Ground-Water Resources and Model Applications for the Edwards (Balcones Fault Zone) Aquifer in the San Antonio Region, Texas

摘要

The purpose of this investigation was to determine the occurrence, availability, and dependability of the Edwards (Balcones Fault Zone) Aquifer in the Nueces, San Antonio, Guadalupe-Blanco River basins and to develop a ground water resources management tool for use in a total water-resource management program for the three river basins. The scope of the study was primarily directed toward the quantitative aspects of ground-water withdrawals, spring flows, and aquifer characteristics. Also included within the scope of this study was the simultaneous initiation of the Edwards test well drilling investigation. The objectives of this investigation were: (a) to describe the lithology of the stratigraphic units which make up the Edwards (Balcones Fault Zone) aquifer; (b) to determine the upper and lower hydrologic boundaries; (c) to determine the average total porosity for various aquifer levels; and (d) to determine the average effective porosity (specific yield) and the approximate artesian storage values for the aquifer through core analysis.