In Wakayama prefecture, Kii Peninsula disaster in 2011 caused serious damage due to deep-seated landslides and river blockages. So, we found that the appropriate evacuation behavior of residents at the time of sediment-related disasters is important. As a case of the past disaster in Wakayama prefecture in 1953, the disaster in the Arida River basin large damage occurred due to the slope failures occurred in Hanazono Village (Now Katsuragi Town) and the river channel blockage being destroyed. On the other hand, in some districts, people protected themselves by rapid evacuation behaviors. In this research, we focused on the actions of people who could evacuated of warning area absence of warning evacuation information like in recent years. So, we listened to the person who experienced the disaster in 1953. We have found that people who could evacuate knew that evacuation sites and have the knowledge of sediment-related disasters. So, they could evacuate rapidly and it led to the reduction of the damage.
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