USGS Water-Year Summary 2023
384333076394701 CA Bb 27
Northern Atlantic Coastal Plain aquifer system
LOCATION - Lat 38°43'34.0", long 76°39'48.2" referenced to North American Datum of 1983, Calvert County, MD, Hydrologic Unit 02060006, at Dunkirk Regional Park, Dunkirk.
WELL CHARACTERISTICS - Depth 320 ft. Upper casing diameter 4 in; top of first opening 310 ft, bottom of last opening 320 ft. Drilled, observation, artesian well.
DATUM - Land-surface datum is 137.87 ft above National Geodetic Vertical Datum of 1929. Measuring point: unknown, 2.3 ft above land-surface datum, Aug. 3, 1979 to Sep. 6, 1990; Top of casing, 1.8 ft above land-surface datum, Oct. 19, 1990 to Feb. 10, 2004; Top of recorder shelter platform, 3.15 ft above land-surface datum, Feb. 9, 2004 to Sep. 16, 2005; Top of 4 in casing, 2.97 ft above land-surface datum, Oct. 19, 2005 to present.
PERIOD OF RECORD - August 1979 to current year.
GAGE - Water Years 2014-2022: records good.
For Water Year 2013 and prior years' accuracy statements can be found in Annual Water Data Reports.
Water-level measurements by U.S. Geological Survey personnel. Equipped with digital water-level recorder from February 2004 to current year.
EXTREMES FOR PERIOD OF RECORD - Highest water level measured, 4.05 ft above sea level, (133.82 feet below land surface) May 6, 1980; lowest measured, 49.19 ft below sea level, (187.06 feet below land surface) August 19, 2007 (recorder).