Recurrence Interval
Water
The average period in years between storm events equal to or larger than a given amount. The reciprocal of the probability of that storm event being equaled or exceeded in any year.
The average amount of time between events of a given magnitude. For example, there is a 1% chance that a 100-year flood will occur in any given year.
- — Service Hydrologist Reference Manual Glossary of Hydrologic Terms retrieved 2014-06-01