Abstract
Rainfall parameters such as peak intensity, cumulative rainfall, average intensity and duration were used to characterize the rainfall events triggering shallow failures on road slopes. From analysis of 258 rainfall records, the rainfall parameters were ranging from 6.5 to 92.5 mm/hour for peak intensity, from 76.4 mm to 759.5 mm for cumulative rainfall, from 7 to 255 hours for duration and from 1.19 to 22.2 mm/hour for average intensity. Examination of rainfall records to scrutiny showed that combination of rainfall parameters rather than single parameter should be used to represent the slope failure triggering rainfall characteristics. By relating these parameters, rainfall thresholds from peak intensity-cumulative rainfall relation and average intensity-duration relation for shallow slope failures were suggested.
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