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Methodology –

Methodology –. Allocation of Ogallala Groundwater Supplies. Supply to Ogallala WUGs - 2011 Plan. Used GAM to assist with irrigation and municipal users Irrigation Users Lesser of GAM or demands Municipal Users Consider well capacity Other Users Met demands

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Methodology –

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  1. Methodology – Allocation of Ogallala Groundwater Supplies

  2. Supply to Ogallala WUGs - 2011 Plan • Used GAM to assist with irrigation and municipal users • Irrigation Users • Lesser of GAM or demands • Municipal Users • Consider well capacity • Other Users • Met demands • Greater flexibility in moving to areas with water than irrigated agriculture

  3. Irrigation Zones

  4. Irrigation Supplies-Current Methodology • Captures intent of DFC • Limits geographical extent of supply allocation • Allows additional supply to be developed by others • Protects other landowner rights • Simply a plan • No legal implications

  5. Irrigation Supplies-Current Methodology • Conservative Approach • 1 mi2 grid – competition for water • Limits supply in time and space • 54 one-year simulations • Water will flow to irrigation wells from outside grid area

  6. Recommendation • Use Updated GAM (2010) for irrigation and municipal users • Add a 1 sq mile (1 grid cell) buffer • Include unassigned interior grid cells within irrigated areas as available for irrigation • Continue same approach for other users

  7. Surface Water Lake Meredith and Greenbelt Reservoir

  8. Greenbelt Reservoir

  9. Greenbelt Reservoir

  10. Reservoir Yield Firm Yield = 5,487 ac-ft/yr

  11. Reservoir Yield Safe Yield = 4,530 ac-ft/yr

  12. Future Reservoir Storage

  13. Reservoir Yield • Based on historical hydrology: • Spring flows contribute 4,500 – 5,000 ac-ft/yr • Greenbelt can meet current demands during drought (3,850 ac-ft/yr) • If spring flow reduced or ceases: • 1 to 2 years’ supply remaining • Recommend using reliable supply of 3,850 ac-ft/yr

  14. Lake Meredith

  15. Reservoir Yield Firm Yield = 55,000 ac-ft/yr Safe Yield = 50,000 ac-ft/yr

  16. Future Reservoir Storagewith Firm Yield Diversions Full Hydrologic Period – 1940 - 2012

  17. Future Reservoir Storagewith No Diversions Full Hydrologic Period – 1940 - 2012

  18. Future Reservoir Storagewith No Diversions Historic Hydrologic Period – 1965 - 2012

  19. Reservoir Yield • Historical hydrology and WAM hydrology with future Ute use • Firm yield shows minimum content at end of simulation • Future supplies are less than firm yield • Even with no diversions, continued minimum inflows will continue to deplete storage • Working with CRMWA on future supply for planning

  20. Methodology –Water Management Strategies PWPG Meeting August 6, 2012

  21. Feasible Strategies From TAC 357.5 “Before a regional water planning group begins the process of identifying potentially feasible water management strategies, it shall document the process by which it will list all possible water management strategies and identify the water management strategies that are potentially feasible for meeting a need in the region.”

  22. Identification Process • Identify entities with needs • Review recommended strategies in 2011 plan • Determine if new or changed strategies are needed • Contact entity for input • Contact PWPG representative for county-wide WUGs • Verify recommendations

  23. Feasible Strategies • Considerations • A strategy must use proven technology • A strategy should be appropriate for regional planning • A strategy should have an identifiable sponsor • Must consider end use. Includes water quality, economics, geographic constraints, etc. • Must meet existing regulations

  24. Feasible Conservation Strategies • Water conservation • Review for applicability and develop appropriate strategies for all municipal and irrigation WUGs • Applicable municipal WUGs > 140 gpcd • Identify appropriate conservation strategies for other types of water use; apply to WUGs with a need • Drought management • Emergency measures • Generally, not recommended for long-term

  25. Feasible Strategies • Expanded use of existing supplies or new supplies • New groundwater wells • Consider groundwater availability • Conjunctive use of groundwater & surface water • New infrastructure • Voluntary Transfer • Contracts • Sales, leases and options

  26. Feasible Strategies • Desalination of brackish water • Wastewater reuse • Identify generators of wastewater and potential recipients for reuse • Identify opportunity for expansion • Yield enhancement • Brush management • Precipitation enhancement • Recharge enhancement

  27. Evaluations • Quantity, cost and reliability • Environmental factors • Impacts on water resources and other WMS • Impacts on agriculture/ rural • Impacts on natural resources • Impacts on key water quality parameters • Other relevant considerations

  28. Alternative Strategies • Selected with entity input • Evaluated using same considerations for selected strategies • Included in 2016 Plan

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