Return Period or 100-year flood The likelihood or probability of an event with a specified intensity and duration, is called the return period or frequency.[81] The intensity of a storm can be predicted for any return period and storm duration, from charts based on historic data for the location.[82] 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.[83] ~SupremeAdmin
Posted on: Tue, 20 Aug 2013 05:57:31 +0000
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