Summary Report for the 1998-1999 STATEMAP Project: Geological Mapping to Support Improved Data-Base Development and Understanding of Critical Aquifers of Texas

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1999

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This Texas STATEMAP project focuses on geologic mapping in areas where enhanced geological information can significantly impact development, land use, public education, environmental protection, and the economy. For the 1998-1999 work year, the project was divided into three subprojects. Subproject 1 addressed the third and final year of mapping in several karst aquifer areas experiencing rapid urban growth along the Edwards aquifer and recharge zone. Three map areas comprised subproject 1: West San Antonio, Austin-Georgetown, and Del Rio (Fig. 1). These areas encompass some of the fastest-growing urban regions in Texas, with development further spurred by NAFTA due to the region's proximity to major transportation routes from Mexico. A portion of the Edwards aquifer serves as the sole-source aquifer for San Antonio. Geologic maps of subproject 1 areas offer essential information for water and land resource management and construction practices.

Subproject 2 involved digitally compiling existing geologic maps, originally at a scale of 1:24,000, of the West Hueco Bolson-El Paso region, which were developed for previous STATEMAP projects (Fig. 2; Table 1). The contractual outcome is a color geologic map (digital dataset) at a scale of 1:100,000, covering the West Hueco Bolson-El Paso region in Texas. This digital map holds significance as it serves as a robust geologic foundation and vital dataset for a portion of the Texas-Mexico border area experiencing rapid urban expansion, declining water resources, and environmental pressures due to development. Moreover, the mapped area includes extensive public access lands (such as Franklin Mountains and Hueco Tanks State Parks), whose management stands to benefit from the availability of digital geologic data for planning, development, and enhancing public awareness of geological processes and history.

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