alluvial plain

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alluvial plain

[ə′lüv·ē·əl ′plān]
(geology)
A plain formed from the deposition of alluvium usually adjacent to a river that periodically overflows. Also known as aggraded valley plain; river plain; wash plain; waste plain.
References in periodicals archive ?
Moreover, juxtaposed alluvial terraces, present in this zone, attest on the vertical movement related to the recent activity on NW-SE to NNW-SSE fault.
Working on six alluvial terraces formed when successive eruptions of the Toba volcano temporarily blocked a valley in Sumatra, they used the large differences in age (and thus pH) of the soil on the terraces to index soil fertility.