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- DictionaryFlood·plain/ˈflədplān/
noun
- 1. an area of low-lying ground adjacent to a river, formed mainly of river sediments and subject to flooding.
noun
Area of land adjacent to a stream or river which stretches from the banks of its channel to the base of the enclosing valley walls, and which experiences flooding during periods of high discharge
A floodplain or flood plain or bottomlands is an area of land adjacent to a river. Floodplains stretch from the banks of a river channel to the base of the enclosing valley, and experience flooding during periods of high discharge. The soils usually consist of clays, silts, sands, and gravels deposited during floods. Because of regular flooding, floodplains frequently have high soil-fertility sinc... Wikipedia