International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage



(7902) 100-year flood (one-hundred year flood)
The flood having a 1% or greater annual probability of occurrence. A flood event that statistically has a 1 out of 100 (or one percent) chance of being equaled or exceeded on a specific watercourse in any given year. A flood event of this magnitude is often used in US to determine if flood insurance is either advisable or required on a property.

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