Rule Curve Operation at Terzaghi Dam to Pass the Probable Maximum Floodby M. C. Lee, B.C. Hydro, Canada,
Abstract: Terzaghi dam is located on the Bridge River, a tributary of the Fraser River. The spillway was originally designed for the 1000-year flood. Probable Maximum Flood (PMF) studies completed in 1987 showed that the total capacity of the spillway and low level outlets was capable of passing an equivalent of 50% of the PMF. Dam breach studies indicated that many developed areas downstream would be inundated if the dam failed. The Inflow Design Flood (IDF) was, therefore, selected to be PMF. It was found that, by adopting a rule curve for reservoir operation, the PMF could be passed with no modification to the spillway. This paper describes: the principles used to derive the rule curve which would permit passing the PMF at Terzaghi, the differences between rule curve operation and conventional methods for upgrading the discharge capcity, and the potential application of rule curve operation at other projects.
Subject Headings: Floods | Curvature | Distinguished engineers | Rivers and streams | Spillways | Dams | Hydraulic design
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