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Water-Year Summary for Site USGS 50048680

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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Available Parameters
62614 Elevation, lake/res, NGVD29(Obs.)  

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

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USGS Water-Year Summary 2023
LOCATION - Lat 18°20'39.82", long 66°03'03.57" referenced to North American Datum of 1927, San Juan Municipio, PR, Hydrologic Unit 21010005, at Lago Las Curias Dam on Río Piedras, 4.15 mi (6.67 km) south of University of Puerto Rico Tower, 1.6 mi (2.57 km) northwest from José F. Díaz School, and 0.8 mi (1.28 km) north of Cupey Alto School.
DRAINAGE AREA - 1.10 mi². (2.51 km2).
PERIOD OF RECORD - April 1, 1997 to September 30, 2015. October 2016 to current year.
GAGE - Elevation of gage is above National Geodetic Vertical Datum (NGVD) of 1929, feet.
REMARKS - Lago Las Curias was completed in 1946. The reservoir has a capacity of 1,135 acre-ft (1.40 hm3) at spillway crest elevation 315.78 ft (96.25 m) for water supply. The dam is earthfill and has a crest elevation of 327.3 ft (99.75 m). Masonry parapet walls continous from abutment on each side of the 25 ft (7.62 m) wide crest. The dam is about 82 ft (25 m) high and 984.2 ft (300 m) long. The morning-glory inlet conduit spillway in located along the left abutment of the dam and has an uncontrolled capacity of about 5,000 ft³/s (141.6 m3/s) at reservoir elevation 321.5 ft (98 m). This dam is operated by the Puerto Rico Aqueduct and Sewer Authority (PRASA). Elevation of the morning glory dam-Crest was confirmed by the original Record Drawing of Water Works Facilities Río Piedras Dam Reservoir General Plan of Dam.
EXTREMES FOR PERIOD OF RECORD - Maximum elevation: 317.32 ft (96.73 m) recorded on May 23, 2004; minimum elevation: 312.79 ft (95.37 m) recorded on September 29, 2017.