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|Flood control project on Lytle and Warm Creeks and Santa Ana River, California : hydraulic model investigation
|United States. Army. Corps of Engineers. Los Angeles District.
Ables, Jackson H.
Pickering, Glenn A.
Santa Ana River
San Bernardino County
|Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
|Technical report (U.S. Army Engineer Waterways Experiment Station) ; H-75-7.
Abstract: The Lytle and Warm Creeks and Santa Ana River project will provide another important unit under the general comprehensive plan for flood control in San Bernardino County, California. The proposed plan for containing the flood flows will consist of raising levees, excavating streambeds, and constructing grade control structures, energy dissipaters, bridges, and several thousand feet of high-velocity concrete channel. The investigation was conducted on a 1:60-scale model that reproduced approximately 10,000 ft of the Santa Ana River, 600 ft of East Twin Creek, and 5300 ft of Warm Creek. The existing and proposed bridges, concrete channels, and natural streambed channels with revetted slopes were also reproduced in the model. Tests were concerned with flow conditions, water-surface elevations, riprap stability, and sediment transport at the grade control structures, bridges, confluences, and energy dissipaters. Flow conditions through the East Twin Creek and Santa Ana River drop structures were satisfactory for all expected discharges. Flow piled up along the piers at the Interstate 10 (I-10) bridge complex because the piers were not aligned with flow. Thus a considerable water-surface differential developed on the piers. Efforts were made to correct this condition, but a feasible solution was not found. Similar problems were encountered with the Southern Pacific Railroad bridge piers due to an oblique hydraulic jump that formed in the channel with some discharges. Forces were measured on the critical piers at both bridges to assure adequate structural design for the unusual flow conditions encountered at these bridges. Tests revealed that flow conditions produced by the original design exposed rock energy dissipaters in Santa Ana River and Warm Creek were unsatisfactory. Baffle block energy dissipaters that were then developed for these areas resulted in satisfactory flow conditions with the design flows.
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