Technical Reports Document Library

Note:  This report is included for its historical value but has been replaced by the Texas Water Plan.

The objectives of this West Central Trans-Texas Study are to present summarized information from the previous Trans-Texas reports as follows:

• A summary of projected water demands and comparisons with existing water supplies for the West Central Study Area;

• Project data and information sheets describing each water supply alternative studied in the Trans-Texas program;

• A comparison of water supply alternatives studied in the Trans-Texas program; and

• Identification and discussion of other possible water supply alternatives.

The population and water demand projections are based upon the following conditions, assumptions, and data:

A. The TWDB 1996 consensus water planning projections, as follows:

1. Most likely population;

2. Most likely municipal water demand for below normal precipitation and advanced conservation;

3. Bas oil prices, with conservation for manufacturing;

4. Series 3 irrigation (aggressive adoption of irrigation technology and a reduction in Federal Farm Programs by one-half);

5. Steam-Electric power high series;

6. Mining – TWDB only series;

7. Livestock- TWDB only series

B. The quantity of water supply from the Edwards Aquifer is based upon provisions of SB 1477, with pumpage set at 450,000 acft/yr for the period 1997 through 2007, and 400,000 acft/yr beginning in 2008, and the assumption that each entity which obtained water from the Edwards Aquifer in 1990 will have its 1990 pro rata share of Edwards pumpage in future years.

C. Texas Water Development Board (TWDB) groundwater information for counties of the study area.

D. The quantity of surface water supply from reservoirs of the study area is the firm yield of each respective reservoir, as determined by previous studies, and in accordance with water rights permits issued by the Texas Natural Resource Conservation Commission (TNRCC).

E. The quantity of dependable surface water supplies from run-of-river water rights permits was calculated for study area counties of the Nueces and Guadalupe-San Antonio River Basins using the existing Nueces and Guadalupe-San Antonio River Basin models developed by HDR Engineering, Inc. These computations were based upon Edwards Aquifer pumpage of 400,000 acft/yr. Dependable supplies of surface water from run-of-river permits for counties of the Lower Colorado River Basin were tabulated from computer model results that were prepared by the Lower Colorado River Authority for use in the North Central Trans-Texas (NCTT) study.