A Prediction of the Heavy Rainfall Producing the Slope Failure, Using 10 Minute Rainfall Data Base

Ochi (1973) proposed the heavy rain classes according to their damages by use of the maximum 3 hour and 1 hour rainfall amounts in the rainfall. This means that the parameters of maximum rainfall intensity curve (R_T curve) can determine the class in which the present rain is. In this paper the parameters a, b of Talbot type R_T curve determined by the six 10 minute rainfall data within an hour are used to make diagnosis how the present rain ranks in the rain classes and if it will be a heavy rain. Analytical results in four heavy rain cases (Nagasaki, 1982,Yamaguchi, 1985,Northern District of Kyusyu, 1980 and Kagoshima, 1986) show the heavy rain can be detected several ten minutes before its real beginning.