where there are meanders, the river flattens the land by eroding it and depositing sediment on it, making a flat floodplain. if the river gets too full and bursts its banks, water floods over the floodplain.
the water slows down, loses energy and deposits load which is fertile. the heavier, larger particles are deposited first, building up on the river bank while smaller particles can be carried further across the floodplain. this means over time the riverbanks will build up called levees.
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