Abstract
In this study, the degree of saturation and the effective rainfall amount were reviewed in terms of the consistency of their time-dependent changes when two experimental embankments having different degree of compaction were collapsed by rainfalls. As a result, the consistency with the effective rainfall amount calculated with the use of the degree of saturation and a small half-value period was confirmed for the low density embankment, which presented progressive failure due to the increased saturation level. On the other hand, the relationship between the degree of saturation and the effective rainfall amount could not be confirmed for the high density embankment where dominant collapse form was gully erosion.
