Centennial rising
A centennial rising is a Crue whose Probabilité of appearance one year is of , in term of Débit. In other words, the probability that its flow is reached or exceeded is each year of .
Thus, a centennial rising returns on average every 100 years, but does not occur necessarily every 100 years (there are in fact only 2 chances on 3d' to observe a centennial rising over one 100 years period). The same its occurrence one year does not exclude its repetition one or a few years later, since the rainy phenomena do not have a raison d'être related one year to the following one.
The hydrologist S generalize this classification of importance of believed and speak about raw n-ennales of which the flows have a probability of being reached or exceeded each year, of (and who thus appear on average all N years). One usually speaks about risings annual, biennial, triennial, quinquennial, decennial, centennial, millénale…
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