Abstract

Sufficient investigation of flood flow is very important to protect an urban area from the flood disaster. Because flood flow is boundary condition for analysis of the overland flood flow, flood flow must be simulated in detail. In this study, the flood flow situation in the SHOUNAI River due to the heavy rain in Tokai district is simulated. This model consists 2D model for sea region and 1 D model for river. Though the problem of roughness coefficient remains unsolved, the computed results show good agreement with the observed water level. The control effect of Otai retarding basin in the SHOUNAI River is evaluated targeting heavy rain in Tokai district. It is shown that the control volume of Otai retarding basin is very small against the discharge of the SHOUNAI River during the Tokai heavy rain, there fore, the height of dike for Otai retarding basin must be evaluated for peak-cut.

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