Potentiometric Surface of the Lower Patapsco Aquifer in Southern Maryland, September 1999
By Curtin, S.E., Andreasen, D.C., and Wheeler, J.C.
Abstract
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.
