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Determination of Pulsating Pressures for Baldhill Dam, N.D. Spillway

by Bobby P. Fletcher, Waterways Experiment Station, Vicksburg, United States,
Gregory W. Eggers, Waterways Experiment Station, Vicksburg, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

Model tests of the existing Baldhill Spillway were conducted with symmetrical and asymmetrical gate openings to determine for various flow conditions the characteristics of the hydraulic pulsating pressures acting on the surface of the spillway chute and stilling basin apron. The 1:30 -scale model simulated the entire width and length of the spillway crest, gates, chute, and stilling basin, The model was capable of simulating various upper and lower pool elevations and discharges as high as 65,000, cfs. Pulsating pressures were simultaneously measured with 30 surface-mounted transducers located in turbulent areas. Data were collected with a data acquisition system capable of collecting data for various lengths of time and sampling at various rates. The test results provided sufficient information of the potential pulsation pressure acting on the surface of the spillway chute and stilling basin apron to enable to design decision to insure the integrity of the structure.

Subject Headings: Spillways | Hydraulic models | Stilling basins | Hydraulic pressure | Hydraulic loads | Hydraulic design | Dynamic pressure

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