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FLOWS FOR THE FUTURE 2005 Environmental Flows Conference Texas State University – San Marcos

FLOWS FOR THE FUTURE 2005 Environmental Flows Conference Texas State University – San Marcos November 1, 2005 Bob Brandes Region M Water Planning Study. Rio Grande Planning Region. Region M Counties and River Basins. Region M Projected Population. Region M Environmental Flow Issues.

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FLOWS FOR THE FUTURE 2005 Environmental Flows Conference Texas State University – San Marcos

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  1. FLOWS FOR THE FUTURE 2005 Environmental Flows Conference Texas State University – San Marcos November 1, 2005 Bob Brandes Region M Water Planning Study

  2. Rio Grande Planning Region

  3. Region M Counties and River Basins

  4. Region M Projected Population

  5. Region MEnvironmental Flow Issues • Rio Grande Flows Are Highly Regulated andSubject to Mexico’s Operations • Rio Grande Basin Is Already Over-Appropriated • Projected Demands Are Changing and Substantial Relative To Existing Supplies • Strategies Reflect Primarily Utilization of Existing Surface Water Resources; No Major Surface Water Development

  6. MajorRio GrandeMainstemReservoirs Caballo Reservoir Amistad Reservoir Elephant Butte Reservoir Falcon Reservoir Anzalduas Reservoir Total Storage Capacity: ~ 8,000,000 Acre-Feet

  7. 1968-1998 Rio Grande Mean Annual Flows

  8. Total Storage Capacity: ~ 4,000,000 Acre-Feet MexicanTreatyTributaryReservoirs Rio San Juan Reservoir Capacity: ~ 1,700,000 Acre-feet

  9. Region MEnvironmental Flow Issues • Rio Grande Flows Are Highly Regulated andSubject to Mexico’s Operations • Rio Grande Basin Is Already Over-Appropriated • Projected Demands Are Changing and Substantial Relative To Existing Supplies • Strategies Reflect Primarily Utilization of Existing Surface Water Resources; No Major Surface Water Development

  10. Region M Existing Water Rights Total Authorized Water Rights: 2,247,334 Ac-Ft/Yr

  11. Projected Firm Annual YieldAmistad-Falcon Reservoir System

  12. Region MEnvironmental Flow Issues • Rio Grande Basin Is Already Over-Appropriated • Rio Grande Flows Are Highly Regulated and Subject to Mexico’s Operations • Projected Demands Are Changing and Substantial Relative To Existing Supplies • Strategies Reflect Primarily Utilization of Existing Surface Water Resources; No Major Surface Water Development

  13. Region M Water Demands

  14. Municipal Supply vs Demand (acre-feet/year)

  15. Irrigation Supply vs Demand (acre-feet/year)

  16. Historical Irrigation Demands Total Irrigation Water Use Varies According To Available Amistad-Falcon Supply and Climate

  17. Region MEnvironmental Flow Issues • Rio Grande Basin Is Already Over-Appropriated • Rio Grande Flows Are Highly Regulated andSubject to Mexico’s Operations • Projected Demands Are Changing and Substantial Relative To Existing Supplies • Strategies Reflect Primarily Utilization of Existing Surface Water Resources; No Major Surface Water Development

  18. Projected Water SuppliesFrom Recommended Strategies

  19. Strategies With PotentialDirect River Flow Impacts • Acquisition/Conversion of Existing Water Rights • Urbanization of Irrigated Farmland • Purchase of Existing Unused Water Rights • Contract for Municipal Water from Irrigation District • Brownsville Weir and Reservoir • Water Right Permit Issued By State • Includes Environmental Flow Provisions

  20. FLOWS FOR THE FUTURE 2005 Environmental Flows Conference Texas State University – San Marcos November 1, 2005 Bob Brandes Region M Water Planning Study

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