Table of Contents

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Table of Contents by Section: Text, Figures and Tables Links

Original Table of Contents

Overview | Counties | Aquifers | Rivers | Entities | About the Plan | Keywords | Files | For Users

Section Page

1 Description of South Central Texas Region (with Section 1.1 to 1.6) Text linked to Figures and Tables..................................................................................................... 1-1

1.1 Background............................................................................................ 1-1

1.2 Physical Description of the South Central Texas Region.................. 1-2

1.2.1....... Climate................................................................................... 1-2

1.2.2....... General Geology................................................................... 1-5

1.2.3....... Vegetational Areas............................................................... 1-5

1.2.4....... Natural Resources................................................................. 1-9

1.2.5....... Major Water Demand Centers.......................................... 1-11

1.3 Population and Demography.............................................................. 1-13

1.3.1....... Historical and Recent Trends in Population..................... 1-13

1.3.2....... Demographic Characteristics........................................... 1-15

1.4 Economy – Major Sectors and Industries......................................... 1-18

1.4.1....... Summary of the South Central Texas Regional
Economy.............................................................................. 1-18

1.4.2....... Agricultural Production....................................................... 1-18

1.4.3....... Livestock Production.......................................................... 1-20

1.4.4....... Mining................................................................................... 1-22

1.4.5....... Manufacturing...................................................................... 1-22

1.4.6....... Trades and Services.......................................................... 1-24

1.5 Water Uses........................................................................................... 1-24

1.6 Major Municipal and Manufacturing Water Providers...................... 1-27

1.6.1....... San Antonio Water System................................................ 1-27

1.6.2....... Bexar Metropolitan Water District..................................... 1-28

1.6.3....... Canyon Regional Water Authority..................................... 1-28

1.6.4....... Guadalupe-Blanco River Authority.................................... 1-28

1.6.5....... New Braunfels Utilities........................................................ 1-29

1.6.6....... City of San Marcos............................................................. 1-29

1.7 Water Supplies (with Section 1.8)..................................................... 1-29

1.7.1....... Groundwater........................................................................ 1-29

1.7.2....... Surface Water..................................................................... 1-38

1.7.3....... Existing Surface Water Resources, Including
Major Springs...................................................................... 1-41

1.8 Water Quality........................................................................................ 1-47

1.8.1....... Groundwater Quality........................................................... 1-47

1.8.2....... Surface Water Quality......................................................... 1-50

1.9 Threats to Agricultural and Natural Resources (with Section 1.10.3) 1-51

1.10 Summary of Existing Plans and Programs....................................... 1-52

1.10.1..... State and Federal Plans/Programs.................................. 1-53

1.10.2..... Regional Water Plans......................................................... 1-63

1.10.3..... Certified Groundwater Conservation District
Management Plans............................................................. 1-69

1.10.4..... Local Water Plans............................................................... 1-74

1.10.5..... Water Conservation and Drought Contingency Plans
(with Section 1.12).............................................................. 1-90

1.10.6..... Water Quality Programs................................................... 1-102

1.10.7..... Summary of Other Information Available from
Existing Local/Regional Planning................................... 1-104

1.11 Water Availability Requirements Promulgated by a County
Commissioners Court....................................................................... 1-105

1.12 Current Preparations for Drought.................................................... 1-105

List of Figures

Figure Page

1-1 Eco-Regions — South Central Texas Region................................................ 1-6

1-2 Percentages of Population Residing in Urban and Rural
Areas (1990).................................................................................................... 1-15

1-3 Age Distribution of the Population (1990)..................................................... 1-17

1-4 Level of Educational Achievement (1990).................................................... 1-17

1-5 Major Aquifers.................................................................................................. 1-30

1-6 River Basins, Coastal Basins, Reservoirs, and Lakes................................ 1-39

List of Tables

Table Page

1-1 South Central Texas Region – List of Counties (Location by
River Basin and Edwards Aquifer Area)......................................................... 1-3

1-2 Climatological Data for South Central Texas Region.................................... 1-4

1-3 Agricultural Resources — 1997..................................................................... 1-12

1-4 Population Growth – 1950 to 1998................................................................ 1-14

1-5 Major Cities in the South Central Texas Region.......................................... 1-15

1-6 County Population and Area........................................................................... 1-16

1-7 Summary of Farm Production Data - 1997................................................... 1-19

1-8 Summary of Livestock Production Data - 1997........................................... 1-21

1-9 Summary of Manufacturing Activity - 1992.................................................... 1-23

1-10 Trades and Services Industry - 1992............................................................. 1-25

1-11 Groundwater Availability by Aquifer............................................................... 1-38

1-12 List of Major Reservoirs.................................................................................. 1-43

1-13 Summary of Run-of-River Water Rights........................................................ 1-45

1-14 Summary of Plans/Studies Submitted to the SCTRWPG 1 2 3 4 5 1-54