RELATION BETWEEN INUNDATION, BUILDING DAMAGE AND HUMAN DAMAGE, IN THE KUMA RIVER DUE TO REIWA 2 JULY HEAVY RAIN

Abstract

 This study aims to analyze relationship between flood inundation, building damage and human damage in the Kuma River basin due to Reiwa 2 July heavy rain. For this, we conducted field surveys for the height of water mark and situation of building damages. The observed results showed that the outflow of buildings were remarkable in the middle and upper reach of the Kuma River in which the river width was narrow. The results showed that the human damage was caused by the high inundation more than 5 meters and outflow of buildings, suggesting that the vertical evacuation did not work in this disaster scale. Although the inundation started after sunrise, there was a delay in escape, and it was necessary to call early evacuation action before bedtime.