Abstract
We developed a method for flood risk assessment in Tokyo metropolitan area. We estimated damage by inundation inside a levee at each prefecture based on a statistical method used in damage insurance field. On the basis of estimated damage, we developed flood risk curves in the Tokyo metropolitan area, representing relationship between damage and exceedance probability of flood. By analyzing the flood risk curves, we found out regional differences of flood risk. We identified high flood risk in Tokyo and Saitama prefecture. On the other hand, flood risk was relatively low in Ibaraki and Chiba prefecture. We found that these regional differences of flood risk can be attributed to both entire property value and ratio of damaged housing units in each prefecture.
