Potentiometric surface of the lower Potomac Aquifer in Virginia, 1993

Ground-water level measurements from 17 wells in the lower Potomac aquifer in the Coastal Plain Physiographic Province of Virginia in 1993 were used to prepare a map of the potentiometric surface of the aquifer. The map shows the potentiometric surface of the lower Potomac aquifer indicating a regional trend toward the Chesapeake Bay and Atlantic Ocean. The potentiometric-surface data indicate that there are two cones of depression, one around well fields in Henrico County and the other around large well fields in Isle of Wight County and Franklin, Virginia. The highest ground-water-level measurement was 47 feet above sea level in southeast Southampton County, and the lowest ground-water-level measurement was 161 feet below sea level in the southeast area of Isle of Wight County near Franklin, Virginia.