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A channel is stable when all particles along the wetted perimeter are not moving.
The erosion of composite river banks is a complex process involving several factors that include the following phenomena:
• Fluvial erosion
• Seepage erosion
• Cantilever mass failure

Bars are large bedform configurations that form due to alluvial bed deposits.
Tributary bars are formed near a river Confluence.
In Lane’s Relationship, equilibrium conditions exist between hydraulic states on one side and sediment conditions on the other side.
Riverbed degradation is used to describe the lowering of bed elevation due to erosion.
A river meander is a pair or pairs of loops that are in opposite directions in a river channel.
The equilibrium of alluvial channels implies a balance between incoming and outgoing water discharge and sediment load.