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Title: Chute spillway for Big Sioux River, Sioux Falls, South Dakota: hydraulic model investigation
Authors: Cooper, Deborah R.
Keywords: Channel realignment
Energy dissipation
Flood control
Sioux Falls
Stilling basin
Water surface
Wave heights
Publisher: Coastal and Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; CHL-97-18.
Description: Technical report
The Big Sioux River flows through Sioux Falls, Located in Minnehaha County, South Dakota. A Reconnaissance Study completed in 1988 identified a Federal interest in upgrading the existing flood-control project at Sioux Falls by raising the levees. A diversion channel bypasses the 25.7-km (16 mile lop of the Big Sioux River avoiding the populated downstream area and a 24-m (80-ft) drop at the natural falls downstream of the downtown area. The city of Sioux Falls requested U.S. Army Corps of Engineers assistance in 1969 because of a heavy snow pack and other conditions conducive to a major flood event. The 1969 event had an estimated discharge of 840 cu m/sec (30,000 cfs) passing thorough the diversion spillway chute still basin and levee overtopping between the diversion dam and Western Avenue on the Big Sioux River. The Bureau of Reclamation Type III basin, designed for 672 cu m/sec (24,000 cfs), withstood an 840-cu-m/sec (30,000-cfs) discharge with a tailwater below the original design tailwater for several days with minor damage. The levee across the channel from the diversion spillway chute stilling basin suffered erosion damage and was in danger of being breached. A 1993 Feasibility Report by the Omaha District examined deepening the stilling basin was based on sound engineering procedures.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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