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The Edwards aquifer is a karst aquifer system that is a primary water source for a large part of central Texas including the city of San Antonio, Texas. These vector geospatial data represent the geographic extent of the contributing zones for the Northern, Barton Springs, and San Antonio segments of the Edwards aquifer. The contributing zone is defined as the drainage area of the Edwards Plateau that contributes surface water to the Edwards aquifer recharge zone. The recharge zone is where surface water and precipitation infiltrate into the outcrop of the rocks that compose the aquifer (see Ashworth and Hopkins, 1995, and George and others, 2011). References Ashworth, J.B., and Hopkins, Janie, 1995, Aquifers of...
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The extensive development of oil and natural-gas resources in south Texas during the past 10 years has led to questions regarding possible environmental effects of processes associated with oil and natural-gas production, in particular the process of hydraulic fracturing, on water and other natural resources. Part of the lower San Antonio River watershed intersects an area of oil and natural-gas production from the sedimentary rocks that compose the Eagle Ford Group. The rapid expansion of infrastructure associated with oil and natural-gas production increases potential pathways for inorganic and organic contaminants to enter surface-water systems. The U.S. Geological Survey, in cooperation with the San Antonio...


    map background search result map search result map Land-Cover, Surface-Water, and Streambed-Sediment Data Collected Upstream From and Within an Area of Oil and Natural-Gas Production, South Texas, 2008-17 Contributing Zones of the San Antonio, Barton Springs, and Northern segments of the Edwards aquifer Land-Cover, Surface-Water, and Streambed-Sediment Data Collected Upstream From and Within an Area of Oil and Natural-Gas Production, South Texas, 2008-17 Contributing Zones of the San Antonio, Barton Springs, and Northern segments of the Edwards aquifer