Simulation of Rapid Reservoir Drawdown for Flood Control, Cowlitz Falls Project

by Robert H. A. Janssen, Bechtel Corp, San Francisco, United States,
Frederick A. Locher, Bechtel Corp, San Francisco, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


The Cowlitz Falls Dam is a run-of-river project, currently under construction on the Cowlitz River in Washington State, 23 Km downstream from the town of Randle. The requirements for reservoir drawdown during floods were that flood levels at Randle should not exceed those that would have occurred before construction of the dam, and that the rate of rise in water surface elevation downstream from the dam should not endanger anyone fishing or camping along the river banks. Initial steady state and sedimentation studies were used to determine the necessary water surface elevations for drawdown. The results of the reservoir drawdown simulation using the DAMBRK and UNET programs, and the drawdown procedure developed, are presented in this paper.

Subject Headings: Project management | Reservoirs | Drawdown (hydrology) | Floods | Occupational safety | Dams | Rivers and streams | Water surface | Washington | United States

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