Groundwater Management Groundwater Management Area (GMA) ProcessArea (GMA) Process

and Implementationsand Implementations

TWCA Mid-Year ConferenceTWCA Mid-Year Conference

Galveston, TexasGalveston, Texas

Gary Westbrook, General Manager Post Oak Savannah GCD

Preliminary Desired Future Preliminary Desired Future ConditionsConditions

Groundwater Management Area 12Groundwater Management Area 12

Primarily Based on Water Levels (WL)Primarily Based on Water Levels (WL) Definitive and Direct Measurement of Groundwater (GW)Definitive and Direct Measurement of Groundwater (GW) Reliable and consistentReliable and consistent WL used to calibrate GAMsWL used to calibrate GAMs Key GW issues can be addressed through analysis of WLKey GW issues can be addressed through analysis of WL

Protection of Existing Users (WL compared to well screens)Protection of Existing Users (WL compared to well screens) Change in Aquifer Storage (change in WL x aquifer storativity)Change in Aquifer Storage (change in WL x aquifer storativity) GW-SW interaction (WL compared to bottom of stream)GW-SW interaction (WL compared to bottom of stream) Flow Direction and Amount (application of Darcy’s Law)Flow Direction and Amount (application of Darcy’s Law)

Post Oak Savannah GCDPost Oak Savannah GCDPriorities and ConcernsPriorities and Concerns

Needs of well owners and land owners within Needs of well owners and land owners within GMA 12GMA 12

Improvement of Groundwater Availability Model Improvement of Groundwater Availability Model for GMA 12for GMA 12 Include more available data for calibrationInclude more available data for calibration Improve SW-GW interaction, Recharge, & FaultsImprove SW-GW interaction, Recharge, & Faults

Focus on DFCsFocus on DFCs Define function and purpose of DFCsDefine function and purpose of DFCs Use MAG as guideline, but manage based on DFCUse MAG as guideline, but manage based on DFC

Provides actual evidence of impactsProvides actual evidence of impacts Monitoring Network and ProgramMonitoring Network and Program

Post Oak Savannah Post Oak Savannah GCDGCD

Website: Website: www.posgcd.org Regularly scheduled Board meetings on second Regularly scheduled Board meetings on second

Tuesdays of month @ District office @ 5:30 pmTuesdays of month @ District office @ 5:30 pm Office hours Monday - Friday 8:00 am to 4:00 Office hours Monday - Friday 8:00 am to 4:00

pmpm Phone: 512-455-9900 Fax: 512-455-9909Phone: 512-455-9900 Fax: 512-455-9909 Email: posgcd@tconline.netEmail: posgcd@tconline.net