Baffled Apron as Spillway Energy Dissipator

by Thomas J. Rhone, (M.ASCE), Head; Applied Hydr. Sect., Hydr. Branch, Div. of General Research, U.S. Bureau of Reclamation, Denver, Colo.,

Serial Information: Journal of the Hydraulics Division, 1977, Vol. 103, Issue 12, Pg. 2243-2257

Document Type: Journal Paper


Hydraulic model investigations were performed to determine basic design criteria for a baffled apron spillway as an energy dissipator. Described are the effects of baffle block heights and spacing of the hydraulic efficiency of the system. Impact pressures were measured on the upstream faces of the blocks to determine impact forces. Pressures on the side, top, and back of the blocks were also measured to determine the possibility of cavitation damage. Special consideration was given to develop alternative entrances to the baffled spillway. Three entrance configurations are proposed, two of which will not increase the upstream water level. The third entrance is similar to the conventional type used in contemporary designs. Typical design procedures are outlined. Included are the determination of ideal design discharge criteria which might be less than the expected maximum and how to modify the structure to handle discharges greater than the design.

Subject Headings: Hydraulic design | Baffles (hydraulic) | Spillways | Energy dissipation | Hydraulic models | Sustainable development | Pressure measurement | Rivers and streams

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