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Contrary to the above answer, statistics do not work that way. A 100-year flood has a 1% chance of occurring in any given year. That does not mean that there is a 100% chance in a century, just as tossing a coin twice does not guarantee that you will get heads. The probability of a 100 year flood can be found with the following formula:

P=1- (0.99)^n

P is the probability expressed as a decimal. Multiply this by 100 to get a percentage.

n is the number of years.

In this case the chance of a 100 year flood occurring in any 100 year period is about .63 or 63%.

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9y ago

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The probability is 1.

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12y ago
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Q: What is the probability of a 100 year flood in a 100 years?
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