lake 7 update hdr engineering, inc. twca annual convention march 3-5, 2010
TRANSCRIPT
Lake 7 Update
HDR Engineering, Inc.
TWCA Annual Convention
March 3-5, 2010
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2007 Strategic Water Supply Plan
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Existing Long-Term Supplies
Bailey CountyWell Field
4,000 acft/yr
Lake Meredith
6,000 acft/yr
Roberts CountyWell Field
23,000 acft/yr
Park/SchoolWells
2,000 acft/yrTotal Supplies35,000 acft/yr
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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/yr
to 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
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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)
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Jim Bertram System Lake 7
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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
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Lake 7 Dam Site
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Lake 7 Conceptual Plan
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Lake 7 Conceptual Plan
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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
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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
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Lake 7 Status
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Interfaces of the Various Projects
Bailey CountyWell Field
Lake Meredith Roberts CountyWell Field
Park/SchoolWells
Water Conservation
Water Reuse
Lake Alan Henry
Lake 7
Post Reservoir
North Fork Diversion
Developed Storm Water