Evaluation of the Flood Mitigation Function of an Agricultural Dam with Spillway Gates

Case study of the Anou Dam

Abstract

The influence of differences in release operations on flood mitigation function of an agricultural dam during a flood is simulated by means of runoff analysis and one-dimensional unsteady flow analysis in a case study of the Anou Dam. The results quantitatively showed that the differences in peak inflow discharge and peak release discharge decreased, and the flood damage in a downstream area increased with exclusion of artificial release operation during flooding. These results indicate that deterioration of maintenance and management system of the agricultural dam with spillway gates lead to failure of its flood mitigation function.