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Open-File Report 2010–1204

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

The Difference Between the Potentiometric Surfaces of the Magothy Aquifer in Southern Maryland, September 1975 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 (461 KB)


This report presents a map showing the change in the potentiometric surface of the Magothy aquifer in the Magothy Formation of Late Cretaceous age in Southern Maryland between September 1975 and September 2009. The map, based on water-level differences obtained from 48 wells, shows that during the 34-year period, the potentiometric surface had little change at the outcrop area, which is in the northernmost part of the study area, but declined 75 feet at Waldorf. Waldorf is located near the southwesternmost part of the study area, and approaches the downdip boundary of the aquifer. The map also shows well yield in gallons per day for 2008 at wells or well fields.

First posted January 2010

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 Magothy aquifer in Southern Maryland, September 1975 and September 2009: U.S. Geological Survey Open-File Report 2010–1204, 1 sheet, available at

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