Last edited 09 Dec 2020


Culvert, screen and outfall manual, (CIRIA C786) published by CIRIA in 2019, defines probability as: ‘Measure of the chance that an event will occur. Typically defined as the relative frequency of occurrence of that event out of all possible events and expressed as a percentage with reference to a time period, eg one per cent annual exceedance probability.’

It defines probabilistic as a: ‘descriptor of method or process in which the variability of input values (eg asset loading and strength) and the sensitivity of the results are taken into account to give results in the form of a range of probabilities for different outcomes (eg failure).’

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