Overtopping Protection for A. R. Bowman Dam

by Perry J. Hensley, US Bureau of Reclamation, Denver, United States,
Charles C. Hennig, US Bureau of Reclamation, Denver, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


Arthur R. Bowman Dam is a 245-foot-high (74.7-m) central-core rockfill dam located on the Crooked River in central Oregon. The probable maximum flood (PMF) would overtop the dam by 20 feet (6.1 m) with a peak unit discharge of 280 ft3/sec (7.93 m3/sec) over the embankment crest. Overtopping begins at 23 percent of the PMF. Twenty-three percent of the PMF corresponds to approximately the 500-year flood. Overtopping protection has been chosen as the modification to accommodate the PMF. The overtopping protection will consist of a continuously reinforced concrete slab placed over the entire downstream face of the dam similar to the upstream facings currently used on concrete faced rockfill dams. The continuously reinforced concrete slope protection provides an economically competitive modification that offers technical advantages over more commonly used slope protection alternatives. The continuous reinforcing provides monolithic behavior, controls crack openings, and eliminates crack offsets to create a nearly impervious barrier without protrusions into the flow. Other design features discussed include drainage, groin protection, crest details, and accommodations for fluctuating pressures in the hydraulic jump region.

Subject Headings: Rockfill dams | Wave overtopping | Reinforced concrete | Concrete dams | Embankment dams | Floods | Concrete slabs | Slope stability | Oregon | United States

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