Abstract
The writer picks up marked heavy storms which caused many slope slides at miscellaneous places in our country and moreover the time when a comparatively large-scale slides happened is distinct. And then, he described rainfall mass curves and ploted an arrow or arrows indicating the time of slides on each curve. The relations among slope characteristics, accumulated rainfall by the said time, and steep-slope portion of the curve at each slope, are carefully examined by the writer. And also, whether the said rainfall which infiltrated into the slope surface layer was able to build up a certain stored water depth on the less permeable subsurface layer which is one of the necessary conditions for surface slides at each slope, was carefully investigated. The writer concluded that there are frequent occaisions when only the infiltrated water can not cause the slide and at the same time ground water in fractured zones existing at the slope, increases its water head and discharge from the fracture tops which forms the stored water in the surface layer in the case of violent rain.
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