USGS Water-Year Summary 2024
310813083260301 18H016
Floridan aquifer system
Upper Floridan Aquifer
LOCATION - Lat 31°08'13", long 83°26'03" referenced to North American Datum of 1927, Cook County, GA, Hydrologic Unit 03110203,
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 865 ft. Upper casing diameter 8 in; top of first opening 207 ft, bottom of last opening 865 ft.
DATUM - Land-surface datum is 240.67 ft above North American Vertical Datum of 1988. Measuring point: top of recorder shelf,original beginning date 20060302, 2.66 ft above land-surface datum, Dec. 1, 1973 to present. The land-surface datum was revised on March 18, 2024, based on an error in the determination of the land-surface datum. Land-surface datum is 240.67 ft above North American Vertical Datum of 1988. Prior to March 18, 2024, the land-surface datum was 241.42 ft above National Geodetic Vertical Datum of 1988.
PERIOD OF RECORD - December 15, 1978 to current year.
COOPERATION - Georgia Department of Natural Resources, Environmental Protection Division.