Abstract

Recently in Japan, inundation due to heavy rainfall occurs frequently in urban area. An inundation flow model, which treats runoff from the mountainous area, flood flow in the river network, inundation flow in the drainage basin and drainage through sewerage system, is developed in this study. In the application of this model to Neya River basin, a low-lying area, flood control facilities are also taken into account, such as flood control zones, regulating ponds and pump stations.Consequently, it has been found out that this model can express the inundation process in urban area.

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