--> Abstract: Dynamic Hydraulic Boundaries Within the Western Edwards Aquifer, by Ron T. Green, Paul Bertetti, Alan Morris, David Ferrill, and Rick Klar; #90078 (2008)
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Dynamic Hydraulic Boundaries Within the Western Edwards Aquifer

Ron T. Green1, Paul Bertetti1, Previous HitAlanTop Morris1, David Ferrill1, and Rick Klar2
1Geosciences and Engineering, Southwest Research Institute, San Antonio, TX
2Raba-Kistner Consulting, San Antonio, TX

The western physical and hydraulic boundaries of the San Antonio segment of the Edwards Aquifer are neither well understood nor well characterized. Recent investigations of the Edwards Aquifer in Kinney and Uvalde counties have provided additional information that offer insight into the dynamic nature of hydraulic structures and barriers that control groundwater flow within the western Edwards Aquifer. This portion of the San Antonio segment of the Edwards Aquifer is subdivided into three pools (1) Kinney, (2) Uvalde, and (3) San Antonio. The western extent of the Kinney pool of the Edwards Aquifer has been determined to be approximately midway between Brackettville and the Val Verde County line, somewhat farther west than previously thought. The Kinney and Uvalde pools are separated by a hydraulic barrier that allows minimal transfer of groundwater from the Kinney pool to the Uvalde pool when groundwater levels are low, but appreciable flow when the level is high. Conversely, the Uvalde pool is connected with the San Antonio pool via the Knippa Gap, a high-capacity channel that allows significant groundwater flow from west to east, but provides sufficient restriction to maintain higher groundwater levels in the Uvalde pool than in the San Antonio pool.

 

AAPG Search and Discover Article #90078©2008 AAPG Annual Convention, San Antonio, Texas