USGS Water-Year Summary 2023
182445066043401 1154. PIEZOMETER ALSACIA II-6 SAN JUAN, PR
North Coast Limestone aquifer system (Puerto Rico)
Valley Alluvium
LOCATION - Lat 18°24'45", long 66°04'34" referenced to North American Datum of 1927, San Juan Municipio, PR, Hydrologic Unit 21010005, 0.28 mi (0.45 km) northeast of Dr. Pedreira School, 3.52 mi (5.66 km) southeast of CataƱo plaza, and 0.53 mi (0.85 km) south of Hiram Bithorn Stadium main gate; Name: Piezometer Alsacia II - 6, San Juan, PR.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 27 ft. Upper casing diameter 4 in; top of first opening 21 ft, bottom of last opening 27 ft.
DATUM - Land-surface datum is 11.5 ft above National Geodetic Vertical Datum of 1929. Measuring point: Instrument Table, 7.92 ft above National Geodetic Vertical Datum of 1929, Jul. 6, 1989 to Nov. 22, 2006; Top of Steel Pipe, 8.3 ft above National Geodetic Vertical Datum of 1929, Dec. 14, 2006 to Dec. 10, 2008; TOP OF STEEL PIPE, 8.02 ft above National Geodetic Vertical Datum of 1929, Dec. 10, 2008 to present.
PERIOD OF RECORD - July 6, 1989 to November 27, 1991, January 15, 1993 to current year.
COOPERATION - Funding for site provided by the Puerto Rico Department of Natural and Environmental Resources and the US Geological Survey.
EXTREMES FOR PERIOD OF RECORD - Highest water level measured, 0.89 ft., below land-surface datum, December 19, 1990; lowest water level measured, 12.12 ft., below land-surface datum, September 14, 1994.