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Hydraulics of Stepped Spillways for RCC Dams and Dam Rehabilitations

by K. H. Frizell, US Bureau of Reclamation, Denver, United States,



Document Type: Proceeding Paper

Part of: Roller Compacted Concrete III

Abstract:

Stepped spillways are natural extensions of roller-compacted concrete (RCC) placement techniques. Stepped spillways were first used with concrete dams, and designers are eager to use the same technology to pass flows over the top of embankment dams by providing erosion protection for the downstream slope of the dam. This paper will discuss the use of stepped spillways for both applications. Case histories of stepped spillway applications worldwide and the hydraulic advantages are given. Results from U.S. Bureau of Reclamation's (Reclamation) current research program to define the hydraulics of stepped spillways are presented. The forces and velocities produced by flow over the stepped spillway are quantified and an example of the benefit of reduced stilling basin lengths is presented.

Subject Headings: Concrete dams | Spillways | Embankment dams | Hydraulics | Case studies | Rehabilitation | Stilling basins

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