Bureau Home » Water Information » Water Dictionary » average recurrence interval (ARI)

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Australian Water Information Dictionary

average recurrence interval (ARI)

The average or expected value of the periods between exceedances of a given rainfall total accumulated over a given duration. It is implicit in this definition that the periods between exceedances are generally random.

Related: annual exceedance probability (AEP)

This definition applies to:

• Glossary for Water status: Design rainfalls

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• Rain, River & Storage Data

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