WATER SUPPLY STUDY FOR ELLIS COUNTY, JOHNSON COUNTY, THE SEAL THAT ORIGINALLY APPEARED SOUTHERN ON THIS DOCUMENT WAS AUTHORIZED BY STEPHANIE W. GRIFFIN, P.E., TEXAS NO. DALLAS COUNTY, 88504 ON APRIL 23, 2009. ALTERATION OF A SEALED DOCUMENT WITHOUT PROPER AND SOUTHERN NOTIFICATION OF THE RESPONSIBLE ENGINEER IS AN OFFENSE UNDER THE TARRANT COUNTY TEXAS ENGINEERING PRACTICE ACT. __________________________________ APRIL 2009 Stephanie W. Griffin, P.E. Prepared for: Region C Water Planning Group and the Tarrant Regional Water THE SEAL THAT ORIGINALLY APPEARED District in Cooperation ON THIS DOCUMENT WAS AUTHORIZED BY THOMAS C. GOOCH, P.E., TEXAS NO. 50668 with the Brazos G Water ON APRIL 23, 2009. ALTERATION OF A Planning Group SEALED DOCUMENT WITHOUT PROPER NOTIFICATION OF THE RESPONSIBLE ENGINEER IS AN OFFENSE UNDER THE TEXAS ENGINEERING PRACTICE ACT. __________________________________ Thomas C. Gooch, P.E. Prepared by: Freese and Nichols, Inc. Alan Plummer Associates, Inc. CP&Y, Inc. HDR, Inc. NTD07286 Water Supply Study for Ellis County, Johnson County, APRIL 2009 Southern Dallas County, and Southern Tarrant County REGION C WATER PLANNING GROUP Water Supply Study for Ellis County, Johnson County, Southern Dallas County, and Southern Tarrant County TABLE OF CONTENTS Page ES. Executive Summary................................................................................................. ES-1 1. Introduction................................................................................................................. 1-1 1.1 Background .............................................................................................................. 1-1 1.2 Need for Study and Project Objectives.................................................................. 1-3 2. Description of the Study Area and Previous Water Supply Plans ......................... 2-1 2.1 Description of the Study Area................................................................................. 2-1 Ellis County ............................................................................................................ 2-1 Johnson County....................................................................................................... 2-7 Southern Dallas County and Southern Tarrant County Entities in the Study Area2-11 2.2 Previous Regional Water Supply Plans ............................................................... 2-11 Region C Plan (Ellis, Southern Dallas, and Southern Tarrant Counties) ............. 2-12 Brazos G Plan – Johnson County.......................................................................... 2-13 2.3 Local Studies .......................................................................................................... 2-14 BRA and TRWD: Regional Water Supply and Wastewater Services Study for Johnson and Parker Counties, Phase I (9)............................................................. 2-14 City of Midlothian: Long Range Water Supply and Water and Wastewater Master Plan (10).................................................................................................................. 2-15 Johnson County SUD: Evaluation of Additional Water Supplies from the Trinity and Brazos River Basins (11).................................................................................. 2-16 Sardis-Lone Elm WSC: System Hydraulics (12) .................................................... 2-17 City of Arlington: Feasibility Study of Becoming a Wholesale Water Provider 2-17 3. Input from Study Area Water Suppliers.................................................................. 3-1 3.1 Input Provided by Water User Groups and Wholesale Water Providers.......... 3-1 Initial Meetings and Survey of Water User Groups and Wholesale Water Providers ................................................................................................................. 3-1 Meetings with Major Wholesale Water Providers in the Study Area..................... 3-3 Additional Contact with Water User Groups and Wholesale Water Providers...... 3-4 3.2 Contracting and Operational Issues for Tarrant Regional Water District........ 3-5 i Water Supply Study for Ellis County, Johnson County, APRIL 2009 Southern Dallas County, and Southern Tarrant County 3.3 Assumptions for Planning ....................................................................................... 3-8 4. Revised Population and Demand Projections .......................................................... 4-1 4.1 Population Projections............................................................................................. 4-1 4.2 Demand Projections................................................................................................. 4-4 4.3 Demand for Wholesale Water Providers............................................................... 4-9 4.4 Comparison of Contracted Supply to Projected Demands................................ 4-14 5. Recommended Water Management Strategies........................................................ 5-1 5.1 Ellis County .............................................................................................................. 5-1 Waxahachie-Rockett SUD Project.......................................................................... 5-1 Wholesale Water Providers..................................................................................... 5-4 Backup Supplies for the Sokoll Plant ................................................................... 5-12 Other Ellis County Water Management Strategies............................................... 5-13 5.2 Johnson County...................................................................................................... 5-13 Wholesale Water Providers................................................................................... 5-16 Other Johnson County Water Management Strategies ......................................... 5-19 5.3 Portions of Southern Dallas and Southern Tarrant Counties in Study Area .. 5-26 6. Implementation Plan for Recommended Strategies ................................................ 6-1 7. Alternative Water Management Strategies.............................................................. 7-1 8. Recommendations....................................................................................................... 8-1 APPENDICES Appendix A References Appendix B Sample Survey Appendix C Population and Demand Projections Memorandum Appendix D Population Figures Appendix E Water Demand Figures Appendix F Comparison of Demand and Supply by Water User Group Appendix G Detailed Cost Estimates for Recommended Water Management Strategies Appendix H Detailed Cost Estimates for Alternative Water Management Strategies Appendix I Meetings with Large Regional Providers and Meeting with Study Area Participants Appendix J Region C Water Planning Group Responses to TWDB Comments on Draft Report ii Water Supply Study for Ellis County, Johnson County, APRIL 2009 Southern Dallas County, and Southern Tarrant County LIST OF TABLES Page ES.1 Summary of Population and Demand Projections for Study Area .............................ES-3 ES.2 Current and Future Supplies for Study Area Water User Groups ..............................ES-7 1.1 Members of the Region C Water Planning Group........................................................ 1-3 1.2 Members of the Brazos G Water Planning Group........................................................ 1-4 2.1 Estimated 2007 Populations for Ellis County Cities .................................................... 2-2 2.2 Estimated 2007 Populations for Johnson County Cities............................................... 2-3 2.3 Estimated 2007 Populations for Southern Dallas and Southern Tarrant County Cities2-3 2.4 Current Water Supply Sources for Ellis County........................................................... 2-4 2.5 Current Water Supply Sources for Johnson County..................................................... 2-8 2.6 Current Water Supply Sources for Study Area Water Suppliers in Tarrant and Dallas Counties ........................................................................................................... 2-11 3.1 Water Suppliers Contacted through Meetings or Surveys............................................ 3-2 3.2 Meetings with Water User Groups and Wholesale Water Providers............................ 3-2 3.3 Trinity River Authority Managed Contracts for Tarrant Regional Water District Supply in the Study Area .............................................................................................. 3-6 4.1 Summary of Population and Demand Projections........................................................ 4-7 4.2 Study Area Demand Projections for Current and Proposed Customers of Wholesale Water Providers (Acre-Feet per Year).......................................................................... 4-9 4.3 Current and Proposed Customers of the Local Wholesale Water Providers .............. 4-12 5.1 Summary of Recommended Water Management Strategies for Ellis County ............. 5-2 5.2 Projected Demand and Supply for Ennis...................................................................... 5-6 5.3 Water Management Strategies for Ennis ...................................................................... 5-6 5.4 Projected Demand and Supply for Midlothian ............................................................. 5-7 5.5 Water Management Strategies for Midlothian.............................................................