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:
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- Murray Darling Basin water information
- Water Act 2007
- Water Regulations 2008
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