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USGS Water-Year Summary 2024
331145092413001 17S15W31DCB1
Mississippi embayment aquifer system
Sparta Sand
Sparta Sand
LOCATION - Lat 33°11'49.05", long 92°41'27.01" referenced to North American Datum of 1983, in NW 1/4 SW 1/4 SE 1/4 sec.31, T.17 S., R.15 W., Union County, AR, Hydrologic Unit 08040202,
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 260 ft. Upper casing diameter 4 in; top of first opening 250 ft, bottom of last opening 260 ft.
DATUM - Land-surface datum is 258 ft above North American Vertical Datum of 1988. Measuring point: MP TOP OF CASING, 1.63 ft above land-surface datum, Aug. 19, 1982 to Apr. 25, 2018; PVC was shortened new mp top edge of casing on east side of 4 inch PVC, marked, 0.15 ft above land-surface datum, Apr. 24, 2018 to present; Top edge of PVC coupler after removing threaded cap, 4.51 ft above land-surface datum, Jul. 5, 2018 to present.
GAGE -
Land Surface Datum of Well is 253.16 ft above NAVD of 1988, (Reference Frame NAD_83 (2011) (EPOCH:2010.0000) GEOID18). (Tape up to MP = 4.4 ft). LSD = Grounding Rod (253.661 ft - 0.500 ft).
Prior to September 05, 2024, the datum of Well was 258.00 ft NAVD of 1988. However, was selected from a DEM with an accuracy of 4.3 ft.
