Fact Sheet 2013–3078
The freshwater zone of the San Antonio segment of the Edwards aquifer is used by residents of San Antonio and numerous other rapidly growing communities in south-central Texas as their primary water supply source. This freshwater zone is bounded to the south and southeast by a saline-water zone with an intermediate zone transitioning from freshwater to saline water (transition zone). As demands on this water supply increase, there is concern that the transition zone could potentially move, resulting in more saline water in current freshwater supply wells. Since 1985, the U.S. Geological Survey, San Antonio Water System, and other Federal and State agencies have conducted studies to better understand the transition zone.
First posted September 30, 2013
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Thomas, J.V., and Stanton, G.P., 2013, Borehole geophysical, fluid, and hydraulic properties within and near the freshwater/saline-water transition zone, San Antonio segment of the Edwards aquifer, south-central Texas, 2010–11: U.S. Geological Survey Fact Sheet 2013–3078, 6 p., http://pubs.usgs.gov/fs/2013/3078/.
Description of Transects and Monitoring Wells
Borehole Geophysical, Fluid, and Hydraulic Properties
Hydraulics of Lateral Flow