The probability that a 100-year flood will occur at least once in 100 years is 1%.

Name: The probability that a 100-year flood will occur at least once in 100 years is 1%.
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The probability that a 100-year flood will occur at least once in 100 years is actually higher than 1%. The term "100-year flood" means there is a 1% chance of such a flood occurring in any given year, not over a century. When calculated over 100 years, the probability increases significantly due to the cumulative risk each year.

The Probability That a 100-Year Flood Will Occur at Least