 26 43 32 26 30 41 39 39 38 37 29 25 30 25 28 43 35 50 31 29 24 28 105 46 152 20 14 11 20 15 14 19 13 15 19 14 14 19 12 13 124 97 57 41 46 26 23 22 31 26 17 17 17 16 17 22 33 232 299 88 16 17 13 19 20 32 26 53 64 30 36 35 34 34 33 28 25 27 25 29 24 27 20 26 51 292 61 40 32 28 19 11 11 19 12 11 13 11 10 17 9.8 9.8 17 15 14 66 71 38 31 28 23 20 21 24 25 21 18 18 19 19 106 143 139 114 191 21 22 23 24 25 26 25 23 21 21 32 33 33 31 31 27 23 26 27 28 24 26 21 27 33 27 26 24 25 21 16 14 16 15 16 18 15 13 38 15 13 45 15 11 20 28 26 26 25 23 48 35 37 29 23 19 20 18 17 16 131 69 45 44 41 25 27 28 29 30 31 69 26 23 32 37 45 29 31 29 29 30 28 22 31 20 28 22 23 20 36 19 49 19 21 23 23 19 --- 14 10 36 14 12 30 14 15 60 14 11 50 13 9.4 210 13 --- 73 22 21 23 29 29 --- 23 24 37 74 55 23 168 95 27 24 22 23 36 37 35 30 37 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 1120 36.1 69 21 2.09 2.41 2220 2064 63.8 390 28 3.98 4.44 4090 1160 941 37.4 27.1 217 51 23 19 2.16 1.57 2.49 1.81 2300 1670 1225 42.2 292 18 2.44 2.63 2430 549 413.2 320.2 17.7 13.8 26.5 23 22 210 13 9.4 8.6 1.02 .80 1.53 1.18 .89 1.76 1090 820 1630 1827 60.9 225 17 3.52 3.93 3620 960 31.0 74 20 1.79 2.06 1900 952 30.7 168 16 1.78 2.05 1890 2180 72.7 299 15 4.20 4.69 4320 CAL YR 1983 WTR YR 1984 TOTAL TOTAL 19458.0 14111.4 MEAN 53.3 MEAN 38.6 MAX MAX 1760 390 MIN 10 MIN 8.6 CFSM 3.08 CFSM 2.23 IN 41.84 IN 30.34 AC-FT AC-FT 38590 27990 187 RIO HUMACAO BASIN 50082000 RIO HUMACAO AT HIGHWAY 3 AT HUMACAO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°08'49", long 65°49'37", at bridge on Highway 3, 300 ft (91 m) downstream from Quebrada Mariana, and 0.4 mi (0.6 km) south of Humacao plaza. DRAINAGE AREA. - -17.3 sq mi (44.8 sq km). PERIOD OF RECORD. - -Water years 1958-66, 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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- OUCT- (STAND- TEMPER- ato- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARO ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMMOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT • 1983 05... 1150 36 254 7.6 29.0 33 2.? 107 13 22000 32000 DEC 09... 1045 27 266 7.4 24.5 17 8.6 103 20 K11000 K4500 MAR 16... 0940 19 264 7.8 25.5 25 3.1 99 10 310000 70000 APR 25... 1120 15 272 7.8 29.5 34 9.6 126 12 K7200 2900 JUN 27... 1135 22 266 7.4 31.5 37 7.9 135 24 85000 21000 AUG 10... 1130 16 286 7.4 24.0 '.2 5.7 86 <10 K633000 58000 HARD- MAGNE- SO)IUM POTAS"' ALKA- CHL0- FLUD- HARD- NESS, CALCIUM SLUM, SODIUM. k0- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- OIS- DIS- S0qP- DIS- FIELD DIS- OIS- DIS'" (MG/L 80NATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED DATE AS CAC03) (MG/L CAC03) (MG/L AS CA) (MG/L AS MG) (MG/L AS NA) RATIO (MG/L AS () AS CAC03) (MG/L AS SO4) (MG/L AS CL) (MG/L AS F) OCT • 1983 05... 72 0 19 6.0 24 1 1.7 77 9.4 23 .20 DEC 09... 32 MAR 16... 84 APR 25... 80 0 22 6.1 23 1 1.7 34 15 23 .20 JUN 27... 85 AUG 10... 89 0 24 7.1 24 1 1.9 92 14 23 .20 SOLIDS, SOLIDS, NITRO"' SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- D/S- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVE) DEG. C, NITRATE NITRITE 402+403 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT • 1983 05... 40 170 16 8 .77 .03 .80 .23 .27 .50 1.3 DEC 09... 40 .73 .02 .80 .13 <.10 MAR 16... 47 .57 .03 .60 1.00 .30 1.3 1.9 APR 25... 37 190 7.4 34 .57 .03 .60 .16 2.E 3.0 3.6 JUN 27... 68 .58 .02 .60 .50 .50 1.0 1.6 AUG 10... 41 200 8.4 105 .65 .05 .70 .39 1.9 2.3 3.0 K = non-ideal count 188 RIO HUMACAO BASIN 50082000 RIO HUMACAO AT HIGHWAY 3 AT HUMACAO, PR - -Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 C4R0- BARIUM, CADMIUM MTUM, LEAD, MERCURY SILVER, NITRO- PNOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV­ TOTAL TOTAL TOTAL ERA3LE ERABLE ERABLE ERABLE ERA3LE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS 3A) AS CO) AS CR) AS P3) AS HG) AS SE) AS AG) OCT r 1983 05... 5.3 .18 5 10) 1 11 4 <.1 <1 <1 DEC 9... .17 MAR 16... 3.4 .34 APR 25... 16 .33 1 10) 1 5 4 .1 <1 <1 JUN 27... 7.1 .29 AUG 10... 13 .27 -- 1889 RIO GUAYANES BASIN 50083500 RIO GUAYANES AT YABUCOA, PR WATER-QUALITY RECORDS 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 1983 TO SEPTEMBER 1984 OXYGEN• OXYGEN COLI- STREP- SPE- DIS- DEMAND• FORM• TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL. FECAL• FLOM• CON- PH TOR- OXYGEN. (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- 310- MS- CENT (HIGH UM-44F (COLS. TIME TANEOUS ANCE ARD ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT • 1933 19... 1245 70 104 7.0 26.5 65 7.0 37 43 46000 40000 DEC 21... 1335 33 160 7.2 25.0 24 3.0 97 <10 2000 K1200 MAR • 1984 16... 1515 29 153 7.6 26.0 11 3.4 104 <10 500 650 APR 27... 1350 18 165 7.4 27.0 7.6 5.6 108 <10 K800 520 JUL 04... 1210 33 151 7.2 26.0 15 7.6 94 30 K3000 K3000 AUG 30... 1145 25 157 7.2 27.0 3.9 7.7 96 17 K1400 500 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS• CALCIUM SLUM• SODIUM• AO- SIUM• LINITY SULFATE RIDE, RIDE• NESS NONCAR- DIS- DIS- DIS- SORP- DIS- FIELD DIS- DIS- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) AS CL) AS F) OCT • 1983 19... 27 0 6.8 2.5 9.6 .8 1.7 30 8.9 8.0 .20 DEC 21... 54 MAR • 1934 16... 57 APR 27... 43 0 12 4.3 15 1 1.2 62 3.5 12 .20 JUL 04... 52 AUG 30... 44 0 11 4.0 13 .9 1.3 54 4.0 13 .10 SOLIDS• SOLIDS• NITRO.'" SILICA, SUM OF SOLIDS• RESIDUE NITRO- NITRO- NITRO- NITRO- GEN,AW. DIS CONSTI- DIS- AT 105 GEN• GEN• GEN• GEN• MONIA + NITRO- SOLVED TUENTS• SOLVED DEG. C. NITRITE N0241403 AMMONIA ORGANIC ORGANIC GEN• (IMG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENOED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SIM (RG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) OCT • 1983 19... 23 79 15 126 <.01 .40 .06 .54 .60 1.0 DEC 21... 12 <.01 .40 .02 .48 .50 .90 MAR • 1984 16... 10 <.01 .30 <.01 <.10 APR 27... 37 120 5.9 8 <.01 .20 .02 .08 .10 .30 JUL .30 04... 25 <.01 .10 <.01 .20 AUG 30... 35 110 7.7 5 <.01 .20 .04 .26 .30 .50 K = non-idool count 190 RIO GUAYANES BASIN 50083500 RIO GUAYANES AT YABUCOA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO­ BARIUM. CADMIUM MIUM, LEAD. MERCURY SILVER. NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV­ TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (KM (MG/L (UG/L (UG/L (UG/L (UM (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS BA) AS CD) AS CR) AS PB) AS MG) AS SE) AS AG) OCT , 1983 19... 4.4 .20 1 <100 <1 4 3 <.1 <1 <1 DEC 21... 4.0 .05 MAR . 1984 16... .02 APR 27... 1.3 .06 1 <100 1 1 1 .3 <1 <1 JUL 04... 1.3 .05 AUG 30... 2.2 .03 CHLOR- DI- PCB. ALDRIN. DANE. DOD, DOE. DOT, AZINON. TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL , 1984 04... 1210 <.1 <.01 <.1 <.01 <.01 <.01 <.01 HEPTA- METH DI- ENDO- HEPTA- CHLOR MALA- OXY- ELDRIN SULFAN, ENDRIN. ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR. TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (U5/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL , 1984 04... <.01 <.01 (.01 <.01 <.01 <.01 <.01 <.01 <.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION. THION. MIREX, THION. CMLOR. THANE APHENE. TRI­ TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL . 1984 04... <.01 <.01 <.01 <.01 <.10 <.1 <1 <.01 RIO GUAYANES BASIN 50086500 RIO GUAYANES ABOVE MOUTH AT PLAYA DE GUAYANES, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°03'45", long 65°49'42", at old railroad crossing, 0.2 mi (0.3 km) from mouth, 0.4 mi (0.6 km) west of Playa de Guayangs, and 3.5 mi (5.6 km) northeast of Yabucoa Plaza. DRAINAGE AREA.--34.0 sq mi (88.1 sq km). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE STREAM- FLOM, INSTAN TIME TANECUS (CFS) SPE- CIFIC CON- DUCT- ANCE CUMMOS) PH (STAND- ARD UNITS) TEMPER- ATURE (DEG C) TjR- SID- /TY (NTU) OXYGEN, DIS- SOLVED (MG/L) OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) OXYGEN DEMAND. CHEM- ICAL (HIGH LEVEL) (MG/L) COLI- STREP- FORM, TOCOCCI FECAL, FECAL. 0.7 KF AGAR UM-MF (COLS. (COLS./ DER 100 ML) 100 ML) OCT , 1983 19... 1005 179 109 7.1 25.0 85 7.6 92 55 40000 100000 DEC 21... 1540 69 183 7.4 27.0 15 8.2 132 <10 2500 780 MAR , 1934 16... 1225 43 195 8.0 26.0 15 3.9 109 <10 K960 510 APR 27... 1125 27 192 7.6 29.0 ?.6 8.5 112 <10 K950 380 JUL 04... 1440 57 158 7.6 29.0 15 7.8 101 15 K800 480 AUG 30... 1405 39 175 7.5 32.0 15 6.5 39 27 2000 250 HARO- NESS (MG/L AS DATE CAC03) HARD- NESS, NONCAR- BONATE (MG/L CAC03) CALCIUM DIS- SOLVED (MG/L AS CA) MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) SODIUM, DIS- SOLVED CMG/L AS NA) SODIUM AO- SORP- TION RATIO POTAS- ALKA- SIUM, LINITY DIS- FIELD SOLVED (MG/L (MG/L AS AS K) CAC03) SULFATE DIS- SOLVED (MG/L AS 504) CHLO- FLUO- RIDE; RIDE. DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS CL) AS F) OCT . 1933 19... 23 DEC 21... MAR , 1934 16... APR 27... 53 JUL 04... AUG 30... 48 0 6.9 2.5 10 .9 1.3 29 9.9 10 .10 59 67 0 13 4.4 18 1 1.6 69 5.8 16 .20 55 0 12 4.4 17 1 1.9 61 6.0 18 .10 SOLIDS. SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM-• DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C. NITRATE NITRITE NO2+1403 AMMONIA ORGANIC ORGANIC GEN, (4G/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDE0 (MG/L OWL (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MS/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1933 19... 21 80 33 386 <.01 .40 .06 1.0 1.1 1.5 DEC 21... 8 .57 .03 .60 .10 .20 .30 .90 MAR , 1984 16... -- .... 17 <.01 .40 <.01 .10 .50 APR 27... 37 140 10 11 <.01 .10 <.01 .40 .50 JUL 04... 34 <.01 .20 <.01 .40 .60 AUG 30... 34 130 14 50 <.01 .20 .05 .45 .50 .70 K = non-ideal count 191 192 RIO GUAYANES BASIN 50086500 RIO GUAYANES ABOVE MOUTH AT PLAYA DE GUAYANES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PHDS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN., PHORUS, ARSFNIC RECDV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERA3LE ERABLE ERA3LE ERABLE ERABLE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L (US/L (UG/L (UG/L (UG/L (UG/L (UG/L GATE AS NO3) AS p) AS AS) AS BA) AS CO) AS CR) AS P3) AS MG) AS SE) AS AG) OCT , 1983 19... 6.6 .10 1 100 <1 3 4 <.1 <1 <1 DEC 21... 4.0 .07 MAR , 1914 16... 2.2 .04 APR 27... 2.2 .09 1 <100 1 1 <1 .5 <1 <1 JUL 04... 2.7 .05 AUG 30... 3.1 .03 193 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 sq mi (13.93 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February 1971 to current year. GAGE.--Water-stage recorder. Altitude of gage is 230 ft (70.1 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--13 years (1972-84), 18.4 cu ft/s (0.521 cu m/s), 46.44 in/yr (1,180 mm/yr), 13,330 acre-ft/yr (16.4 cu 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 cu m/s) Aug. 31, 1979, gage height, 14.57 ft (4.441 m), from rating curve extended above 50 cu ft/s (1.42 cu m/s) on basis of step-backwater analysis; minimum daily, 2.2 cu ft/s (0.062 cu m/s) Jul. 16, Aug. 7, 13, 1974. EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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) (n) Oct. 8 2145 618 17.5 6.77 2.063 June 10 0500 642 18.2 6.84 2.085 Dec. 2 0800 696 19.7 6.99 2.130 Sept. 19 1930 678 19.2 6.94 2.115 Feb. 15 2100 *883 25.0 7.47 2.277 Minimum daily discharge, 3.8 cu ft/s (0.108 cu m/s) May 18, 19. DISCHARGE. IN CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 29 32 12 13 7.3 3.9 5.8 5.5 24 7.3 14 5.8 2 24 15 89 9.4 7.0 8.5 6.5 6.5 11 6.8 15 5.4 3 21 18 16 3.5 7.2 8.2 6.7 6.1 8.0 6.4 8.2 5.5 4 21 225 14 8.4 7.8 7.9 6.6 4.6 10 12 15 6.3 5 19 73 13 8.2 7.1 7.9 9.6 4.1 7.3 57 9.3 9.2 6 19 76 13 8.0 12 7.5 7.4 4.2 7.8 10 7.3 8.5 7 18 29 12 7.5 9.4 8.3 7.1 5.6 8.7 8.1 6.8 6.3 8 58 24 11 7.2 7.4 7.7 6.4 5.2 8.2 7.3 6.4 5.8 9 40 21 11 7.8 7.5 7.8 5.9 6.7 7.1 6.7 6.2 8.9 10 19 19 11 15 7.4 7.2 5.9 6.1 66 7.6 5.8 17 11 16 18 11 7.6 7.3 7.5 5.9 4.7 77 6.4 5.7 14 12 16 17 11 - 7.6 30 8.2 5.4 4.2 30 6.2 5.7 25 13 16 16 9.9 25 26 7.6 5.2 8.8 23 5.9 5.6 79 14 15 15 9.6 29 14 8.5 5.2 5.6 14 15 5.4 46 15 15 14 12 13 118 7.3 5.0 4.4 11 12 5.5 28 16 14 15 11 18 113 9.3 5.4 4.0 11 6.8 7.6 28 17 13 14 11 15 26 9.6 5.7 4.1 15 6.3 5.5 79 18 37 14 9.9 12 18 7.9 6.3 3.8 10 6.1 5.2 98 19 32 14 9.7 9.6 15 6.9 6.9 3.8 9.5 5.7 5.1 120 20 22 13 9.1 17 14 6.6 5.8 4.2 9.2 5.7 6.5 101 21 24 13 9.0 10 13 6.6 5.3 4.0 8.9 8.1 5.3 35 22 24 13 9.3 12 12 6.0 4.6 4.9 8.3 6.5 5.3 25 23 18 13 9.6 11 11 8.7 5.0 6.9 8.1 6.2 5.1 21 24 17 12 9.0 9.3 11 7.2 5.1 4.5 8.3 5.7 5.0 19 25 17 12 8.5 11 9.9 6.4 5.3 4.7 8.3 5.5 5.8 18 26 18 11 9.4 9.1 9.6 6.2 5.6 7.2 8.6 5.4 30 18 27 15 12 15 8.6 10 6.0 5.5 7.1 8.3 5.3 16 18 28 15 12 12 9.6 9.3 5.9 5.7 18 7.6 6.1 7.4 28 29 14 11 11 8.3 9.1 6.4 5.5 8.6 7.4 35 6.2 28 30 13 13 10 7.8 --- 6.0 5.3 59 8.7 16 5.8 19 31 13 M.. 21 7.4 5.7 --- 17 --- 9.5 5.7 --- TOTAL 652 804 430.0 350.9 556.3 230.4 177.6 244.1 450.3 314.6 249.4 925.7 MEAN 21.0 26.8 13.9 11.3 19.2 7.43 5.92 7.87 15.0 10.1 8.05 30.9 MAX 58 225 89 29 118 9.6 9.6 59 77 57 30 120 MIN 13 11 8.5 7.2 7.0 5.7 4.6 3.8 7.1 5.3 5.0 5.4 CFSM 3:90 4.98 2.58 2.10 3.57 1.38 1.10 1.46 2.79 1.88 1.50 5.74 IN. 4.51 5.56 2.97 2.43 3.85 1.59 1.23 1.69 3.11 2.17 1.72 6.40 AC-FT 1290 1590 853 696 1100 457 352 484 893 624 495 1840 CAL Ti 1983 TOTAL 6835.2 MAN 18.7 MAX 225 MIN 2.6 CFSM 3.48 IN 47.25 AC-FT 13560 VTR TM 1984 TOTAL 5385.3 MEAN 14.7 MAX 225 MI* 3.8 CFSM 2.73 IN 37.23 AC-FT 10680 194 RIO MAUNABO BASIN 50090500 RIO MAUNABO AT LIZAS, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEAR AUGUST 1981 TO CURRENT YE4R WATER-QUALITY OATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOW. SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA.. DATE TIME INSTANTANEOUS DUCTA4CE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMMOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 12 1340 15 179 28.0 MAR, 27 1244 6.3 133 28.0 NOV, 16 1500 14 197 27.0 APR, 12 1235 5.6 188 26.5 OEC, 13 1100 10 200 24.0 MAY, 21 1615 4.3 185 27.0 JAN, 17 1058 20 153 24.0 JUN, 14 1107 14 157 27.0 FEB, 15 1105 39 130 22.5 AUG, 16 1432 6.2 161 30.0 MAR, 12 1333 7.2 144 26.0 RIO MAUNABO BASIN 50091000 RIO MAUNABO AT MAUNABO, PR 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 from mouth. DRAINAGE AREA.--12.4 sq mi (32.1 sq km). PERIOD OF RECORD.--Water years 1958-66, 1975 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN. OXYGEN COLI- STREP- SPE- On- DEMAND. FORM. TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL. FLOW. CON- PH TjR- OXYGEN. (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND.. TEMPER- 310- On- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARO ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) CMG/L) ATION) (MG/L) 100 ML) 100 ML) OCT • 1983 20... 1025 26 207 7.5 27.3 13 7.4 93 <10 5500 5.300 DEC 21... 1150 14 236 7.6 27.5 32 9.0 114 <10 600 310 MAR • 1984 19... 1115 11 234 7.9 26.5 4.0 9.2 114 <10 K190 K1100 APR 30... 1420 6.2 238 7.8 29.5 4.9 9.4 123 <10 K720 K1000 JUL 06... 1310 17 193 7.4 30.0 7.1 7.5 99 <10 3000 610 AUG 29... 1315 9.2 213 7.5 31.0 2.5 3.3 109 11 K1100 450 HARD- NESS (MG/L AS DATE CAC03) HARD- NESS. NONCAR- OONATE (MG/L CAC03) CALCIUM DIS- SOLVED (MG/L AS CA) MAINE- STUMP DIS- SOLVED (MG/L AS MG) SODIUM. DIS- SOLVED (MG/L AS NA) SODIUM POTAS- ALKA- CHLO- FLUO- 40* STUN. LINITY SULFATE RIDE. RIDE, SORP- OIS- FIELD DIS- DIS- BIS- TION SOLVED (MG/L SOLVED SOLVED SOLVED RATIO (MG/L AS (MG/L (MG/L (MG/L AS K) CAC03) AS SO4) AS CL) AS F) OCT • 1993 20... 65 DEC 21... MAR • 1984 19... APR 30... 77 JUL 06... AUG 29... 65 0 16 0 18 0 15 5.2 18 1 1.2 70 9.7 16 .20 82 83 7.9 22 1 .90 87 12 19 .20 62 6.6 18 1 1.0 72 9.4 19 .10 SOLIDS, SOLIDS, NITRO." SILICA, SUM OF SOLIDS. RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO GEN,AM- DIS- CONSTI- OIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+403 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 20... 34 140 10 34 .37 .03 .40 .02 .78 .30 1.2 DEC 21... 8 <.01 .30 <.01 14 14 MAR • 1984 19... 6 <.01 .20 .12 .48 .60 .80 APR 30... 39 170 2.9 6 <.01 .20 <.01 .50 .70 JUL 06... 15 <.01 .30 <.01 .20 .50 AUG 29... 35 150 3.7 6 <.01 .10 .03 .17 .20 .30 K = non-ideal tount 195 196 RIO MAUNABO BASIN 50091000 RIO MAUNABO AT MAUNABO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE NITRO- GEN, TOTAL (MG/L AS NO3) CHRO- 3ARIUM, CADMIUM MIUM, LEAD, MERCURY P40S- TOTAL TOTAL TOTAL TOTAL TOTAL SELE - PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, TOTAL TOTAL ERA3LE ERABLE ERA3LE ERABLE ERABLE TOTAL (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS P) AS AS) AS 3A) AS CO) AS CR) AS PS) AS MG) AS SE) SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) OCT ' 1983 20... 5.3 DEC 21... 63 MAR , 1984 19... 3.5 APR 30... 3.1 JUL 06... 2.2 AUG 29... 1.3 .08 .06 .12 .35 .11 .04 1 1 <100 <100 1 1 3 1 3 5 (.1 (.1 <1 <1 <1 <1 197 RIO CHICO BASIN 50091800 RIO CHICO AT PROVIDENCIA, PR WATER-QUALITY RECORDS LOCATION.--Lat 17°59'16", long 66°00'18", at flat low bridge 200 ft (61 m) south of Highway 3, 0.5 mi (0.8 km) above mouth, and 1.5 mi (2.4 km) southeast of Patillas plaza. DRAINAGE AREA.--4.9 sq mi (12.8 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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. TIME TANEOUS ANCE ARC ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT r 1983 20... 1230 4.9 414 7.6 28.0 2.3 4.8 61 26 5700 9100 DEC 21... 1000 1.6 637 7.4 25.5 7.3 1.0 12 48 2400000 51000 MAR . 1984 19... 0945 .65 667 7.5 25.0 7.9 .0 0 150 4200000 870000 APR 30... 1145 .50 722 7.3 29.0 8.4 .0 0 170 K6.6 E07 410000 JUL 06... 1040 6.7 374 7.5 26.0 6.6 6.4 79 18 300000 52000 AUG 29... 1045 .47 874 7.2 29.0 1.5 .0 0 140 4500000 K1700000 HARD­ MAGNE­ SODIUM P3TAS- ALKA- CHLO- FLUO­ HARD- NESS, CALCIUM SIUM, SODIUM, AD­ SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR­ DIS­ DIS­ DIS­ SORP On- FIELD DIS- DIS- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) AS CL) AS F) OCT p 1983 20... 110 0 26 12 44 2 1.9 142 23 32 .20 DEC 21... 207 MAR r 1984 19... 216 APR 30... 130 0 30 13 70 3 7.7 223 49 61 .10 JUL 06... - 114 AUG 29... 150 0 35 14 110 4 6.9 216 75 96 .30 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO"- NITRO- NITRO- GEN,AM- DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN. GEN, GEN' MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. Cr NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENOED (MGM. (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SIO2) CMG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT r 1983 20... 31 260 3.4 5 .28 .02 .30 2.0 1.7 3.7 4.0 DEC 21... 9 .30 .80 1.1 5.9 5.1 11 12 MAR , 1984 19... 9 .04 <.10 17 5.0 22 APR 30... 35 400 .52 10 .05 .05 .10 21 14 35 35 JUL 06... 10 .35 .25 .60 1.7 1.7 3.4 4.0 AUG 29... 37 500 .61 66 .02 <.10 16 5.0 21 K = non-idsal count 6.6 EDT = 66,000,000 198 RIO CHICO BASIN 50091800 RIO CHICO AT PROVIDENCIA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS. ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV­ TOTAL TOTAL TOTAL ERASLE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L CUG/L (UG/L DATE AS NO3) AS P) AS AS) AS IA) AS CD) AS CR) AS PB) AS HG) AS SE) AS AG) OCT , 1983 20... 13 .59 1 <100 1 23 1 <.1 <1 1 DEC 21... 54 .18 MAR . 1984 19... 4.9 APR 30... 160 5.2 1 100 1 7 3 .6 <1 2 JUL 06... 13 .52 AUG 29... 4.3 199 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) up­ stream from Lago Patillas Dam and 2.2 mi (3.5 km) northwest of Patillas. DRAINAGE.--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. Altitude of gage is 235 ft (71.6 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--18 years (1967-84), 59.9 cu ft/s (1.696 cu m/s), 44.45 in/yr (1,129 mm/yr), 43,400 acre-ft/yr (53.5 cu hm/yr); median of yearly mean discharges, 56 cu ft/s (1.59 cu m/s), 40,600 acre-ft/yr (50 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, 4.6 cu ft/s (0.130 cu m/s) May 13-16, 1968, gage height, 3.55 ft (1.082 m). EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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 m/s) (ft) (m) Nov. 5 1930 5,930 168 11.09 3.380 June 10 0615 3,970 112 9.75 2.972 Feb. 15 2100 *6,230 176 11.27 3.435 Sept. 17 1445 4,750 134 10.32 3.146 Minimum discharge, 8.2 cu ft/s (0.232 cu m/s) May 4, 5. DISCHARGE, IN CUBIC FEET PER SECOND• WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 60 27 27 39 20 26 13 12 37 31 36 28 2 49 26 76 30 20 26 13 11 28 25 34 26 3 44 32 30 23 21 26 13 11 22 16 30 22 4 41 394 25 23 32 24 13 10 24 145 45 23 5 38 425 22 23 26 23 15 9.0 22 448 42 31 6 34 179 23 30 26 23 16 10 51 67 32 36 7 35 94 23 28 25 23 15 11 88 45 32 24 8 41 65 22 23 21 23 13 9.8 48 37 30 21 9 56 51 21 28 20 24 13 11 35 33 30 21 10 41 43 20 34 23 23 14 13 504 31 29 41 11 36 41 21 26 23 20 17 11 72 33 27 45 12 37 38 20 25 84 19 17 9.6 53 32 26 62 13 60 35 19 85 112 19 16 11 55 34 25 71 14 47 33 18 144 60 33 15 11 37 68 25 77 15 44 34 21 85 436 23 14 11 27 59 26 68 16 41 33 24 71 252 21 15 11 25 47 32 78 17 34 31 21 76 74 21 15 10 31 41 26 512 18 37 30 24 62 61 19 14 10 23 38 23 465 19 43 29 20 53 52 18 13 12 20 34 23 358 20 35 28 20 76 44 19 14 11 20 34 25 485 21 33 27 21 62 38 21 14 12 19 35 22 330 22 32 27 23 59 36 21 14 15 16 37 22 125 23 30 27 24 43 34 28 13 20 14 36 22 94 24 29 27 24 41 33 20 12 15 14 33 21 72 25 29 26 23 40 31 16 12 19 15 31 20 63 26 31 26 22 35 29 15 11 38 15 33 44 54 27 27 27 29 32 29 14 14 40 14 33 55 49 28 26 26 26 30 29 14 17 33 12 30 32 50 29 38 26 23 27 27 14 12 25 13 57 27 47 30 34 28 32 25 --- 14 12 141 16 60 30 47 31 30 --- 50 23 13 --- 46 --- 39 37 --- TOTAL 1192 1935 794 1426 1718 643 419 619.4 1370 1722 930 3425 MEAN 38.5 64.5 25.6 46.0 59.2 20.7 14.0 20.0 45.7 55.5 30.0 114 MAX 60 425 76 144 436 33 17 141 504 448 55 512 MIN 26 26 18 23 20 13 11 9.0 12 16 20 21 CFSM 2.10 3.53 1.40 2.51 3.24 1.13 .77 1.09 2.50 3.03 1.64 6.23 IN. 2.42 3.93 1.61 2.90 3.49 1.31 .85 1.26 2.78 3.50 1.89 6.96 AC-FT 2360 3840 1570 2830 3410 1280 831 1230 2720 3420 1840 6790 CAL YR 1983 TOTAL 21535.0 MEAN 59.0 MAX 1030 MIN 10 CFSM 3.22 IN 43.77 AC-FT 42710 WTR YR 1984 TOTAL 16193.4 MEAN 44.2 MAX 512 MIN 9.0 CFSM 2.42 IN 32.92 AC-FT 32120 RIO GRANDE DE PATILLAS BASIN 50092000 RIO GRANDE DE PATILLAS NEAR PATILLAS, PR--Continued (National stream-quality accounting network station) WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1960 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE STREAM- FLOW, INSTAN- TIME TANEOUS (CFS) SPE- CIFIC CON- DUCT- ANCE (UMHOS) PM (STAND- ARD UNITS) TEMPER- ATURE (DEG C) BID- ITT (NTU) OXYGEN, COLI- STREP- DIS- FORM. TOCOCCI SOLVED FECAL, FECAL, HARD- OXYGEN, (PER- 0.7 KF AGAR NESS DIS- CENT UM-MF (COLS. (MG/L SOLVED SATUR- (COLS./ PER AS (MG/L) ATION) 100 ML) 100 ML) CAC03) OCT , 1983 5... 1140 36 164 8.1 25.5 1.1 8.2 102 450 690 43 FEB • 1934 01... 1400 19 157 7.8 23.5 1.0 9.0 107 K860 K1800 52 JUN 6... 1300 48 89 7.3 26.5 33 8.4 105 2300 K15000 23 AUG 03... 1230 30 134 7.7 27.0 1.6 8.3 131 K910 K1200 40 HARD- MAGNE- SODIUM POTAS-. ALKA.- CHLO- FLUO- SILICA. NESS, CALCIUM STUN, SODIUM, AD- SION, LINITY SULFATE RIDE, RIDE. DIS- NONCAR- DIS- DIS- DIS- SORP- NS- FIELD On- DIS- DIS- SOLVED BONATE SOLVED SOLVED SOLVE) TION SOLVED (MG/L SOLVED SOLVED SOLVED (MG/L (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L AS DATE CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS SO4) AS CL) AS F) SI02) OCT • 1983 06... 0 11 5.0 13 .8 .40 51 9.3 11 .10 26 FEB e 1984 01... 0 12 5.4 14 .9 .40 53 11 11 <.10 23 JUN 06... 2 5.2 2.4 7.7 .7 .40 21 7.3 8.6 (.10 12 AUG 03... 0 9.4 4.1 11 .8 .40 41 9.8 10 (.10 21 SOLIDS. SOLIDS, NITRO- NITRO- NITRO- NITRO- PHOS- RESIDUE SUM OF SOLIDS, GEN, GEN, GEN, GIN,AM- PHOS- PHORUS, AT 180 CONSTI- On- NO2+NO3 AMMONIA AMMONIA MONIA + PHOS- PHCRUS• ORTHO. DEG. C TUENTSe SOLVED DIS- DIS- DIS- ORGANIC PHORUS, DIS- DIS- DIS- DIS- (TONS SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED SOLVED SOLVED SOLVED PER (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE (MG/L) (MG/L) DAY) AS N) AS N) AS NH4) AS N) AS P) AS P) AS P) OCT , 1983 06... 102 110 9.9 .12 .03 .04 .4 .02 .02 .01 FEB • 1984 01... 117 110 6.0 <.10 <.01 1.0 <.01 <.01 <.01 JUN 06... 63 57 8.2 (.10 .03 .04 .3 .08 .05 .04 AUG 03... 99 90 7.8 <.10 .02 .03 .2 .02 (.01 .01 PHOS- PHATE, ALUM- BERYL- CHRO- ORTHO• INUM, A-RSENIC BARIUM, LIUM, CADMIUM MIUM, COBALT, COPPER• IRON. DIS- DIS- DIS- DIS- DIS- MS- On- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS PO4) AS AL) AS AS) AS BA) AS BE) AS CD) AS CR) AS CO) AS CU) AS FE) OCT . 1983 06... .03 10 1 21 <.5 <1 <1 <3 1 36 FEB . 1984 01... 20 <1 24 <.5 <1 <1 <3 1 19 JUN 06... .12 50 1 11 <.0 <1 <1 <3 3 100 AUG 03... .03 10 1 13 1 <1 3 <3 <1 42 K = non-ideal count 200 201 RIO GRANDE DE PATILLAS BASIN 50092000 RIO GRANDE DE PATILLAS NEAR PATILLAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MANGA- MOLY8- SELE- STRON- VANA- LEAD, LITHIUM NESE' MERCURY DENUMr NICKEL, NIUM, SILVER. TIUM, DIUM, DIS- DIS- DIS- DIS- DIS- DIS- DIS- ors- ors- 3IS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS P3) AS LI) AS MN) AS MG) AS MO) AS NI) AS SE) AS AG) AS SR) AS V) OCT r 1983 06... 1 <4 9 .1 (10 2 <1 <1 37 7 FEB r 1984 01... 1 <4 32 <.1 <10 1 <1 <1 44 <6 JUN 06... 2 <4 6 .2 <10 3 <1 <1 19 <6 AUG 03... <1 <4 5 <.1 <10 <1 <1 <1 33 <6 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (3EG C) (CFS) (UMHOS) (DEG C) NOV' 16 1131 34 163 25.5 MAR, 27 1520 14 163 28.0 DEC, 05 1235 22 175 25.0 APR, 11 1044 17 161 25.5 JAN, 20 1103 90 120 23.0 MAY, 14 1234 11 163 27.0 MAR, 21 1155 21 158 25.5 SED. SUSP. STREAM- SEDI- SIEVE FLOW, MENT, DIAM. INSTAN- SUS- I FINER TIME TANEOUS PENDED THAN DATE (CFS) (MG/L) .062 MM OCT r 1933 06... 1140 36 7 36 FE8 r 1934 01... 1400 19 7 100 JUN 06... 1300 48 40 100 AUG 03... 1230 30 72 100 AISONITO s NCAYEY , a rivoyabal Dr otir/ogo oundar LAN DIAZ fb eVdMad1( Rio S.co bag6, 88 1120 087 103 102 0 GUAVAMA 1070 8 12 046ANTA ISA EL. CENTRAL 146'?145 se • 1 AGLHRRE )111- 146 1 bTahlii M A R CA R 1 BE , —t` CPLAN A ON A1007 LOW-FLOW STATION AND NUMBER FA00700. V1065 QUALITY-OF-WATER STATION AND NUMBER M YACTUEZ CASUA 01 WELL AND WELL NUMBER AUAT4t. e KiLOME T E RS area 1 6 M/LES Figure 20.--South coast river basins--Rio Salinas to Rio Jacaguas basins. 204 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 1.75 mi (2.8 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 to September, 1984. GAGE.--Water-stage recorder. Altitude of gage is 260 ft (79.0 m), from topographic map. REMARKS.--Records fair. Diversion to Coamo water treatment plant, for municipal supply, upstream from station. Some diurnal fluctuation from return flow from Coamo sewage treatment plant. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 22,000 cu ft/s (623 cu m/s) Oct. 9, 1970, gage height, 21.4 ft (6.523 m), from floodmark, on basis of contracted-opening measurement of peak flow; minimum, 1.3 cu ft/s (0.037 cu m/s) Apr. 10, 11, 1968. EXTREMES FOR CURRENT PERIOD.--Peak discharges above base of 1,000 cu ft/s (28.3 cu m/s) and maximum (*): Date Time Discharge (cu ft/s) (cu m/s) Gage height (ft) (m) Date Time Discharge (cu ft/s) (cu m/s) Gage height (ft) (m) Sept. 2 Sept. 18 1715 2000 *1,790 1,450 50.7 41.1 5.66 5.24 1.725 1.597 Sept. 20 Sept. 28 1500 1530 1,460 1,420 41.3 40.2 5.26 5.21 1.603 1.588 Minimum discharge, 2.4 cu ft/s (0.068 cu m/s) Aug. 24, 26. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 4.6 4.2 4.2 4.3 4.0 7.5 6.6 5.8 5.2 4.9 4.2 4.2 4.1 4.1 4.4 5.2 9.0 5.7 5.2 7.1 4.2 4.2 4.2 4.3 46 4.7 4.4 4.1 4.5 4.7 18 118 31 33 33 6 7 8 9 10 4.0 4.0 4.1 4.4 4.7 4.9 4.3 4.1 4.1 4.3 4.2 4.2 4.0 4.2 4.2 14 9.7 9.6 7.7 9.8 18 9.5 6.8 5.9 5.5 4.5 4.4 4.3 4.0 3.9 23 9.1 6.3 5.5 5.2 11 12 13 14 15 4.4 4.4 3.8 4.0 4.0 4.6 4.2 4.0 3.8 3.6 4.4 4.4 5.4 4.9 10 7.6 6.0 5.2 4.9 4.1 5.3 4.9 4.7 5.3 4.9 4.1 4.4 4.4 4.1 22 21 25 23 15 11 16 17 18 19 20 4.0 4.1 3.9 3.9 4.0 4.1 3.5 3.4 3.2 3.5 5.7 5.5 4.9 4.9 5.1 4.2 4.3 4.4 5.5 6.4 4.8 4.5 4.6 4.4 4.1 5.2 3.6 3.5 3.5 3.3 23 28 159 185 509 21 22 23 24 25 _-_ 5.5 5.3 3.9 5.3 5.6 4.4 4.0 3.5 3.4 3.5 3.5 3.4 4.9 4.7 4.6 4.4 4.5 5.3 14 7.2 5.4 5.1 4.2 4.2 4.0 3.8 3.7 3.0 3.0 2.8 2.8 2.9 226 78 44 33 25 26 27 28 29 30 31 5.1 4.9 4.6 4.8 --- 4.5 4.6 4.7 5.3 5.1 7.1 5.2 11 9.1 5.5 4.6 --- 4.2 4.0 4.1 4.0 5.5 7.0 4.3 4.3 4.5 4.4 4.3 --- 3.9 4.0 4.3 4.0 4.0 4.3 7.1 7.0 3.4 3.3 3.4 22 22 20 100 39 22 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT --- --- 137.2 4.43 7.1 3.8 .10 .11 272 142.3 4.74 11 3.2 .10 .12 282 148.9 4.80 10 4.0 .10 .12 295 194.4 6.48 14 4.1 .14 .16 386 200.5 6.47 46 3.7 .14 .16 398 162.3 5.24 22 2.8 .11 .13 322 1890.1 63.0 509 5.2 1.37 1.53 3750 205 RIO COAMO BASIN 50106500 RIO COAMO NEAR COAMO, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1978 to current year. WATER-QUALITY RECORDS, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN. OXYGEN CCLI- STREP- SPE- 015- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM-.. FECAL, FECAL, FLOW, CON- PM TJR- 3XYGEN, (PER- ICAL 0. 7 KF AGAR INSTAN- DUCT- (STAND- TENDER- 310- 015- CENT (HIGH UM-Me (COLS. TIME TANEOUS ANCE ARD ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMMOS) UNITS) COED C) CNTU) CMG/L) ATION) (MG/L) 100 ML) 103 ML) OCT , 1933 17... 1200 15 485 8.0 23.0 13 6.6 35 15 K10000 K16000 DEC 12... 1155 11 562 5.1 26.3 ?.1 7.4 92 10 300 400 MAR , 1934 02... 1655 4.1 699 8.3 31.0 1.3 3.6 117 10 K140 300 APR 27... 1500 8.7 637 5.1 23.5 7.3 5.3 32 19 K3400 4200 JUN 25... 1405 5.4 554 8.2 32.0 2.4 8.2 113 25 K670 273 AUG 21... 1615 2.9 731 3.0 32.5 .60 5.5 77 30 K15000 750 HARD- MAGNE­ SODIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS. CALCIUM SIUM, SODIUM. AD­ SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS­ DIS­ OIS­ SORP­ CIS- FIELD DIS- '!IS- DIS- (MG/L SONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT , 1983 17... 190 9 50 15 26 .9 3.0 178 27 30 .20 DEC 12... 248 MAR , 1934 02... 257 APR 27... 23J 0 58 20 41 1 4.5 232 39 49 .20 JUN 25... 226 AUG 21... 263 0 68 21 42 1 3.9 271 29 50 .20 SOLIDS, SOLIDS, NITRO- SILICA. SUM OF SOLIDS. RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN. MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. Cr NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN. (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENOE3 (MG/L (MG/L (MG/L CMG/L (MG/t (MG/L (MGIL DATE SI02) (MG/L) OAT) {M;/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 17... 28 290 12 19 1.8 .03 1.9 .70 .70 1.4 3.3 DEC 12... 12 2.8 .26 3.1 .66 .34 1.0 4.1 MAR r 1984 02... 6 3.2 .48 3.7 .82 .58 1.4 5.1 APR 27... 29 3E0 9.2 2 1.7 .39 2.1 1.3 1.1 2.4 4.5 JUN 25... 6 2.2 .19 2.4 .31 1.4 1.7 4.1 AUG 21... 32 410 3.2 8 1.8 .33 2.1 1.5 .40 1.9 4.0 K = non-ideal count 206 RIO COAMO BASIN 50106500 RIO COAMO NEAR COAMO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- 3ARIJM, CADMIUM MIUMP LEAD, MERCURY SILVER, NITRO- AMOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELF- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV­ TOTAL TOTAL TOTAL E1A9LE ERASLE ERA3LE ERABLE ERABLE TOTAL ERAALE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NC3) AS P) AS AS) AS 8A) AS CD) AS CR) AS PS) AS HG) AS SE) AS AG) OCT , 1983 17... 15 .55 1 cm) 1 3 1 <.1 <1 2 DEC 12... 18 .32 -- PAR , 1984 02... 23 1.' APR 27... 20 .42 2 <130 1 2 2 .3 <1 <1 JUN 25... 19 .3e AUG 21... 13 1.2 STREAMFLOWP SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMMOS) (DEG C) (CFS) (UMMOS) (DEG C) NOV, 16 1005 29 560 25.5 MAT, 16 1052 5.6 651 23.5 APR, 05 0924 4.9 397 24.5 JUN, 11 1 028 7.5 557 29.0 207 RIO DESCALABRADO BASIN 50108000 RIO DESCALABRADO NEAR LOS LLANOS, PR LOCATION.--Lat 18°03'08", long 66°25'34", Hydrologic Unit 21010004, at bridge on Highway 14, 1.5 mi (2.4 km) west of Los Llanos, 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. Altitude of gage is 220 ft (67.0 m), from topographic map. REMARKS.--Records fair. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 7,000 cu ft/s (198 cu m/s) May 21, 1969, gage height 11.5 ft (3.505 m), from rating curve extended above 250 cu ft/s (7.080 cu m/s) on basis of slope-area measurements of peak flow; no flow many days. EXTREMES FOR CURRENT PERIOD.--Peak discharges above base of 700 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) Aug. 31 1445 781 22.1 6.16 1.878 Sept. 18 1945 1,560 44.2 7.64 2.329 Sept. 10 1815 *2,220 62.9 8.68 2.646 Sept. 20 0500 2,110 59.8 8.52 2.188 Sept. 12 1530 757 21.4 6.11 1.862 Sept. 28 1545 1,300 36.8 7.18 2.188 Minimum discharge, 0.24 cu ft/s (0.007 cu m/s) Mar. 12-15, Apr. 18, 19, 23, 24. DISCHARGE. IN CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .37 .41 .58 .54 .48 .36 4.9 2 .36 .37 .58 1.0 .48 .36 39 3 .32 .36 .57 .55 .48 .36 6.1 4 .31 .36 .57 .51 .49 .38 1.6 5 .32 .39 .58 .50 8.2 .36 13 5 .31 .38 .61 .52 .72 .36 5.4 7 .31 .38 .63 .54 .53 .38 1.9 8 .31 .37 .62 .52 .52 .37 1.3 9 .34 .35 .58 .48 .53 .36 1.2 10 .35 .37 .58 7.8 .57 .35 79 11 .32 .39 .56 .73 .57 .36 20 12 .30 .37 .58 .55 .53 .40 40 13 .23 .39 .95 .51 .52 .35 4.5 14 .28 .37 .66 .48 .54 .35 3.1 15 .29 .32 3.9 .47 .55 .36 2.1 16 --- .32 .32 1.2 .46 .53 .35 25 17 .58 .36 .31 .52 .51 .54 .34 37 18 .61 .33 .29 .49 .53 2.5 .33 127 19 .57 .35 .28 .48 .51 .60 .32 32 20 .54 .37 .30 .48 .49 .51 .32 226 21 .53 .41 .31 .52 .48 .52 .31 40 22 .46 .36 .30 .55 .48 .57 .30 20 23 .43 .39 .28 .52 .47 .52 .31 10 24 .42 .39 .28 4.5 .46 .46 .30 8.0 25 .41 .40 .30 .73 .45 .41 .32 6.5 26 .40 .41 4.4 1.1 .44 .41 .37 5.5 27 .40 .39 1.2 .60 .43 .42 .37 5.0 28 .40 .37 .65 .67 .44 .41 .36 50 29 .38 .41 .56 .59 .48 .41 .36 10 30 --- .44 .56 .71 .48 .37 .45 5.0 31 .44 --- .59 --- .35 53 --- TOTAL 10.91 15.92 26.80 22.81 25.24 63.57 330.1 MEAN .35 .53 .86 .76 .81 2.05 27.7 MAX .44 4.4 4.5 7.8 8.2 53 226 MIN .28 .28 .48 .43 .35 .30 1.2 CFSM .03 .04 .07 .06 .06 .16 2.15 IN. --- .03 .05 .08 .07 .07 .18 2.39 AC-FT 22 32 53 45 50 126 1650 WATER QUALITY RECORDS PERIOD OF RECORDS.--APRIL TO SEPTEMBER 1984 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) APR, 15 1137 .40 808 26.0 JUN. 11 1222 .71 557 30.0 MAY, 16 1240 .73 528 27.0 AUG, 01 0855 .37 933 25.0 208 RIO JACAGUAS BASIN 50111500 RIO JACAGUAS AT JUANA DIAZ, PR LOCATION.--Lat 18°03'16", long 66°30'40", Hydrologic Unit 21010004, on Highway 14 bridge, 0.4 mi (0.6 km) west of Juana Diaz plaza, and 4.0 mi (6.4 km) downstream from Lago Guayabal. DRAINAGE AREA.--49.8 sq mi (129.0 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March to September 1984. GAGE.--Water-stage recorder. Altitude of gage is 131 ft (40.0 m), from topographic map. REMARKS.--Records fair. Flow regulation from Lago Guayabal. EXTREMES FOR CURRENT PERIOD.--Peak discharges above base of 300 cu ft/s (8.50 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) Sept. 20 0630 342 9.68 8.06 2.457 Sept. 21 1830 *357 10.1 8.09 2.466 Minimum discharge, 0.91 cu ft/s (0.026 cu m/s) May 14, 15, July 16, 17. DISCHARGE, IN CUBIC FEET PER SECOND' WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 6.3 4.9 4.1 2.2 2.2 7.4 2 5.9 5.0 5.1 1.9 2.2 5.5 3 5.6 5.0 3.1 1.8 2.2 5.1 4 5.3 5.3 2.1 1.8 3.4 4.4 5 5.3 4.2 1.5 5.5 5.2 10 6 5.3 2.9 1.3 4.4 5.6 7.3 7 5.4 2.6 1.6 3.8 6.7 6.1 8 5.3 2.2 1.6 3.0 7.4 6.2 9 4.3 1.9 1.7 2.2 7.7 5.7 10 2.9 1.8 6.0 2.3 8.2 5.2 11 3.3 1.7 3.2 3.1 8.3 5.3 12 4.9 1.5 2.7 3.0 8.5 5.2 13 --- 5.1 1.7 2.4 2.6 7.4 5.5 14 4.9 4.9 1.9 2.4 2.6 6.2 5.9 15 5.2 4.3 1.7 2.3 2.6 6.2 5.0 16 5.2 4.6 2.1 2.2 2.4 7.1 4.9 17 6.0 4.3 2.1 2.4 1.5 6.2 5.0 18 5.5 4.3 1.2 2.5 1.9 5.9 17 19 5.5 3.6 1.5 2.3 3.0 5.8 28 20 5.7 2.8 1.4 2.2 3.6 5.9 68 21 5.8 2.4 1.3 2.2 4.2 6.6 216 22 6.0 2.5 1.5 2.3 4.5 6.4 196 23 5.9 2.3 1.6 2.8 4.4 7.0 122 24 7.0 2.1 1.8 3.5 4.7 7.0 83 25 6.8 3.1 4.8 3.4 4.9 6.9 73 26 5.9 6.0 4.0 3.3 4.9 6.6 66 27 5.1 8.2 5.6 3.2 4.9 6.7 65 28 4.8 5.6 2.6 2.8 3.5 5.8 85 29 5.7 4.7 2.3 2.8 3.1 5.3 103 30 5.7 4.8 2.6 2.6 2.8 6.2 77 31 5.7 --- 2.8 --- 2.4 13 --- TOTAL 135.4 83.2 81.6 99.5 195.8 1300.7 MEAN 4.51 2.68 2.72 3.21 6.32 43.4 MAX 8.2 5.6 6.0 5.5 13 218 MIN 2.1 1.2 1.3 1.5 2.2 4.4 CFSM .09 .05 .06 .06 .13 .87 IN. .10 .06 .06 .07 .15 .97 AC-FT 269 165 162 197 388 2580 WATER QUALITY RECORDS PERIOD OF RECORD.--APRIL TO SEPTEM3ER 1934 WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLO, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (C'S) (UMHOS) (DEG C) APR, 05 1507 MAY, 22 1047 5.5 1.6 357 357 29.5 29.0 JUN, 12 1035 AUG, 01 1140 2.8 2.2 374 345 28.0 30.0 R(0 Grande de monad aosin Rio Grand* da Aretiao oir: Drainage boursdary,, Ur i YEae Rib 6, 0,1be ae A6bsco basin rage boundary., \ Logo CS Ccho Ftke: cionnojibo eosin of AM,. SABANA GRANDE PENUELA \ JUANA 126(1 3'0 MAZ Auvo Loco *Logo Bronco GU AN€1..LA 122.a- ...., .._ . 5c, 127-, .... 1220 8obsia /1 d& 6aayanilla ,,---- --". 1295 /-' 119 —12 0 do r47tiaboci i PLAYA 1297 WI 'PONCE t, te(., — GUANiCA ENSENADA k \vi EXPLANATION A1125 SURFACE-WATER STATION AND NUMBER M A R C A RI BE A1159 CREST-STAGE GAGING STATION A1220 LOW-FLOW STATION AND NUMBER V1140 QUALITY-OF-WATER STATION AND NUMBER 5:;;;3ZETE3. . A'...c.;, s. , ,+!..t.T • 74 WELL AND WELL NUMBER ',.....4 c". FAJARCIC) -\ ike&Y/21 V E X CAM) 01, -,-;3' PoCk ., , t...:„_„,..,..,_,,, @,:sAisk,L 4 ... 0 KR.OMETERE I—Map area EM/:.ES Figure 21.--South coast river basins--Rio InabOn to Rio Loco basins. 210 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 mi (0.6 km) upstream from 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. Altitude of gage is 410 ft (125 m), from topographic map. Prior to April 1971 nonrecording gage and crest- stage gage at different datum. REMARKS.--Records fair. AVERAGE DISCHARGE.--18 years (1965-69, 1972-84), 18.4 cu ft/s (0.521 cu m/s), 25.76 in/yr (654 mm/yr), 13,330 acre-ft/yr (16.4 cu hm/yr); median of yearly mean discharges, 17 cu ft/s (0.48 cu m/s), 12,300 acre-ft/yr (15 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 5,720 cu ft/s (162 cu m/s) Oct. 9, 1970, gage height, 20.6 ft (6.279 m), datum then in use, from 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, 0.80 cu ft/s (0.023 cu m/s) July 23, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges above base of 500 cu ft/s (14.2 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. 11 1700 *786 22.3 9.05 2.758 Nov. 7 1530 727 20.6 8.55 2.606 Oct. 22 1600 690 19.5 8.23 2.509 July 18 1615 622 17.6 7.64 2.329 Nov. 5 2000 686 19.4 8.20 2.499 Sept. 2 1545 739 20.9 8.65 2.637 Minimum daily discharge, 2.1 cu ft/s (0.059 cu m/s) Mar. 10, Apr. 9, May 9. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 3.9 11 14 7.1 5.0 3.0 2.7 2.7 20 7.0 7.1 14 2 2.5 9.1 13 5.4 4.8 3.2 2.3 2.7 28 7.4 7.6 80 3 4.2 14 11 5.2 4.1 3.5 2.4 2.6 17 7.4 6.3 55 4 10 116 8.9 6.2 6.4 4.2 7.4 2.8 11 10 6.0 29 5 11 107 8.1 9.2 7.2 4.2 5.8 3.3 30 54 6.3 26 6 4.8 84 8.0 3.2 5.7 3.2 3.4 2.9 27 16 6.1 28 7 3.6 123 7.4 9.3 5.8 2.8 2.5 2.6 17 9.6 5.4 19 8 32 95 7.2 26 7.1 2.6 2.2 2.4 17 7.7 5.2 13 9 23 63 7.3 20 11 3.5 2.1 2.1 12 7.3 4.7 9.9 10 46 54 7.6 9.5 8.9 2.1 2.5 2.4 20 6.8 4.3 22 11 96 46 8.3 6.4 8.7 2.2 24 2.7 20 7.8 4.1 18 12 62 36 7.6 5.2 7.0 2.3 5.5 2.5 18 6.8 4.7 27 13 34 28 6.9 4.8 6.1 2.4 2.7 5.4 12 5.9 6.3 48 14 24 25 6.7 5.4 5.3 2.4 33 5.0 8.7 6.8 4.3 37 15 23 21 6.8 4.3 4.9 2.7 15 14 6.4 9.0 10 24 16 49 19 6.8 4.1 5.9 3.0 5.5 21 22 6.0 11 18 17 61 18 6.6 4.0 4.5 8.1 4.2 4.2 33 5.3 5.9 47 18 45 16 6.8 3.5 3.8 3.8 4.0 3.3 35 40 4.7 104 19 29 16 5.8 3.2 3.4 3.0 3.7 3.1 24 24 4.1 99 20 31 17 25 3.0 3.0 15 3.5 2.8 17 12 4.0 129 21 56 17 23 2.6 3.0 9.5 3.3 18 11 8.6 3.7 84 22 98 16 10 2.5 2.8 3.7 3.3 36 8.8 7.6 3.2 61 23 59 15 8.6 2.6 2.7 5.1 2.6 19 6.7 6.7 3.5 38 24 36 14 8.0 2.5 2.8 4.8 2.5 40 8.3 6.7 3.2 30 25 27 14 7.4 3.1 3.5 4.1 2.9 30 9.9 5.8 3.2 26 26 22 12 8.3 3.8 4.0 4.4 10 20 7.7 6.6 20 22 27 18 12 10 3.6 3.5 3.9 12 10 7.3 6.3 15 23 28 15 11 7.3 3.9 3.5 3.6 4.0 32 6.8 17 6.0 25 29 23 10 7.3 4.1 3.2 3.6 2.9 24 6.7 13 4.5 21 30 19 14 7.3 4.9 --- 3.1 2.9 25 6.8 8.5 9.0 21 31 14 --- 7.3 5.2 2.5 --- 20 --- 7.5 14 --- TOTAL 982.0 1053.1 284.3 188.8 147.6 125.5 180.8 364.5 475.1 351.1 203.4 1197.9 MEAN 31.7 35.1 9.17 6.09 5.09 4.05 6.03 11.8 15.8 11.3 6.56 39.9 MAX 98 123 25 26 11 15 33 40 35 54 20 129 MIN 2.5 9.1 5.8 2.5 2.7 2.1 2.1 2.1 6.4 5.3 3.2 9.9 CFSM 3.27 3.62 .95 .63 .53 .42 .62 1.22 1.63 1.17 .68 4.11 IN. 3.77 4.04 1.09 .72 .57 .48 .69 1.40 1.82 1.35 .78 4.59 AC-FT 1950 2090 564 374 293 249 359 723 942 696 403 2380 CAL YR 1983 TOTAL 5385.7 MEAN 14.8 MAX 126 MIN 1.4 CFSM 1.53 IN 20.65 AC-FT 10680 WTR YR 1984 TOTAL 5554.1 MEAN 15.2 MAX 129 MIN 2.1 CFSM 1.57 IN 21.30 AC-FT 11020 RIO INABON BASIN 50112500 RIO INABON AT REAL ABAJO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1931 TO CURRENT YEAR WATER-QUALITY DATA. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOW, SPECI.IC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMMOS) (DEG C) OCT. 25 0945 28 221 24.0 FEB, 24 1206 3.0 276 23.0 NOV, 28 0850 12 302 22.0 MAR, 22 0918 3.9 255 23.0 DEC. 28 1143 7.4 268 24.5 APR, 27 1010 11.0 242 24.5 JAN. 26 1237 4.5 260 24.0 JUL, 30 1205 8.8 258 28.0 211 212 RIO BUCANA BASIN 50114000 RIO CERRILLOS NEAR PONCE, PR LOCATION.--Lat 18°04'15", long 66°34'51", Hydrologic Unit 21010004, on right bank off Highway 139, 2.3 mi (3.7 km) upstream from Quebrada Ausubo and 4.6 mi (7.4 km) northeast of Plaza Degetau in Ponce. 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 current year. GAGE.--Water-stage recorder. Datum of gage is 253.10 ft (77.145 m) above mean sea level, datum of 1929. Prior to Mar 22, 1977, at site 0.15 mi (0.24 km) upstream and datum 9.90 ft (3.018 m) higher. REMARKS.--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, 2.2 cu ft/s (0.062 cu m/s) May 28, 1967. EXTREMES FOR CURRENT YEAR.--Peak discharges above base of 1,200 cu ft/s (34.0 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Sept. 18 2115 *865 24.5 7.15 2.179 Minimum discharge, 4.0 cu ft/s (0.113 cu m/s) May 9,10. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 13 23 26 9.2 6.2 6.7 6.5 5.0 18 7.2 11 26 2 11 22 25 8.7 6.2 6.9 6.3 4.9 24 6.9 10 80 3 13 29 21 8.7 6.7 6.7 6.0 4.8 16 6.7 9.2 48 4 18 141 17 9.0 9.0 6.6 11 4.8 14 13 14 30 5 20 92 15 13 11 6.5 13 4.8 14 82 22 23 6 14 90 55 9.7 7.4 6.5 6.5 4.8 19 26 11 32 7 14 101 13 11 8.2 6.4 5.9 4.7 14 14 9.2 15 8 33 96 13 27 7.6 6.1 5.4 4.4 18 10 8.7 15 9 31 66 13 25 26 6.9 5.1 4.2 12 9.4 8.4 10 10 52 56 13 12 23 6.9 5.2 4.1 29 8.9 8.0 10 11 69 48 15 10 15 6.3 15 4.6 21 8.8 7.6 18 12 74 43 14 9.5 13 6.2 7.7 4.7 18 8.7 9.7 40 13 48 37 13 9.3 11 5.9 6.1 7.8 13 7.7 14 67 14 39 34 14 9.7 11 5.8 13 9.2 11 9.1 9.1 59 15 33 33 15 9.7 9.4 5.8 11 7.8 9.2 12 20 46 16 60 30 13 8.5 11 5.8 6.3 25 9.0 8.0 20 46 17 77 29 13 8.0 9.0 9.7 5.8 7.3 18 8.0 11 124 18 55 37 14 8.3 8.2 6.4 5.5 5.9 64 40 9.3 221 19 44 28 12 8.1 7.7 5.9 5.3 5.6 44 46 8.8 203 20 35 26 16 8.D 7.4 5.6 5.1 5.5 32 31 9.0 211 21 49 25 29 7.8 7.3 6.1 5.0 22 21 16 8.1 150 22 99 24 19 7.8 7.1 5.7 5.5 57 17 17 7.8 120 23 92 23 13 7.6 7.1 14 5.2 35 13 12 7.8 88 24 52 22 11 7.6 7.0 7.1 5.0 48 15 9.6 7.6 71 25 39 21 11 7.6 6.9 5.9 5.3 33 19 8.4 7.4 67 26 33 23 10 7.2 6.9 5.8 10 34 9.0 7.6 41 55 27 28 23 13 7.0 6.8 6.1 12 17 12 7.5 35 80 28 25 21 11 6.7 6.9 5.6 7.0 42 9.2 35 14 93 29 36 19 9.7 6.7 6.8 6.1 5.8 39 8.2 27 9.9 80 30 31 26 9.7 6.4 --- 6.4 5.3 26 7.7 15 18 75 31 25 --- 9.4 6.4 5.9 --- 23 --- 12 24 --- TOTAL 1262 1288 495.8 301.2 276.8 204.3 217.8 505.9 548.3 530.5 410.6 2203 MEAN 40.7 42.9 16.0 9.72 9.54 6.59 7.26 16.3 18.3 17.1 13.2 73.4 MAX 99 141 55 27 26 14 15 57 64 82 41 221 MIN 11 19 9.4 6.4 6.2 5.6 5.0 4.1 7.7 6.7 7.4 10 CFSM 2.29 2.41 .90 .55 .54 .37 .41 .92 1.03 .96 .74 4.12 IN. 2.64 2.69 1.04 .63 .58 .43 .46 1.06 1.15 1.11 .86 4.60 AC-FT 2500 2550 983 597 549 405 432 1000 1090 1050 814 4370 CAL TR 1983 TOTAL 9688.4 MEAN 26.5 MAX 206 MIN 6.5 CFSM 1.49 IN 20.25 AC-FT 19220 WTR YR 1984 TOTAL 8244.2 MEAN 22.5 MAX 221 MIN 4.1 CFSM 1.26 IN 17.23 AC-FT 16350 RIO BUCANA BASIN 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 1983 TO SEPTEMBER 1984 DATE TIME STREAM- FLOW, INSTAN- TANEOUS (CFS) SPE- CIFIC CON- DUCT- ANCE (UMHOS) PH (STAND- ARD UNITS) TEMPER- ATURE (DEG C) TjR- BID- ITY (NTU) OXYGEN, OXYGEN COLI- STREP- DIS- DEMAND, FORM, TOCOCCI SOLVED CHEM- FECAL, FECAL, OXYGEN, (PER- ICAL 0.7 KF AGAR On- CENT (HIGH UM-MF (COLS. SOLVED SATUR- LEVEL) (COLS./ PER (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1933 17... 1515 44 252 8.3 22.0 7.3 7.9 92 26 2200 4600 DEC 12... 1520 14 273 3.7 27.0 1.6 3.6 109 13 K110 K82 MAR r 1934 02... 1340 6.8 232 9.1 23.0 1.5 10.5 135 <10 40 64 APR 25... 1855 18 244 8.4 26.0 263 d.4 105 <10 4600 12000 JUN 26... 1330 8.0 251 8.9 30.0 12 9.3 124 12 300 180 AUG 22... 1300 7.8 270 8.8 32.0 3.5 3.4 116 47 230 350 HARD- NESS (MG/L AS DATE CACO3) HARD- NESS, NONCAR- BONATE (MG/L CAC03) CALCIUM DIS- SOLVED (MGR. AS CA) MAGNE- SIUM, 015- SOLVED (MG/L AS MG) SODIUM. DIS- SOLVED (MG/L AS NA) SODIUM AO- SORP- TION RATIO POTAS- ALKA- CHLO- FLUO- SIUM, LINITY SULFATE RIDE, RIDE, On- FIELD DIS- DIS- DIS- SOLVED (MG/L SOLVED SOLVED SOLVED (MG/L AS (MG/L (MG/L (MG/L AS K) CAC03) AS SO4) AS CL) AS F) OCT . 1983 17... 110 5 33 5.8 9.1 .4 1.1 101 15 6.7 .10 DEC 12... 116 MAR s 1984 02... -- 95 APR 26... 97 0 31 4.3 10 .5 1.4 119 22 8.0 .10 JUN 26... 102 AUG 22... 100 0 32 5.7 11 .5 1.1 105 22 7.7 .10 SOLIDS, SOLIDS, NITRO.* SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO... GENrAM- DIS- CONSTI- DIS- AT 105 GEN, GEN. GEN, GEN, GEN. MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. Co NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDEO (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE 5IO2) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT . 1983 17... 22 150 18 16 .88 .02 .90 .06 .24 .30 1.2 DEC 12... 5 .28 .02 .30 .05 .15 .20 .50 MAR , 1984 02... 5 <.01 <.10 .14 .46 .60 APR 26... 18 170 32 546 .57 .03 .60 .01 1.6 1.6 2.2 JUM 26... 20 <.01 <.10 .07 .53 .60 AUG 22... 21 160 4.9 98 <.01 <.10 .02 .38 .40 K = non-ideal count 213 214 RIO BUCANA BASIN 50114000 RIO CERRILLOS NEAR PONCE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHR1- 3ARIU%, CADMIUM MIUM, LEAD. MERCURY SILVER. NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM. RECOV­ TOTAL TOTAL TOTAL ER41LE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L (MG/L (UG/L (jG/L (US/L (UG/L CUG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS 3A) AS CD) AS CR) AS P3) AS HG) AS SE) AS AG) OCT r 1983 17... 5.3 .36 1 <100 1 4 2 <.1 <1 <1 DEC 12... 2.2 .05 MAR , 1984 02... .07 APR 26... 9.7 .34 1 293 2 2 e .1 <1 <1 JUN 26... .07 AUG 22... .92 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (OEG C) (CFS) (UMHOS) (DEG C) NOV, 03 0910 20 269 24.0 MAY. 15 1045 7.0 278 27.5 JAN. 19 1053 8.1 276 23.0 215 RIO PORTUGUES BASIN 50115000 RIO PORTUGUES NEAR PONCE, PR LOCATION.--Lat 18°04'45", long 66°38'01", Hydrologic Unit 21010004, on right bank 30 ft 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. Altitude of gage is 470 ft (143 m), from topographic map. Prior to Dec. 4, 1964, non-recording gage at same site and datum. REMARKS.--Records fair. Some low-flow regulation due to unknown activity upstream. AVERAGE DISCHARGE.--20 years (1965-84), 18.0 cu ft/s (0.510 cu m/s), 27.71 in/yr (704 mm/yr), 13,040 acre-ft/yr (16.1 cu hm/yr); median of yearly mean discharges, 17 cu ft/s (0.48 cu m/s), 12,300 acre-ft/yr (15 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 flood- marks at downstream side of bridge, from rating curve extended above 150 cu ft/s (4.25 cu m/s) on basis of slope-area measurement of peak flow; minimum, 1.0 cu ft/s (0.028 cu m/s) May 29, 1973. EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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) Sept. 17 1530 *1,940 54.9 8.03 2.448 Sept. 18 2130 1,510 42.8 7.20 2.194 Minimum discharge, 1.0 cu ft/s (0.028 cu m/s) Apr. 29, May 8. