Water for Texas - 2002 - Volumes I - III

Table of Contents

VOLUME I

1.0 Highlights and Major Policy Recommendations of the 2002 State Water Plan 6

2.0 Introduction 19

2.1 Organization of the Plan 21

3.0 History of Water Planning in Texas 21

4.0 Water Planning Process 24

4.1 Regional Water Planning Areas 24

4.2 Regional Water Planning Groups (Planning Groups) 25

4.3 Regional Water Planning 26

4.4 Coordination between Planning Groups, States, and Mexico 27

5.0 Methodology and Results 29

5.1 Population Projections 29

5.1.1 TWDB Projections and the 2000 Census 30

5.2 Water Demand Projections 33

5.2.1 Municipal Water Demand 33

5.2.1.1 Per Capita Water Use 33

5.2.1.2 Conservation 34

5.2.1.3 Projections 35

5.2.2 Manufacturing Water Demand 35

5.2.3 Irrigation Water Demand 36

5.2.4 Steam-Electric Power Water Demand 37

5.2.5 Mining Water Demand 37

5.2.6 Livestock Water Demand 38

5.2.7 Criteria for Revision of Water Demand Projections 38

5.3 Water Supply Projections 42

5.3.1 Groundwater 42

5.3.1.1 Aquifers of Texas 43

5.3.1.2 Groundwater Availability 43

5.3.1.3 Groundwater Supplies 44

5.3.2 Surface Water 44

5.3.2.1 River Basins 45

5.3.2.2 Reservoirs 45

5.3.2.3 Surface Water Availability and Supplies 45

5.3.3 Wastewater Reuse 46

5.3.4 Total Supplies for the Planning Areas 46

6.0 Environmental Planning 65

6.1 Environmental Flow Needs and Unique Stream Segments 66

6.2 New Environmental Assessment Tools 67

7.0 Identification of Needs 68

7.1 Water User Groups and Major Water Providers with Needs 69

7.2 Needs by River Basin 69

8.0 Recommended Water Management Strategies 75

8.1 Water Conservation 76

8.2 Groundwater 78

8.3 Surface Water 78

8.4 Reuse 79

8.5 Desalination 79

8.6 Brush Control 79

8.7 Major Conveyances 80

9.0 Implementation Cost Estimates 2001–2050 85

10.0 Alternative Strategies 88

10.1 Voluntary East Texas Surface Water Transfers 89

10.2 Playa Modification 89

10.3 Additional Desalination 90

11.0 Regional Summaries 92

12.0 Socioeconomic Impacts 124

12.1 Estimating Socioeconomic Impacts 124

12.2 Impacts of Not Meeting Water Needs 125

13.0 Status of Water Availability Modeling 127

13.1 Groundwater Availability Modeling 127

13.2 Surface Water Availability Modeling 130

14.0 Policy Recommendations 130

14.1 Policy Recommendations from the Planning Groups 131

14.2 Recommendations for Designation of Stream Segments of Unique

Ecological Value 140

14.3 Recommendations for Unique Reservoir Sites 143

Appendix I

Policy Recommendations from Stakeholders 147

List of Figures

3-1 History and projected future of reservoir development in Texas 24

4-1 Location of the 16 regional water planning areas in Texas 28

5-1 Projected population growth in Texas 31

5-2 Numerical difference between TWDB’s projection for 2000 and the

2000 Census 32

5-3 Percent difference between TWDB’s projection for 2000 and the 2000 Census. 32

5-4 Projected water demand for irrigation, municipal, and manufacturing water uses during drought 41

5-5 Projected water demand for steam-electric, livestock, and mining water uses during drought 41

5-6 Regional per capita water demand projections for 2000-2050 42

5-7 Analysis of total 1999 water use by county in Texas, illustrating dominant supply source 49

5-8 The major aquifers of Texas 50

5-9 The minor aquifers of Texas 51

5-10 Location of the Yegua-Jackson aquifer in Texas 52

5-11 Groundwater availability for aquifers of Texas under drought conditions, as reported by Planning Groups

VOLUME II

1. Water User Group Summaries

1.1. Water User Group Name

1.2. Water User Group Region

1.3. Water User Group County

1.4. Water User Group Basin

1.5. Projected Population

1.6. Projected Water Demand

1.7. Sources and Supply Amounts

1.8. Needs Analysis

1.9. Recommended Water Management Strategies

1.10. Overall Water Balance including Strategies

2. Major Water Provider Summaries

2.1. Major Water Provider Name

2.2. Major Water Provider Region

2.3. Contracts and Demands

2.4. Sources and Supply Amounts

2.5. Needs Analysis

2.6. Recommended Water Management Strategies

VOLUME III

1. Electronic Version of Volume I

2. The 16 Approved Regional Water Plans

3. Stakeholders Report