Survey Report of Sediment Disaster in Aranayake, Sri Lanka, on May, 2016

A large-scale sediment disaster occurred in Aranayake, Kegalle District, Sri Lanka, on 17 th, May, 2016, due to the heavy rainfall from the 15th May, 2016. The damage from the heavy rainfall is as follows (DMC (Disaster Management Centre) Situation Report as at 9 : 00, 13 th Jun, 2016). The number of deaths is 31 people, and 96 peoples missing at Aranayake. Therefore to understand the overall disaster situation of the sediment disaster area, we conducted an aerial survey by using a Sri Lankan Air Force chopper on 22 May and field survey on 8th to 9th and 21st to 22nd Jun as JICA (Japan International Cooperation Agency) Survey team. Further, we conducted numerical simulation to understand processes of this sediment disaster. In this report, we compiled two kinds of survey results and a proposal about the improvement of sediment disaster countermeasures in the future.