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Open-File Report 2010–1206

Prepared in cooperation with the Maryland Geological Survey and the
Maryland Department of Natural Resources

The Difference Between the Potentiometric Surfaces of the Upper Patapsco Aquifer in Southern Maryland, September 1990 and September 2009

By Stephen E. Curtin,1 David C. Andreasen,2 and Andrew W. Staley2

1U.S. Geological Survey, Baltimore, MD 21228.
2Maryland Geological Survey, Baltimore, MD 21218.
Thumbnail of front cover and link to report (449 KB)


This report presents a map showing the change in the potentiometric surface of the upper Patapsco aquifer in the Patapsco Formation of Early Cretaceous age in Southern Maryland between September 1990 and September 2009. The map, based on water-level differences obtained from 33 wells, shows that during the 19-year period, the change in the potentiometric surface ranged from zero at the edge of the outcrop area in northern Anne Arundel County to a decline of 20 feet at Broad Creek, 16 feet near Arnold, 32 feet at Waldorf, 37 feet at the Chalk Point power plant, and 43 feet at Lexington Park. The map also shows well yield in gallons per day for 2008 at wells or well fields.

First posted January 2011

For additional information, please contact:

U.S. Geological Survey
MD-DE-DC Water Science Center
5522 Research Park Drive
Baltimore, MD 21228
(443) 498-5500

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Acrobat® Reader, free of charge.

Suggested citation:
Curtin, S.E., Andreasen, D.C., and Staley, A.W., 2010, The difference between the potentiometric surfaces of the Upper Patapsco aquifer in southern Maryland, September 1990 and September 2009: U.S. Geological Survey Open-File Report 2010–1206, 1 sheet, available at

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