Nationwide Distribution and Characteristics of Low-rise Residential Areas at Risk of Flooding with Inundation Depths of 3m or Greater

In low-rise residential areas with the height regulations of 10 or 12 meters, constructing buildings with three or more stories to mitigate flood damage is challenging.However, in some of these areas, residences may be fully submerged by floods of 3 meters or more.This study tabulated the national distribution of such "highly inundated low-rise residential districts" and analyzed their land use and demographics.The results showed that these districts are dispersed across Japan, exhibiting variations based on population changes, farmland percentages and flood frequency.For each district, further argument on its future vision is necessary, considering both the current physical environment and the different interests and values of various stakeholders.