July 2012, large-scale landslide dam occurred in Ambon Island, the Republic of Indonesia and it collapsed subsequent to overtopping and erosion in July 2013 after one year. Large-scale outburst flood induced by collapse of the dam swept two third of houses and buildings in Negeri Lima village which located in the downstream of the dam. However, casualties were three out of more than 5,000 villagers. After the formation of the landslide dam, the government of Indonesia and concerned organizations started to take necessary measures such as establishment of monitoring and observation system, setting of warning and evacuation criteria, evacuation drill and awareness program for villagers based on recommendations from Japan. In addition, aides were provided by Japan to strengthen water level monitoring system and to promote people's awareness activities more effectively. Reasons why casualties of disaster were minimized are considered as follows. One is all concerning parties including villagers understood necessary responses and actions in emergency situation in addition to phenomenon of landslide dam outburst flood. Second is continuous water level monitoring had provided indispensable information to enhance the adequate judgments and actions by all concerned parties. That is considered to have helped people understand the urgency of envisioned disaster. The fact mentioned above is great achievement made by Indonesian government, relevant local organizations, villagers and NGOs. And support from Japan functioned well to make their effort more effective. In order to encourage people to evacuate in case of emergency, quantitative and understandable indicators corresponding to the urgency of disaster are important. The case in this report is believed to provide a valuable suggestion in other disaster phenomena.
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