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top: a river at normal level
bottom: a river that has flooded and spread to low-lying areas on either side of the river
flood·plainalso flood plain (flŭd′plān′)
A plain bordering a river and subject to flooding at times of high water.
1. (Physical Geography) the flat area bordering a river, composed of sediment deposited during flooding
a nearly flat plain along the course of a stream or river that is naturally subject to flooding.
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|Noun||1.||flood plain - a low plain adjacent to a river that is formed chiefly of river sediment and is subject to flooding|