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 5.6 12 9.1 10 3.6 3.4 3.1 1.7 6.7 2.5 4.2 11 2 5.0 10 8.0 10 3.6 3.0 3.1 2.0 5.6 2.5 2.4 22 3 5.0 14 7.2 9.1 4.8 3.4 3.1 1.6 3.3 2.4 2.4 16 4 8.5 180 6.5 6.7 4.0 3.6 9.7 1.8 5.2 11 4.4 8.1 5 11 75 6.3 7.3 4.6 3.5 8.8 1.7 27 50 5.2 9.5 6 5.6 96 6.3 6.3 5.2 3.7 5.2 1.5 20 16 3.6 13 7 5.0 82 6.1 6.8 4.8 3.2 4.2 1.4 9.1 8.1 3.1 6.0 8 5.0 45 6.0 23 4.5 2.9 3.2 1.2 6.9 4.5 2.6 4.3 9 8.5 30 5.8 17 9.1 2.9 3.0 1.3 5.8 4.4 2.8 3.1 10 24 22 5.8 9.6 68 2.5 2.9 1.4 22 4.6 2.0 3.9 11 22 18 5.9 8.2 16 2.7 11 1.5 13 3.5 2.0 3.0 12 64 17 5.6 3.5 12 2.3 3.9 1.9 8.7 3.1 2.2 11 13 30 15 5.8 6.4 9.0 3.0 2.8 7.1 6.0 3.4 2.4 14 14 13 14 8.5 6.5 8.0 2.9 8.8 6.1 5.2 8.1 2.2 12 15 9.4 13 8.4 3.5 7.1 2.8 4.7 3.7 4.7 6.4 2.6 53 16 27 13 6.0 6.8 6.7 2.8 3.5 4.9 4.5 4.0 3.4 20 17 66 14 6.7 7.0 6.3 3.0 3.3 2.1 4.9 6.4 2.4 221 18 34 13 7.2 6.3 6.3 2.6 3.2 1.9 11 6.9 2.4 319 19 22 11 6.2 5.5 6.3 2.6 3.0 1.7 13 49 3.6 152 20 14 11 5.7 4.7 5.9 2.6 2.9 1.6 13 17 3.6 250 21 25 11 33 4.7 5.5 2.7 2.8 7.5 6.2 7.7 3.6 103 22 95 10 11 4.1 4.8 2.7 2.8 27 4.8 5.9 3.1 52 23 55 9.3 5.7 3.9 4.5 4.9 2.7 15 3.6 4.2 3.1 28 24 24 8.5 5.9 3.4 4.2 5.5 2.6 36 3.5 3.4 2.2 17 25 15 7.8 5.7 3.3 3.9 2.8 2.8 19 3.1 2.0 17 18 26 13 7.0 6.2 3.2 3.6 3.1 5.1 11 3.1 2.0 18 10 27 12 6.7 6.5 3.1 3.4 2.8 6.9 11 4.2 2.2 16 69 28 11 6.7 6.5 3.3 3.1 2.6 3.2 39 4.7 50 12 47 29 25 6.5 7.4 3.0 3.1 2.6 2.2 21 3.2 9.0 10 31 30 31 16 12 8.6 --- 8.1 8.2 3.4 3.6 --- 2.8 2.9 1.9 --- 12 8.5 2.4 --- 3.6 3.6 15 12 45 --- TOTAL 687.6 787.1 237.3 213.2 231.9 95.6 126.4 255.1 234.4 307.7 171.5 1576.9 MEAN 22.2 26.2 7.65 6.88 8.00 3.08 4.21 8.23 7.81 9.93 5.53 52.6 MAX 95 180 33 23 68 5.5 11 39 27 50 18 319 MIN 5.0 6.5 5.6 3.0 3.1 2.6 1.9 1.2 2.4 2.0 2.0 3.0 CFSM 2.52 2.97 .87 .78 .91 .35 .48 .93 .89 1.13 .63 5.96 IN. 2.90 3.32 1.00 .90 .98 .40 .53 1.08 .99 1.30 .72 6.65 AC-FT 1360 1560 471 423 460 190 251 506 465 610 340 3130 CAL YR 1983 TOTAL 6307.2 MEAN 17.3 MAX 298 MIN 3.4 CFSM 1.96 IN 26.60 AC-FT 12510 WTR YR 1984 TOTAL 4924.7 MEAN 13.5 MAX 319 MIN 1.2 CFSM 1.53 IN 20.77 AC-FT 9770 216 RIO PORTUGUES BASIN 50115000 RIO PORTUGUES NEAR PONCE, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1964 to current year. OXYGEN, OXYGEN cur- SIRED­ SPE­ DIS- DEMAND, FORM, TOCOCCI STREAM­ CIFIC SOLVED CHEM-. FECAL, FECAL, T/ME FLOW, INSTAN- TANEOUS CON­ DUCT­ ANCE 0,4 (STfiNo- A90 TEMPER- ATURE TJR•• BID- ITY OXYGEN, (PER- ICAL 0.7 KF AGAR DIS- CENT (HIGH UM-MF (COLS. SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMNOS) UNITS) (DEG C) (NTU) CMG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1983 13... 0935 31 233 1.1 22.0 25 3.8 103 <10 2100 8100 DEC 13... 0925 5.9 215 9.4 21.0 3.2 8.8 100 <10 200 440 MAR 1934 02... 1045 3.2 298 8.6 24.0 1.5 13.1 122 <10 64 320 APR 26... 1030 2.7 299 8.7 24.5 1.3 13.2 123 11 60 330 JUN 26... 1815 3.7 296 8.6 26.0 1.8 3.4 105 15 K180 2100 AUG 22... 1815 3.2 292 8.6 27.0 1.0 7.2 92 <10 350 420 HARD- MAGNE- SODIUM POTAS-.. ALKA- CHLO.". FLUO-• HARD- NESS, CALCIUM SIUM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR... DIS- DIS- DIS- SORP- DIS- FIELD DIS- DIS- OIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/1 (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT , 1983 18... 99 4 31 5.2 8.0 .4 1.1 95 7.8 6.6 <.10 DEC 13... 148 MAR , 1984 02... 134 APR 26... 140 0 42 7.5 11 .4 1.1 148 9.8 9.7 .20 JUN 26... 131 AUG 22... 120 0 37 6.5 9.9 .4 1.2 131 3.2 8.3 .10 SOLIDS, SOLIDS, NITRO."' SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- GEN,AM- DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 18... 20 140 11 24 <.01 1.7 .04 .66 .70 2.4 DEC 13... 5 <.01 .90 .02 .28 .30 1.2 MAR , 1984 02... -- 6 <.01 .60 <.01 .20 .80 APR 26... 21 190 1.4 <1 <.01 .40 <.01 .30 .70 JUN 26... 6 <.01 .30 .05 <.10 AUG 22... 20 170 1.5 3 <.01 .40 <.01 .30 .70 K = non-ideal count 217 RIO PORTUGUES BASIN 50115000 RIO PORTUGUES NEAR PONCE, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- BARIUM, CADMIUM MIUM, LEAD. MERCURY SILVER. NITRO- PM0S- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN. PMORUS. ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM. RECOV­ TOTAL TOTAL TOTAL ERASLE ERASLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UW. (UG/L DATE AS NO3) AS P) AS AS) AS 3A) AS CO) AS CR) AS P3) AS MG) AS SE) AS AG) OCT r 1983 18... 11 .07 1 <100 1 5 1 <.1 <1 2 DEC 13... 5.3 .05 MAR , 1984 02... 3.5 .02 APR 26... 3.1 .05 1 <100 1 1 <1 .5 <1 <1 JUN 26... .02 AUG 22... 3.1 .04 STREAMFLOW, SPECIFIC CON- TEMPERA- STRFAMFLOW. SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMMOS) (DEG C) (CFS) (LIMNOS) (DEG C) NOV. 03 1105 10 293 24.0 MAY, 15 1319 3.4 294 28.0 JAN. 19 1434 4.9 293 24.5 218 RIO PORTUGUES BASIN 50116200 RIO PORTUGUES AT PONCE, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°00'20", long 66°36'28", 1,300 ft (400 m) south of Las Americas Avenue Bridge, 1.2 mi (1.9 km) south of CSC 50115900, 0.8 mi (1.3 km) west of Highways 1 and 2 junction, and 0.7 mi (1.1 km) southeast of Ponce. DRAINAGE AREA.--18.9 sq mi (49.0 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN CCLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PM TJR- JXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARD ATURE I7Y SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT ' 1933 13... 1315 39 293 8.2 30.0 33 7.2 96 26 K140000 62000 DEC 13... 1520 5.3 413 5.3 11.0 65 5.5 76 19 K200000 45000 MAR , 1934 01... 1 710 2.6 522 8.7 30.5 12 5.4 72 20 K7900 3200 APR 27... 3930 4.1 480 8.0 25.0 3.6 5.3 61 24 40000 5000 JUN 25... 1830 3.1 462 8.0 30.0 17 3.1 41 2? K170000 4500 AUG 22... 0805 1.9 530 7.8 25.5 12 3.5 44 15 47000 67300 HARD- mAGNE- SODIUM POTAS- ALKA- CMLO- FLUO- HARO- NESS, CALCIUM SIUM, SODIUM, AC- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- DIS- ors- SORP- DIS- FIELD DIS- OIS- OIS- (MG/L DONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT , 1983 18... 110 0 34 6.7 13 .6 2.2 112 18 12 .20 DEC 13... 117 MAR , 1934 01... 122 APR 27... 160 12 43 12 32 1 2.7 145 55 28 .20 JUN 25... 131 AUG 22... 170 12 45 13 48 2 2.4 154 81 39 .40 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM-.. DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS". (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENOED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) OAT) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 18... 13 170 13 54 1.3 .03 1.3 .30 .80 1.1 2.4 DEC .... 13... 84 .14 .06 .20 .86 1.2 2.1 2.3 MAR , 1984 01... 6 .42 .13 .60 .61 .69 1.3 1.9 APR 27... 15 270 3.0 16 .13 .07 .20 1.4 .20 1.6 1.8 JUN 25... 32 .15 .15 .30 1.0 .70 1.7 2.0 AUG 22... 13 340 1.7 3 .04 .06 .10 1.6 .70 2.3 2.4 K = non-idoal count 219 RIO PORTUGUES BASIN 50116200 RIO PORTUGUES AT PONCE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- 3ARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERA3LE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L CUG/L (UG/L (UG/L (UG/L (UGIL CUG/L OATE AS NO3) AS P) AS AS) AS 3A) AS CD) AS CR) AS P3) AS HG) AS SE) AS AG) OCT , 1983 18... 11 .23 1 <100 1 3 3 (.1 <1 <1 DEC 13... 17 .56 MAR , 1954 01... 9.4 .52 APP 27... 3.0 .45 1 <103 1 2 2 .2 <1 <1 JUN 25... 3.9 .57 AUG 22... 11 .55 CHLOR- DI- PC 3, *LORIN, DANE, 000, DOE, DOT, AZINON, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) CUG/L) (UG/L) (UG/L) JUN , 1934 25... 1900 <.1 (.31 <.1 (.01 <.01 (.01 .03 HEPTA- METH- DI- ENDO- NE)TA- CHLOR MALA- OXY- ELDRIN SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINOANE THION, CHLOR, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN , 1984 25... <.01 <.01 (.01 <.01 <.01 <.31 <.01 <.01 (.01 NAPH­ THA­ METHYL METHYL LENES, PAPA- TRI- PARA- POLY- PER- TOX- TOTAL THION, THION, MIREX, THION, CHLOR. THANE APHENEr TRI­ TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION DATE (UG/L) (UG/L) (UG/L) CUG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN • 1984 25... <.01 <.01 <.01 (.01 <.10 <.1 <1 <.01 220 RIO GUAYANILLA BASIN 50124200 RIO GUAYANILLA NEAR GUAYANILLA, P.R. LOCATION.--Lat 18°02'40", long 66°47'53", Hydrologic Unit 21010004, on left bank, 0.7 mi (1.1 km) north of junction of Highways 2 and 132, 0.6 mi (1.0 km) downstream from Quebrada Consejo, 1.8 mi (2.9 km) north-northwest from Plaza de Guayanilla. DRAINAGE AREA.--18.9 sq mi (49.0 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1981 to current year. GAGE.--Water-stage recorder. Altitude of gage is 80 ft (24.4 m) from topographic map. REMARKS.--Records fair. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 14,700 cu ft/s (416 cu m/s) Sept. 12, 1982, gage height, 20.4 ft (6.21 m) from floodmarks, 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, 1.8 cu ft/s (0.051 cu m/s) Apr. 17-19, 1981. EXTREMES FOR CURRENT YEAR.--Peak discharges above base of 800 cu ft/s (22.7 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Sept. 20 0100 *753 21.3 9.21 2.807 Minimum discharge, 2.7 cu ft/s (0.076 cu m/s) May 9-11. DISCHARGE. IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES OAT OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 9.7 21 14 11 5.9 5.5 4.1 3.5 4.1 3.6 6.0 11 2 6.5 20 15 10 o.3 5.4 4.2 3.9 4.1 3.4 9.0 23 3 7.0 31 15 9.5 6.8 5.2 4.2 3.4 3.8 3.2 7.1 75 4 6.6 139 14 10 7.3 4.9 4.4 3.1 4.0 3.4 6.7 42 5 6.9 105 14 12 7.6 4.9 4.2 3.0 19 31 6.7 16 6 6.1 70 14 11 7.5 5.3 3.9 2.9 15 9.7 6.6 17 7 5.7 111 13 10 7.6 5.0 4.0 2.9 7.2 5.8 6.4 9.6 8 5.7 65 13 19 7.5 4.5 3.8 2.8 5.7 4.7 6.4 7.7 9 5.7 46 13 14 13 4.3 3.7 2.8 4.9 4.3 6.5 6.6 10 40 57 13 8.9 13 4.6 3.8 2.7 4.3 4.5 6.4 6.1 11 31 75 14 7.5 9.0 4.5 4.9 2.8 7.8 4.4 6.4 6.6 12 68 45 15 9.2 7.5 4.3 4.6 3.1 8.5 4.4 5.9 6.4 13 52 49 16 7.8 8.8 4.2 3.9 5.7 5.6 4.2 6.2 7.2 14 63 36 23 7.7 10 3.8 3.8 6.3 4.8 7.6 6.0 11 15 48 29 23 7.1 7.3 3.3 3.8 4.9 4.4 9.1 6.7 9.4 16 48 26 20 6.9 6.9 3.3 3.6 5.1 4.0 5.4 6.3 12 17 75 23 83 6.7 6.9 3.8 3.6 4.6 4.6 5.9 5.7 30 18 58 22 70 6.6 6.7 3.7 3.6 3.8 15 10 5.5 161 19 46 21 24 6.4 6.6 3.2 3.3 3.5 12 11 5.2 228 20 38 20 16 6.5 6.8 3.2 3.2 3.3 5.8 22 5.2 408 21 80 18 80 6.3 6.7 3.3 3.2 3.3 4.6 12 5.2 138 22 76 18 50 6.3 6.5 3.1 3.4 4.7 4.2 7.8 5.1 65 23 57 18 24 7.6 6.6 3.2 3.3 13 3.9 6.0 5.0 45 24 39 17 18 6.5 6.6 4.8 3.3 36 3.7 5.6 4.8 23 25 30 16 15 5.9 6.4 3.3 3.2 19 3.6 5.2 5.0 19 26 25 16 14 5.7 6.2 3.2 11 6.7 3.7 5.2 9.4 10 27 22 15 13 5.8 6.2 3.4 13 5.1 3.6 6.9 5.5 35 28 21 14 12 5.8 5.7 3.5 5.1 5.0 3.8 10 7.1 22 29 42 14 12 5.7 5.5 3.5 3.8 7.2 3.5 13 5.2 11 30 50 14 11 5.9 --- 3.5 3.7 5.3 4.1 7.1 27 7.1 31 27 --- 11 5.9 3.6 --- 4.8 --- 6.1 15 --- TOTAL 1095.9 1171 702 255.6 215.4 126.3 131.6 184.2 183.3 242.5 221.2 1468.7 MEAN 35.4 39.0 22.6 8.25 7.43 4.07 4.39 5.94 6.11 7.82 7.14 49.0 MAX 80 139 83 19 13 5.5 13 36 19 31 27 408 MIN 5.7 14 11 5.7 5.5 3.1 3.2 2.7 3.5 3.2 4.8 6.1 CFSM 1.87 2.06 1.20 .44 .39 .22 .23 .31 .32 .41 .38 2.59 IN. 2.16 2.30 1.38 .50 .42 .25 .26 .36 .36 .48 .44 2.89 AC-FT 2170 2320 1390 507 427 251 261 365 364 481 439 2910 CAL YR 1983 TOTAL 6992.6 MEAN 19.2 MAX 327 MIN 3.0 CFSM 1.02 IN 13.76 AC-FT 13870 WTR YR 1984 TOTAL 5997.7 MEAN 16.4 MAX 408 MIN 2.7 CFSM .87 IN 11.80 AC-FT 11900 WATER. QJALITY RECORDS PERIOD OF RECORD.-­WATER YEARS AUGUST 1931 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1934 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMMOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 03 1240 5.4 323 31.5 MAR, 20 1342 3.2 351 30.0 NOV. 02 1020 20 346 25.0 APR. 14 12)6 4.5 359 29.0 DEC. 07 1145 14 432 25.0 MAY. 02 1008 4.4 390 28.0 JAN, 18 1043 6.8 412 25.0 JUN. 05 1236 3.9 335 33.5 FEB, 16 1006 6.9 384 24.5 AUG. 03 0810 7.3 360 25.5 RIO GUAYANILLA BASIN 50124700 RIO GUAYANILLA AT CENTRAL RUFINA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°00'40", long 66°46'49", at dirt road bridge, 0.7 mi (1.1 km) from mouth, 0.9 mi (1.4 km) east of Central Rufina and and 0.9 mi (1.4 km) southeast of Guayanilla. DRAINAGE AREA.--22.8 sq mi (59.1 sq km). PERIOD OF RECORD.--Water years 1960-65, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN' OXYGEN COLI- STREP- S1E- DIS- DEMAND, 'ORM, TOCOCCI STREAM- CIFIC SOLVED CHEM-• FECAL, FECAL, FLOW, CON- PM TOR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- 8ID- OIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARD ATURE ITT SOLVED SATUR-. LEVEL) (COLS./ PER DATE (CES) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1933 19... 0925 47 322 8.1 25.5 45 3.3 132 <10 52030 57)00 DEC 14... 0915 1.6 935 7.7 24.3 1.5 .0 0 2' K660030 K110000 MAR p 1984 01... 1435 1.1 933 7.7 31.5 3.4 .0 0 85 K1000000 K170000 APR 25... 1715 .51 1020 7.8 33.5 1.0 .0 0 93 3500000 37303 JUN 27... 0930 1.2 1040 7.7 27.0 2.7 1.2 15 73 K110000 K11000 AUG 23... 0890 .96 1070 7.8 27.0 1.5 .0 0 87 K990000 K120000 HARD- mAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS, CALCIUM SIUM, SODIUM, 40* SIUMs LINITT SULFATE RIDE, RIDE, NESS NONCAR- DIS- OIS- DIS." SORP- DIS- FIELD DIS- DIS- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MS) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT e 1983 19... 140 22 38 10 10 .4 1.5 114 27 11 .10 DEC 14... ./. .1. 296 MAR , 1984 01... 326 -- APR 25... 270 0 73 21 75 2 1.3 ,344 110 100 .20 JUN 27... 323 AUG 23... 280 2 79 21 74 2 8.2 232 79 73 .20 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO.- NITRO- NITRO"' GEN,AM- On- CONSTI- DIS- AT 105 GEN, GEM, GEM, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. Co NITRATE NITRITE N0241403 AMMONIA ORGANIC ORGANIC GEN, (MG/L On- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENOEO (MG/L (MS/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 19... 17 180 23 33 1.1 .02 1.1 .35 .45 .80 1.9 DEC 14... -- 6 -- .02 <.10 6.5 2.9 9.4 - - MAR , 1984 01... 12 -- .02 <.10 20 25 45 APR 25... 27 620 .85 12 .02 <.10 20 5.0 25 JUN 27... ... ..... .... 6 .08 I. .07 <.10 14 13 AUG 23... 27 530 1.2 12 .02 <.10 17 11 28 K non-ideal count 221 222 RIO GUAYANILLA BASIN 50124700 RIO GUAYANILLA AT CENTRAL RUFINA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHR1- 3ARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PlOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- R7COV- RECOV- RECOV- NIUM, RECOV­ TOTAL TOTAL TOTAL ERA3LE ERA6LE ERA5LE ERAFLE ERA3LE TOTAL ERABLE (MG/L (MG/L (UG/L (JG/L (UG/L (UG/L (UG/L (UG/L (UG/L (JG/L CATE AS NO3) AS P) AS AS) AS 3A) AS CO) AS CR) AS P3) AS HG) AS SE) AS AG) OCT • 1983 19... 8.4 .20 1 <100 1 2 3 <.1 <1 <1 DEC 14... .20 MAR , 1984 01... 4.5 APR 25... 5.4 2 100 1 2 1 .6 <1 2 JUN 27... 3.5 AUG 23... 4.9 CHLOR- D/- PClo ALORIN, CANE, ODD, DOE, DDT, AZINON, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (US/L) (UG/L) (UG/L) JUN r 1984 27... 0930 <.1 <.01 <.1 <.01 <.01 ‹.01 .14 HEPrA- METH- DI- ENDO- HEPTA- CHLOR MALA- OXY- ELORIN SULFAN, ENORINo ETHEON, CHLOR, EPDXIDE LINDANE THION, CHLOR, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (U3/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN , 1984 27... <.01 <.01 <.01 <.01 <.01 (.01 <.01 <.01 <.01 NAPH­ THA- METHYL METHYL LENES, PARA- TRI- POLY'• PER- TOX- TOTAL THION, THION• MIREX• THIONs CHLOR. THANE APHENEr TRI- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UM.) (UG/L) JUN r 1984 27... <.01 <.01 <.01 <.01 <.10 <.1 <1 <.01 223 RIO YAUCO BASIN 50126150 RIO YAUCO ABOVE DIVERSION MONSERRATE 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 Yonserrate, 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 mi (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 current year. CAGE.--Water-stage recorder. Altitude of gage is 115 ft (35 m), from topographic map. REMARKS.--Records poor. Flow affected by numerous diversions into and out of the basin. AVERAGE DISCHARGE.--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 flood- mark, from rating curve extended above 300 cu ft/s (8.50 cu m/s) on basis of step-backwater analysis; minimum daily discharge, 0.2 cu ft/s (0.006 cu m/s) June 30, 1978. EXTREMES FOR CURRENT YEAR.--Peak discharges above base of 1,000 cu ft/s (28.3 cu m/s) and maximum (*): Discharge Gage height Date Time (cu ft/s) (cu m/s) (ft) (m) Sept. 19 2000 *2,260 64.0 5.55 1.692 Minimum discharge, 1.2 cu ft/s (0.034 cu m/s) Mar. 19. DISCHARGE. IN CUBIC FEET PER SECOVO• MATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 8.3 5.7 9.2 6.5 8.6 8.9 7.9 7.9 34 59 2.6 2.2 2.7 3.8 6.3 14 3.2 3.2 2.5 2.5 3.7 8.4 29 74 3 4 5 4.5 5.1 5.5 40 238 102 9.5 7.3 7.1 7.6 3.1 12 6.1 8.1 8.4 2.0 1.7 1.8 4.1 3.9 2.8 3.9 3.2 3.0 3.1 3.7 3.6 2.4 2.5 155 5.6 4.3 4.1 95 45 7.0 6 7 8 4.9 4.5 3.5 34 117 29 7.0 6.7 7.1 13 13 11 6.0 6.2 5.3 2.4 2.0 1.9 3.0 2.7 2.7 3.0 2.8 2.6 5.6 4.5 3.8 19 7.0 5.0 4.1 3.8 3.7 13 3.6 2.4 9 2.3 7.5 5.7 14 29 1.9 2.4 2.6 3.4 4.4 3.6 2.0 10 15 108 5.0 9.5 32 3.0 2.0 2.6 3.0 4.0 3.4 1.9 11 12 13 14 9.6 54 24 85 105 17 52 35 5.2 5.1 4.8 10 27 8.6 7.1 7.0 12 13 5.8 17 2.1 4.3 3.4 2.7 2.3 2.3 2.2 2.7 2.6 2.4 4.6 8.0 3.0 8.0 3.5 2.9 4.0 3.9 3.7 3.9 3.4 3.4 3.5 3.3 3.8 4.8 2.9 5.1 15 26 16 4.6 6.3 6.2 2.8 3.3 4.4 2.6 7.2 3.2 6.3 16 11 13 5.4 6.1 25 2.8 3.3 16 2.6 4.3 3.2 41 17 18 88 43 10 9.6 107 43 6.2 6.7 26 5.0 2.9 2.4 3.8 4.2 20 4.4 2.6 5.5 3.6 5.8 3.0 2.8 98 257 19 24 8.9 4.5 9.5 3.7 1.7 3.7 3.2 12 24 2.6 290 20 5.4 8.3 2.2 8.6 3.5 2.1 3.5 3.0 4.2 49 2.6 361 21 114 7.7 126 9.2 2.5 2.0 3.3 2.5 3.4 6.8 2.6 204 22 104 7.4 74 11 2.8 2.1 3.3 2.9 2.9 5.3 2.6 51 23 41 7.2 21 31 3.3 2.7 3.3 11 2.6 4.5 2.6 20 24 15 7.5 15 7.5 2.4 4.4 3.1 67 2.4 4.0 2.7 19 25 9.3 8.5 12 5.7 2.1 3.0 3.1 45 2.4 3.7 2.9 15 26 8.1 10 12 5.5 1.8 2.3 3.4 7.6 2.5 3.5 3.1 7.6 27 9.4 10 9.7 5.4 1.7 2.4 7.4 5.4 2.3 4.0 2.8 31 28 9.2 9.5 9.5 6.4 2.1 1.7 4.2 4.9 2.2 11 4.6 17 29 135 9.0 9.0 8.0 1.7 1.7 3.0 6.3 2.3 19 2.8 8.0 30 53 8.6 8.4 6.8 --- 1.9 3.1 4.6 2.4 5.3 11 5.9 31 17 --- 7.6 7.9 1.9 --- 4.0 --- 4.0 36 --- TOTAL 944.3 1051.4 568.9 301.5 331.7 74.8 98.6 273.8 109.4 384.8 149.4 1721.3 MEAN 30.5 35.0 18.4 9.73 11.4 2.41 3.29 8.83 3.65 12.4 4.82 57.4 MAX MIN 135 2.3 238 6.5 126 2.2 31 5.4 59 1.7 4.4 1.7 7.4 2.0 67 2.4 12 2.2 155 2.4 36 2.6 361 1.9 CFSM 1.12 1.29 .68 .36 .42 .09 .12 .33 .13 .46 .18 2.11 IN. AC-FT 1.29 1870 1.44 2090 .78 1130 .41 598 .45 658 .10 148 .13 196 .37 543 .15 217 .53 763 .20 296 2.35 3410 CAL YR 1983 TOTAL 6957.3 MEAN 19.1 MAX 735 MIN 1.5 CFSM .70 IN 9.51 AC-FT 13800 VTR YR 1984 TOTAL 6009.9 MEAN 16.4 MAX 361 MIN 1.7 CFSM .60 IN 8.22 AC-FT 11920 224 RIO YAUCO BASIN 50126150 RIO YAUCO ABOVE DIVERSION MONSERRATE NEAR YAUCO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUS' 1931 TO CURRENT YEAR WATER-OUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMMOS) (DEG C) (CFS) (UMMOS) (DEG C) OCT, 04 0855 4.5 393 25.0 MAR, 19 1435 2.2 417 29.0 NOV, 01 10)0 3.1 324 26.0 APR, 03 1255 4.8 414 28.0 DEC, 05 1050 7.2 473 25.0 JUN, 04 1045 3.9 392 29.0 JAN, 1 7 1105 6.1 410 25.0 AUG, 02 0835 8.4 366 26.0 FEE, 15 1212 6.1 389 24.5 225 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 side 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.--45.5 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 current year. GAGE.--Water-stage recorder. Datum 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.--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/s (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 m), from floodmarks, from rating curve extended above 2,000 cu ft/s (56.6 cu m/s) on basis of step-backwater analysis and indirect measurement of peak flow; no flow many days in most years. EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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. 4 2000 1,370 38.8 10.94 3.334 July 5 1015 1,200 34.0 10.49 3.197 Nov. 7 1900 1,100 31.2 10.21 3.112 Sept. 18 2045 1,640 46.4 11.58 3.530 Nov. 10 2200 1,120 31.7 10.28 3.133 Sept. 20 0415 *2,070 58.6 12.50 3.810 Dec. 17 2000 1,360 38.5 10.92 3.328 Sept. 20 2330 1,820 51.5 11.99 3.654 Dec. 21 2100 1,510 42.8 11.27 3.435 Minimum discharge, 0.11 cu ft/s (0.003 cu m/s) Aug. 31. DISCHARGE, IN CJBIC FEET PER SECONID, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAT OCT NOV DEC JAN FEB MAR APR MAT JUN JUL AUG SEP 1 1.7 3.4 2.1 1.5 .47 .80 1.1 .87 1.2 .57 .58 29 2 1.6 2.8 2.4 1.5 84 .76 1.2 .86 1.2 .56 .80 26 3 1.7 54 3.6 1.4 8.3 .75 1.2 .80 1.2 .49 .62 140 4 1.7 484 2.9 1.2 2.5 .70 1.3 .76 1.2 .66 .58 191 5 1.6 249 2.6 1.4 2.0 .69 1.3 .68 1.2 447 .57 17 6 1.6 136 2.2 1.7 1.9 .71 1.3 .63 1.3 61 .57 50 7 1.6 208 2.1 2.2 1.3 .74 1.2 .68 1.3 8.5 .64 8.0 8 1.6 96 2.1 1.5 1.7 .88 1.1 .67 1.2 3.7 .77 2.4 9 1.6 22 2.0 5.8 3.7 .80 .98 .64 1.1 2.7 .81 1.9 10 1.5 136 2.0 3.8 30 .75 1.1 .61 1.2 3.3 .81 2.0 11 2.1 226 1.9 52 13 .68 1.1 .57 1.1 3.8 .72 1.6 12 5.4 39 1.9 17 3.2 .69 .98 .73 1.1 2.7 .76 1.5 13 42 46 1.9 2.0 5.5 .73 .85 1.3 1.0 2.2 1.2 1.4 14 53 45 1.8 1.7 3.9 .77 .79 1.3 .91 1.9 .81 1.2 15 57 13 4.2 1.2 3.4 .84 .71 1.1 .83 1.7 .69 1.3 16 9.9 9.5 2.3 .95 15 .92 .70 33 .78 1.6 .61 1.1 17 49 7.5 194 .92 68 .88 .86 3.0 .90 1.2 .57 81 18 86 6.2 154 .94 3.0 .79 1.0 1.3 .78 1.0 .56 675 19 21 5.7 32 .75 .58 .79 .82 1.0 .79 .90 .49 636 20 6.2 5.0 7.0 .78 .44 1.0 .78 1.2 .84 17 .52 1610 21 67 4.4 201 .77 .35 1.3 .70 1.2 .89 3.6 .52 1010 22 63 3.9 117 .71 .45 1.3 .70 1.2 .83 1.0 .51 175 23 20 3.6 10 9.9 .75 1.3 .73 1.2 .66 .84 .48 53 24 5.1 3.9 5.0 9.3 .83 1.2 .73 3.1 .57 .95 .40 26 25 3.3 3.3 3.4 .94 .91 1.1 .73 96 .49 .72 .40 38 26 2.4 2.7 2.8 .66 .93 1.1 .76 5.2 .41 .65 .36 13 27 2.2 2.3 2.3 .56 .84 1.1 .86 1.3 .34 .53 .29 11 28 2.0 2.2 2.3 .51 .82 1.1 .86 1.2 .27 .46 .32 33 29 117 2.2 2.0 .45 .80 1.2 .82 1.2 .35 .46 .30 13 30 71 2.2 1.8 .44 --- 1.3 1.0 1.2 .52 .65 .23 12 31 9.1 --- 1.6 .44 1.2 --- 1.2 --- .57 .20 --- TOTAL 709.9 1824.8 774.2 124.92 259.07 28.87 28.26 165.70 26.46 572.91 17.69 4861.4 MEAN 22.9 60.8 25.0 4.03 8.93 .93 .94 5.35 .88 18.5 .57 162 MAX 117 484 201 52 84 1.3 1.3 96 1.3 447 1.2 1610 MIN 1.5 2.2 1.6 .44 .35 .68 .70 .57 .27 .46 .20 1.1 CFSM .50 1.34 .55 .09 .20 .02 .02 .12 .02 .41 .01 3.56 IN. .58 1.49 .63 .10 .21 .02 .02 .14 .02 .47 .01 3.97 AC-FT 1410 3620 1540 248 514 57 56 329 52 1140 35 9640 CAL YR 1983 TOTAL 7303.08 MEAN 20.0 MAX 1430 MIN .53 CFSM .44 IN 5.97 AC-FT 14490 MTR TR 1984 TOTAL 9394.18 MEAN 25.7 MAX 1610 N/N .20 CFSN .57 IN 7.68 AC-FT 18630 226 RIO YAUCO BASIN 50128000 RIO YAUCO NEAR YAUCO, PR--Continued WATER QUALITY RECORDS 0 FRI0D CF RECORD.--WATCR YEARS AUGUST 1931 TO CURRENT YE AR WATER-QUALITY DATA, WATER YEAR OCTOBER 198 3 TO SEPTEMBER 1984 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (C=S) (UMMOS) (DIG C) (CFS) (UMMOS) (DEG C) OCT, 04 1035 1.7 528 28.0 MAR, 20 0929 1.1 909 24.5 NOV, 01 1215 3.1 525 27.0 APR, 04 0931 1.5 906 26.0 DEC, Oh 1245 2.2 918 25.0 JUN, 05 0946 1.2 593 29.0 JAN, 17 1425 1.9 573 26.5 AUG, 02 1130 0.9 990 28.0 FEB, 15 1610 2.5 616 26.0 227 CANAL PRINCIPAL DE RIEGO VALLE DE LAJAS BASIN 50128950 LAJAS IRRIGATION CANAL NEAR BOQUERON, PR LOCATION.--Lat 18°02'14", long 67°08'22", Hydrologic Unit 21010004, on downstream side of wooden foot bridge near dirt levee road, 0.5 mi (0.8 km) north of intersection of Highways 101 and 103, 1.8 mi (2.9 km) northeast of Boquer6n. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--August 1980 to September 1984 (discontinued). GAGE.--Water-stage recorder. Altitude of gage is about 82 ft (25 m), from topographic map. REMARKS.--Records poor. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum discharge, 34 cu ft/s (0.963 cu m/s) June 11, 1981, gage height, 2.56 ft (0.780 m) from rating curve extended above 10 cu ft/s (0.283 cu m/s) on basis of step-backwater analysis; no flow many days each year. EXTREMES FOR CURRENT YEAR.--Maximum discharge, 32 cu ft/s (0.906 cu m/s) Mar. 26, gage height, 2.63 ft (0.802 m); no flow many days. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .52 .55 .00 .00 2.1 .00 .00 6.8 1.7 3.0 .00 .00 2 .00 .00 .00 .00 5.0 1.1 .58 .00 .00 2.2 .98 .00 3 3.4 1.1 .00 1.7 3.7 .00 5.3 .00 .00 9.0 .64 .00 4 6.1 2.0 .00 .74 .74 .00 2.6 3.1 .44 12 6.1 1.8 5 4.2 .00 .00 10 .00 .00 5.4 .00 2.3 16 5.2 9.6 6 .00 .00 .00 4.8 .72 5.2 3.2 .00 2.7 1.2 2.6 7.1 7 2.4 2.3 4.2 4.5 6.7 4.5 .00 .00 3.0 .00 1.7 7.0 8 .15 .00 .00 5.3 3.6 2.1 .00 4.4 6.3 .00 3.0 .00 9 .00 .00 .00 8.6 10 .03 5.6 1.6 .00 .00 .00 .00 10 2.1 .00 .00 7.1 6.6 .00 7.2 4.8 .00 .00 .25 8.0 11 1.6 .00 .00 13 .00 .00 3.4 4.6 8.0 .00 .00 .00 12 1.3 .00 2.5 14 .00 1.9 13 .00 7.6 .00 .35 .00 13 2.0 .00 4.7 4.8 .00 10 6.4 .00 3.7 .00 3.0 .00 14 .00 .00 2.4 .45 .00 5.8 .00 2.1 8.3 .00 5.1 2.5 15 .00 .00 3.7 .75 .00 .00 .00 12 4.3 .00 2.0 1.1 16 .00 .00 .95 .74 .00 3.6 .00 4.9 .00 .00 .69 .00 17 .86 .00 .99 .00 .00 .00 .95 .73 .00 .00 .00 4.0 18 1.8 .00 1.2 .00 .00 .00 1.4 3.8 .00 1.9 .00 .00 19 3.2 .00 .85 .00 .00 .00 7.2 .00 2.4 5.6 .00 .69 20 .63 .00 2.5 .00 .00 2.1 5.1 .00 9.2 2.6 3.3 5.3 21 1.9 .00 1.2 .00 .00 2.8 5.2 2.3 4.5 .00 3.3 .00 22 .00 .90 1.1 .00 .48 8.1 6.9 2.9 7.1 .00 1.0 .00 23 .00 .00 .00 .00 1.3 15 4.2 2.0 .00 1.2 .16 .00 24 .00 .00 .00 .00 3.0 .00 5.7 2.2 .00 7.6 2.8 .00 25 .00 .00 .00 .00 .76 .00 3.4 1.6 .94 8.3 .52 .00 26 2.1 .00 .00 .00 .00 5.5 6.4 .00 1.5 7.0 .00 .00 27 2.4 .00 2.4 .00 .00 2.7 2.9 .00 8.1 .00 3.4 .00 28 .00 .00 .12 .00 3.1 7.8 .00 .00 11 .00 3.3 .00 29 .00 .00 .00 .00 2.3 6.8 .00 3.6 12 .00 .74 .00 30 .00 .00 .00 .00 --.. .87 2.0 .93 3.5 .00 2.3 .00 31 .00 --- .00 .00 .00 --- 2.5 --- .00 .66 --- TOTAL 37.16 6.85 28.81 76.48 55.10 85.87 123.03 66.86 108.58 77.60 54.09 47.09 MEAN 1.20 .23 .93 2.47 1.90 2.77 4.00 2.16 3.62 2.50 1.74 1.57 MAX 6.1 2.3 4.7 14 10 15 13 12 12 16 6.1 9.6 MIN .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 AC-FT 74 14 57 152 109 170 238 133 215 154 107 93 WTR YR 1984 TOTAL 764.52 MEAN 2.09 MAX 16 MIN .00 AC-FT 1520 WATER QUALITY RECORDS PERIOD OF RECORD.--JANUARY 1933 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1994 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) NOV, 09 1435 0.0 218 33.0 APR, 06 0902 8.2 259 24.5 OEC, 07 1720 3.4 230 27.0 MAY, 15 1707 0.0 213 27.0 JAN, 16 1500 .32 267 30.5 JUN, 06 1520 7.0 262 28.0 FEB, 09 1340 8.2 265 23.0 JUL, 12 1653 0.0 119 31.5 MAR, 07 0848 12 251 24.5 AUG, 10 1050 1.6 255 28.5 228 RIO LOCO BASIN 50129700 RIO LOCO AT GUANICA, PR WATER-QUALITY RECORDS LOCATION.--Lat 17°58'33", long 66°54'52", 0.6 mi (1.0 km) northwest of Guanica and 1.2 mi (1.9 km) northeast of Ensenada. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1975 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN coLr- STREP- SDE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- P1 TJR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- 015- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARD ATURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (OEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1983 1 9... 1125 E .00 764 7.8 27.5 1' 2.9 37 30 2700 4200 DEC 14... 1050 E .00 7310 7.8 29.5 2.5 2.4 32 36 5230 800 MAR , 1934 01... 1215 E .00 403 8.0 26.0 7.5 6.5 80 13 600 540 APR 25... 1325 E .00 24000 7.8 33.5 2.4 6.4 93 370 423 JUN 2 7... AUG 1330 E .00 12400 7.8 29.0 2.4 5.) 68 64 260 K63 23... 1230 E .00 12900 7.9 30.9 1.0 11.5 158 230 K150 K64 WARD- MASNE- SO)IJM POTAS- ALKA- CHLO- FLUO- HARO- NESS, CALCIUM SIUM, SODIUM, AO- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- DES- DIS- SORP - DIS- FIILD DIS- DIS- OIS- (MG/L EDNATE SOLVED SOLVED SOLVED TEON SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MI/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS () CAC03) AS SO4) AS CL) AS F) OCT 1933 19... 251 2 50 31 31 2 3.2 251 58 88 .30 DEC 14... 341 -- 2900 MAR 1984 01... 134 APR 25... 3300 2700 210 501 4300 39 160 260 1200 9200 .60 JUN 27... 297 39 AUG 23... 1300 970 110 241 2430 30 72 292 550 4000 .40 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- 01S- CONSTI- MS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO ­ SOLVED TUENTS, SOLVED DEG. Co NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L 01S- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENOED (MG/L (MS/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE 5IO2) (MG/L) DAY) (MS/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT 1933 19... 26 490 .00 13 .18 .02 .20 .02 .68 .70 .90 DEC 14... 20 .09 .01 .10 .24 .26 .50 .60 MAR 1984 01... 6 <.01 .50 <.01 .20 .70 APR 25... 23 16000 .00 10 <.01 <.10 .07 .33 .40 JUN 2?... 6 <.01 <.10 .10 .10 .20 AUG 23... 27 7600 .00 8 <.01 <.10 .07 .53 .60 E = estimate K = non-ideal count 229 RIO LOCO BASIN 50129700 RIO LOCO AT GUANICA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO­ BARIUM, CADMIUM MIUM• LEAD, MERCURY SILVERS NITRO- P:OS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS• ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV­ TOTAL TOTAL TOTAL ERA3LE ERASLE ERASLE ERABLE ERA3LE TOTAL ERA8LE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L CATE AS NO3) AS p) AS AS) AS 3A) AS CD) AS CR) AS P3) AS MG) AS SE) AS AG) OCT • 1983 19... 4.0 .23 1 109 1 13 2 <.1 <1 1 DEC 14... 2. 7 .15 MAR • 1984 01... 3.1 .03 APR 25... .10 1 100 1 3 1 1.6 (1 JUN 27... .10 AUG 23... .20 CHLOR- DI- PC 3, ALDRIN• OAN£, 000, 00E, DDT, AZINON, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UGIL) (UGIL) (JG/L) (UG/L) (UG/L) (UG/L) JUN • 1984 27... 1330 <.1 <.31 <.1 <.01 <.01 (.01 <.01 HEPTA- METH- DI- ENDO- HEPTA- CHLOR MALA- OXY- ELORIN iULFAN• ENDRIN, _THION• CM,OR, EPDXIDE LINOANE THION, CHLOR, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UGIL) (US/L) (UGIL) (Ul/L) (UG/L) (US/L) (UGIL) (UG/L) JUN • 1984 27... <.01 <.01 <.01 <.01 <.01 <.01 <.01 (.01 <.01 NAPH- THA- METHYL METHYL LEWES, PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION• THION• MIR=X• THION, CHLOR. THANE APHENE, TRI­ TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION DATE (UGIL) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN , 1934 27... <.01 <.01 <.01 <.01 <.10 <.1 <1 <.01 MAYAGUEZ Frto YagL4z Oasis rz:C Pfuntre es Masco be:SAL 0,0r alto Grand* mod., ~160 MARiCA 136 Droinasie boundo Y Island divide HORMiG9 ilia Yo,,:o bosin 4.vpveut .4rueter SAN 40A N Gutinajd,e) M,pYA.SUE2 CAW AS. SAJAADOM A ROJO tf?. p area WAYAMA SA Rib Loco basis, EXPLANATION 128960 Conoi Pritscipaf A1380 SURFACE—WATER STATION AND NUMBER A1300 LOW—FLOW STATION AND NUMBER v1297 QUALITY—OF—WATER STATION AND NUMBER • 143 WELL AN WELL NUMBER ,Dro;nage boundary Coastal bask* GUAMCA ENSENADA MA R CAR/ 8 E ?Kil.OMETERS WL.E Figure 22.--Rio Guanajibo basin. 232 LAGUNA CARTAGENA BASIN 50129899 LAGUNA CARTAGENA NEAR BOQUERON, PR LOCATION.--Lat 18°00'52", long 67°06'33", Hydrologic Unit 21010004, on right bank, 0.6 mi (1.0 km) south of Hacienda Desengai-lo, and 4.3 mi (6.9 km) southeast of Boquer6n. DRAINAGE AREA.--Indeterminate. LAKE LEVEL RECORDS PERIOD OF RECORD.--June to September 1984. GAGE.--Water-stage recorder. Altitude of gage is 36 ft (11.0 m), from topographic map. REMARKS.--Records good. EXTREMES FOR CURRENT PERIOD.--Maximum elevation, 11.04 ft (3.365 m) June 11: minimum, 8.09 ft (2.466 m) July 3, 4. ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1983 INSTANTANEOUS 03SERVATIONS AT 2400 TO SEPTEMBER 1984 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 8.11 8.24 8.64 2 8.10 8.25 8.53 3 8.09 3.24 8.53 4 8.25 8.22 8.43 5 3.13 10.66 8.21 3.56 6 8.16 10.28 8.19 8.53 7 3.19 9.75 8.18 8.55 8 8.17 9.40 8.16 8.50 9 A 9.18 8.14 8.46 10 8.12 9.02 8.12 8.42 11 3.28 8.89 8.11 8.33 12 3.58 8.80 8.20 8.35 13 3.57 8.73 8.17 8.34 14 3.53 8.67 8.19 8.33 15 8.48 8.60 8.21 8.30 16 8.43 8.54 8.22 8.26 17 8.40 8.48 8.23 8.47 19 8.37 8.48 8.22 8.99 19 8.32 8.46 8.20 9.07 20 8.28 8.43 8.14 10.08 21 8.23 8.40 8.13 10.17 22 8.20 8.38 8.12 9.84 23 3.19 8.36 8.11 9.51 24 8.20 8.31 8.11 9.29 25 8.18 8.28 8.12 9.15 26 8.18 8.31 8.13 9.01 27 8.18 8.28 8.12 8.90 28 8.17 8.29 8.11 8.83 29 8.15 8.28 8.11 8.76 30 8.13 8.32 8.35 8.70 31 --- 8.29 8.70 --- TOTAL 268.42 253.95 264.03 MEAN 8.66 8.19 8.80 MAX 10.66 8.70 10.17 MIN 8.09 8.11 8.26 A No gage-height record. 233 LAGUNA CARTAGENA BASIN 50129900 LAGUNA CARTAGENA OUTFLOW NEAR BOQUERON, PR LOCATION.--Lat 18°00'52", long 67°06'34", Hydrologic Unit 21010004, on right bank, 0.6 mi (1.0 km) south of Hacienda Desengatio, and 4.3 mi (6.9 km) southeast of Boquer6n. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--June to September 1984. GAGE.--Water-stage recorder. Altitude of gage is 36 ft (11.0 m), from topographic map. REMARKS.--Records fair. EXTREMES FOR CURRENT PERIOD.--Peak discharges above base of 60 cu ft/s (1.7 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) June 11 1515 *94 2.662 11.04 3.365 Aug. 30 1615 60 1.699 10.53 3.210 July 5 1715 68 1.926 10.66 3.249 Minimum discharge, 0.13 cu ft/s (0.004 cu m/s) July 3, 4. DISCHARGE, IN CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1983 IC SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR AOR MAY JUN JUL AUG SEP 1 .23 1.1 5.5 2 .13 .99 4.6 3 .14 .92 4.0 4 --- .49 .82 3.4 5 .38 39 .71 3.3 6 .38 59 .62 4.2 7 .52 37 .52 4.1 8 .51 23 .42 3.6 9 .44 16 .36 3.1 10 .27 12 .27 2.7 11 4.2 9.8 .21 2.3 12 3.5 8.1 .28 2.0 13 4.3 6.8 .48 1.7 14 3.9 5.8 .54 1.7 15 3.4 4.9 .59 1.5 16 2.8 4.2 .73 1.2 17 2.4 3.5 .81 2.9 18 2.1 3.1 .78 7.4 19 1.8 3.0 .67 11 20 1.4 2.8 .43 24 21 1.0 2.4 .28 44 22 .74 2.2 .25 37 23 .56 1.9 .21 26 24 .57 1.6 .19 18 25 .50 1.3 .20 15 "26 .49 1.3 .25 12 27 .49 1.3 .25 9.8 28 .48 1.2 .21 8.3 29 .40 1.3 .19 7.2 30 .31 1.4 2.6 6.2 31 --- 1.4 4.5 --- TOTAL 256.34 21.38 277.7 MEAN 8.27 .69 9.26 MAX 59 4.5 44 MIN .14 .19 1.2 AC-FT 508 42 551 WATER QUALITY RECORDS PERIOD OF RECORD.--AUGUST TO SEPTEMBER 1984 WATER-QUALITY DATA, WATER YEAR OCTOBER 1933 TO SEPTEMBER 1984 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTAMCE TURF DATE TIME INSTANTANEOUS DUCTANCE TURF (CES) (UMMOS) (DEG C) (C=SI (UMMOS) (DEG C) AUG, 10 1231 0.3 468 25.5 CENT 234 RIO GUANAJIBO BASIN 50133600 RIO GUANAJIBO NEAR SAN GERMAN, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°07'18", long 67°03'56", at bridge on Highway 347, 2.2 mi (3.5 km) northwest of San German plaza. DRAINAGE AREA.--45.5 sq mi (117.8 sq km). PERIOD OF RECORD.--November 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- 'DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- P. TOR - OXYGEN, (PER- ICAL 0.7 XF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (COLS. TIME TANEOUS ANCE A20 4TURE ITY ' SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1933 20... 0925 33 460 7.8 27.3 4.5 2.5 32 19 K85000 53J00 DEC 15... 0915 22 505 7.8 23.5 1.6 1.2 14 <10 50000 4000 MAR , 1934 01... 1030 11 653 8.0 24.0 1.4 .0 0 25 K593000 70000 APR 25... 1010 4.6 332 7.8 25.0 <1.0 .0 0 100 K2200000 K120000 JUN 27... 1720 11 644 8.1 30.0 2.1 8.2 109 22 2000 K200 AUG 23... 1630 40 592 8.1 30.0 2.2 ?.5 126 <10 23000 K100 HARD- MAGNE- SODIUM POTAS- ALKA- CHIC- FLUO- HARD- NESS, CALCIUM SIUM, SODIUM, AD- SLUM, LINITY SULFATE RIDE. RIDE, NESS NONCAR- On- CIS- DES- SORP- DIS- FIELD DIS- DIS- DI'S- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED DATE AS CAC03) (MG/L CAC03) (MG/L AS CA) (MG/L AS MG) (MG/L AS NA) RATIO (MG/L AS K) AS C ,X03) (MG/L AS SO4) (MG/L AS CL) (MG/L AS F) OCT , 1933 20... 210 9 23 36 17 .5 1.7 197 23 21 .20 DEC 15... 223 MAR , 1934 01... 230 APR 25... 270 0 32 45 48 1 4.7 311 51 62 1.9 JUN 27... 234 AUG 23... 240 0 26 42 24 .7 2.4 239 33 26 .40 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN'AM- DIS- CONSTI- SOLVED TUENTS, DIS- SOLVED AT 105 DEG. C, GEN, GEN, GEM, GEN, SEN, MONIA + NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC NITRO- GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE 5102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1933 20... 33 270 24 7 .13 .07 .20 .64 .00 .50 .80 DEC 15... 8 .04 <.10 .37 .63 1.5 MAR , 1984 01... 6 <.01 <.10 4.1 2.4 6.5 APR 25... 35 470 6.1 5 .01 <.10 10 7.0 17 JUN 27... 10 .52 .43 1.0 1.0 .90 1.9 2.9 AUS 23... 33 330 36 6 .46 .14 .60 1.1 .60 1.7 2.3 K = non-ideal count 235 RIO GUANAJIBO BASIN 50133600 RIO GUANAJIBO NEAR SAN GERMAN, PR - -Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CARO- BARIUM, CADMIUM MIUM, LEAD. MERCURY SILVER. NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN. PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERA3LE ERABLE ERA3LE ERABLE ERA3LE TOTAL ERABLE (MG/L (MG/L (UG/L (dG/L (UG/L (UG/L (UG/L (UG/L (US/L (UG/L DATE AS NO3) AS P) AS AS) AS 3A) AS CD) AS CR) AS PO AS HG) AS SE) AS AG) OCT r 1983 a 5 <.1 <1 <1 DEC 15... .46 20... 3.5 .27 1 <100 1 MAR , 1184 01... .n APR 25... 3.4 1 <100 1 17 3 .2 <1 2 JUN 27... 13 1.4 AUG 23... 10 .79 236 RIO GUANAJIBO BASIN 50136000 RIO ROSARIO AT ROSARIO, PR LOCATION.--Lat 18°10'22", long 67°04'31", Hydrologic Unit 21010003, on left bank above low dam, 0.2 mi (0.3 km) below Quebrada Figueroa, 0.7 mi (1.1 km) northeast of Rosario, and 1.6 mi (8.6 km) below Quebrada Palma. DRAINAGE AREA.--16.4 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. Altitude of gage is 230 ft (10 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--9 years (1976-84), 45.1 cu ft/s (1.277 cu m/s), 37.34 in/yr (948 mm/yr), 32,670 acre-ft/yr (40.3 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 flood- marks, from rating curve extended above 60 cu 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 above base 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. 20 1430 2,060 58.3 6.29 1.917 Sept. 18 Unknown *3,800 108 Unknown Nov. 18 1930 2,650 75.0 6.92 2.109 Minimum discharge, 8.5 cu ft/s (0.241 cu m/s) Apr. 26, May 11. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 26 42 55 22 16 16 13 9.0 41 23 48 208 2 24 39 49 21 16 19 12 9.4 32 20 46 166 3 24 62 46 20 15 16 11 11 36 22 40 232 4 29 147 44 20 16 16 14 11 194 20 41 170 5 31 99 43 21 15 15 13 10 179 190 39 71 6 31 65 41 20 14 14 11 10 105 125 33 65 7 31 104 39 23 15 14 15 10 38 53 31 50 8 32 85 39 32 15 14 22 9.5 31 43 30 54 9 27 67 37 42 51 14 15 9.3 29 33 29 71 10 28 121 35 29 40 13 11 8.7 26 36 27 78 11 41 136 34 27 23 13 11 8.8 64 53 27 89 12 58 84 32 22 24 14 9.9 9.5 54 39 28 80 13 113 73 30 20 34 13 9.8 14 38 34 27 129 14 81 120 30 20 53 12 9.7 14 30 70 29 132 15 134 101 29 20 53 12 9.6 25 27 46 45 56 16 97 76 28 28 27 12 9.4 29 25 35 35 48 17 145 65 27 21 21 12 10 113 25 72 27 123 18 127 301 27 20 19 12 12 112 25 128 24 440 19 77 163 28 19 18 12 11 66 24 101 132 170 20 278 90 33 19 17 11 9.8 51 23 74 125 232 21 158 82 38 18 16 12 12 124 23 81 77 215 22 99 69 34 18 16 12 12 96 22 65 67 109 23 139 61 30 23 16 12 9.6 171 21 59 63 78 24 80 55 28 19 16 11 9.2 216 20 57 60 64 25 63 53 25 13 15 11 9.0 104 20 50 84 58 26 56 52 24 17 15 12 23 75 19 44 79 54 27 49 51 27 17 15 12 27 127 19 47 100 56 28 45 51 24 17 15 11 12 219 19 86 70 84 29 74 51 23 16 15 11 9.8 220 18 74 114 106 30 55 60 22 16 --- 11 9.3 104 25 50 130 69 31 45 --- 21 16 11 --- 57 --- 45 200 --- TOTAL 2297 2625 1022 661 641 400 372.1 2053.2 1252 1880 1907 3562 MEAN 74.1 87.5 33.0 21.3 22.1 12.9 12.4 66.2 41.7 60.6 61.5 119 MAX 278 301 55 42 53 19 27 220 194 190 200 440 MIN 24 39 21 16 14 11 9.0 8.7 18 20 24 43 CFSM 4.52 5.34 2.01 1.30 1.35 .79 .76 4.04 2.54 3.70 3.75 7.26 IN. 5.21 5.95 2.32 1.50 1.45 .91 .84 4.66 2.84 4.26 4.33 8.08 AC-FT 4560 5210 2030 1310 1270 793 738 4070 2480 3730 3780 7070 CAL YR 1983 TOTAL 15402.7 MEAN 42.2 MAX 433 MIN 8.1 CFSM 2.57 IN 34.94 AC-FT 30550 WTR YR 1984 TOTAL 18672.3 MEAN 51.0 MAX 440 MIN 8.7 CFSM 3.11 IN 42.35 AC-FT 37040 237 RIO GUANAJIBO BASIN 50136000 RIO ROSARIO AT ROSARIO, PR--Continued WATER QUALITY RECORDS PERIOD 0' RECORD.--OCTOBER 1982 TO CURRENT YEAR WATER -QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (C'S) (UMNOS) (DEG C) (C'S) (UMHOS) (DEG C) OCT, 05 1624 31 299 22.0 APR, 05 1457 12 268 28.0 NOVr 09 1035 67 218 24.0 MAT, 16 1054 23 218 25.0 DEC, 03 0917 38 244 21.5 JUN, 07 1038 68 201 23.0 JAN, 14 0945 20 238 22.0 JUL, 12 1205 46 216 25.0 FES, 09 1032 27 250 23.5 AUG, 09 1345 29 255 27.5 MAR, 06 1419 14 252 25.5 RIO GUANAJIBO BASIN 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 mi (0.8 km) southwest of Rosario plaza. DRAINAGE AREA.--18.3 sq mi (47.4 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLT- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PN TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MR (COLS. TIME TANEOUS ANCE ARD ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMMOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1983 20... 1200 53 255 8.2 25.5 26 8.4 103 21 K1800 1400 DEC 15... 1125 31 278 8.3 22.5 1.1 9.2 107 <10 K150 270 FEB , 1984 29... 1305 14 272 7.8 26.0 2.1 11.2 138 12 K18 83 APR 24... 1705 9.7 300 8.7 29.0 4.0 9.4 123 <10 K120 K260 JUN 24... 1600 26 272 8.5 26.0 2.4 12.3 149 12 45000 10000 AUG 24... 1550 288 8.5 28.0 1.2 3.0 103 <10 K670 660 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- HARD- NESS, CALCIUM SUM, SODIUM, AO- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- DIS- DIS- SO4P- DIS- FIELD DIS- DIS- DIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT , 1983 20... 120 DEC 15... FEB , 1984 29... APR 24... 130 JUN 28... AUG 24... 120 O 22 15 6.7 .3 1.2 121 7.7 6.6 <.10 126 137 O 25 16 9.7 .4 1.1 131 7.5 9.4 .10 124 O 23 16 7.3 .3 1.1 133 7.3 7.5 <.10 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- OIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. Cr NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) CMG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 20... 23 160 23 5 .77 .03 .80 (.01 .90 1.7 DEC 15... 4 (.01 .80 .03 .27 .30 1.1 FEB , 1984 29... 5 <.01 .50 <.01 .30 .80 APR 24... 30 180 4.6 4 <.01 .30 .02 .38 .40 .70 JUN 28... 4 <.01 .40 .04 .26 .30 .70 AUG 24... 28 170 3 <.01 .50 .01 .19 .20 .70 K = non-ideal count 238 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CIRO- dARIUM, CADMIUM MIUM, LEAD, MERCURY 5'%%1 , NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERASLE ERABLE ERABLE ERABLE ERASLE TOTAL ERA3LE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS SA) AS CD) AS CR) AS PS) AS HG) AS SE) AS AG) OCT , 1993 20... 7.5 .35 1 <100 1 13 2 (.1 <1 <1 DEC 15... 4.9 .06 FE8 , 1984 29... 3.5 .01 APR 24... 3.1 .16 1 <100 <1 4 <1 .1 <1 <1 JUN 28... 3.1 .J6 AUG 24... 3.1 .03 239 240 RIO GUANAJIBO BASIN 50138000 RIO GUANAJIBO NEAR HORMIGUEROS, PR LOCATION.--Lat 18°08'36", long 67°08'57", Hydrologic Unit 21010003, at bridge on Highway 100, 1.4 mi (2.3 Km) west of Hormigueros, and 2.0 mi (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.--Records fair. AVERAGE DISCHARGE.--11 years (1974-84), 219 cu ft/s (6.202 cu m/s), 24.78 in/yr (629 mm/yr), 158,700 acre-ft/yr (196 cu hm/yr); median of yearly mean discharges, 210 cu ft/s (5.95 cu m/s), 152,000 acre-ft/yr (187 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 128,000 cu ft/s (3,625 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, 4.6 cu ft/s (0.130 cu m/s) June 22, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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) Nov. 18 unknown 3,000 85.0 unknown Sept. 14 0115 2,010 56.9 18.44 5.620 July 5 2115 2,240 63.4 19.07 5.812 Sept. 18 0530 *5,230 148 21.78 6.638 Minimum discharge, 12 cu ft/s (0.340 cu m/s) Apr. 24, 25. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 98 192 134 57 44 37 23 19 119 77 217 795 2 89 189 114 54 42 57 23 19 100 62 192 606 3 81 293 107 51 40 33 23 18 124 70 138 922 4 84 904 105 53 40 37 26 25 225 62 122 1220 5 91 881 110 69 42 35 26 21 555 1380 114 412 6 82 406 101 72 42 35 22 19 337 833 105 363 7 83 719 94 76 41 33 21 20 172 279 98 257 8 76 878 91 130 44 32 31 18 128 205 93 285 9 75 578 87 203 375 31 26 17 107 175 91 412 10 98 800 83 117 410 30 22 16 95 162 88 464 11 127 920 97 98 124 31 20 16 360 273 87 541 12 148 510 101 237 111 30 18 17 286 179 84 472 13 210 420 82 280 95 30 16 32 175 147 35 361 14 218 790 77 143 33 29 17 50 118 240 82 903 15 312 640 93 126 280 29 17 65 99 180 86 304 16 278 440 97 129 100 28 16 176 91 141 94 239 17 541 365 113 110 66 39 15 111 90 140 79 850 18 458 2300 136 100 56 31 18 324 91 234 77 3460 19 277 1150 106 92 50 28 17 243 85 286 374 1190 20 509 560 137 84 45 26 17 99 78 315 416 1740 21 635 278 174 76 40 26 19 196 77 191 145 1360 22 465 247 146 77 40 25 23 342 72 205 124 700 23 609 213 142 104 38 26 17 254 66 252 112 477 24 303 198 106 83 37 25 14 531 63 164 103 378 25 218 178 91 65 36 24 13 578 59 139 99 313 26 189 163 86 58 36 24 21 184 58 122 116 283 27 169 151 91 54 35 27 78 192 54 194 109 341 28 181 137 71 51 35 24 38 528 54 225 104 323 29 406 127 66 49 36 22 27 672 52 227 112 259 30 320 121 62 48 --- 20 22 279 88 143 608 225 31 216 --- 58 46 20 --- 154 --- 125 1090 --- TOTAL 7646 15748 3158 2992 2463 929 686 5240 4078 7427 5444 20960 MEAN 247 525 102 96.5 34.9 30.0 22.9 169 136 240 176 699 MAX 635 2300 174 280 410 57 78 672 555 1380 1090 3460 MIN 75 121 58 46 35 20 13 16 52 62 77 225 CFSM 2.06 4.38 .85 .80 .71 .25 .19 1.41 1.13 2.00 1.47 5.83 IN. 2.37 4.88 .98 .93 .76 .29 .21 1.62 1.26 2.30 1.69 6.50 AC-FT 15170 31240 6260 593D 4890 1840 1360 10390 8090 14730 10800 41570 CAL YR 1983 TOTAL 60016 MEAN 164 MAX 2300 MIN 16 CFSM 1.37 IN 18.60 AC-FT 119000 WTR YR 1984 TOTAL 76771 MEAN 210 MAX 3460 MIN 13 CFSM 1.75 IN 23.80 AC-FT 152300 241 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 1983 TO SEPTEMBER 1984 OXYGEN. OXYGEN COLI- STREP- SPE- On- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- P4 TJR - OXYGEN, (PER- ICAL 3.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- 3ID - DIS- CENT (HIGH UM-Mg (COLS. TIME TANEOUS ANCE ARD ATURE ITT SOLVED SATUR- LEVEL) (COLS./ DER DATE (CFS) (UMHDS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT r 1933 19... 1525 263 312 7.8 25.5 7) :..9 61 14 20000 21009 DEC 14... 1415 77 458 3.0 24.5 3.9 5.0 72 <10 57000 6300 gEB • 1934 29... 1615 36 470 8.0 26.3 9.5 6.0 74 10 K9700 6000 APR 24... 1155 14 510 8.2 21.0 2) 5.7 73 16 K1700 K180 JUN 23... 1115 54 442 8.2 27.0 15 7.8 98 17 330 K150 AUG 24... 1040 102 395 7.9 27.5 5.4 4.2 53 20 23000 5103 HARO­ MAGNE­ SODIUM POTAS- ALKA- CHLO- FLUO- HARD­ NESS NESS, NONCAR­ CALCIUM DIS- SIUM, OIS- SODIUM. DIS- AD- SO2P - SIJM. LINITY SULFATE RIDE, RIDE, DIS- FIELD DIS- DIS- On- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (M3/L SOLVED SOLVED SOLVED DATE AS CACO3) (MG/L :AC03) (MG/L AS CA) (M3/L AS MG) (MG/L AS NA) RATIO (MG/L AS K) AS CAC03) (mGfL AS SO4) (MG/L AS CL) (MG/L AS F) OCT , 1933 19... 140 11 22 21 9.4 .4 2.3 131 19 10 .10 DEC 14... 200 FEB , 1984 29... 226 APR 24... 210 0 32 32 19 .6 2.4 218 17 21 .30 JUN 28... 185 AUG 24... 160 0 27 23 13 .5 2.3 162 21 15 .20 SOLIDS, SOLIDS, NITRO- SILICA. SUM OF DIS- CONSTI- SOLIDS, RESIDUE DIS- AT 105 NITRO- GEN, NITRO- GEN, NITRO- GEN, NITRO- GEN, NITRO- GEN. GEN,AM- MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. Cr NITRATE NITRITE NO2+NC3 AMMONIA ORGANIC ORGANIC GEN, DATE (MG/L AS SI02) DIS- SOLVED (MG/L) (TONS PER DAY) SUS- PENDED (MG/L) TOTAL (MG/L AS N) TOTAL (MG/L AS N) TOTAL (MG/L AS N) TOTAL (MG/L AS N) TOTAL (MG/L AS N) TOTAL (MG/L AS N) TOTAL (MG/L AS N) OCT , 1983 19... 25 190 133 39 .56 .04 .60 .10 .90 1.0 1.6 DEC 14... 8 .74 .06 .80 .25 .25 .50 1.3 FEB • 1984 29... 10 .94 .06 1.0 .24 .36 .60 1.6 APR 24... 34 290 11 27 .62 .03 .70 .52 1.2 1.7 2.4 JUN 28... 18 .77 .03 .80 .33 .07 .40 1.2 AUG 24... 25 220 62 38 .38 .02 .40 .29 .61 .90 1.3 K = non-ideal count 242 RIO GUANAJIBO BASIN 50138000 RIO GUANAJIBO NEAR HORMIGUEROS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- 3ARIUMr CADMIUM MIUM, LEAD, MERCURY SILVER. NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- TOTAL TOTAL TOTAL ERA8LE ERABLE ERA8LE ERABLE ERA -8LE TOTAL ERABLE (MG/L (MG/L (UG/L (UG/L CUG/L (UG/L (UG/L (UG/L (UG/L CUG /L DATE AS NO3) AS P) AS AS) AS 3A) AS CO) AS CR) AS P3) AS HG) AS SE) AS AG) OCT . 1983 19... 7.1 .30 1 10) 1 50 2 <.1 <1 DEC 14... 5.3 .30 - FEB I 1 9 84 29... 7.1 .53 APR 24... 11 .69 1 195 1 ..? <1 .3 <1 <1 JUN 28... 5.3 .44 - AUG 24... 5.8 .44 CHLOR- DI- PC 3, ALORIN, DANE, ODD, DOE' DDT, AZINON. TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (US/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN • 1984 28... 1115 <.1 <.91 (.1 <.01 <.01 <.01 .01 HEPTA- METH- DI- ENDO- NE?TA- CHLOR MALA- OXY- ELORIN SULFAN, ENCRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE CUG/L) (UG/L) (UG/L) (UG/L) CUCr/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN . 1984 28... (.01 (.91 <.01 <.01 <.01 <.31 <.01 (.01 <.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION, THION, MIREX' THION, CHLOR. THANE APHENE. TRI- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION DATE (UG/L) (UG/L) (UG/L) (UG/L) CUG/L) CUG/L) (UG/L) (UG/L) JU4 . 1984 28... <.01 (.01 <.01 <.31 <.10 <.1 <1 (.01 Coaftlst be4i t Drainage boundary LARES fVe Cuiebri,es basin .‘ rt PCo Guoiotaco 14 6 6.! and 3:334, ti ASCO ',' 460 = -,0 ss, ...N., 1.. ‘ 1460 '-‘,., Ria Comuy basin -...... --,..,......." 1... 143 -,..,-. i X 45 14.\ .., .„. 1/ gi lei ) o we \ Las 1 7 Im A co o ) 14i1R3.0 T011011,0 basin N...\ S i.--\ ---•••\ "...,..,,,,,..•.,-----(,, ---..„,,, -,. .1 s, ...— C. f's 11415 Yon • ......••• 7,,,,. mom .. 141 Logo 13 Ye, Ouoita MAYA OE Z 14'25 nc (14, MARICAO taco " Coastal basin Rya Guanojibb basin a rvo Tarn Preto ‘ra Drainage baundary..\ • 'c? R(o Youca basin itia Guayoni#10 land 2 EXPLANATION A1410 SURFACE-WATER STATION AND NUMBER 2 1389 LOW-FLOW STATION AND NUMBER Y1385 QUALITY-OF-WATER STATION AND NUMBER • 45 WELL AND WELL NUMBER FA.; DO Mop onto. CALAJA% f fit aVOAMA ?KILOMETERS 4 Figure 23.