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| MD-DE-DC Water Science Center |
U.S. GEOLOGICAL SURVEY
Open-File Report 01-210
This report presents a map showing the potentiometric surface of the Lower Patapsco aquifer in the Patapsco Formation of Cretaceous age in Southern Maryland during September 1999. The map is based on water-level measurements in 66 wells. The potentiometric surface was 87 feet above sea level near the northwestern boundary and outcrop area of the aquifer in a topographically high area of Anne Arundel County, and 109 feet above sea level in a similar setting in Prince Georges County. From these high areas, the potentiometric surface declined towards large well fields at Severndale, Arnold, and Annapolis. The ground-water levels declined to 92 feet below sea level at Severndale, 33 feet below sea level at Arnold, and 32 feet below sea level west of Annapolis. There was also a cone of depression covering a large area in Charles County that includes Waldorf, LaPlata, Indian Head and the Morgantown power plant. The ground-water levels were as low as 157 feet below sea level at Waldorf, 107 feet below sea level at LaPlata, 113 feet below sea level at Indian Head, and 85 feet below sea level at the Morgantown power plant.
This report is available as a gif file (Large Print Size) and in Portable Document Format (PDF)(8½ x 11 printed size).
View the report in GIF (187 KB)
View the report in PDF (124 KB)
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:
Director
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: http://md.water.usgs.gov/.
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