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Prototype Hydraulic Tests of Flood-Control Conduit, Enid Dam, Yocona River, Mississippi.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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Field tests were made at Enid Dam to obtain data for determining the hydraulic characteristics of a flood-control conduit, including friction factor, intake loss, and exit-portal pressure gradient elevation. Pressure measurements were made in the straight, 11-ft-diameter conduit with the conduit flowing full, at full and partial gate openings, for a pool elevation 20 ft below the conduit design elevation. Plaster-cast impressions were made to determine the average sand-grain roughness of the conduit. Friction losses in the Enid conduit were higher than those measured in previous tests made at high Reynolds numbers in the Denison Dam conduit. The Enid conduit appeared to be hydraulically rougher than the Denison conduit. The friction factor determined from the plaster casts differed less than 15 per cent from the value determined from results of the hydraulic tests. The intake losses were computed and found to be somewhat lower than those for the Pine Flat and Denison Dam intakes. However, the comparison may not be significant because of differences in geometry of the three intakes. Exit-portal pressure gradient elevations compare closely with those measured in tests of other conduits. Vortex formation was noted above the conduit intake at full and partial gate openings.
APPROVED FOR PUBLIC RELEASE