Simulation of flow in the Edwards Aquifer, San Antonio region, Texas, and refinement of storage and flow concepts

Purpose and scope 3 Approach 3 Physiographic and hydrologic setting 4 Acknowledgments 5 Geologic framework 5 Rock properties 5 Structural properties 9 Hydrogeologic framework 12 Hydrology 12 Hydraulic characteristics 17 Initial storage and flow concepts 17 Mathematical model 20 Representation of the aquifer 21 Hydrologic data 23 Hydrogeologic data 23 Simulation of flow 26 General description of simulations 26 Selected simulation 27 Refinement of storage and flow concepts 31 Delineation of storage units 31 Delineation of flow units 36 Identification of possible flow across external boundaries 36 Description of geologic structures that restrict and convey ground water 38 Topics for future investigation 42 Summary and conclusions 44