--Rio Yagfiez and Rio Grande de Afiasco basins. 244 RIO YAGUEZ BASIN 50138800 RIO YAGUEZ NEAR MAYAGUEZ, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°12'31", long 67°07'07", at steel-truss bridge on unnumbered paved road about 800 ft (244 m) south of Highway 106, 1.8 mi (2.9 km) west of Highways 106 and 352 junction, and 1.4 mi (2.3 km) east-northeast from Mayaguez plaza. DRAINAGE AREA.--6.7 sq mi (17.3 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLT- STREP- SPE- DIS - JEMAND, FORM, TOCOCCI STREAM- CIFIC SOLV ED CHEM- FECAL, FECAL, FLOW, CON- PH TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- 310- DIS- CENT (HIGH UM-Mc (COLS. TIME TANEOUS ANCE ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (0EG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 103 ML) OCT , 1913 21... 3825 39 189 7.9 23.0 57 3.2 96 <10 3800 4303 DEC 15... 1335 8.0 305 3.2 23.3 1.4 3.6 130 <10 K290 720 MAR , 1984 01... 0740 2.0 311 8.1 23.5 1.1 3.3 92 <10 230 2503 APR 23... 1655 1.3 323 8.3 25.5 <1.3 3.7 108 10 K730 6503 JUN 29... 0955 9.8 304 8.3 24.0 3.5 14.3 1 7 6 14 K650 2500 AUG 29... 0750 6.6 263 3.1 23.5 3.0 7.3 92 <10 K1730 3900 HARD­ MAGNI­ SODIUM POTAS- ALKA- CHLO - FLUO- HARD- NESS, CALCIUM SIUM, SODIUM, AO­ SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR­ DIS­ DIS­ DIS­ SORP­ DIS- FIELD CIS- DIS- OIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVEO (MG/L SOLVE° SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT , 1933 21... 77 0 28 5.5 7.3 .4 2.0 34 5.9 6.2 .10 DEC 15... 137 MAR , 1934 01... 146 APR 23... 133 0 34 13 13 .5 2.3 138 10 11 .10 JUN 2 9 ... 128 AUG 29... 100 0 27 3.3 9.3 .4 2.1 111 8.4 9.4 .10 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- OI5 - CONSTI- DIS- AT 105 GEN, GEN. GEN, GEN, GEN' MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. Cr NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L 01S- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENOEJ (MG/L (MG/L (MG/L (MG/L (MG/L (MOIL (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 21... 22 120 13 20 1.3 .03 1.3 .03 .27 .30 1.6 DEC 15... 4 <.01 .80 .04 .26 .30 1.1 MAR , 1934 01... 5 <.01 .50 <.01 <.10 APR 23... 29 190 .70 <1 <.01 .20 <.01 .30 .50 JUN 29... 3 <.01 .60 .04 .16 .20 .80 AUG 29... 23 150 2.8 11 <.01 .90 .01 .19 .20 1.1 K = non-ideal count 245 RIO YAGUEZ BASIN 50138800 RIO YAGUEZ NEAR MAYAGUEZ, PR - -Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- BARIUM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELF- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV­ TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L (mG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS BA) AS CD) AS CR) AS PS) AS HG) AS SE) AS AG) OCT , 1983 21... 7.1 .36 1 200 1 50 2 <.1 <1 2 DEC 15... 4.9 .05 MAR , 1984 01... (.01 APR 23... 2.2 .J4 1 200 <1 2 <1 .1 (1 (1 JUN 29... 3.5 .04 AUG 29... 4.9 .02 246 RIO GRANDE DE ARASCO 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) north- northwest of Highways 129 and 135 junction, 2.5 mi (4 km) northeast of Castafier, 2.3 mi (3.7 km) east-southeast of Lago Guayo Dam, and 0.5 mi (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 current year. GAGE.--Water-stage recorder. Altitude of gage is about 1,530 ft (466 m) from USGS topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--24 years (1947-66, 1981-84), 37.2 cu ft/s (1.054 cu m/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, 4.4 cu ft/s (0.125 cu m/s) Apr. 23, 25, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges above base 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/s) (cu m/s) (ft) (m) Oct. 20 1545 2,810 79.6 11.35 3.459 Sept. 13 1615 3,660 104 12.10 3.688 Oct. 22 1445 1,720 48.7 10.19 3.106 Sept. 17 1615 *5,210 148 13.27 4.045 Oct. 22 1615 4,780 135 12.97 3.953 Sept. 18 1700 3,930 111 12.32 3.755 Minimum discharge, 4.4 cu ft/s (0.125 cu m/s) Apr. 23, 25. DISCHARGE, IN CUBIC FEET PER SEC040, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOY DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 19 31 27 16 9.4 9.9 8.7 6.6 16 12 17 46 2 19 28 23 15 9.0 9.5 9.1 6.4 15 11 13 188 3 16 56 21 15 8.8 9.1 8.1 6.1 108 11 11 229 4 23 269 21 13 9.0 9.0 8.7 6.1 175 13 12 80 5 16 110 20 29 8.8 8.9 7.7 5.9 58 49 13 42 6 14 58 21 15 8.1 8.9 7.3 6.0 40 18 11 39 7 13 49 20 18 8.0 8.4 7.2 6.1 29 13 9.9 29 8 12 47 20 100 10 8.1 6.9 6.2 22 12 9.6 35 9 15 39 19 30 68 8.1 6.5 6.0 19 12 9.3 44 10 17 123 18 21 28 8.3 6.3 5.8 17 11 9.0 86 11 14 109 18 19 19 8.1 6.7 6.0 53 13 8.9 166 12 25 56 20 18 19 3.0 6.5 11 101 12 9.4 110 13 22 42 19 17 15 7.8 7.8 10 42 11 11 468 14 16 59 18 17 14 7.7 6.8 7.2 26 15 8.9 138 15 17 43 18 16 12 7.9 6.2 28 21 15 9.2 80 16 62 35 18 15 12 7.9 5.9 54 27 11 8.9 90 17 96 32 18 14 11 5.5 5.7 22 22 11 8.6 549 18 41 32 19 14 11 8.3 5.4 26 19 15 8.3 574 19 26 30 17 13 11 3.1 5.3 14 19 46 8.2 244 20 269 28 17 13 11 17 5.2 9.7 17 28 8.2 311 21 120 27 19 13 10 14 5.3 14 16 17 7.8 160 22 569 26 22 12 10 9.2 5.5 80 15 17 7.7 103 23 121 25 18 12 9.9 9.7 5.0 43 15 15 7.6 79 24 56 24 17 12 10 8.5 5.0 33 14 12 7.4 67 25 41 24 17 11 10 3.4 4.9 27 13 12 17 59 26 34 23 17 11 9.9 3.4 23 27 13 11 36 53 27 30 22 17 11 9.8 8.8 18 19 13 12 25 60 28 28 22 17 11 9.7 8.6 9.5 38 12 36 13 52 29 142 21 17 10 9.8 7.7 7.5 51 12 24 13 45 30 48 31 16 9.6 --- 7.6 6.8 31 12 15 12 50 31 39 --- 16 9.5 7.5 --- 19 --- 13 41 --- TOTAL 1980 1521 585 558.1 391.2 276.1 228.5 636.1 981 523 391.9 4276 MEAN 63.9 50.7 18.9 18.0 13.5 8.91 7.62 20.5 32.7 16.9 12.6 143 MAX 569 269 27 100 68 17 ' 23 80 175 49 41 574 MIN 12 21 16 9.5 8.0 7.5 4.9 5.8 12 11 7.4 29 CFSM 4.15 3.29 1.23 1.17 .88 .58 .50 1.33 2.12 1.10 .82 9.29 IN. 4.78 3.67 1.41 1.35 .94 .67 .55 1.54 2.37 1.26 .95 10.33 AC-FT 3930 3020 1160 1110 776 548 453 1260 1950 1040 777 8480 CAL YR 1983 TOTAL 9166.2 MEAN 25.1 MAX 576 MIN 6.2 CFSM 1.63 IN 22.14 AC-FT 18180 WTR YR 1984 TOTAL 12347.9 MEAN 33.7 MAX 574 MIN 4.9 CFSM 2.19 IN 29.83 AC-FT 24490 247 RIO GRANDE DE ARMCO BASIN 50141000 RIO BLANCO NEAR ADJUNTAS, PR--Continued WATER QUALITY RECORDS PERIOD CF RECORC.--MARCH 1 946 TO OFC7M3ER 1966 IN REPORTS OF THE PUERTO RICO WATER RESOURCES AUTHORITY AS "RID YAlUECAS N2AR ADJUVTAS", JUNE 1980 TO CURRENT YEAR 4ATER-2UALITY DATA, ,CATER YEAR OCTOBER 1983 TO SEPTEMBER 1084 STREAMFLOW, SPECI7IC C(`N- TE1DERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE T:4E. INSTANTANEOUS OUCTANCE 70R7, OATE TIME INSTANTANEOUS DUCTANCE TURE (C'S) (1P0 HCS) (DEG C) (CFS) (UMHOS) CDEG C) OCT, C4 1142 23 7:7 21.0 APR, 04 0930 9.3 261 20.5 NOV, 02 1000 29 2 51 23.0 NAY, 02 1151 6.4 256 24.0 DEC, 05 1347 2C 250 23.5 JUN, 05 0943 54 196 22.5 JAN, 11 0914 19 224 19.0 JUL, 10 105) 11 242 24.0 FE1, 07 1115 3..4 241 21.5 AUG, 07 1107 0.9 239 24.0 MAR, 02 1139 9.s? 2',9 22.5 248 RIO GRANDE DE ARASCO BASIN 50141100 LAGO YAHUECAS NEAR CASTARER, 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 Castafier, 3.8 mi (6.1 km) northeast of Lago Prieto, and about 4 mi (6 km) northwest of Adjuntas. DRAINAGE AREA.--17.4 sq mi (45.1 sq km). ELEVATION RECORDS PERIOD OF RECORD.--April 1980 to current year. GAGE.--Water-stage recorder. Datum 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 hm) 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 m), and a maximum base width of 60 ft (18.3 m). 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 m) long tunnel, mostly unlined. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation, 76.61 ft (23.351 m) Sept. 13, 1982; minimum, 46.67 ft (14.225 m) Sept. 9, 1984. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 72.45 ft (22.083 m) Oct. 22; minimum, 46.67 ft (14.225 m) Sept. 9. Capacity table (elevation, in feet, and contents, in acre-feet) (based on data from Puerto Rico Water Resources Authority) 30 0 65 1,000 49 393 71 1,308 60 778 75 1,540 ELEVATION (FEET NGVD), WATER YEAR OCTO3ER 1983 TO SEPTEMBER 1934 INSTANTANEOUS OBSERVATIONS AT 2400 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 54.07 57.65 58.10 59.64 54.88 52.85 52.51 51.77 51.58 52.78 55.45 2 3 53.89 57.84 56.23 59.12 58.02 58.07 59.87 60.21 54.32 54.82 52.83 52.66 1 A 52.42 52.56 51.57 58.28 51.53 51.52 52.63 52.50 61.48 63.55 4 54.07 66.84 53.31 60.45 54.97 52.74 52.58 52.53 59.01 51.61 53.04 56.46 5 53.97 63.15 58.55 A 55.10 52.26 52.62 51.86 54.66 53.41 52.83 56.36 6 54.06 61.46 58.74 55.26 52.30 52.60 51.45 53.81 52.66 52.50 55.44 7 54.06 61.44 58.96 55.28 52.13 52.66 51.57 52.09 52.50 52.80 51.97 8 54.15 60.68 58.45 55.66 51.98 52.68 51.79 51.35 52.52 52.54 47.26 9 54.36 59.91 53.51 57.98 51.78 52.40 51.33 51.11 52.47 52.54 A 10 55.04 62.81 58.60 56.87 A 52.53 50.95 50.98 52.40 52.55 11 54.52 63.50 58.75 58.85 57.14 52.59 50.54 53.29 52.71 52.57 12 55.15 61.45 58.89 58.02 57.46 52.62 52.68 57.46 52.30 52.72 13 55.19 60.85 58.98 58.23 57.65 52.64 51.93 54.36 52.24 52.66 14 54.29 61.93 58.44 58.37 56.39 52.48 51.19 53.43 53.19 52.53 15 55.20 60.61 58.90 58.15 55.43 52.42 55.04 53.14 52.44 52.76 16 57.53 60.07 58.15 57.48 54.95 52.49 54.76 54.98 52.33 52.50 17 59.38 59.42 58.22 57.49 55.07 52.52 52.63 53.40 52.45 52.47 18 54.67 58.99 53.56 57.70 55.13 52.41 54.41 53.02 52.83 52.46 19 54.46 58.82 57.91 57.83 55.00 52.52 51.56 53.00 56.43 52.56 20 64.83 58.95 57.56 58.00 54.90 52.22 51.28 52.97 52.51 52.46 21 59.42 58.43 57.42 58.29 54.76 52.07 52.06 52.30 52.85 52.44 22 71.03 58.29 57.58 58.33 54.46 52.23 56.55 52.01 52.54 52.45 23 63.61 57.88 57.96 58.59 54.44 52.32 54.14 51.92 52.38 52.46 24 60.58 58.06 57.99 57.90 54.21 52.14 54.37 51.86 52.30 52.49 25 59.40 57.69 58.20 57.69 53.79 52.10 52.13 51.85 52.30 54.54 26 58.62 57.16 58.41 57.14 53.65 54.88 53.26 51.87 52.26 56.04 27 57.79 57.28 58.71 56.57 53.29 52.64 53.05 51.95 52.70 52.81 28 56.96 57.55 58.93 56.46 53.36 52.49 55.46 51.96 55.75 52.38 29 62.81 57.82 59.05 56.59 53.29 52.51 56.74 51.79 52.73 53.04 30 59.59 58.77 59.24 55.64 --- 52.49 53.59 51.74 52.54 52.47 31 58.90 --- 59.48 55.52 --- 53.06 52.41 56.18 MEAN 57.40 59.76 58.44 55.17 52.88 53.11 52.66 52.89 MAX 71.03 66.84 59.48 57.98 56.74 59.01 56.43 56.18 MIN 53.89 56.23 57.42 53.29 50.54 50.98 51.52 52.38 A No gage-height record. 249 RIO GRANDE DE ARASCO BASIN 50141500 LAGO GUAYO NEAR CASTARER, 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 Castaiier, and 6.0 mi (9.6 km) west of Adjuntas. DRAINAGE AREA.--9.60 sq mi (24.9 sq km). ELEVATION RECORDS PERIOD OF RECORD.--April 1980 to current year. 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 m). The ungated overflow spillway with a crest elevation of 60.00 ft (18.288 m) and a crest length of 220 ft (67.1 m) was designed to pass a maximum flood of 30,200 cu ft/s (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, 28.62 ft (8.723 m) May 2, 1984. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 60.89 ft (18.559 m) Nov. 20; minimum, 28.62 ft (8.723 m) May 2. Capacity table (elevation, in feet, and contents, in acre-feet) (based on data from Puerto Rico Water Resources Authority) 30 6,530 60 13,550 49 10,660 65 15,000 ELEVATION (FEET NGVD), WATER YEAR OCTOSER 1983 TO SEPTEMBER 1984 INSTANTANEOUS O3SERVATIONS AT 2400 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 47.68 47.90 47.96 47.76 47.12 56.51 56.26 56.40 58.51 60.35 57.72 57.59 57.76 58.11 58.40 55.11 A 50.19 49.74 49.66 49.80 49.95 35.42 34.74 B 8 37.31 37.34 38.31 41.32 42.68 41.84 40.86 40.07 40.26 40.77 41.94 42.15 41.97 42.18 42.40 6 7 8 9 10 46.48 45.79 44.89 45.24 45.61 59.87 59.56 59.11 58.62 59.40 58.39 58.72 58.08 58.32 58.41 A 55.45 56.18 56.69 49.63 48.34 47.61 47.76 47.86 43.35 43.83 43.65 43.95 44.22 41.05 41.30 41.53 41.57 40.04 41.69 40.90 41.03 40.66 40.74 11 12 13 14 15 44.40 43.76 43.58 42.24 42.36 60.35 60.26 60.37 60.39 59.67 58.58 58.57 58.86 58.15 58.03 58.75 57.93 58.15 58.25 58.06 56.99 57.29 57.51 56.26 55.22 47.22 45.48 44.03 43.13 43.29 43.83 44.10 44.84 44.87 45.16 40.04 40.47 40.35 40.44 40.94 41.03 41.17 41.07 A 55.37 55.62 58.01 58.45 58.03 16 17 18 19 20 43.24 45.39 45.38 45.04 47.78 59.37 58.77 58.45 58.10 58.35 57.78 57.91 58.22 57.32 57.10 57.43 57.46 57.65 57.84 57.98 54.73 54.91 55.00 54.80 54.69 42.96 43.12 43.26 41.55 40.81 45.61 45.95 45.30 44.71 44.97 41.01 41.17 41.40 41.19 41.17 58.67 60.82 60.54 60.09 60.68 21 22 23 24 25 51.05 55.22 58.30 58.86 58.28 58.05 57.85 57.13 57.67 56.97 57.02 57.37 57.65 57.77 58.02 58.09 56.39 56.24 56.42 55.64 54.58 54.32 54.10 53.85 53.14 40.54 40.71 39.83 38.91 38.83 8 34.21 35.77 36.39 45.11 45.34 45.56 45.50 43.29 41.52 41.85 41.09 40.48 40.71 60.45 60.34 60.29 60.04 60.19 26 27 28 29 30 31 57.71 56.72 55.80 57.42 58.60 57.77 56.30 56.73 57.11 57.42 57.41 58.26 58.49 58.71 A 55.59 54.71 54.70 54.74 54.78 54.96 52.48 52.42 52.56 51.34 --- 38.10 37.38 36.31 35.36 35.41 35.19 36.97 37.37 37.95 38.85 38.22 37.80 43.47 43.64 43.82 42.05 41.67 40.73 40.89 41.42 42.01 41.88 41.67 A 60.00 60.02 59.97 59.65 59.29 MEAN MAX MIN 49.53 58.86 42.24 58.38 60.39 56.26 - - - 43.29 50.19 35.19 - - - 43.49 45.95 37.31 41.02 42.01 40.04 A No gage-height record. B Stage beloa elevation 34.05 ft. 250 RIO GRANDE DE A8ASCO BASIN 50142500 LAGO PRIETO NEAR CASTA8ER, 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 (24.9 sq km). ELEVATION RECORDS PERIOD OF RECORD.--May 1980 to current year. 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 flashboards 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 YEAR.--Maximum elevation, 80.91 ft (24.661 m) Oct. 22; minimum, less than 52.60 ft (16.032 m) many days. Capacity table (elevation, in feet, and contents, in acre-feet) (based on data from Puerto Rico Water Resources Authority) 49 0 85 484 60 97 90 586 65 156 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1934 INSTANTANEOUS OBSERVATIONS AT 2400 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 52.19 56.63 57.79 59.60 54.58 3 54.30 55.99 58.83 63.77 2 52.17 56.24 57.65 59.73 54.62 54.47 55.96 58.76 62.70 3 53.38 56.82 57.81 60.00 54.69 55.43 56.00 58.45 64.51 4 53.23 64.05 58.16 60.12 54.30 58.19 56.06 58.21 57.69 5 52.63 60.65 58.43 59.27 55.01 56.82 57.57 58.24 55.49 6 52.63 60.13 58.47 59.49 55.20 56.84 56.29 58.10 54.71 7 52.63 59.78 53.80 59.71 55.32 56.60 55.66 57.90 54.20 3 52.63 59.26 58.14 60.42 55.56 56.49 55.46 57.70 54.49 9 52.64 59.00 53.36 59.13 56.38 56.20 55.49 57.65 59.08 10 52.64 62.93 58.48 58.87 56.79 56.17 55.58 57.59 63.65 11 52.65 60.66 58.67 58.92 57.09 56.42 56.27 53.35 61.49 12 53.65 60.47 58.54 58.00 57.39 56.92 56.09 58.11 60.38 13 52.83 60.53 58.93 58.21 57.71 56.72 55.80 57.85 66.89 14 52.67 64.59 58.22 58.30 56.49 56.35 56.53 57.55 62.49 15 52.95 59.85 58.09 58.13 55.36 56.14 56.46 57.24 64.05 16 53.58 59.53 57.85 57.49 54.79 53.73 56.16 55.96 57.06 67.76 17 64.01 58.89 57.98 57.51 54.99 54.66 56.17 55.70 56.83 78.92 18 56.38 61.04 58.27 57.71 55.09 55.75 56.15 60.48 56.66 75.41 19 56.17 58.38 57.47 57.88 54.43 53.63 56.24 62.20 56.99 73.28 20 62.74 58.53 57.17 58.10 54.76 52.87 56.22 59.21 56.96 76.34 21 64.21 58.14 57.07 58.14 54.65 54.50 56.14 58.97 56.79 71.12 22 74.11 57.95 57.43 58.34 54.40 56.31 56.07 59.02 56.63 68.87 23 65.34 57.30 57.70 58.48 54.18 54.06 56.04 58.78 56.55 67.65 24 60.65 57.74 57.79 57.85 53.93 59.65 55.99 58.58 56.46 66.83 25 58.51 57.06 58.06 57.56 53.23 53.87 56.03 58.38 59.42 66.61 26 57.92 55.74 58.33 57.02 53.17 55.99 58.28 59.78 68.22 27 56.60 56.78 58.53 56.44 52.97 55.93 58.40 59.75 69.61 28 56.15 57.15 58.77 56.33 54.84 55.91 61.56 59.10 66.92 29 60.22 57.43 58.98 56.46 55.09 55.91 59.27 58.40 65.92 30 59.61 57.63 59.18 55.50 B 54.43 55.92 58.67 58.22 65.44 31 56.66 --- 59.39 55.43 54.27 --- 58.39 60.21 --- MEAN 56.59 59.03 58.21 58.20 56.16 57.52 57.95 65.15 MAX 74.11 64.59 59.39 60.42 58.19 62.20 60.21 78.92 MIN 52.17 55.74 57.07 55.43 54.30 55.46 56.46 54.20 B Stage below elevation 52.60 ft. 251 RIO GRANDE DE ARASCO BASIN 50143000 RIO GRANDE DE ARASCO NEAR LARES, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°15'26", long 66°55'00", at bridge on Highway 124, 0.7 mi (1.1 km) downstream from confluence of Rio Blanco and Rio Prieto, and 3.7 mi (6.0 km) southwest of Lares plaza. DRAINAGE AREA.--26.3 sq mi (68.1 sq km) this does not include 36.2 sq mi (93.8 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. PERIOD OF RECORD.--Water years 1959-68, 1970 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN CCLI- STREP- SPE- DIS- DEMAND. FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- P1 TjR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- BID- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE An ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1933 28... 0905 69 285 7.8 23.0 3.7 3.1 96 14 640 980 DEC 20... 1633 35 323 8.4 25.0 33 3.4 104 <10 320 330 FEB r 1984 08... 0940 17 313 Q.2 22.0 1.0 13.0 116 <13 290 110 APR 19... 0950 11 335 3.7 26.5 2.0 14.6 184 10 16000 K180 JUN 22... 1215 100 254 3.3 26.0 25 3.3 104 12 2000 K1900 AUG 16... 1700 69 257 8.2 28.0 23 3.8 114 <10 K12000 2900 HARD­ MAGNE­ SO3IUM POTAS- ALKA- CHLO- FLUO- HARD- NESS, CALCIUM SIUM, SODIUM, AD­ SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR­ DIS­ DIS­ DIS­ SORP­ DIS- FIELD DIS- DIS- OIS- (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MS/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MGM. DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT , 1983 28... 120 18 32 3.3 11 .5 2.0 93 24 9.7 <.10 DEC 20... 122 FEB r 1984 08... 125 APR 19... 130 1 34 13 15 .6 1.5 125 27 11 <.10 JUN 22... 32 AUG 16... 95 7 26 7.4 9.8 .5 1.8 89 23 3.4 .10 SOLIDS, SOLIDS, NITRO- SILICA, SUM OF SOLIDS' RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- 015- CONSTI- DIS- AT 105 GEN, GEN, GEN. GEN, GEN, MONIA + NITRO- SOLVED TUENTS, SOLVED DEG. Co NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PEN3E0 (mG/L (MG/L (MG/L (MG/L (MG/L (MG/L (NG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT . 1983 28... 29 180 33 5 1.7 .02 1.7 .12 2.2 2.3 4.0 DEC 20... 4 <.01 1.2 <.01 3.7 4.9 FEB , 1984 08... 6 <.01 .70 .09 .41 .50 1.2 APR 19... 32 210 6.5 4 <.01 .20 .14 .36 .50 .70 JUN 22... 44 1.8 .01 1.8 <.01 <.10 AUG 16... 27 160 30 40 (.01 1.3 (.01 .30 1.6 K = non-ideal count 252 RIO GRANDE DE AfASCO BASIN 50143000 RIO GRANDE DE ARASCO NEAR LARES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CIRO- SARIUM, CADMIUM MIUM, LEAD. MERCURY SILVER, NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS. ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV­ TOTAL TOTAL TOTAL ERABLE ERASLE ERA3LE ERABLE ERA3LE TOTAL ERA2LE (MG/L (MG/L (UG/L (jG/L (UG/L (UG/L WWI (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS 3A) AS CO) AS CR) AS P3) AS MG) AS SE) AS AG) OCT 1983 28... 11 .03 1 <100 1 <1 3 (.1 <1 <1 DEC 20... 22 .09 FEB r 1984 08... 5.3 .05 APR 19... 3.1 .35 1 <103 1 <1 <1 <.1 <1 <1 JUN 22... .04 AUG 16... 7.1 .06 253 RIO GRANDE DE ARASCO BASIN 50144000 RIO GRANDE DE ARASCO 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 Marias, 5.4 mi (8.7 km) southwest of San Sebasti5n. DRAINAGE AREA.--94.3 sq mi (244.2 sq km), does not include 36.2 sq 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 m) 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.--21 years (1964-84), 309 cu ft/s (8.751 cu m/s), 44.50 in/yr (1,130 mm/yr), 223,900 acre-ft/yr (276 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 (3,965 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, 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 above base 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) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Oct. 12 1700 12,700 360 10.51 3.203 June 6 1530 13,400 379 10.78 3.286 Oct. 22 2000 *19,300 547 12.90 3.932 June 16 1730 7,110 201 7.89 2.405 Oct. 29 1645 9,250 262 8.98 2.737 Sept. 3 1845 8,670 246 8.70 2.652 Nov. 7 1900 6,500 184 7.55 2.301 Sept. 13 1900 14,500 411 11.21 3.417 June 4 2045 7,980 226 8.35 2.545 Sept. 17 2015 18,100 513 12.50 3.810 June 5 1545 6,150 174 7.35 2.240 Sept. 26 1945 12,400 343 10.37 3.161 Minimum discharge, 39 cu ft/s (1.104 cu m/s) Apr. 26. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 153 209 409 132 92 75 61 46 184 251 181 1040 2 155 178 294 123 91 94 65 48 155 211 186 1320 3 124 218 252 123 88 74 60 50 136 206 177 1970 4 187 637 243 128 90 76 60 64 1300 246 215 993 5 264 535 231 140 92 70 59 100 1700 914 278 774 6 394 386 229 145 90 67 54 55 2090 332 183 493 7 322 1390 235 139 94 69 53 50 702 228 161 386 3 622 586 226 646 101 66 53 54 460 197 185 800 9 511 722 226 446 121 68 67 120 448 178 181 784 10 522 616 217 199 169 66 52 60 463 404 197 899 11 463 645 215 154 141 66 48 56 603 447 218 1400 12 2020 444 270 141 108 64 47 56 845 266 633 1510 13 759 342 207 148 124 63 47 87 767 199 264 3710 14 385 933 177 134 186 62 45 67 454 177 338 2490 15 246 927 201 128 133 59 46 58 319 173 540 1570 16 685 424 175 142 108 60 47 337 1280 162 388 1350 17 1070 356 168 118 95 61 46 323 644 155 234 3840 18 945 331 172 116 88 63 47 342 706 357 193 3300 19 406 597 163 111 86 59 53 432 577 738 331 2020 20 901 346 164 108 82 59 47 307 354 1220 303 2080 21 1560 654 246 107 82 60 46 380 857 566 185 1720 22 2840 457 168 104 77 91 46 634 449 372 170 1230 23 1320 374 162 104 76 98 46 546 438 458 161 1010 24 449 326 153 102 75 70 44 1050 354 303 148 830 25 303 310 148 98 75 62 43 745 463 258 248 669 26 235 286 190 98 73 71 56 426 340 232 575 1680 27 188 276 204 97 73 65 190 946 687 215 351 775 28 162 274 144 96 71 61 67 1030 354 227 246 797 29 1760 257 137 96 70 60 54 623 257 214 208 681 30 569 284 133 94 --- 58 47 398 230 193 193 551 31 262 --- 132 94 --- 59 --- 242 --- 180 633 --- TOTAL 20782 14320 6291 4621 2851 2096 1696 9732 18616 10284 8504 42672 MEAN 670 477 203 149 98.3 67.6 56.5 314 621 332 274 1422 MAX 2840 1390 409 646 186 98 190 1050 2090 1220 633 3840 MIN 124 178 132 94 70 58 43 46 136 155 148 386 CFSM 7.11 5.06 2.15 1.58 1.04 .72 .60 3.33 6.59 3.52 2.91 15.1 IN. 8.20 5.65 2.48 1.82 1.12 .83 .67 3.84 7.34 4.06 3.35 16.83 AC-FT 41220 28400 12480 9170 5650 4160 3360 19300 36920 20400 16870 84640 CAL YR 1983 TOTAL 92602 MEAN 254 MAX 2840 MII 53 CFSM 2.69 IN 36.53 AC-FT 183700 NTR YR 1984 TOTAL 142465 MEAN 389 MAX 3840 MIN 43 CFSM 4.13 IN 56.20 AC-FT 282600 254 RIO GRANDE DE A8ASCO BASIN 50144000 RIO GRANDE DE ARASCO 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 1983 TO SEPTEMBER 1984 OXYGEN. COLI- STREP- SPE- ors- FORM, TOCOCCI STREAM- CIFIC SOLVED FECAL, FECAL, HARD-- FLOW. CON- 04 TJR- OXYGEN, (PER- 0.7 KE AGAR NESS INSTAN- DUCT- (STAND- TEMPER- e:c- DIS- CENT UM-MF (COLS. (MG/L TIME TANEOUS ANCE ARD ATURE ITT SOLVED SATUR (COLS./ PER AS DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) (MG/L) ATION) 100 ML) 100 ML) CAC03) OCT . 1953 05... 1215 214 198 8.0 25.0 123 3.3 132 24000 29000 80 FEB . 1934 03... 1300 87 235 8.2 25.3 2.4 9.2 111 2400 62 110 JUN 07... 1335 568 190 7.6 24.0 55 3.7 134 3703 K120.30 75 AUG 01... 1500 130 231 3.0 27.0 2.0 3.8 110 43 76 99 HARD­ MAGNE­ SODIUM POTAS- ALKA- CHLO- FLUO- SILICA. NESS, CALCIUM SIUM. SODIUM. AO- SIUM. LINITY SULFATE RIDE. RIDE. DIS- NONCAR­ DI S­ DIS­ DIS­ SORP- DIS- FIELD DIS- DIS- DIS- SOLVED DATE 30NATE (MG/L CAC03) SOLVED (MG/L AS C A) SOLVED (MG/L AS MG) SOLVED (MI/L AS NA) TION RATIO SOLVED (Mi/L AS K) (MG/L SOLVED AS (MG/L CAC03) AS SO4) SOLVED (MG/L AS CL) SOLVED (MG/L AS F) (MG/L AS 5IO2) DCT , 1933 05... 0 20 7.3 7.9 .4 1.7 80 9.2 5.8 <.10 23 FEB , 1934 08... 0 27 9.7 1) .4 1.4 107 12 7.9 .10 26 JUN 07... 9 19 6.6 5.6 .3 1.6 66 12 5.8 <.10 24 AUG 01... 1 25 8.9 7.1 .4 1.4 93 10 7.0 <.10 31 SOLIDS, SOLIDS. NITRO- NITRO- NITRO- NITRO- PHOS- RESIDUE SUM OF SOLIDS, GEN, GEN. GEN, GEN.AM- PHOS- PHORUS, AT 180 CONSTI- on- NO2+NO3 AMMONIA AMMONIA MONIA + PHOS- PHORUS. ORTHO, DEG. C TUENTS, SOLVED DIS- DIS- On- ORGANIC PHORUS, DIS- DIS- DIS- DIS- (TONS SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED SOLVED SOLVED SOLVED PER (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE (MG/1) (MG/L) DAY) AS N) AS N) AS NH4) AS N) AS P) AS P) AS P) OCT r 1983 05... 132 120 76 .00 .00 .00 .00 .00 .00 .00 FEB , 1984 08... 166 160 37 .54 <.01 .60 .06 .04 .02 JUN 7... 137 120 210 1.5 .07 .09 2.4 .09 .04 .03 AUG 01... 155 150 75 .49 <.01 <.10 <.01 <.01 .03 PHOS- PHATE, ALUM- BERYL- CHRO- ORTHO, INUM, ARSENIC BARIUM' LIUM. CADMIUM MIUM, COBALT. COPPER, IRON. DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS PO4) AS AL) AS AS) AS 3A) AS BE) AS CD) AS CR) AS CO) AS CU) AS FE) OCT , 1983 05... .00 20 2 49 <.5 <1 <1 <3 1 50 FEB ' 1984 8... .06 10 1 45 <.5 <1 <1 <3 1 11 JUN 07... .09 70 1 44 <.0 <1 1 <3 2 26 AUG 01... .09 30 <1 45 1 <1 <1 <3 <1 13 K = non-ideal count 255 RIO GRANDE DE A!ASC0 BASIN 50144000 RIO GRANDE DE ARASCO NEAR SAN SEBASTIAN, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE LEAD. 015- SOLVED (UG/L AS P8) LITHIUM DIS- SOLVED . (UG/L AS LI) MANGA- NESE, DIS- SOLVED {UG/L AS MN) MERCURY DIS- SOLVED (UG/L AS HG) MOLYB- DENUM, DIS- SOLVED (UG/L AS MO) NICKEL, DIS- SOLVED (UG/L AS VI) SELE - NIUM. DIS- SOLVED (UG/L AS SE) SILVER, DIS- SOLVED (UG/L AS AG) STRON- TIUM, DIS- SOLVED (UG/L AS SR) VANA- DIUM, DIS- SOLVED (UG/L AS V) OCT . 1983 05... FEB , 1984 08... JUN 07... AUG 01... 1 3 3 <1 <4 <4 <4 <4 16 17 16 22 <.1 <.1 <.1 <.1 20 <10 <10 <10 1 3 2 <1 <1 <1 <1 <1 <1 <1 <1 <1 110 140 110 130 <6 7 <6 <6 DATE TIME STREAMFLOW. INSTANTANEOUS (CFS) SPECIFIC CON­ DUCTANCE CUMHOS) TEMPERA­ TURE (DEG C) DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA­ TURE (DEG C) DEC. JAN. MAR. 06 1645 03 1328 05 1425 229 131 72 230 233 231 25.0 24.5 25.5 APR. MAY, 03 1215 01 1426 59 47 242 238 27.0 23.5 DATE STREAM­ FLOW. INSTAN- TIME TANEOUS (CFS) SEC. SUSP. SEDI- SIEVE MENT, DIAM. SUS- X FINER PENDED THAN (MG/L) .062 MM OCT , 1933 05... 1215 FES , 1984 08... 1300 JUN 07... 1335 AUG 01... 1300 1... 1500 2... 1240 214 37 558 130 130 37 214 12 96 129 12 98 100 96 100 -- 100 256 RIO GRANDE DE ARASCO BASIN 50146000 RIO GRANDE DE ARASCO NEAR ARASCO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°16'00", long 67°08'05", at bridge on Highway 430, 0.2 mi (0.3 km) south of Highway 109 at a El Espino and 1.4 mi (2.3 km) east-southeast from Afiasco plaza. DRAINAGE AREA.--139 sq mi (360 sq km) this does not include 39.7 sq mi (102.8 sq km), flow is diverted to south coast. PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLE- STREP- SPE­ DES- DEMAND. FORM. TCCOCCI STREAM­ CIFIC SOLVED CHEM- FECAL, FECAL. FLOW, CON­ P4 TjR- OXYGEN. (PER- ICAL 0.7 KF AGAR INS TAN- DUCT'• (STAND- TEMPER- BED- OIS- CENT (NIGH UM-MF (COLS. TIME TANEOUS ANC:: ARD A TURE ITY SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMMOS) UNITS) (0EG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT o, 1983 21... 1115 E600 163 7.6 24.0 22) 3.2 46 12 23000 33000 DEC 16... 1000 217 248 7.9 23.0 13 7.6 83 <10 K630 FE3 , 1984 9... 0900 140 232 7.8 24.0 12 7.9 92 15 2930 750 MAY 10... 1820 67 236 8.1 28.1 95 9.2 107 (10 240 K170 JUN 29... 1700 319 234 8.0 27.5 2) 17.4 220 14 K770 260 AUG 23... 1820 331 212 8.0 23.0 5) 7.1 91 12 2300 K1400 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO MARL)... NESS. CALCIUM S/UM, SODIUM, AO- SIUM, LINITY SULFATE RIDE, RIDE. NESS NONCAR- DIS- DIS- DIS- SORP- DIS". FIELD 01S- DIS- OIS- (MG/L 30NATE SOLVED SOLVED SOLVED TroN SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MS/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT , 1983 21... 66 2 17 5.7 6.1 .3 1.7 64 10 5.1 <.10 DEC 16... 105 FEB r 1984 9... 102 MAY 10... 97 2 24 3.9 9.1 .4 1.4 98 15 7.3 .10 JUN 29... 94 AUG 28... 80 0 20 7.2 7.7 .4 1.7 84 9.2 6.3 .10 SOLIDS, SOLIDS. NITRO- SILICA. SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM DIS- CONSTI- On- AT 105 GEN, GEN, GEN. GEN, GEN, MONZA + NITRO- SOLVED TUENTS, SOLVED DEG. C. NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENOED (4G/L (M3/L (MG/L CMG/L (MG/L (MG/L (MG/L DATE $102) (MG/L) DAY) (MS/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 21... 22 110 278 1.5 .04 1.5 .09 .91 1.0 2.5 DEC 16... 33 .89 .01 .90 .03 .17 .20 1.1 FEB , 1984 9... 9 .49 .01 .50 1.0 .40 1.4 1.9 MAY 10... 26 150 27 210 .18 .02 .20 .29 3.8 4.1 4.3 JUN 29... 34 <.01 .70 .04 .26 .30 1.0 AUG 28... 25 130 114 94 .89 .01 .90 .04 .46 .50 1.4 E = estimate K = non-ideal count 390 257 RIO GRANDE DE ARASCO BASIN 50146000 RIO GRANDE DE ARASCO NEAR ARASCO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 C4R0- 5ARIJM, CADMIUM MIUM, LEAD, MERCURY SILVER, NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- REGOV- RECOV- NIUM, RECOV­ TOTAL TOTAL TOTAL ERA3LE ERABLE ERA3LE ERABLE ERABLE TOTAL ERA3LE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS P) AS AS) AS IA) AS CO) AS CR) AS P3) AS HG) AS SE) AS AG) OCT , 1 9 8. 3 21... 11 .20 1 100 2 23 11 <.1 <1 3 DEC 16... 4.9 .36 FEB , 1984 9... 3.4 .35 MAY 10... 19 .34 1 107 3 1? 4 <.1 <1 <1 JUN 29 ... 4.4 .03 AUG 28... 6.2 .34 7,HLOR- DI- PCS, ALORIN, 0A4Er 003, DDE, DDT, AZINON, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN • 1984 29... 1700 (.1 <.31 <.1 <.01 <.01 <.01 <.01 HEPTA- METH- DI- ENDO- HEPTA- CHLOR MALA- OXY- ELDRIN SULFAN, ENDRIN, ETHION, :HLOR, EPDXIDE LINOANE THION, CHLOR, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN • 1984 29... <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 NAPH­ THA­ METHYL METHYL LINES, PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION, THION. MIREX, THION, CHLOR. THANE APHENE, TRI- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN r 1984 29... <.01 (.01 <.01 <.01 <.10 <.1 <1 <.01 A(UADit.LA 14 st'r0 6unyabc 1464 ---••••—•• • tAcw DA ,b8 1466 4% 1491_ 'A MOCAR / if ‹,,,,,,,,, (­ --" i 6.1 ".i bdo {- ,ra N., .,--...,. a' •••,.....( .... de Drainage boundary uncertain •• p/ r Ri C N \ .Z• 8%AN SERASTAPA CoostoE Darin Coartoi oorin RA, Groner de Masco basin • c.•• c.' Rio Guojatco basin LARES I ZOrainage 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 May ar ea ! rroao,i--------, \ A. ------7,-etLfi., ,.....„, .. '-'4 *.RE C eo FA.) A RDA LI,,ttitA* i;E Z C MiLi A 6, 4. ts...: 9!CE4, ...., flUAVAMA ?KH..OSIETERS Figure 24.--Rio Culebrinas basin. -- 260 RIO CULEBRINAS BASIN 50147600 RIO CULEBRINAS NEAR SAN SEBASTIAN, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°20'51", long 67°02'40", at bridge on Highway 423, 1.3 mi (2.1 km) south of Quebrada El. Salto Bridge on Highway 111, and 2.1 mi (3.4 km) west of Central La Plata. DRAINAGE AREA.--58.2 sq mi (150.7 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI STREP". SPE- On- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PM TJR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- 810- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARD ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHJS) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1983 27... 0955 151 287 3.0 23.5 13 7.9 93 12 4400 3400 DEC 21... 0856 105 234 7.9 22.5 70 7.7 39 15 48000 52000 FEB , 1984 08... 1615 42 282 74.0 24.0 2.5 4.8 57 15 >60000 8900 APR 19... 1525 17 475 1.2 21.0 13 8.3 113 27 X7400 350 JUN 22... 1900 299 309 8.1 25.0 34 7.7 95 <10 25000 4700 AUG 17... 1130 170 242 1.0 25.5 25) 3.0 98 <10 K140000 24000 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO.". HARD- NESS, CALCIUM SUM, SODIUM, AO- SUM, L/NITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- DIS- DIS- SORP- On- FIELD DIS- DIS- BIS.'" (MG/L BONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MI/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CAC03) CAC03) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT r 1983 27... 120 2 40 4.9 10 .4 1.8 117 12 10 .10 DEC 21... 37 FE8 • 1984 08... 114 ...... APR 19... 140 0 44 7.5 32 1 13 175 23 24 <.10 JUN 22... 123 AUG 17... 99 1 34 3.5 6.7 .3 2.2 98 16 7.9 .10 SOLIDS, SOLIDS, NITRO". SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO". NITRO"' NITRO- GEN,AM DIS- CONSTI- DIS- AT 105 GEN, GEN. GEN, GEN, GEN, MONIA + NITRO'''. SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENOED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE 5102) (MG/L) DAY) (MS/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT • 1953 27... 23 180 72 18 1.4 .03 1.4 .15 .25 .40 1.8 DEC 21... 8 1.5 .04 1.5 .02 .08 .10 1.6 FEB 1984 08... 21 .19 .01 .20 .08 2.6 2.7 2.9 APR 19... 38 290 13 20 .75 .15 .90 .64 .86 1.5 2.4 JUN 22... 50 1.2 .02 1.2 .02 <.10 AUG 17... 15 140 68 320 1.1 .07 1.2 .13 .97 1.1 2.3 K = non-ideal count 261 RIO CULEBRINAS BASIN 50147600 RIO CULEBRINAS NEAR SAN SEBASTIAN, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE NITRO- GEN, TOTAL (MG/L AS NO3) PMCS­ PHORUS. TOTAL (MG/L AS P) ARSENIC TOTAL (UG/L AS AS) WZIUM. TOTAL RECOV­ ERABLE (UG/L AS AA) CADMIUM TOTAL RECOV­ ERABLE (UG/L AS CI) CHRO­ MIUM, TOTAL RECOV­ ERA3LE (UG/L AS CR) LEAD, TOTAL RECOV­ ERA:3LE (UG/L AS P3) MERCURY TOTAL RECOV­ ERASLE (UG/L AS HG) SELE - NIUM, TOTAL (UG/L AS SE) SILVER' TOTAL RECOV­ ERA3LE (UG/L AS AG) OCT , 1485 27... 8.0 DEC 21... 7.1 FEB , 1984 08... 13 APR 19... 11 JUN 22... AUG 17... 10 .04 .13 .16 .59 .37 .12 1 3 (100 10) 1 1 1 <1 3 1 (.1 .5 <1 <1 <1 <1 262 RIO CULEBRINAS BASIN 50147800 RIO CULEBRINAS AT HIGHWAY 404 NEAR MOCA, PR LOCATION.--Lat 18°21'42", long 67°05'33", Hydrologic Unit 21010003, on right bank, at bridge on Highway 404, 0.3 mi (0.5 km) downstream from Quebrada Yagruma, and 2.8 mi (4.5 km) southeast of Moca. DRAINAGE AREA.--71.2 sq mi (184.4 sq km). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--July 1967 to current year. GAGE.--Water-stage recorder. Altitude of gage is 45 ft (13.7 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--17 years (1968-84), 300 cu ft/s (8.496 cu m/s), 57.22 in/yr (1,453 mm/yr), 217,400 acre-ft/yr (268 cu hm/yr); median of yearly mean discharges, 286 cu ft/s (8.10 cu m/s), 207,000 acre-ft/yr (255 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 69,000 cu ft/s (1,954 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, 16 cu ft/s (0.453 cu m/s) Apr. 17-19, 1979. EXTREMES FOR CURRENT YEAR.--Peak discharges above base of 11,300 cu ft/s (320 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. 7 1845 14,300 405 23.81 7.257 Sept. 15 1930 *26,700 756 28.03 8.544 Oct. 8 1915 12,000 340 22.80 6.949 Sept. 16 1615 13,900 394 23.65 7.208 June 5 1900 24,400 691 27.36 8.339 Sept. 17 1845 14,300 405 23.79 7.251 June 19 1830 12,400 351 22.96 6.998 Sept. 18 1800 16,800 476 24.82 7.565 Sept. 1 1830 12,000 340 22.78 6.943 Sept. 26 2400 12,500 354 22.98 7.004 Sept. 14 2200 12,300 348 22.93 6.989 Minimum discharge, 21 cu ft/s (0.595 cu m/s) Apr. 25,26. DISCHARGE, IN CUBIC FEET PER SECONIOr WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 179 173 123 74 48 43 38 30 126 224 94 2250 2 234 165 114 66 47 60 41 26 104 165 94 314 3 176 242 106 64 46 47 39 29 95 151 89 460 4 170 531 100 63 46 45 35 55 340 831 105 810 5 374 312 98 66 47 40 35 101 5320 1810 143 292 6 325 535 95 63 47 40 33 50 1550 335 99 249 7 2690 733 93 64 57 37 37 39 1830 243 35 195 8 2280 303 95 84 54 40 49 32 744 213 88 179 9 924 280 90 85 49 41 33 67 1050 192 196 166 10 409 221 89 63 44 40 33 44 451 548 114 293 11 305 214 87 58 44 38 31 41 328 303 105 568 12 597 199 85 56 44 34 30 55 243 227 204 533 13 458 172 85 91 58 35 29 41 481 185 344 601 14 279 375 82 143 108 35 72 70 291 168 251 2530 15 235 313 81 89 74 34 95 45 196 160 374 6920 16 275 171 78 79 66 34 43 81 324 151 388 4720 17 221 158 75 77 61 33 32 475 262 143 421 3940 18 1600 153 75 68 56 35 34 416 1840 146 198 4360 19 1030 162 73 63 53 33 31 236 2320 156 148 942 20 852 328 86 61 52 29 33 282 522 406 166 564 21 442 185 138 62 48 54 33 1770 1500 201 133 441 22 555 175 81 60 50 83 30 476 534 143 141 368 23 338 141 74 59 48 99 27 257 321 133 144 1510 24 323 134 77 56 46 86 25 161 449 123 119 410 25 265 129 72 57 47 43 26 153 430 116 110 303 26 228 124 73 55 51 44 135 493 402 110 625 1190 27 296 120 116 54 46 45 227 506 331 105 339 1570 28 204 116 89 53 45 43 55 410 242 108 183 731 29 404 111 73 51 44 39 40 285 201 121 141 443 30 246 109 69 50 --- 39 32 172 180 105 130 334 31 212 --- 76 50 36 --- 151 --- 98 443 --- TOTAL 17126 7094 2748 2089 1526 1389 1433 7049 23057 8125 6214 38191 MEAN 552 236 88.6 67.4 52.6 44.8 47.8 227 769 262 200 1273 MAX 2690 738 138 148 108 99 227 1770 5320 1810 625 6920 MIN 170 109 69 50 44 29 25 26 95 98 85 166 CFSM 7.75 3.32 1.24 .95 .74 .63 .67 3.19 10.8 3.68 2.81 17.9 IN. 8.95 3.71 1.44 1.09 .80 .73 .75 3.68 12.05 4.25 3.25 19.95 AC-FT 33970 14070 5450 4140 3030 2760 2840 13980 45730 16120 12330 75750 CAL YR 1983 TOTAL 81893 MEAN 224 MAX 3880 MIN 19 CFSM 3.15 IN 42.79 AC-FT 162400 MIR YR 1984 TOTAL 116041 MEAN 317 MAX 6920 MIN 25 CFSM 4.45 IN 60.63 AC-FT 230200 RIO CULEBRINAS BASIN 50147800 RIO CULEBRINAS AT HIGHWAY 404 NEAR MOCA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMMOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 05 0952 152 227 24.5 MAR, 06 0937 38 276 23.0 NOV, 08 1407 195 254 25.5 APR, 05 1011 38 265 25.0 DEC. 07 0940 91 241 23.0 MAY, 03 1257 28 318 27.0 JAN, 12 0920 58 232 23.5 JUL. 11 1338 246 224 26.5 FEB' 08 1413 58 242 24.5 AUG, 08 1802 90 224 28.0 263 264 RIO CULEBRINAS BASIN 50149100 RIO CULEBRINAS NEAR AGUADA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°24'03", long 67°09'40", at bridge on Highway 2, and 2.3 mi (3.7 km) northeast of Aguada plaza. DRAINAGE AREA.--97.0 sq mi (251.2 sq km). PERIOD OF RECORD.--Water years 1958, 1970 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, OXYGEN COLI- STREP- SPE- OIS- DEMAND. FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL. FECAL, FLOW, CON- P4 TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- TEMPER- SID- DIS- CENT (HIGH UM-MF (COLS. TIME TANEOUS ANCE ARD ATURE ITT SOLVED SATUR- LEVEL) (COLS./ PER DATE (CFS) (UMHOS) UNITS) (DEG C) (NTU) CMG/L) ATION) (MG/L) 100 ML) 100 ML) OCT , 1983 27... 1345 280 318 7.8 25.5 33 7.2 38 10 K15000 K10300 DEC 21... 1230 236 295 7.7 24.5 203 7.2 86 10 3800 2500 FES , 1984 09... 1225 68 364 6.7 27.0 11 4.5 56 130 35000 K1200000 MAY 13... 1450 47 385 7.9 23.0 3.8 6.1 12 30000 K16000 JUN 21... 1950 1230 259 7.9 25.0 203 6.7 81 20 50000 29000 AUG 17... 1830 498 244 3.0 26.0 283 6.7 83 21 >60000 K110000 HARD- MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO." HARD.- NESS. CALCIUM SIUM, SODIUM. AD- SIUM, LINITY SULFATE RIDE, RIDE, NESS NONCAR- DIS- DIS." ()TS- SORP- DIS- FIELD DIS- DIS- On- (MG/L SONATE SOLVED SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED AS (MG/L (MG/L (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L DATE CACO3) CACO3) AS CA) AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) OCT , 1983 27... 130 2 45 5.4 12 .5 2.1 133 10 11 .10 DEC 21... 116 FEB , 1984 9... 146 MAY 10... 140 0 47 6.4 20 .8 4.3 150 21 17 .20 JUN 21... 103 AUG 17... 94 0 32 3.4 7.2 .3 2.2 108 18 9.9 .10 SOLIDS, SOLIDS, NITRO... SILICA. SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO... NITRO- NITRO- GENsAM- DIS- CONSTI... DIS- AT 105 GEN, GEN. GEN. GEN, GEN. MONIA + NITRO- SOLVED TUENTS' SOLVED DEG. Cr NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L DATE SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT , 1983 27... 27 190 146 62 1.1 .03 1.1 .34 .36 .70 1.8 DEC 21... 5 1.2 .04 1.2 .05 .45 .50 1.7 FEB ' 1984 9... 28 .37 .03 .40 .29 1.8 2.1 2.5 MAY 10... 31 230 34 .74 .06 .80 .59 2.8 3.4 4.2 JUN 21... 1270 .64 .06 .70 .14 .26 .40 1.1 AUG 17... 14 150 204 1800 .64 .16 .80 .25 2.1 2.3 3.1 K = non-idoal count 265 RIO CULEBRINAS BASIN 50149100 RIO CULEBRINAS NEAR AGUADA, PR - -Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHRO- BARIUM, CADMIUM MIUM• LEAD• MERCURY SILVER, NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL SELE". TOTAL GEN• PHORUS• ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV NIUM• RECOV­ TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE (MG/L (MGIL (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L DATE AS NO3) AS a) AS AS) AS BA) AS CO) AS CR) AS P3) AS HG) AS SE) AS AG) OCT • 1983 27... 8.0 .07 1 <100 1 2 6 <.1 <1 <1 DEC 21... 7.5 .10 FES • 1984 9... 11 .18 MAY 10... 19 .23 2 10J 2 <1 10 .1 <1 <1 JUN 21 ... 4.9 .09 AUG 17... 14 .17 CHLOR- DI- PCB, ALDRIN, ANE, DOD, DDE, DOT• AIINON• TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN • 1984 21... 1950 <.1 (.01 <.1 <.01 (.01 <.01 <.01 HEPTA... METH- DI- ENDO- HEPTA- CHLOR MALA- OXY••• ELORIN SULFAN, ENDRIN, ETHION• CHLOR• EPDXIDE LINDANE THION• CHLOR• TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN • 1984 21... <.01 <.01 <.01 (.01 <.01 (.01 <.01 <.01 <.01 NAPH..- THA- METHYL METHYL LENES, PARA-. TRI- PARA- POLY- PER- TO)fr TOTAL THION• THION• MIREEX• THION• CHLOR. THANE APHENE• TRI* TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN • 1984 21... <.01 (.01 <.01 <.01 <.10 <.1 <1 (.01 267 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-floe 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 from 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 oartial-records stations during water year 1984 PUBLICATION RECORD STATION NUMBER STATION NAME LOCATION AND BASIN DRAINAGE AREA sq mi (sq km) DATE TIME STREAM- SPE- TEMPER- FLOW CIFIC CONDUC- ATURE cfs TANCE (cms) umhos deg C Quebrada de los Cedros basin 50007000 Quebrada de los Cedros near Isabela, PR Lat 13 30 46, long 67 05 47 Hydrologic unit 21010002. On dirt road, 4.7mi (7.6km) west of Isabela, and 3.5 mi (0.8 km) upstream from mouth. 6.91 (17.90) 3/27/84 DRY Rio Guajataca basin 50011400 Rio Guajataca above Let 13 28 31, long 66 57 46 mouth near Quebradillas, Hydrologic unit 21010)02. PR At ford, 1.7 mi (2.7 km) up- stream from bridge on Hwy 2, 2.1 mi (3.4 km) from the 23.7 3/27/84 1340 8.01 564 26.0 Atlantic Ocean, 6.6 mi (61.4) (0.23) (10.6 km) downstream from Lego Guajataca, and 1.6 mi (2.6 km) west of Quebradi- llas. Rio Camuy basin 50015800 Rio Camuy at Capaez, PR Lat 13 27 49, long 66 49 58 Hydrologic unit 21010002. At 1.1 iii (1.7 km) south of Purification Plant of Heti- 22.0 3/26/84 No Meas llo, about 1.4 mi (2.2 km) (57.0) south of Hwy 2, and 1.8 mi (2.9 km) upstream from mouth. Rio Cibuco basin 50039000 Rio Indio near Vega Baja, Lat 18 26 19, long 66 22 13 PR Hydrologic unit 21010002. At bridge on Hwy 160, 0.6 mi 26.7 3/23/54 1450 6.86 456 27.0 (1.0 km) upstream from Rio (69.2) (0.19) Cibuco, and 1.2 mi (1.9 km) southeast of Vega Baja. Rio de la Plata basin 50045800 Rio Lajas at Toe Alta, Let 18 23 39, long 66 15 16 PR Hydrologic unit 21010005. At bridge on Hwy 165, 0.2 mi (0.3 km) upstream from 8.60 3/29/84 1128 1.39 649 25.5 Rio de la Plata, and 3.5 mi (22.27) (0.04) (0.8 km) northwest of Toe Alta. 268 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM- SPEC- TEMPER- NUMBER NAME AND AREA sq mi DATE TIME FLOW cfs CIFIC CONDUC- TANCE ATURE BASIN (sq km) (cms) umhos deg C Rio Hondo basin 50047502 Rio Hondo at Bayamon, PR Let 18 23 51, long 66 )9 22 Hydrologic unit 21010005. At bridge on Hwy 2, 700 ft (213 m) east of Hwy 2 and Calle Parque intersection, and 3.7 mi (1.2 km) south of sewage treatment plant. 7.59 (19.66) 3/29/84 1330 6.29 888 (0.18) 27.0 50047504 Quebrada Santa Catalina at Bayamon, PR Lat 18 24 05, long 65 )9 43 Hydrologic unit 21010005. 700 ft (213 m) downstream from bridge on Hwy 2 and 0.2 mi (0.3 km) upstream from mouth. 2.50 (6.47) 3/30/84 0939 1.35 987 (0.04) 26.5 50047503 Cano de Quebrada Catalina at Bayamon. PR Lat 18 24 27. long 66 09 33 Hydrologic unit 210100)5. At bridge on new Hay 167. 0.7 mi (1.1 km) north of Hwy 2 and Calle Parque intersec- tion, and 0.2 mi (0.3 km) upstream from sewage treat- ment plant. 0.65 (1.68) 3/29/84 No Flow 50047525 Rio Hondo II near Bayamon. PR Lat 18 25 19. long 66 10 38 Hydrologic unit 21010005. At bridge on Hwy 872 and 0.7 mi (1.1 km) downstream from bridge on Hwy 22. 3.18 (3.24) 3/30/84 1024 1.43 658 (0.04) 27.5 Rio de Bayamon basin 50048510 Rio de Bayamon at Flood Channel at Bayamon. PR Lai 18 24 29, long 66 39 04 Hydrologic unit 21010005. At bridge on Hwy 890, 1.0 mi (1.6 km) downstream from bridge on Hwy 2. and 3.2 mi (5.1 km) upstream from mouth. 73.2 (189.6) 3/30/84 0343 18.2 (0.52) 470 26.0 Rio Puerto Nuevo basin 50049000 Rio Piedras at Rio Piedras, PR Let 18 23 48, long 66 03 24 Hydrologic unit 21010005. On left bank, at bridge on Hwy 1, 0.3 mi (0.5 km) southwest of Rio Piedras Plaza, and 0.4 mi (0.6 km) downstream from diversion 12.5 (32.4) 3/29/84 1153 5.96 (0.17) 437 27.5 for water supply. 50049310 Quebrada Josefina at Pinero Avenue, PR Lat 18 24 33, long 66 04 36 Hydrologic unit 21010005. At bridge on Pinar° Ave, and 0.4 mi (0.6 km) upstream from junction with Rio Pie- dram. 19.0 (49.2) 3/29/84 1321 8.50 (0.24) 426 32.0 50049600 Quebrada Margarita at Caparra Heights, PR Let 18 24 33, long 66 06 18 Hydrologic unit 21010095. At bridge on Franklin 0. Roosevelt Ave, at San Pa- tricio Plaza and Fort Bu- channan interchange with Hwy 2, and 0.1 mi (0.2 km) south of Caparra Heights. 1.82 (4.71) 3/29/84 No Naas 269 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION NUMBER STATION NAME LOCATION AND BASIN DRAINAGE AREA sq mi (sq km) DATE TIME STREAM- SPE- FLOW CIFIC CONDUC- cfs TANCE (cms) umhos TEMPER- ATURE deg C Quebrada Blasina basin 50050300 Quebrada Blasina near Carolina, PR Lat 18 23 27, long 65 58 23 Hydrologic unit 21010005. At bridge on Hwy 3, 1.4 mi (2.3 km) south of Valle A­ rriba Heights, and 1.2 mi (1.9 km) west-southeast of Carolina. 2.96 (7.67) 3/26/84 1000 5/07/84 1134 4.71 533 (0.13) 4.97 710 (0.14) 27.5 29.0 Rio Grande de Loiza basin 50051010 Rio Grande de Loiza Let 18 07 23, long 65 59 18 3/27/84 1020 15.8 141 25.5 below Rio Emajagua, PR Hydrologic unit 21010015. 12.2 (0.45) 200 ft (61 m) below junc­ (31.6) tion with Rio Emajagua and 400 ft (122 m) north of Hwy 181 and Hwy 745 intersection. 5/09/84 1034 11.4 163 (0.32) 27.0 50051140 Rio Grande de Loiza at Lat 18 09 29, long 65 58 48 Jagual, PR Hydrologic unit 21010035. 200 ft (61 m) east of Jagual 17.8 3/27/84 1138 19.2 157 (0.54) 26.0 School on Hwy 181 and 1.7 mi (2.8 km) above junction with Rio Cayaguas. (46.1) 5/09/84 1152 14.7 172 (0.42) 29.5 50052300 Rio Grand. die Loiza at Lat 18 11 39, long 65 57 46 San Lorenzo North, PR Hydrologic unit 21010005. 3/27/84 1342 37.1 182 30.5 Above sewage treatment plant 46.0 (1.05) on north side of San Lorenzo, (119.1) 0.2 mi (0.3 km) northwest of the plaza, and 1.6 mi (2.6 km) downstream from Rio Cayaguas. 5/08/84 1352 18.7 277 (0.53) 33.0 50052700 Rio Grande de Loiza at Hwy 183, PR Lat 18 12 22. long 65 59 23 Hydrologic unit 21010035. 2.1 mi (3.4 km) northwest of 50.9 3/27/84 1446 39.0 211 (1.10) 31.0 Plaza de San Lorenzo and 1.8 mi (2.9 km) downstream from bridge on Hwy 181. (131.8) 5/08/84 1213 22.2 232 (0.63) 28.5 50052900 Quebrada las Bambuas at mouth, PR Lat 18 13 31. long 66 00 58 Hydrologic unit 21010005. 2.33 3/26/84 1407 0.33 545 (0.01) 24.0 300 ft (91 m) upstream from bridge on Hwy 183 and 900 ft (275 m) above junction with (6.03) 5/08/84 1043 0.07 539 (0.002) 26.0 Rio Grande de Loiza. 50053050 Rio Turabo at 8orinquen, Lat 18 10 11, long 66 32 37 PR Hydrologic unit 21010005. At bridge on Hwy 765 and 7.79 3/26/84 1036 3.42 172 (0.24) 24.5 50053300 Quebrada Beatriz above 1.2 mi (1.9 km) north of Escuela Anon. Lat 18 11 15, long 66 33 04 (20.19) 5/07/84 1230 8.34 183 (0.24) 28.5 Rio Turabo, PR Hydrologic unit 21010005. 1,400 ft (425 m) downstream from bridge on Hwy 765 and 400 ft (120 m) above junction with Rio Turabo. 5.65 (14.63) 3/26/84 1140 5/07/84 1412 2.56 258 (0.07) 2.81 268 (0.08) 27.0 29.5 50053500 Rio Turabo below Lat 18 11 22, long 66 03 02 Quebrada Beatriz, PR Hydrologic unit 21010005. 0.9 mi (1.4 km) downstream 17.3 from bridge on Hwy 765 and (44.8) 400 ft (120 m) below junction with Quebrada Beatriz. 3/26/84 1220 12.7 206 (0.36) 5/07/84 1506 9.00 220 (0.25) 28.0 30.5 270 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 50054500 Rio Turabo at Caguas, PR Lat 18 13 36, long 66 01 40 3/26/84 1334 6.83 256 29.0 Hydrologic unit 21010005. 29.3 (0.19) At bridge on Hwy 183, 0.9 mi (75.9) (1.5 km) southeast of the 5/08/84 0940 3.89 359 26.5 plaza in Caguas, and 1.3 mi (0.11) (2.1 km) upstream from Rio Grande de Loiza. 50055310 Rio Caguitas above mouth, Lat 18 15 22, long 66 01 06 3/29/84 1157 15.3 696 28.5 PR Hydrologic unit 21010005. 13.0 (0.43) 0.5 mi (3.7 km) downstream (46.6) from bridge on Hwy 30 and 5/10/84 1430 16.4 480 31.0 0.4 mi (0.7 km) above junc- (0.461 tion with Rio Grande de Loiza. 50055410 Rio Sairoa at mouth, PR Lat 18 15 47, long 66 31 09 3/29/84 13031.36 489 29.0 Hydrologic unit 21010005. 