Answer :
The probability that a 100-year flood will occur at least once in 100 years is 1%.
What is an probability in math?
Probability is the branch of mathematics that studies the possible outcomes of given events together with the outcomes' relative likelihoods and distributions.
The term "100-year flood" is used to describe the recurrence interval of floods.
The 100-year recurrence interval means that a flood of that magnitude has a one percent chance of occurring in any given year.
In other words, the chances that a river will flow as high as the 100-year flood stage this year is 1 in 100.
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