Abstract
Recently, the serious inundation damage due to local heavy rain has increased. This study treated the inundation damage due to heavy rain in Kasugai city, Aichi prefecture, JAPAN that occurred on September 20, 2011. To make clear the inundation situation and discuss the countermeasures, the numerical simulation model was developed for the complex water behavior of overland flood flow, river flow and sewer flow. The detailed model of the water behavior in overland, river and sewer system is indicated. From analysis results, it was shown that the area with high inundation water depth of analysis results are good agreement with the actual inundated area. This analysis results shows the validity of this analysis model. Moreover, the inundation analysis method in consideration of the origin was developed by using the T-SAS. This analysis can show the transport of rain water separated by space or time. Therefore, it is possible to clarify the origin of the water gathered in the inundation area. Such obtained knowledge of transport of rain water is available for discussion of effective measures.
