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Open-File Report 2010–1203

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

Potentiometric Surface of the Magothy Aquifer in Southern Maryland, 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 (450 KB)


This report presents a map showing the potentiometric surface of the Magothy aquifer in the Magothy Formation of Late Cretaceous age in Southern Maryland during September 2009. The map is based on water-level measurements in 66 wells. The highest measured water level was 85 feet above sea level near the northern boundary and outcrop area of the aquifer in the north-central part of Anne Arundel County.

The potentiometric surface declined towards the south. Local hydraulic gradients were directed toward the center of a cone of depression in the Waldorf area that developed in response to pumping. Measured groundwater levels were as low as 71 feet below sea level in the Waldorf area. 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, Potentiometric surface of the Magothy aquifer in Southern Maryland, September 2009: U.S. Geological Survey Open-File Report 2010–1203, 1 sheet, available at

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