ANALISIS OF FLOOD DAMAGES IN THE 2018 HEAVY RAINFALL WITH FORCUSING ON BUILDINGS LOCATION AND ITS CHANGING PROCESSES

Abstract

In this study, we analyze relationships between buildings location and flood damages in Mabi town, Okayama prefecture, and Ozu town, Ehime prefecture, Japan, where serious damage occurred due to the Heavy Rainfall in July 2018. We develop a historical building points database and apply the database to the damaged areas in order to compare building age and flood depth. The result shows that the 70 % of high damaged buildings (inundation depth: 2.0-2.5) in Mabi were built after 1979, and the buildings in both towns have moved into the high flood risk areas thorough their history. The “levee effect” are observed in the both towns, however, different development processes were existed in each towns.