Study on the debris flow disasters occurred in Chugoku and Northern Kyushu due to the 2009-7 Heavy Rain and the prevention to debris flow disaster

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(1)Outline of the disasters : Due to the heavy rain in July 2009, a number of debris flows and landslides occurred in Hofu area and northern half of Fukuoka prefecture, and totally 27 people were killed. (2)About the mudflow disasters : Mud flow disasters in Hofu occurred as the houses were buried by the mud flows, after the big stones in the debris flows had settled out. Examinations from geotechnical approach, the relationship between the occurrence of the landslides at decomposed soils and pore pressure has been implied. Analysis done for debris flow at Ishihara evaluated quantity of the mud washed out, and the effectiveness of the Sabo structure has been confirmed. (3)Information transmission and the system for precaution/ refuge : The present situation and the problems to be solved have been made clear for the gathering/ transmission of the information for disaster prevention/refuge, the establishment of the precaution/refuge system, and the establishment of the precaution/refuge system at the zones where the specification of the precaution to debris flows/landslides have been given.