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Progress report on geology of the Edwards Aquifer, San Antonio area, Texas, and preliminary interpretation of borehole geophysical and laboratory data on carbonate rocks

Open-File Report 76-627

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Abstract

The Edwards aquifer, which is one of the most productive aquifers in the southwestern military installations, and 17 communities in South Texas. San Antonio, which has a population of about 750,000, obtains its entire water supply from the Edwards. The primary purpose of this progress report is to describe the geology and porosity of the rocks of the Edwards aquifer in the San Antonio and to present preliminary interpretations of borehole geophysical and laboratory data. The data were obtained from geophysical and geologic studies of nine cored test holes, from laboratory analyses of samples of aquifer materials, and from recent stratigraphic studies by Rose (1972). The aquifer is areally divided into a fresh-water zone and a saline zone at the ' bad-water ' line. The bad-water line forms the southern boundary of the fresh-water zone and its position is determined by the occurrence of water containing 1,000 mg/liter or more of dissolved solids. Rock characteristics and water chemistry in the fresh-water one differ markedly from those of the saline zone. The high permeability of the aquifer within the fresh-water zone results from open fractures and selectively dissolved facies. (Woodard-USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Progress report on geology of the Edwards Aquifer, San Antonio area, Texas, and preliminary interpretation of borehole geophysical and laboratory data on carbonate rocks
Series title:
Open-File Report
Series number:
76-627
Edition:
-
Year Published:
1976
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
63 leaves :ill. (some fold.) 5 fold. maps ;27 cm.; (94 p. - PGS)