Abstract
Recently flood disaster has been more serious because a localized torrential downpour has occurred frequently. So the importance of flood hazard map has been increased in disaster prevention. However, existing flood hazard maps seem to have some problems, because the making of flood hazard map is left to each municipality, and the guidelines is not always clear. In this study, we performed a questionnaire survey with disaster management leaders of 46 municipalities in the Ishikari river basin. Also, we classified the cities/towns in the Ishikari river basin according to their characteristics of topography and considered the flood disaster type by the characteristics of topography. The problems and improvements on flood hazard maps became clear from these results.
