Flow in Chute Spillway at Fort RANDALL Dam; Hydraulic Prototype Tests.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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Tests were conducted in the summers of 1960 and 1962 on the chute spillway of Fort Randall Dam to investigate the characteristics of the supercritical flow and provide data for use in future design work. Measurements were made at mean flow depths from 1.5 to 3.4 ft with average velocities from about 27 to 47 fps. Two specially built pitot piers were installed in the spillway chute to measure vertical velocity distributions. Depths of flows along the chute were measured with weighted wire gages. Water-surface depths measured on the chute spillway appeared to be close to the normal depths at the downstream end of the chute. Vertical velocity distibutions on the spillway slab were in good agreement with a logarithmic equation for the supercritical flow conditions of the tests. Flow resistance was relatively high, possibly due to the concrete spillway slab joints or water-surface wave effects in the supercritical flow. Equivalent sand grain roughness values and the slope of the velocity distribution curve agree with results of previous investigations. Similar tests at other projects would be of great value, especially if data were obtained in locations on the spillways where nonuniform flow conditions occur. Author
- Civil Engineering