In cooperation with the Bexar-Medina-Atascosa Counties Water Control and Improvement District No. 1, Bexar Metropolitan Water District, Texas Water Development Board, and Edwards Aquifer Authority Hydrogeology, Hydrologic Budget, and Water Chemistry of the Medina Lake Area, Texas Water-Resources Investigations Report 00-4148 Cover: Medina Dam and Medina Lake, August 1994. (Photograph by Ted A. Small, U.S. Geological Survey.) U.S. Department of the Interior U.S. Geological Survey Hydrogeology, Hydrologic Budget, and Water Chemistry of the Medina Lake Area, Texas By Rebecca B. Lambert, Kenneth C. Grimm, and Roger W. Lee U.S. GEOLOGICAL SURVEY Water-Resources Investigations Report 00–4148 In cooperation with the Bexar-Medina-Atascosa Counties Water Control and Improvement District No. 1, Bexar Metropolitan Water District, Texas Water Development Board, and Edwards Aquifer Authority Austin, Texas 2000 U.S. DEPARTMENT OF THE INTERIOR Bruce Babbitt, Secretary U.S. GEOLOGICAL SURVEY Charles G. Groat, Director Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. For additional information write to District Chief U.S. Geological Survey 8027 Exchange Dr. Austin, TX 78754–4733 E-mail:
[email protected] Copies of this report can be purchased from U.S. Geological Survey Branch of Information Services Box 25286 Denver, CO 80225–0286 E-mail:
[email protected] ii CONTENTS Abstract ...............................................................................................................................................................................