Return Period
See also: 100-year floodThe likelihood or probability of an event with a specified intensity and duration, is called the return period or frequency. The intensity of a storm can be predicted for any return period and storm duration, from charts based on historic data for the location. 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.
Read more about this topic: Precipitation (meteorology)
Famous quotes containing the words return and/or period:
“Then came the Lord Chamberlain with his white staff,
And all the people began to laugh;
And then the Queen began to speak,
‘You’re welcome home, Sir Francis Drake.’”
—Unknown. Upon Sir Francis Drake’s Return from His Voyage about the World, and the Queen’s Meeting Him (l. 5–8)
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