It has been already constituted the date-base for controlling disasters on Rokko Mountains. The characteristic of slope failures can be analyzed from this dade base. Four problems are mainly discussed: (1) Analysis of conditions occurred slope failures and the classification of stability, (2) Relationship between rainfall intensity and the occurrence of failures devided with classes of stability. (3) Elapsed years and disappearance of failure. (4) An example utilizing the date base to estimation of sediment yield.
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