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Open-File Report 99-88

The Difference Between the Potentiometric Surfaces of the Lower Patapsco Aquifer, September 1990 and September 1997 in Southern Maryland

By Curtin, S.E., Andreasen, D.C., and Mack, F.K.


This report presents a map that shows the change in the potentiometric surface of the Lower Patapsco aquifer in the Lower Patapsco Formation of Cretaceous age in Southern Maryland for September 1990 and September 1997. The map, based on water-level measurements in 53 wells, shows that the change of the potentiometric surface during the 7-year period ranged from rises of 8 feet at Indian Head and 1 foot near the outcrop area in Glen Burnie to declines of 39 feet at Arnold, 37 feet at Waldorf, and 37 feet at Morgantown.

This report is available as a GIF file (Large Print Size) and in Portable Document Format (PDF)(8½ x 11 printed size).

View the OFR 99-88 report in GIF (196 KB)

View the OFR 99-88 report in PDF (627 KB)

This report is available online in Portable Document Format (PDF). If you do not have the Adobe Acrobat PDF Reader, it is available for free download from Adobe Systems Incorporated.

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For more information about USGS activities in Maryland, Delaware and the District of Columbia contact:

MD-DE-DC Water Science Center
U.S. Geological Survey
8987 Yellow Brick Road
Baltimore, MD 21237

Telephone: (410) 238-4200
Fax: (410) 238-4210

or access the USGS Water Resources of Maryland, Delaware, and District of Columbia home page at:

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