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Stepped Spillway Design with a RCC Dam

by Kathleen L. Houston, US Bureau of Reclamation, Denver, CO, USA,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

The hydraulic model study results for the Upper Stillwater stepped spillway design are presented. The studies encompassed several spillway geometries and design unit discharges ranging from 25 ft**2/s (2. 3 m**2/s) to 123 ft**2/s (11. 4 m**2/s) under heads of 3. 5 ft (1. 1 m) to 9. 8 ft (3. 0 m). The major benefit of the stepped spillway is energy dissipation from flow down the spillway face that reduces the stilling basin length. The stepped spillway does not interrupt RCC placement and is therefore very cost effective. The wide application of the stepped spillway with RCC construction methods will be discussed.

Subject Headings: Spillways | Hydraulic models | Concrete dams | Hydraulic design | Construction methods | Infrastructure construction | Concrete construction

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