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Reservoir Development Update

Reservoir Development Update. Region K Meeting July 11, 2012 Karen Bondy, P.E. Manager of Resource Strategy. New Water Supply Goal. 100,000 ac-ft/yr by 2017 Reduce interruptible demands on Highland Lakes Improve agricultural water reliability Improve agricultural water efficiency

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Reservoir Development Update

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  1. ReservoirDevelopment Update Region K Meeting July 11, 2012 Karen Bondy, P.E. Manager of Resource Strategy

  2. New Water Supply Goal • 100,000 ac-ft/yr by 2017 • Reduce interruptible demands on Highland Lakes • Improve agricultural water reliability • Improve agricultural water efficiency • Reduce risk of firm water curtailment

  3. Development Strategy • 3 Critical Drivers • 100,000 ac-ft/yr • In 5 years • No rate increase • Effect on Development Strategy • Maximize use of existing assets • Minimize construction of new facilities • Minimize environmental and water rights permitting

  4. LCRA’s Current Water Sources Total Conservation Capacity- 2.1 Mafy Maximum Interruptible Water Supply- 1.5 Mafy

  5. Existing LCRA Assets • Lower basin senior water rights • Irrigation division pump stations* and canals • Baylor Creek land and storage rights • Excess flows water right (5731) • Pierce Ranch land option • Lake Bastrop land and groundwater * May require substantial repairs/upgrades

  6. Lower Basin Map Austin Lake Bastrop Fayette Power Project — 38,101 AFY Colorado River Environmental Flow Commitment (2010 WMP) 33,440 AFY Lakeside Garwood Pierce Ranch Underground Services Markham 12,327 AFY Gulf Coast River Pump Station Firm Customer(AFY = Acre-feet per year) Oxea 3,222 AFY STP 40,000 AFY

  7. Water Availability Results • 100,000 ac-ft/yr available in lower basin • Requires diverting and storing to “firm up” • Adequate pumping capacity at Lakeside, Garwood and Gulf Coast • ~70,000 ac-ft of storage required • New reservoirs can meet 100,000 ac-ft/yr goal

  8. Two Potential Configurations • Reservoirs in irrigation divisions only • 2 to 4 reservoirs • Utilize existing pumps and canals • Requires construction of reservoirs and outlet facilities • Baylor Creek plus irrigation divisions • Requires reservoirs and new pump station, pumps and piping for Baylor Creek reservoir • Also requires water supply (water rights) for Baylor Creek diversion

  9. STP Pump Station

  10. Water Rights Summary **Need to amend downstream water right to add point of diversion at Baylor Creek Permit Amendment Needed Permit Terms Already in Place

  11. Next Steps • Optimize irrigation division reservoir size/location • Develop construction requirements, capital and operating cost estimates for all options • Determine if groundwater is cheaper alternative • Develop water rights and environmental permitting strategies • Prepare project recommendation for Board by end of year

  12. Recap • Only source of water for new reservoirs is LCRA’s lower basin water rights • Will require permit amendments • Reservoirs can meet 100,000 ac-ft/yr goal • Groundwater might be cheaper alternative • Construction requirements: • All options need reservoir and outlet facilities • Baylor Creek also needs water supply, pump station and piping to plant (~ 4 miles)

  13. Questions & Discussion

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