Rainfall induced slope failures and debris flows at many spots killed 32 persons and damaged 4,785 residential houses in the vicinity of Hiroshima and Kure cities, Japan, on June 29, 1999. The rainfall record of this event was analyzed to seek a proper expression of triggering level to cause slope failure. And the geotechnical meaning of this triggering level of precipitation was studied through stability analysis considering the rise of ground water level. From these studies, it is concluded that the newly proposed rainfall index R_f is effective to judge the danger of rainfall condition for warning to evacuate.
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