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Joint Planning in Groundwater Management Area 12

Joint Planning in Groundwater Management Area 12. Bill Hutchison, Ph.D., P.E., P.G. Director, Groundwater Resources Texas Water Development Board Lost Pines GCD Meeting November 18, 2009. Topics. Overview Desired Future Condition Discussion Groundwater Budget of GMA 12

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Joint Planning in Groundwater Management Area 12

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  1. Joint Planning in Groundwater Management Area 12 Bill Hutchison, Ph.D., P.E., P.G. Director, Groundwater Resources Texas Water Development Board Lost Pines GCD Meeting November 18, 2009

  2. Topics • Overview • Desired Future Condition Discussion • Groundwater Budget of GMA 12 • Model Run for GMA 12

  3. Groundwater Level Decline Since Pre-Development (ft)

  4. Groundwater Management in Texas • 1904 – Rule of Capture • 1949 – Groundwater Conservation Districts • Can alter, modify or discard Rule of Capture • Preferred method of groundwater management • 2001 – Groundwater Management Areas • Part of SB 2

  5. Groundwater Management Areas • SB 2 (2001) • Groundwater Conservation Districts (GCD) share management plans • Joint planning (if a GCD called for it) • TWDB designated 16 GMAs

  6. Groundwater Management Areas (GMA) 1 2 6 8 11 3 7 5 12 4 14 9 15 10 13 16

  7. Ogallala GMA 1 & 2

  8. Pecos Valley GMA 3

  9. Hueco & Mesilla Bolsons GMA 5

  10. Seymour GMA 6

  11. Edwards-Trinity Plateau GMA 7 (3,4,9)

  12. Trinity GMA 8, 9, 10

  13. Edwards GMA 10 & 8

  14. Carrizo-Wilcox GMA 11, 12, 13

  15. Gulf Coast GMA 14, 15, 16

  16. 19 Minor Aquifers

  17. Groundwater Management Areas • HB 1763 (2005) • Annual review of management plans and accomplishments • Requires joint planning

  18. Joint Planning • GCDs within the GMA vote • 1 vote per GCD • Desired Future Condition • Managed Available Groundwater

  19. 4 7 5 10 6 1 20 0 5 5 6 9 Groundwater Conservation Districts in Each GMA 13 8 9 9

  20. Before HB 1763 • Groundwater Availability • Groundwater Conservation Districts • Regional Water Planning Groups • Groundwater Availability Models • Tools to assist in developing estimates

  21. After HB 1763 • Groundwater Availability • Desired Future Condition (DFC) • Managed Available Groundwater (MAG)

  22. Desired Future Condition (DFC) • Quantified conditions of groundwater resources • Specified time or times in the future

  23. DFC is a Broad Policy Goal • Drawdown • Spring flow • Storage volumes

  24. DFC vs. Other “Yield” Concepts • Safe Yield • Sustainable Yield

  25. Safe Yield • The amount of water which can be withdrawn from a groundwater basin annually without producing an undesired result

  26. Sustainable Yield • The amount of groundwater pumping that can be maintained for an indefinite time without causing unacceptable environmental, economic, or social consequences. 

  27. Compare and Contrast • Safe Yield & Sustainable Yield • Define and Avoid Impacts • DFC • Achieve a Goal

  28. Managed Available Groundwater • “Calculated” based on DFC • Texas Water Development Board • Based on: • Models (including GAMs) • Water budget calculations • District provided data and information

  29. Groundwater Availability = DFC + MAG

  30. Groundwater Availability = Policy + Science Groundwater Availability = DFC + MAG

  31. “Current” Approach to Establish DFCs • Define aquifers (and sometimes subunits) • Define counties (and sometimes subareas) • Develop individual target DFCs • Define pumping estimates/constraints • Define “recharge condition” (average or drought of record) • Model run

  32. “Expected” Desired Future Conditions (DFC)

  33. “Current” Approach • “Single” model run • Run model • Check drawdown against “target” DFCs • Adjust pumping • Run Model • Check drawdown against “target” DFCs • Adjust pumping :

  34. Once Model Run is Completed • MAGs calculated based on model run • Amount of pumping that will achieve DFC • Split by DFC, GCD, RWPG, River Basin

  35. Use of Central Carrizo-Wilcox GAM • Historic Groundwater Budget • Regional Assessment with Model Runs

  36. Groundwater Budgets • Accounting of: • Inflows • Outflows • Storage Change

  37. Predevelopment Groundwater System

  38. Predevelopment Groundwater System Inflow

  39. Predevelopment Groundwater System Inflow Outflow

  40. Predevelopment Groundwater System Inflow Outflow Equilibrium: Inflow = Outflow

  41. Postdevelopment Pumping

  42. Postdevelopment Pumping Increased Inflow

  43. Postdevelopment Pumping Decreased Outflow Increased Inflow

  44. Postdevelopment Pumping Decreased Outflow Increased Inflow Decreased Storage

  45. 11 8 12 10 14 15 13

  46. 11 8 12 10 14 Inflow:PrecipitationGMA 13GMA 14 15 13

  47. Outflow:PumpingSurface WaterEvapotranspirationSpringsYounger AquifersGMA 8GMA 11GMA 15 11 8 12 10 14 15 13

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