Page 53 - Design Considerations Based on Quantitative Risk Assessments for Slopes
P. 53
Quantitative Risk Assessment
Frequency of Landslide
▪ Qualitative Frequency of Landslide (AGS, 2000)
Description Indicative Slope Estimated Annual Class Name
Condition Probability
Landsliding is imminent Actively ➢ 10 -1 Frequent
unstable
Landsliding should be expected Unstable ➢ 10 -2 Probable
within the design lifetime
Landsliding is possible within the Marginally ➢ 10 -3 Occasional
design life, but not likely stable
Landsliding is highly unlikely, but not Stable ➢ 10 -4 Remote
impossible within the design lifetime
Landsliding is extremely unlikely Stable ➢ 10 -5 Improbable
within the design lifetime
Landsliding will not occur within the Stable ➢ 10 -6 Negligible
design lifetime
