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Encyclopedia > 100 year flood

A one-hundred year flood is calculated to be the maximum level of flood water expected to occur on average once every one hundred years. Sometimes, 500-year or 10,000-year floods are calculated (especially, in low lying countries, such as the Netherlands). The 100-year flood is sometimes referred to as the 1% flood, since there is a 1% chance of it occurring in any year. Based on the expected water level, an expected area of inundation may be mapped out according to elevation above sea level. This area figures very importantly in building permits, environmental regulations, and flood insurance. Look up flood in Wiktionary, the free dictionary. ... Impact of a drop of water. ... The examples and perspective in this article or section may not represent a worldwide view. ...

10-year floods have a 10% chance of occurring in any given year; 50-year flood, 2% chance; 100-year, 1%; 500-year, 0.2%; and 1000-year, 0.1%.

The mathematical field of extreme value theory was created to model rare events such as 100-year floods for the purposes of civil engineering. Extreme value theory is a branch of statistics dealing with the extreme deviations from the median of probability distributions. ...

100-year floods caused by over a week of continuous heavy rains ravaged Europe in 2002. In August of 2002 a 100-year flood caused by over a week of continuous heavy rains ravaged Europe, killing dozens, dispossessing thousands, and causing damages of billions of dollars in the Czech Republic, Austria, Germany, Slovakia, Poland, Hungary, Romania and Croatia. ...


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