Page 46 - Design Considerations Based on Quantitative Risk Assessments for Slopes

L

QRA

V
Linear Risk Assessment

The annual probability a person losing his or her life by driving along a

road could be calculated as follows:

P LOL = (1 – (1 – P ) NR ) x V DT
ST

where,

NR = P x P TL (annual frequency that landslides will reach
L
the element)

P = Nv/24 x L/1000 x 1/ Vv (temporal spatial probability for
ST
road)

Nv is the average number of vehicles per day in a year

L is the average length of vehicle in metres

Vv is the average velocity of vehicle in km/hour

For linear societal QRA, frequency could be obtained by:

f = (1 – (1 – P ) NR )
ST