Abstract
Japan Cabinet Office has published the first countermeasure report for enormous deluges in April 2010. This report showed various flood-disaster scenarios and factors which widened damages. One of important suggestions was to transmit precious information for long-distance evacuation. So far, local municipalities have made Flood Hazard Map to inform residents risk and evacuation. In this paper, cognition and effectiveness of a flood hazard map in the down ARAKAWA river Tokyo were measured by social questionnaire survey. In conclusion, there were 3 factors to effect validity of a flood hazard map. There were (1)commitment to their neighborhood organization, (2)experience of Kathleen typhoon in 1947 and (3)level of using target river. And a classification chart for designing risk-communication strategy was proposed.
