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To avoid sediment deposits in the downstream portion of irrigation channels, the outlets must extract a concentration equal to or higher than the one in the channel. In Pakistan, although channels have been designed in that way, the present management leads to a general deposition of sediments. A few concentration measurements and the use of a 3D model of one outlet suggest that the sediment discharge in the outlet is close to the one contained in the current tube entering the outlet. Finally, a simple model with one parameter is proposed to compute the sediment concentration in the outlet.
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Belaud et al. (2001) studied this question.
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