Edwards Aquifer Recharge Modeling

Client: Edwards Aquifer Authority, San Antonio, TX and U.S. Army Corps of Engineers, Fort Worth, TX

Clear Creek Solutions provided hydrologic modeling services to the Edwards Aquifer Authority of San Antonio, Texas including:

  • Computation of recharge to the Edwards Aquifer.
  • Comparison of recharge estimates based on different precipitation data sources.
  • Reviewing and analyzing results.
  • Creating a Windows-version of HSPF for the nine major basins that cross the Edwards Aquifer.

Process and Solution

Comparative analyses were made to determine the preferred precipitation data set for the model.

The comparative analyses focused on the computation of recharge using the National Weather Service (NWS) precipitation data as well as the NEXRAD radar data.

For the NWS data, we augmented precipitation with the Authority's Real-Time Network hourly precipitation data where needed

Result

The evaluation of the analyses found that the NWS hourly precipitation data produced more accurate simulated streamflow data. In turn, this produced more accurate recharge estimates than the NEXRAD daily precipitation data.

Clear Creek Solutions also trained the Edwards Aquifer Authority staff on how to use HSPF hydrology and hydraulics software.

This information assisted Authority staff in the evaluation of alternative solutions to increase groundwater recharge.

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