Floodplains are formed as rivers flood their banks when water volume exceeds its carrying capacity. This can happen following a heavy rain, as snowmelts or anything else that causes the water volume to increase. As the water receeds sediment or silt, solid material sucpended in the water, is deposited on the river banks. Courser, heavier material are deposited first on the rivers edge and finer silts further out. Floodplains develop over sucessive floods as more and more sediments is being deposited.
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