One percent chance flood

One percent chance floodthe flood having one chance in 100 of being exceeded in any one-year period (a large flood). The likelihood of exceeding this magnitude increases in a time period longer than one year. For example, there are two chances in three of a larger flood exceeding the one percent chance flood in a 100-year period.

Source

28 CFR § 63.4

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Scoping language

Throughout this part, the following basic definitions shall apply:

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