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USGS Water-Year Summary 2023
261735080534001 HE 861. USGS Observation Well near Immokalee, FL.
Intermediate aquifer system
Tamiami Formation
Tamiami Formation
LOCATION - Lat 26°18'09", long 80°53'35" referenced to North American Datum of 1927, in NW 1/4 NE 1/4 NW 1/4 sec.24, T.48 S., R.34 E., Hendry County, FL, Hydrologic Unit 03090202, 35 ft south of County Road 833, 0.75 mi west of the Broward County line and 5.2 mi east of the Big Cypress Forest Office.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 70 ft. Upper casing diameter 4 in; top of first opening 37 ft, bottom of last opening 70 ft.
DATUM - Land-surface datum is 14.88 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of casing, 17.2 ft above National Geodetic Vertical Datum of 1929, Sep. 1, 1977 to Nov. 24, 1983; Arbitrary datum, 20 ft NGVD, uncorrected, 9.28 ft above National Geodetic Vertical Datum of 1929, Jan. 1, 1978 to Oct. 1, 1978; Top of casing, 14.42 ft above National Geodetic Vertical Datum of 1929, Nov. 4, 1985 to Jan. 25, 1994; top of shelf, 17.96 ft above National Geodetic Vertical Datum of 1929, Jan. 24, 1994 to Jul. 9, 2009; top of casing, 17.88 ft above National Geodetic Vertical Datum of 1929, Jul. 8, 2009 to present. See REMARKS.
PERIOD OF RECORD - September 1977 to November 1977 (monthly), December 1977 to September 1983 (daily), November 1985 to September 1994 (monthly), October 1994 to July 1995 (quarterly), May 2001 to current year.
GAGE - Electronic data logger.
REMARKS - Measuring point elevations from November 1985 to October 1988 were originally based on a land-surface elevation estimated from a topographic map. The figures of water level as elevation, in feet NGVD, prior to September 1987 are in error. A -0.58 ft correction has been applied to correct the water-level data. See DATUM. Records of water levels prior to October 1985 are available in files of the U.S. Geological Survey. Station reconstructed January 25, 1994, July 8, 2009.
EXTREMES FOR PERIOD OF RECORD - Highest water level,15.75 ft NGVD, Aug. 24, 25, 1978 (present datum); lowest measured, 6.87 ft NGVD, May 26, 1981 (present datum).
