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

Explore strategies and challenges to sustainably manage water resources in the Rio Grande Basin. Learn about existing surface water utilization and future demands. Discover potential solutions and impacts on river flows.

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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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