When a river loses energy, it will drop or deposit some of the material it's carrying,
Deposition may take place when a river enters and area of shallow water or when the volume of water decreases, for example after a flood or during times of drought. It can also occur where wetted perimeter increases relative to the cross sectional area.
Flocculation can also occur- this is where clay particles bond together, I creasing their mass and therefore sink to the river or sea bed.
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