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Lake 7 Update

Lake 7 Update. HDR Engineering, Inc. TWCA Annual Convention March 3-5, 2010. 2007 Strategic Water Supply Plan. Existing Long-Term Supplies. Lake Meredith 6,000 acft /yr. Roberts County Well Field 23,000 acft /yr. Bailey County Well Field 4,000 acft /yr. Park/School Wells

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Lake 7 Update

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  1. Lake 7 Update • HDR Engineering, Inc. TWCA Annual Convention March 3-5, 2010

  2. 2007 Strategic Water Supply Plan

  3. Existing Long-Term Supplies Lake Meredith 6,000 acft/yr Roberts County Well Field 23,000 acft/yr Bailey CountyWell Field 4,000 acft/yr Park/School Wells 2,000 acft/yr Total Supplies35,000 acft/yr

  4. Current Supply Limitations • Lake Meredith • Firm yield reduced from >103,000 acft/yr to <60,000 acft/yr • Lubbock allocation reduced from 26,000 acft/yrto 6,000 acft/yr • Roberts County Well Field • Lubbock allocation increased to 26,000 acft/yr in 2009. • Bailey County Well Field • Target: 10,000 acft/yr (30-40 years) • Recharge rate: 3,000 to 4,000 acft/yr • Short-term demand: > 10,000 acft/yr

  5. Region O Water Plan(Initially Prepared 2011 Plan) • Lubbock Water Needs (year 2060) Demand = 56,516 acft/yr Supply = 34,876 acft/yr Shortage = 21,640 acft/yr • Lubbock Plan Components • Municipal Water Conservation (7,662 acft/yr) • Lake Alan Henry Pipeline (21,880 acft/yr) • Lake 7 (17,650 acft/yr – stand-alone) • Post Reservoir (25,720 acft/yr – stand-alone) • North Fork Diversion Operation (26,169 acft/yr – stand-alone) • Brackish Groundwater Desalination (3,360 acft/yr)

  6. Jim Bertram System Lake 7

  7. Lake 7 Overview • Capacity: 20,700 acft • Area: 1,100 acres • Supply Sources: • Unappropriated State water • Developed playa lake storm water • Developed City return flows • Supply: 17,650 acft/yr firm yield – varies with return flows • Cost: $10.1 million (reservoir only – 2011 Region O Plan) • Status • Included in 2006/2011 Region O Plan • TCEQ Water Right Application No. 5921 pending • Feasibility analysis under way

  8. Lake 7 Dam Site

  9. Lake 7 Conceptual Plan

  10. Lake 7 Conceptual Plan

  11. Lake 7 Status • TCEQ Application No. 5921 • Filed October 17, 2005 • Administratively Complete in April 2006 • Seeks appropriation of: • Unappropriated State water (little available) • Developed storm water from playa lake system • Future return flows • TCEQ Technical RFI regarding environmental issues

  12. Lake 7 Status • Environmental assessment • Data collected during summer/fall of 2009 • Analysis of data continues • Updated Environmental Information Document – Spring 2010 • Geotechnical evaluation • Core drilling completed September 2009 • Draft report under preparation • No “fatal flaws” • Feasibility report – Spring 2010 • Environmental and geotechnical evaluations • Flood hydrology for spillway sizing and costing • Optimize size of project

  13. Lake 7 Status

  14. Interfaces of the Various Projects Lake Meredith Roberts County Well Field Bailey CountyWell Field Water Conservation Park/School Wells Lake 7 Developed Storm Water North Fork Diversion Lake Alan Henry Water Reuse Post Reservoir

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