Abstract
A debris flow has occurred at torrent Nishinogaito-gawa, in Fujiwara-cho in Mie prefecture on August 19 th, 1999. Heavy rainfall of more than 50mm/h was the most effective factor for the occurrence of the debris flow. There was no damage by the debris flow according to the existence of check dam just constructed and the warning system. A small scale debris flow at the same torrent in 1998 has forced to construct this facilities and it has fully functioned.