7.51 (0.05) 0.8 mi (1.2 km) downstream (19.45) from bridge on Hwy 30 and 5/10/84 1521 2.63 440 31.0 0.4 mi (0.6 km) above junc- (0.07) tion with Rio Grande de Loiza. 50055500 Quebrada Honda at Las Lat 18 13 15, long 65 49 57 Torras, PR Hydrologic unit 21010005.At 3/30/84 1130 0.11 408 26.5 bridge on Hwy 31, 100 ft 1.15 (0.003) (30 m) east of Hwy 31 and (2.98) Hwy 936 intersection, and 5/07/84 1310 DRY 1.8 mi (2.9 km) abova junc- tion with Rio Gurabo. 50055600 Rio Gurabo at Ceiba Let 18 13 29, long 65 51 34 Norte, PR Hydrologic unit 21010005. 3/30/84 1225 3.25 322 32.0 0.4 mi (0.6 km) downstream 12.0 (0.09) from bridge on Hwy 31 and (31.1) 0.2 ci (0.4 km) below junc- 5/07/84 1235 1.08 400 28.0 tion with Quebrada Honda. (0.03) 50055700 Rio Gurabo at El Mango, Let 18 13 56, long 65 52 52 3/28/84 1110 3.23 376 24.0 PR Hydrologic unit 21010035. 16.5 (0.09) 1.2 mi (2.0 km) upstream (42.7) from bridge on Hwy 31 and 5/09/84 1456 1.25 387 32.0 0.2 mi (0.4 km) above junc- (0.04) tion with Quebrada Grande. 50056000 Rio Valenciano near Las Lat 18 10 37, long 65 54 21 3/28/84 1004 6.22 203 24.0 Piedras, PR Hydrologic unit 21010005. 6.35 (0.18) At bridge on Hwy 133 (km (17.74) 17.3), and 3.2 mi (5.1 km) 5/09/84 1326 4.17 221 32.5 west of Las Piedras. (0.12) 50056550 Rio Valenciano at mouth, Lat 18 14 13, long 65 55 13 3/28/84 1240 10.9 354 28.0 PR Hydrologic unit 21010035. 19.0 (0.31) 0.6 ci (1.0 km) downstream (49.2) from bridge on Hwy 31 and 5/09/84 1629 7.61 413 32.0 1,000 ft (305 m) above junc- (0.22) tion with Rio Gurabo. 50056600 Rio Gurabo near Juncos, Lat 18 14 38, long 65 55 25 PR Hydrologic unit 21010005. 3/28/84 1338 13.7 348 29.5 At bridge on Hwy 185 and 50.0 (0.39) 0.4 mi (0.6 km) below junc- (129.5) tion with Rio Valenciano. 5/08/84 1521 7.79 357 32.5 (0.22) 50057015 Rio Gurabo below Hwy 943, Lat 18 15 50, long 65 58 41 PR Hydrologic unit 21010005. 3/29/84 1412 15.8 382 29.0 0.6 mi (0.9 km) northeast of 62.4 (0.45) Plaza de Gurabo and 0.7 mi (161.6) (1.2 km) downstream from 5/10/84 1220 12.0 432 29.0 bridge on Hwy 181. (0.34) I 271 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations-Continued STATION NUMBER STATION NAME LOCATION AND BASIN DRAINAGE AREA sq mi (sq km) DATE TIME STREAM- SPE- FLOW CIFIC C0NDUC- cfs TANCE (cms) umhos TEMPEk ATURE deg C Rio Grande de Loiza basin 50058400 Rio Canas above Lago Loiza. PR Lat 18 17 34. long 66 32 33 Hydrologic unit 21010005. At bridge about 2000 ft (610 m) off Hwy 1. 1.0 mi (1.6km) upstream from Lago Loiza. 1.0 mi (1.6 km) north of La Barra, and 4.0 mi (6.4 km) north of Caguas. 7.63 (19.76) 3/29/84 1021 5/10/84 1054 2.20 (0.06) 1.49 (0.04) 338 362 26.0 28.0 50059000 Lago Loiza at Dam Site, PR Let 18 19 49, long 66 01 00 Hydrologic unit 21010005. At pumphouse at damsite and 1.9 mi (3.1 km) south of Trujillo Alto Plaza. 203 (539) 3/29/84 0926 5/10/84 0955 2.00 210 26.0 (0.06) 1.37 338 28.0 (0.04) 50059200 Quebrada Grande at La Gloria, PR Lat 18 20 28, long 65 59 20 Hydrologic unit 21010005, 400 ft (122 m) downstream from bridge on Hwy 131, 200 ft (61 m) below junction with Quebrada Grande, and 1.5 mi (2.4 km) above junc­ tion with Rio Grande de Loi- 12.0 (31.1) 3/26/84 1445 5/09/84 1021 2.25 559 (0.06) 0.64 630 (0.02) 30.0 25.0 za. 50060000 Rio Grand. de Loiza above Carolina. PR Lat 18 22 10, long 65 57 50 Hydrologic unit 21010005. 0.5 mi (0.3 km) west of Tru- 230 jillo Bajo and 0.2 mi (0.3 (596) km) northwest of intersection of Hays 853 and 858. 3/26/84 1335 5/09/84 NO FLOW 367 DEEP POOL NO MEAS 30.5 50060200 Quebrada Maracuta at Trujillo 8ajo. PR Lai 18 22 11. long 65 57 28 Hydrologic unit 21010005. At bridge on Hwy 853 and 0.3 mi (0.5 km) above junc­ tion with Rio Grande da Loi­ za. 10.2 (26.4) 3/26/84 1255 5/09/84 1305 1.30 569 32.0 (0.04) 0.58 680 30.0 (0.02) 50061000 Rio Grande de Loiza at Carolina. PR Lat 18 22 39, long 65 57 08 Hydrologic unit 21010005. 243 At bridge on Hwy 3, 0.5 (629) mi (3.8 km) southeast of Ca­ rolina Plaza. and 9.1 mi (14.6 km) upstream from mouth. 3/26/84 1130 5/07/84 1322 43.3 (1.23) 11.7 (0.33) 365 437 30.0 29.0 50061200 Rio Canovanillas at Carruzos. PR Lat 18 19 03, long 65 54 16 Hydrologic unit 21010005. At bridge on road 500 ft (152 m) off Hwy 185, and 0.7 mi (1.1 km) east of Jesus T. Pinero School. 9.10 (23.57) 3/28/84 1145 5/09/84 1436 2.52 564 27.5 (0.07) 1.45 652 28.5 (0.04) 50061500 Rio Canovanillas at Loiza. PR Lat 18 22 44. long 65 55 00 Hydrologic unit 21010005.At bridge on Hwy 3. 0.9 mi (1.4 km) upstream from Rio Gran- do Loiza, and 1.0 mi (1.6 km) west of Loiza. 16.5 (42.7) 3/28/84 0920 5/07/84 1440 4.50 583 26.0 (0.13) 2.99 592 30.5 (0.08) 50061900 Rio Canovanas at La Marina, PR Lat 18 21 01. long 65 53 51 Hydrologic unit 21010005. 100 ft (30 m) east of Hwy 185 and 0.9 mi (1.5 km) downstream from bridge on H y 957. 14.6 (37.8) 3/28/84 1255 5/09/ 84 1548 8.58 293 28.0 (0.24) 4.67 387 27.5 (0.13) 50062000 Rio Canovanas at Loiza. PR Lat 18 22 53. long 65 53 33 Hydrologic unit 21010005.At bridge on Hwy 958 and 0.3 mi (0.5 km) east of Loiza. 17.0 (44.0) 3/28/84 1010 5/07/84 1518 0.50 317 25.5 (0.01) 0.32 378 23.5 (0.01) 272 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM- SPE- TEMPER- NUMBER NAME AND AREA sq mi DATE TIME FLOW cfs CIFIC CONDUC- TANCE ATURE BASIN (sq km) (cms) umhos deg C Rio Herrera basin 50062500 Rio Herrera near Colonia Let 18 21 02, long 65 52 00 Dolores, PR Hydrologc unit 21010)05. On right bank, at bridge on on Hwy 958, 2.0 mi (3.2 km) south of Goiania Dolores, and 3.2 mi (5.1 km) south­ west of Rio Grande. 2.75 (7.12) 3/29/84 1025 5/08/84 1543 3.58 232 (0.10) 1.09 300 (0.03) 25.0 27.5 50062800 Rio Herrera near Loiza, PR Lat 18 22 48, long 65 51 33 Hydrologic unit 21010005-At bridge on Hwy 3, 1.9 mi (3.1 km) west of Rio Gran­ de, and 2.8 mi (4.5 km) east of Loiza. 3.86 (10.00) 3/29/84 0930 5/07/84 1614 2.94 257 (0.08) 2.83 317 (0.08) 25.5 29.0 50063000 Quebrada Cambalacha near Loiza, PR Lat 18 22 49, long 65 52 04 Hydrologic unit 21019005.At bridge on Hwy 3, 2.2 mi (3.5 km) east of Loiza, and 2.5 mi (4.3 km) west of Rio Grande. 1.32 (3.42) 3/29 / 8 4 0840 5/07/84 1654 0.27 602 (0.01) 0.32 730 (0.01) 25.5 27.5 Rio Espiritu Santo basin 50063540 Rio Espiritu Santo at Camp Eliza Colberg, PR Lat 18 20 22, long 65 49 42 Hydrologic unit 21010035. 3.1 mi (4.9 km) northeast of Pico El Yunque and 0.3 mi (1.3 km) below junction with Quebrada Sonadora. 5.27 (13.65) 3/27 / 8 4 1010 5/08/84 1407 6.36 (0.19) 4.61 (0.13) 79 94 23.0 27.5 50063850 Quebrada Jimenez near Rio Grande, PR Let 18 21 36, long 65 48 47 Hydrologic unit 21010005. 300 ft (91 m) upstream from Rio Espiritu Santo and 1.9 mi (3.1 km) southeast of Rio Grande. 3.63 (9.40) 3/27/84 1125 5/08/84 1305 3.31 150 (0.09) 3.75 107 (0.11) 25.0 26.5 50064200 Rio Grande near El Verde, Lat 18 20 43, long 65 50 30 PR Hydrologic unit 21010015.On left bank, 400 ft (120 m) upstream from bridge on Hwy 960, 500 ft (150 m) south­ west of junction of Hays 956 & 960, 1.1 mi (1.8 km) west of El Verde, and 2.7mi (4.3km) south of Rio Grande. 7.31 (18.93) 3/29/84 1345 5/08/84 1504 6.16 155 (0,17) 4.25 202 (0.12) 29.5 31.5 50064500 Rio Grande at Rio Grande, Let 18 22 40, long 65 49 28 PR Hydrologic unit 21010005.At bridge on Hwy 3, 0.5 mi (0.8 10.4 km) southeast of Rio Grande, (26.9) and 0.8 mi (1.3km) upstream from Rio Espiritu Santo. 3/29 / 8 4 1115 5/08 / 8 4 0916 1.96 (0.06) 4.92 (0.14) 207 248 27.0 27.0 50064900 Quebrada Juan Gonzalez near Rio Grande, PR Lat 18 22 37, long 65 48 04 Hydrologic unit 21010005.At bridge on Hwy 955, 800 ft (244 m) upstream from bridge on Hwy 3, and 1.5 mi (2.4 km) above junction with Rio Es­ pirutu Santo. 2.17 (5.62) 3/27/84 1355 5/08/84 1017 1.43 287 (0.04) 0.72 367 (0.02) 25.0 25.0 273 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 Mameyes basin 50066000 Rio Mameyes at Mamoyes. La! 18 22 30, long 65 45 50 PR Hydrologic unit 21010005. At bridge on Hwy 3, 0.5 mi (0.8 km) downstream from Quebrada Anon. 0.5 mi (0.9 km) east of Mameyes (Palmer Post Office), and 3.1 Ai (5.0 km) east of Luquillo. 3/27/84 1525 16.7 159 28.0 13.5 (0.47) (35.0) 5/08/84 1124 12.3 143 26.0 (0.35) Quebrada Mate de Platano basin 50066500 Quebrada Mata do Platen() Let 18 22 52, long 65 43 16 near Luquillo. PR Hydrologic unit 21010005. At bridge on Hwy 3, 0.4 mi (0.6 km) northwest of Lu- quillo Plaza, and 0.3 mi (0.5 km) above mouth. Rio Sabana basin 50068000 Rio Sabana at Luquillo, Let 18 22 15, long 65 42 51 PR Hydrologic unit 21010005.At Hwy 3 bridge and 0.4 mi (0.6 km) southwest of Luquillo. 2.38 3/26/84 1110 NO FLOW 12400 26.5 (6.16) 5/07/84 1134 NO FLOW 17400 28.0 7.05 (18.26) 3/26/84 1208 4.17 171 26.0 (0.12) 5/07/84 1239 3.28 168 27.0 (0.09) 50069000 Rio Pitahaya near Luquillo, PR Rio Pitahaya basin Let 18 21 32, long 65 42 03 Hydrologic unit 21010005.At bridge on Hwy 3. 1.6 mi (2.6 km) southeast of Luquillo, and 1.7 mi (2.7 km) upstream from Rio Sabana. Rio Juan Martin basin 4.51 (11.68) 3/26/84 1248 NO FLOW 171 26.5 5/07/84 1351 3.25 178 27.0 (0.09) 50069300 Tributary to Rio Juan Lat 18 21 14, long 65 40 59 Martin at Hwy 3, PR Hydrologic unit 21010005.At bridge on Hwy 3 and 200 ft (61 m) above junction with Rio Juan Martin. 50069350 Rio Juan Martin above Lett 18 21 44, long 65 40 35 mouth, PR Hydrologic unit 21010005. 0.8 mi (1.2 km) downstream from bridge on Hwy 3 and 0.4 mi (0.7 km) above south. Quebrada Fajardo basin 50069400 Quebrada Fajardo at Hwy Lat 18 20 49, long 65 39 55 194, PR Hydrologic unit 21010005. At bridge on Hwy 194, 0.5 mi (0.8 km) east of Hwy 194 and Hwy 3 intersection, and 1.5 mi (2.4 km) above mouth. Rio Fajardo basin 3/26/84 1321 0.04 611 27.5 0.53 (0.001) (1.37) 5/07/84 1410 0.01 578 30.0 (0.000) 3/26/84 1446 0.28 425 29.0 2.41 (0.01) (6.24) 5/08/84 0945 0.15 435 27.5 (0.004) 3/26/84 1346 0.06 465 35.0 1.16 (0.002) (3.00) 5/07/84 1428 0.01 520 33.0 (0.000) 50071200 Rio Fajardo at Vapor below Confluence, PR Let 18 18 28. long 65 40 10 Hydrologic unit 21010035. 19.4 1.7 mi (2.8 km) southwest of (50.2) Plaza do Fajardo and 1.4 mi (2.3 km) upstream from bridge on Hwy 3. 3/27/84 1059 6.87 125 29.0 (0.19) 5/07/84 1556 2.31 127 25.0 (0.07) 274 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 Fajardo basin 50072000 Rio Fajardo at Fajardo, Let 18 19 11, long 65 39 07 3/27/84 0959 8.72 150 26.5 PR Hydrologic unit 21010005. (0.25) At bridge on Hwy 3, 0.5 mi 21.6 (0.8 km) south of Fajardo, (55.9) and 2.5 mi (4.9 km) upstream 5/07 / 8 4 1650 3.18 175 25.0 from mouth. (0.09) 50072600 Quebrada Mata Redonda Lat 18 19 34, long 65 39 00 near Fajardo, PR Hydrologic unit 21010035-At 3/27/84 1205 0.85 125 29.5 bridge on Hwy 3, 1.2 mi (2.0 (0.02) km) south of Plaza de Fa- 1.34 jardo, and 1.7 mi (2.7 km) (3.47) 5/07/84 DRY above junction with Rio Fa­ jardo. Rio Oemajagua basin 50072700 Rio Oemajagua at Lat 18 17 10, long 65 38 21 Oemajagua, PR Hydrologic unit 21010005. 3/27/84 1326 0.16 324 28.0 At bridge on Hwy 3, 203 ft 1.61 (0.005) (61 m) south of Hwy 3 and (4.17) Hwy 982 intersection, and 5/08/84 1106 0.01 415 28.0 0.3 mi (0.5 km) above mouth. (0.000) Quebrada Ceiba basin 50072800 Quebrada Ceiba at Ceiba, Lat 1E 16 25, long 65 38 25 PR Hydrologic unit 21010035.At 3/28/84 0826 1.18 415 26.5 bridge on Hwy 3, 0.8 mi (1.3 2.15 (0.03) km) northeast of Plaza de (5.57) Ceiba, and 0.8 mi (1.3 km) 5/08/84 1229 1.00 480 30.0 above mouth. (0.03) Quebrada Aguas Claras basin 50072900 Quebrada Aguas Claras Lat 18 16 03, long 65 38 20 near Ceiba, PR Hydrologic unit 21010005.At 3/27/84 1349 0.25 376 31.0 bridge on Hwy 979 and 0.6 mi 0.83 (0.01) (0.9 km) above mouth. (2.15) 5/08/84 1136 0.24 285 32.0 (0.01) Rio Daguao basin 50073200 Rio Daguao at Daguao, PR Lat 18 13 42, long 65 40 39 3/28/84 0903 0.40 508 25.0 At railroad bridge, 0.1 mi (0.01) (0.2 km) downstream from 2.26 bridge on Hwy 3. 0.3 mi (0.5 (5.85) 5/08/84 1325 0.25 505 28.0 km) east of Daguao, and 2.8 (0.01) mi (4.5 km) upstream from mouth. 50073300 Rio Oaguao above mouth. Lat 18 13 36, long 65 39 31 PR Hydrologic unit 21010005. At bridge 650 ft (200 m) 3/27/84 1411 NO FLOW 1130 30.0 downstream from bridge on 4.29 Langley Drive and 0.9 vi (11.11) 5/08/84 1148 NO FLOW 1320 28.5 (1.4 km) above mouth. Quebrada Palma basin 50073400 Quebrada Palma at Daguao, Lat 18 13 16, long 65 41 30 3/28/84 0937 0.99 329 25.0 PR Hydrologic unit 21010005. (0.03) At bridge on Hwy 3. 0.8 mi 4.84 (1.3 km) southwest of 0a- (12.54) guao, and 1.7 mi (2.7 km) 5/08/84 1350 0.36 345 26.5 upstream from mouth. (0.01) 275 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION NUMBER STATION NAME LOCATION AND DRAINAGE AREA so mi BASIN (31:4 km) Quebrada 3otija basin 50073500 Quebrada Botija at 31, PR Hwy, Let 18 12 55, long 65 42 25 Hydrologic unit 21010035. At bridge on Hwy 31, 5)0 ft (152 m) upstream from bridge on Hwy 3, and 1.6 mi (2.6 km) above mouth. 1.10 (2.85) Rio Santiago basin 50074000 Rio Santiago at Naguabo, Let 18 12 57, long 65 43 41 PR Hydrologic unit 21010005.At bridge on Hwy 31, 0.3 mi 4.99 (0.5 km) northeast of Nagua- (12.92) bo, 0.4 mi (0.5 km) downstream from Quebrada Grande, and 2.2 mi (3.5 km) upstream from mouth. 50074010 Tributary to Rio Let 18 12 04, long 65 43 33 Santiago at Hwy 192, PR Hydrologic unit 21010035. At bridge on Hwy 192 and 1.03 0.7 mi (1.1 km) above junc- (2.80) tion with Rio Santiago. Rio Blanco basin 50077000 Rio Blanco at Rio Blanco, Lat 18 13 09, long 65 46 57 PR Hydrologic unit 21010005. At bridge on Hwy 31 and 0.4 mi 17.6 (0.6 km) east of Rio Slane°. (45.6) 50077500 Rio Blanco below La Fe, Lat 18 12 17, long 65 45 31 PR Hydrologic unit 21010005. 20.3 1.9 mi (3.0 km) downstream (53.9) from bridge on Hwy 31 and 0.7 mi (1.1 km) south of Huy 31 and Hwy 970 intersec- tion. 50077600 Quebrada Vaca below La Lat 18 12 25, long 65 45 04 Fe, PR Hydrologic unit 21010005. 1.1 mi (1.8 km) downstream 3.47 from bridge on Hwy 31 and (8.99) 0.3 mi (1.4 km) southeast of Hwy 31 and Hwy 970 intersec­ tion. 50077700 Rio Blanco at mouth, PR Lat 18 11 17, long 65 41 47 Hydrollcrc unit 21010005.At bridge on Hwy 3, at mouth, 27.2 and 0.8 mi (1.2 km) south- (70.4) west of Hwy 3 and Hwy 192 intersection. Rio Anton Ruiz basin 50078510 Rio Anton Ruiz at Pasto Lat 18 10 26, long 65 47 05 Viejo, PR Hydrologic unit 21010005.At 5.75 bridge on unimproved road, (14.89) 300 ft (91 m) north of Hwy 925, and 1.5 mi (2.4 km) north of Hwy 3 and Hwy 925 intersection. STREAM- SPE- TEMPER- FLOW CIFIC DATE TIME CONOUC- ATURE cfs TANCE (cms) umhos deg C 3/28/84 1000 0.14 359 25.5 (0.004) 5/08/84 1427 0.02 457 27.0 (0.001) 3/23/84 1102 1.33 204 30.5 (0.04) 5/08/84 1523 0.45 226 33.5 (0.01) 3/28/84 1149 NO FLOW 526 25.5 5/08/84 1535 NO FLOW 348 29.5 3/29/84 1345 3.88 173 28.0 (0.11) 5/07/84 1410 9.47 165 30.0 (0.27) 3/29/84 1255 4.69 219 29.0 (0.13) 5/08/84 1119 2.01 340 29.0 (0.06) 3/30/84 1015 NO FLOW 354 27.5 5/08/84 1020 NO FLOW 403 28.0 3/28/84 1155 2.67 5830 30.0 (0.08) 5/08/14 1540 NO FLOW 38400 31.0 3/29/84 1150 0.96 340 30.5 (0.03) 5/08/84 1258 0.11 430 32.0 (0.003) 276 DISCHARGE AT PARTIAL -RECORD STATIONS Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM- SPE- TEMPER­ NUM3ER NAME AND AREA sq mi DATE TIME FLOW cfs CIFIC CONDUC- TANCE ATURE BASIN (sq km) (cms) umhos deg C Rio Anton Ruiz basin 50078700 Rio Anton Ruiz at mouth, Lat 18 10 35, long 65 44 23 PR Hydrologic unit 21010005. At bridge on Hwy 3, 1.8 mi (2.9 krs) southwest of Hwy 3 and Hwy 192 intersection, and 200 ft (61 m) above mouth. a 7.99 (20.69) 3/28/84 1241 PONDED 13800 5/08/84 1543 PONDED 28200 29.0 29.0 Rio Humacao basin 50031000 Rio Humacao at Las Piedras, PR Lat 18 10 27, long 65 52 11 Hydrologic unit 21010005. On left bank about 60ft (18.3 m) off bridge on Hwy 921 (km 1.1), 0.6mi (1.0km) south -east of junction with Hwy 30, 0.8 mi (1.3 km) down­ stream from Ouebrada Blanca. and 0.3mi (1.3km) south of Las Piedras. 6.65 (17.22) 3/28/84 1400 5/08/84 1515 9.04 159 (0.26) 7.04 218 (0.20) 28.0 31.0 50081500 Rio Humacao near Humacao, Lat 18 0? 37, long 65 50 41 PR Hydrologic unit 21010005.At bridge on Hwy 914 and 1.3 mi (2.1 km) northwest of Humacao. 9.23 (23.91) 3/29/84 1450 5/09/84 1022 6.25 209 (0.18) 1.63 360 (0.05) 27.0 28.0 50031900 Ouebrada Mariana at Patagonia, PR Lat 18 03 46, long 65 49 40 Hydrologic unit 21010035-At bridge on Hwy 908 and 450 ft (137 m) above junction with Rio Humacao. 5.76 (14.92) 3/29/84 1105 5/08/84 1405 5.09 261 (0.14) 4.03 315 (0.11) 29.0 33.0 50032500 Rio Humacao Flood Channel near mouth. PR Lat 18 07 28, long 65 47 23 Hydrologic unit 21010005. 3.1 mi (4.9 km) southeast of Plaza de Humacao and 0.6 mi (0.9 km) above mouth. 25.1 (65.3) 3/28/84 1250 21.6 484 (0.61) 5/09/84 1227 16.1 540 (0.46) 33.0 30.0 Rio Candelero basin 50082600 Rio Candelero PR at Hwy 906, Lat 18 06 17, long 65 48 54 Hydrologic unit 21010005.At bridge on Hey 906. 1.4 mi (2.2 km) downstream from bridge on Hwy 3. and 1.7 mi (2.7 km) above mouth. 3.65 (9.45) 3/28/84 1140 5/09/84 1337 0.66 269 (0.02) 0.44 372 (0.01) 33.0 30.0 50082700 Rio Candelero at mouth. PR Lot 18 06 09, long 65 47 43 Hydrologic unit 21010005.At bridge on unimproved road, 1.3 mi (2.1 km) downstream from bridge on Hwy 906. and 0.4 mi (0.7 km) above mouth. 4.77 (12.35) 3/28/84 1100 5/09/84 1410 0.44 295 (0.01) DRY 34.0 Rio Guayanes basin 50082800 Rio Guayanes near Colonia Laura. PR Lat 18 04 55, long 65 57 32 Hydrologic unit 21010005.0n left bank, 1000 ft (305 m) 4.69 south of Hay 182. 4.5 xi (12.15) (7.2km) west of Colonia Laura. and 5.8 mi (9.3 km) north- northwest of Yabucoa. 3/29/84 0930 12.3 153 (0.35) 5/10/84 1336 9.05 152 (0.26) 24.0 27.5 277 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION STATION LOCATION NUMBER NAME AND BASIN Rio Guayanes basin 50032810 Rio Guayanas below Rio Arenas, PR Lat 18 04 44. long 65 56 54 Hydrologic unit 21010035. 100 ft (30 m) below junction with Rio Arenas and 2.3 mi (4.6 km) above junction with Quebrada Guayabo. 50083400 Rio Guayanes at Calahazas. PR Lat 18 03 33, long 65 54 03 Hydrologic unit 21010005.At bridge on Hwy 132 and 1.4 mi (2.2 km) above junction with Rio Limones. 50034000 Rio Limones near Yabucoa. Lat 18 04 35, long 65 53 42 PR Hydrologic unit 21010005-At bridge on Hwy 904. 1.2 mi (2.0 km) upstream from Rio Guayanas, and 2.0 mi (3.2 km) northwest of Yabucoa. 50085000 Rio Guayanes at Yabucoa. Lat 18 03 42, long 65 52 33 PR Hydrologic unit 21010005.At bridge on 4ry 3. 0.5 mi (0.8 km) downstream from Rio Li- mones, and 0.7 mi (1.1 km) north of Yabucoa. 50035100 Rio Guayanes at Central Let 18 03 57, long 65 52 22 Roig, PR Hydrologic unit 21010005. At abandonend lake control 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 mouth Lat 18 04 16. long 65 50 14 near Playa de Guayanes. Hydrologic unit 21010005. PR At dirt road crossing, south of Hwy 906. and 3.1 mi (5.0 km) northeast of Yabucoa. 50086000 Rio del Ingenio near Let 18 05 03. long 65 51 27 Yabucoa. PR Hydrologic unit 21010005.At bridge on Hwy 3. 0.2 mi (0.3 km) upstream from Quebrada Cortadera and Aguacate, and 2.6 mi (4.2 km) northeast of Yabucoa. 50086300 Rio del Ingenio near Lat 18 04 20. long 65 50 02 Playa de Guayanes• PR Hydrologic unit 21010005. 1.8 mi (2.9 km) downstream from bridge on Hwy 3 and 0.6 mi (1.0 km) above junc­ tion with Rio Guayanas. 50086500 Rio Guayanes at Playa de Lat 18 03 45, long 65 49 42 Guayanes, PR Hydrologic unit 21010005. At old railroad crossing. 0.2 mi (0.3 km) from mouth. 0.4 mi (0.6km) west of Pla­ ya de Guayanes. and 3.5 mi (5.6 km) northeast of Yabu­ coa. DRAINAGE AREA sq mi (sq km) 7.44 (19.27) 17.2 (44.5) 7.89 (12.70) 25.5 (63.6) 26.6 (68.9) 27.6 (71.5) 2.46 (6.37) 11.5 (29.8) 34.0 (88.1) STREAM- SPE- TEMPER- FLOW CIFIC DATE TIME CONOUC- ATURE cfs TANCE (cms) umhos deg C 3/29/84 NO MEAS 5/08/84 - NO MEAS 3/29/84 1052 22.2 169 25.5 (0.63) 5/08/84 1105 16.4 173 27.0 (0.46) 3/29/84 1312 12.4 169 29.0 (0.35) 5/08/84 0814 9.12 174 24.5 (0.26) 3/29/ 84 1212 35.6 175 26.5 (1.01) 5/10/84 1632 30.2 172 31.0 (0.86) 3/27/ 84 1010 31.1 169 23.5 (0.88) 5/10/84 1427 26.5 177 26.5 (0.75) 3/27/84 1245 28.5 151 29.0 (0.81) 5/10/84 1236 29.7 152 30.5 (0.84) 3/27/84 1140 2.64 190 28.5 (0.07) 5/09/34 1556 1.87 220 28.5 (0.05) 3/27/84 1315 5.18 248 32.0 (0.15) 5/10/84 1134 2.95 373 32.5 (0.08) 3/28/84 0915 40.6 182 26.5 (1.15) 5/10/84 1020 22.4 210 28.0 (0.63) 278 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION NUMBER STATION NAME LOCATION AND BASIN DRAINAGE AREA sq mi (sq km) DATE TIME STREAM- SPE- TEMPER- FLOM CIFIC CONDUC- ATURE cfs TANCE (cms) umnos deg C Cano Santiago basin 50087100 Cano Santiago at Hwy 3. PR Lat 18 03 25. long 55 52 33 Hydrologic unit 21010105.At 3.81 bridge on Hwy 3. 0.5 si (0.8 (9.87) km) north of Plaza de Yabucoa, and 0.3 mi (0.5 km) below junc- tion with Quebrada Aguas Largas. 3/29/14 1358 5/05/34 0937 1.79 (0.05) 0.90 (0.03) 289 287 27.0 26.0 50037200 Cano Santiago near Central Roig, PR Lat 13 03 18, long 65 50 59 Hydrologic unit 21010305. At service road and railroad bridge. 1.8 mi (2.9 km) east of Central Roig. and 2.0 mi (3.2 km) east of Yabucoa. 6.04 (1 5.64) 3/27/84 1055 5/10/84 1536 4.18 370 (0.12) 2.40 475 (0.07) 26.0 30.0 Rio Maunabo basin 50091000 Rio Maunabo at Maunabo. PR Let 18 00 24, long 65 54 19 Hydrologic unit 21010305. At bridge on Hwy 3, 0.4 mi (0.6 km) southwest of Mau­ nabo, and 1.3 mi (2.1 km) upstream from mouth. 12.4 (32.1) 3/2 8 / 84 0937 5/08/84 1426 9.61 244 (0.27) 6.05 243 (0.17) 25.5 34.0 Rio Jacaboa basin 50091500 Rio Jacaboa at Hacienda San Isidro, PR Let 17 58 48, long 65 53 03 Hydrologic unit 21010004. At bridge on Hwy 3, 0.4 mi (0.6km) upstream from mouth, 0.4 mi (0.6 km) east of Ha­ cienda San Isidro, and 4.3 mi (7.7 km) southwest of Maunabo. 5.23 (13.5) 3/28/84 1046 5/08/84 1555 0.68 301 (0.02) 0.08 356 (0.002) 28.0 33.0 Rio Chico basin 50091800 Rio Chico at Providencia, Lat 17 59 16, long 66 00 18 PR Hydrologic unit 21010004. At flat low bridge 20) ft (61 m) south of Hwy 3, 0.5 mi (0.8 km) above mouth, and 1.5 mi (2.4 km) south­ east of Patillas. 4.93 (12.77) 3/28/84 1117 5/03/84 1715 0.07 1110 (0.002) 0.43 995 (0.01) 34.0 30.5 Rio Grande de Patillas basin 50091950 Rio Grande de Patillas below Quebrada Sonadora, PR Lat 18 03 43. long 66 02 57 Hydrologic unit 21010004. 1.300 ft (395 m) downstream from bridge on Hwy 184 and 1,000 ft (305 m) below junc­ tion with Quebrada Sonadora. 8.75 (22.66) 3/23/84 1242 5/08/34 1132 8.62 136 (0.24) 9.14 156 (0.26) 24.5 25.0 50094200 Rio Grande de Patillas at Patillas, PR Lat 18 00 15, long 66 01 27 Hydrologic unit 21010104. At bridgo on Hwy 3. 0.7 mi (1.1 km) west of Patillas, and 1.9 mi (3.1km) upstream from mouth. 27.9 (72.3) 3/23/84 5/08/84 1840 DRY 1.45 243 (0.04) 28.0 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 mi (0.8 km) above mouth, (75.1) and 0.6 mi (1.0 km) west of Providencia. 3/27/84 1312 5/09 / 9 4 1325 1.56 338 (0.04) 1.01 412 (0.03) 30.0 33.0 279 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION NUMBER STATION NAME LOCATION AND BASIN DRAINAGE AREA sq mi (sq km) DATE TIME STREAM- SPE- FLOW CIFIC CONDUC- cfs TANCE (cms) umhos TEMPER- ATURE deg C Rio Nigua basin 50094500 Rio Nigua at Arroyo. PR Lat 17 53 10. long 66 03 41 Hydrologic unit 21010034. At bridge on Hwy 178, 0.2 mi (0.3 km)north of Arroyo. and 3.7 mi (6.0 km) east of Guayama. 3.04 (20.82) 3/27/84 1105 5/09/84 1410 0.12 1230 (0.003) 0.03 750 (0.301) 35.0 37.0 Quebrada Salads basin 50094510 Quebrada Salada near Arroyo, PR Lat 18 53 50. long 66 04 23 Hydrologic unit 21010034. At bridge on Hwy 3 and 0.9 mi (1.4 km) upstream from mouth. 0.76 (1.97) 3/27/84 1025 5/09/84 1448 0.04 2230 (0.001) 0.06 1460 (0.002) 27.5 33.0 Quebrada Corazon basin 50094520 Quebrada Corazon near Arroyo, PR Lat. 18 58 53. long 66 04 41 Hydrologic unit 21010004.At bridge on Hwy 3 and 1.0 mi (1.6 km) above mouth. 4.29 (11.11) 3/27 / 8 4 0955 5/09/84 1530 0.66 738 (0.02) 1.12 440 (0.03) 25.5 27.5 Rio Guamani basin 50095500 Rio Guamani near Guayama, Lat 17 57 30. long 66 08 20 PR Hydrologic unit 21010004. At railroad bridge, 0.5 mi (0.8 km) downstream from Hwy 3. 1.2 mi (1.9 km) up- stream from mouth. and 2.5 mi (4.0 km) southwest of Guayama. 12.3 (31.9) 3/30/84 DRY Rio Melania basin 50095900 Rio Melania near Jobos. PR Lat 17 57 51. long 66 59 30 Hydrologic unit 21010004. 0.6 mi (1.0 km) upstream from bridge on Hwy 3. 3.51 (9.09) 3/30/84 1445 0.55 (0.02) 592 23.0 Rio Seco basin 50097800 Rio Seco near Central Guamani, PR Lat 17 58 06. long 66 10 52 Hydrologic unit 21010004.At bridge on Hwy 3. 0.2 mi (0.3 km) north of Central Guamani. and 1.2 mi (1.9 km) northwest of Jobos. 11.1 (28.7) 3/30/84 DRY Rio Salinas (Nigua) basin 50100700 Rio Majada at Rabo del Buoy, PR Lat 18 02 17. long 66 14 27 Hydrologic unit 21010004.At 22.2 bridge on Hwy 1. at Rabo del (57.5) Buoy. 200 ft (61 m) upstream from Rio Lapa. and 5.6 mi (9.0 km) northeast of Sali- nas. 3/30/84 NO FLOW 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 (0.6 km) west of Salinas Plaza. 52.4 (135.7) 3/29/84 DRY 280 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION NUMBER STATION NAME LOCATION AND BASIN DRAINAGE AREA sq mi (sq km) DATE TIME STREAM- SPE- TEMPER- FLOW CIFIC CONDUC- ATURE cfs TANCE (cms) umhos deg C Rio Jueyas basin 50103000 Rio Jueyes near Jauca, PR Lat 17 53 45, long b6 20 20 Hydrologic unit 21010004.At bridge on Hwy 1, 1.8 mi (2.9 km) east of Jauca, and 2.7 mi (4.3 km) west of Salinas Plaza. 3.56 (22.17) 3/29 / 8 4 DRY Rio Coamo basin 50107000 Rio Coamo near Santa Isabel, PR Let 17 53 36, long 66 25 10 Hydrologic unit 21010004.At bridge on Hwy 1, at Yelaz- quez, and 1.1 mi (1.8 km) northwest of Santa Isabel Plaza. 69.0 (178.7) 3/29184 DRY Rio Descalabrado basin 50108500 Rio Descalabrado near Santa Isabel, PR Lat 17 59 34, long 66 26 35 Hydrologic unit 21010034.At bridge on Hwy 1, 0.9 mi (1.4 13.1 km) upstream from mouth, and (46.9) 3.1 mi (5.3 km) northwest of Santa Isabel. 3/29/84 DRY Rio Canas basin 50109500 Rio Canas near Santa Isabel, PR Lat 17 59 39, long 66 28 35 Hydrologic unit 21010004.At bridge on Hwy 1, 0.5 mi (0.8 km) from mouth, 0.6 ci (1.0 km) east of Pastillo, and 5.1 mi (3.2 km) northwest of Santa Isabel Plaza. 6.38 (16.52) 3/29/84 DRY 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 4.0 mi (6.4 km) south of (153.6) Juana Diaz. 3/29/84 DRY Rio Inabon basin 50113450 Rio Inabon near Arus, PR Lat 18 00 22, long 66 33 13 Hydrologic unit 21010004. At bridge on Hwy 1. 0.9 mi (1.4 km) east of Ponce Mu- nicipal Airport terminal, and 1.7 ci (2.7 km) west of Arus. 30.2 (78.2) 3/29/84 NO FLOW Rio Bucana basin 50114600 Rio Bucana at Ponce, PR Let 18 00 28, long 66 35 36 Hydrologic unit 21010004. At bridge on Hay 1, 0.2mi (0.3 27.3 km) east of intersection of (70.7) Hays 1 and 2, 1.5mi (2.4km) oast of Plaza Degetau in Ponce. and 3.1mi (5.0km) upstream from mouth. 3/29/84 1715 0.73 (0.02) 517 29.0 281 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION NUMBER STATION NAME LOCATION AND BASIN DRAINAGE AREA sq mi (sq km) DATE TIME STREAM- FLOW cfs (cms) SPE- TEMPER- CIFIC CONDUC- ATURE TANCE umhos deg C Rio Portugues basin 50116500 Rio Portugues at Hwy 2 by pass at Ponce. PR Lat 17 59 52. long 66 36 52 Hydrologic unit 21010004. On pier at bridge on Hwy 2 by pass. 1.1 mi (1.8 km) south of Plaza Oegetau. and 2.0 mi (3.2 km) upstream from mouth. 20.5 (53.1) 3/29/84 1410 1.29 592 (0.04) 34.0 Rio Matilde basin 50116970 Rio Canas below Las Americas Avenue, PR Let 13 00 37. long 66 38 23 Hydrologic unit 21010004. 0.5 mi (0.8 km) upstream from junction with Rio Pas- tillo. 3.39 (21.73) 3/29/84 1615 5.46 (0.15) 780 31.0 50119200 Quebrada dal Agua at Playa de Ponce, PR Lat 17 59 13, long 66 33 22 Hydrologic unit 21010004. 700 ft (213 m) upstream from junction with Rio Matilda. 6.45 (16.71) 3/29 / 8 4 DRY Rio Tallaboa basin 50122000 Rio Tallaboa at Tallaboa, Lat 13 00 31, long 66 43 49 PR Hydrologic unit 21010004.At bridge at Hacienda Dolores. 700 ft (213 m) upstream from Hwy 2. 0.8 mi (1.3 km) north- west of Tallaboa, and 7.6 mi (12.2 km) west of Plaza 0e- getau in Ponce. 31.50 (81.6) 3/29/84 1140 3.48 (0.10) 318 29.5 Rio Macana basin 50122900 Rio Macana at Magas Arriba, PR Lat 18 01 00. long 66 45 57 Hydrologic unit 21010004. 1.8 mi (2.8 km) east of Pla­ za de Guayanilla, 200 ft (60 m) upstream from bridge on Hwy 2. and 0.6 mi (1.0 km) upstream from mouth. 8.96 (23.21) 3/29 / 8 4 DRY Rio Yauco basin 50126500 Rio Yauco at Pueblo Sur at Yauco, PR Let 18 02 08, long 66 50 51 Hydrologic unit 21010004.At bridge on 4wy 2, 0.1 mi (0.2 km) east of Yauco. and 0.6 mi (1.0 km) upstream from Quebrada 3errenchin. 33.0 (85.5) 3/28/84 DRY Rio Loco basin 50129200 Quebrada Susua at Palomas, PR Lat 18 01 19, long 66 52 28 Hydrologic unit 21010004.At bridge on Hwy 2. 0.5 mi (0.8 km) north of Palomas, and 1.9 mi (3.1 km) southwest of Yauco. 3.23 (8.37) 3/28/84 DRY 50129500 Rio Loco near Guanica, PR Last 17 59 38, long 66 54 59 Hydrologic unit 21010004. 90 ft (27 m) upstream from sheet piling drop structu- re, 900 ft (274 m) upstream from Lajas Drainage Canal. 7.2 mi (11.6 km) downstream from Lago Loco. and 1.5 mi (2.4 km) north of Guanica. 21.0 (54.4) 3/28/84 1540 1.68 (0.05) 412 30.0 282 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 GATE TIME CONDUC- ATURE cfs TANCE BASIN Csq km) (cms) umhos dog C Quebrada Boqueron basin Lat 18 01 40, long 67 09 35 Hydrologic unit 21013094.At bridge on Hwy 101 and 0.9 mi (1.4 km) above mouth. 50130000 CIuebrada Boqueron at Boqueron, PR Rio Guanajibo basin 50132010 Rio Guanajibo below San Lot 18 05 28. long 67 02 33 German, PR Hydrologic unit 21010003. 0.5 mi (0.3 km) north of Plaza de San German and 1,500 ft (457 m) downstream from bridge on Hwy 360. Rio Yaguaz basin 4.35 3/28/84 1325 6.81 291 26.5 (11.27) (0.19) 36.1 3/28/84 1110 3.95 517 28.0 (93.5) (0.11) 50138900 Rio Yaguez at Balboa, PR Lat 18 12 13, long 67 07 55 Hydrologic unit 21010003. 1,200 ft (366 m) upstream 12.2 3/27/84 1740 6.53 320 26.0 from bridge on Balboa St. (31.6) (0.18) and 1.6 mi (2.5 km) up- stream from mouth. Rio Grande de Anasco basin 50146070 Rio Grande de Anasco at Lat 18 16 21. long 66 08 33 Anasco Arriba, PR Hydrologic unit 21010003. 0.8 mi (1.2 km) south of Anasco and 3.0 mi (4.8 km) upstream from mouth. Rio Grande basin 176 3/27/84 NO MEAS (456) 50146200 Rio Grande near Rincon. Lat 13 22 06, long 67 13 56 PR Hydrologic unit 21010003. At bridge on Hwy 115, 1.2 mi 2.83 3/27/84 1320 0.41 649 25.0 (1.9 km) upstream from mouth, (7.33) (0.01) and 2.2 mi (3.5 km) northeast of Rincon. Rio Ingenio basin 50146400 Rio Ingenio near Aguada. Lat 18 22 50. long 67 12 34 PR Hydrologic unit 21010003. At 6.22 3/27/84 1155 3.57 470 25.0 bridge on unimproved road, (16.11) (0.10) 0.3 xi (0.5 km) upstream from confluence with Rio Culebra, 0.7 ci (1.1 km) upstream from mouth of Rio Guayabo. and 1.4 ci (2.3 km) west of Aguada. Rio Culebra basin 50146600 Rio Culebra near Aguada. Lat 18 22 26. long 67 11 35 PR Hydrologic unit 21010003. At bridge on Hwy 411. 0.6 mi 3.70 3/27/84 1020 1.67 388 24.5 (1.0 km) south of Aguada, 1.5 (9.58) (0.05) mi (2.4 km) upstream from confluence with Rio Ingenio, and 1.9 mi (3.1 km) upstream from mouth of Rio Guayabo. Rio Culebrinas basin 50149100 Rio Culebrinas near Aguada. PR Lot 18 24 03. long 67 09 40 Hydrologic unit 21010003. At bridge on Hwy 2 and 2.3 97.0 3/27/84 NO MEAS mi (3.7 km) northeast of (251.2) Aguada Plaza. a Drainage area does not include coastal undefined drainage. 283 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 mill register the peak stage occurring between inspections of the gage . A stage-discharge relation for each gage is developed from discharge measurements made by indirect measurements of peak flow or by current meter. The date of the maximum discharge is not always certain but is usually determined by comparison with nearby continuous- record stations, weather record, or local inquiry. Only the maximum discharge for each water year is given. Infor­ mation on some lower floods may have been obtained, and discharge measurements may have been made for purposes of establishing the stage-discharge relation, but these are not published herein. The years given in the period of rec­ ord represent years for which the annual maximum has been determined. Annual maximum discharge at crest-stage partial-record stations during water year 1934 Annual maximum Station number Station name Location Drainage area sq mi (sq km) Period of record Date Gage height ft (5) Dis­ charge cu ft/s (cu m/s) Rio Portuguas basin 50115900 Rio Portugues at Highway 14 at Ponce, PR Let 18 01 09, long 66 36 26, on left downstream side of Highway 14 bridge, 1.7 mi (2.7 km) downstream from Rio Chiquito, and 0.6 mi (0.97 km) northeast of Degetau Plaza in Ponce. 13.6 (48.2) 1963­84 < 8.82 (<2.688) < 1,700 (<48.1) -- -- 284 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA,' WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 NITRO- BIOMASS CHLOR-A CHLOR-3 NITRO- NITRO- NITRO- GEN,AM- CHLORO- PHYTO- PHYTO- GEN, GEN, GEN, MONIA + NITRO- NITRO- PHOS- PHYLL PLANK- PLANK- NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, RATIO TON TON TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PLANK- CHROMO CHROMO (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM DATE AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (UNITS) (UG/L) (UG/L) RIO GUAJATACA BASIN--CONTINUED 50010720 - LAGO GUAJATACA NO.3 NR MOUTH Ng EBRADILLAS,PR (LAT 18 22 05 LONG 066 54 36) OEC , 1983 01... <.10 <.01 .70 .02 .00 2.8 .60 APR , 1984 09... .40 .08 .62 .70 1.1 4.9 .03 .00 12 <.10 JUL 23... <.10 <.01 .20 .02 .00 2.6 <.10 SOLIDS. SOLIDS. MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- SILICA, SUM OF RESIDUE NITRO- STUN, SODIUM, AD- SIUMs LINITY SULFATE RIDE, RIDE, DIS- CONSTI- AT 105 GEN, DIS- DIS- SORP- On- FIELD DIS- DES- DES- SOLVED TUENTS, DEG. Co NITRATE SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED (MG/L DIS- SUS- TOTAL (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L AS SOLVED PENDED (MG/L DATE AS MG) AS NA) AS K) CACO3) AS 504) AS CL) AS F) SI02) (MG/L) (MG/L) AS N) 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS•PR (LAT 18 23 56 LONG 066 55 23) DEC • 1983 01... 3.6 5.9 .2 1.4 125 11 3.0 .20 6.1 160 4 01... 3.8 6.0 .2 1.5 125 11 8.0 .20 9.1 160 APR • 1984 09... 4.0 6.2 .3 1.5 121 11 8.9 .10 6.4 150 <1 09... 4.1 6.4 .2 1.6 138 8.8 8.9 .10 7.7 170 JUL 23... 3.8 5.7 .2 1.3 111 15 9.2 .10 4.5 150 4 23... 3.4 5.1 .2 1.7 144 15 5.9 .10 6.5 180 -- RIO GRANDE DE ARECIBO BASIN--CONTINUED 50020050 - LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18 08 21 LONG 066 44 35) NOV • 1983 30... 4.3 6.3 .4 1.1 62 4.7 .10 17 8 30... 4.4 5.8 .3 1.4 91 12 5.6 .10 17 120 APR , 1984 04... 5.0 6.4 .4 1.0 71 2.7 3.7 <.10 19 98 8 04... 4.6 6.0 .3 1.1 75 1.0 5.7 <AO 19 100 JUL 20... 4.9 6.3 .4 1.1 70 4.2 6.2 <.10 16 98 2 20... 4.7 6.1 .3 1.2 89 2.5 5.3 <.10 20 110 NITRO- BIOMASS CHLOR-A CHLOR-8 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 (MG/L (MG/L (MG/L (MM. (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM DATE 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 WEBRADILLASsPR (LAT 18 23 56 LONG 066 55 23) DEC ' 1983 01... <.01 <.10 <.01 1.1 .01 .00 1.8 .50 01... -- APR • 1984 09... <.01 <.10 <.01 .40 <.01 .00 4.7 <.10 09... JUL 23... <.01 <.10 <.01 .30 .03 .00 3.6 <AO 23... 285 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 lass than quarterly. WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, COLT- STREP- SPE- 3IS- FORM, TOCOCCI NITRO- NITRO- CIFIC SOLVED FECAL, FECAL, GEN, GEN. SAM- CON- PH OXYGEN, (PER- 0.7 KF AGAR NITRATE NITRITE PIING DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. TOTAL TOTAL TIME DEPTH ANCE ARD ATURE SOLVED SATUR- (COLS./ PER (MG/L (MG/L DATE (FEET) (UMHOS) UNITS) (DEG C) (MG/L) ATIDN) 100 ML) 100 ML) AS N) AS N) RIO GUAJATACA BASIN 50010720 - LAGO GUAJATACA NO.3 NR MOUTH NR QUEBRAOILLAS.PR (LAT 13 22 05 LONG 066 54 3b) OEC , 1983 01... 0825 1.00 267 7.9 25.5 7.5 94 K9 60 (.01 APR , 1984 09... 1445 1.00 303 7.8 22.5 7.7 102 110 74 .33 .02 JUL 23... 1540 1.00 278 8.2 23.5 3.3 109 K6 K1 <.01 OXYGEN. COLI- STREP- SPE- DIS- FORM, TOCOCCI HARD- CIFIC SOLVED FECAL, FECAL, HARD- NESS, CALCIUM SAM- CON- PM OXYGEN. (PER- 0.7 KF AGAR NESS NONCAR- DIS- PLING DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. (MG/L 30NATE SOLVED TIME DEPTH ANCE ARD ATURE SOLVED SATUR- (COLS./ PER AS (MG/L (MG/L DATE (FEET) (UMHOS) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CAC03) CAC03) AS CA) 50010790 - LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18 23 56 LONG 066 55 23) DEC , 1983 01... 0915 1.00 277 7.5 26.0 7.4 93 K1 28 130 7 47 01... 0920 60.0 332 7.9 24.5 .1 1 140 13 49 APR , 1984 09... 1545 1.00 270 8.1 27.0 8.4 108 K11 61 130 6 44 09... 1610 44.0 291 7.6 25.0 .0 0 140 1 49 JUL 23... 1345 1.00 262 8.5 23.5 9.7 128 K4 <1 120 7 41 23... 1415 62 312 7.5 24.5 .4 5 -- 150 5 54 RIO GRANDE DE ARECIBO BASIN 50020050 - LAGO GARZAS NO.1 NR DAM NR ADJUNTAS.PR (LAT 18 08 21 LONG 066 44 35) NOV , 1983 30... 1250 1.00 147 7.4 23.0 7.0 89 K4 K4 60 0 17 30... 1305 97.5 180 6.9 20.5 .0 0 -- 66 0 19 APR , 1984 04... 1530 1.00 148 8.2 25.0 8.3 110 K11 K9 66 0 13 04... 1535 70.0 150 6.9 21.0 .0 0 -- 64 0 18 JUL 20... 1500 1.00 154 8.0 25.5 8.3 111 76 K13 63 0 17 20... 1515 61 183 7.1 21.0 .4 5 -- -- 69 0 20 K = non-ideal count -- -- -- -- -- -- -- -- -- 287 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM DATE AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (UNITS) (UGIL) (UG/L) RIO GRANDE DE ARECI30 BASIN--CONTINUED 50020050 LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18 03 21 LONG 066 44 35) NOV , 1933 30... <.01- <.10 <.01 .80 <.01 .00 5.4 1.1 30... APR , 1984 04... .01 <.10 .07 .33 .40 <.01 .00 2.5 .90 04... -- JUL 20... <.01 <.10 .36 .34 .40 <.01 .00 1.2 <.10 20... -- -- -- -- -- -- OXYGEN, COLI- STREP- SPE- DIS- FORM, TOCOCCI NITRO- NITRO- CIFIC SOLVED FECAL, FECAL, GEN, GEN, SAM- CON- P4 OXYGEN, (PER- 0.7 KF AGAR NITRATE NITRITE PLING DUCT- (STAND- TEMPER- ors- CENT UM-MF (COLS. TOTAL TOTAL TIME DEPTH ANCE ARO ATURE SOLVED SATUR- (COLS./ PER (MG/L (MG/L DATE (FEET) (UMHOS) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) AS N) AS N) RIO GRANDE DE ARECIBO BASIN-CONTINUED 50025110 - LAGO DOS BOCAS NO.3 AT WEST BRANCH NR UTUADO,PR (LAT 18 19 15 LONG 066 40 11) DEC • 1983 01... 1235 1.00 203 8.2 27.5 8.7 111 44 3? .49 .01 APR • 1984 05... 0945 1.00 218 8.0 27.0 7.3 93 25 K7 .01 JUL 17... 1630 1.00 222 9.3 29.0 12.2 160 K14 K2 (.01 OXYGEN, COLI- STREP- SPE- DIS- FORM, TOCOCCI HARD- CIFIC SOLVED FECAL, FECAL, HARD- NESS, CALCIUM SAM- CON- PH OXYGEN, (PER- 0.7 KF AGAR NESS NONCAR- DIS- PLING DUCT- (STAND- TEMPER- ors- CENT UM-MF (COLS. (MG/L BONATE SOLVED TIME DEPTH ANCE ARD ATURE SOLVED SATUR- (COLS./ PER AS (MG/L (MG/L DATE (FEET) (UMHOS) UNITS) (DEG C) CMG/L) ATION) 100 ML) 100 ML) CAC03) CAC03) AS CA) 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) )EC , 1983 01... 1315 1.00 186 7.9 27.0 8.2 104 K14 59 69 3 18 01... 1320 83.0 189 6.9 24.5 1.3 16 -- 71 0 19 APR , 1984 10... 1040 1.00 218 8.6 27.5 10.0 128 K5 K6 81 3 21 10... 1055 81.0 208 7.0 24.5 .0 0 -- 80 0 21 JUL 17... 1530 1.00 219 9.3 29.5 13.1 173 K7 K5 77 3 20 17... 1540 83 208 7.3 25.5 .3 4 77 0 21 OXYGEN, COLI- STREP­ SPE- OM"' FORM, TOCOCCI NITRO- NITRO* C/FIC SOLVED FECAL, FECAL, GEN, GEN, SAM CON- PH OXYGEN, (PEW.. 0.7 KF AGAR NITRATE NITRITE PLING DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. TOTAL TOTAL TIME DEPTH ANCE ARO ATURE SOLVED SATUR.". (COLS./ PER (MG/L (MG/L DATE (FEET) (UMNOS) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) AS N) AS N) RIO DE LA PLATA BASIN 50039900 •••• LAGO CARITE NO.3 ON RID DE LA PLATA MR CAYEY,PR (LAT 18 05 04 LONG 066 06 03) DEC . 1983 02... 1050 1.00 103 7.0 24.0 6.8 86 K5 88 <.01 APR • 1984 11... 1140 1.00 106 7.6 25.0 7.8 95 K10 26 <.01 JUL 19... 1425 1.00 103 8.4 27.0 9.5 127 K5 <1 -- <.01 K 41. non-idool count 288 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, COLT- STREP- SPE­ DIS- FORM, TOCOCCI HARD­ CIFIC SOLVED FECAL• FECAL, HARD- NESS, CALCIUM SAM- CON- PH OXYGEN, (PER- 0.7 KF AGAR NESS NONCAR­ DIS­ PLING DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. (MG/L BONATE SOLVED TIME DEPTH ANCE ARD ATURE SOLVED SATUR- (COLS./ PER AS (MG/L (MG/L DATE (FEET) (UMHOS) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CAC03) CAC03) AS CA) 50039950 - LAGO CARITE NO.1 NR DAM NR CAYEY.PR (LAT 18 04 39 LONG 066 06 19) DEC • 1983 02... 1030 1.00 105 7.2 24.0 6.9 37 K5 81 30 0 5.9 02... 1035 65.0 183 6.6 22.0 .1 1 30 a 5.8 APR , 1984 11... 1120 1.00 106 7.5 25.0 7.5 91 K6 79 31 0 6.0 11... 1125 64.0 103 6.8 21.5 .0 0 26 0 5.5 JUL 19... 1250 1.00 104 8.4 27.0 10.1 135 K3 <1 28 0 5.2 19... 1310 60 148 6.8 22.0 .6 7 31 0 6.6 NITRO- BIOMASS CHLOR-A CHLOR-B NITRO- NITRO- NITRO- GEN,AM- CHLORO- PHYTO- PHYTO- GEN, GEN, GEN, MONIA + NITRO- NITRO- PHOS- PHYLL PLANK- PLANK- NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, RATIO TON TON TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PLANK- CHROMO CHROMO (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM DATE AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (UNITS) (UG/L) (UG/L) RIO GRANDE OE ARECIB3 BASIN--CONTINUED 50025110 LAGO DOS BOCAS NO.3 AT WEST BRANCH NR UTUADO,PR (LAT 18 19 15 LONG 066 40 11) DEC • 1983 01... .50 (.01 1.4 1.9 8.4 .04 .00 5.0 1.1 APR • 1984 05... <.10 (.01 .70 <.01 .00 6.3 <.10 JUL 17... <.10 .02 .48 .50 .02 .00 1.7 <AO SOLIDS, SOLIDS• MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- SILICA, SUM OF RESIDUE NITRO- SIUM• SODIUM• AD- SIUM, LINITY SULFATE RIDE, RIDE• DIS- CONSTI- AT 105 GEN, DIS- DIS- SORP- DIS- FIELD DIS- OIS- DIS- SOLVED TUENTS• DEG. C• NITRATE SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED (MG/L DIS- SUS- TOTAL (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L AS SOLVED PENDED (MG/L DATE AS MG) AS NA) AS K) CAC03) AS SO4) AS CL) AS F) SI02) CMG/L) (MG/L) AS N) 50027090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18 20 09 LONG 066 40 04) DEC • 1983 01... 5.8 9.9 .5 1.9 66 14 10 .20 17 120 7 01... 5.7 9.1 .5 1.9 72 10 9.8 .10 20 120 APR • 1984 10... 6.9 12 .6 1.8 78 17 12 .10 11 130 4 10... 6.6 11 .6 1.9 79 13 11 <.10 18 130 JUL 17... 6.6 11 .6 2.0 74 17 11 .10 2.6 110 16 17... 6.0 9.6 .5 2.2 80 12 10 .10 13 120 NITRO- BIOMASS CHLOR-A CHLOR-B NITRO- NITRO"' NITRO- GEN.AM- CHLORO"' PHYTO- PHYTO- GEN• GEN• GEN. MONIA + NITRO- NITRO- PHOS- PHYLL PLANK- PLANK- NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN• PHORUS, RATIO TON TON TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PLANK- CHROMO CHROMO (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM DATE AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (UNITS) (UG/L) (UG/L) RIO OE LA PLATA BASIN--CONTINUED 50039900 LAGO CARITE NO.3 ON RIO DE LA PLATA NR CAYEY•PR (LAT 18 05 04 LONG 066 06 03) DEC • 1983 02... <.10 <.01 1.1 .01 .00 6.8 2.4 APR • 1984 11... <.10 <.01 . 50 .09 .00 3.2 .40 JUL 19... <.10 <.01 . 20 <.01 .00 2.4 (.10 K a non-ideal count -- 289 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- SILICA, SUM OF RESIDUE NITRO- SIUM, SODIUM, AD- SLUM, LINITY SULFATE RIDE, RIDE, DIS- CONSTI- AT 105 GEN, DIS- On- SORP- DIS- FIELD On- DIS- DIS- SOLVED TUENTS, DEG. C. NITRATE SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED (MG/L DIS- SUS- TOTAL (MG/L (MG/L RATIO (MG/L AS (NG/L (MG/L (MG/L AS SOLVED PENDED (MG/L DATE AS MG) AS NA) AS K) CAC03) AS SO4) AS CL) AS F) SI02) (MG/L) (MG/L) AS N) RIO DE LA PLATA BASIN--CONTINUE) 50039950 LAGO CARITE NO.1 NR DAM NR CAYEY.PR (LAT 18 04 39 LONG 066 06 19) DEC , 1983 02... 3.6 8.7 .7 .70 36 3.5 9.5 <.10 18 71 5 02... 3.7 8.5 .7 .80 33 3.7 9.4 <.10 19 71 APR , 1984 11... 3.8 8.6 .7 .30 3o 2.5 8.7 <.10 19 71 <1 11... 3.1 7.2 .6 .90 36 2.2 7.8 <.10 16 64 JUL 19... 3.7 8.3 .7 .30 34 4.5 9.6 (.10 17 69 4 19... 3.6 7.4 .6 1.0 50 1.6 9.4 <.10 18 78 -- NITRO- BIOMASS CHLOR-A CHLOR-S NITRO- NITRO- NITRO- NITRO- GEN.AM- CHLORO- PHYTO- PHYTO- GEN, GEN, GEN, GEN, MONIA 4' NITRO- NITRO- PHOS- PHYLL PLANK- PLANK- NITRITE NO241103 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, RATIO TON TON TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PLANK- CHROMO CHROMO (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM DATE AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (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 , 1983 01... (.01 .40 <.01 .90 1.3 5.8 .03 .00 4.0 1.4 01... APR s 1934 10... (.01 <.10 .02 .58 .60 <.01 .00 9.5 <.10 -- ...- 10... - JUL 17... <.01 <.10 (.01 .80 <.01 .00 <.10 (.10 17... R/0 DE LA PLATA BASIN--CONTINUED 50039950 LAGO CARITE N0.1 NR DAM NR CAYEY.PR (LAT 18 04 39 LONG 066 06 19) DEC . 1983 02... <.01 <.10 <.01 1.1 .010 .00 6.4 2.2 ...... -- 02... -- ...- APR , 1984 11... <.01 <.10 <.01 .60 .030 .00 3.4 .60 -... ..- 11... -- JUL 19... <.01 (.10 .02 .48 .50 .010 .00 1.6 <.10 1 9... OXYGEN, COLI- STREP- SPE- DIS'" FORM, TOCOCCI NITRO- NITRO- CIFIC SOLVED FECAL. FECAL, GEN, GEN, SAM- CON- PH OXYGEN. (PER- 0.7 KF AGAR NITRATE NITRITE PIING DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. TOTAL TOTAL TIME DEPTH ANCE ARD ATURE SOLVED SATUR- (COLS.! PER (MG/L (MG/L DATE (FEET) (UMHOS) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) AS N) AS N) RIO DE LA PLATA BASIN--CONTINUED 50044400 LAGO LA PLATA NO.5 NR MOUTH NR NARANJITO, PR (LAT 18 19 33 LONG 066 12 28) NOV , 1983 29... 1115 1.00 335 8.1 26.0 7.2 89 23 66 .56 .04 APR , 1984 03... 1500 1.00 357 7.7 27.0 7.3 92 23 66 <.01 JUL 13... 1445 1.00 289 7.8 29.5 10.1 133 K130 80 .47 .03 K = non-ideal count -- -- 290 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 OXYGEN, COLI- STREP- SPE- DIS- FORM, TOCOCCI HARD- CIFIC SOLVED FECAL, FECAL, HARD- NESS. CALCIUM SAM- CON- PH OXYGEN, (PER.. 0.7 KF AGAR NESS NONCAR- DIS- PLING DUCT- (STAND- TEMPER- On- CENT UM-MF (COLS. (MG/L BONATE SOLVED TIME DEPTH ANCE ARD ATURE SOLVED SATUR- (COLS./ PER AS (MG/L (MG/L DATE (FEET) (UMHOS) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CAC03) CAC03) AS CA) 50044950 LAGO LA PLATA NO.3 NR DAM NR N4RANJITO• PR (LAT 18 20 18 LONG 066 14 01) NOV , 1983 29... 1020 1.00 297 7.3 26.0 4.9 61 62 50 110 3 26 29... 1030 13.0 300 7.3 25.5 2.1 26 110 0 26 APR • 1984 03... 1350 1.00 307 7.0 27.0 2.9 37 62 50 130 0 31 03... 1415 75.0 284 7.0 23.0 .0 -- 100 0 25 JUL 13... 1230 1.00 350 7.5 29.5 5.5 72 64 140 130 0 31 13... 1245 78 228 7.1 24.0 .3 4 -- 75 4 18 OXYGEN, COLI- STREP- SPE- DIS- FORM, TOCOCCI NITRO- NITRO* CIFIC SOLVED FECAL, FECAL, GEN, GEN, SAM- CON- PH OXYGEN, (PER- 0.7 KF AGAR NITRATE NITRITE PLING DUCT- (STAND- TEMPER- ors- CENT UM-MF (COLS. TOTAL TOTAL TIME DEPTH ANCE ARD ATURE SOLVED SATUR- (COLS./ PER (MG/L (MG/L DATE (FEET) (UMHOS) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) AS N) AS N) RIO GRANDE DE LOIZA 3ASIN 50057500 LAGO LOIZA NO.4 NR MOUTH NR CAGUAS, PR (LAT 18 16 51 LONG 066 00 35) DEC , 1983 5... 1055 1.00 247 7.4 26.5 6.5 81 K790 170 .74 .06 APR r 1984 6... 1250 1.00 370 7.0 27.0 8.1 103 K100 950 .31 .09 JUL 16... 1240 1.00 274 7.6 29.0 6.0 78 K950 49 .47 .23 OXYGEN, COLT- STREP- SPE- DIS- FORM, TOCOCCI HARD- CIFIC SOLVED FECAL, FECAL, HARD- NESS, CALCIUM SAM- CON- PH OXYGEN, (PER- 0.7 KF AGAR NESS NONCAR- DIS. PLING DUCT- (STAND- TEMPER- DIS- CENT UM-MF (COLS. (MG/L BONATE SOLVED TIME DEPTH ANCE ARD ATURE SOLVED SATUR- (COLS./ PER AS (MG/L (MG/L DATE (FEET) (UMHOS) UNITS) (DEG C) (MG/L) ATION) 100 ML) 100 ML) CAC03) CAC03) AS CA) RIO GRANDE DE LOIZA BASIN-CONTINUED 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18 19 29 LONG 066 00 47) DEC • 1983 05... 1015 1.00 246 7.1 26.5 3.9 49 410 600 77 0 19 05... 1020 33.0 157 6.7 23.5 2.0 24 57 2 14 APR , 1984 06... 1145 1.00 280 7.2 27.5 7.7 98 K30 K82 80 0 19 06... 1200 24.0 300 6.8 26.5 .2 3 75 0 18 JUL 16... 1330 1.00 256 7.7 29.5 8.3 109 110 62 75 0 19 16... 1350 30 209 6.8 26.0 .5 6 60 0 15 NITRO- BIOMASS CHLOR-A CHLOR-B NITRO- NITRO- NITRO- GEN•AM- CHLORO- PHYTO- PHYTO- GEN• GEN, GEN. MONIA + NITRO- NITRO- PHOS- PHYLL PLANK.'