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Title: Spillway for Rend Lake Reservoir, Big Muddy River, Illinois : hydraulic model investigation
Authors: United States. Army. Corps of Engineers. St. Louis District
Fletcher, Bobby P.
Grace, John L.
Keywords: Big Muddy River
Hydraulic models
Hydraulic structures
Rend Lake Reservoir
Stilling basins
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; H-69-7.
Description: Technical Report
Abstract: Tests of the Rend Lake Reservoir spillway were conducted with a 1:16-scale model that reproduced a 129-ft length of the 435-ft-long main spillway, including a notched section with crest el 405.0 and two adjacent portions of the spillway with crest el 410.0, to study the adequacy of the spillway, stilling basin, and exit channel protective stone. After completion of tests concerned with the notched portion of the spillway, the notch was filled in and the model revised to permit study of flow conditions at the right abutment. Approximately 250 ft of approach channel and 500 ft of exit channel were reproduced to ensure proper flow characteristics. Particular emphasis was placed upon the selection of a stilling basin downstream of the notched section that would perform satisfactorily with the anti cipated tailwater depths, which are insufficient for ideal performance of a conventional hydraulic-jump type basin. Flow conditions in the approach, at the right abutment, and over the main spillway were satisfactory. Capacity of the spillway as determined by the model was approximately the same as computed. Performance of the original stilling basin was unsatisfactory in dissipation of all spillway discharges due primarily to the high unit discharge through the notched section. Four alternate designs were investigated and a stilling basin was developed that permitted adequate dissipation of energy. This basin consisted of a recessed portion downstream of the notched spillway which was 40 ft wide, 32 ft long, and 2 ft below the apron of the main stilling basin. Model tests indicated that riprap proposed in the approach for the original design was adequate. The original design riprap proposed for the exit channel was displaced with the original design stilling basin; however, the type 4 (recommended) basin maintained hydraulic-jump action and the riprap remained stable under all anticipated flow conditions.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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