Title:
"Drastic" Mapping to Determine the Vulnerability of Ground-Water to Pollution
"Drastic" Mapping to Determine the Vulnerability of Ground-Water to Pollution
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Author(s)
Trent, Victoria P.
Advisor(s)
Editor(s)
Hatcher, Kathryn J.
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Abstract
The Georgia Geologic Survey Branch of the
Environmental Protection Division, Georgia Department of Natural Resources, in cooperation with the Georgia
District of the U.S. Geological Survey, Water Resources Division, is conducting a project to map the relative susceptibility of Georgia's shallow aquifers to ground-water
pollution. The DRASTIC method developed by the U.S. EPA is being used to develop the maps. DRASTIC is a methodology that allows the pollution potential of any hydrogeologic setting to be systematically evaluated. The
system has two major portions: the designation of mappable units, termed hydrogeologic settings, and the superposition of a relative rating system (Aller, et. al., 1987). DRASTIC is an acronym for the hydrogeologic factors
which influence pollution potential: depth to water (D), net recharge (R), aquifer media (A), soil media (8), topography
(T), impact of the vadose zone media (I), and hydraulic conductivity of the aquifer (C). Each factor is incorporated into a relative rating scheme that uses a combination of weights and ratings to produce a numerical value called the DRASTIC Index (Aller, et. al., 1987). The higher an
area scores on the index, the more vulnerable the specific area is to ground water pollution.
Sponsor
Sponsored by U.S. Geological Survey, Georgia Department of Natural Resources, the University of Georgia, Georgia State University, and Georgia Institute of Technology.
Date Issued
1991
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Resource Type
Text
Resource Subtype
Proceedings