USGS Water-Year Summary 2021
50100200 RIO LAPA NEAR RABO DEL BUEY, PR
LOCATION - Lat 18°03'35", long 66°14'28" referenced to North American Datum of 1927, Salinas Municipio, PR, Hydrologic Unit 21010004, on left bank, at bridge on Highway 1, km 9.7, 1.5 mi (2.4 km) north of Rabo del Buey, and 4.4 mi (7.1 km) northeast of Salinas plaza.
DRAINAGE AREA - 9.92 mi². (25.7 km2).
PERIOD OF RECORD - 1953-63; annual low-flow measurements only, September 1988 to current year.
GAGE - Water-stage recorder, crest-stage gage, and satellite telemetry at station. Datum of gage is 370.1 ft. (112.8 m) above Puerto Rico Vertical Datum of 2002 (PRVD02). Elevation or datum was previously reported as 394 ft. (120 m) above mean sea level and NGVD 29 and was established via topographic map and a new GNSS survey was used to establish a PRVD02 datum because the topographic datum did not meet the new accuracy requirements.