A Simplified Method for Estimating Costs of Damage due to Floods Arising from Earth-dam Breaches

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  • ため池破堤による想定被害額の簡易評価手法
  • タメイケハテイ ニ ヨル ソウテイ ヒガイガク ノ カンイ ヒョウカ シュホウ

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Abstract

Earth-dam breaches arise from earthquakes and severe rainstorms and sometimes cause downstream floods. Floods have the greatest influential effect on hydraulic structures for irrigation and drainage, and estimating the costs of damage to these structures is important for risk assessment and management in agricultural land improvement projects. Although some methods for estimating damage costs have been proposed, most of these methods require many types of asset data and usually a long time because of complications. This paper proposes a simplified method for estimating damage costs in flood zones due to breach of earth-dams. The proposed method is based on asset data that are freely available, economical and easier to apply to practices in land improvement projects. Flood analyses of three actual earth-fill dams were performed, and the costs of damage in their flood zones estimated based on the results of the flood analyses using the proposed method. The proposed method estimated damage costs with ease, and accuracy was almost the same as other existing methods. Therefore, the proposed method can be a useful tool in agricultural land improvement projects.

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