抄録
The authors investigated the relation between the characteristics of precipitations and soil losses caused by rain on the plots after potatoes and barley harvested, in 1951. From the results it was obvious that the soil loss occured by the rain which showed maximum intensity 2mm per 10 minutes, and increased extremely on 3-4mm per 10 minutes. And the rate of minimum infiltration velocity decreased extremely when the maximum intensity showed more than 2mm per 10 minutes. From these results, considering the frequency and duration of precipitations, it is determined the critial intensity off dangerous precipitator as 2mm per 10 minutes, tentatively.
Then, using the observational data from 1944 to 1951 of the Kutchian Meteorological Station, calculated she seasonal occurence of dangerous precipitations. As the total precipitation, dangerous precipitation and frequency of dangerous rainfall altogether showed the maximum value at September, so it was suggested that this month is the most dangerous for soil erosion, especially at the first decade of the month. As it was observed that among the dangerous precipitations, the rain with the critical intensity (2.0-4.0mm/10min. max.) occurred most frequently, so it was suggested that the soil erosion would be able to control by adequate soil management.
