Water Planning for Texas and the South Central Region

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Water Planning for Texasand the South Central
Region

• Because Every Drop Ripples Through the Region...

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Purpose and Intention of the Water Planning
Process

• Water planning for ALL needs
• Drought preparation
• Provides for orderly development, management, and
  conservation of water resources of the state.

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Introduction

• Regional Water Planning Process for the State
  Established by Senate Bill 1 in 1997.
• 16 RWPGs Prepared Plans that address Fifty Year
  Water Needs.
• TWDB used 16 Regional Plans to Develop the 2002
  State Water Plan.
• Five Year Update Represented by Initially
  Prepared 2006 Regional Plan

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South Central Texas Planning Region (Region L)
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River Basins of the South-Central Texas Region
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Aquifers River Basins of theSouth-Central
Texas Region
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Regional Planning Process
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Year 2060 Projected Shortages by User Category
Shown as a percent of total shortage
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Water Demands Vs SuppliesCounties with Projected
Municipal Shortages by 2060
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Water Demands Vs SuppliesCounties with Projected
Irrigation shortages by 2060
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2006 South Central Texas Regional Water Plan
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Sources of New Supply in 2060
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Groundwater Sources Represent 25 of New Supply

• Local Carrizo, Gulf Coast, Trinity
• Regional Carrizo for Bexar County Supply and
  SSLGC Project Expansion
• Hays/Caldwell Carrizo Project
• Simsboro Aquifer
• Brackish Groundwater Desalination of Wilcox and
  Gulf Coast Aquifer

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Conjunctive Use Sources Represent 33 of New
Supply

• Edwards Recharge Type 2 Projects
• Lower Guadalupe Water Supply Project
• LCRA-SAWS Water Project

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Available Resources, Rights, and Reservoirs
Represent 18 of New Supply

• Edwards Transfers
• Recycled Water
• Canyon Reservoir
• Surface Water Rights
• Increased LGWSP Capacity for GBRA Needs

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Additional New Supplies

• Conservation Represents 14 of New Supply
• Seawater Desalination Represents 10 of New
  Supply
• Strategies Needing Further Study and/or Funding
• Brush Management
• Weather Modification
• Rainwater Harvesting
• Small Aquifer Recharge Dams
• Inter-Regional Cooperation
• Additional Storage
• Recharge and Recirculation

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New Supplies Cost Estimates

• Average Project Cost is 860/acft/year
• 2.65 / 1000 gallons
• Municipal Supply Projects Cost Range from
• 135/acft/yr (0.41/1000 gals) for Edwards
  Irrigation Transfers
• 1,390/acft/yr (4.27 /1000 gals) for Seawater
  Desalination

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SCTRWPG Initially Prepared 2006 Regional Water
Plan

• Final Comment Due September 20, 2005
• Regional Water Planning Group Meets
• August 4
• September 8
• October 6
• November 3
• Regional Water plans to TWDB on January 5, 2006

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Revision Process for Initially Prepared 2006
Regional Water Plan

• Pubic Comments
• State Agency Comments
• Refinements of Local Water Plans
• SAWS
• Canyon Regional
• Groundwater Planning

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2007 State Water Plan

• Jan Dec 2006 TWDB Develops State Water Plan
• November 2006 TWDB Public Hearings on State Water
  Plan
• January 2007 State Water Plan Adopted by the TWDB
  and delivered to Legislature