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

2. 2007 Strategic Water Supply Plan 3

3. Existing Long-Term Supplies Bailey County Well Field 4,000 acft/yr Lake Meredith 6,000 acft/yr Roberts County Well Field 23,000 acft/yr Park/School Wells 2,000 acft/yr Total Supplies 35,000 acft/yr 4

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/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 5

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

6. Jim Bertram System Lake 7 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

8. Lake 7 Dam Site 9

9. Lake 7 Conceptual Plan 10

10. Lake 7 Conceptual Plan 11

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

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

13. Lake 7 Status 14

14. Interfaces of the Various Projects Bailey County Well Field Lake Meredith Roberts County Well Field Park/School Wells Water Conservation Water Reuse Lake Alan Henry Lake 7 Post Reservoir North Fork Diversion Developed Storm Water 15