Abstract
The heavy rain disaster is increasing in Japan. Activities of the disaster risk management based on communities are important in small and aged community. The purposes of this paper are arranging the subjects of the community based disaster prevention activities and supporting to flood risk in these community. The research region is Susa distrct in Hagi city which the record torrential rain fall caused heavy flood disaster on 28th September, 2013. Social researches were carried out for this disaster. Official announcement time for evacuation advisory was later than the standard. The residents evacuated in the very dangerous situation. The local government should give refuge preparation informormations considering with necessary time for refuge of aged persons.