Click
to
hide
Water-Year
Summary
instructions
and
information
- 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.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
390623077314201 50W 4C
Early Mesozoic basin aquifers
Balls Bluff Siltstone
Balls Bluff Siltstone
LOCATION - Lat 39°06'23", long 77°31'42" referenced to North American Datum of 1927, Loudoun County, VA, Hydrologic Unit 02070008, near water towers 0.7 miles east of Rt 15 N/Leesburg Bypass, near Fort Evans Rd.
GROUNDWATER RECORDS
DATUM - Land-surface datum is 383.49 ft above North American Vertical Datum of 1988. Measuring point: TOP OF SHELF, 2.07 ft above land-surface datum, Jul. 20, 2006 to present.
PERIOD OF RECORD - October 1977 to current year.
GAGE - Electronic data logger and pressure transducer, 15-minute record interval. Prior to July 25, 2006, occasional measurement with chalked tape by USGS personnel.
REMARKS - Well is located in slightly metamorphosed Balls Bluff Formation of Late Triassic age. Water level affected by magnitude 5.8 Mineral, VA earthquake on Aug. 23, 2011.
EXTREMES FOR PERIOD OF RECORD - Highest water level recorded, 18.89 ft below land-surface datum, May 15, 2010; lowest measured, 49.06 ft below land-surface datum, Nov. 27, 1985.
