USGS Water-Year Summary for Site 254157080214002

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	Available Parameters
	72020 Elevation, NGVD29(Max.)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

254157080214002 G 3074. USGS Observation Well near South Miami, FL.

Biscayne aquifer
Biscayne Limestone Aquifer

LOCATION - Lat 25°41'56.75", long 80°21'38.27" referenced to North American Datum of 1983, in NW 1/4 NE 1/4 NW 1/4 sec.32, T.54 S., R.40 E., Miami-Dade County, FL, Hydrologic Unit 03090202, on north side of Snapper Creek Canal, 0.25 mi southeast of the intersection of SW 107th Avenue and Sunset Drive, and 4.6 mi west of South Miami.

REVISIONS HISTORY - Revisions: Groundwater level of 8.47 ft above NGVD 1929, measured on July 22, 1994, was removed on June 15, 2021, after it was determined to be erroneous. Groundwater level of 10.07 ft above NGVD 1929, measured on Aug. 26, 1994, was removed on June 15, 2021, after it was determined to be erroneous. Groundwater level of 5.25 ft above NGVD 1929, measured on March 31, 1995, was removed on June 25, 2021, after it was determined to be erroneous. Groundwater level of -2.93 ft above NGVD 1929, measured on May 24, 2009, was removed on June 25, 2021, after it was determined to be erroneous.

GROUNDWATER RECORDS

WELL CHARACTERISTICS - Depth 40 ft. Upper casing diameter 6 in; top of first opening 40 ft, bottom of last opening 40 ft. [REPLACE AUTOGENERATED TEXT] Drilled, observation, water-table well, depth 40 ft, diameter 6 in.,cased to 40 ft.

DATUM - Land-surface datum is 5 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of flange, 8.17 ft above National Geodetic Vertical Datum of 1929, Apr. 7, 1977 to Oct. 1, 1994; top of base, 8.3 ft above National Geodetic Vertical Datum of 1929, Sep. 28, 1977 to present. Prior to October 2010, the top of base measuring point was incorrectly considered to be 8.22 ft NGVD, and the top of casing was considered to be 8.17 ft NGVD. See REMARKS.

PERIOD OF RECORD - September 1977 to June 2011. Discontinued.

GAGE - Electronic data logger.

REMARKS - Cased interval is obstructed at a depth of 36 ft. The well remains in good communication with the aquifer. In 2010, the top of base measuring point was resurveyed and found to be 8.30 ft NGVD instead of 8.22 ft NGVD, requiring a correction of +0.08 ft for water level elevations published prior to October 2010. See DATUM. Corrected records are available in files of the U.S. Geological Survey. In 2011, well found leaking water into the casing.

EXTREMES FOR PERIOD OF RECORD - Highest daily maximum water level, 7.76 ft NGVD 29, Oct. 15, 1999; lowest, 7.20 ft below NGVD 29, June 14, 2011.