A Method to Determine the Priority of Investment in Disaster Prevention for Rainfall-related Slope Failure

<b>A Method of Determining Priorities for Investment in Disaster Prevention for Rockfalls from Slopes</b>

“…It is necessary to evaluate the risk associated to individual slopes by considering the probability and potential costs of slope failure in order to effectively invest in slope failure prevention measures. We proposed a method to evaluate the potential for rainfallrelated slope failures using a risk assessment technique [1]. As a following step, we developed a method to evaluate the potential of rockfalls.…”

“…Figure 2 shows the events assumed to be associated with a rockfall onto a railway line, based on Fig.1. The hazard level of the rockfall risk is calculated by expected frequency and resulting costs as shown in (1). The expected frequency of the event is calculated by (2) based on …”

“…Each individual cost item is set more specifically according to statistical data available from past accidents. Figure 4 shows the flow of calculating rockfall hazard risk according to (1). Cost items in Fig.4 may have different values depending on the exact type of events.…”