For Any Mathematicians: 100 Yr Flood FEMA Statistics ?

Hello:

For all you mathematicians out there:

Was reading a FEMA site the other day, where they discuss the "100 year
flood" meaning.

Their definition is essentially that in ANY given year, the probability is
(therefore) 1 % that
there will be a flood that year. Makes sense, I guess.

But they also deduce, somehow, that over a 30 year period (they take that as
the life of a typical mortgage) the probability is 26 % that there would be
a flood.

Any idea how they can deduce the 26% figure from what I mentioned in the
first paragraph ?

Thanks,
Bob


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