Altitude and configuration of the potentiometric surface in the Lower White Clay Creek and Upper Christina River Basins including portions of Franklin, London Britain, New Garden, and New London Townships, Chester County, Pennsylvania, June through Septem

Since 1984, the U.S. Geological Survey (USGS) has been mapping the altitude and configuration of the potentiometric surface in Chester County as part of an ongoing cooperative program to measure and describe the water resources of the county.  Areas where the potentiometric surface has been mapped are shown on figure 1.  These maps can be used to determine the general direction of ground-water flow and are frequently referenced by municipalities and developers to evaluate ground-water conditions for water supply and resource-protection requirements (Wood, 1998).