USGS Water-Year Summary for Site 50093045

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	Available Parameters
	00045 Precipitation(Sum)
	62614 Elevation, lake/res, NGVD29(Obs.)
	72375 Elevation, lake/res, LMSL(Obs.) [OLDPR]
	72379 Elevation, lake/res, PRVD02(Obs.)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

50093045 LAGO PATILLAS AT DAMSITE NEAR PATILLAS, PR

LOCATION - Lat 18°01'11", long 66°01'08" referenced to North American Datum of 1927, Patillas Municipio, PR, Hydrologic Unit 21010004, on left side of concrete spillway in a galvanized shelter, 0.84 mi (1.34 km) northwest from Patillas plaza, 0.57 mi (0.92 km) northwest from Segunda Unidad de Real School, and 2.56 mi (4.10 km) east from Segunda Unidad de Jesús María Rodríguez School.

DRAINAGE AREA - 25.6 mi². (66.3 km2).

REVISIONS HISTORY -

Maximum elevation was revised on April 13, 2018, due to an error found in the manuscript that same year.

Datum of gage was previously reported as 229.67 ft (70.0 m) above NGVD29 and LMSL-Old PR. NGVD29 datum does not exist in Puerto Rico and the correct LMSL-Old PR elevation is 0 ft, published historical records did not reflect this site file typo. Revised to PRVD02 Datum in October 2022.

SURFACE-WATER RECORDS

PERIOD OF RECORD - March 1995 to current year.

GAGE - Water-stage recorder, satellite and radio telemetry at station. Datum of gage is above Local Mean Sea Level (LMSL- Old PR) and above Puerto Rico Vertical Datum of 2002 (PRVD02).

REMARKS - Lago Patillas was completed in 1914. The dam is a semi-hydraulic earthfill structure about 147 ft (45 m) height, a top width of 15 ft (4.6 m), maximum pool elevation of 230 ft (70.1 m), a base width of 625 ft (190 m), a crest length of 1,067 ft (325 m) and has maximum pool storage of 17,073 acre-ft (21.05 hm3). The Lago Patillas Dam primary purpose is for irrigation of lands served by the Patillas Irrigation canal.

EXTREMES FOR PERIOD OF RECORD - Maximum elevation, 225.49 ft (68.73 m) September 21, 1998; minimum elevation, 203.43 ft (62.0 m), August 28 2015.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - October 2016 to current year.

INSTRUMENTATION - Tipping bucket precipitation gage and data collection platform – 15 minutes interval.