A Risk Analysis and Management Plan for an ASAKAWA River Flood In Nagano City

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  • 長野市浅川流域の水害リスクマネジメントに関する研究
  • ナガノシ アサカワ リュウイキ ノ スイガイ リスク マネジメント ニ カンスル ケンキュウ

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Abstract

Flood disasters have occurred many times in our country as well as in the worldlike the big flood caused by hurricane Katrina, in 2005. The excessive loss of lives and assets is not acceptable. A risk aversion management technique for thesetypes of flood disasters is needed.<BR>In this study, the loss of assets like household goods and agricultural goods are analysed using the event tree analysis (ETA) provided rain fall flood return period of 100 year for the ASAKAWA River in northern NAGANO city. In addition to this, the action plan of citizens of Nagano city to manage the risks from disaster of floods is also analysed by the fault tree analysis (FTA). From this study, the estimated monetary total loss caused from a flood is so much that NAGANO citizens in the ASAKAWA River basin may not be able to hedge all risks by theirown effort. Therefore, some help and instruction schemes from the local government to share risks should be employed.

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