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meodingu
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meodingu


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 Return period Empty
PostSubject: Return period    Return period EmptyThu Sep 30, 2010 2:07 pm


Return period
See also: 100-year flood

The likelihood or probability of an event with a specified intensity and duration, is called the return period or frequency.[93] The intensity of a storm can be predicted for any return period and storm duration, from charts based on historic data for the location.[94] The term 1 in 10 year storm describes a rainfall event which is rare and is only likely to occur once every 10 years, so it has a 10 percent likelihood any given year. The rainfall will be greater and the flooding will be worse than the worst storm expected in any single year. The term 1 in 100 year storm describes a rainfall event which is extremely rare and which will occur with a likelihood of only once in a century, so has a 1 percent likelihood in any given year. The rainfall will be extreme and flooding to be worse than a 1 in 10 year event. As with all probability events, it is possible to have multiple "1 in 100 Year Storms" in a single year.[95]



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