American Society of Civil Engineers

Comparison and Two Operation Rules for Gated Spillways: Application to Karkheh Dam

by A. Salehi, (MSc Student of Civil Engineer Dept., Iran University of Science & Technology (IUST), Resalat Sq., Hengam Ave., Daneshgah St., Tehran, Iran, 16844, P.O. Box: 16845-155. E-mail:
Section: Hydraulics and Waterways, pp. 2468-2477, (doi:

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Document type: Conference Proceeding Paper
Part of: World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability
Abstract: Two different operation policies for routing flood hydrographs through reservoirs is presented and their performances are compared. The first approach is a multi-stage operating policy in which releases are based on control levels to be determined. This study adopts the eight stages approach for which eight critical control levels are determined. Each control level is related to given percentage of design flood volume. As a critical control level is reached, the discharge through the spillway and gate opening is accordingly increased. The second approach is a multi-discharge operating policy in which control discharges are defined to minimizing the downstream flooding. Control levels associated with these control discharges are determined with the highest priority given to dam safety. Both models are employed to route flood with return period of design spillway through Karkheh reservoir and associated peak reduction discharges are compared.

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