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Groundwater Management Area (GMA) Process and Implementations

This presentation at the TWCA Mid-Year Conference in Galveston, Texas, by Gary Westbrook, General Manager of Post Oak Savannah GCD, discusses the preliminary desired future conditions (DFC) for Groundwater Management Area 12. The focus is on utilizing direct groundwater measurements and water levels (WL) to address key groundwater issues, protecting existing users, and improving groundwater availability through enhanced data calibration, modeling, and understanding groundwater-surface water interactions. Regular Board meetings and collaboration are emphasized for effective groundwater management.

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Groundwater Management Area (GMA) Process and Implementations

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  1. Groundwater Management Area (GMA) Processand Implementations TWCA Mid-Year Conference Galveston, Texas Gary Westbrook, General Manager Post Oak Savannah GCD

  2. Preliminary Desired Future ConditionsGroundwater Management Area 12 • Primarily Based on Water Levels (WL) • Definitive and Direct Measurement of Groundwater (GW) • Reliable and consistent • WL used to calibrate GAMs • Key GW issues can be addressed through analysis of WL • Protection of Existing Users (WL compared to well screens) • Change in Aquifer Storage (change in WL x aquifer storativity) • GW-SW interaction (WL compared to bottom of stream) • Flow Direction and Amount (application of Darcy’s Law)

  3. Post Oak Savannah GCDPriorities and Concerns • Needs of well owners and land owners within GMA 12 • Improvement of Groundwater Availability Model for GMA 12 • Include more available data for calibration • Improve SW-GW interaction, Recharge, & Faults • Focus on DFCs • Define function and purpose of DFCs • Use MAG as guideline, but manage based on DFC • Provides actual evidence of impacts • Monitoring Network and Program

  4. Post Oak Savannah GCD • Website: www.posgcd.org • Regularly scheduled Board meetings on second Tuesdays of month @ District office @ 5:30 pm • Office hours Monday - Friday 8:00 am to 4:00 pm • Phone: 512-455-9900 Fax: 512-455-9909 • Email: posgcd@tconline.net

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