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USGS Water-Year Summary 2024
281202081391701 PO-1 Thornhill Deep Well near Davenport, FL.
Floridan aquifer system
Floridan Aquifer System
Floridan Aquifer System
LOCATION - Lat 28°12'02", long 81°39'17" referenced to North American Datum of 1927, in SE 1/4 SW 1/4 SW 1/4 sec.19, T.26 S., R.19 E., Polk County, FL, Hydrologic Unit 03080102, on dirt road 0.8 mi east of State Highway 27, and 2.0 mi south of the intersection State Highway 27 and Interstate Highway 4 and 4.2 mi northwest of Davenport. Owner: St. Johns River Water Management District.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 151 ft. Upper casing diameter 4.0 in; top of first opening 108 ft, bottom of last opening 151 ft. Drilled, observation, unused, cased to 108 ft.
DATUM - Land-surface datum is 133.21 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of recorder shelf, 2.25 ft above land-surface datum, Oct. 1, 2012, to present. Top of recorder shelf, 2.20 ft above land-surface datum, May 18, 1983 to Mar. 26, 2007.
PERIOD OF RECORD - May 1983 to October 1985 (semiannually); October 1985 to September 1996; October 1996 to September 2001 (semiannually); October 2001 to March 2007 (monthly); April 2007 to June 2015 (discontinued).
GAGE - Water-stage recorder and data-collection platform--60-minute interval.
EXTREMES FOR PERIOD OF RECORD - Highest water level measured, 129.06 ft above NGVD of 1929, Sept. 12, 1983; lowest measured, 118.90 ft above NGVD of 1929, May 16, 2001.
