Center for Spatial Analysis Technologies

Most Significant Recharge Areas

Description This database identifies approximately 13,000 square miles (23 percent) of Georgia's land surface through which the most significant natural ground-water recharge occurs, as described in Georgia Geologic Survey Hydrologic Atlas 18: "Most Significant Ground-Water Recharge Areas of Georgia," published in 1989. Mapping of the recharge areas was based on outcrop area, lithology, soil type and thickness, slope, density of lithologic contacts, geologic structure, the presence of karst, and potentiometric surfaces. This database was intended to delimit those recharge areas where the State of Georgia should direct ground-water protection efforts. Potential users of this database are advised of the following specific cautions: 1.) Mapping at the 1:500,000 scale means that only the larger recharge areas could be included. Important smaller recharge areas cannot be shown at this scale; 2.) Since about nine-tenths of the land surface of Georgia is a recharge area, the limit of 23 percent on the most significant recharge areas is arbitrary. Areas not mapped may be locally or regionally significant. 3.) Areas mapped as recharge areas may include small areas of impermeable soils that limit recharge. The data source for the GIS database was the publication mylars (black separate linework) from Hydrologic Atlas 18.
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U.S. Department of the Interior | U.S. Geological Survey
URL: http://csat.er.usgs.gov/statewide/layers/recharge.html
Page Contact Information: webmaster-ga@usgs.gov
Page Last Modified: Wednesday, 07-Jun-2006 16:54:18 EDT