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USGS Water-Year Summary 2024
132813144472771 A-16, Barrigada, Guam
Other aquifers
Limestone
Limestone
LOCATION - Lat 13°28'16.9", long -144°47'33.1" referenced to North American Datum of 1983, Guam County, GM, Hydrologic Unit 22010000, at Carbullido School, 0.6 mi west of junction of Routes 8 and 10, Barrigada.
REVISIONS HISTORY - Water Level on April 26, 2017 was approved with an incorrect time of 1504. The time was corrected to 1704 on May 22, 2018 by HAJ.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 229 ft. Upper casing diameter undefined; top of first opening undefined, bottom of last opening undefined. Drilled basal water-table well, depth reported 215 ft, diameter 12 in.
DATUM - Land-surface datum is 207.45 ft above undefined vertical datum. Measuring point: top of steel casing, 208.0 ft above Local Mean Sea Level, Dec. 29, 1977 to Mar. 7, 2008; top of steel casing, west side, near door, 207.72 ft above Guam Vertical Datum of 2004, Mar. 6, 2008 to present; Top of casing on stainless steel bracket, marked with black triangle, 209.03 ft above Guam Vertical Datum of 2004, Aug. 13, 2021 to present; Black sharpie triangle on top of stainless steel well cap bracket, south side. Altitude determined from leveling survey in May 2024, 209.05 ft above Guam Vertical Datum of 2004, Jan. 14, 2022 to present. Previous measuring point altitude: 208.00 feet above mean sea level. Water level elevations are referenced to the Guam Vertical Datum of 2004 (GUVD04) beginning March 6, 2008.
PERIOD OF RECORD - Water level: June 1974 to current year.
PERIOD OF DAILY RECORD - April 1975 to current year.
EXTREMES FOR PERIOD OF RECORD -
Highest discrete water level: 7.30 ft above GUVD04 on 2004-07-01.
Lowest discrete water level: 3.04 ft above GUVD04 on 1983-01-24 and 1991-05-15.
