Abstract
In this study, we conducted a questionnaire survey in Yata district, Mabi town, where it suffered a great flood damage particularly in Okayama Prefecture by heavy rainfall disaster in western Japan in July 2018. By the sudden rise of the water level at night, it is difficult to judge in evacuation, and non-evacuees were delayed or made mistakes though the evacuation rate was high. In addition, hazard maps and disaster prevention activities were not linked to actual evacuation behavior. One of the factors that caused a large number of casualties in spite of the estimated flood area was the low evacuation rate of the elderly in their 80s and over, especially in those have 1-2 family members. Elderly people had difficulty evacuating in physical problems and mental ones, therefore, the evacuation rate was low. To prevent the spread of damage, it is important to establish a support system for evacuation of the elderly by strengthening connections within the area.