.. PLANK NO2+NO3 AMMONIA ORGANIC ORGANIC GEN• GEN• PHORUS• RATIO TON TON TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PLANK- CHROMO CHROMO (MG/L (MG/L (PIM (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM DATE AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (UNITS) (UG/L) (UG/L) RIO DE LA PLATA BASIN--CONTINUED 50044400 LAGO LA PLATA NO.5 NR MOUTH NR NARANJITO. PR (LAT 18 19 33 LONG 066 12 28) NOV • 1983 29... .60 .16 .64 .80 1.4 6.2 .18 .00 22 3.2 APR • 1984 03... .10 .06 .84 .90 1.0 4.4 .14 .00 8.8 2.8 JUL 13... .50 .02 1.9 1.9 2.4 11 .19 .00 12 <.10 K = non-ideal count 291 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIALRECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 SOLIDS, SOLIDS, MAGNE- SODIUM POTAS- ALKA- CHL1- FLUO- SILICA. SUM OF RESIDUE NITRO- SIM, SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE. DIS- CONSTI- AT 105 GEN, DIS- DIS- SORP- DIS- FIELD DIS- DIS- DIS- SOLVED TUENTS. DEG. C. NITRATE SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED (MG/L On- SUS- TOTAL (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L AS SOLVED PENDED (MG/L DATE AS MG) AS NA) AS K) CAC03) AS 504) AS CL) AS F) SI02) (MG/L) (MG/L) AS N) 50044950 LAGO LA PLATA NO.3 MR DAM NR NARANJITO, PR (LAT 18 20 18 LONG 066 14 01) NOV , 1933 29... 11 29 .9 2.7 107 15 20 .20 20 180 4 29... 11 13 .8 2.7 110 15 20 .20 20 180 APR . 1934 03... 12 21 .8 1.1 133 14 23 .10 21 200 <1 03... 9.5 15 .7 3.1 103 9.6 21 .10 20 170 JUL 13... 13 23 .9 3.4 134 19 26 .20 20 220 10 13... 7.2 14 .7 3.4 71 13 17 .20 16 130 -- NITRO- BIOMASS CHLOR-A CHLOR-B NITRO- NITRO- NITRO- GEN.AM- CMLORO- PHYTO- PHYTO.". GEN, GEN, GEN. MONIA + NITRO- NITRO- PHOS- PHYLL PLANK- PLANK- NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, RATIO TON TON TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL PLANK- CHROMO CHROMO (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM DATE 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 NR MOUTH NR CAGUAS, PR (LAT 18 16 51 LONG 066 00 35) DEC , 1983 5... .80 .02 1.4 1.4 2.2 9.7 .22 .00 18 3.7 APR , 1984 6... .40 1.8 1.5 3.3 3.7 16 .70 .00 16 3.5 JUL 16... .70 .51 1.4 1.9 2.6 12 .39 .00 9.0 <.10 SOLIDS, SOLIDS, MAGNE- SODIUM POTAS- ALKA- CHLO- FLUO- SILICA. SUM OF RESIDUE NITRD STUMP SODIUM, AD- SIUM, LINITY SULFATE RIDE, RIDE, DIS- CONSTI- AT 105 GEN, DIS- DIS- SORP- DIS- FIELD DIS- On- 015- SOLVED TUENTS, DEG. C. NITRATE SOLVED SOLVED TION SOLVED (MG/L SOLVED SOLVED SOLVED (MG/L DIS- SUS- TOTAL (MG/L (MG/L RATIO (MG/L AS (MG/L (MG/L (MG/L AS SOLVED PENDED (MG/L DATE AS MG) AS NA) AS K) CACO3) AS SO4) AS CL) AS F) SI02) (MG/L) (MG/L) AS N) 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO. PR (LAT 18 19 29 LONG 066 00 47) DEC s 1983 05... 7.2 20 1 2.8 77 17 19 .20 23 150 8 .69 05... 5.3 14 .8 3.0 55 14 15 .20 17 120 -- APR r 1984 06... 7.8 22 1 1.9 85 18 23 .20 23 170 a .16 06... 7.3 20 1 2.1 82 17 21 .20 22 160 -... JUL 16... 6.8 20 1 2.7 75 19 21 .20 27 160 7 .72 16... 5.5 12 .7 2.9 67 9.5 13 .10 18 120 -- -- -- 292 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 NITRO- BIOMASS CHLOR-A CHLOR-3 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 GEM , G EM . PHORUS. RATIO TON TON TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAN L TOTAL PLANK- CHROMO CHROMO (MG/L (MG/L (MG/L (MG/L (MG/L(M/L (MG/L (MG/L TON FLUOROM FLUOROM DATE AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) (UNITS) (UG/L) (UG/L) RIO DE LA PLATA IASIN--CONTINUED 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITOr PR (LAT 18 20 18 LONG 066 14 01) NOV , 1983 29... <.01 <.10 <.01 .70 .09 .00 21 3.2 29... APR • 1984 03... <.01 <.10 <.01 .70 .06 .00 4.1 .70 03... -- -- -- -- -- -- -- -- JUL 13... <.01 <.10 .01 1.1 1.1 .14 .00 4.5 <.10 13... -- NITRO- BIOMASS CHLOR-A CHLOR-3 NITRO- NITRO- NITRO- NITRO- GENrAM- 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 (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L TON FLUOROM FLUOROM DATE 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 50058800 - LAGO LOIZA N3.7 MR DAM MR TRUJILLO ALTOr PR (LAT 18 19 29 LONG 066 00 47) DEC f 1983 5... .01 .70 .13 .97 1.1 1.8 8.0 .19 .00 7.1 1.4 05... -- -- -- -- -- -- -- -- -- -- - APR • 1984 6... .04 .20 .02 .48 .50 .70 3.1 .12 .00 15 2.1 06... JUL 16... .18 .90 .05 .55 .60 1.5 6.6 .29 .00 8.5 <.10 16... 293 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 CHLOR- DI- DI- ENDO"' PCB. ALORIN, DANE. DOD. DOE, DDT, AZINON. ELDRIN SULFAN, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL GATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) RIO GUAJATACA BASIN 50010790 LAGO GUAJATACA NO.1 NEAR DAM NEAR QUEBRADILLASrPR (LAT 18 23 56 LONG 066 55 23) JUL • 1914 23... 1345 (.1 <.01 <.1 <.01 <.01 <.01 <.01 <.01 <.01 RIO GRANDE DE ARECIBO BASIN 50020050 LAGO GARZAS NO.1 NEAR DAM NEAR ADJUNTAS•PR (LAT 18 08 21 LONG 066 44 35) JUL • 1984 20... 1500 <.1 <.01 <.1 <.01 <.01 <.01 <.01 <.01 <.01 50027090 LAGO DOS BOCAS NO.1 NEAR DAM NEAR UTUA00,PR (LAT 18 20 09 LONG 066 40 04) JUL • 1984 17... 1530 <.1 <.01 <.1 <.01 <.01 <.01 <.01 <.01 <.01 RIO DE LA PLATA BASIN 50039950 LAGO CARITE NO.1 NEAR DAM NEAR CAYEY.PR (LAT 18 04 39 LONG 066 06 19) JUL • 1984 19... 1250 (.1 <.01 <.1 <.01 <.01 <.01 <.01 <.01 <.01 50044950 LAGO LA PLATA NO.3 NEAR DAM NEAR NARANJITO. PR (LAT 18 20 18 LONG 066 14 01) JUL • 1984 13... 1230 <.1 <.01 <.1 <.01 <.01 <.01 <.01 <.01 <.01 RIO GRANDE DE LOIZA BASIN 50058800 LAGO LOIZA NO.7 NEAR DAM NEAR TRUJILLO ALTO, PR CLAT 18 19 29 LONG 066 00 47) JUL • 1984 16... 1330 <.1 <.01 <.1 <.01 <.01 <.01 .03 <.01 <.01 294 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATAr WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION. CHLOR, THION, THION. MIREX. TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) RIO GUAJATACA BASIN--CONTINUE1 50010790 LAGO GUAJATACA NO.1 NEAR DAM NEAR QUEBRADILLAS,PR (LAT 18 23 56 LONG 066 55 23) JUL r 1984 23... <.01 <.01 <.01 <.01 <.01 <.01 (.01 (.01 (.01 <.01 RIO GRANDE DE ARECIBO 3ASIN--CONTINUED 50020050 LAGO GARZAS NO.1 NEAR DAM NEAR ADJUNTAS,PR (LAT 18 08 21 LONG 066 44 35) JUL , 1984 20... <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 50027090 LAGO DOS BOCAS NO.1 NEAR DAM NEAR UTUADO.PR (LAT 18 20 0? LONG 066 40 04) JUL , 1984 17... <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 RIO DE LA PLATA BASIN- -CONTINUED 50039950 LAGO CARITE NO.1 NEAR DAM NEAR CAYEY.PR (LAT 18 04 39 LONG 066 06 19) JUL 6, 1984 19... <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 50044950 - LAGO LA PLATA NO.3 NEAR DAM NEAR NARANJITO, PR (LAT 18 20 18 LONG 066 14 01) JUL r 1984 13... - <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 <.01 RIO GRANDE DE LOIZA BASIN ~CONTINUED 50058800 - LAGO LOIZA NO.7 NEAR DAM NEAR TRJJILLO ALTO, PR (LAT 18 19 29 LONG 066 00 47) JUL r 1984 16... <.01 <.01 <.01 <.01 <.01 .02 <.01 <.01 (.01 <.01 295 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE. TRI- 2,4-Or 2.4,5-T 2. 4-DP SILVEX, TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL DATE (UG/L) (UG/L) (UG/L) (UG/L) (U;/L) (UG/L) (UG/L) (UG/L) (UG/L) RIO GUAJATACA BASIN-CONTINUED 50010790 LAGO GUAJATACA NO.1 NEAR DAM NEAR QUEBRADILLAS.PR (LAT 18 23 56 LONG 066 55 23) JUL r 1984 23... <.01 <.10 <.1 <1 (.01 <.01 .08 (.01 <.01 50020050 LAG :-.ARZAS NO.1 NEAR DAM NEAR ADJUNTAS,PR (LAT 18 08 21 LONG 066 44 35) JUL r 1484 20... <.01 <.10 <.1 <1 <.01 <.01 <.01 <.01 (.01 50027090 LAGO DOS BOCAS NO.1 NEAR DAM NEAR UTUADOrPR (LAT 14 20 09 LONG 066 40 04) JUL . 1984 17... <.01 <.10 <.1 <1 (.01 <.01 (.01 <.01 <.01 RIO OE LA PLATA BASIN-CONTINUED 50039950 - LAGO CARITE NO.1 NEAR DAM NEAR CAYEY.PR (LAT 18 04 39 LONG 066 06 19) JUL r 1984 19... <.01 <.10 <.1 <1 <.01 <.01 (.01 <.01 <.01 50044950 LAGO LA PLATA NO.3 NEAR DAM NEAR NARANJITOr PR (LAT 18 20 18 LONG 066 14 01) JUL r 1984 13... <.01 <AO <.1 <1 (.01 <.01 <.01 <.01 <.01 RIO GRANDE DE LOIZA BASIN--CONTINUED 50058800 LAGO LOIZA NO.7 NEAR DAM NEAR TRUJILLO ALTO. PR (LAT 18 19 29 LONG 066 00 47) JUL r 1984 16... <.01 <.10 <.1 <1 C.01 .19 (.01 <.01 <.01 15 67°15 67°00' 30' 15' 66°00' 4 65°30' OCEAN° ATLANTIC a1aOc2* e% 4P S* C4S, 168 ,0e51 v0 X10 169 4rj. 1 69 to 8°30' 615 Rio Culebrina Rio Guayabo Rio Grand Rio Fajardo Rio Grande de Masco Rio Yaguez Rio Daguao Quebrada Palma Rio Guanallbo \ Rio Santiago Rio Bianco Rio Antoll Ruiz Rio Humacao Rio Guayandi izsc,ocv 4 beis se60 60 " .1 4 \0 of& . /,, 1 ep .44 sz. voc:3 0-‘ 4:"+'-`1" etee .° (gou\ovc02' ‘2147 0 \o o- 4z) .gb 42.• OA cv 40+ 6e 00v 00 ‘0 46 0 cx0 00vo J s° 0148 fi1/4%- C.1 ik 60 0 i" vo <Z. ir.‘ 00 00 4t. V5 (k 1/0 4 EXPLANATION 7°45 ip 2p 3p KILOMETERS • 2 WELL AND WELL NUMBER 0 10 20 MILES MAR CARIBE Figure 25.--Location of ground-water stations in Puerto Rico. GROUND-WATER LEVELS RIO GUAJATACA BASIN 182538067015900. Local number, 164. LOCATION.--Lat 18°25'38", long 67°01'59". Owner: P.R. Aqueduct and Sewer Authority. Name: Rocha Moca. AQUIFER.--Aymamein Limestone. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 12 in (0.30 m), cased 0-100 ft (0-30.49 m), perforated 100-160 ft (30.49-48.78 m), diameter 10 in (0.25 m), cased 0-140 ft (0-42.68 m), perforated 140-200 ft (42.68-61.0 m), gravel packed 120-200 ft (36.58-61.0 m). Depth 200 ft (61.0 m). DATUM.--Altitude of land-surface datum is about 787 ft (240 m) above mean sea level. Measuring point: Upper edge of 1.5 in (0.04 m) pipe on pump base, 1.40 ft (0.43 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--January 18, 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 144.7 ft (44.12 m) below land-surface datum, Nov. 3, 1983; lowest water level measured, 176.1 ft (53.69 m) below land-surface datum, Feb. 18, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Date Oct. 5 Nov. 3 Dec. 7 Water level al48.4 a144.7 al47.4 Date Jan. 11 Feb. 8 Mar. 5 Water level a148.5 148.2 148.3 Date Apr. 4 May 3 June 6 Water level a148.6 a151.3 a147.1 Date July 11 Aug. 27 Sept. 6 Water level al46.7 al48.1 a148.2 182422067015100. Local number, 165. LOCATION.--Lat 18°24'22", long 67°01'51". Owner: P.R. Aqueduct and Sewer Authority. Name: Mateo Perez - Bo. Saltos. AQUIFER.--Cibao Formation, Guajataca member. WELL CHARACTERISTICS.--Drilled production water-table well, diameter 16 in (0.40 m), cased 16 in (0.40 m) 0-40 ft (0-12.2 m), cased 12 in (0.30 m) 40-200 ft (12.20-60.98 m). Depth 200 ft (61.0 m). DATUM: Altitude of land-surface datum is about 672 ft (205 m) above mean sea level. Measuring point: Hole on top of pump base, 1.00 ft (0.30 in) above land-surface datum. REMARKS.--Pumping discontinued. Abandoned observation well. PERIOD OF RECORD.--January 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 68.38 ft (20.85 m) below land-surface datum, Nov. 8, 1982; lowest water level measured, 70.60 ft (21.52 m) below land-surface datum, June 18, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 5 69.46 Jan. 11 69.30 Apr. 4 69.22 July 11 69.42 Nov. 3 69.35 Feb. 8 69.29 May 3 69.30 Aug. 27 69.18 Dec. 7 68.38 Mar. 5 69.27 June 6 69.13 Sept. 6 69.08 a Pumping. 299 300 GROUND-WATER LEVELS RIO GRANDE DE ARECIBO BASIN 181038066441201. Local number, 86. LOCATION.--Lat 18°10'38", long 66°44'12". Owner: Joaquin Mattei - U.S. Geological Survey. Name: Adjuntas. AQUIFER.--Alluvium of Quaternary Age and volcanic rock of Eocene Age. WELL CHARACTERISTICS.--Drilled test well, diameter 6 in (15 cm). Depth 300 ft (91.46 m). DATUM.--Altitude of land-surface datum is about 1,460 ft (445 m) above mean sea level. Measuring point: Bottom edge of hole in 6 in (15 cm) casing, 1.45 ft (0.44 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--August 1967 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 4.34 ft (1.32 m) below land-surface datum, Jan. 12, 1979; lowest measured, 12.60 ft (3.84 m) below land-surface datum, May 2, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 26 10.10 Jan. 10 11.14 Apr. 3 12.56 July 9 12.06 Nov. 2 10.57 Feb. 6 12.37 May 2 12.60 Aug. 7 11.58 Dec. 5 11.17 Mar. 2 12.19 June 4 11.18 Sept. 6 9.61 181307066355001. Local number, 123. LOCATION.--Lat 18°13'07", long 66°35'50". Owner: P.R. Aqueduct & Sewer Authority. Name: Jayuya 3. AQUIFER.--Recent alluvium. WELL CHARACTERISTICS.--Drilled for public supply well, diameter 10 in (25 cm), cased 0-27 ft (0-8.23 m), perforated 27-100 ft (8.23- 30.48 m), gravel packed 0-100 ft (0-30.48 m). Depth 100 ft (30.88 m). DATUM.--Altitude of land-surface datum is about 1,400 ft (427 m) above mean sea level. Measuring point: Lower edge of 0.75 in (1.90 cm) pipe on concrete pump base, 1.40 ft (0.43 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--Jan. 15, 1976 to July 21, 1977, Jan. 15, 1980 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 10.73 ft (3.27 m) below land-surface datum, May 30, 1980; lowest measured, a49.36 ft (a15.04 m) below land-surface datum, Apr. 21, 1976. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 26 13.05 Jan. 10 14.39 Apr. 3 15.43 July 9 15.02 Nov. 20 13.24 Feb. 19 15.25 May 5 15.45 Aug. 6 15.38 Dec. 5 14.64 Mar. 11 15.40 June 4 14.75 Sept. 30 13.72 182632066384800. Local number, 161. LOCATION.--Lat 18°26'32", long 66°38'48". Owner: P.R. Aqueduct and Sewer Authority. Name: Santana #2 AQUIFER.--Aymamtin Limestone. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 12 in (0.30 m), cased 0-180 ft (0-54.88 m), diameter 10 in (0.25 m), perforated 175-220 ft (53.35-67.07 m). Depth 220 ft (67.07 m). DATUM.--Altitude of land-surface datum is about 148 ft (45.1 m) above mean sea level. Measuring point: Airhole in pump base, 0.90 ft (0.27 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--January 8, 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, a113.7 ft (34.66 m) below land-surface datum, Jan. 8, 1982; lowest water level measured, a152.2 ft (46.40 m) below land-surface datum, May 12, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 7 a138.4 Jan. 23 a132.8 Apr. 17 a142.9 July 18 a134.2 Nov. 23 a132.1 Feb. 21 a132.2 May 29 a132.0 Aug. 1 a129.2 Dec. 14 a133.0 Mar. 23 a133.1 June 4 125.8 Sept. 7 a132.5 a Pumping. 301 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182548066300201. 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 (51 to 30 cm), cased 20 in (51 cm), 8-168 ft (2.44-51.21 m); 12 in (30 cm) 153-206 ft (46.65-62.80 m); perforated 20 in (51 cm) 80-168 ft (24.39-51.21 m), 12 in (30 cm), 153-206 ft (46.65-62.80 m). Depth 212 ft (64.6 m). DATUM.--Altitude of land-surface datum is about 31.4 ft (9.57 m) above mean sea level. Measuring point: Bottom edge of hole in 20 in (51 cm) casing, 3.55 ft (1.08 m) above land-surface datum. REMARKS.--Observation well. Lowest and highest water levels are pumping levels. PERIOD OF RECORD.--October 1960 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, a22.50 ft (a6.86 m) below land-surface datum, June 2, 1965; lowest measured, a37.19 ft (a11.34 m) below land-surface datum, Jan. 15, 1975. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 7 a29.14 Jan. 23 a29.50 Apr. 17 a29.77 July 18 a29.43 Nov. 23 a29.05 Feb. 21 a29.26 May 29 a29.19 Aug. 8 a29.27 Dec. 15 a29.24 Mar. 23 a29.39 June 11 a28.66 Sept. 10 a29.28 182603066333601. 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 m). DATUM.--Altitude of land-surface datum is about 213 ft (64.9 m) above mean sea level. Measuring point: Lower edge of 0.75 in (1.9 cm) pipe in pump base, 3.0 ft (0.91 m) above land surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--March 1960 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, a17.60 ft (a5.36 m) below land-surface datum, June 28, 1983; lowest measured, 226.9 ft (69.17 m) below land-surface datum, Apr. 4, 1963. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 7 a19.82 Jan. 23 al8.90 Apr. 17 a18.16 July 18 a18.57 Nov. 23 a19.67 Feb. 21 a18.22 May 29 a18.20 Aug. 8 a17.92 Dec. 14 a18.80 Mar. 23 al9.15 June 11 a18.39 Sept. 5 a18.64 a Pumping. 302 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182621066343301. 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 (61 cm), cased 0-30 ft (0-9.1 m), diameter 16 5/8 in (42 cm), cased to 0-450 ft (0-137.2 m). Depth 550 ft (167.6 m). DATUM.--Altitude of land-surface datum is 287 ft (87.48 m) above mean sea level. Measuring point: Top of shelter floor, 2.8 ft (0.85 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--November 1979 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level, 276.85 ft (84.38 m) below land-surface datum, Dec. 16, 1981; lowest, 283.9 ft (86.55 m) below land-surface datum, May 3, 1984. WATER LEVIL, IN .EET TELOW LAND-SUQ'ACE DATUM. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEUS DSSERVATICNS AT 1200 DAY ICT NOV DEC JAN FEE MAR APR MAY JUN JUL AUG SEP 1 233.22 233.12 233.46 233.52 233.67 283.59 233.59 283.82 283.62 283.34 233.71 283.59 2 233.23 283.39 233.47 253.53 243.67 233.60 283.59 233.84 233.62 283.85 283.71 283.60 3 233.24 283.09 233.49 283.57 233.65 283.50 233.61 283.35 283.61 283.35 233.71 283.59 4 233.23 283.10 233.51 233.59 233.63 233.59 283.62 283.84 283.63 283.35 233.71 283.60 5 233.19 283.12 233.54 733.61 233.60 283.60 233.64 283.83 233.40 283.33 283.71 283.60 6 283.13 283.11 233.56 283.60 233.60 253.61 233.64 283.13 233.57 283.81 233.69 283.64 7 233.17 233.12 233.57 253.59 283.53 283.61 233.64 233.31 213.55 283.80 283.70 283.65 8 233.17 233.14 233.53 283.50 293.57 283.62 233.63 283.30 283.48 233.82 283.70 283.63 9 233.17 283.17 233.53 283.61 283.51 283.62 283.64 283.78 283.45 283.81 233.70 283.63 10 233.21 283.19 233.53 255.50 293.59 233.61 233.64 233.76 283.47 283.30 283.70 283.62 11 233.20 233.27 253.53 283.53 253.60 233.61 283.61 233.74 283.49 283.82 283.70 283.60 12 233.20 283.29 233.57 233.55 233.61 283.51 233.59 283.71 233.50 283.82 283.68 283.58 13 233.21 233.31 233.57 263.53 253.60 287.50 233.57 283.70 283.57 283.83 283.61 233.53 14 283.22 283.30 213.58 233.53 233.59 233.61 233.55 283.70 233.60 283.83 283.60 283.51 15 233.20 283.28 297.40 283.58 233.53 283.60 233.55 281.76 233.62 283.83 233.59 283.49 16 283.19 283.30 283.40 283.51 233.59 233.58 283.53 283.80 253.63 283.32 283.59 283.47 17 233.15 253.31 233.41 283.64 293.59 283.56 233.62 283.31 233.64 283.31 283.57 283.45 18 233.15 283.33 233.41 283.56 233.53 233.55 233.65 283.81 283.66 233.81 233.56 283.42 19 233.14 283.36 283.42 283.68 233.55 233.55 233.63 283.80 233.62 283.79 233.56 283.38 20 253.12 283.38 287.44 283.69 233.55 283.55 283.71 283.79 283.62 283.77 233.58 283.34 21 283.11 233.39 253.46 283.68 283.55 283.56 213.75 283.79 233.62 283.76 283.60 283.32 22 283.12 283.41 283.48 2e3.66 283.55 283.58 283.76 283.75 283.63 283.75 233.61 283.30 23 253.13 283.44 233.54 253.54 283.57 253.60 283.77 283.74 283.62 283.74 283.61 283.28 24 283.14 283.47 233.54 283.62 233.59 283.61 233.76 283.72 283.64 283.74 283.61 283.28 25 283.15 283.48 233.53 283.62 283.80 233.52 233.74 283.67 233.66 283.74 283.61 283.30 26 233.16 283.48 283.48 283.52 213.61 233.60 283.72 283.64 283.67 283.74 233.60 283.33 27 233.15 283.47 283.46 223.63 233.62 283.59 233.69 283.62 283.70 283.74 283.60 283.39 28 233.16 283.46 283.47 733.65 283.61 233.50 233.69 283.60 283.74 283.72 283.56 283.44 29 283.16 283.46 253.49 283.66 283.60 283.59 233.73 283.60 283.78 283.72 283.56 283.48 30 283.17 283.46 283.50 233.65 --- 283.58 283.79 283.62 283.82 283.72 283.56 283.50 31 233.14 --- 233.50 233.67 183.58 283.63 283.73 283.57 LOW 283.24 293.48 283.53 283.69 233.67 233.62 233.79 283.85 283.82 283.85 283.71 283.65 HIGH 283.11 283.09 233.40 283.52 233.55 283.55 283.55 283.60 293.45 283.72 283.56 283.28 WTR YR 1984 MEAN 282.78 LOW 283.55 HIGH 283.09 277 3 wp 279 61laJ Z - L.- 281 >-(I) 4.1 I -J Z La 283 3 285 SONDJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 1981 1982 1983 1984 303 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182454066315300. Local number, 142. LOCATION.--Lat 18°24'54", long 66°31'53". Owner: P.R. Aqueduct and Sewer Authority. Name: Morgn Sim6. AQUIFER.--Aymamiin Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 m) 0-147 ft (0-44.82 m), cased 20 in (0.51 m) 0-100 ft (0-30.49 m), diameter 16 in (0.41 m) 147-211 ft (44.82-64.33 m), diameter 12 in (0.30 m) 211-320 ft (64.33-97.56 m), cased 12 in (0.30 m) 0-320 ft (0-97.6 m), perforated 248-320 ft (75.6-97.6 m), diameter 10 in (0.25 m) 320-517 ft (97.6-158 m), cased 8 in (0.20 m) 300-517 ft (91.46-158 m), perforated 480-517 ft (146-158 m). Depth 517 ft 158 m). DATUM.--Altitude of land-surface datum is 492 ft (150 m) above mean sea level. Measuring point: top of 1.75 in (0.04 m) hole on top of 3 in (0.08 m) casing, 1.0 ft (0.30 m) above land surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--August 1981 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 226.5 ft (69.05 m) below land-surface datum, May 21, 1982; lowest water level measured, 229.9 ft (70.09 m) below land-surface datum, May 29, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 7 Nov. 23 Dec. 15 228.5 226.6 229.0 Jan. 23 Feb. 21 Mar. 23 228.9 228.8 229.1 Apr. 17 May 29 June 11 229.3 229.9 229.9 July 18 Aug. 8 Sept. 5 229.0 229.0 229.1 182542066305100. Local number, 166. LOCATION.--Lat 18°25'42", long 66°30'51". Owner: P.R. Aqueduct and Sewer Authority. Name: Manati (New well). AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 m), cased 0-100 ft (0-39.49 m), diameter 14 in (0.36 m), cased 0-140 ft (0-42.68 m), slotted 80-90 ft (24.39-27.44 m) and 130-140 ft (39.63-42.68 m). Depth 140 ft (42.68 m). DATUM.--Altitude of land-surface datum is 29.52 ft (9.0 m) above mean-sea level. Measuring point: Top of 14 in (0.36 m) casing, 0.80 ft (0.24 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--January 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 22.90 ft (6.98 m) below land-surface datum, Mar. 3, 1983; lowest water level measured, 26.36 ft (8.04 m) below land-surface datum, Feb. 3, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 7 25.34 Jan. 23 26.05 Apr. 17 25.55 July 18 25.98 Nov. 23 25.17 Feb. 21 25.55 May 29 25.41 Aug. 8 25.96 Dec. 15 25.43 Mar. 23 25.78 June 11 25.53 Sept. 10 25.85 304 GROUND-WATER LEVELS RIO CIBUCO BASIN 182446066194801. 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 public supply artesian well, diameter 16 to 12 in (41 to 30 cm), cased 16 in (41 cm) 0-50 ft (0-15.2 m), 12 in (30 cm) 0-110 ft (0-33.54 m). Depth 210 ft (64.02 m). DATUM.--Altitude of land-surface datum is about 102 ft (31.10 m) above mean sea level. Measuring point: Lower edge of 0.75 in (1.90 cm) pipe in pump base, 1.0 ft (0.30 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--January 1961 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, a75.88ft (a23.13 m) below land-surface datum, Feb. 21, 1984; lowest measured, 137.9 ft (42.04 m) below land-surface datum, Mar. 3, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 7 a98.58 Jan. 23 a97.00 Apr. 17 a95.52 July 18 al06.4 Nov. 23 a112.6 Feb. 21 a75.88 May 29 al02.4 Aug. 8 a108.3 Dec. 15 al10.5 Mar. 23 a82.10 June 12 al00.1 Sept. 5 al08.0 a Pumping. 305 GROUND-WATER LEVELS RIO CIBUCO BASIN 182647066201701. Local number, 70. LOCATION.--Lat 18°26'47", long 66°20'17". Owner: P.R. Aqueduct and Sewer Authority. Name: Sabana Hoyos. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled unused artesian well, diameter 8 in (20 cm), cased 0-90 ft (0-27.43 m), perforated. Depth 90 ft (27.43 m). DATUM.--Altitude of land-surface datum is about 49 ft (14.9 m) above mean sea level. 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, 21.33 ft (6.50 m) below land-surface datum, Oct. 26, 1976; lowest, 31.10 ft (9.48 m) below land-surface datum, July 31, 1975. WATER LEVEL, IN CEET BELOW LAND-SUR'ACE DATUM, W4TE2 YEAR OCTOBER 1983 TO SEPTEMSER 1984 INSTANTANEOUS OBSERVATIONS AT 1230 DAY OCT N3V DEC JAN FES MAR APR MAY JUN JUL 4UG SEP 1 28.9? 28.96 29.18 29.41 29.13 29.65 33.93 30.03 29.71 29.60 2/.68 2 29.00 213.96 24.18 29.40 21.15 29.66 30.31 30.02 29.73 29.60 29.'0 3 29.01 23.96 29.18 29.41 21.03 29.67 30.02 30.02 29.74 29.60 29.71 4 29.01 28.96 29.18 29.43 29.11 29.63 30.33 30.03 29.73 29.61 29.72 5 29.01 28.37 21.19 29.43 29.13 29.70 30.03 39.03 29.73 29.53 29.74 6 29.03 21.19 29.44 29.14 29.71 30.33 29.99 29.71 29.55 29.73 7 29.01 29.20 29.45 21.17 29.74 30.03 29.95 21.71 29.55 29.73 8 29.02 21.21 29.44 29.19 29.76 30.37 29.92 29.70 29.55 29.72 9 29.03 29.22 29.45 21.22 29.77 39.36 29.91 29.70 29.54 29.72 10 29.03 21.23 29.45 29.25 29.77 30.07 29.83 29.70 29.55 29.72 11 29.04 24.24 29.41 29.27 29.73 33.08 29.86 29.66 29.55 29.72 12 29.05 21.24 29.36 29.31 29.79 30.10 29.35 29.62 29.55 29.71 13 14 29.05 29.07 /9.24 29.25 29.31 29.11 21.33 29.35 29.79 29.80 31.11 30.13 29.84 29.84 29.61 27.60 29.55 29.56 29.70 29.57 15 29.07 29.04 29.26 29.12 24.37 29.81 30.13 29.34 29.59 29.56 29.64 16 29.05 29.05 21.27 29.06 21.38 29.32 31.14 29.85 29.55 29.53 29.50 17 29.05 29.05 29.28 29.01 29.39 29.53 30.15 29.74 29.55 29.59 29.57 18 29.02 29.05 29.30 23.95 29.41 29.83 33.14 29.72 29.53 29.59 29.28 19 29.01 29.06 29.31 23.91 29.42 29.35 33.14 29.69 29.55 29.59 29.14 20 28.99 29.05 29.32 28.89 29.45 29.86 33.13 29.67 29.58 29.60 29.04 21 28.99 29.07 29.33 28.90 21.46 29.87 30.13 29.66 29.58 29.62 23.96 22 28.99 29.08 29.33 25.89 29.45 29.90 30.11 29.66 29.56 29.62 23.39 23 28.93 29.09 29.33 28.90 29.50 29.91 30.11 29.65 29.55 29.63 28.33 24 28.97 29.10 29.34 28.91 29.52 29.93 30.09 29.65 29.55 29.63 28.79 25 28.97 29.12 21.34 28.94 24.54 29.93 30.37 29.64 29.55 29.64 28.76 26 28.96 29.13 29.35 28.95 29.55 29.94 33.06 29.64 29.55 29.65 23.76 27 28.95 29.14 29.36 28.97 29.58 29.96 30.05 29.64 29.56 29.66 23.77 28 28.96 29.15 29.36 28.99 27.60 29.98 30.04 29.65 29.57 29.66 28.79 29 28.97 29.16 29.37 29.01 27.61 30.00 30.03 29.67 29.57 29.66 23.31 30 28.98 29.17 29.39 --- 27.62 30.02 30.02 29.69 29.57 27.65 23.32 31 28.97 29.13 29.40 29.64 --- 30.01 --- 29.59 29.66 --- LOW 29.07 29.40 29.45 27.64 30.02 30.15 30.03 29.74 29.66 29.74 HIGH 29.95 20.18 28.39 29.03 29.65 30.01 29.64 29.55 29.54 23.76 20 3 22 0 -J LkJ 03 F- 1- < 24 Lao z< - 26 -J Jo 28 La< 3 30 32 ASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 1981 1982 1983 1984 306 GROUND-WATER LEVELS RIO CIBUCO BASIN 182705066213500. Local number, 151. LOCATION.--Lat 18°27'05", long 66°21'35". Owner: AFDA - P.R. Department of Agriculture. Name: Rice Program #3. AQUIFER.--AymamEin Limestone. WELL CHARACTERISTICS.--Drilled agricultural water-table well, diameter 18 in (0.46 m) cased 0-80 ft (0-24.39 m), diameter 16 in (0.41 m), open hole 80-160 ft (24.39-48.78 m). Depth 160 ft (48.78). DATUM.--Altitude of land-surface datum is about 19.7 ft (6 m) above mean sea level; Measuring point: Hole 1 in (0.02 m) 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 current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level, 3.72 ft (1.13 m) below land-surface datum, Jan. 13, 1982; lowest water level, measured, a41.78 ft (a12.74 m) below land-surface datum, Aug. 17, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 20 6.30 Jan. 23 6.80 June 12 7.03 Aug. 3 6.88 Nov. 18 6.32 Feb. 24 6.68 July 9 6.96 Sept. 5 6.62 Dec. 15 6.48 May 4 7.39 182612066225400. Local number, 155. LOCATION.--Lat 18°26'54", long 66°22'54". Owner: P.R. Aqueduct and Sewer Authority. Name: La Trocha. AQUIFER.--Aymam6n Limestone. WELL CHARACTERISTICS:--Drilled unused water-table well, diameter 20 in (0.51 m), cased 0-70 ft (0-21.34 m), diameter 16 in (0.41 m), cased 0-100 ft (0-30.49), perforated 100-200 ft (30.49-60.97 m). Depth 200 ft (61.0 m). DATUM.--Altitude of land-surface datum is about 49.20 ft (15.0 m) above mean sea level. Measuring Point: Top of 20 in (0.51 m) casing, 2.10 ft (0.64 m) 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 current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level, 32.23 ft (9.83 m) below land-surface datum, Jan. 14, 1982; lowest water level, 34.62 ft (10.55 m) below land-surface datum, May 29, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 7 34.10 Jan. 23 34.40 Apr. 17 34.60 July 18 34.51 Nov. 23 34.02 May 21 33.26 May 12 33.95 Aug. 15 34.32 Mar. 17 34.38 June 16 33.48 June 27 34.08 Sept. 6 34.60 182652066241400. Local number, 156. LOCATION.--Lat 18°26'52", long 66°24'14". Owner: P.R. Aqueduct and Sewer Authority. Name: El Criollo #1. AQUIFER.--AymamOn Limestone. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 20 in (0.51 m), cased 0-98 ft (0-29.88 m), diameter 16 in (0.41 m), perforated 88-120 ft (26.83-36.58 m). Depth 120 ft (36.58 m). DATUM.--Altitude of land-surface datum is about 49.20 ft (15 m) above mean sea level. Measuring point: Upper edge of 2 in (0.05 m) pipe on pump base, 1.80 ft (0.55 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--January 14, 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level, 40.52 ft (12.35 m) below land-surface datum, Feb. 16, 1982; lowest water level a47.30 ft (a14.42 m) below land-surface datum, Apr. 5, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 7 a42.95 Jan. 23 a41.89 Apr. 17 a42.89 July 18 a43.95 Nov. 23 a43.95 Feb. 21 a43.67 May 29 a43.00 Aug. 8 a43.75 Dec. 15 a43.94 Mar. 23 a44.02 June 11 a43.88 Sept. 5 a43.65 a Pumping. 307 GROUND-WATER LEVELS RIO CIBUCO BASIN 182654066211600. Local number, 167. LOCATION.--Lat 18°26'54", long 66°21'16". Owner: P. R. Land Authority, AFDA. Name: U.S.G.S. Observation Well #3. AQUIFER.--Aymamein Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m) 0-228 ft (0-69.51 m), open hole 228-238 ft (69.51-72.56 m). Depth 238 ft (72.56 m). DATUM.--Altitude of land-surface datum is 65.6 ft (20.0 m) above mean sea level. Measuring point: Top of 6 in (0.15 m) casing, 3.10 ft (0.94 m) above land-surface datum. REMARKS.--Observation well. Water levels affected by nearby pumpage. PERIOD OF RECORD.--January 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 13.07 ft (3.98 m) below land-surface datum, Jan. 13, 1982; lowest water level measured, c16.90 ft (5.15 m) below land-surface datum, Aug. 18, 1983. WATER LEVELS IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 14 15.13 Jan. 23 14.42 June 12 15.52 Aug. 3 15.54 Nov. 10 14.95 Feb. 24 15.19 July 9 15.60 Sept. 5 15.96 Dec. 15 15.14 May 4 15.92 182751066221600. Local number, 168. LOCATION.--Lat 18°27'51", long 66°22'16". 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 m) 0-156 ft (0-32.3 m), slotted 56-106 ft (17.07-32.31 m), open hole 106-150 ft (32.31-45.73 m). Depth 150 ft (45.73 m). DATUM.--Altitude of land-surface datum is about 9.84 ft (3 m) above mean sea level. Measuring point: Top of 16 in (0.41 m) casing, 0.80 ft (0.24 m) above land-surface datum. REMARKS.--Observation well. Irrigation water supply well. PERIOD OF RECORD.--March 17, 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 4.88 ft (1.49 m) below land-surface datum, Mar. 17, 1982; lowest water level measured, a53.85 ft (16.42 m) below land-surface datum, July 26, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 14 a49.90 Jan. 23 5.90 June 12 5.77 Aug. 3 a42.65 Nov. 17 a46.77 Feb. 24 a43.22 July 9 5.76 Sept. 5 a24.17 Dec. 15 a43.90 May 4 6.15 182740066223100. Local number, 169. LOCATION.--Lat 18°27'40", long 66°22'31". Owner: AFDA. P.R. Department of Agriculture. Name: Rice Program #5. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled agricultural water-table well, diameter 16 in (0.41 m), cased 16 in (0.41 m) 0-80 ft (0-24.39 m), open hole 80-140 ft (24.39-42.68 m). Depth 140 ft (42.68 m). Datum.--Altitude of land-surface datum is about 13.10 ft (4.0 m) above mean sea level. Measuring point: Top of 16 in (0.41 m) casing, 0.10 ft (0.03 m) above land-surface datum. REMARKS.--Observation well. Irrigation water supply well. PERIOD OF RECORD.--March 17, 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 6.15 ft (1.88 m) below land-surface datum, Mar. 17, 1982; lowest water level measured, a15.60 ft (4.76 m) below land-surface datum, July 26, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 14 6.33 Jan. 23 al2.10 June 12 6.35 Aug. 3 7.37 Nov. 17 al1.37 Feb. 24 al0.87 July 9 7.44 Sept. 5 7.62 Dec. 15 al1.10 May 4 al2.05 a Pumping. c Pumping nearby well 308 GROUND-WATER LEVELS RIO DE LA PLATA BASIN 180707066084201. Local number, 33. LOCATION.--Lat 18°07'07", long 66°08'42". Owner: P.R. Aqueduct and Sewer Authority. Name. Cayey 10. AQUIFER.--Volcanic rocks of Cretaceous Age. WELL CHARACTERISTICS.--Drilled public supply artesian well, diameter 16 to 12 in (41 to 30 cm), cased 16 in (41 cm) 0-30 ft (0-9.14 m), 12 in (30 cm) 0-200 ft (0-60.97 m), perforated 30-200 ft (9.14-60.97 m), gravel packed 0-190 ft (0-57.92 m). Depth 220 ft (67.07 m). DATUM.--Altitude of land-surface datum is about 1,280 ft (390 m) above mean sea level. Measuring point: Lower edge of 0.75 in (1.90 cm) pipe in pump base, 1.20 ft (0.37 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1959 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 1.49 ft (0.45 m) below land-surface datum, Jan. 18, 1961; lowest 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 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water WATER Water Date level Date level Date level Date level Oct. 13 al00.4 Jan. 24 a85.49 Apr. 10 a58.50 July 16 a79.50 Nov. 18 a 90.30 Feb. 24 a75.90 May 22 a67.97 Aug. 7 a70.75 Dec. 12 al02.1 Mar. 30 a112.0 June 19 a75.65 Sept. 11 a86.26 180853066095401. Local number, 37. LOCATION.--Lat 18°08'53", long 66°09'54". Owner: P.R. Aqueduct and Sewer Authority. Name: Barrio Rinc6n de Cidra. AQUIFER.--Volcanic rocks of Cretaceous Age. WELL CHARACTERISTICS.--Drilled water supply water-table well, diameter 16 to 8 in (41 to 20 cm), cased 16 in (41 cm) 0-30 ft (0-9.15 m), 12 in (30 cm) 0-43 ft (0-13.10 m), perforated 0-43 ft (0-13.10 m). Depth 200 ft (60.97 m). DATUM.--Altitude of land-surface datum is about 1,180 ft (359.7 m) above mean sea level. Measuring point: Lower edge at 0.75 in (1.90 cm) pipe, 1.90 ft (0.58 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--June 1960 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 14.38 ft (4.38 m) below land-surface datum, July 20, 1979; lowest measured, 62.87 ft (19.16 m) below land-surface datum, Jul. 5, 1961. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 13 22.25 Jan. 24 23.94 Apr. 11 25.34 July 16 24.00 Nov. 18 22.26 Feb. 24 23.27 May 22 25.47 Aug. 7 24.40 Dec. 12 23.00 Mar. 30 25.02 June 19 24.50 Sept. 11 24.98 180823066154601. Local number, 38. LOCATION.--Lat 18°08'23", long 66°15'46". Owner: P.R. Aqueduct and Sewer Authority. Name: Barrio Robles. AQUIFER.--Volcanic rocks of Cretaceous Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 10 in (25 cm). Depth 82 ft (25.0 m). DATUM.--Altitude of land-surface datum is about 1,980 ft (603 m) above mean sea level. Measuring point: Top of clean-out door sill, 1.80 ft (0.55 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1959 to current year; changed to a partial site on Sept. 2, 1981. EXTREMES FOR PERIOD OF RECORD.--Highest water level, 3.60 ft (1.10 m) above land-surface datum, Sept. 6, 1960; lowest, 51.47 ft (15.69 m) below land-surface datum, Sept. 30, 1977. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 13 10.14 Jan. 24 10.30 Apr. 10 12.40 July 16 10.57 Nov. 18 9.12 Feb. 24 10.75 May 22 12.60 Aug. 7 11.12 Dec. 12 9.72 Mar. 30 11.82 June 19 11.12 Sept. 11 11.33 a Pumping. 309 GROUND-WATER LEVELS RIO DE LA PLATA BASIN 182518066144201. Local number, 67. LOCATION.--Lat 18°25'18", long 66°14'42". Owner: P.R. Aqueduct and Sewer Authority. Name: Campanilla. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 12 in (30 cm). Depth 300 ft (91.46 m). DATUM.--Altitude of land-surface datum is about 390 ft (119 m) above mean sea level. Measuring point: Lower edge of 0.75 in (1.90 cm) pipe, 1.00 ft (0.30 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--March 1959 to December 19, 1983 (discontinued). EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 27.91 ft (8.51 m) below land-surface datum, Dec. 16, 1981; lowest measured, 49.90 ft (15.21 m) below land-surface datum, June 6, 1967. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Date level Date level Oct. 31 34.31 Dec. 19 34.12 182636066164201. 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 (25 cm). Depth 200 ft (60.97 m). DATUM.--Altitude of land-surface datum is about 60 ft (18.3 m) above mean sea level. Measuring point: Airline hole in pump base, 1.10 ft (0.34 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--July 1958 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 41.21 ft (12.56 m) below land-surface datum, July 3, 1958; lowest measured, 58.89 ft (17.95 m) below land-surface datum, Oct. 26, 1977. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Date Water level Date Water level Date Water level Date Water level Oct. 7 Nov. 8 Dec. 15 a54.07 a53.98 a54.17 Jan. 31 Feb. 21 Mar. 23 a49.70 a53.30 a52.70 Apr. 17 May 29 June 12 a51.26 a45.15 a51.26 July 18 Aug. 8 Sept. 5 a54.26 a53.56 a54.15 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.--AymamOn Limestone. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 12 in. (0.30 m), cased 12 in. (0.30 m) 0-300 ft (0-91.46 m), open hole 300-400 ft (91.46-122 m). Depth 400 ft (122 m). DATUM.--Altitude of land-surface datum is 131.2 ft (40 m) above mean sea level. Measuring point: Bottom edge of 1 in. (2.54 cm) pipe on top of pump concrete base, 1.00 ft (0.30 m) above land-surface datum. REMARKS.--Irrigation supply observation well. PERIOD OF RECORD.--January 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, a183.8 ft (56.04 m) below land-surface datum, Nov. 8, 1983; lowest water level measured, a210.9 ft (64.29 m) below land-surface datum, Apr. 15, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEARS OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 7 a184.2 Jan. 31 184.6 Apr. 17 al93.3 July 18 184.7 Nov. 8 a183.8 Feb. 21 184.0 May 29 185.6 Aug. 8 195.4 Dec. 15 184.2 Mar. 23 184.6 June 12 185.1 Sept. 5 196.5 a Pumping. 310 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 181047066091701. Local number, 42. LOCATION.--Lat 18°10'47", long 66°09'17". Owner: P.R. Aqueduct and Sewer Authority. Name: Cidra 2. AQUIFER.--Volcanic rocks of Cretaceous Age. WELL CHARACTERISTICS.--Drilled public supply artesian well, diameter 13 in (33 cm), cased 0-64 ft (0-19.51 m), perforated 16-64 ft (4.88-19.51 m). Depth 92 ft (28.05 m). DATUM.--Altitude of land-surface datum is about 1,340 ft (408 m) above mean sea level. Measuring point: Airline hole in pump base, 1.40 ft (0.43 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1959 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 12.30 ft (3.75 m) below land-surface datum, Dec. 27, 1979; lowest measured 56.32 ft (17.17 m) below land-surface datum, Apr. 1, 1968. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 13 17.00 Jan. 24 20.34 Apr. 11 25.95 July 16 19.99 Nov. 18 17.93 Feb. 24 21.00 May 22 26.01 Aug. 7 19.15 Dec. 12 19.71 Mar. 30 24.52 June 19 26.13 Sept. 11 21.93 182506066030801. Local number, 65. LOCATION.--Lat 18°25'06", long 66°03'08". 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 15 in (38 cm), cased 0-205 ft (0-62.50 m), perforated 64-205 ft (19.51-62.50 m). Depth 205 ft (62.50 m). DATUM.--Altitude of land-surface datum is about 33 ft (10.1 m) above mean sea level. Measuring point: Top of casing 3.40 ft (1.04 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--July 1958 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 22.40 ft (6.83 m) below land-surface datum, Aug. 12, 1976; lowest measured, 42.40 ft (12.92 m), below land-surface datum, May 13, 1974. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 11 31.24 Feb. 17 30.33 Apr. 11 30.75 July 18 31.46 Nov. 17 31.05 Mar. 19 30.66 May 31 31.25 Aug. 8 31.48 Dec. 19 30.35 23 30.80 June 5 31.46 Sept. 11 31.30 Jan. 13 30.43 182547066110801. 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 m). DATUM.--Altitude of land-surface datum is about 75 ft (22.87 m) above mean sea level. Measuring point: Lower edge of 0.75 in (1.90 cm) pipe in pump base, 1.20 ft (0.37 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--June 1958 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, a39.23 ft (a11.96 m) below land-surface datum, Dec. 17, 1981; lowest measured, 57.75 ft (17.60 m), below land-surface datum, Aug. 13, 1976. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 7 a43.63 Feb. 21 a44.02 May 29 45.36 Aug. 8 44.87 Dec. 15 a44.30 Mar. 23 a44.55 June 12 45.14 Sept. 6 44.92 Jan. 31 a46.87 Apr. 17 44.96 July 18 44.77 a Pumping. 311 GROUND-WATER LEVELS RIO GRANDE DE LOIZA BASIN 181550065593201. Local number, 50. LOCATION.--Lat 18°15'50", long 65°59'32". Owner: Gurabo Agricultural Experimental Station. Name: Gurabo. AQUIFER.--Unconsolidated deposits of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 13 in (33 cm). Depth 145 ft (44.21 m). DATUM.--Altitude of land-surface datum is about 148 ft (45.12 m) above mean sea level. Measuring point: Top of 12 in (30 cm) casing, 0.80 ft (0.24 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--December 1960 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 12.65 ft (3.86 m) below land-surface datum, Sept. 9, 1975; lowest measured, 44.38 ft (13.53 m) below land-surface datum, June 18, 1975. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 13 29.83 Jan. 12 29.44 Apr. 10 31.34 July 30 26.96 Nov. 22 28.99 Feb. 16 28.86 May 29 34.33 Aug. 13 30.20 Dec. 19 29.55 Mar. 8 29.17 June 14 30.15 Sept. 17 30.45 181538066021301. 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 (41 to 25 cm) 0-69 ft (0-21.04 m), 79-100 ft (24.08-30.49 m), 110-116 ft (33.54-35.37 m), perforated 79-100 ft (24.08-30.49 m), screened 69-79 ft (21.04-24.08 m) and 100-110 ft (30.49-33.54 m); gravel packed to 113 ft (34.45 m). Depth 116 ft (35.37 m). DATUM.--Altitude of land-surface datum is about 200 ft (60.98 m) above mean sea level. Measuring point: Airline hole in pump base, 1.4 ft (0.43 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--July 1959 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, +0.92 ft (+0.28 m) below land-surface datum, Nov. 15, 1979; lowest measured, a115.1 ft (a35.09 m) below land-surface datum, June 18, 1975. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 13 a73.51 Jan. 13 a74.08 Apr. 10 a80.08 July 30 a73.12 Nov. 11 a73.76 Feb. 17 a75.53 May 29 a78.85 Aug. 13 a76.22 Dec. 12 a73.16 Mar. 8 a79.85 June 14 a73.01 Sept. 13 26.23 + Above land-surface datum. a Pumping. 312 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. WELL CHARACTERISTICS.--Test well drilled by the USGS, diameter 4 to 2 in (10.16-5.08 cm), cased 4 in (10.16 cm) 0-29 ft (0-8.84 m), 2 in (5.08 cm) 29-32 (8.84-9.76 m), 2 in (5.08 cm) slotted PVC screen 29-32 ft (8.84-9.76 m). Depth 32 ft (9.76 m). DATUM.--Altitude of land-surface datum is about 19.10 ft (5.82 m) above mean sea level. Measuring point: Mark on shelf of gage house, 6.00 ft (1.83 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--June 1983 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 2.72 ft (0.83 m) below land-surface datum, Nov. 6, 1983; lowest measured, 10.87 ft (3.31 m) below land-surface datum, May 17, 1984. WATER LEVEL, IN FEET 3FLCW LAND-SURFACE DATum, WATER INSTANTANEOUS 05SERVATIONS AT TZAR 1230 OCTOBER 1183 TO SEPTEMBER 1984 DAY OCT NOV JEC JAN .83 mAP APR MAY JUN JUL AUG SEP 1 2 3 4 5 5.51 8.81 3.94 8.14 9.01 3.'6 2.77 1.30 5.63 5.67 1.97 5.23 °.22 3.4) 9.50 3.99 9.00 7.37 2.92 3.72 3.91 3.10 1.03 1.07 1.11 9.93 9.9 - 9.92 10.01 10.03 10.52 10.62 10.56 12.68 13.71 9.75 9.93 10.09 10.20 10.30 .6.5 9 3.72 3.61 3.36 7.44 9.13 7.84 8.44 8.59 3.54 3.52 3.61 3.72 3.77 3.35 6 7 8 9 10 9.27 9.03 9.07 8.14 8.76 3.37 5.47 7.13 7.45 7.73 7.77 8.27 8.41 3.56 3.67 9.06 9.73 1.13 1.14 3.33 3.37 8.54 3.36 3.35 7.73 9.14 1.22 7.24 1.25 7.76 10.06 10.07 10.10 10.15 10.17 10.75 10.77 13.79 10.32 10.65 9.13 6.99 7.81 1.21 7.69 3.26 3.56 3.73 1.36 3.35 R.70 3.85 3.93 9.05 9.12 3.57 3.72 3.33 3.16 3.36 11 12 13 14 15 8.58 8.36 8.72 8.93 8.93 7.35 3.02 3.12 3.20 1.29 8.64 2.51 8.74 8.R4 8.86 3.99 3.17 3.76 4.49 3.57 7.31 P.29 3.03 8.06 7.45 4. 1 5 1.39 /.47 1.24 1.75 10.19 10.15 13.22 10.24 10.30 11.32 10.35 10.36 13.73 10.31 7.49 d.2) 7.97 8.74 8.56 9.02 9.07 7.18 9.21 9.11 9.25 9.31 9.34 9.42 9.44 2.91 7.91 3.25 6.43 7.34 16 17 18 19 20 8.75 8.94 8.74 8.15 8.05 3.40 3.45 5.53 3.46 8.60 °.50 2.35 5.64 3.30 1.02 6.78 7.63 7.93 8.13 F.30 1.45 1.28 1.34 9.49 7.55 10.33 10.37 10.39 10.41 10.43 13.36 10.34 10.79 13.71 13.40 9.71 3.53 8.7° 3.82 8.49 9.28 4.37 9.26 1.43 9.49 9.49 9.49 9.56 9.64 9.65 8.39 6.93 5.73 7.04 4.66 21 22 23 24 25 3.23 Q.43 8.52 8.63 8.75 8.60 9.68 9.74 8.76 3.69 1.48 3.59 3.22 3.56 1.11 8.39 8.51 8.55 3.67 8.70 7.62 1.64 1.64 1.55 9.70 10.45 10.45 10.53 10.54 10.56 10.59 10.77 10.69 10.50 10.72 3.70 8.91 9.07 9.11 9.19 9.53 7.43 9.34 9.50 9.52 9.70 9.65 9.68 9.75 9.84 6.14 7.07 7.46 7.81 7.97 26 27 28 29 30 31 8.70 8.85 8.90 8.95 8.70 8.00 3.14 3.92 3.96 3.99 3.97 --- 2.51 5.66 3.77 3.34 3.39 3.93 3.75 8.90 8.80 8.88 --- 1. 75 9.73 7.30 7.81 1.36 9.90 10.58 10.59 10.03 10.33 10.48 --- 3.92 10.33 5.15 9.84 7.91 9.18 9.32 9.35 9.45 9.34 8.44 --- 9.53 7.64 9.64 9.45 3.79 9.35 9.33 7.40 7.95 3.35 8.52 3.63 8.11 3.27 3.16 3.34 8.45 --- LOw HIGH 9.03 8.00 8.99 3.37 9.07 6.7! 3.90 3.90 10.59 9.93 10.96 7.91 10.30 6.97 9.64 7.44 9.84 7.40 8.91 4.66 313 GROUND-WATER LEVELS RIO HERRERA TO RIO ANTON RUIZ BASINS 180908065475000. Local number, 173. LOCATION.--Lat 18°09'08", long 65°47'50". Owner: Squibb Manufacturing, Inc. Name: Squibb observation well #3. AQUIFER.--Alluvium. WELLS CHARACTERISTICS.--Drilled unused water-table industrial well, diameter 10 in (0.25 m), cased 10 in (0.25 cm), perforated 60-110 ft (18.29-33.54 m). Depth 110 ft (33.54 m) DATUM.--Altitude of land-surface datum is about 21.00 ft (6.40 m) above mean sea level. Measuring point: Mark on shelf of gage house, 3.00 ft (0.91 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--July 1983 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 3.73 ft (1.14 m) below land-surface datum, Sept. 29, 1984; lowest measured, 10.44 ft (3.18 m) below land-surface datum, May 19-20, 1984. )48TER LEVEL, IN FEET 3EL01r LANG-suRFAcE 0ATum, 'WATER YEAR OCTOBER 1933 TO SEFTE41Ep 1984 INSTANTANEOUS 013SERvATicms AT 1200 Our OCT NOV DEC JAN FE1 mAR IPR MAY JUN JUL Au; SEP 1 6.89 6.67 7.84 5.78 4.33 3.28 9.91 10.07 9.53 7.79 6.36 2 6.91 5.66 7.77 5.76 4.44 3.55 9.15 10.11 9.43 7.32 6.36 3 7.01 6.64 7.70 5.53 4.35 3.44 7.67 10.13 9.45 7.35 6.36 4 7.00 6.53 7.66 5.59 4.26 3.51 9.87 10.15 9.44 7.91 6.32 5 7.02 5.46 7.65 5.55 3.31 3.60 9.95 10.17 9.44 7.78 6.34 6 7.05 6.44 7.65 5.70 2.63 3.67 9.93 10.13 9.06 7.69 6.74 7 7.07 6.52 7.65 5.32 2.24 3.77 10.0' 10.19 8.34 7.67 6.67 8 7.07 6.60 7.45 5.87 2.64 3.35 10.16 10.19 5.76 7.71 6.61 9 7.07 6.61 7.25 5.94 3.63 3.39 10.24 10.20 6.76 7.74 5.56 10 7.07 6.58 7.21 5.90 3.92 3.99 10.21 10.23 5.64 7.72 6.49 11 7.07 6.70 7.13 5.90 4.72 1.04 10.14 10.25 8.54 7.78 6.34 12 7.06 6.86 7.03 5.94 5.39 9.10 10.13 10.26 8.41 7.77 6.43 13 7.06 6.96 7.32 5.97 5.79 1.15 10.14 10.22 8.23 7.76 6.07 14 7.03 7.01 7.55 5.14 6.21 1.18 10.16 10.24 8.21 7.78 5.78 15 7.02 7.09 7.71 5.98 4.47 1.24 10.17 10.25 1.19 7.81 5.78 16 17 18 6.19 6.87 6.35 7.11 7.12 7.18 7.81 7.80 7.47 5.98 5.71 5.91 6.64 6.34 6.92 4.30 9.34 1.36 10.10 10.20 10.23 10.27 10.33 10.33 8.19 8.21 8.12 7.35 7.93 7.97 5.79 5.29 5.26 19 6.84 7.23 7.53 5.94 7.07 4.22 10.26 10.39 7.95 3.02 4.38 20 6.14 7.27 7.12 5.33 7.13 9.28 10.23 10.42 7.35 3.03 4.57 21 6.85 7.33 6.34 5.56 7.33 7.40 10.29 10.27 7.82 3.07 4.31 22 23 24 25 6.85 6.86 6.86 6.84 7.38 7.45 7.53 7.60 6.66 6.56 6.39 6.29 5.39 5.17 5.04 5.00 7.43 7.64 7.74 7.89 7.45 9.48 9.52 9.55 10.24 10.13 10.16 10.11 10.13 13.11 10.10 10.06 7.80 7.81 7.83 7.79 7.35 7.75 --- 4.19 4.08 4.00 3.90 26 27 28 29 30 31 6.82 6.82 6.76 6.76 6.76 6.67 7.65 7.68 7.71 7.78 7.82 --- 6.20 6.11 6.04 5.97 5.33 5.82 4.32 4.74 4.67 4.62 4.38 4.39 8.03 8.08 8.16 8.23 --- 4.58 9.52 9.65 9.68 9.72 3.78 10.08 10.09 10.10 10.12 10.14 --- 10.35 10.06 10.06 10.04 9.85 9.67 7.45 7.47 7.61 7.72 7.74 --- 7.05 7.00 6.94 6.87 3.35 3.32 3.76 3.74 3.76 LOW HIGH 7.07 6.67 7.82 6.44 7.84 5.82 5.98 4.38 8.23 2.29 7.78 3.28 10.29 9.81 10.42 9.67 9.53 7.45 6.36 3.74 314 GROUND-WATER LEVELS RIO HUMACAO TO RIO SECO BASINS 175735066095901. Local number, 2. LOCATION.--Lat 17°57'35", long 66°09'59". 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 (53 cm). Depth 148 ft (45.12 m). DATUM.--Altitude of land-surface datum is about 26 ft (7.93 m) above mean sea level. Measuring point: Bottom edge of 0.88 in (2.24 cm) pipe, 1.70 ft (0.52 m) above land-surface datum. REMARKS.--Observation well. Lowest water level is a pumping level. PERIOD OF RECORD.