1. Management of Groundwater Resources
in the Central Carrizo-Wilcox Area
Texas Groundwater Summit
Presented by:
Gary Westbrook,
General Manager Post Oak Savannah GCD
August 29, 2012
Serving the citizens of Milam and Burleson Counties

3. Summary of POSGCD Management Strategies
Aquifer/Formation Over all DFC DFC- Unconfined Area
Sparta 30 10
Queen City 30 10
Carrizo 65 20
Calvert Bluff 140 20
Simsboro 300 20
Hooper 180 20
Yegua/Jackson 100 15
(These DFCs are expressed as average drawdowns for a 60-year period beginning January 2000 and
ending December 2059, for the area covered by each aquifer in Milam and Burleson Counties.)

4. Adopted DFCs: Expressed in Average across District
Simsboro (2000 to 2060)
300 ft
237 ft
270 ft 115 ft
N/A ft

6. GCD Management Choices
• How will GCD manage groundwater resources, i.e.,
how will GCD evaluate permit applications?
• Based on MAG, DFC, Amount Permitted (Cap),
Actual Production, District Philosophy?
BIG QUESTION TO ASK-
What actually affects aquifer conditions & water
levels?
Permitted Amounts? No.
MAGs? No.
Actual Production (which fluctuates)? Yes. 6

7. Simsboro- Permitted vs. Produced
Average 2008-2011 (acre-ft)
21215
10531
Permitted Produced
**Does not include BWS amounts of 55,993 A/F permitted, or 584 A/F produced

8. POSGCD Management
• Focus on aquifer conditions through monitoring wells
– District’s adopted DFCs
– District’s thresholds for amendments to strategies
• Equitably respects private property rights in
groundwater while protecting water levels in aquifer
• Equitable distribution of resource at any given time-
All applications equitably approved (spacing/acreage)
• Includes equitable curtailment of permits if necessary,
based on allowable production/acre
• How is this possible?.....Time is on our side.
8

9. POSGCD Simsboro
Predicted Drawdown Over Time
Year 2020 2040 2060
Drawdown 196 254 306
Note: Draft work in progress; all results are preliminary.
Average Drawdown over entire District from year 2000 to 2060

10. Questions?
Contact info:
Gary Westbrook
General Manager
Post Oak Savannah GCD
Phone: 512-455-9900
Fax: 512-455-9909
Email: gwestbrook@posgcd.org
Website: www.posgcd.org
Serving the Citizens of Milam and Burleson Counties