Ottawa RiverRegulationPlanning BoardCommission de planificationde la régularisationde la rivière des Outaouais

INCREASING FLOOD RISK ALONG THE OTTAWA RIVER (Mattawa to the Montreal Region). See the River Conditions Forecast message that is updated daily. Read more

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Glossary

B D F I P R T W
Pe Pr

percentile

A type of statistical representation of a value in terms of percentages.  For example, the 25th percentile is the value below which 25% of historical flows or levels are found, and above which 75% are found.

probability of occurence

The chance or likelyhood that an event will happen over a period of time.