--February 1961 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 2.85 ft (0.87 m) below land-surface datum, July 24, 1979; lowest measured, 61.78 ft (18.83 m) below land-surface datum, Aug. 6, 1964. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 6 7.25 Jan. 13 7.04 Apr. 6 6.91 July 9 6.51 Nov. 22 6.94 Feb. 17 6.49 May 5 7.20 Aug. 6 7.15 Dec. 9 7.20 Mar. 23 6.75 June 12 5.87 Sept. 26 6.10 175734066100401. Local number, 3. LOCATION.--Lat 17°57'34", 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 (10 cm). Depth 16 ft (4.88 m). DATUM.--Altitude of land-surface datum is about 25 ft (7.62 m) above mean sea level. Measuring point: Top of 5 in (13 cm) fitting, 0.50 ft (0.15 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--November 1959 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 0.01 ft (0.30 m) below land-surface datum, Jan. 3, 1963; lowest measured, dry at 16 ft (4.88 m) below land-surface datum, many days during 1968 and 1969. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 6 2.90 Jan. 13 2.59 Apr. 6 2.55 July 9 2.08 Nov. 22 2.58 Feb. 17 1.81 May 3 2.94 Aug. 6 2.86 Dec. 9 2.85 Mar. 23 2.21 June 12 0.83 Sept. 26 1.62 315 GROUND-WATER LEVELS RIO HUMACAO TO RIO SECO BASINS 175858066100201. 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 (41 cm). Depth 173 ft (52.74 m) reported, 110 ft (33.54 m) measured. DATUM.--Altitude of land-surface datum is about 127 ft (38.72 m) above mean sea level. Measuring point: Top of shelter floor, 3.00 ft (0.91 m) above land-surface datum. After Aug. 7, 1981, top of 16" casing, 1.55 ft (0.47 m) above land-surface datum. REMARKS.--Recorder installed 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 m) below land-surface datum, Dec. 10, 1979; lowest measured, 65.95 ft (20.10 m) below land-surface datum, June 2, 1968. WATER LEV1L, IN FEET 3FL0W LAND-SURFACE DATUM, WATER YEAR CCTO8ER 1983 TO SEPTEMBER 1984 INSTANTANEOUS 03SERVATIONS AT 1200 DAY OCT NOV DEC JAN FE3 MAR APR MAY JUN JUL AUG SEP 1 55.25 43.26 44.74 43.49 46.41 53.24 52.23 50.47 50.67 52..1 54.33 54.15 2 55.17 47.55 44.39 41.49 46.35 53.50 52.21 50.71 50.70 52.57 54.36 54.31 3 55.11 46.34 44.17 43.53 46.32 53.75 52.21 50.31 50.75 52.71 54.39 54.45 4 55.04 45.35 43.3' 47.58 46.31 53.97 51.97 50.55 50.81 52.52 54.43 54.55 5 54.77 45.70 43.94 43.50 46.36 51.18 51.14 50.33 50.81 52.48 54.47 54.54 6 54.93 46.12 44.42 43.53 46.45 51.40 53.55 59.23 50.80 52.7,0 54.50 54.73 7 54.85 46.78 44.82 43.52 46.69 51.54 49.92 50.13 50.86 52.92 54.52 54.81 8 54.81 47.48 44.97 43.50 46.77 51.33 43.80 49.97 50.93 52.95 54.53 54.97 9 10 54.79 54.77 46.05 45.27 44.72 44.67 4'.58 43,36 46.66 46.52 5).94 53.43 43.40 49.12 49.72 49.74 50.90 50.90 52.99 53.04 54.54 54.55 54.90 54.39 11 54.76 44.86 44.83 44.28 46.33 53.33 49.55 49.51 50.89 53.10 54.55 54.32 12 54.74 44.'8 44.93 44.36 46.25 53.58 49.23 49.70 50.91 53.18 54.55 54.72 13 54.70 44.99 45.11 44.33 46.12 53.91 49.28 49.99 50.93 53.25 54.52 54.59 14 54.63 45.14 45.06 44.30 46.17 51.26 49.73 50.25 50.98 53.33 54.47 54.51 15 54.65 45.57 45.19 44.36 46.67 51.51 49.85 50.26 51.04 53.41 54.48 54.53 16 53.73 45.32 45.18 44.53 46.75 51.71 49.90 50.24 51.09 53.48 54.48 54.63 17 52.14 46.41 44.68 44.67 46.32 51.35 49.85 50.16 51.13 53.57 54.45 54.76 18 50.93 46.41 44.04 44.51 46.77 51.16 50.00 50.02 51.17 53.65 54.37 54.33 19 50.23 46.41 43.63 44.54 46.71 52.14 50.08 49.90 51.23 53.72 54.27 54.97 20 49.23 46.37 43.81 44.60 46.63 52.12 49.82 49.86 51.33 53.30 54.10 55.05 21 49.07 45.33 44.31 44.59 46.77 52.20 49.37 49.83 51.33 53.36 53.91 55.08 22 48.95 44.83 44.51 44.73 47.01 52.25 48.93 50.02 51.47 53.90 53.77 55.04 23 48.16 45.11 44.10 44.33 47.51 52.23 48.84 50.13 51.62 53.95 53.66 54.93 24 47.93 45.23 44.14 45.47 48.05 52.09 49.31 53.32 51.69 54.01 53.59 54.30 25 48.59 45.67 43.90 46.36 43.60 52.16 49.24 50.55 51.71 54.07 53.52 54.68 26 48.03 46.13 43.35 45.17 49.09 52.26 48.93 50.63 51.73 54.16 53.43 54.59 27 47.79 46.06 44.11 45.96 49.43 52.34 48.39 50.55 51.80 54.25 53.49 54.53 28 48.76 45.70 43.84 45.96 49.32 52.43 49.34 50.56 51.94 54.29 53.54 54.52 29 43.51 45.73 43.59 45.76 50.01 52.49 49.81 59.68 52.10 54.28 53.66 54.50 30 48.53 45.40 43.72 45.97 --- 52.45 30.17 50.63 52.25 54.30 53.81 54.49 31 48.60 --- 43.56 46.35 52.37 --- 50.69 --- 54.30 53.98 --- LOW 55.25 43.26 45.19 45.35 50.01 52.49 52.28 50.71 52.25 54.30 54.55 55.03 HIGH 47.79 44.78 43.56 43.49 46.12 50.24 48.40 49.61 50.67 52.41 53.45 54.15 WTR YR 1934 MEAN 49.68 LOW 55.25 HIGH 43.48 40 3 LaD 45 CD 41 4.1 4- (-)< L- 50 LI W-ICI Z < 55 3 ASONDJFMAMJJASQNDJFMAMJJASONDJFMAMJJAS 1981 1982 1983 1984 60 316 GROUND-WATER LEVELS RIO HUMACAO TO RIO SECO BASINS 175944066033601. 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 (30 cm). Depth 181 ft (55.18 m). DATUM.--Altitude of land-surface datum is about 130 ft (39.63 m) above mean sea level. 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 current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level, 3.00 ft (0.91 m) below land-surface datum, Oct. 7, 1970; lowest, 43.90 ft (13.38 m) below land-surface datum, May 20, 1968. WATER LEVFL, IN FEET ?ELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV -DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 10.75 14.56 14.46 13.31 15.26 20.24 23.44 19.27 16.99 22.12 27.45 2 10.79 15.04 14.54 13.55 15.19 20.03 22.45 19.07 16.68 22.01 25.54 3 11.06 15.21 13.63 18.75. 17.20 19.73 23.67 18.15 13.04 22.17 27.16 4 5 11.35 11.60 13.35 9.32 13.71 14.01 19.19 19.04 /7.38 13.24 19.5.1 19.83 24.36 24.73 17.21 16.29 18.69 18.11 22.31 22.37 27.45 27.45 6 11.33 3.93 14.55 12.52 13.77 20.15 24.38 15.46 10.37 22.24 25.35 7 11.9? 8.72 15.01 19.03 14.19 20.46 24.44 14.62 9.46 22.17 27.44 s 12.15 3.94 15.33 17.55 14.55 20.47 24.40 13.90 9.61 21.81 27.44 9 11.95 9.24 15.63 17.75 14.44 20.32 24.51 12.97 10.07 21.61 27.44 10 11.44 4.55 16.09 13.00 20.02 20.24 24.50 12.13 10.53 21.33 27.44 11 12 13 14 11.61 11.93 12.1 7 12.36 4.37 13.16 13.44 10.70 16.52 13.45 18.62 18.20 13.33 2).04 2).36 2).17 27.38 20.33 20.66 20.73 21.09 24.92 25.06 25.30 25.11 11.30 10.48 9.65 8.82 10.37 11.26 11.63 12.10 20.79 20.24 20.22 20.33 27.24 27.29 27.19 27.00 15 12.56 10.97 12.57 23.09 21.16 25.18 9.03 12.50 20.61 27.22 16 12.29 11.22 10.45 20.10 21.34 25.14 9.38 13.11 20.97 26.01 17 12.30 11.42 9.32 20.11 20.9? 25.18 9.69 13.61 21.04 20.72 13 12.55 11.55 9.34 23.13 21.18 25.18 9.96 14.42 24.86 10.57 19 20 12.43 12.24 11.75 11.97 13.39 9.65 10.04 2).14 23.15 21.27 21.23 25.18 25.18 10.12 10.47 15.39 17.55 25.42 25.60 8.75 8.39 21 22 12.43 12.51 12.19 12.39 14.)9 14.70 10.42 10.34 2).15 23.43 21.61 21.59 25.18 25.17 10.85 11.19 18.32 13.33 26.35 26.40 7.25 7.63 23 24 12.62 12.93 12.62 12.35 15.39 15.35 11.25 11.65 2).53 20.72 21.37 21.61 25.05 25.12 11.49 11.86 19.38 19.80 26.73 26.97 7.88 3.06 25 13.07 13.13 16.74 12.10 23.43 21.81 25.18 12.29 23.31 26.95 2.19 26 27 28 13.23 13.15 13.41 13.31 13.49 13.67 17.24 1 7.57 1 7.96 12.53 12.97 13.49 2).12 2).12 20.11 21.75 21.80 22.17 25.18 25.18 25.13 12.32 13.40 13.80 23.28 21.37 21.35 27.45 26.70 27.13 3.32 3.48 8.65 29 13.73 13.85 1?.05 13.97 14.96 22.35 25.17 14.36 21.83 27.22 8.32 30 13.94 14.10 18.02 --- 19.33 22.03 24.58 15.64 21.83 27.31 3.92 31 14.09 --- 13.32 23.20 --- 20.76 --- 21.97 26.53 --- LOW 14.04 15.21 19.19 23.72 22.35 25.18 19.27 21.97 27.45 27.45 HIGH 10.75 3.72 9.32 15.26 19.73 20.76 8.82 9.46 20.22 7.25 • 10 -J LJ 0 co o­w 1L -0 wo 15 Z.ct _J D > 20 41 -J 1=1 IX 7 41 --1 • 25 30 ASONDJFMAMJ JASONDJFMAMJJASONDJFMAMJJAS 1981 1982 1983 1984 317 GROUND-WATER LEVELS RIO HUMACAO TO RIO SECO BASINS 180338065523301. Local number, 31. LOCATION.--Lat 18°03'38", long 65°52'33". 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 (51 cm), 0-120 ft (0-36.58 cm), 12 in (30 cm) 120-125 ft (36.58-38.11 m), cased 0-125 ft (0-38.11 m), perforated 40-125 ft (12.20-38.11 m). Depth 125 ft (38.11 m). DATUM.--Altitude of land-surface datum is about 41 ft (12.50 m) above mean sea level. Measuring point: Airline hole in pump base, 4.00 ft (1.22 m) above land-surface datum. REMARKS.--Observation well. Drilled 5 ft (1.52 m) into rock. Affected by nearby pumping. PERIOD OF RECORD.--July 1959 to August 1973; April 1975 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 5.86 ft (1.79 m) below land-surface datum, Sept. 20, 1960; lowest measured, a50.57 ft (a15.41 m) below land-surface datum, July 7, 1977. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 6 a34.98 Jan. 17 a34.81 Apr. 12 a36.97 July 18 a27.10 Nov. 22 a33.77 Feb. 15 a34.91 May 21 a35.93 Aug. 16 a40.25 Dec. 13 a33.91 Mar. 12 a38.54 June 14 a32.84 Sept. 26 a40.60 175641066085101. Local number, 89. LOCATION.--Lat 17°56'41", 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 (10 cm). Depth 114 ft (34.75 m). DATUM.--Altitude of land-surface datum is about 6 ft (1.8 m) above mean sea level. Measuring point: Top of casing, 2.25 ft (0.69 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--October 1968 to current year; changed to a partial site on Oct. 1, 1981. EXTREMES FOR PERIOD OF RECORD.--Highest water level, +2.70 ft (+0.82 m) above land-surface datum, Jan. 9, 1973; lowest, 4.32 ft (1.32 m) below land-surface datum, June 5, 1981. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 6 0.98 Jan. 13 0.79 Apr. 6 1.22 July 9 +0.41 Nov. 22 0.50 Feb. 17 0.95 May 3 1.45 Aug. 6 1.60 Dec. 9 0.82 Mar. 23 1.34 June 14 1.13 Sept. 26 0.64 + Above land-surface datum. a Pumping. 318 GROUND-WATER LEVELS RIO HUMACAO TO RIO SECO BASINS 180416065514101. Local number, 96. LOCATION.--Lat 18°04'16", long 65°51'41". 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 (41 cm) cased 0-10 ft (0-3.05 m), diameter 6 in (15 cm), cased about 0-183 ft (0-55.79 m), perforated 56-81 ft (17.07-24.70 m), 102-123 ft (31.10-37.50 m), 144-181 ft (43.90-55.18 m). Depth 181 ft (55.18 m). DATUM.--Altitude of land-surface datum is about 25 ft (7.62 m) above mean sea level. Measuring point: Top of shelter floor, 4.00 ft (1.22 m) above land-surface. REMARKS.--Observation recording well. PERIOD OF RECORD.--April 25, 1978 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level, 15.52 ft (4.73 m) below land-surface datum, Jan. 15, 1982; lowest, 28.29 ft (8.62 m) below land-surface datum, Sept. 20, 1980. WATER LEVEL, IN =ET 1EL0W LAND-SURFACE OATuM, HATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS AT 1210 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 19.07 19.53 18.61 19.62 22.54 23.17 22.60 23.19 21.96 21.27 21.57 22.31 2 18.80 18.61 18.12 13.41 22.51 23.56 22.47 23.38 21.92 21.28 21.73 22.44 3 18.51 19.27 18.31 13.25 22.77 21.44 22.11 23.48 21.87 21.A7 21.32 22.63 4 18.73 19.75 17.96 13.44 23.02 21.30 22.37 23.66 21.73 21.45 21.93 22.32 5 18.95 20.08 17.63 13.55 23.13 21.95 22.56 23.59 21.65 21.31 21.94 22.95 6 19.58 19.98 11.16 23.23 21.91 22.71 23.55 21.65 21.29 21.95 22.92 7 19.80 19.94 1A.94 23.47 22.20 22.85 23.34 21.40 21.27 21.98 22.96 8 19.89 23.10 13.99 23.59 22.28 22.89 22.79 21.33 21.16 22.04 23.09 9 19.70 20.24 13.93 23.45 22.22 22.90 22.50 21.20 23.84 22.01 23.16 10 19.04 20.22 13.35 23.36 22.30 22.97 22.60 20.95 20.70 21.93 23.04 11 18.92 19.99 11.73 23.25 21.96 22.96 22.57 20.76 20.20 21.87 22.92 12 18.96 19.91 13.31 23.05 20.55 22.86 22.33 20.63 19.99 . 21.80 22.86 13 19.05 20.38 --- 13.93 22.32 23.66 22.73 22.42 20.50 20.66 21.53 22.86 14 19.29 20.15 17.98 11.78 22.77 21.28 22.93 22.56 20.43 20.55 21.41 22.98 15 19,57 19.88 18.34 13.66 20.14 23.75 23.09 22.91 20.42 20.15 21.52 23.05 16 19.29 19.20 18.23 13.55 20.71 21.50 23.19 23.26 20.51 19.99 21.53 23.99 17 19.17 13.79 18.12 13.60 20.92 21.73 23.37 23.41 20.66 19.95 21.42 22.91 18 19.33 13.94 17.93 21.74 20.72 21.77 23.44 23.45 20.72 20.03 21.43 22.64 19 19.60 18.80 17.94 21.09 20.53 22.05 23.61 23.50 20.81 20.16 21.64 22.43 20 19.59 13.68 18.17 21.46 20.33 22.33 23.69 23.56 20.74 20.09 21.77 22.20 21 19.79 13.64 18.60 21.67 20.32 22.54 23.43 23.60 20.77 20.19 21.90 21.16 22 20.09 13.63 18.78 21.59 20.23 22.73 23.17 23.67 20.79 20.05 22.06 21.69 23 20.13 13.73 18.66 21.62 20.21 22.68 22.91 23.53 20.75 19.95 22.21 21.46 24 20.01 11.71 18.79 21.95 20.58 22.66 22.93 23.39 20.73 20.05 22.34 21.18 25 20.22 19.64 18.91 22.15 20.81 22.62 23.12 23.15 20.63 20.26 22.44 20.99 26 20.33 13.62 18.05 22.37 20.75 22.53 23.31 22.96 20.56 20.38 22.45 20.90 27 20.33 18.45 19.13 22.59 20.50 22.56 23.44 22.74 20.59 20.57 22.48 20.13 28 20.02 18.6 7 19.26 22.49 19.53 22.64 23.52 22.58 20.83 20.34 22.56 20.73 29 20.72 13.90 19.22 22.18 19.30 22.63 23.15 22.48 21.10 21.06 22.50 20.68 30 21.13 18.82 19.07 21.95 --- 22.67 23.02 22.25 21.23 21.11 22.41 20.79 31 20.25 --- 18.87 22.06 22.73 --- 22.11 --- 21.29 22.33 --- LOW 21.13 20.24 22.59 23.58 22.73 23.69 23.67 21.96 21.45 22.56 23.16 HIGH 18.61 18.45 13.25 19.30 23.17 22.11 22.11 20.42 19.95 21.41 20.68 14 0 La n 17 m F 1- 4 Lac La w LL. L) Z.< 20 W v I) Ld < 23 aJ 26 ONDJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 1981 1982 1983 1984 319 GROUND-WATER LEVELS RIO HUMACAO TO RIO SECO BASINS 180026065544301. Local number, 122. LOCATION.--Lat 18°00'26", long 65°54'43". Owner: P.R. Aqueduct and Sewer Authority. Name: Maunabo Calzada. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled exploration well, diameter 4 in (10 cm). Depth 70 ft (21.3 m). DATUM.--Altitude of land-surface datum is about 28.5 ft (8.7 m) above mean sea level. Measuring point: Top of shelter floor, 1.4 ft (0.43 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--December 1971 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 2.24 ft (0.68 m) below land-surface datum, July 8, 1976; lowest measured, 12.38 ft (3.77 m) below-land surface datum, Aug. 12, 1977. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 6 c 8.90 Jan. 17 c 9.14 Apr. 12 c10.60 July 18 c10.45 Nov. 22 c 8.78 Feb. 15 c10.10 May 21 c11.33 Aug. 16 c10.79 Dec. 13 c 9.42 Mar. 12 c10.00 June 14 c 8.13 Sept. 26 7.83 180010066004501. Local number, 125. LOCATION.--Lat 18°00'10", long 66°00'45". 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 (41 cm), cased 0-45 ft (0-13.7 m); cased 12 in (30 cm) 0-49 ft (0-14.9 m); perforated 49-81 ft (14.9 -24.7 m). Depth 90 ft (27.4 m). DATUM.--Altitude of land-surface datum is about 48 ft (14.6 m) above mean sea level. Measuring point: Bottom edge of 0.75 in (1.90 cm) pipe in concrete pump base 1.0 ft (0.30 m) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping nearby well. PERIOD OF RECORD.--January 1976 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 12.83 ft (3.91 m) below land-surface datum, June 17, 1981; lowest measured, a52.98 ft (a16.15 m) below land-surface datum, May 24, 1979. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 6 a48.83 Jan. 20 a48.90 Apr. 11 a48.16 July 10 a51.33 Nov. 22 a48.87 Feb. 15 a48.76 May 14 a52.10 Aug. 6 a48.72 Dec. 5 a50.10 Mar. 21 a48.90 June 14 a50.63 Sept. 17 20.58 a Pumping. c Pumping nearby well 320 GROUND-WATER LEVELS RIO HUMACAO TO RIO SECO BASIN 180849065502400. Local number, 172. LOCATION.--Lat 18°08'49", long 65°50'24". 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 to 2 in (10.16-5.08 cm), cased 4 in (10.16 cm) 0-40 ft (0-12.20 m), 2 in (5.08 cm) 40-43 ft (12.20-13.11 m), 2 in (5.08 slotted PVC screen 40-43 ft (12.20-13.11 m), 2 in (5.08) slotted PVC screen 40-43 ft (12.20-13.11 m). Depth 43 ft (13.11 m). DATUM.--Altitude of land-surface datum is about 57.40 ft (17.50 m) above mean sea level. Measuring point: Mark on shelf of gage house, 3.30 ft (1.01 m) above land surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--November 1983 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 15.73 ft (4.80 m) below land-surface datum, Sept. 14, 1984; lowest measured 18.22 ft (5.55 m) below land-surface datum, May 9-11, 1984. WATER LEVEL. IN FEET !FLOW LAND-SURFACE DATUM. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FES MAR APR MAY JUN JUL AUG SEP 1 2 3 17.71 17.53 17.40 17.61 17.56 17.70 17.79 17.80 17.81 17.78 17.77 17.78 18.05 18.06 18.07 13.18 18.19 18.20 17.42 17.50 17.60 17.17 17.13 17.21 17.17 16.95 17.12 17.15 17.21 17.24 4 17.45 17.71 17.81 17.80 18.09 18.15 17.62 17.24 16.77 17.18 5 17.52 17.71 17.82 17.80 18.07 18.15 17.70 16.93 16.99 17.23 6 17.51 17.71 17.82 17.82 18.06 18.18 17.08 17.10 17.10 16.92 7 17.51 17.71 17.84 17.83 17.99 18.18 16.73 17.17 17.14 17.05 8 9 17.55 17.63 17.73 17.74 17.77 17.79 17.14 17.84 18.04 18.06 18.19 18.19 16.94 17.03 17.22 17.25 17.21 17.22 17.11 17.18 10 17.64 17.56 17.80 17.84 18.06 18.22 16.73 17.17 17.26 17.08 11 17.22 17.65 17.65 17.75 17.85 18.07 18.21 16.67 17.22 17.28 17.13 12 17.27 17.66 17.69 17.76 17.87 18.08 13.13 16.90 17.26 17.31 17.08 13 17.32 17.69 17.71 17.61 17.38 18.10 18.11 16.66 17.29 17.34 16.79 14 17.36 17.70 17.62 17.49 17.89 18.09 18.10 16.82 17.29 17.35 15.97 15 17.40 17.61 17.63 17.52 17.39 18.12 18.11 16.92 17.25 17.37 16.55 16 17.41 17.70 17.56 17.02 17.91 18.13 18.15 17.01 17.28 17.32 16.69 17 18 17.44 17.47 17.72 17.71 17.69 17.69 17.15 17.30 17.94 17.93 18.13 18.15 18.15 18.18 17.08 17.00 17.34 17.35 17.31 17.40 16.57 16.31 19 17.50 17.70 17.70 17.41 17.94 18.17 13.20 16.71 1.7.36 17.42 16.30 20 17.52 17.73 17.66 17.43 17.96 18.07 13.12 16.86 17.30 17.42 16.17 21 17.56 17.75 17.62 17.54 17.1 18.08 13.11 16.95 17.34 17.44 16.09 22 23 24 17.57 17.59 17.62 17.76 17.75 17.76 17.65 17.67 17. 71 17.60 17.64 17.67 13.00 17.98 17.97 18.03 18.09 18.12 18.02 17.88 17.96 16.98 17.04 17.03 17.20 17.16 17.21 17.44 17.46 17.48 16.28 16.42 16.55 25 17.64 17.75 17.67 17.69 17.99 18.12 17.72 17.11 17.26 17.49 16.58 26 17.66 17.76 17.67 17.72 13.00 18.15 17.62 17.14 17.30 17.49 16.65 27 17.67 17.76 17.71 17.74 11.01 18.16 17.87 17.19 17.32 16.79 16.70 28 17.67 17.74 17.72 17.74 13.01 18.09 17.77 17.17 17.37 16.98 16.74 29 17.59 17.74 17.73 17.77 13.01 18.14 17.79 17.15 17.21 17.08 16.81 30 17.70 17.72 17.75 --- 13.02 18.17 17.22 17.15 16.95 17.12 16.86 31 --- 17.67 17.77 13.03 --- 17.30 --- 17.09 17.13 --- LOW 17.76 17.71 17.34 13.03 11.17 18.22 17.70 17.37 17.49 17.24 HIGH 17.40 17.61 17.02 17.77 17.99 17.22 16.66 16.93 16.77 15.97 321 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 175658066155401. Local number, 1. LOCATION.--Lat 17°56'58", long 66°15'54". Owner: P.R. Aqueduct and Sewer Authority. Name: Mar Negro. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Bored unused artesian well, diameter 3 in (8 cm). Depth 23 ft (7.0 m). DATUM.--Altitude of land-surface datum is about 3 ft (0.91 m) above mean sea level. Measuring point: Top of 1.5 in (3.8 cm) pipe fitting, 3.2 ft (0.98 m) above land-surface datum. REMARKS.--Observation well. Water levels affected by nearby pumping well. PERIOD OF RECORD.--September 1959 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, +1.83 ft (+0.56 m) above land-surface datum, Dec. 2, 1970; lowest measured, 3.60 ft (1.10 m) below land-surface datum, July 7, 1977. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 6 +0.20 Jan. 13 +0.31 Apr. 6 0.69 July 19 +0.05 Nov. 22 +0.11 Feb. 17 +0.36 May 3 1.05 Aug. 6 0.31 Dec. 9 +0.12 Mar. 23 0.30 June 12 0.03 Sept. 27 +0.78 175851066174601. Local number, 8. LOCATION.--Lat 17°58'51", long 66°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 in (41 cm) to 13 in (33 cm); cased 16 in (41 cm) 0-32 ft (0-9.8 m), 13 in (33 cm) 25-120 ft (7.6-36.6 m); perforated 25-120 ft (7.6-36.6 m). Depth 125 ft (38.1 m). DATUM.--Altitude of land-surface datum is about 29 ft (8.8 m) above mean sea level. Measuring point: Top of 1.0 in (2.54 cm) pipe in pump base, 1.2 ft (0.37 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1959 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 11.95 ft (3.64 m) below land-surface datum, Dec. 14, 1960; lowest measured, 42.95 ft (13.09 m) below land-surface datum, Dec. 9, 1975. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 5 a28.15 Jan. 13 a26.26 Apr. 6 a27.07 July 9 a32.73 Nov. 4 a21.60 Feb. 17 a36.78 May 3 a36.55 Aug. 6 a27.52 Dec. 8 a25.85 Mar. 23 a27.10 June 12 a22.65 Sept. 28 a27.28 + Above land-surface datum. a Pumping. 322 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 180044066153401. Local number, 18. LOCATION.--Lat 18°00'44", long 66°15'34". 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 (41 to 30 cm), cased 16 in (41 cm) 0-40 ft (0-12-2 m), 12 in (30 cm) 0-53 ft (0-16.2 m), perforated 32-53 (9.8-16.2 m). Depth 125 ft (38.1 m). DATUM.--Altitude of land-surface datum is about 140 ft (42.7 m) above mean sea level. Measuring point: Top of 1.0 in (2.54 cm) pipe in pump base, 1.25 ft (0.38 cm) above land-surface datum. REMARKS.--Observation well. Water level affected by nearby pumpage. PERIOD OF RECORD.--September 1959 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 14.67 ft (4.47 m) below land-surface datum, Sept. 20, 1960; lowest measured, 79.17 ft (24.13 m) below land-surface datum, June 19, 1968. WATER LEVEL, IN FEET BELOW LAND SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 5 24.61 Jan. 13 28.40 Apr. 6 32.45 July 9 35.88 Nov. 4 25.75 Feb. 17 32.37 May 3 33.90 Aug. 6 36.58 Dec. 8 24.07 Mar. 23 31.52 June 6 35.24 Sept. 25 27.14 180023066175301. Local number, 19. LOCATION.--Lat 18°00'23", long 66°17'53". 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 (41 to 28 cm), cased 16 in (41 cm) 0-64 ft (0-19.5 m), 11 in 0-80 ft (0-24.4 m), perforated 16-64 ft (4.9-19.5 m). Depth 150 ft (45.7 m) reported, 86 ft (26.2 m) measured. DATUM.--Altitude of land-surface datum is about 140 ft (42.7 m) above mean sea level. Measuring point: Top of 1.0 in (2.54 cm) casing liner, 0.85 ft (0.26 m) above land-surface datum. After Apr. 8, 1983, top of 4.0 in (10.1 cm) flat cap on new concrete slab, 3.6 ft (1.10 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--December 1958 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 39.38 ft (12.00 m) below land-surface datum, Oct. 15, 1979; lowest, 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 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 5 50.24 Jan. 13 45.16 Apr. 6 47.70 July 9 52.83 Nov. 4 50.20 Feb. 17 46.73 May 3 55.57 Aug. 6 53.90 Dec. 8 47.62 Mar. 23 47.72 June 6 51.52 Sept. 25 52.11 323 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 175829066232201. Local number, 87. LOCATION.--Lat 17°58'29", long 66°23'22". Owner: Francisco Alomar. Name: Alomar 1. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 m), iron cased. Depth 112 ft (34.14 m). DATUM.--Altitude of land-surface datum is about 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, 8.45 ft (2.58 m) below land-surface datum, Dec. 10, 1970; lowest 49.18 ft (14.99 m) below land-surface datum, July 27, 1974. WATER LEVEL, IN FEET 3ELOW LANG-SURgACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEASER 1984 INSTANTANEOUS JeSERVATIONS AT 1270 DAY OCT NOV OEC JAN xE3 MAR APR MAY JUN JUL AU; SEP 1 27.44 26.53 25.69 27.29 27.44 23.68 30.05 30.53 11.57 31.18 30.65 32.66 2 26.88 26.32 26.14 27.24 27.49 23.69 29.30 30.74 71.31 31.13 30.63 32.62 3 26.49 26.44 26.21 27.28 27.53 23.73 29.83 30.79 31.13 31.43 30.76 32.05 4 26.33 26.65 26.26 27.39 27.55 23.31 29.98 30.77 31.21 31.55 30.81 31.65 5 26.16 26.96 26.25 27.73 27.47 23.19 30.12 30.38 31.44 31.43 30.82 31.40 6 7 26.24 26.34 25.34 23.02 26.29 26.31 26.37 26.97 27.30 27.39 23.75 24.05 30.19 30.23 31.55 30.43 31.57 31.45 3).80 30.57 30.86 31.19 31.13 31.15 8 26.47 25.02 26.35 27.28 27.10 29.25 30.03 30.79 31.59 30.41 31.37 31.16 9 26.81 25.13 26.31 26.07 27.44 24.18 30.02 30.97 31.35 30.33 31.50 31.54 10 26.90 25.28 26.33 26.36 27.55 29.19 30.26 31.04 31.17 33.25 31.55 31.62 11 27.27 25.30 26.27 27.21 27.55 24.20 30.33 31.13 31.10 33.23 31.53 31.99 12 27.51 25.42 26.14 25.29 27.06 23.73 30.46 31.21 30.64 30.27 31.33 32.32 13 14 27.56 27.75 25.48 25.41 26.19 26.22 25.15 25.23 26.93 27.10 2).18 24.26 30.35 30.54 31.00 30.95 30.51 30.41 30.26 33.27 31.44 31.63 31.52 31.60 15 27.77 25.50 26.23 25.96 27.54 29.26 30.31 31.22 30.33 30.27 31.74 31.58 16 27.30 25.53 26.14 26.65 27.53 24.46 30.20 31.35 30.32 30.45 31.74 31.55 17 27.07 25.48 26.06 25.97 27.78 24.63 30.38 31.40 30.29 30.70 32.00 31.47 18 27.08 25.33 25.74 26.74 27.37 29.51 30.45 31.43 30.43 30.64 32.07 31.34 19 27.13 25.36 25.41 27.16 27.27 29.44 30.23 31.26 30.73 30.58 31.85 30.81 20 27.08 25.38 25.31 25.77 27.61 24.72 30.26 30.92 30.79 30.50 31.96 30.38 21 22 26.91 26.84 25.42 25.48 25.57 25.67 26.49 26.55 27.64 28.00 2).69 29.73 30.23 30.22 30.95 31.28 30.84 30.84 30.49 30.43 32.14 32.42 29.63 29.42 27 26.90 25.56 25.72 26.77 27.79 24.76 30.15 31.44 30.87 30.59 32.51 29.19 24 26.83 25.58 25.88 26.36 28.13 29.70 30.14 31.53 30.83 30.50 32.66 28.94 25 26.95 25.66 26.72 26.97 28.23 29.73 30.57 31.50 30.66 30.36 32.61 29.72 26 27.06 25.70 26.85 27.09 28.33 29. 73 70.53 31.63 31.03 30.21 32.28 28.69 27 28 27.13 27.19 25.70 25.68 26.87 27.00 27.15 27.23 28.02 28.43 2).38 33.10 30.55 30.54 31.56 31.29 31.28 31.42 29.38 30.10 32.25 32.58 23.64 23.63 29 27.20 25.69 27.17 27.22 23.57 33.21 30.49 31.52 31.30 29.88 32.78 28.78 30 26.77 25.73 27.25 27.20 --- 31.30 30.42 31.54 31.24 30.20 32.90 28.58 31 26.51 --- 27.29 27.34 33.16 --- 31.27 --- 30.35 32.62 --- LOW 27.77 25.94 27.29 27.73 23.57 33.30 30.53 31.63 31.59 31.55 32.90 32.66 HIGH 26.16 25.02 25.31 25.96 26.98 21.19 29.30 33.43 30.29 29.88 30.65 23.58 WTR YR 1984 MEAN 23.93 LOW 32.90 HIGH 24.98 20 3 0 Lin 24 CO I-- 6.1 CI 0 b- 28 > N Li-10 cez w< 32 ASONDJFMAMJJ ASONDJFMAMJJASONDJFMAMJJ AS 1981 1982 1983 1984 36 324 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 180052066305001. Local number, 88. LOCATION.--Lat 18°00'52", long 66°30'50". Owner: Luce and Co. Name: Hacienda Potala. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 19 in (48 cm). Depth 143 ft (43.6 m). DATUM.--Altitude of land-surface datum is about 42.65 ft (13 m) above mean sea level. Measuring point: Top of shelter floor, 2.20 ft (0.67 m) 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 current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 4.50 ft (1.37 m) below land-surface datum; Feb. 26, 1971; lowest measured, 37.89 ft (11.55 m) below land-surface datum, July 16, 1968. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 5 17.00 Jan. 13 c21.23 Apr. 10 17.06 July 9 21.20 Nov. 4 15.60 Feb. 17 15.44 May 3 18.49 Aug. 7 28.80 Dec. 8 13.35 Mar. 23 16.68 June 6 c27.18 Sept. 5 21.43 175822066134801. Local number, 124. LOCATION.--Lat 17°58'22", long 66°13'48". Owner: P.R. Aqueduct and Sewer Authority. Name: Coqul 2. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 16 to 12 in (40 to 30 cm), cased 16 in (40 cm) 20-40 ft (6.1-12.2 m), 12 in (30 cm) 2-20 ft (0.61-6.1 m); perforated 20-118 ft (6.1-36.0 m). Depth 118 ft (36.0 m). DATUM.--Altitude of land-surface datum is about 26 ft (7.9 m) above mean sea level. Measuring point: Airline hole in pump base, 2.2 ft (0.67 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--April 24, 1975 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, a9.25 ft (a2.82 m) below land-surface datum, Nov. 29, 1979; lowest measured, a54.70 ft (a16.67 m) below land-surface datum, July 7, 1977. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 6 a13.99 Jan. 13 a14.02 Apr. 6 a38.70 July 9 a39.34 Nov. 22 a13.22 Feb. 17 a32.37 May 3 a45.63 Aug. 6 a20.05 Dec. 9 a12.80 Mar. 23 a33.47 June 12 a37.54 Sept. 27 a13.35 175750066225800. Local number, 144. LOCATION.--Lat 17°57'50", long 66°22'58". Owner: P.R. Aqueduct and Sewer Authority. Name: Jauca south well, site 1. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 8 in (20 cm), cased 0-50 ft (0-15.2 m), perforated 45-50 ft (13.7-15.2 m). Depth 50 ft (15.2 m). DATUM.--Altitude of land-surface datum is about 15.98 ft (4.87 m) above mean sea level. Measuring Point: Hole side of 8 in (20 cm) casing, 3.2 ft (0.98 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1980 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 9.48 ft (2.89 m).below land-surface datum, Jan. 20, 1982; lowest measured, 11.90 ft (3.63 m) below land-surface datum, Feb. 9, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 5 10.58 Jan. 13 10.03 Apr. 10 10.93 July 9 10.90 Nov. 4 10.37 Feb. 17 10.75 May 3 11.00 Aug. 7 11.87 Dec. 8 10.02 Mar. 23 11.15 June 6 10.79 Sept. 27 10.40 a Pumping. c Pumping nearby well. 325 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 (20 cm), cased 0-250 ft (0-76.2 m), perforated 245-250 ft (74.7-76.2 m). Depth 250 ft (76.2 m). DATUM.--Altitude of land-surface datum is about 16.11 ft (4.91 m) above mean sea level. Measuring point: Hole side of 8 in (20 cm) casing, 1.5 ft (0.46 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1980 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 9.50 ft (2.90 m) below land-surface datum, Jan. 20, 1982; lowest measured, 13.23 ft (4.03 m) below land-surface datum, Jan. 6, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTA/,.'EOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 5 10.68 Jan. 13 10.66 Apr. 10 11.50 July 9 11.43 Nov. 4 10.47 Feb. 17 9.98 May 3 11.53 Aug. 7 12.04 Dec. 8 10.18 Mar. 23 11.36 June 6 11.39 Sept. 27 10.62 175734066233300. Local number, 146. LOCATION.--Lat 17°57'34", long 66°23'33". Owner: P.R. Aqueduct and Sewer Authority. Name: Hacienda Alomar west well, site 3. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 8 in (20 cm), cased 0-70 ft (0-21.3 m), perforated 65-70 ft (19.8-21.3 m). Depth 70 ft (21.3 m). DATUM.--Altitude of land-surface datum is about 18.74 ft (5.71 m) above mean sea level. Measuring point: Hole side of 8 in (20 cm) casing, 2.5 ft (0.76 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--June 1981 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 8.32 ft (2.54 m) below land-surface datum, June 3, 1981; lowest measured, 12.49 ft (3.81 m) below land-surface datum, Aug. 17, 1981. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 5 11.13 Jan. 13 9.27 Apr. 10 10.50 July 9 10.30 Nov. 4 9.23 Feb. 17 10.00 May 3 10.69 Aug. 7 11.56 Dec. 8 9.07 Mar. 23 10.29 June 6 9.74 Sept. 27 9.04 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 (20 cm), cased 0-250 ft (0-76.2 m), perforated 245-250 ft (74.7-76.2 m). Depth 250 ft (76.2 m). DATUM.--Altitude of land-surface datum is about 18.80 ft (5.73 m) above mean sea level. Measuring point: Top of 8 in (20 cm) casing, 3.60 ft (1.10 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--June 1981 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 13.37 ft (4.08 m) below land-surface datum, January 13, 1984; lowest measured, 15.05 ft (4.59 m) below land-surface datum, August 7, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 5 13.86 Jan. 13 13.37 Apr. 10 14.22 July 9 14.30 Nov. 4 13.69 Feb. 17 14.00 May 3 14.40 Aug. 7 15.05 Dec. 8 13.50 Mar. 23 14.31 June 6 14.26 Sept. 27 13.66 326 GROUND-WATER LEVELS 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 (20 cm), cased 0-250 ft (0-76.2 m), diameter 2 in (5 cm), cased 0-200 ft (0-61.0 m), 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.--Altitude of land-surface datum is about 21.20 ft (6.46 m) above mean sea level. Measuring point: Hole side of 8 in (20 cm) casing, 2.8 ft (0.85 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--January 1981 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 12.82 ft (3.91 m) below land-surface datum, Dec. 23, 1981; lowest measured, 29.45 (8.98 m) below land-surface datum, Jan. 13, 1981. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 5 14.13 Jan. 13 14.66 Apr. 10 16.19 July 9 16.85 Nov. 4 15.29 Feb. 17 15.20 May 3 16.20 Aug. 7 17.42 Dec. 8 14.20 Mar. 23 16.20 June 6 17.60 Sept. 5 18.61 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 (20 cm), cased 0-250 ft (0-76.2 m), diameter 2 in (5 cm), 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.--Altitude of land-surface datum is about 21.20 ft (6.46 m) above mean sea level. Measuring point: Hole side of 8 in (20 cm) casing, 2.8 ft (0.85 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--January 1981 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 12.07 ft (3.68 m) below land-surface, Dec. 23, 1981; lowest 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 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 5 13.44 Jan. 13 13.09 Apr. 10 14.64 July 9 15.00 Nov. 4 13.09 Feb. 17 13.50 May 3 15.62 Aug. 7 16.34 Dec. 8 13.07 Mar. 23 14.54 June 6 15.85 Sept. 5 17.81 327 GROUND-WATER LEVELS RIO INABON TO RIO LOCO BASINS 175922066495901. Local number, 16. LOCATION.--Lat 17°59'22", long 66°49'59". Owner: SucesiOn Lluveras. Name: Central San Francisco. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused artesian well, diameter 20 in (51 cm). Depth 185 ft (54'.4). DATUM.--Altitude of land-surface datum is about 30 ft (9.1 m) above mean sea level. Measuring point: Top of shelter's wooder Lase, 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 current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 1.43 ft (0.44 m) below lend-surface datum, Dec. 22, 1960; lowest 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 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 3 6.23 Jan. 17 5.98 Apr. 3 6.62 July 2 1.85 Nov. 1 6.15 Feb. 15 4.94 May 1 6.75 Aug. 2 7.34 Dec. 6 6.30 Mar. 20 6.44 June 4 5.91 Sept. 5 8.28 180057066361101. 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 (51 cm), cased 300 ft (91.4 m), perforated 80-300 ft (24.4-91.4 m). Depth 300 ft (91.4 m). DATUM.--Altitude of land-surface datum is about 53 ft (16.2 m) above mean sea level. Measuring point: Bottom edge 1.5 in (3.8 cm) 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 current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 17.43 ft (5.31 m) below land-surface datum, Dec. 14, 1960; lowest 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 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 3 a80.35 Jan. 18 a72.58 Apr. 4 a75.82 July 5 a81.70 Nov. 2 a73.00 Feb. 16 a72.80 May 2 a80.30 Aug. 3 a83.39 Dec. 7 a72.84 Mar. 21 a77.32 June 6 a80.00 Sept. 5 a82.94 180150066474901. 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 (41 to 30 cm), cased 16 in (41 cm) 0-40 ft (0-12.2 m), 12 in (30 cm) 0-120 ft (0-36.6 m), perforated 40-120 ft (12.2-36.6 m). Depth 120 ft (36.6 m). DATUM.--Altitude of land-surface datum is about 59 ft (18.0 m) above mean sea level. Measuring point: Top of 1.0 in (2.54 cm) pipe in pump base, 1.1 ft (0.34 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--November 1958 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 25.72 ft (7.84 m) below land-surface datum, Oct. 8, 1959; lowest measured, 75.1 ft (22.89 m) below land-surface datum, June 27, 1972. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 3 a30.90 Jan. 18 a33.38 Apr. 4 a36.35 July 3 a42.60 Nov. 2 a32.59 Feb. 16 a32.81 May 2 a39.86 Aug. 2 a40.81 Dec. 7 a34.10 Mar. 20 a35.39 June 4 a37.44 Sept. 5 a40.36 a Pumping. 328 GROUND-WATER LEVELS RIO INABON TO RIO LOCO BASINS 180110066473501. 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 (41 cm), cased 0-103 ft (0-31.4 m), perforated 39-103 ft (11.9-31.4 m). Depth 102 ft (31.1 m). DATUM.--Altitude of land-surface datum is about 34 ft (10.4 m) above mean sea level. 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 current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 8.56 ft (2.61 m) below land-surface datum, Oct. 21, 1960; lowest 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 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 3 a15.87 Jan. 18 a15.25 Apr. 4 a15.76 July 3 a57.45 Nov. 2 al5.80 Feb. 16 a15.33 May 2 al6.50 Aug. 2 18.40 Dec. 7 a15.75 Mar. 20 a15.53 June 4 a20.55 Sept. 5 a48.55 180058066502701. Local number, 131. IOCATION.--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 m). DATUM.--Altitude of land-surface datum is about 66 ft (20.1 m) above mean sea level. 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 current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 0.46 ft (0.14 m) below land-surface datum; June 14, 1979; lowest 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 Water Date level Date level Date level Date level Oct. 3 9.60 Jan: 17 8.08 Apr. 3 10.38 July 2 12.24 Nov. 1 9.14 Feb. 15 8.67 May 1 11.59 Aug. 2 12.13 Dec. 6 8.22 Mar. 19 9.72 June 4 11.50 Sept. 5 12.18 a Pumping. 329 GROUND-WATER LEVELS RIO INABON TO RIO LOCO BASINS 180133066503301. 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 (51 cm) 0-20 ft (0-6.1 m), 12 in (30 cm) perforated pipe 20-84 ft (6.1-25.61 m), 10 in (25 cm) perforated pipe 84-190 ft (25.61-57.93 m). Depth 190 ft (57.93 m). Datum.--Altitude of land-surface datum is about 75 ft (22.87 m) above mean sea level. 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, 36.91 ft (11.25 m) below land-surface datum, June 27, 1974. WATER LEVEL, IN FEET .FLCW LAND-SURFACE DATUM, WATER YEAR OCTCEER 1985 TO SEPTEHS5R 1934 INSTANTANEOUS O?..iERVATIONS AT 1230 DAY OCT NOV DEC JAN FEE MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 8.7o 8.77 8.91 9.97 9.05 3.12 8.16 9.13 7.68 7.15 6.96 7.04 6.99 7.0! 7.22 '.59 '.61 !.05 8.04 7.93 7.97 1. 92 3.37 1.94 3. 9A 7. 09 12.34 12.43 12.63 12.65 12.70 12.45 12.50 12.53 12.49 12.47 12.07 12.07 12.08 12.10 12.15 13.77 14.01 14.14 14.26 13.55 13.15 13.21 13.20 13.22 13.15 14.33 14.67 14.47 14.27 14.25 6 7 8 9 10 9.09 9.13 9.13 9.10 9.21 7.07 6.97 6.84 5.98 6.99 7.20 7.09 7.15 7.15 6.99 7.51 7.45 7.46 7.61 7.59 3.13 8.17 3.22 3.22 8.05 7.33 7.64 0.65 7.66 4.69 12.71 12.53 12.51 12.55 12.62 12.47 12.50 12.54 12.56 12.62 12.19 12.23 12.26 12.23 12.31 12.74 12.87 12.34 12.37 12.32 13.22 13.34 13.41 13.50 13.61 14.14 14.30 13.39 13.78 13.75 11 12 13 14 1.5 9.32 9.39 9.23 9.16 1.32 6.78 6.31 6.33 6.83 5.93 6.94 7.09 7.31 7.50 7.59 7.52 6.97 6.77 *.01 7.09 7.97 7.91 8.00 8.01 8.03 9.70 4. 73 7.79 9.90 13.00 12.65 12.68 12.70 12.61 12.52 12.67 12.70 12.76 12.85 12.75 12.37 12.51 12.62 12.63 12.74 12.30 1'.32 12.33 12.15 12.37 13.6! 13.67 13.76 13.89 13.97 13.34 13.86 13.78 13.75 13.59 16 17 18 19 20 8.72 8.76 8.63 9.45 8.35 6.94 7.07 7.16 6.99 6.98 7.64 7.52 7.22 --- 7.15 7.19 7.23 7.28 7.43 8.02 8.02 3.02 8.02 8.02 13.11 10.22 13.32 17.43 13.57 12.60 12.65 12.69 12.58 12.53 12.59 12.52 12.48 12.48 12.53 12.72 12.69 12.80 12.86 12.92 12.90 12.94 12.96 12.93 12.34 14.20 14.37 14.55 14.53 14.71 13.44 13.30 13.04 12.24 10.79 21 22 23 24 25 8.23 8.10 8.05 8.04 8.02 7.18 7.18 7.21 7.18 7.18 '.35 7.35 7.49 7.29 7.53 8.19 3.21 8.29 8.35 8.43 10.71 13.86 11.31 11.16 11.30 12.51 12.43 12.47 12.47 12.46 12.56 12.51 12.63 12.50 12.23 12.95 13.00 13.03 12.93 13.12 12.80 12.76 12.30 12.90 12.85 14.87 14.97 15.13 15.27 15.23 9.66 9.38 9.25 9.14 9.04 26 27 28 29 30 31 8.00 8.17 8.27 8.20 7.97 8.04 7.05 5.93 6.98 6.77 6.95 --- 7.70 7.76 7.57 7.71 7.76 7.92 8.43 1.57 8.81 8.81 --- 11.45 11.50 11.75 11.89 12.04 12.19 12.45 12.42 12.36 12.34 12.37 --- 12.23 12.19 12.15 12.14 12.12 12.08 13.24 13.36 13.49 13.69 13.84 --- 12.95 13.03 13.08 12.98 13.05 13.10 15.11 15.19 15.21 15.23 15.25 15.25 8.93 1.91 3.80 8.74 8.68 --- LOW HIGH 9.39 7.97 3.16 6.78 8.81 7.93 12.17 3.82 12.71 12.34 12.75 12.08 13.84 12.07 14.26 12.76 15.27 13.15 14.83 8.68 4 4\„ I SONDJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 1981 1982 1983 1984 + Above land-surface datum. 16 330 GROUND-WATER LEVELS RIO INABON TO RIO LOCO BASINS 180120066503201. 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 CHARACTERISTICS.--Drilled observation well, casing slotted 20-140 ft (6.1-42.7 m) open hole 140-163 ft (42.7-49.7 m). Depth 163 ft (49.7 m). DATUM.--Altitude of land-surface datum is about 87 ft (26.5 m) above mean sea level. Measuring point: Top of 3 in (0.08 m) pipe, 3.4 ft (1.04 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--July 1972 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 7.90 ft (2.41 m) below land-surface datum; June 14, 1979; lowest measured, 37.84 ft (11.53 m) below land-surface datum, June 27, 1974. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 3 11.95 Jan. 17 11.28 Apr. 3 14.15 July 8 16.94 Nov. 1 12.01 Feb. 15 11.66 May 1 15.39 Aug. 2 16.58 Dec. 6 11.50 Mar. 19 13.22 June 4 15.28 Sept. 5 17.80 331 GROUND-WATER LEVELS RIO INABON TO RIO LOCO BASINS 175950066354201. 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 to 10 in (41 to 25 cm), cased 16 in (41 cm) 2-20 ft (0.61-6.10 m), perforated 20-130 ft (6.10-39.63 m), 10 in (25 cm) 128-165 ft (39.02-50.30 m), perforated. Depth 165 ft (50.30 m). DATUM.--Altitude of land-surface datum is about 24 ft (7.32 m) above mean sea level. Measuring Point: Bottom edge of hole on side of casing, 1.90 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.--Oct. 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, 28.59 ft (8.714 m) below land-surface datum, July 9, 1982. WATER LEVEL, TN FEET 3ELDW LAND-SURF ACE DATUM, WATEI YEAR OCTISER 1983 TO SEPTEMBER 1984 NSTANTANEOUS OSSERVATTONS AT 1230 DAY OCT NOV DEC JAN ;Ca MAR APR MAY JUN JUL AUG SEP 1 16.55 17.50 18.27 1 7.34 17.59 17.43 17.51 13.33 13.27 17.43 20.22 2 16.49 17.40 18.44 17.29 17.63 17.45 17.66 18.7! 13.19 17.44 20.34 3 16.41 17.33 17.71 15.10 17.61 17.63 13.01 13.97 13.50 17.46 19.52 4 16.47 16.61 17.42 17.23 17.64 17.70 18.01 11.23 13.68 17.49 11.47 5 16.90 16.25 17.83 17.37 17.53 17.75 17.75 19.39 13.55 17.44 19.45 6 16.61 15.29 18.02 17.43 17.33 17.55 17.52 19.57 19.90 13.68 17.38 15.87 7 16.64 15.90 11.13 17.51 17.27 17.91 17.39 19.70 19.03 13.58 17.40 13.07 8 16.65 15.96 18.12 16.15 17.27 13.15 17.25 19.38 19.19 13.56 17.44 16.28 9 16.66 16.03 13.13 16.92 17.29 13.22 17.27 20.06 19.92 13.71 17.46 18.15 10 17.49 16.10 17.57 17.40 17.22 13.41 17.39 20.22 19.62 13.80 17.46 17.91 11 12 17.6) 17.66 16.22 15.19 17.82 17.32 1'.52 17.78 16.96 16.71 17.92 17.95 17.49 17.59 20.45 23.95 19.81 19.91 19.48 11.77 17.48 17.44 17.94 17.98 13 17.60 16.12 17.82 17.11 16.59 13.36 17.70 21.05 20.01 19.45 18.32 13.01 14 17.63 16.11 17.68 17.99 16.93 13.51 17.93 21.06 20.05 19.41 18.91 13.35 15 17.66 16.15 17.67 1 7.90 17.03 13.19 18.35 21.11 20.10 19.27 19.31 18.08 16 17.62 15.77 17.57 13.11 17.09 13.2P 18.51 20.72 20.05 19.19 19.43 19.77 17 17.57 16.59 17.49 13.27 17.1? 12.16 18.65 23.33 19.68 19.61 19.54 19.63 18 17.63 16.58 17.43 13.36 17.07 17.35 11.75 20.58 19.4 7 19.69 19.65 19.53 19 17.71 17.21 17.37 13.44 16.95 17.93 18.82 20.47 19.36 19.68 19.75 13.26 20 17.79 17.45 17.35 13.52 16.97 1 7.89 18.87 20.24 13.30 19.66 19.75 17.80 21 17.91 17.12 17.35 18.59 17.9? 17.94 18.87 20.07 19.13 19.59 19.86 16.79 22 18.53 17.14 17.66 13.71 17.11 11.07 18.81 20.01 19.05 19.41 19.98 16.33 23 18.26 17.53 17.72 13.76 17.15 13.05 18.77 19.96 19.02 19.35 20.11 16.07 24 18.27 17.84 17.67 11.21 17.18 14.05 18.77 --- 18.95 19.38 20.25 15.84 25 18.65 17.96 17.58 13.25 17.17 17.96 18.77 18.86 18.93 20.33 15.86 26 18.71 18.10 17.49 17.90 17.20 17.91 18.73 18.83 19.12 20.33 16.03 27 18.50 13.17 17.44 11.02 17.22 13.26 18.73 18.59 17.00 20.33 16.20 28 18.31 13.15 17.40 13.02 17.20 13.39 18.76 13.44 17.32 20.37 16.42 29 18.20 18.23 17.41 13.00 17.23 18.41 18.80 18.17 17.32 20.37 17.02 30 17.80 11.33 17.42 17.65 --- 18.43 18.23 18.37 17.30 20.37 16.88 31 17.54 --- 17.40 17.11 13.44 --- --- 17.38 20.31 --- LOW 18.71 18.33 18.44 18.76 17.69 13.51 18.37 19.77 20.37 20.22 HIGH 16.41 15.90 17.35 16.90 16.59 17.43 17.26 17.00 17.38 15.34 14 30 w, 18 m F F a L.,.1 6.1 LJ IJ Z < L- 22 -JD CC fryviNti '4y > La-J 0Z Lai < 26 30 ONDJFMAMJJASONDJEMAMJJASONDJEMAMJJ AS 1981 1982 1983 1984 332 GROUND-WATER LEVELS RIO GUANAJIBO BASIN 180933067050801. Local number, 40. LOCATION.--Lat 18°09'33", 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 (41 to 30 cm), cased 16 in (41 cm) 0-30 ft (0-9.1 m) 12 in (30 cm) 0-60 ft (0-18.3 m); perforated 12 (30 cm) 10-60 ft (3.0-18.3 m). Depth 105 (32.0 m). DATUM.--Altitude of land-surface datum is about 164 ft (50.0 m) above mean sea level. Measuring point: Lower edge of 0.75 in (1.90 cm) 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 current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 0.20 ft (0.06 m) below land-surface datum, Aug. 3, 1983; lowest measured, 37.30 ft (11.37 m) below land-surface datum, May 7, 1973. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 5 a14.31 Jan. 13 a14.43 Apr. 5 a14.84 Aug. 27 al4.25 Nov. 30 a14.28 Feb. 9 a14.71 June 7 12.52 Sept. 13 11.30 Dec. 8 a14.43 Mar. 6 a14.74 July 12 13.80 181018067091601. Local number, 43. LOCATION.--Lat 18°10'18", long 67°09'16". Owner: Mayaguez Sugar Co. Name: Central Rochelaise. AQUIFER.--Volcanic rocks of Cretaceous Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 12 in (30 cm), cased 0-45 ft (0-13.7 m), perforated 0-45 ft (0-13.7 m). Depth 80 ft (24.4 m). DATUM.--Altitude of land-surface datum is about 7 ft (2.1 m) above mean sea level. Measuring point: Top of 12 in (30 cm) casing, 1.9 ft (0.58 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--August 1959 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, +0 59 ft (+0.18 m) above land-surface datum, June 6, 1984; lowest 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 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 6 +0.50 Jan. 12 +0.45 Apr. 6 +0.47 July 11 +0.24 Nov. 3 +0.53 Feb. 8 +0.55 May 3 0.22 Aug. 10 0.53 Dec. 7 +0.53 Mar. 5 +0.42 June 6 +0.59 Sept. 12 +0.58 + Above land-surface datum. a Pumping. 333 38 GROUND-WATER LEVELS RIO GUANAJIBO BASIN 180132067033801. 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 (30 cm). Depth 200 ft (60.98 m). DATUM.--Altitude of land-surface datum is about 52.5 ft (16.0 m) above mean sea level. Measuring Point: Hole side of casing, 0.80 ft (0.24 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--Dec. 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, 39.34 ft (11.99 m) below land-surface datum, Apr. 10, 1983. WATER LEVEL, IN FEET 9'ELCW LANO -SUR'ACE C.ATUM, WATER YEAR CCTOEER 1183 TO SEPTEMEER 1914 INSTANTANEOUS 03SE9VATI0NS AT 1200 011Y OCT NOV )EC JAN cca AR APR MAY JUN XJL AUG SEP 1 39.34 39.34 38.90 72.90 33.85 31.46 39.29 39.56 39.53 39.67 39.44 39.49 2 39.33 39.01 38.91 31.38 33.85 33.99 39.30 31.56 39.54 39.70 30.45 39.49 3 39.33 33.99 38.90 33.90 3.8.34 39.00 39.31 39.55 39.52 39.69 39.45 39.50 4 39.37 33.59 38. 9 3 33.91 33.31 39.00 39.30 37.54 39.50 39.64 39.44 19.52 5 39.39 33.22 33.90 3 2.90 19.84 31.00 39.29 31.54 39.51 37.31 39.49 39.50 39.40 33.79 38.81 33.90 38.34 34.31 39.31 39.56 39.53 39.43 39.47 39.45 7 39.31 39.34 33.7? 39.75 38.89 38.90 33.75 31.77 38.16 38.86 3).15 39.07 39.32 39.33 39.56 39.56 39.54 39.54 3 9.43 39.50 39.45 39.45 37.49 39.50 9 39.72 33.71 31.83 33.93 38.37 37.17 39.32 79.55 39.54 39.51 39.46 39.46 10 39.29 33.71 31.87 31.91 38.85 37.06 39.33 39.57 39.55 37.50 39.43 39.44 11 39 .30 33.74 31.84 33.39 38.8: 39.05 39.31 39.55 39.56 39.47 39.43 39.45 12 39.32 33.73 35.83 31.16 38.27 31.11 39.33 3 9 .57 39.56 39.49 39.49 13 39.30 33.72 38.83 31.12 38.33 31.13 39.33 39.59 39.56 39.50 39.47 14 39.28 33.75 38.56 31.33 38.84 31.12 39.43 39.57 39.53 39.49 39.47 15 39.25 33.75 32.83 31.32 38.1 4 39.12 39.4J 39.55 39.61 39.49 39.45 16 17 39.24 39.24 31.'6 33.76 38.91 38.89 '1 13 33.. 90 32./4 32.35 39.12 33.11 39.40 39.43 31.53 31.54 39.61 39.57 37.46 39.46 39.46 39.45 18 39.20 33.79 33.87 '3.91 38.84 39.11 39.43 39.56 39.57 39.46 39.47 19 39.19 38.78 38.84 31.19 38.37 37.12 39.43 39.58 39.60 39.45 39.43 20 39.19 33.'9 38.87 73.14 38.'36 39.12 39.43 39.55 39.61 39.43 39.49 21 22 39.15 39.11 38.32 38.32 38.90 33.90 33.15 31.36 38.85 38.37 37 -14 39.17 39.43 39.42 39.58 39.60 39.59 39.59 31.43 31.42 39.50 39.48 23 39.12 33.10 33.58 33.33 38.33 31.19 39.45 39.59 39.61 39.43 39 .49 24 39.14 33.30 31.87 31.31 38.93 39.19 39.49 39.54 39.62 39.42 39.50 25 39.10 33.14 38.17 33.30 38.83 39.11 39.47 39.52 39.62 39.42 39.53 26 27 39.08 39.11 33.35 33.85 38.91 38.91 35.33 31.33 38.53 33.92 39.19 37.19 39.46 39.45 3/.53 39.54 39.63 39.66 39.42 37.45 39.52 39.52 39.12 28 39.14 38.34 38.9.2 33.81 38.95 37.20 39.49 39.55 39.67 37.46 39.53 39.11 29 39.13 33.36 31.90 33.32 33.95 39.21 39.51 39.54 39.70 39.44 39.54 39.10 30 39.03 33.39 18.91 33.44 --- 37.25 39.54 39.52 39.67 39.43 39.52 39.13 31 39.07 --- 33.90 31.34 39.27 --- 39.51 39.45 39.49 LOW 39.40 39.04 38.92 33.97 38.95 37.27 39.54 39.60 39.70 39.70 39.54 HIGH 39.07 38. 71 38.83 33.10 38.81 33.96 39.23 39.51 39.50 39.33 39.44 DJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 1981 1982 1983 1984 40 334 GROUND-WATER LEVELS RIO YAGUEZ AND RIO GRANDE DE ARASCO BASINS 181233067083201. Local number, 45. LOCATION.