抄録
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 (RT curve) can determine the class in which the present rain is. In this paper the parameters a, b of Talbot type RT curve determined by the six 10min 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 two heavy rain cases (Nagasaki, 1982 and Yamaguchi, 1985) show the heavy rain can be detected several ten minutes before its real beginning.
