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Pipe Spillway Plunge Pool Design Equations

by Fred W. Blaisdell, USDA, Agricultural Research Service, Stillwater, OK, USA,
Clayton L. Anderson, USDA, Agricultural Research Service, Stillwater, OK, USA,



Document Type: Proceeding Paper

Part of: Water for Resource Development

Abstract:

An equation is given to determine if scour holes will beach and widen excessively. For nonbeaching scour holes, dimensionless equations are given for the progression of scour with time and for the design of plunge pool energy dissipators for cantilevered pipe spillway outlets covering a range of discharges, pipe sizes, pipe heights, and bed material or riprap sizes. These equations are found to yield moderately conservative plunge pool sizes. Finally, the effect of a nonerodible layer on plunge pool dimensions is found to be minimal.

Subject Headings: Scour | Spillways | Pipe materials | Hydraulic design | Pipeline materials | Pipe sizes | Pipe bedding

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