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Potentiometric surface of the Upper Patapsco aquifer in southern Maryland, September 2009

December 7, 2010

This report presents a map showing the potentiometric surface of the upper Patapsco aquifer in the Patapsco Formation of Early Cretaceous age in Southern Maryland during September 2009. The map is based on water-level measurements in 65 wells. The highest measured water level was 118 feet above sea level near the northern boundary and outcrop area of the aquifer in northern Anne Arundel County. From this area, the potentiometric surface declined to the south toward a well field in the Annapolis-Arnold area, and from all directions toward three additional cones of depression. These cones are located in the Waldorf-La Plata area, Chalk Point, and the Leonardtown-Lexington Park area. The lowest measured groundwater levels were 26 feet below sea level at Annapolis, 108 feet below sea level south of Waldorf, 60 feet below sea level at Chalk Point, and 83 feet below sea level at Leonardtown. The map also shows well yield in gallons per day for 2008 at wells or well fields.

Publication Year 2010
Title Potentiometric surface of the Upper Patapsco aquifer in southern Maryland, September 2009
DOI 10.3133/ofr20101205
Authors Stephen E. Curtin, David C. Andreasen, Andrew W. Staley
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Open-File Report
Series Number 2010-1205
Index ID ofr20101205
Record Source USGS Publications Warehouse
USGS Organization Maryland Water Science Center