Likelihood table

Once the land use and consequences have been determined, only then should the likelihood be evaluated. For example, if a natural hazard event has a return period of 1:100 years, then using the table below this event would be considered to be “possible” (level 4). Similarly if a natural hazard even has a return period of 1:500 years, then it would be considered to be unlikely (level 3). The level calculated for the natural hazard is needed to be able to complete the risk-based approach (Step 4).