A 100-year flood or storm is an event that has a 1 percent chance of occurring in any given year.
via Discovery News http://news.discovery.com/earth/weather-extreme-events/what-is-hundred-year-flood-130913.htm#mkcpgn=rssnws1
via Discovery News http://news.discovery.com/earth/weather-extreme-events/what-is-hundred-year-flood-130913.htm#mkcpgn=rssnws1
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