Lake 7 Update
HDR Engineering, Inc.
TWCA Annual Convention
March 3-5, 2010
2007 Strategic Water Supply Plan
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Existing Long-Term Supplies
Bailey County
Lake Meredith
Roberts County
6,000 acft/yr
Well Field
23,000 acft/yr
Well Field
4,000 acft/yr
Total Supplies
35,000 acft/yr
Park/School
Wells
2,000 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
Lake Meredith
Bailey County
Well Field
Water
Conservation
Roberts County
Well Field
Park/School
Wells
Lake 7
Developed
Storm Water
Water Reuse
North Fork
Diversion
Lake Alan
Henry
Post
Reservoir
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