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A levee or embankment are two names of flood defences used to keep flood water in the river channel.
Levee
An embankment built along the side of a river to control flooding can be called several things. Probably levee is the most common, but it can be dike or floodbank. It can also be called what you called it, an embankment.
An embankment could mean a raised bank along a river as part of flood defences.
Levee
Levee
The "Main Channel".
The River Channel is just before the the river meets the mouth or sea.
The embankments on a river bank that help to contain and direct the water are called different things, depending on where you live. They can be called levées, dikes, stopbanks, floodbanks or sometimes just embankments.
banks
Embankment