Pilot Recharge Models of the Edwards Aquifer, Texas (original) (raw)

2002

Abstract

The Edwards Aquifer, a karst limestone formation, is the primary source of water supply for the City of San Antonio, Texas and many surrounding communities. Historically, two methods have been applied to calculate recharge to the Edwards Aquifer using a monthly water balance equation. The Edwards Aquifer Authority (EAA), in cooperation of HDR Engineering, Inc. has developed a new method for calculating recharge on a daily timestep using Hydrologic Simulation Program - FORTRAN (HSPF) Release 11, documented by the US. Geological Survey. Pilot recharge models of the Nueces and Blanco River Basins effectively simulate hydrologic and hydraulic processes of rainfall, interception, evaporation, infitration, evapo-transpiration, streamflow, and deep percolation using HSPF modules in order to quantify aquifer recharge. Simulated streamflows for a 40-year historical period are highly correlated with measured streamflows at proximate gage locations used to verify model calibration. Resulting e...

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