Lateral side weirs on channels are widely used in irrigation and flood regulation. They are installed at the bank along the main-channel with the purpose to divert or spill in a controlled manner water over their crest when the water level in the channel exceeds a certain limit. This lateral loss of water is responsible for the reduction of sediment transport capacity in the main-channel by decreasing the bottom shear stress. This yields to the formation of sediment deposits which raise the bed level locally. As a consequence, the design discharge to be diverted over the side weir is increased. By the help of an experimental setup the physical processes in the main-channel and on the side weir were analyzed systematically. The test series confirm the processes mentioned above. These processes are strongly transient showing a tendency towards an equilibrium state of the river bed.
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