The buildup of a flat valley floor bordering a river channel as repeated overbank floods deposit fine sediment across the surrounding land. Floodplains grow through lateral channel migration and vertical sediment accretion together, and their fertile deposits have long made them centers of settlement and agriculture.
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Partially Attested
Process TypeThe source describes flood deposits beside a river channel but does not name the atlas process-type category. Floodplain Formation
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1. Floodplain (Wikipedia)
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A floodplain or flood plain or bottomlands is an area of land adjacent to a river that stretches from the banks of the river channel to the base of the enclosing valley and experiences flooding during periods of high discharge.
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