Floodplain means the lowland and relatively flat areas adjoining inland and coastal waters including, at a minimum, that area subject to a one percent or greater chance of flooding in any given year. Wherever in this regulation the term floodplain is used, if a critical action is involved, floodplain shall mean the area subject to inundation from a flood having a 0.2 percent chance of occurring in any given year (500-year floodplain). Floodplain does not include areas subject only to mudflow until FIA adopts maps identifying M Zones.


44 CFR § 9.4

Scoping language

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