--Lat 18°12'33", long 67°08'32". Owner: Cervecerfa India, Inc. Name: Well 1, Mayaguez. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 12 in (30 cm), cased 0-82 ft (0-25.0 m). Depth 82 ft (25.0 m). DATUM.--Altitude of land-surface datum is about 23 ft (7.0 m) above mean sea level. 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.--1960 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 9.41 ft (2.87 m) below land-surface datum, Sept. 15, 1977; lowest 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 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 5 13.50 Jan. 12 13.33 Apr. 5 14.51 July 11 14.17 Nov. 3 13.08 Feb. 8 13.39 May 3 15.00 Aug. 9 13.81 Dec. 7 13.51 Mar. 5 13.11 June 7 15.18 Sept. 12 13.45 181522067090901. 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 (20 cm), cased 0-114 ft (0-34.8 m), perforated 82-114 ft (25.0-34.8 m), open hole 114-353 ft (34.8-107.6 m). Depth 353 ft (107.6 m). DATUM.--Altitude of land-surface datum is about 20 ft (6.1 m) above mean sea level. 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 current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 0.96 ft (0.29 m) below land-surface datum, Oct. 5, 1978; lowest 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 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATION Water Water Water Water Date level Date level Date level Date level Oct. 5 2.62 Jan. 12 3.97 Apr. 5 5.55 July 12 2.32 Nov. 3 2.07 Feb. 8 4.72 May 3 6.09 Aug. 9 2.42 Dec. 7 2.78 Mar. 5 4.68 June 7 3.04 Sept. 12 2.04 335 GROUND-WATER LEVELS RIO CULEBRINAS BASIN 182228067113301. 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 in (51 cm) to 12 in (30 cm), cased 20 in (51 cm) 0-40 ft 0-40 ft (0-12.2 m), 12 in (30 cm) 0-60 ft (0-18.3 m), perforated 40-60 ft (12.2-18.3 m). Depth 160 ft (48.8 m). DATUM.--Altitude of land-surface datum is about 30 ft (9.1 m) above mean sea level. Measuring point: Lower edge of 0.75 in (1.90 cm) 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 current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, +0.81 ft (+0.25 m) above land-surface datum, Sept. 12, 1975; lowest measured, 83.53 ft (25.46 m) below land-surface datum, Aug. 7, 1974. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 5 0.38 Jan. 12 2.49 Apr. 5 2.76 July 11 0.12 Nov. 3 0.70 Feb. 8 2.90 May 3 3.33 Aug. 9 1.24 Dec. 7 1.64 Mar. 5 2.13 June 6 1.55 Sept. 12 1.11 182018066593201. Local number, 83. LOCATION.--Lat 18°20'18", long 66°59'32". Owner: P.R. Water Resources Authority. Name: San Sebastian. AQUIFER.--Volcanic rock of Eocene Age. WELL CHARACTERISTICS.--Drilled observation well, diameter 6 in (15 cm). Depth 300 ft (91.4 m). DATUM.--Altitude of land-surface datum is about 230 ft (70.1 m) above mean sea level. Measuring point: Top of casing, 2.40 ft (0.73 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--May 1967 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 21.95 ft (6.69 m) below land-surface datum, Apr. 15, 1976; lowest measured, 40.20 ft (12.25 m) below land-surface datum, July 21, 1970. WATER LEVEL, IN FEET BELOW LAND-SURFACE. DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 4 27.90 Jan 11 29.72 Apr. 4 30.44 July 3 27.56 Nov. 3 27.85 Feb. 7 30.12 May 1 30.07 Aug. 8 29.20 Dec. 6 29.08 Mar. 1 30.18 June 5 27.96 Sept. 5 28.04 + Above land-surface datum. Surf ace- Water Records for U.S. Virgin Islands 338 86°05' 65°00' 55' 64°50' 18°24' 18°20' 18°22' 64°50' I ..s==7 .:: 7 CZ) 'c.: 2 ST. JOHN 2950 45' 64°40' 1 18°18' 1 17°45' 17°40' Figure 26.--Location of surface-water stations in the U.S. Virgin Islands. --- --- 339 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 mi (4.02 km) northwest of Fort Christian, Charlotte Amalie. DRAINAGE AREA.--0.49 sq mi (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 and concrete control. Altitude of gage is 280 ft (85.3 m), from topographic map. December 1962 to February 1967 at site about 100 ft (30.5 m) downstream at different datum. March 1979 to April 1981 at site about 100 ft (30.5 m) upstream at different datum. REMARKS. - -Records poor. AVERAGE DISCHARGE.--6 years (1964-66, 1980, 1983-84), 0.21 cu ft/s (0.0059 cu m/s), 5.82 in/yr (147.8 mm/yr), 152 acre-ft/yr (0.187 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 above base 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) (m) Date Time (cu ft/s) (cu m/s) (ft) (m) Nov. 4 0915 58 1.64 1.52 0.463 June 5 1800 *63 1.78 1.56 0.475 Feb. 9 0015 56 1.59 1.50 0.457 No flow parts or all of many days. DISCHARGE, IN CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAT JUN JUL AUG SEP 1 .02 .03 .01 .02 .05 .02 .01 .04 .04 .02 .04 .02 2 .01 .03 2.1 .02 .05 .03 .00 .02 .05 .01 .03 .02 3 .01 .05 .09 .02 .05 .02 .01 .02 .05 .01 .01 .02 4 .02 10 .05 .03 .04 .03 .02 .03 .04 .02 .22 .02 5 .01 2.1 .03 .03 .05 .02 .01 .03 4.3 .02 .04 .02 6 .02 .23 .03 .05 .D5 .01 .02 .04 .59 .02 .02 .02 7 .01 .14 .02 .03 .05 .01 .02 .04 .09 .02 .01 .02 8 .02 .10 .03 .05 .51 .02 .03 .02 .04 .02 .01 .02 9 .01 .09 .03 .06 2.5 .02 .02 .02 .03 .02 .01 .01 10 .02 .06 .04 .05 .07 .02 .02 .02 .02 .02 .02 .01 11 .01 .05 .04 .05 .04 .02 .04 .02 .02 .03 .02 .01 12 .02 .06 .03 .07 .04 .03 .02 .02 .02 .01 .02 .03 13 .01 .05 .03 .03 .02 .02 .03 .04 .01 .01 .01 .02 14 .02 .07 .03 .04 .03 .02 .03 .05 .01 .01 .02 .01 15 .01 .06 .03 .03 .03 .02 .03 .02 .01 .01 .02 .01 16 .01 .05 .03 .05 .02 .02 .03 .02 .02 .01 .02 .02 17 .01 .06 .03 .02 .03 .01 .04 .02 .01 .01 .01 .02 18 .01 .05 .03 .02 .05 .01 .03 .02 .01 .01 .01 .03 19 .01 .05 .05 .02 .05 .01 .05 .01 .02 .01 .01 .03 20 .02 .05 .05 .03 .05 .01 .04 .02 .02 .01 .01 .03 21 .01 .05 .05 .04 .05 .01 .05 .03 .02 .01 .01 .12 22 .02 .05 .04 .03 .05 .01 .05 .02 .02 .01 .06 .03 23 .02 .06 .03 .03 .05 .01 .03 .05 .02 .01 .01 .03 24 .02 .05 .02 .03 .04 .01 .03 .02 .01 .01 .01 .06 25 .06 .05 .02 .03 .02 .01 .05 .02 .01 .01 .01 .04 26 .02 .05 .04 .02 .03 .01 .05 .02 .01 .01 .02 .02 27 .02 .05 .05 .02 .03 .01 .03 .01 .01 .01 .02 .04 28 .03 .05 .03 .02 .04 .01 .02 .03 .01 .01 .02 .05 29 .02 .05 .05 .02 .03 .01 .03 .03 .02 .01 .02 .04 30 .06 .03 .03 .04 --- .01 .03 .02 .02 .01 .02 .06 31 .02 .02 .05 .01 .06 --- .02 .02 --- TOTAL .58 13.87 3.16 1.05 4.12 .48 .87 .83 5.55 .42 .78 .88 MEAN .019 .46 .10 .034 .14 .015 .029 .027 .19 .014 .025 .029 MAX .06 10 2.1 .07 2.5 .03 .05 .06 4.3 .03 .22 .12 MIN .01 .03 .01 .02 .02 .01 .00 .01 .01 .01 .01 .01 CFSM .04 .94 .20 .07 .29 .03 .06 .06 .39 .03 .05 .06 IN. .04 1.05 .24 .08 .31 .04 .07 .06 .42 .03 .06 .07 AC-FT 1.2 28 6.3 2.1 8.2 1.0 1.7 1.6 11 .8 1.5 1.7 CAL YR 1983 TOTAL 246.57 MEAN .68 MAX 169 MIN .01 CFSM 1.39 IN 18.68 AC-FT 489 VTR YR 1984 TOTAL 32.59 MEAN .089 MAX 10 MIN .00 CFSM .18 IN 2.47 AC-FT 65 340 ST. THOMAS, U.S. VIRGIN ISLANDS 50252000 BONNE RESOLUTION GUT AT BONNE RESOLUTION, ST. THOMAS, VI--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--MARCH 1913 TO CURRENT YEAR WATER-UALITY DATA. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOW, SPECIFIC CON­ TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMMOS) (DEG C) (CFS) (UMMOS) (DEG C) OCT, 25 1028 .05 1252 24.5 MAY, 23 1642 .048 2141 22.5 NOV. 30 1704 .03 195' 23.5 JUL. 26 1213 .005 2160 28.0 JAN, 23 1331 .03 2163 24.5 AUG, 24 1117 .009 1900 26.0 APR. 04 1350 .017 2020 25.0 --- 341 ST. THOMAS, U.S. VIRGIN ISLANDS 50276000 TURPENTINE RUN AT MARIENDAL, ST. THOMAS, VI LOCATION.--Lat 18°19'48", long 64°52'58", Hydrologic Unit 21020001, on left bank, at Mariendal, 1.0 mi (1.6 km) upstream from mouth, and 3.3 mi (5.3 km) southeast of Fort Christian, Charlotte Amalie. DRAINAGE AREA.--2.97 sq mi (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 recorder. Altitude of gage is 40 ft (12.2 m), from topographic map. REMARKS.--Records poor. Since about 1975, low flow augmented by discharges from sewage plant. AVERAGE DISCHARGES.--9 years (1964-68, 1979-80, 1983-84), 1.04 cu ft/s (0.029 cu m/s), 4.76 in/yr (121 mm/yr), 753 acre-ft/yr (0.93 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), from floodmark, from 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 above base of 100 cu ft/s (2.83 cu m/s) and maximums (*): 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. 4 0930 186 5.268 3.35 1.021 Sept. 17 2115 178 5.041 3.31 1.009 June 5 1715 *333 9.430 3.95 1.204 No flow part of each day Apr. 12, May 7, 11. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .45 .33 .43 .26 .38 .17 .39 .11 .89 .25 .40 .11 2 .45 .35 10 .28 .38 .15 .28 .10 .96 .15 .44 .09 3 .45 1.3 .76 .24 .53 .25 .23 .09 1.2 .22 .34 .08 4 .45 45 .36 .27 .48 .17 .24 .15 .85 .29 4.9 .10 5 .53 16 .42 .30 .67 .18 .22 .13 37 .27 .20 .83 6 .33 3.6 .49 .36 .56 .19 .26 .13 14 .27 .14 .10 7 .45 1.8 .28 .46 .54 .20 .31 .07 6.8 .34 .11 .09 8 .45 1.4 .44 .36 .63 .19 .27 .11 1.4 .42 .10 .10 9 .45 3.2 .25 .32 2.6 .18 .23 .10 1.0 .27 .09 .16 10 .45 1.4 .27 .46 .57 .28 .16 .10 .82 .23 .08 .10 11 .38 1.2 .28 .32 .48 .25 .16 .10 .90 .30 .08 .09 12 .45 1.1 .36 .36 .51 .23 .13 .18 1.0 .24 .09 .30 13 .38 1.0 .26 .39 1.0 .22 .16 .22 .80 .21 .11 .12 14 .45 1.0 .26 2.0 .44 .18 .18 .13 .50 .24 .08 .11 15 1.2 1.0 .26 .36 .96 .20 .30 .17 .38 .27 .12 .10 16 .45 .91 .22 1.1 .51 .22 .21 .16 .36 .17 .09 .20 17 .45 .86 .24 .46 .44 .38 .19 .18 2.0 .21 .08 8.1 18 .33 .80 .24 .49 .46 .29 .21 .19 1.0 .19 .09 6.2 19 .33 .70 .23 .38 .45 .24 .24 .26 .50 .19 .08 .87 20 .33 .60 .27 .50 .42 .24 .34 .30 .30 .26 .08 .65 21 .33 .86 .24 .78 .34 .26 .44 .14 .20 .22 .11 .40 22 .38 .54 .27 .90 .35 .25 .32 .16 .16 .33 1.4 .30 23 .38 .60 .38 .63 .32 .21 .25 .20 .13 .23 .17 .20 24 .33 .50 .30 .51 .34 .24 .28 .34 .12 .23 .13 .17 25 .33 .43 .26 .62 .38 .24 .31 .34 .11 .21 .18 .20 26 .48 .40 1.1 .60 .34 .22 .37 .34 .10 .22 .20 .60 27 .33 .40 .29 .48 .27 .24 6.3 .52 .20 .18 .09 1.1 28 .40 .38 .30 .55 .26 .23 1.4 .48 .13 .24 .09 2.8 29 1.5 .60 .40 .45 .19 .24 .18 .33 .12 .24 .09 .70 30 .56 .23 .77 .42 --- .15 .11 .46 .25 .18 .1-1 2.5 31 .36 --- .34 .46 .23 1.3 --- .19 5.2 --- TOTAL 14.59 88.49 20.97 16.07 15.80 6.92 14.67 7.59 74.18 7.46 15.47 27.47 MEAN .47 2.95 .68 .52 .54 .22 .49 .24 2.47 .24 .50 .92 MAX 1.5 45 10 2.0 2.6 .38 6.3 1.3 37 .42 5.2 8.1 MIN .33 .23 .22 .24 .19 .15 .11 .07 .10 .15 .08 .08 CFSM .16 .99 .23 .18 .18 .07 .17 .08 .83 .08 .17 .31 IN. .18 1.11 .26 .20 .20 .09 .18 .10 .93 .09 .19 .34 AC-FT 29 176 42 32 31 14 29 15 147 15 31 54 CAL YR 1983 TOTAL 1593.94 MEAN 4.37 MAX 1000 MIN ..04 CFSM 1.47 IN 19.96 AC-FT 3160 WTR YR 1984 TOTAL 309.68 MEAN .85 MAX 45 MIN .07 CFSM .29 IN 3.88 AC-FT 614 342 ST. THOMAS, U.S. VIRGIN ISLANDS 50276000 TURPENTINE RUN AT MARIENDAL, ST. THOMAS, VI--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--MARCH 1983 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON­ DUCTANCE (UMMOS) TEMPERA- TURE (DEG C) DATE TIME STREAMFLOWs INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMNOS) TEMPERA­ TORE (DEG C) OCT, 26 1320 NOV, 29 1210 JAN, 25 1000 APR, 04 1026 .61 2.0 .65 .14 2133 2179 750 2100 29.5 25.5 26.0 27.0 MAY, 23 1406 JUL, 26 1001 AUG, 24 0901 .33 .13 .03 2241 2130 1700 31.0 27.5 27.0 343 ST. JOHN, U.S. VIRGIN ISLANDS 50295000 GUINEA GUT AT BETHANY, ST. JOHN, VI LOCATION.--Lat. 18°19'55", long 64°46'50", Hydrologic Unit 21020001, 600 ft (183 m) southeast of Bethany Church, and 1.0 mi (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. Altitude of gage is 260 ft (79.2 m), from topographic map. Prior to September 1982, at datum 1.00 ft (0.305 m) higher. REMARKS.--Records poor. AVERAGE DISCHARGE.--6 years(1964-67, 1983-84), 0.072 cu ft/s (0.002 cu m/s), 2.64 in/yr (67.1 mm/yr), 52.16 acre-ft/yr (0.064 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 946 cu ft/s (26.8 cu m/s) Apr. 18, 1983, gage height, 5.33 ft (1.625 m), from floodmark, from rating curve extended above 1.0 cu ft/s (0.028 cu m/s) on basis of step-backwater analysis and slope-area measurement of peak flow; no flow many days each year. EXTREMES FOR CURRENT YEAR.--Peak discharges above base of 10 cu ft/s (0.283 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. 4 0845 *136 3.85 2.93 0.893 Nov. 4 2330 14 0.40 2.10 0.640 No flow many days. DISCHARGE• IN CJBIC FEET PER SECOND. WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .01 .01 .01 .01 .01 .00 .00 .01 .00 .01 .01 .00 2 .01 .01 .02 .01 .01 .00 .00 .01 .00 .01 .01 .00 3 .01 .01 .01 .01 .00 .00 .00 .01 .00 .01 .01 .01 4 .03 13 .01 .01 .00 .01 .01 .00 .00 .01 .11 .01 5 .02 2.5 .01 .01 .01 .00 .01 .00 .01 .01 .00 .00 6 .02 .29 .01 .01 .01 .01 .01 .00 .12 .01 .00 .00 7 .03 .08 .00 .01 .01 .01 .01 .00 .02 .00 .00 .00 3 .03 .04 .01 .01 .01 .01 .01 .00 .01 .00 .00 .00 9 .01 .03 .01 .01 .01 .01 .01 .00 .01 .01 .00 .00 10 .01 .02 .01 .01 .01 .01 .01 .00 .01 .00 .00 .00 11 .01 .02 .01 .01 .01 .01 .01 .00 .01 .01 .00 .00 12 .03 .03 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 13 .03 .04 .01 .01 .01 .01 .01 .01 .01 .00 .00 .00 14 .01 .05 .01 .01 .01 .01 .01 .00 .01 .01 .00 .00 15 .02 .05 .01 .01 .01 .00 .01 .00 .01 .01 .00 .00 16 .02 .05 .01 .01 .00 .01 .01 .00 .01 .01 .00 .00 17 .02 .03 .01 .01 .00 .00 .01 .00 .01 .01 .00 .00 18 .02 .01 .01 .01 .00 .00 .01 .00 .01 .00 .01 .00 19 .02 .01 .01 .01 .00 .01 .01 .00 .01 .01 .01 .00 20 .01 .01 .01 .01 .00 .01 .01 .00 .01 .01 .00 .00 21 .02 .01 .01 .01 .00 .01 .01 .00 .01 .01 .01 .00 22 .02 .01 .01 .01 .00 .01 .00 .00 .01 .01 .00 .00 23 .02 .01 .01 .01 .01 .01 .00 .00 .01 .01 .00 .00 24 .01 .01 .01 .00 .00 .01 .00 .00 .01 .01 .00 .00 25 .00 .01 .01 .01 .00 .01 .00 .01 .01 .01 .00 .00 26 .01 .01 .01 .01 .00 .00 .00 .01 .01 .01 .00 .00 27 .01 .01 .01 .01 .00 .00 .01 .00 .01 .01 .00 .00 28 .01 .01 .01 .01 .00 .00 .01 .01 .01 .01 .00 .00 29 .01 .01 .01 .01 .00 .00 .01 .01 .01 .01 .00 .00 30 .01 .01 .01 .01 .00 .01 .01 .00 .01 .00 .00 31 .01 --- .01 .01 .00 --- .01 --- .01 .00 --- TOTAL .50 16.39 .31 .30 .14 .18 .22 .11 .37 .26 .18 .03 MEAN .016 .55 .010 .010 .005 .006 .007 .004 .012 .008 .006 .001 MAX .03 13 .02 .01 .01 .01 .01 .01 .12 .01 .11 .01 MIN .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 CFSM .04 1.49 .03 .03 .01 .02 .02 .01 .03 .02 .02 .003 IN. .05 1.64 .03 .03 .01 .02 .02 .01 .04 .03 .02 .00 AC-FT 1.0 33 .6 .6 .3 .4 .4 .2 .7 .5 .4 .06 CAL YR 1983 TOTAL 142.93 MEAN .39 MAX 110 MIN .00 CFSM 1.05 IN 14.33 AC-FT 284 WTR YR 1984 TOTAL 18.99 MEAN .052 MAX 13 MIN .00 CFSM .14 IN 1.90 AC-FT 38 WATER QUALITY RECORDS PERIOD OF RECORD.--MARCH 1983 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UNHOS) (DEG C) OCT, 27 0910 .006 2376 25.5 MAY, 15 1028 .002 2170 27.0 NOV, 30 0954 .007 2346 24.0 JUL, 25 1036 .007 2200 26.0 JAN. 24 0926 .004 2110 26.0 AUG, 25 0927 .002 2200 25.5 APR. 03 0943 .003 2100 23.5 344 ST. CROIX, U.S. VIRGIN ISLANDS 50345000 JOLLY HILL GUT AT JOLLY HILL, ST. CROIX, VI LOCATION.--Lat 17°44'00", long 64°51'47", Hydrologic Unit 21020002, on Mahogany Road at Jolly Hill, 1.8 mi (2.9 km) northeast of Frederiksted. DRAINAGE AREA.--2.10 sq mi (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 and V-notch concrete control. Altitude of gage is 140 ft (42.7 m) from topographic map. REMARKS.--Records poor. AVERAGE DISCHARGE.--7 years (1964-68, 1983-84), 0.027 cu ft/s (0.001 cu m/s), 0.17 in/yr (4.3 mm/yr), 19.6 acre-ft/yr (0.02 cu hm/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 223 cu ft/s (6.315 cu m/s) Dec. 12, 1965, gage height, 3.15 ft (0.96 m); no flow many days each year. EXTREMES FOR CURRENT YEAR.--Peak discharges above base of 25 cu ft/s (0.71 cu m/s) and maximum (*): Date Discharge Time (cu ft/s) (cu m/s) Gage height (ft) (m) Nov. 4 0945 *30 0.850 2.05 0.625 No flow many days. DISCHARGE, IN CUBIC FEET PER SECOND' WATER TEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAT JUN JUL AUG SEP 1 .08 .03 .13 .07 .08 .04 .05 .02 .02 .00 .00 .00 2 .08 .03 .13 .07 .07 .03 .04 .02 .00 .00 .00 .00 3 .07 .03 .14 .07 .06 .03 .05 .02 .00 .00 .00 .00 4 .07 .81 .15 .07 .05 .03 .04 .01 .00 .00 .00 .00 5 .08 .20 .14 .07 .05 .04 .03 .01 .00 .00 .00 .00 6 .07 .12 .14 .09 .05 .04 .03 .01 .00 .00 .00 .00 7 .07 .11 .14 .11 .08 .03 .03 .03 .00 .00 .00 .00 8 .07 .12 .13 .09 .10 .04 .03 .03 .00 .00 .00 .00 9 .07 .12 .12 .09 .09 .05 .03 .02 .00 .00 .00 .00 10 .06 .14 .12 .10 .08 .05 .03 .01 .00 .00 .00 .00 11 .06 .14 .13 .09 .06 .04 .03 .01 .00 .00 .00 .00 12 .06 .15 .11 .08 .06 .04 .02 .01 .00 .00 .00 .00 13 .07 .15 .10 .08 .06 .04 .02 .00 .00 .00 .00 .00 14 .06 .15 .10 .08 .06 .07 .01 .00 .00 .00 .00 .00 15 .06 .15 .11 .07 .06 .04 .01 .00 .00 .00 .00 .00 16 .05 .15 .11 .07 .07 .07 .01 .00 .00 .00 .00 .00 17 .05 .15 .11 .07 .06 .04 .01 .00 .00 .00 .00 .00 18 .05 .14 .11 .07 .06 .05 .01 .00 .00 .00 .00 .00 19 .05 .17 .10 .07 .06 .06 .01 .00 .00 .00 .00 .00 20 .04 .16 .11 .07 .06 .05 .01 .00 .00 .00 .00 .00 21 .04 .15 .10 .06 .06 .06 .01 .00 .00 .00 .00 .00 22 .06 .14 .09 .06 .06 .05 .01 .00 .00 .00 .00 .00 23 .05 .14 .09 .06 .05 .05 .00 .00 .00 .00 .00 .00 24 .04 .14 .09 .06 .06 .05 .00 .00 .00 .00 .00 .00 25 .04 .14 .08 .07 .04 .05 .00 .00 .00 .00 .00 .00 26 .03 .15 .10 .05 .04 .05 .00 .00 .00 .00 .00 .00 27 .03 .13 .09 .05 .04 .05 .04 .00 .00 .00 .00 .00 28 .02 .13 .09 .05 .05 .05 .08 .00 .00 .00 .00 .00 29 .03 .13 .08 .05 .04 .05 .04 .00 .00 .00 .00 .00 30 .04 .13 .08 .05 --- .05 .04 .00 .00 .00 .00 .00 31 .04 --- .08 .06 .05 --- .00 --- .00 .00 --- TOTAL 1.69 4.60 3.40 2.20 1.76 1.44 .72 .20 .02 .00 .00 .00 MEAN .055 .15 .11 .071 .061 .046 .024 .006 .001 .000 .000 .000 MAX .08 .81 .15 .11 .10 .07 .08 .03 .02 .00 .00 .00 MIN .02 .03 .08 .05 .04 .03 .00 .00 .00 .00 .00 .00 CFSM .03 .07 .05 .03 .03 .02 .01 .003 .000 .000 .000 .000 IN. .03 .08 .06 .04 .03 .03 .01 .00 .00 .00 .00 .00 AC-FT 3.4 9.1 6.7 4.4 3.5 2.9 1.4 .4 .04 .00 .00 .00 CAL YR 1983 TOTAL 39.62 MEAN .11 MAX .81 MIN .00 CfSM .05 IN .70 AC-FT 79 NTR YR 1984 TOTAL 16.03 MEAN .044 MAX .81 MIN .00 CFSM .02 IN .28 AC-FT 32 345 ST. CROIX, U.S. VIRGIN ISLANDS 50345000 JOLLY HILL GUT AT JOLLY HILL, ST. CROIX, VI--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--MARCM 1983 TO CURRENT YEAR MATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 19841 STREAmFLOw, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DuCTANCE TuRE DATE TIME INSTANTANEOUS DUCTANCE TURF (CFS) (UMMOS) (OEG C) (CFS) (UMMOS) (DEG C) OCT, 25 1113 .05 1133 25.5 FEB, 27 1209 .04 1030 24.5 DEC, 06 1324 .14 1036 24.5 APR, 02 1121 .06 1030 25.0 JAN, 26 1435 .06 9890 24.0 MAY, 14 1226 .00 1030 27.5 Ground-Water Records for U.S. Virgin Islands 348 O 1 2 3 MILES O 1 2 3 4 KILOMETERS 0 2 3 MILES 1 0 1 2 3 4 KILOMETERS O 1 2 3 MILES I I H I I O 1 2 3 4 KILOMETERS Figure 27.--Location of ground-water stations in the U.S. Virgin Islands. 349 GROUND-WATER LEVELS ST. CROIX, U.S. VIRGIN ISLANDS 174225064471900. Local number, 1. LOCATION.--Lat 17°42'25", long 64°47'19". Owner: Virgin Islands Government. Name: Fairplains 6 (FP6). AQUIFER.--Alluvium and marl. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). DATUM.--Altitude of land-surface datum is about 20 ft (6.10 m) above mean sea level. Measuring point: Top of pump concrete base, 2.20 ft (0.67 m) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.-- Water level: March 1982 to current year. Chemical analyses: June 20, 1983 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 15.64 ft (4.77 m) below land-surface datum, Mar. 25, 1982; lowest water level measured, a58.57 ft (17.9 m) below land-surface datum, June 20, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1981 TO SEPTEMBER 1983 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 25 a55.94 Feb. 27 27.91 May 14 18.10 July 24 a55.94 Dec. 6 a56.50 Apr. 2 26.92 June 25 a55.91 Aug. 22 a56.63 a Pumping. 350 GROUND-WATER LEVELS ST. CROIX, U.S. VIRGIN ISLANDS 174225064472000. Local number, 2. LOCATION.--Lat 17°42'25", long 64°47'20". Owner: U.S. Government, Virgin Islands Government. Name: USGS-10, Fairplains 2 (FP2). AQUIFER: Alluvium and marl. WELL CHARACTERISTICS: Drilled unused water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). DATUM: Altitude of land-surface datum is about 20 ft (6.10 m) above mean sea level. Measuring point: Top of 0.5 in (0.01 m) hole at concrete base wall, 3.00 ft (0.91 m) above land-surface datum. REMARKS.--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 8CLOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTA1EOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN FE9 MAR APR MAY JUN JUL AUG SEP 1 22.67 23.36 22.41 21.35 22.11 22.05 22.27 22.46 23.53 ?3.66 24.50 24.19 2 22.72 23.31 22.49 21.36 22.11 22.12 22.34 22.44 23.13 23.67 24.64 24.36 3 4 22.67 22.73 23.39 23.91 22.53 22.54 21.33 21.34 22.12 22.34 22.38 22.09 22.31 22.35 22.33 22..0 23.12 22.95 23.72 23.75 24.75 24.72 23.97 23.38 5 22.77 22.76 22.34 21.34 22.07 22.12 22.40 22.49 22.74 23.71 24.81 23.30 6 22.73 22.96 22.31 21.37 22.06 22.13 22.44 22.44 22.72 23.72 24.82 23.68 7 22.65 22.81 22.31 21.38 22.12 22.20 22.43 22.44 22.72 23.69 24.75 23.61 8 22.66 22.73 22.55 21.39 22.09 23.24 22.47 22.49 22.65 23.58 24.80 23.55 9 22.76 22.71 22.14 21.39 22.07 22.26 22.59 22.49 22.61 23.66 24.61 23.46 10 22.71 22.67 22.0o 21.39 22.35 22.20 22.45 22.55 22.61 23.32 24.75 23.40 11 22.79 22.77 21.97 21.39 22.05 22.29 22.44 22.54 22.63 23.51 24.85 23.32 12 23.03 22.63 21.94 21.90 22.19 22.34 22.45 22.55 22.62 23.75 24.87 23.26 13 23.14 22.55 21.95 21.99 22.13 22.36 22.47 22.58 22.63 23.96 24.91 23.22 14 23.22 22.57 21.91 22.04 22.13 22.36 22.52 22.56 22.60 24.06 24.72 23.21 15 23.03 22.72 21.94 22.03 22.15 22.37 22.53 22.58 22.62 24.15 24.75 23.18 16 23.05 22.72 21.93 22.37 22.15 22.32 22.45 22.39 22.64 24.06 24.73 23.15 17 23.03 22.61 21.94 22.02 22.05 22.32 22.44 23.12 22.63 24.09 24.74 23.12 18 23.07 22.55 21.94 21.98 22.07 22.30 22.51 22.99 22.64 24.28 24.73 23.12 19 23.20 22.29 21.89 22.01 22.05 22.28 22.56 23.23 22.58 24.37 24.73 23.08 20 23.11 22.19 21.91 22.02 22.07 22.25 22.56 23.24 23.05 24.43 24.77 23.02 21 23.19 22.16 21.89 22.01 22.09 22.24 22.51 23.36 23.24 24.48 24.91 22.96 22 23.25 22.11 21.93 22.00 22.04 22.24 22.47 23.35 23.30 24.52 25.00 22.88 23 23.25 22.35 21.94 22.32 21.45 22.21 22.47 23.44 23.42 24.56 24.98 22.89 24 23.27 22.01 21.94 22.03 21.93 22.28 22.47 23.48 23.52 24.55 24.77 22.38 25 23.25 21.99 21.90 22.33 22.01 22.32 22.49 23.48 23.61 24.64 24.76 22.86 26 23.26 22.00 21.90 22.36 22.04 22.26 22.46 23.49 23.65 24.68 24.59 22.32 27 23.22 21.89 21.83 22.03 22.06 22.31 22.43 23.50 23.69 24.71 24.54 22.79 28 23.22 21.85 21.90 22.07 22.04 22.26 22.48 23.53 23.69 24.73 24.79 22.41 29 23.25 22.31 21.87 22.08 22.07 22.29 22.4o 23.48 23.75 24.52 24.86 22.31 30 23.15 22.32 21.86 22.09 --- 22.28 22.47 23.55 23.68 24.32 24.90 22.76 31 23.32 --- 21.87 22.10 22.35 --- 23.58 --- 24.32 24.40 --- LOW 23.32 23.39 22.55 22.10 22.19 22.37 22.56 23.58 23.75 24.73 25.00 24.19 HIGH 22.65 21.85 21.86 21.83 21.93 22.05 22.31 22.38 22.53 23.51 24.40 22.76 WTR YR 1984 MEAN 22.88 LOW 25.00 HIGH 21.33 21 Li 0 D M 22 CD I-4( Lai CZ 1.41 L.-Z4 23 -J D > LI I -J Z < 24 25 JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1983 1984 351 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.--Altitude of land-surface datum is about 40 ft (12.2 m) above mean sea level. 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, March 25, 1982; lowest water level measured, 27.91 ft (8.51 m) below land-surface datum, Sept. 30, 1984. WATER LEVEL, /N FEET IELOU LAND-SURFACE OATUM, MATER YEAR OCTOBER 1983 TO SEPTEMEER 1984 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV JEC JAN FE8 "SAP APR MAY JUN JUL AUG SEP 1 24.99 25.54 23.71 24.96 25.63 25.92 16.17 26.47 26.73 27.35 27.4J 77.67 2 25.02 25.55 23.75 24.09 25.63 25.93 26.20 26.48 25.71 27.37 27.41 27.68 3 25.04 25.57 23.79 25.02 25.69 25.94 26.23 26.49 26.69 27.10 27.41 27.69 4 25.06 25.58 23.84 22.35 e5.73 25.95 26.29 26.49 26.69 27.11 27.43 27.70 5 25.03 25.24 23.87 25.38 25.72 25.96 26.21 26.50 26.70 27.13 27.43 27.71 6 25.10 24.11 23.95 25.11 25.73 25.97 26.21 26.51 26.71 27.14 27.43 27.72 7 25.13 23.40 23.99 25.14 25.73 25.95 26.22 26.52 26.73 27.15 27.44 27.72 9 25.15 23.07 24.04 25.18 25.74 25.99 26.22 26.53 26.74 27.16 27.45 27.73 9 25.17 22.56 24.08 25.20 15.75 25.00 26.23 25.54 26.75 27.17 27.45 27.73 10 25.19 22.76 24.12 25.23 25.76 26.01 26.23 26.54 26.75 27.18 27.46 27.74 11 25.21 22.71 24.16 25.25 25.77 26.92 76.24 26.55 26.77 27.19 27.47 27.75 12 25.24 22.70 24.20 25.28 25.77 26.04 26.25 26.56 26.79 27.20 27.43 27.75 13 25.26 22.71 24.24 25.31 25.75 26.05 26.26 26.56 26.79 27.21 27.49 27.76 14 25.23 22.75 24.29 25.34 25.30 25.06 26.27 26.57 26.80 27.22 27.50 27.77 15 25.30 22.80 24.34 25.36 25.81 26.07 26.23 26.57 26.82 27.23 27.50 27.78 16 25.32 22.34 24.30 25.38 25.81 26.0P 20.21 26.57 26.83 27.24 27.51 27.79 17 25.34 22.89 24.43 25.41 25.82 2o.09 26.30 26.58 26.84 27.27 27.52 27.80 18 25.36 22.94 24.47 25.44 25.83 26.10 26.31 26.58 26.86 27.27 27.53 27.31 19 25.37 23.00 24.50 25.46 25.84 26.11 26.32 26.59 26.87 27.29 27.54 27.32 20 25.39 23.06 24.55 25.48 25.85 25.12 26.33 26.60 26.55 27.30 27.54 27.32 21 25.43 23.12 24.59 25.51 25.85 26.13 26.34 25.61 26.89 27.31 27.55 27.33 22 25.41 23.17 24.63 25.53 25.86 26.14 26.36 26.61 26.91 27.32 27.56 27.83 23 25.43 23.23 24.66 25.55 25.87 26.14 26.37 26.52 26.92 27.33 27.57 27.34 24 25.44 23.29 24.70 25.57 25.38 26.15 26.33 26.63 26.94 27.33 27.53 27.85 25 25.45 23.37 24.74 25.59 25.87 25.15 26.3? 26.65 26.95 27.34 27.60 27.86 26 25.46 23.43 24.77 25.60 25.39 25.15 26.41 26.66 26.96 27.35 27.60 27.87 27 25.45 23.48 24.81 25.62 25.90 26.16 26.42 26.67 26.98 27.35 27.61 27.87 28 25.49 23.54 24.84 25.63 25.91 26.16 26.43 26.68 27.00 27.36 27.63 27.88 29 25.50 23.60 24.97 25.64 25.91 23.16 26.44 26.69 27.02 27.37 27.64 27.89 30 25.51 23.66 24.91 25.65 --- 23.17 26.45 26.70 27.03 27.38 27.65 27.90 31 25.52 --- 24.94 25.66 23.17 --- 26.71 --- 27.39 27.66 --- LOW 25.52 25.58 24.94 25.56 25.91 26.17 26.45 26.71 27.03 27.39 27.66 27.90 HIGH 24.99 22.70 23.71 24.96 25.68 25.92 26.17 26.47 26.69 27.05 27.40 27.67 WTR YR 1984 MEAN 26.06 LOW 27.90 HIGH 22.70 22 0 -J CO < 24 LI 0 Li Li 0 Zrit .CC -J D > Li --I 0 26 LJ z< 28 JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1983 1984 352 GROUND-WATER LEVELS ST. CROIX, U.S. VIRGIN ISLANDS 174245064475800. Local number, 4. LOCATION.--Lat 17°42'45", long 64°47'58". Owner: Virgin Islands Government. Name: Golden Grove - 1 (PW1). AQUIFER.--Alluvium and marl. WELL CHARACTERISTICS.--Drilled production water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m) 0-104 ft (0-31.70 m), perforated 64-104 ft (19.51-31.70 m). Depth 104 ft (31.70). DATUM.--Altitude of land-surface datum is about 40 ft (12.2 m) above mean sea level. Measuring point: lower edge of 1 in. (0.02 m) pipe at pump base, 3.40 ft (1.04 m) above land-surface datum. RENARKS.--Observation well. Lowest water level affected by pumping. PERIOD OF RECORD.-- Water level: January 1983 to current year. Chemical analyses: June 20, 1983 to current year. EXTREMES FOR PERIOD OF RECORD: Highest water level measured, 23.09 ft (7.04 m) below land-surface datum, May 18, 1983; lowest water level measured, a58.30 ft (17.77 m) below land-surface datum, September 27, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 25 a49.36 Feb. 27 26.64 May 14 28.46 July 24 a36.40 Dec. 6 26.38 Apr. 2 28.12 June 25 a58.30 Aug. 22 a32.47 Jan. 26 27.99 174336064523200. Local number, 5. LOCATION.--Lat 17°43'36", long 64°52'32". Owner: Virgin Islands Government. Name: Mahogany Road 3. AQIFER.--Alluvium of Quaternary age and volcanic rocks of Cretaceous age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m) 0-104 ft (0-31.70 0, perforated 64-104 ft (19.51-31.70 m). Depth 104 ft (31.70 m). DATUM.--Altitude of land-surface datum is 70 ft (21.3 m) above mean sea level. Measuring point: lower edge of 2 in. (0.05 m) pipe at pump base, 3.70 ft (1.13 m) above land-surface datum. Prior to December 1969, top of instrument platform, 2.57 ft (0.78 m) above land-surface datum. REMARKS.--Observation well. Water levels affected by nearby pumpage. PERIOD OF RECORD.--May 1964 to December 1969, discontinued. March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 26.24 ft (8.00 m) below land-surface datum, Dec. 16, 1969; lowest water level measured, 74.31 ft (22.6 m) below land-surface datum, Mar. 29, 1965. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 25 59.75 Jan. 26 65.69 Apr. 2 68.53 Aug. 22 69.45 Dec. 6 62.10 Feb. 27 63.32 a Pumping. 353 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. AQUIFER.--Alluvium of Pleistocene age and marl of Oligocene age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 4 in (0.10 m), cased 4 in (0.10 m). DATUM.--Altitude of land-surface datum is about 80 ft (24.39 m) above mean sea level. Measuring point: Upper edge of hole at 4 in (0.10 m) casing, 2.00 ft (0.61 m) above land-surface datum. Prior June 20, 1983, top of 4 in (0.10 m) casing, 0.90 ft (0.27 m) above land-surface datum. REMARKS.--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 SELOW LAND-SURFACE DATUM, WATER YEAR OCTO8ER 1983 T3 SEPTEm8ER 1984 INSTANTANEOUS OESERVATTONS AT 1200 DAY OCT NOV DEC JAN Ff5 MAR APR mAY JUN JUL AUG SEP 1 34.41 34.22 35.87 16.73 37.76 37.95 35.37 35.37 73.88 37.25 35.31 43.16 2 34.40 34.22 15.89 36.31 37.77 35.95 35.34 35.38 36.13 37.35 37.43 40.16 3 4 34.40 34.40 32.48 27.46 35.90 35.93 35.38 35.96 37.73 37.33 33.80 35.58 35.33 35.32 3 5.38 35.38 36.14 35.33 3 7.41 3".47 33.65 38.73 40.16 40.17 5 34.40 27.38 35.96 35.00 37.85 35.53 35.3J 35.40 16.34 35.98 38.91 40.17 6 7 34.43 34.40 31.39 33.56 35.96 35.00 37.36 35.43 37.03 37.90 35.48 35.43 35.30 35.33 35.42 35.43 6.06 36.05 37.55 37.59 39.02 39.14 33.99 43.15 8 9 34.41 34.42 33.40 33.65 36.09 36.22 37.19 34.76 37.72 37.73 15.34 35.27 35.29 35.23 35.45 35.47 36.06 36.05 37.63 36.60 30.23 30.32 40.17 40.17 10 34.45 3 1.76 36.31 3'.22 37.69 35.19 35.23 35.50 36.05 37.67 39.41 40.03 11 34.45 33.33 36.42 37.32 37.75 35.13 35.23 35.52 32.63 37.71 39.49 39.93 12 13 34.43 34.48 34.51 34.09 36.4? 36.49 37.37 37.42 37.79 33.87 3). 06 35.30 35.23 35.23 35.55 35.56 35.9 36.17 37.75 37.73 39.56 39.62 38.93 33.93 14 15 34.49 34.50 34.94 35.14 36.48 36.41 37.45 37.48 37.91 37.95 35.95 35.91 35.2!! 35.23 35.58 35.53 36.25 36.23 37.31 37.33 39.70 39.76 33.93 33.93 16 34.54 35.33 36.34 37.50 37.97 35.36 35.23 15.59 36.23 37.56 39.82 38.93 17 18 19 34.50 34.43 34.46 35.47 35.61 35.70 36.24 36.17 36.16 37.52 37.55 17.57 37.97 37.92 37.50 35.82 35.76 35.70 35.23 35.29 35.29 35.60 35.62 35.64 36.23 34.84 36.20 37.83 37.91 36.94 39.37 39.93 39.93 38.93 36.65 39.64 20 33.55 35.74 36.15 3 7.59 37.85 35.68 35.29 35.65 36.22 37.97 40.03 39.70 21 34.31 35.77 36.15 37.60 17.95 35.65 35.31 35.70 36.23 37.99 40.07 39.56 22 34.36 35.77 36.17 77.61 38.0E 35.62 35.31 35.71 36.30 38.07 40.13 39.50 23 34.33 35.78 36.22 37.52 38.05 35.50 35.31 35.71 36.44 33.05 40.14 39.50 24 34.28 35.78 36.26 37.64 314 .08 35.57 35.33 35.77 36.57 33.09 40.14 39.50 25 34.29 15.78 36.31 37.66 38.08 35.53 35.33 35.93 36.69 38.11 40.14 39.53 26 34.27 35.81 36.36 37.57 37.76 35.47 35.35 36.10 36.78 33.14 40.14 39.56 27 34.27 35.81 36.40 17.54 37.64 35.46 35.35 36.18 36.80 33.15 40.15 39.58 2P 29 30 34.27 34.26 34.25 35.13 35.34 35.87 36.45 36.50 36.57 37.66 3 7.68 37.71 37.43 37.26 --- 35.43 35.42 35.41 35.35 35.35 35.36 36.21 36.21 36.21 36.84 37.03 37.17 38.17 38.19 33.21 40.15 40.15 40.16 39.60 39.63 39.65 31 34.22 --- 36.64 37.73 35.39 --- 35.21 --- 38.23 40.16 --- LOW HIGH 34.54 33.55 35.87 27.38 36.64 35.03 37.73 34.76 38.08 33.37 37.05 35.39 35.37 35.23 36.21 35.37 37.17 32.63 33.23 35.98 40.16 37.43 40.17 36.65 WTR YR 1934 MEAN 36.64 LOW 40.17 HIGH 27.38 26 3 0 0 30 mF 1- 4 L. 0 34 L > tr) Lai .1 0 Z < Q -J 38 42 JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1983 1984 354 GROUND-WATER LEVELS ST. CROIX, U.S. VIRGIN ISLANDS 174525064460600. Local number, 7. LOCATION.--Lat 17°45'25", long 64°46'06". Owner: Virgin Islands Government. Name: Concordia 14. AQUIFER.--Sand and gravel. WELL CHARACTERISTICS.--Drilled production water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Depth 85 ft (25.91 m). DATUM.--Altitude of land-surface datum is about 40 ft (12.2 m) above mean sea level. 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 level affected by pumpage. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 18.73 ft (5.71 m) below land-surface datum, June 25, 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 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 25 a39.16 Feb. 27 24.79 May 14 25.90 July 24 a35.20 Dec. 6 a32.68 Apr. 2 23.25 June 25 18.73 Aug. 22 a38.96 Jan. 27 23.87 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. Depth 82 ft (25.0 m). DATUM.--Altitude of land-surface datum is about 40 ft (12.2 m) above mean sea level. 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 level: March 1982 to current year. Chemical analyses: June 1983 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 19.97 ft (6.09 m) below land-surface datum, Mar. 25, 1982; lowest water level measured, a28.39 ft (8.66 m) below land-surface datum, Dec. 8, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1981 TO SEPTEMBER 1983 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 25 27.82 Feb. 27 24.29 May 14 25.34 July 24 a24.70 Dec. 6 21.71 Apr. 2 24.64 June 25 a26.89 Aug. 22 26.52 Jan. 27 23.43 a Pumping. GROUND-WATER LEVELS ST. CROIX, U.S. VIRGIN ISLANDS 174532064460300. Local number, 9. LOCATION.--Lat 17°45'32", long 64°46'03". Owner: Virgin Islands Government. Name: Concordia 7. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled production water-table well, diameter 6 in (0.15 m), cased 0-81 ft (0-24.7 m). Depth 81 ft (24.7 m). DATUM.--Altitude of land-surface datum is 35 ft (10.7 m) above mean sea level. Measuring point: Hole in pump base, 2.20 ft (0.67 m) above land-surface datum. Previous to Mar. 25, 1982, hole in pump base 2.50 ft (0.76 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD: Water levels: June 1962 to October 1968, discontinued. March 1982 to current year. Chemical analysis: October 1964 to October 1967, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 1.75 ft (0.53 m) below land-surface datum, May 11, 1966; lowest water level measured, 57.40 ft (17.5 m) below land-surface datum, Mar. 5, 1964. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1981 TO SEPTEMBER 1983 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 25 a43.37 Feb. 27 10.26 May 14 11.35 July 24 a21.82 Dec. 6 a27.79 Apr. 2 10.96 June 25 a28.34 Aug. 22 a20.48 Jan. 27 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 m). Depth 130 ft (39.63 m). DATUM.--Altitude of land-surface datum is about 75 ft (22.86 m) above mean sea level. Measuring point: Hole on top of pump base, 2.00 ft (0.61 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD: Water level: March 1982 to current year. Chemical analyses: June 22, 1983 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 61.86 ft (18.86 m) below land-surface datum, Mar. 26, 1982; lowest water level measured, a75.52 ft (23.02 m) below land-surface datum, Sept. 8, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1981 TO SEPTEMBER 1983 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 25 a70.50 Feb. 27 64.19 May 14 64.55 July 24 69.73 Dec. 6 64.29 Apr. 2 65.64 June 25 a68.93 Aug. 22 a73.77 Jan. 27 64.35 a Pumping. 355 GROUND-WATER LEVELS ST. THOMAS, U.S. VIRGIN ISLANDS 182050064580400. Local number, 1. LOCATION.--Lat 18°20'50", long 64°58'04". Owner: U.S. Government, Virgin Islands Government. Name: USGS-8 (Family well - Thatch Farm). AQUIFER.--Volcanic rocks of Cretaceous age. WELL CHARACTERISTICS.--Drilled water-table production well, diameter 6 in (0.15 m), cased 6 in (0.15 m) 0-25 ft (0-7.62 m), openhole 25-80 ft (7.62-24.4 m). Depth 80 ft (24.4 m). DATUM.--Altitude of land-surface datum is 80 ft (24.4 m) above mean sea level. Measuring point: Top of 6 in (0.15 m) casing, 2.50 ft (0.76 m) above land-surface datum. Prior to Mar. 23, 1982, top of 6 in (0.15 m) casing, 1.30 ft (0.40 m) above land-surface datum. REMARKS.--Non-potable public-water supply and observation well. PERIOD OF RECORD: Water levels: October 1963 to August 1969, discontinued. March 1982 to current year. Chemical analyses: December 1963, discontinued. June 30, 1983 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 5.29 ft (1.61 m) below land-surface datum, May 6, 1983; lowest water level measured, 56.44 ft (17.21 m) below land-surface datum, Aug. 24, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 26 26.34 Feb. 28 a32.73 May 23 a45.92 July 26 56.29 Nov. 30 26.07 Apr. 4 a43.45 June 29 a44.24 Aug. 24 56.44 Jan. 23 30.11 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 water-table production well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Depth 145 ft (44.21 m). DATUM.--Altitude of land-surface datum is 120 ft (36.6 m) above mean sea level. Measuring point: Top of 6 in (0.15 m) casing, 1.20 ft (0.36 m) below land-surface datum. REMARKS.--Potable water supply. Observation well. Water level affected by nearby pumping well. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 18.58 ft (5.66 m) below land-surface datum, July 20, 1983; lowest water level measured, 73.75 ft (22.48 m) below land-surface datum, July 26, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEARS OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Date Oct. 26 Nov. 30 Jan. 25 Water level 30.51 27.70 34.82 Date Feb. 28 Apr. 4 Water level 42.46 51.29 Date May 23 June 29 Water level 64.74 66.50 Date July 26 Aug. 24 Water level 73.65 69.68 182138064542500. Local number, 3. LOCATION.--Lat 18°21'38", long 64°54'25". Owner: Mahogany Run Resort. Name: Mahogany 16. AQUIFER.--Fractured rocks. WELL CHARACTERISTICS.--Drilled water-table production well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Depth 145 ft (44.21 m). DATUM.--Altitude of land-surface datum is 130 ft (39.6 m) above mean sea level. Measuring point: Top of 6 in (0.15 m) casing, 1.30 ft (0.40 m) below land-surface datum. REMARKS.--Water level affected by nearby pumping well. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 24.96 ft (7.61 m) below land-surface datum, Aug. 25, 1983; lowest water level measured, a68.20 ft (20.79 m) below land-surface datum, July 21, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 26 35.92 Feb. 28 45.30 May 23 53.03 July 26 55.75 Nov. 30 33.00 Apr. 4 48.67 June 29 50.05 Aug. 24 56.05 Jan. 25 38.73 a Pumping. 356 357 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.--Altitude of land-surface datum is 140 ft (42.7 m) above mean sea level. Measuring point: Top of 6 in (0.15 m) casing at land-surface datum. REMARKS.--Potable water supply. Water level affected by nearby pumping. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 25.60 ft (7.80 m) below land-surface datum, July 20, 1983; lowest water level measured, a60.40 ft (18.41 m) below land-surface datum, Sept. 10, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 26 36.70 Feb. 28 40.92 May 23 44.12 July 26 44.03 Nov. 30 33.80 Apr. 4 42.07 June 29 43.48 Aug. 24 44.00 Jan. 25 38.22 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), openhole 20-400 ft (6.10-122 m). Dept 400 ft (122 m). DATUM.--Altitude of land-surface datum is about 235 ft (71.6 m) above mean sea level. 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 current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 71.44 ft (21.78 m) below land-surface datum, July 1, 1983; 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 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 26 83.38 Feb. 28 78.04 May 23 85.63 July 26 86.63 Nov. 29 72.90 Apr. 4 81.58 June 29 85.04 Aug. 24 86.68 Jan. 25 78.10 a Pumping. 358 GROUND-WATER LEVELS ST. THOMAS, U.S. VIRGIN OSLANDS 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 (21.33 m). DATUM.--Altitude of land-surface datum is 60 ft (18.3 m) above mean sea level. 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 measured, 10.56 ft (3.22 m) below land-surface datum, July 9, 1983; lowest water level measured, 35.38 ft (10.79 m) below land-surface datum, July 21, 1982. WATER LEVEL, IN CET LAND-SURFACE DATUM, WATER YEAR OCTOBER 1933 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN 1.E9 MAR APR MAY JUN JUL AUG SEP 1 22.03 23.97 22.05 27.55 24.51 25.31 25.08 25.65 26.49 24.25 23.45 25.22 2 22.13 24.03 22.10 27.59 24.56 25.30 25.24 25.88 25.37 24.44 23.17 24.56 3 22.23 24.38 20.97 23.79 24.79 25.28 25.53 26.00 26.13 24.60 22.71 24.23 4 22.42 24.00 10.5? 23.70 24.87 25.24 25.64 25.99 25.96 24.63 22.67 24.57 5 22.54 21.17 19.09 24.00 24.91 25.18 25.63 25.72 25.75 24.62 22.20 25.01 6 22.64 15.82 19.43 24.02 24.91 25.12 25.74 25.93 24.97 24.58 21.74 25.24 7 22.73 17.53 1 0.85 24.37 24.92 25.07 25.79 25.33 23.09 24.51 21.59 25.16 8 22.82 16.71 20.24 24.15 24.94 25.04 25.87 25.74 21.56 24.45 21.80 25.05 9 22.91 16.09 20.55 24.25 24.95 24.97 25.90 25.77 20.38 24.54 22.12 25.00 10 23.01 17.15 20.33 24.35 24.65 24.35 25.84 25.34 20.65 24.37 22.47 24.97 11 23.12 17.33 21.15 24.41 24.79 24.70 25.87 25.90 20.67 25.25 22.71 24.72 12 23.23 17.23 21.45 24.43 24.30 24.56 25.81 25.98 21.13 25.52 22.95 24.27 13 27.10 17.56 21.72 24.46 24.81 24.34 25.70 25.96 21.56 25.58 23.19 23.78 14 23.35 17.77 21.93 24.44 24.78 24.04 25.55 26.06 21.78 25.51 23.34 23.48 15 23.41 13.44 22.12 24.34 24.77 23.76 25.42 26.18 21.92 25.43 23.48 23.25 16 23.42 13.34 22.29 24.26 24.72 23.53 25.26 26.15 22.10 25.37 23.59 23.12 17 23.42 19.20 22.41 24.20 24.54 23.32 25.11 26.06 22.23 25.34 23.63 23.16 18 23.44 19.53 22.53 24.13 24.67 23.12 25.19 25.07 22.21 25.32 23.80 22.58 19 23.43 19.84 22.70 24.09 24.92 22.97 25.31 25.89 22.04 25.30 23.93 21.49 20 23.53 23.13 22./0 24.07 24.87 22.70 25.35 25.37 21.89 25.26 24.05 20.81 21 23.57 20.46 23.04 24.05 24.90 22.40 25.51 25.86 21.92 25.13 24.23 20.50 22 23.59 20.76 23.09 23.99 24.93 22.38 25.77 25.85 22.06 25.11 24.36 20.47 23 23.65 20.9F 23.15 23.02 24.99 22.44 25.97 25.54 22.34 25.04 24.25 20.72 24 23.72 21.17 23.22 23.03 25.01 22.70 26.05 25.30 22.76 25.00 24.07 21.00 25 23.73 21.34 23.33 23.99 25.04 23.29 26.09 25.79 23.28 24.99 24.01 21.30 26 23.84 21.47 23.49 24.07 25.09 23.38 26.12 25.78 23.65 25.04 24.04 21.61 27 23.92 21.52 23.60 24.15 25.15 24.41 26.03 25.96 23.83 24.99 24.08 21.89 28 23.97 21.73 23.59 24.24 25.22 24.75 25.52 26.27 23.94 24.89 24.19 22.25 29 24.01 21.81 23.60 24.32 25.29 24.86 25.12 26.53 24.07 24.49 24.53 22.63 30 24.02 21.90 23.64 24.45 --- 24.90 25.39 26.63 24.18 23.88 25.14 22.71 31 23.97 --- 23.65 24.55 24.96 --- 26.61 --- 23.58 25.37 --- LOW 24.02 24.08 23.65 24.55 25.29 25.31 26.12 26.53 26.49 25.58 25.37 25.24 HIGH 22.08 16.91 19.09 23.55 24.61 22.38 25.08 25.68 20.65 23.58 21.59 20.47 WTR YR 1984 MEAN 23.73 LOW 26.63 HIGH 15.91 10 3 Lan 1-WO4 16 U Z .ce > La I JO 22 28 JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1983 1984 359 GROUND-WATER LEVELS ST. JOHN, U.S. VIRGIN ISLANDS 182010064472600. Local number, 1. LOCATION.--Lat 18°20'10", long 64°47'26". Owner: U.S. Government, National Park Services. Name: NPS-2 (Cruz Bay). AQUIFER: Volcanic rocks of Cretaceous Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), 4 in (0.10 m), cased, 0-20 ft (0-6.10 m), open hole 20-99 ft (6.10-30.2 m). Depth 99 ft (30.2 m). DATUM: Altitude of land-surface datum is 60 ft (18.3 m) above mean sea level. Measuring point: Top of 4 in (0.10 m) casing, 4.10 ft (1.25 m) above old land-surface datum after 1.4 ft (0.43 m) land fill and 2.7 ft (0.82 m) casing extension occurred. Prior to June 29, 1983, top of 4 in (0.10 m) casing, 1.4 ft (0.43 m) above land-surface datum. REMARKS.--Observation well. Lowest water level 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 current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 5.39 ft (1.64 m) below land-surface datum, Aug. 24, 1983; lowest water level measured, 42.56 ft (12.98 m) below land-surface datum, Aug. 30, 1967. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 27 30.69 Feb. 29 27.07 May 15 33.50 July 25 33.24 Nov. 30 25.99 Apr. 3 27.42 June 27 27.74 Aug. 25 17.53 Jan. 24 23.74 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 m). Depth 60 ft (18.3 m). DATUM.--Altitude of land-surface datum is 60 ft (18.3 m) above mean sea level. Measuring point: Top of 6 in (0.15 m) casing, 0.70 ft (0.21 m) above land-surface datum. Prior to Mar. 24, 1982 top of 6 in (0.15 m) casing, 1.00 ft (0.30 m) above land-surface datum. REMARKS.--Active water supply well for recreation facilities at Trunk Bay. PERIOD OF RECORD: 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 current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 16.76 ft (5.11 m) below land-surface datum, June 3, 1969; lowest water level measured, a57.29 ft (17.47 m) below land-surface datum, Nov. 27, 1968. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 27 28.34 Feb. 29 30.96 May 15 a46.48 July 25 a48.34 Nov. 30 26.76 Apr. 3 37.84 June 27 a42.76 Aug. 25 35.75 Jan. 24 35.27 a Pumping. 360 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.--Altitude of land-surface datum is 60 ft (18.3 m) above mean sea level. 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 EF ,ET LANO-SUREACE '?ATOM, MATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS AT 1200 DAY OCT NOV DEC JAN 5E2 MAR APR MAY JUN JUL AUG SEP 1 56.45 56.55 55.49 55.09 56.43 55. 75 56.84 56.80 57.14 57.61 57.92 57.88 2 56.45 55.54 55.54 55.02 56.44 55. 76 56.73 505.79 57. .7113 57.64 57.91 57.39 3 56.45 56.53 55.57 56.05 56.45 53. 73 56.71 57.08 57.90 57.91 4 56.44 56.43 55.62 56.35 56.46 56.67 56.67 56.81 57.09 57.57 57.89 57.91 5 56.41 55.04 55.6' 55.04 56.45 55.44 56.65 56.34 57.05 57.67 57.81 57.93 6 56.43 55.55 55.70 55.10 56.47 53.53 56.65 55.33 57.0J 57.65 57.73 57.93 7 56.40 54.73 55.74 55.33 36.53 56.63 56.67 55.95 56.76 57.63 57.66 57.93 8 56.43 5...25 55.75 55.05 56.52 55.65 56.72 56.99 56.95 57.64 57.60 57.93 9 56.41 53.94 55.79 55.99 56.53 56.59 56.77 57.02 58.95 57.69 57.56 57.15 10 56.44 53.79 55.81 55.1: 56.45 55.74 56.83 57.06 56.95 57.71 57.54 57.94 11 56.47 53.74 55.51 55.15 56.46 55.'6 56.31 57.33 56.96 57.74 57.54 57.39 12 56.41 53.76 55.82 55.18 56.44 55.78 56.81 57.10 57.00 57.74 57.54 57.79 13 56.53 53.34 55.84 55.21 56.43 55.76 56.31 57.11 57.04 57.75 57.56 57.72 14 56.55 53.97 55.87 55.24 56.43 55.74 56.79 57.13 57.03 57.77 57.59 57.68 15 56.55 54.09 55.E9 56.26 56.43 55. 73 56.77 57.15 57.13 57.78 57.62 57.65 16 56.55 54.22 55.91 55.27 56.44 51.73 56.77 57.18 57.15 57.78 57.64 57.64 17 56.56 54.33 55.94 55.26 56.45 55.71 56.77 57.20 57.19 57.81 57.65 57.63 18 56.55 54.45 55.96 55.25 56.47 55.66 56.79 57.22 57.24 57.53 57.63 57.61 19 56.55 54.58 55.99 55.24 56.49 55.62 56.83 57.24 57.26 57.36 57.71 57.60 20 56.55 54.69 56.02 55.25 56.5) 53.58 56.85 57.25 57.29 57.36 57.75 57.60 21 56.57 54.80 56.05 55.26 56.53 55.57 56.89 57.21 57.32 57.89 57.82 57.58 22 56.53 54.92 56.03 55.27 56.56 55.57 56.92 57.17 57.33 57.38 57.87 57.57 23 56.60 55.31 56.00 55.29 56.59 55.51 56.95 57.15 57.34 57.88 57.86 57.56 24 56.61 55.09 56.09 56.28 56.62 55.65 56.97 57.14 57.36 57.88 57.81 57.56 25 56.59 55.18 56.09 55.28 56.64 55.70 56.93 57.14 57.40 57.89 57.79 57.56 26 56.55 55.26 56.03 55.27 56.67 55.74 56.98 57.14 57.46 57.90 57.80 57.57 27 56.53 55.33 56.07 56.26 56.69 56.77 56.96 57.14 57.51 57.91 57.81 57.58 28 56.55 55.39 56.03 56.27 56.72 56.10 56.91 57.14 57.54 57.90 57.80 57.61 29 56.57 55.44 56.00 56.31 56.74 55.52 56.85 57.14 57.57 57.91 57.80 57.63 30 56.59 55.47 55.98 55.34 --- 55.83 56.83 57.15 57.59 57.91 57.83 57.63 31 56.57 --- 55.93 56.39 56.14 --- 57.17 --- 57.91 57.86 --- LOW 56.61 56.55 56.09 56.39 56.74 56.94 56.93 57.25 57.59 57.91 57.92 57.95 NIGH 56.40 53.74 55.49 55.99 56.43 56.57 56.65 56.79 56.95 57.61 57.54 57.56 WTR YR 1984 MEAN 56.76 LOW 57.95 NIGH 53.74 53 30 54 Lal CO p- < W 0 Ld Li 55 0 Z - I Lai > (/) 56 L.J - 1 0 Lai Z< i-a 57 3 58 JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1983 1984 361 GROUND-WATER LEVELS ST. JOHN, U.S. VIRGIN ISLANDS 181951064422100. Local number, 4. LOCATION.--Lat 18°19'51", long 64°42'21". Owner: U.S. Government, Virgin Islands Government. Name: USGS-15 (Calabash Boom). AQUIFER.--Volcanic rocks of Cretaceous age. WELL CHARACTERISTICS.