From 3 p.m. to 6 p.m. on July 16~(th), 2010, a heavy rainstorm of 125-173 mm suddenly attacked the 4 kmx4 km area in Kawakita- Cho and Saigo-Cho in Shobara city, Hiroshima Prefecture. Before this rain, an intermittent rain caused by a stationary front (Baiu- front) had continued in the area from the end of the June, and the water content of soil seems to have been close to the saturation. The sudden and intense rainfall caused a flood and a lot of slope failures and as much as 37 debris flow disasters, which took place almost simultaneously in the area at around 5 p.m., causing a fatality, 23 destroyed houses and other serious damages to the infrastructures and agricultural lands. Authors organized investigation team and conducted joint field investigation of the landslides and debris flow disasters on July 16th. The preliminary report includes the characteristics of the rainfall and the general description of slope failure and debris flow.
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