Trinity River project, Texas: Project memorandum no. 4, General design memorandum. Volume I-VI

A selected plan for partially resolving water and related land resource problems in the Trinty River basin between Trinity Bay and Fort Worth is presented in the accompanying Phase I General Design Memorandum and this Environmental Statement. The plan consists of a multiple-purpose project including three physical features: a multiple purpose channel from the Houston Ship Channel to the Port of Liberty, with extension for flood control to River Mile 45; Tennessee Colony Lake for mid and lower basin flood damage reduction, water supply, hydropower, and recreation-fish and wildlife; and the Dallas Floodway Extension for flood damage reduction in the city of Dallas. The selected plan also provides for acquisition of land for recreation and open space and to partially compensate for wildlife losses caused by construction and recommendation of a designated floodway along the West Fork of the Trinity River between Dallas and Fort Worth. The selected plan would have $16,435,000 average annual equivalent benefits from flood damages prevented, provide 150 cubic feet per second (cfs) dependable yield water supply initially and 382 cfs after the year 2010, preserve some important environmental areas in the basin, provide 7,727,000 recreation days of use with optimum development, provide 10,000 kilowatt capacity initially and 30,00 kilowatt capacity ultimately of electric power, and improve existing navigation to Liberty. About 198,978 acres of land would be removed from private and other public uses and dedicated to project purposes of flood control, water supply, recreation, navigation, and natural and cultural resource conservation or preservation. The plan would cause some unavoidable adverse short-term impacts on water quality and short-term and long-term impacts on fisheries, wildlife, and wildlife habitat, archeological sites, and other natural and cultural resources in construction areas. Acquisition of 11,693 acres of land adjacent to the multiple-purpose channel to Liberty is proposed to compensate for unavoidable loss of fish and wildlife resources due to the selected plan.