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Groundwater Management in GMA 12: Joint Planning Insights

Explore groundwater management in Texas GMA 12, including DFC, MAG, safe yield vs. sustainable yield, and joint planning mechanisms.

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Groundwater Management in GMA 12: Joint Planning Insights

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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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