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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
GCD Panel - Management Strategies (East/Central Texas), Gary Westbrook
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.)
Adopted DFCs: Expressed in Average across District
           Simsboro (2000 to 2060)




                  300 ft
       237 ft
                           270 ft      115 ft


  N/A ft
GCD Panel - Management Strategies (East/Central Texas), Gary Westbrook
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
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
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
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
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

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GCD Panel - Management Strategies (East/Central Texas), Gary Westbrook

  • 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