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Title: Outlet works for New Hope Reservoir, Cape Fear River Basin, North Carolina : hydraulic model investigation
Authors: United States. Army. Corps of Engineers. Savannah District.
Melsheimer, Edwin S.
Oswalt, Noel R.
Keywords: Hydraulic models
Hydraulic structures
New Hope Reservoir
North Carolina
Outlet works
Stilling basins
Water flow
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-69-14.
Description: Technical Report
Abstract: Model investigation of the outlet works for the New Hope Reservoir was initially concerned with verification and improvement of the hydraulic design of the intake structure, conduit, and stilling basin. Subsequent tests involved observations of the effectiveness of the multilevel intakes in providing selective withdrawal of flow from the epilimnion or upper stratum of a stratified reservoir. The study was conducted in a 1:20-scale model of the outlet works which reproduced a portion of the approach area, the intake structure, the outlet conduit, the hydraulic-jump type stilling basin, and approximately 800 ft of exit channel. The proposed intake structure provided effective regulation of flood-control releases as well as those which are desired to provide quality water downstream during both summer and winter. However, certain operational procedures are necessary to prevent dangerous subatmospheric pressures in the throat section of the water-quality system. Flow conditions in the original conduit intakes, throughout the flood-control facilities, and downstream to the conduit outlet were satisfactory with pressure conditions remaining positive for all discharges with little or no fluctuation. There was no tendency for structural vibration with either flood-control or water-quality flows. Performance of the original design stilling basin was unacceptable as unstable hydraulic action and eddy formation resulted in very turbulent basin conditions with little or no energy dissipation. Raising the elevation of the basin and lengthening and modifying the transition section (types 2 and 3 basins) resulted in adequate, if not ideal, performance. Single gate operation produced unbalanced flow in the basin; however, as single gate operation is rarely necessary, types 2 and 3 basins are considered acceptable for prototype construction. It was determined that riprap protection is required on both banks of the exit channel.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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