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

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 20Calvert 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.)

Adopted DFCs: Expressed in Average across District

Simsboro (2000 to 2060)

237 ft

N/A ft

300 ft

270 ft 115 ft

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-BIG QUESTION TO ASK-

What actually affects aquifer conditions & water

levels?

Permitted Amounts? No.

MAGs? No.

Actual Production (which fluctuates)? Yes.6

21215

Simsboro- Permitted vs. Produced

Average 2008-2011 (acre-ft)

10531

Permitted Produced

**Does not include BWS amounts of 55,993 A/F permitted, or 584 A/F produced

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 aquifergroundwater 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

POSGCD Simsboro

Predicted Drawdown Over Time

Year 2020 2040 2060

Note: Draft work in progress; all results are preliminary.

Average Drawdown over entire District from year 2000 to 2060

Year 2020 2040 2060

Drawdown 196 254 306

Questions?

Contact info:

Gary WestbrookGary Westbrook

General Manager

Post Oak Savannah GCD

Phone: 512-455-9900

Fax: 512-455-9909

Email: gwestbrook@posgcd.org

Website: www.posgcd.orgServing the Citizens of Milam and Burleson Counties