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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
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USGS Water-Year Summary 2024
410628073413301 GW 21
New York and New England carbonate-rock aquifers
Carbonate Crystalline Bedrock
Carbonate Crystalline Bedrock
LOCATION - Lat 41°06'28.4", long 73°41'32.6" referenced to North American Datum of 1983, Fairfield County, CT, Hydrologic Unit 01100006, 0.9 mi north of intersection of Riversville Rd. and John St., 250 ft south of Sterling Rd. and 360 ft east of Riversville Rd., Greenwich; Glenville quadrangle.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 350 ft. Upper casing diameter 6 in; top of first opening 18.7 ft, bottom of last opening 350 ft. Bored, unused, water-table well, steel casing 18.7 ft below land surface, open hole.
DATUM - Land-surface datum is 465.11 ft above North American Vertical Datum of 1988. Measuring point: Old MP, 1.28 ft above land-surface datum, Oct. 5, 2001 to Apr. 5, 2002; Black arrow on steel casing, 1.28 ft above land-surface datum, Apr. 4, 2002 to present; Black arrow on steel casing, 466.39 ft above land-surface datum, Nov. 4, 2016 to present. Prior to Nov. 4, 2016, land-surface datum was reported as 465 ft above National Geodetic Vertical Datum of 1929, from topographic map.
PERIOD OF RECORD - Nov. 20, 2001 to current year (continuous). Oct. 5, 2001 to Nov. 20, 2001, measurements made monthly.
GAGE - Submersible pressure transducer/data logger Nov. 20, 2001 to Nov. 27, 2007; submersible direct-read transducer Nov. 27, 2007 to current year, collects 1-hour water-level data. Oct. 2001 to current year measurements made monthly or bimonthly with an electric tape. All measurements made by USGS personnel. Satellite telemetry at station.
EXTREMES FOR PERIOD OF RECORD - Highest water level measured, 16.03 ft below land-surface datum, Apr. 17, 2007 (recorded); lowest water level measured, 52.49 ft below land-surface datum on Oct. 23, 2007 (measured), but may have been lower during period of missing record, Oct. 1 - Dec. 7, 2007.
