Irrigation Engineering
The main function of a divide wall is to

control the silt entry in the canal
prevent river floods from entering the canal
provide smooth flow at sufficiently low velocity
separate the undersluices from weir proper

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Irrigation Engineering
As per Lacey’s theory, the silt factor is

directly proportional to average par¬ticle size
directly proportional to square root of average particle size
inversely proportional to average par¬ticle size
not related to average particle size

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