Average Recurrence Interval (ARI) definition

Average Recurrence Interval (ARI) means the long-term average number of years between the occurrences of a flood as big as or larger than, the selected event. For example, floods with a discharge as great as, or greater than, the 20 year ARI flood event will occur on average once every 20 years. ARI is another way of expressing the likelihood of occurrence of a flood event.
View Source

Examples of Average Recurrence Interval (ARI) in a sentence

  • The WLEP identifies areas within Waverley that are prone to flooding in a 1 in 100 year Average Recurrence Interval (ARI) flood event.