Santa Ana River Design Memorandum Number 1. Phase 2 GDM on the Santa Ana River Mainstem, Including Santiago Creek. Volume 3. Lower Santa Ana River. (Prado Dam to Pacific Ocean)

摘要

The recommended plan will convey design outflows of 30,000 cu. ft/s from Prado Dam to 47,000 cu. ft/s at the Pacific Ocean. The project consists of acquisition of the post project overflow area along 8 miles of river just downstream of Prado Dam (Prado Dam to weir Canyon Road) and 23 miles of improved channel (Weir Canyon to the Ocean). The reach from Prado Dam to Weir Canyon would remain in a natural rural condition for wildlife and open space value. The improved channel will consist of sections of trapezoidal riprap or grouted riprap channel, trapezoidal concrete-lined channel and rectangular concrete-line channel. The ocean outlet will consist of rock mounded jetties. In addition, the Greenville-Banning Channel would be modified to join the Santa Ana River about 1 mile upstream of the Pacific Ocean. Talbert Channel will be relocated 1,000 feet upcoast from its present location to accommodate relocated 1,000 feet upcoast from its present location to accommodate widening of the Santa Ana River at the ocean. The channel access and maintenance roads would be incorporated into the overall recreational trail system for the entire river. A 92-acre marsh will be restored at the mouth of the river for the preservation and enhancement of wildlife. (FR)