In this study, a comprehensive inundation flow model, which comprises one-dimensional unsteady flow model, two-dimensional inundation flow model and runoff model using kinematic wave method, is developed and is applied to the Isahaya low-lying area, Nagasaki Prefecture. The validity of this model is considered by comparing with the actual records of inundated area and water level of the river network. Then, as the application example of this model to countermeasures against flood disaster, the

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... ffects by extending pump capacity and installing hypothetical pump stations are discussed.