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I believe Tony Hyde mischaracterized the frequency of 100-year floods. He said that they have a 1 in 100 chance of occuring each day, which would mean that they are likely to occur about once each winter. They actually have a 1 in 100 chance of occuring in any given year. However, there's no reason why a 100-year flood won't occur twice in a decade, or in two consecutive years, or even twice in a year. Also, the prediction is usually based on data that has been collected for less than 100 years, meaning that it is highly inaccurate. It also doesn't necessarily take into consideration recent climate and land use changes that may influence flood frequency.

posted 4 years, 5 months ago
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