In this study, we surveyed the tsunami damage in Asahi City, Chiba, which was devastated by the tsunami. In addition, the damage caused by tsunami revealed the importance of soft countermeasures to supplement the disaster prevention functions of hard countermeasures. Therefore, we devised a method whereby residents hand down lessons from disasters. The inundation height above T.P. (Tokyo Bay mean sea level) was about 4.6 meters in Shimonagai, Asahi City. The tsunami run-up height in the district was about 5.1 meters. This reach point is consistent with the data from interviews with eyewitnesses. The method for handing down lessons from disasters is composed of four stages: (i) survey on disaster subculture, (ii) summary of the results of the survey, (iii) plan for implementation, and (iv) achievement of residents' evacuation.
