They have increased the fertility is true for floodplains.
What is floodplains?
A floodplain, also known as a flood plain or bottomlands, is a region of land next to a river that stretches from the channel's banks to the base of the valley's surrounding walls and is subject to flooding during times of high discharge. The soils are typically made up of clays, silts, sands, as well as gravels that have been left behind by floods. Floodplains frequently possess high soil fertility because regular flooding can deposit nutrients and water; some significant agricultural regions, like the Mississippi river basin as well as the Nile, heavily rely on the flood plains. Due to the rich soil and fresh water, both agricultural and urban regions have grown close to or on floodplains. However, the likelihood of flooding has prompted greater efforts to prevent flooding.
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