--Drilled unused water-table well diameter 6 in (0.15 m), cased 0-61 ft (0-18.6 m), slotted 40-61 (12.2-18.6 m). Depth 62 ft (18.9 m). DATUM: Altitude of land-surface datum is 50 ft (15.2 m) above mean sea level. Measuring point: Top of 6 in (0.15 m) casing, 1.10 ft (0.34 m) above land-surface datum. Previous to March 1982, top of 6 in. (0.15 m) casing, 1.40 ft (0.43 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD: Water levels: September 1964 to December 1967, discontinued. March 1982 to current year. Chemical analyses: September 22, 1964, discontinued. June 30, 1983 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured 39.55 ft (12.06 m) below land-surface datum, May 25, 1982; lowest water level measured, 44.55 ft (13.58 m) below land-surface datum, Mar. 22, 1965. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEARS OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Date level Date level Jan. 24 41.79 June 27 43.08 362 GROUND-WATER LEVELS ST. JOHN, U.S. VIRGIN ISLANDS 182042064454500. Local number, 5. LOCATION.--Lat 18°20'42", long 64°45'45". Owner: Virgin Islands Government. Name: DPW-6. 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.--Altitude of land-surface datum is about 640 ft (195 m) above mean sea level. 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 measured, 11.34 ft (3.46 m) below land-surface datum, Apr. 27, 1983; lowest water level measured, 21.88 ft (6.67 m) below land-surface datum, Sept. 30, 1984. WATER LEVEL, IN FEET .1ELCW LAND-SURFACE DATUM, WATER YEAR CCTOBER 1933 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS AT 1200 CAY OCT NOV DEC JAN FEE MAR APR MAY JUN JUL AUG SEP 1S.t7 14.07 15.45 lto.31 17.51 19.07 20.33 20.69 20.81 21.42 21.67 2 13.56 14.03 15.47 16.35 1'8 19.11 20.07 20.71 23.84 21.43 21.69 3 13.71 1 7.53 1^-.4 9 16.40 17.74 19.14 20.38 20.71 20.16 21.45 21.70 4 14.36 13.72 15.51 16.44 1 7.75 19.17 20.10 20.73 23.87 21.47 21.72 5 11.84 13.33 13.53 15.49 17.82 19.21 20.13 20.74 20.39 21.47 21.73 6 12.06 13.97 15.55 16.53 17.39 19.25 20.16 20.74 20.90 21.40 21.73 7 12.06 14.11 15.58 16.57 1 7.95 19.21 23.18 20.75 20.92 21.36 21.75 8 12.36 14.26 15.50 16.51 13.01 19.31 20.21 20.72 20.94 21.34 21.76 9 12.92 14.40 15.4? 16.66 13.35 19.34 20.23 20.69 20.96 21.34 21.77 10 12.57 14.54 13.64 16.70 13.11 19.37 20.26 20.66 20.97 21.35 21.77 11 12.33 14.62 15.55 16.74 13.17 19.41 20.28 20.64 20.99 21.17 21.73 12 12.81 14.74 15.67 16.71 13.22 19.45 23.29 20.63 21.01 21.39 21.79 13 12.77 14.85 1.69 16.83 13.28 19.49 20.31 20.63 21.04 21.42 21.79 14 12.79 14.97 15.71 16.89 13.32 19.52 20.34 20.63 21.06 21.44 21.79 15 12.31 15.05 15.73 16.92 11.35 19.57 20.38 20.63 21.09 21.47 21.79 16 18.32 12.31 15.12 15.'6 16.96 13.39 19.61 20.38 20.63 21.12 21.43 21.80 17 18.02 12.63 15.14 15.79 17.01 13.40 19.64 20.33 20.63 21.13 21.50 21.80 18 18.03 12.57 15.1? 15.30 17.05 13.42 19.67 23.41 20.63 21.15 21.51 21.80 19 18.03 12.91 15.19 1 5.92 17.09 13.44 19.69 20.45 20.63 21.17 21.53 21.75 20 18.12 12.91 15.21 15.34 17.14 13.45 19.72 20.47 20.64 21.19 21.56 21.74 21 18.12 12.94 15.23 15.36 17.19 11.43 19.75 23.49 20.66 21.21 21.57 21.73 22 18.17 12.99 15.25 15.88 17.22 13.59 19.79 20.51 20.69 21.23 21.58 21.73 23 18.23 13.07 15.27 15.70 17.27 13.73 19.82 20.53 20.70 21.26 21.53 21.74 24 18.25 13.19 15.29 15.46 17.31 19.78 19.87 20.55 20.73 21.28 21.60 21.77 25 18.34 13.37 15.31 15.00 17.35 13.81 19.89 20.57 20.76 21.30 21.61 21.80 26 18.35 13.49 15.33 13.05 17.40 13.36 19.91 20.59 20.77 21.30 21.61 21.32 27 18.43 13.64 15.35 16.19 17.44 11.90 19.93 20.61 20.79 21.32 21.61 21.32 28 18.46 13.30 15.37 15.13 17.49 13.93 19.95 20.53 20.77 21.33 21.62 21.84 29 18.51 13.95 15.39 16.18 17.55 13.96 19.98 20.65 20.77 21.35 21.64 21.85 30 18.54 14.37 15.41 15.22 --- 14.01 20.00 23.66 20.80 21.37 21.65 21.57 31 18.58 --- 15.43 15.27 19.03 --- 20.68 --- 21.41 21.66 --- LOW 13.71 15.43 16.27 17.56 14.03 20.03 20.68 20.80 21.41 21.66 21.97 HIGH 11.34 13.68 15.45 16.31 17.61 19.07 20.03 20.63 20.81 21.34 21.67 10 3 0 13 Fa L.1 La Z 16 --I :3 Li > vl t.LJ I -J C1 Z Lai < 19 < 22 JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1983 1984 363 GROUND-WATER LEVELS ST. JOHN, U.S. VIRGIN ISLANDS 182044064454600. Local number, 6. LOCATION.--Lat 18°20'44", long 64°45'46". Owner: Virgin Islands Government. Name: DPW-5. AQUIFER.--Louisenhoj Formation. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Sounded depth 145 ft (44.2 m). DATUM.--Altitude of land-surface datum is about 640 ft (195 m) above mean sea level. Measuring point: Top of 6 in (0.15 m) casing, 1.40 ft (0.43 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD: Water levels: September 1982 to current year. Chemical analyses: June 30, 1983 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 36.71 ft (11.19 m) below land-surface datum, Sept. 9, 1983; lowest water level measured, a104.96 ft (32.0 m) below land-surface datum, May 19, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 27 a87.34 Feb. 29 69.70 May 15 43.48 July 25 44.29 Nov. 30 45.59 Apr. 3 42.82 June 27 43.69 Aug. 25 45.90 Jan. 24 41.76 182044064454800. Local number, 7. LOCATION.--Lat 18°20'44, long 64°45'48". Owner: Virgin Islands Government. Name: DPW-4 AQUIFER.--Louisenhoj Formation. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Sounded depth 60 ft (18.3 m). DATUM: Altitude of land-surface datum is about 640 ft (195 m) above mean sea level. Measuring point: Top of 6 in (0.15 m) casing, 0.60 ft (0.18 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 25.36 ft (7.73 m) below land-surface datum, Sept. 9, 1982; 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 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 27 43.87 Feb. 29 45.44 May 15 32.54 July 25 33.15 Nov. 30 34.80 Apr. 3 32.00 June 27 32.59 Aug. 25 34.52 Jan. 24 31.15 182044064454900. Local number, 8. LOCATION.--Lat 18°20'44", long 64°45'49". Owner: Virgin Islands Government. Name: DPW-3. AQUIFER.--Louisenhoj Formation. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Sounded depth 110 ft (33.5 m). DATUM.--Altitude of land-surface datum is about 640 ft (195 m) above mean sea level. Measuring point: Top of 6 in (0.15 m) casing, 1.80 ft (0.55 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 20.93 ft (6.38 m) below land-surface datum, Sept. 9, 1982; lowest water level measured, a69.08 ft (21.06 m) below land-surface datum, Dec. 9, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 27 48.58 Feb. 29 26.20 May 15 27.98 July 25 28.52 Nov. 30 30.15 Apr. 3 29.38 June 27 27.98 Aug. 25 29.81 Jan. 24 26.66 a Pumping. 364 GROUND-WATER LEVELS ST. JOHN, U.S. VIRGIN ISLANDS 182044064455000. Local number, 9. LOCATION.--Lat 18°20'44", long 64°45'50". Owner: Virgin Islands Government. Name: DPW-2. AQUIFER.--Louisenhoj Formation. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Sounded depth 65 ft (19.8 m). DATUM.--Altitude of land-surface datum is about 640 ft (195 m) above mean sea level. Measuring point: Top of 6 in (0.15 m) casing, 2.00 ft (0.61 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 32.84 ft (10.01 m) below land-surface datum, Sept. 9, 1982; lowest water level measured, 52.44 ft (15.99 m) below land-surface datum, May 19, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 27 Nov. 30 Jan. 24 51.03 39.39 37.33 Feb. 29 Apr. 3 37.72 41.29 May 15 June 27 38.94 38.66 July 25 Aug. 25 39.21 40.30 182044064455200. Local number, 10. LOCATION.--Lat 18°20'44", long 64°45'52". Owner: Virgin Islands Government. Name: DPW-1. AQUIFER.--Louisenhoj Formation. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Sounded depth 60 ft (18.3 m). DATUM.--Altitude of land-surface datum is about 640 ft (195 m) above mean sea level. Measuring point: Top of 6 in (0.15 m) casing, 2.00 ft (0.61 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 32.03 ft (9.76 m) below land-surface datum, Sept. 9, 1983; lowest water level measured, a37.60 ft (a11.46 m) below land-surface datum, Dec. 9, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS Water Water Date level Date level Water Water Date level Date level July 25 35.27 Oct. 27 36.59 Feb. 29 33.69 May 15 35.10 Nov. 30 35.62 Apr. 3 36.83 June 27 34.90 Aug. 25 36.18 Jan. 24 33.93 a Pumping. 365 GROUND-WATER LEVELS ST. JOHN, U.S. VIRGIN ISLANDS 181956064464500. Local number, 11. LOCATION.--Lat 18°19'56", long 64°46'45". Owner: Virgin Islands Government. Name: Guinea Gut Well. AQUIFER.--Louisenhoj Formation (Donnelly, 1959). WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Depth 85 ft (25.9 m). DATUM.--Altitude of land-surface datum is about 280 ft (85.36 m) above mean sea level. 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 current year. 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 measured, 20.05 ft (6.11 m) below land-surface datum, Sept. 11, 1984. WATER LEVEL. IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 INSTANTANEOUS OBSERVATIONS AT 1230 DAY OCT NOV OEC JAN FES MAR APR MAY JUN JUL AUG SEP 1 8.31 11.23 6.39 6.92 8.03 9.52 12.35 15.34 17.45 17.79 19.72 19.77 2 3 8.43 8.52 11.34 11.45 6.03 5.80 6.95 7.31 8.09 8.12 /.62 9.70 12.46 12.62 15.40 15.47 17.51 17.56 17.86 17.92 19.75 19.78 19.31 19.35 4 8.31 8.10 5.92 7.03 8.23 0.77 12.71 15.55 17.60 1 7.98 19.70 19.88 5 8.43 5.41 6.01 7.10 8.34 9.38 12.83 15.63 17.54 18.05 19.44 19.41 6 8.57 5.08 6.05 7.24 8.35 9.99 12.95 15.70 16.98 19.12 19.25 19.92 7 8.68 4.94 6.09 7.39 8.36 13.13 13.07 15.79 16.55 18.19 19.13 19.94 8 8.79 4.98 6.16 7.46 8.34 10.25 13.19 15.37 16.42 18.26 19.06 19.98 9 8.91 4.99 6.24 7.53 8.33 13.37 13.27 15.95 16.36 13.33 19.03 20.01 10 9.02 5.01 6.30 7.50 8.11 10.48 13.33 16.04 16.36 13.40 19.02 20.00 11 9.07 5.03 6.31 7.39 8.15 10.59 13.49 16.13 16.37 13.47 19.04 20.01 12 13 9.21 9.30 5.04 5.05 6.31 6.41 7.26 7.31 8.22 8.22 1).69 10.81 13.61 13.72 16.21 16.27 16.42 16.47 18.51 18.57 19.07 19.11 20.02 19.96 14 9.39 5.09 6.50 7.23 8.22 13.91 13.82 16.34 16.53 18.63 19.17 19.97 15 9.49 5.15 6.56 7.19 8.19 1).99 13.93 16.33 16.60 13.69 19.21 19.93 16 9.52 5.19 6.56 6.95 8.12 11.07 14.05 16.39 16.67 18.75 19.26 19.95 17 9.60 5.22 6.60 5.91 8.23 11.10 14.17 16.47 16.73 18.81 19.31 19.99 18 9.74 5.27 6.53 6.94 8.34 11.15 14.27 16.55 16.80 18.88 19.38 19.83 19 9.77 5.34 6.62 7.02 8.46 11.25 14.39 16.62 16.87 18.94 19.44 19.66 20 9.37 5.36 6.69 7.12 3.54 11.19 14.47 16.70 16.94 19.00 19.52 19.61 21 10.00 5.44 6.75 7.25 8.63 11.27 14.57 16.77 17.00 19.06 19.60 19.60 22 10.04 5.49 6.79 7.29 8.74 11.37 14.64 16.85 17.07 19.12 19.67 19.64 23 10.20 5.53 6.31 7.41 8.84 11.46 14.75 16.91 17.15 19.18 19.55 --- 24 10.35 5.60 6.85 '.49 8.93 11.56 14.86 16.97 17.23 19.24 19.48 25 10.45 5.75 6.92 7.54 9.00 11.66 14.95 17.03 17.33 19.29 19.50 26 10.57 5.88 7.00 7.62 9.11 11.77 15.05 17.08 17.43 19.40 19.52 27 10.73 6.04 6.91 7.66 9.24 11.85 15.13 17.14 17.55 19.46 19.55 28 10.86 6.21 6.96 7.71 9.35 11.95 15.16 17.20 17.62 19.52 19.61 29 10.94 6.31 7.00 7.79 9.43 12.04 15.23 17.27 17.68 19.58 19.66 30 11.00 6.33 6.99 7.87 --- 12.16 15.27 17.33 17.73 19.63 19.70 31 11.11 --- 6.94 7.96 12.25 --- 17.39 --- 19.66 19.73 LOW 11.11 11.45 7.00 7.96 9.43 12.25 15.27 17.39 17.73 19.66 19.78 HIGH 8.31 4.94 5.80 6.91 8.03 9.52 12.35 15.34 16.36 17.79 19.02 4 0 -J X , CO 1- I- 10 la 04 W Z -cc > La 0 16 cez w 4 i- <c JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1983 1984 22 366 QUALITY OF GROUND WATER WATER QUALITY DATA, WATER YEAR OCTOBER 1933 TO SEPTEMBER 1984 TOTAL SPECIFIC ALKA- DEPTH CONDUCT- PH LINITY, CHLO- OF DATE ANCE (STAND- TEMPER- TOTAL AS RIDE, WELL OF (MICRO- ARD ATURE CaCO3 TOTAL STATION NUM3ER (FT) SAMPLE MHOS) UNITS) (DEG C) (MG/L) (MG/L) SAINT CROIX, U.S. VIRGIN ISLANDS 174225064471900 01-26-84 5090 7.5 27.0 451 1500 06-25-84 4530 6.4 27.0 502 1350 174225064472000 01-26-84 1310 8.1 26.5 271 225 174243064475100 01-26-84 2020 7.2 27.0 353 445 174245064475800 104 01-26-84 1870 7.1 26.5 625 270 06-25-84 1670 6.9 27.0 260 174303064484400 01-26-84 1520 7.0 26.0 487 220 06-25-84 1700 6.8 27.5 492 200 174527064460100 82 01-27-84 1960 7.4 23.5 459 365 06-25-84 2780 7.1 27.0 444 525 174329064454700 130 06-25-84 2360 7.5 26.5 597 450 SAINT THOMAS, U.S. VIRGIN ISLANDS 182050064580400 80 01-23-84 672 7.0 28.5 192 95 06-28-84 1960 7.0 27.5 280 182136064541900 145 01-25-84 247 6.9 28.5 122 9 06-28-84 310 28.0 11 182029064535200 400 01-25-84 1420 7.2 29.5 500 130 06-29-84 1670 23.0 150 182038064550300 70 01-23-84 797 7.6 30.0 367 55 06-29-84 850 74 SAINT JOHN, U.S. VIRGIN ISLANDS 132010064472600 99 01-24-84 576 6.4 28.5 287 33 06-27-84 630 6.8 24.0 75 182109064460300 60 01-24-84 1560 7.2 27.5 465 260 06-27-84 1670 7.0 24.0 260 182116064451000 70 01-24-84 1630 7.3 26.5 484 280 06-27-84 1940 6.8 23.0 492 310 181951064422100 62 01-24-84 480 7.8 27.0 144 78 06-27-84 535 7.4 25.5 152 80 182042064454500 70 01-24-84 845 7.3 25.5 459 30 06-27-84 1320 7.0 23.0 528 118 1 181956064464500 85 01-24-84 624 7.8 25.5 187 82 06-27-84 2240 7.5 25.5 574 375 367 PUBLICATIONS ON TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS Thirty-seven manuals by the U.S. Geological Survey have been published to date in the series on techniques describing procedures for planning and executing 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) is on surface water. The chapter, the unit of publication, is limited to a narrow field of subject matter. This form at 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). NOTE: When ordering any of these publications, please give the title, book number, chapter number, and "U.S. Geological Survey Techniques of Water-Resources Investigations". 1-D1. Water temperature--influential factors, field measurement, and data presentation, by H. H. Stevens, Jr., J. F. Ficke, and G. F. Smoot: USGS--TWRI Book 1, Chapter Dl. 1975. 65 pages. 142. Guidelines for collection and field analysis of ground-water samples for selected unstable constituents, by W. W. Wood: USGS--TWRI Book 1, Chapter D2. 1976. 24 pages. 2-D1. Application of surface geophysics to ground-water investigations, by A. A. R. Zohdy, G. P. Eaton, and D. R. Mabey: USGS--TWRI Book 2, Chapter Dl. 1974. 116 pages. 2-El. Application of borehole geophysics to water-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-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-B1. Aquifer-test design, observation, and data analysis, by R. W. Stallman: USGS--TWRI Book 3, Chapter 61. 1971. 26 pages. 3-B2. Introduction to ground-water hydraulics, a programed text for self-instruction, by G. D. Bennett: USGS--TWRI Book 3, Chapter B2. 1976. 172 pages. 3-63. Type curves for selected problems of flow to wells in confined aquifers, by J. E. Reed: USGS--TWRI Book 3, Chapter B3. 1980. 106 pages. 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 Bl. 1972. 18 pages. 4-B2. Storage analyses for water supply, by H. C. Riggs and C. H. Hardison: USGS--TWRI Book 4, Chapter B2. 1973. 20 pages. 4-B3. Regional analyses of streamflow characteristics, by H. C. Riggs: USGS--TWRI Book 4, Chapter B3. 1973. 15 pages. 4-01. Computation of rate and volume of stream depletion by wells, by C. T. Jenkins: USGS--TWRI Book 4, Chapter Dl. 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-C1. 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. Schaffranek, R. A. Baltzer, and D. E. Goldberg: USGS--TWRI Book 7, Chapter C3. 1981. 110 pages. 8-Al. Methods of measuring water levels in deep wells, by M. S. Garber and F. C. Koopman: USGS-­ TWRI Book 8, Chapter Al. 1968. 23 pages 8-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. 369 INDEX Page Acre-foot, definition of 9 Adjuntas, Lago Garzas No. 1 near dam near 285,286,287,293,294,295 Adjuntas, Rio Blanco near 246-247 Adjuntas, Rio Grande de Arecibo near 48-49 Aguada, Rio Culebra near 282 Aguada, Rio Culebrinas near 264-265,282 Aguada, Rio Ingenio near 282 Agua at Playa de Ponce, Quebrada del 281 Aguas Buenas, Rio de BayamOn near 116-117 Aguas Claras basin, Quebrada, low-flow partial-record stations in 274 Aguas Claras near Ceiba, Quebrada 274 Aguas Verdes basin, Quebrada, ground-water records in 324 Algae, definition of 9 Analyses of samples collected at water-quality partial-record stations in Puerto Rico 285-295 Ant6n Ruiz at mouth, Rio 276 at Pasto Viejo 275 Anton Ruiz basin, Rio, ground-water records in 313 low-flow partial-record stations in 275-276 Afiasco, Rio Grande de Afiasco near 256-257 Afiasco Arriba, Rio Grande de Afiasco at 282 Apeadero basin, Rio, ground-water records in 319 Aquifer, definition of 9 Arecibo, Rio Grande de Arecibo above 56-58 Arroyo, Rio Nigua at 279 Arroyo, Quebrada Corazon near 279 Arroyo, Quebrada Salads near 279 Artesian, definition of 9 Arus, Rio Inabon near 280 Arus, Rio Jacaguas at 280 Bairoa at mouth, Rio 270 near Caguas 143-144 Bacteria, definition of 9 Bahia de San Juan No. 5 at San Juan 127 Balboa, Rio Yaguez at 282 BayamOn, at Flood Channel at BayamOn, Rio de 120-121,268 near Aguas Buenas 116-117 BayamOn basin, Rio de, ground-water records in 310 low-flow partial-record stations in 268 water-quality records in 116-121 BayamOn, Cant:, de Quebrada Catalina at 268 Bayamon, Quebrada Santa Catalina at 268 Bayamon, Rio Hondo at 268 BayamOn, Rio Guaynabo near 118-119 Bayamon, Rio Hondo II near 268 Bayaney, Rio Camuy near 44 Beatriz above Rio Turabo, Quebrada 269 Beatriz, Rio Turabo below Quebrada 269 Bed material, definition of 10 Biochemical oxygen demand, definition of 10 Blanco at mouth, Rio 275 at Rio Blanco 275 below La Fe 275 near Adjuntas 246-247 near Florida 182-183 Blanco basin, Rio, gaging station records in 180-183 ground-water records in 312 low-flow partial-record stations in 275 Blasina basin, Quebrada, low-flow partial-record stations in 269 water-quality records in 130-131 Blasina near Carolina, Quebrada 130-131,269 Blue-green algae, definition of 14 Bonne Resolution Gut at Bonne Resolution, St. Thomas, VI 339-340 Bogner- 282 6n at Boquer6n, Quebrada BoquerOn basin, Quebrada, low-flow partial-record stations in 282 Boquer6n, Laguna Cartagena near 232 Boqueron, Laguna Cartagena outflow near 233 Boquer6n, Lajas Irrigation Canal near 227 Borinquen, Rio Turabo at 137,269 Botija at Highway 31, Quebrada 275 Botija basin, Quebrada, low-flow partial-record stations in 275 Bottom material, definition of 10 Bucang basin, Rio, gaging station records in 212 ground-water records in 331 low-flow partial-record stations in 280 water-quality records in 213-214 Bucang at Ponce, Rio 280 Page Caguas, Lago Loiza No. 4 near mouth near 290,291 Caguas, Rio Bairoa near 143-144 Caguas, Rio Caguitas at Highway 30 at 141-142 Caguas, Rio Grande de Loiza at 138-140 Caguas, Rio Turabo at 270 Caguitas above mouth, Rio 270 at Highway 30 at Caguas 141-142 Caimito near Juncos, Quebrada 145 Calabazas, Rio Guayanes at 277 Cambalache near Loiza, Quebrada 272 Camp Eliza Colberg, Rio Espiritu Santo at 272 Campo Rico, Rio CanOvanas near 156-157 Camuy basin, Rio, gaging station records in 44-45 low-flow partial-record stations in 267 Camuy at Capaez, Rio 267 Camuy near Bayaney, Rio 44 near Hatillo 45 Canal Principal de Diversiones at Lago de Guajataca.. 37-38 Canal Principal de Riego Valle de Lajas basin, gaging stations records in 227 Candelero at Highway 906, Rio 276 at mouth 276 Candelero basin, Rio, low-flow partial-record stations in 276 CanOvanas at La Marina, Rio 271 at Loiza 271 near Campo Rico 156-157 Canovanillas at Carruzos, Rio 271 at Loiza 271 Cafias above Lago Loiza, Rio 271 below Las Amgricas Avenue 281 near Santa Isabel 280 Cafias basin, Rio, low-flow partial-record stations in 280 Cafio de Quebrada Catalina at BayamOn 268 Cali° Santiago near Central Roig 278 Caonillas above Lago Caonillas near Jayuya, Rio 52-53 Capaez, Rio Camuy at 267 Caparra Heights, Quebrada Margarita at 268 Carolina, Quebrada Blasina near 130-131,269 Carolina, Rio Grande de Loiza above 271 Carolina, Rio Grande de Loiza at 271 Carruzos, Rio Canovanillas at 271 Castafier, Lago Guayo near 249 Castafier, Lago Prieto near 250 Castafier, Lago Yahuecas near 248 Catafio, Rio Hondo at Flood Channel near 114-115 Cayaguas at Cerro Gordo, Rio 135-136 Cayey, Lago Carite No. 1 near dam near 288,289,293,294,295 Cayey, Lago Carite No. 3 on Rio de la Plata near 287,288 Ceiba at Ceiba, Quebrada 274 Ceiba basin, Quebrada, low-flow partial-record stations in 274 Ceiba Norte, Rio Gurabo at 270 Ceiba, Quebrada Aguas Claras near 274 Cells/volume, definition of 10 Central Cambalache, Rio Grande de Arecibo at 66-67 Central Guamani, Rio Seco near 279 Central Roig, Cafio Santiago near 278 Central Roig, Rio Guayanes at 277 Central Rufina, Rio Guayanilla at 221-222 Central San Vicente, Drainage Ditch at Rio Cibuco below 96-97 Central San Vicente, Rio Cibuco below 98-99 Cerrillos near Ponce, Rio 212-214 Cerro Gordo, Rio Cayaguas at 135-136 Cfs-day, definition of 10 Charco Hondo, Rio Tanamg at 65 Chico at Providencia, Rio 197-198,278 Chico basin, Rio, low-flow partial-record stations in 278 water-quality records in 197-198 Chlorophyll, definition of 10 Ciales, Rio Cialitos at Highway 649 at 79-80 Ciales, Rio Grande de Manati at 75-76 Ciales, Rio Grande de Manati at Highway 149 at 77-78 Cialitos at Highway 649 at Ciales, Rio 79-80 Cibuco at Vega Baja, Rio 91-93 below Central San Vicente 98-99 below Corozal 88-90 Cibuco basin, gaging-station records in 88-91 ground-water records in low-flow partial-record stations in 267 water-quality records in 30489-99 - INDEX Page Coamo basin, Rio, gaging-station records in ground-water records in 323,324-326 low-flow partial-record stations 280 water-quality records in 205-206 Coamo near Coamo, Rio 204-206 near Santa Isabel 280 Colonia Dolores, Rio Herrera near 272 Colonia Laura, Rio Guayanes near 276 Comerio, Rio de la Plata near 105-106 Control, definition of 10 Control structure, definition of 10 Cooperation 1-2 CorazOn basin, Quebrada, low-flow partial-record stations in Coraz6n near Arroyo, Quebrada Corozal, Rio Cibuco below Crest-stage station, definition of Crest-stage partial-record stations, discharge at Cubic feet per second per square mile, definition of Cubic foot per second, definition of Culebra basin, Rio, low-flow partial-record stations in 282 Culebra near Aguada, Rio 282 Culebrinas, at Highway 404 near Moca, Rio 262-263 near Aguada 264-265,282 near San Sebastian 260-261 Culebrinas basin, Rio, gaging station records in 262 ground-water records in 335 low-flow partial-record stations in 282 water-quality records in 260-265 Daguao above mouth, Rio 274 at Daguao 274 Daguao, Quebrada Palma at 274 Daguao basin, Rio, low-flow partial-record stations in 274 Damsite, Lago Loiza at 153,271 Definition of terms 9-16 De los Cedros basin, Quebrada, low-flow partial- record stations in 267 De los Cedros near Isabela, Quebrada 267 Demajagua at Demajagua, Rio 274 Demajagua basin, Rio, low-flow partial-record station in 274 Descalabrado basin, Rio, gaging stations records in 207,280 low-flow partial-record stations in 280 Descalabrado near Los Llanos, Rio 207 near Santa Isabel 280 Diatoms, definition of 14 Discharge at crest-stage partial-record stations 283 Discharge at low-flow partial-record stations 267-282 Discharge at partial-record stations in Puerto Rico 267-282 Discharge, definition of 10 Dissolved, definition of 11 Diversity index, definition of 11 Downstream order and station number 16-17 Drainage area, definition of 11 Drainage basin, definition of 11 Drainage ditch at Rio Cibuco below Central San Vicente 96-97 below Warner Lambert Lab. near Sabana El Mango, Rio Gurabo at 270 El Verde, Quebrada Sonadora near 160 El Verde, Quebrada Toronja at 161-162 El Verde, Rio Grande near 272 Espiritu Santo basin, Rio, gaging station records in 160-163 low-flow partial-record stations in 272 water-quality records in 164-165 Espiritu Santo at Camp Eliza Colberg, Rio 272 near Rio Grande 163-165 Explanation of ground-water level records 24-25 Explanation of stage and water-discharge records 18-22 Explanation of water-quality records 22-24 Fajardo at Fajardo, Rio 274 at Vapor below confluence 273 below Fajardo 178-179 near Fajardo 172-177 Fajardo at Highway 194, Quebrada 273 Fajardo basin, Quebrada, low-flow partial-record stations in 273 Fajardo basin, Rio, gaging station records in 172 low-flow partial-record stations in 273-274 water-quality records in 173-179 204,280 Fajardo, Quebrada Mata Redonda near 274 Fecal coliform bacteria, definition of 9 Fecal streptococcal bacteria, definition of 9 Florida, Rio Blanco near 182-183 Florida, Rio Grande de Arecibo below Lago Dos Bocas near 54-55 Gage-height, definition of 11 Gaging station, definition of 11 Grande at La Gloria, Quebrada 271 Grande basin, Rio, low-flow partial-record stations in 282 Grande de Aflasco basin, Rio, gaging station 279 records in 246-253 279 ground-water records in 334 88-90 low-flow partial-record stations in 282 10 water-quality records in 251-257 283 Grande de Anasco at Anasco Arriba, Rio 282 10 near Afiasco 256-257 10 near Lares 251-252 near San Sebastian 253-255 Grande de Arecibo at Central Cambalache, Rio 66-67 above Arecibo 56-58 below Lago Dos Bocas near Florida 54-55 near Adjuntas 48-49 near Utuado 50-51 Grande de Arecibo basin, Rio, gaging station records in 56-65 ground-water records in 300 water-quality partial-record stations, analyses of samples collected in 285,286,287,288,289,294 water-quality records in 48-67 Grande de Loiza above Carolina, Rio 271 at Caguas 138-140 at Carolina 271 at Highway 183 269 at Jagual 269 at Quebrada Arenas 132-133 at San Lorenzo Norte 269 below Rio Emajagua 269 below Trujillo Alto 154-155 Grande de Loiza basin, Rio, gaging station records in 132-156 ground-water records in 311 low-flow partial-record stations in 269-271 water-quality partial-record stations, analyses of samples collected in 290,291,292,293,294,295 water-quality records in 130-157 Grande de Manati at Ciales, Rio 75-76 at Highway 2 near Manati 81-84 at Highway 149 at Ciales 77-78 near Morovis 72-74 Grande de Manati basin, Rio, gaging station records in 72-81 ground-water records in 301-303 water-quality records in 70-85 Grande de Patillas at Patillas, Rio 278 at Providencia 278 below Quebrada Sonadora 278 near Patillas 199-201 94-95 Grande de Patillas basin, Rio, gaging station records in 199 low-flow partial-record stations in 278 water-quality records in 200-201 Grande at Rio Grande, Rio 272 near El Verde 272 near RincOn 282 Green algae, definition of 14 Ground-water records for Puerto Rico 298-335 Ground-water records for U.S. Virgin Islands 348-365 Ground-water records for U.S. Virgin Islands, quality of 366 Ground-water level records, explanation of 24-25 Ground-water station, definition of 11 Ground-water stations in Puerto Rico, map showing location of 298 Ground-water wells in U.S. Virgin Islands, map showing location of 348 Guadiana near Naranjito, Rio 107-108 Guajataca above Lago de Guajataca, Rio 36 above mouth near Quebradillas 40-42,267 at Lares 34-35 below Lago de Guajataca 39 371 INDEX Page Guajataca basin, Rio, gaging station records in 36-40 ground-water records in 299 low-flow partial-record stations in 267 water-quality partial-record stations, analyses of samples collected in 285-286 water-quality records in 34-42 Guamani basin, Rio, ground-water records in 317 low-flow partial-record stations in 279,282 Guamani near Guayama, Rio 279 Guanajibo below San Germgn, Rio 282 near Hormigueros 240-242 near San German 234-235,282 Guanajibo basin, Rio, gaging station records in 236 ground-water records in 232-333 low-flow partial-record stations in 282 water-quality records in 234-242 Gugnica, Rio Loco at 228-229 Gugnica, Rio Loco near 281 Guayama, Rio Guamani near 279 Guayana above mouth at Playa de Guayangs, Rio 191-192 at Calabazas 277 at Central Roig 277 at Playa de Guayangs 191-192 at Yabucoa 189-190,277 below Rio Arenas 277 near Colonia Laura 276 near mouth near Playa de Guayangs 277 Guayangs basin, Rio, ground-water records in 317-318 low-flow partial-record stations in 276-277 water-quality records in 189-192 Guayanilla at Central Rufina, Rio 221-222 near Guayanilla 220 Guayanilla basin, Rio, gaging station records in 220 ground-water records in 328 water-quality records in 221-222 Guaynabo near Bayamon, Rio 118-119 Guinea Gut at Bethany, St. John, VI 343 Gurabo at Gurabo, Rio 149-150 at Ceiba Norte 270 at El Mango 270 below Highway 943 270 near Gurabo 151-152 near Juncos 270 Gurabo, Quebrada Mamey near 148 Hacienda San Isidro, Rio Jacaboa at 278 Hardness, definition of 11 Hatillo, Rio Camuy rear 45 Hato Rey, Rio Piedras at 124-125 Herrera near Colonia Dolores, Rio 272 near Loiza 272 Herrera basin, Rio, low-flow partial-record stations in 272 Honda at Las Torres, Quebrada 270 Hondo at Bayamon, Rio 268 at Flood Channel near Catafio, Rio 114-115 Hondo II near Bayam5n, Rio 268 Hondo basin, Rio, low-flow partial-record stations in 268 water-quality records in 114-115 Hormigueros, Rio Guanajibo near 240-242 Hormigueros, Rio Rosario near 238-239 Humacao at Highway 3 at Humacao, Rio 186-188 at Las Piedras 276 Flood Channel near mouth 276 near Humacao 276 Humacao basin, Rio, gaging station records in 186 ground-water records in 320 low-flow partial-record stations in 276 water-quality records in 187-188 Hydrologic conditions, summary of 2-8 Icacos near Naguabo, Rio 180-181 Inabein at Real Abajo, Rio 210-211 near Arus 280 Inabein basin, Rio, gaging station records in 210-211 low-flow partial-record stations in 280 Indio near Vega Baja, Rio 267 Ingenio basin, Rio, low-flow partial-record stations in 282 Ingenio basin, Rio del, ground-water records in 335 Ingenio near Aguada, Rio 282 Ingenio near Playa de Guayangs, Rio del 277 near Yabucoa 277 Page Instantaneous discharge, definition of 11 Introduction 1 Isabela, Quebrada de los Cedros near 267 Jacaboa at Hacienda San Isidro, Rio 278 Jacaboa basin, Rio, low-flow partial-record stations in 278 Jacaguas at Arus, Rio 280 at Juana Diaz 208 Jacaguas basin, Rio, gaging station records in 208 ground-water records in 324 low-flow, partial-record stations in 280 Jagual, Rio Grande de Loiza at 269 Jauca, Rio Jueyes near 280 Jayuya, Rio Caonillas above Lago Caonillas near 52-53 Jimenez near Rio Grande, Quebrada 272 Jobos, Rio Melania near 279 Jolly Hill Gut at Jolly Hill, St. Croix, VI 344-345 Josefina at Pifieiro Avenue, Quebrada 268 Juan Gonzalez near Rio Grande, Quebrada 272 Juan Martin above mouth, Rio 273 at Highway 3, Tributary to 273 Juan Martin basin, Rio, low-flow partial-record stations in 273 Juana Diaz, Rio Jacaguas at 208 Jueyes basin, Rio, low-flow partial-record stations in 280 Jueyes near Jauca, Rio 280 Juncos, Quebrado Caimito near 145 Juncos, Rio Gurabo near 270 Juncos, Rio Valenciano near 146-147 La Fe, Rio Blanco below 275 La Fe, Quebrada Vaca below 275 La Gloria, Quebrada Grande at 271 Lago Carite No.1 near dam near Cayey 288,289,293,294,295 No. 3 on Rio de la Plata near Cayey 287,288 Lago de Guajataca, Canal Principal de Diversiones at 37-38 No. 1 near dam near Quebradillas 285,286 No. 3 near mouth near Quebradillas 285,286 Rio Guajataca above 36 Rio Guajataca below 39 Lago Dos Bocas No. 1 near dam near Utuado 287,288,289,294,295 No. 3 at west branch near Utuado 287,288 Lago Garzas No. 1 near dam near Adjuntas 285,286,287 Lago Guayo near Castafier 249 Lago La Plata No. 3 near dam near Naranjito 290,291,292,293,294,295 No. 5 near mouth near Naranjito 289,290 Lago Loiza at damsite 153,271 No. 4 near mouth near Caguas 290,291 No. 7 near dam near Trujillo Alto...290,291,292,293,294,295 Lago Loiza, Rio Cafias above 271 Lago Prieto near Castafier 250 Lago Yahuecas near Castafier 248 Laguna Cartagena basin, gaging station records in 232-233 Laguna Cartagena near Boqueron 232 Laguna Cartagena outflow near Boquer6n 233 Laguna San Jose No. 2 at San Juan 126 Laguna Tortuguero basin, water-quality records in 85 Laguna Tortuguero outlet near Vega Baja 85 Lajas at Toa Alta, Rio 267 Lajas Irrigation Canal near BoquerOn 227 La Marina, Rio CanOvanas at 271 La Plata at Proyecto La Plata, Rio de 102-104 at Toa Alta 109-112 near Comerio 105-106 La Plata basin, Rio de, gaging station records in 102-109 ground-water records in 308-309 low-flow partial-record stations in 267 water-quality partial-record stations, analyses of samples collected in.287,288,289,290,292,293,294,295 water-quality records in 103-112 Lares, Rio Grande de Afiasco near 251-252 Lares, Rio Guajataca at 34-35 Las Bambuas at mouth, Quebrada 269 Las Piedras, Rio Humacao at 276 Las Piedras, Rio Valenciano near 270 Las Torres, Quebrada Honda at 270 Levels for Puerto Rico, ground-water 298-335 Levels for U.S. Virgin Islands, ground water 348-365 Limones near Yabucoa, Rio 277 372 INDEX Page Lizas, Rio Maunabo at 193-194 Loco at Gugnica, Rio 228-229 near Gugnica 281 Loco basin, Rio, low-flow partial-record stations in 281 water-quality records in 228-229 Loiza, Quebrada Cambalache near 272 Loiza, Rio Canovanas at 271 Loiza, Rio Canovanillas at 271 Loiza, Rio Herrera near 272 Los Llanos, Rio Descalabrado near 207 Low-flow partial-record stations, Discharge at 267-283 Low-flow partial-record in Eastern Puerto Rico, map showing 30 Low-flow partial-record in Western Puerto Rico, map showing 31 Luquillo, Quebrada Mata de Plgtano near 273 Luquillo, Rio Pitahaya near 273 Luquillo, Rio Sabana at 273 Macang at Magas Arriba, Rio 281 Macang basin, Rio, low-flow partial-record stations in 281 Magas Arriba, Rio Macang at 281 Majada at Rabo del Buey, Rio 279 Mamey near Gurabo, Quebrada 148 Mameyes at Mameyes, Rio 273 at Highway 191 at Mameyes 168-169 near Sabana 166-167 Mameyes basin, Rio, gaging station records in 166-169 low-flow partial-record stations in 273 Manati, Rio Grande de Manati at Highway 2 near 81-84 Maps: Location of ground-water stations in Puerto Rico... 298 Location of ground-water wells in U.S. Virgin Islands 348 Location of low-flow partial-record stations in Eastern Puerto Rico 30 Location of low-flow partial-record stations in Central and Western Puerto Rico 31 Location of surface-water stations in the U.S. Virgin Islands 338 Location of surface-water stations in Puerto Rico.. 28 Location of water-quality stations in Puerto Rico.. 29 Rio Camuy basin 43 Rio Cibuco basin 87 Rio Culebrinas basin 259 Rio Grande de Arecibo basin 47 Rio Grande de Loiza basin 129 Rio Grande de Manati basin 69 Rio Guajataca basin 33 Rio Guanajibo basin 231 Rio Herrera to Rio Ant6n Ruiz basins 159 Rio Hondo to Rio Puerto Nuevo basins 113 Rio Humacao to Rio Seco basins 185 Rio Inablin to Rio Loco basins 209 Rio de la Plata basin 101 Rio Salinas to Rio Jacaguas basins 203 Rio Yagiiez and Rio Grande de Afiasco basins 243 Maracuta at Trujillo Bajo, Quebrada 271 Margarita at Caparra Heights, Quebrada 268 Mariana at Patagonia, Quebrada 276 Mata de Plgtano basin, Quebrada, low-flow partial- record stations in 273 Mata de Plgtano near Luquillo, Quebrada 273 Mata Redonda near Fajardo, Quebrada 274 Matilde basin, Rio, low-flow partial-record stations in 281 Maunabo at Lizas, Rio 193-194 at Maunabo 195-196,278 Maunabo basin, Rio, gaging station records in 193-194 ground-water records in 319 low-flow partial-record stations in 278 water-quality records in 195-196 Mayaguez, Rio YagUez near 244-245 Mean concentration, definition of 15 Mean discharge, definition of 11 Melania basin, Rio, low-flow partial-record stations in 279 Melania near Jobos, Rio 279 Micrograms per gram, definition of 12 Micrograms per liter, definition of 12 Milligrams per liter, definition of 12 Miscellaneous sites, numbering system for wells and 17 Moca, Rio Culebrinas at Highway 404 near 262-263 Morovis, Rio Grande de Manati near 72-74 Page Naguabo, Rio Icacos near 180-181 Naguabo, Rio Santiago at 275 Naranjito, Lago La Plata No. 3 near dam near 290,291,292,293,294,295 Naranjito, Lago La Plata No. 5 near mouth near 289,290 Naranjito, Rio Guadiana near 107-108 NASQAN, definition of 17-18 National stream-quality accounting network 17-18 Networks and programs, special 17-18 Nigua at Arroyo, Rio 279 Nigua basin, Rio, ground-water records in 316 low-flow partial-record stations in 279 Numbering system for wells and miscellaneous sites 17 Organism, definition of 12 Organism count/area, definition of 12 Organism count/volume, definition of 12 Orocovis near Orocovis, Rio 70-71 Palma at Daguao, Quebrada 274 Palma basin, Quebrada, low-flow partial-record stations in 274 Palomas, Quebrada Susfia at 281 Partial record station, definition of 13 Partial-record stations, Discharge at 267-282 Partial-record stations in Central and Western Puerto Rico, map showing location of 31 Partial-record stations in Eastern Puerto Rico, map showing location of 30 Particle size, definition of 13 Particle-size classification, definition of 13 Pasto Viejo, Rio Ant6n Ruiz at 275 Patagonia, Quebrada Mariana at 276 Patillas, Rio Grande de Patillas at 278 Patillas, Rio Grande de Patillas near 199-201 PCBs, definition of 14 Percent composition, definition of 13 Pesticides, definition of 13 Pesticide program 18 Phytoplankton, definition of 13 Piedras, at Hato Rey, Rio 124-125 at Rio Piedras 268 near Rio Piedras 122-123 Pifieiro Avenue, Quebrada Josefina at 268 Pitahaya basin, Rio, low-flow partial-record stations in 273 Pitahaya near Luquillo, Rio 273 Plankton, definition of 13 Playa de Guayangs, Rio del Ingenio near 277 Playa de Guayangs, Rio Guayanes above mouth at 191-192 Playa de Guayangs, Rio Guayangs at 277 Playa de Guayangs, Rio Guayanes near mouth near 277 Playa de Ponce, Quebrada del Agua at 281 Polychlorinated biphenyls, definition of 14 Ponce, Rio Bucang at 280 Ponce, Rio Cerrillos near 212-214 Ponce, Rio Portugugs at 218-219 Ponce, Rio Portugugs at Highway 14 at 283 Ponce, Rio Portugugs at Highway 2 by-pass at 281 Ponce, Rio Portugugs near 215-217 Portugugs at Highway 14 at Ponce, Rio 283 at Highway 2 by-pass at Ponce 281 at Ponce 218-219 near Ponce 215-217 Portugugs basin, Rio, crest-stage partial-record station in 283 gaging station records in 215 ground-water records in 327 low-flow partial records stations in 281 water-quality records in 216-219 Programs, special networks and 17-18 Providencia, Rio Chico at 197-198,278 Providencia, Rio Grande de Patillas at 278 Proyecto La Plata, Rio de La Plata at 102-104 Publications on techniques of water-resources investigations 367 Puerto Nuevo basin, Rio, ground-water records in 310 low-flow partial-record stations in 268 water-quality records in 122-127 Quality of ground water for U.S. Virgin Islands 348-365 Quebrada Arenas, Rio Grande de Loiza at 132-133 Quebrada Sonadora, Rio Grande de Patillas below 278 Quebradillas, Lago Guajataca No. 1 near dam near 285,286,293,294,295 373 INDEX Page Quebradillas, Lago Guajataca No. 3 near mouth near... 285,286 Quebradillas, Rio Guajataca above mouth near 40-42,267 Rabo del Buey, Rio Majada at 279 Real Abajo, Rio Inab6n at 210-211 Rincon, Rio Grande near 282 Rio Arenas, Rio Guayanes below 277 Rio Emajagua, Rio Grande de Loiza below 269 Rio Grande, Quebrada Jimenez near 272 Rio Grande, Quebrada Juan Gonzalez near 272 Rio Grande, Rio Espiritu Santo near 163-165 Rosario at Rosario, Rio 236-237 near Hormigueros 238-239 Runoff, in inches, definition of 14 Sabana at Luquillo, Rio 273 at Sabana 170-171 Sabana basin, Rio, gaging station records in 170-171 low-flow partial-record stations in 273 Sabana, Drainage ditch below Warner Lambert Lab. near 94-95 Sabana, Rio Mameyes near 166-167 Salada basin, Quebrada, low-flow partial-record stations in 279 Salada near Arroyo, Quebrada 279 Salinas at Salinas, Rio 279 Salinas basin, Rio, ground-water records in 321,322 low-flow partial-record stations in 279 Salvatierra near San Lorenzo, Quebrada 134 San German, Rio Guanajibo below 282 San German, Rio Guanajibo near 234-235 San Juan, Bahia de San Juan no. 5 at 127 San Juan, Laguna San Jose No. 2 at 126 San Lorenzo, Quebrada Salvatierra near 134 San Lorenzo Norte, Rio Grande de Loiza at 269 San Sebastian, Rio Culebrinas near 260-261 San Sebastian, Rio Grande de Afiasco near 253-255 Santa Catalina at Bayam6n, Quebrada 268 Santa Isabel, Rio Cafias near 280 Santa Isabel, Rio Coamo near 280 Santa Isabel, Rio Descalabrado near 280 Santiago at Naguabo, Rio 275 Santiago at Highway 3, Cafio 278 near Central Roig 278 Santiago basin, Cafio, low-flow partial-record stations in 278 Santiago basin, Rio, low-flow partial-record stations in 275 Seco basin, Rio, ground-water records in 314-315 low-flow partial-record stations in 279 Seco near Central Guamani, Rio 279 Sediment 24 Sediment, definition of 14 Sonadora near El Verde, Quebrada 160 Solute, definition of 15 Special network and programs 17-18 Specific conductance, definition of 15 Stage and water-discharge records, explanation of.... 18-22 Stage-discharge relation, definition of 15 Station number, downstream order and 16-17 St. Croix, VI, Jolly Hill Gut at Jolly Hill 344-345 St. John, VI, Guinea Gut at Bethany 343 Streamflow, definition of 15 St. Thomas, VI, Bonne Resolution Gut at Bonne Resolution 339-340 St. Thomas, VI, Turpentine Run at Mariendal 341-342 Summary of hydrologic conditions 2-8 Surface and quality-of-water records for Puerto Rico. 33-265 Surface-water records for U.S. Virgin Islands 338-345 Surface-water stations in Puerto Rico, map showing location of 28 Page Surface-water stations in U.S. Virgin Islands, map showing location of 338 Surficial bed material, definition of 15 Suspended, definition of 15 Suspended sediment, definition of 14 Suspended-sediment concentration, definition of 14 Suspended-sediment discharge, definition of 14 Suspended-sediment load, definition of 14 Susga at Palomas, Quebrada 281 Tallaboa at Tallaboa, Rio 281 Tallaboa basin, Rio, low-flow partial-record stations in 281 Tanamg at Charco Hondo, Rio 65 near Utuado 59-64 Taxonomy, definition of 16 Techniques of water-resources investigations, publications on 367 Temperature, water 23 Terms, definition of 9-16 Time-weighted average, definition of 15 Toa Alta, Rio de La Plata at 109-112 Toa Alta, Rio Lajas at 267 Tons per acre-foot, definition of 15 Tons per day, definition of 15 Toronja at El Verde, Quebrada 161-162 Total coliform bacteria, definition of 9 Total load, definition of 16 Total organism count, definition of 13 Total sediment discharge, definition of 15 Tributary to Rio Juan Martin at Highway 3 273 Tributary to Rio Santiago at Highway 192 275 Tritium network 18 Trujillo Alto, Lago Loiza No. 7 near dam near 290,291,292,293,294,295 Trujillo Alto, Rio Grande de Loiza below 154-155 Trujillo Bajo, Quebrada Maracuta at 271 Turabo at Borinquen, Rio 137,269 at Caguas 270 below Quebrada Beatriz 269 Turabo, Quebrada Beatriz above Rio 269 Turpentine Run at Mariendal, St. Thomas, VI 341-342 Utuado, Lago Dos Bocas No. 1 near dam near 287,288,289,293,294,295 Utuado, Lago Dos Bocas No. 3 at west branch near 287,288 Utuado, Rio Grande de Arecibo near 50-51 Utuado, Rio Tanamg near 59-64 Vaca below La Fe, Quebrada 275 Valenciano at mouth, Rio 270 near Juncos 146-147 near Las Piedras 270 Vapor below confluence, Rio Fajardo at 273 Vega Baja, Laguna Tortuguero outlet near 85 Vega Baja, Rio Cibuco at 91-93 Vega Baja, Rio Indio near 267 Water analysis 23 Water-discharge records, explanation of stage and.... 18-22 Water-quality partial-record stations in Puerto Rico, analyses of samples collected at 285-295 Water-quality records, explanation of 22-24 Water-quality stations in Puerto Rico, map showing location of 29 Water-resources investigations, publications on techniques of 367 Water temperature 23 Water year, definition of 16 Weighted average, definition of 16 374 Wells - Puerto Rico: Aguas Verdes basin, Quebrada Well 124 - Coqui 2 Ant6n Ruiz basin, Rio Well 173, Squibb Apeadero basin, Rio Well 125 - Patillas STP Bayam6n basin, Rio de Well 42 - Cidra 2 Well 66 - Sabana Seca Blanco basin, Rio Well 171, Arroyo Bucang basin, Rio Well 141 - Restaurada 8A Cibuco basin, Rio Well 62 - Vega Alta 1 Well 70 - Sabana Hoyos Well 151 - Rice Program #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 #5 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 Well 83 - San Sebastign Grande de Ariasco basin, Rio Well 53 - Mayagilez Airport Grande de Arecibo basin, Rio Well 86 - Adjuntas Well 123 - Jayuya 3 Well 161 - Santana #2 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 - Morgn Sim6 Well 166 - Manati (new well) Guamani basin, Rio Well 89 - Phillips observation well 3 Guajataca basin, Rio Well 164 - Rocha Moca Well 165 - Mateo Perez, Bo. Salto Guanajibo basin, Rio Well 40 - Rosario Well 43 - Central Rochelaise Well 143 - Vivoni, Hacienda Amistad Guayanes 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 Potgla La Plata basin, Rio de Well 33 - Cayey 10 Well 37 - Barrio Rinc6n de Cidra Well 38 - Barrio Robles Well 67 - Campanilla Well 69 - Higuillar Well 150 - Monterey Forestal INDEX Page Page Maunabo basin, Rio Well 122 - Maunabo Calzada 319 324 Nigua basin, Rio Well 15 - Pitahaya 1 316 313 Portugues basin, Rio Well 21 - Alhambra 327 319 Puerto Nuevo basin, Rio Well 65 - Hato Rey Central, McCraken 310 310 Salinas basin, Rio 310 Well 1 - Mar Negro 321 Well 8 - Salinas 1 321 312 Well 18 - Cocos 322 Well 19 - Theater 1 322 331 Seco basin, Rio Well 2 - Puente Jobos 314 304 Well 3 - Jobos 314 305 Well 6 - Juana 5 315 306 306 Wells (continued) - U.S. Virgin Islands: 306 St. Croix 307 Well 1 - Fairplains 6 (FP6) 349 307 Well 2 - USGS-10, Fairplains 2 (FP2) 350 307 Well 3 - Golden Grove 6 (PW6) 351 Well 4 - Golden Grove 1 (PW1) 352 323 Well 5 - Mahogany Road 3 352 324 Well 6 - Adventure 28 353 325 Well 7 - Concordia 14 354 325 Well 8 - Concordia 1 (main pump house) 354 325 Well 9 - Concordia 7 355 326 Well 10 - Barren Spot 5 (PWD-5) 355 326 St. John Well 1 - NPS-2 (Cruz Bay) 359 335 Well 2 - NPS-5 (Trunk Bay) 359 Well 3 - NPS-6 (Cinnamon Bay) 360 334 Well 4 - USGS-15 (Calabash Boom) 361 Well 5 - DPW-6 362 300 Well 6 - DPW-5 363 300 Well 7 - DPW-4 363 300 Well 8 - DPW-3 363 Well 9 - DPW-2 364 311 Well 10 - DPW-1 364 311 Well 11 - Guinea Gut Well 365 St. Thomas 301 Well 1 - USGS-8 (Family well-Thatch Farm) 356 301 Well 2 - Mahogany 15 356 302 Well 3 - Mahogany 16 356 303 Well 4 - Mahogany 17 357 303 Well 5 - Donoe 3 357 Well 6 - Grade School 3 358 317 YagUez basin, Rio Well 45 - Well 1, Mayaguez 334 299 Yauco basin, Rio 299 Well 16 - Central San Francisco 327 Well 131 - Yauco 1 or UCC 2 328 332 Well 132 - Yauco 2 329 332 Well 134 - Yauco 4 or UCC 1 330 333 Wells and miscellaneous sites, numbering system for 17 317 WRD, definition of 16 318 WSP, definition of 16 327 Yabucoa, Rio del Ingenio near 277 328 Yabucoa, Rio Guayanes at 189-190,277 Yabucoa, Rio Limones near 277 320 Yagiiez at Balboa, Rio 282 near Mayagliez 244-245 335 YagUez basin, Rio, ground-water records in 334 low-flow partial-record stations in 282 324 water-quality records in 244,245 Yauco, above Diversion Monserrate near Yauco, Rio 223-224 308 at Pueblo Sur at Yauco 281 308 near Yauco 225-226 308 Yauco basin, Rio, gaging station records in 223-226 309 ground-water records in 327,328,329,330 309 low-flow partial-record stations in 281 309 Introduction, definition of terms, and explanation of data (1) Continuous surface-water stations in Puerto Rico (28) Water-quality stations in Puerto Rico (29) Low-flow partial-record stations in Puerto Rico (30) Rio Guajataca basin (33) MARGIN INDEX Rio Camuy basin (43) To use, bend book and follow margin index label to page Rio Grande de Arecibo basin (47) with black edge marker. Rio Grande de Manati basin (69) Rio Cibuco basin (87) Rio de la Plata basin (101) Rio Hondo, Rio de Bayamdn, and Rio Puerto Nuevo basins (113) Rio Grande de Loiza basin (129) Northeastern river basins - Rio Herrera to Rio Antdn Ruiz (159) Southeastern river basins - Rio Humacao to Rio Seco (185) South coast river basins - Rio Salinas to Rio Jacaguas (203) South coast river basins - Rio Inabcfn to Rio Loco (209) Rio Guanajibo basin (231) Rio Yaguez and Rio Grande de Masco basins (243) Rio Culebrinas basin (259) Partial-record stations (267) Water-quality partial-record stations (285) Ground-water stations in Puerto Rico (298) Surface-water stations in the U.S. Virgin Islands (338) Ground-water stations in the U.S. Virgin Islands (348) Publications on techniques of water-resources investigations (367) Index (369) 'Vd" 11 /////// /8/8 POSTAGE i'V'ND U.S. DEPARTMENT INT 413 US. DEPARTMENT OF THE INTERIOR Geological Survey GPO Box 4424 [U.S.MAIL: San Juan, PR 00936 OFFICIAL BUSINESS PENALTY FOR PRIVATE USE $300 SPECIAL 4TH CLASS BOOK RATE