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Geohydrology of Fractured Crystalline Rock of Northern Georgia

Project Chief: Lester J. Williams
Cooperator: Coweta County, Forsyth County, Oconee County, Rockdale County, Troup County
Year started: 2007


Map of the study area

Groundwater development and use in the fractured crystalline rocks of northern Georgia are critical to sustain population growth and economic development. Knowledge about ground-water movement, storage, vulnerability, quality, and connection with surface-water resources is limited because of the complexity of fractured-rock aquifers that underlie the region. A better understanding of the relation between the complex geology and ground-water resources in these areas is needed for water-resource managers and planners to develop effective management strategies and optimize available supply for future use.


The primary objective is to evaluate the occurrence and quality of ground water in fractured crystalline rock of the Piedmont and Blue Ridge physiographic provinces of northern Georgia. Specific objectives are to:

  • Compile existing information on geology and wells.
  • Conduct a field inventory of existing wells to verify construction, yield, and location.
  • Collect borehole geophysical and flowmeter logs to determine depth, yield, and geologic and water-quality characteristics of water-bearing intervals.
  • Evaluate geologic, well, and borehole geophysical data to identify geologic settings favorable for the development of sustainable water supplies.
  • Establish a ground-water-level monitoring network for northern Georgia.
  • Develop and maintain a comprehensive geohydrologic database of well and geophysical data.

This investigation provides information to help guide future ground-water development and water-management decisions for local communities while enhancing understanding of the hydrogeology of fractured rocks in the southern Piedmont and Blue Ridge physiographic provinces. Data from this study are entered into the USGS National Water Information System (NWIS) and are available on the Web at


Well Inventory and Geophysical Logging of Selected Wells in Troup County, Georgia, 2007—2008 This report is available online only in pdf format (2 Mb): U.S. Geological Survey Scientific Investigations Map 3058, 1 page Note: This report is a poster that is 42 inches wide by 32 inches high.

Johnson, Carole D.,Williams, John H., and Williams, Lester J., Hydraulic logging methods--A summary of field methods used in fractured bedrock systems, Georgia (231 kb PDF file)

Khallouf, Donna D., and Lester J. Williams, Structural and lithologic controls on ground-water availability in a granite and biotite gneiss in the Conyers, Georgia, area (204 kb PDF file)

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