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The 90th percentile event is the rainstorm for which 90% of all rainstorms are this depth or less. In this example, using a very limited data set it was found to be 20 mm.
The 90th percentile event is the rainstorm for which 90% of all rainstorms are this depth or less. In this example, using a very limited data set it was found to be 20 mm.
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i.e. 90% of all storms ≤ 20 mm.
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Storms of ≤ 5 mm represent 40% of the total in this example.