Irrigation Engineering
The main function of a divide wall is to

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

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Irrigation Engineering
Lane's weighted creep theory assumes

Equal weightage to horizontal and vertical creeps
Double weightage to horizontal creep and one weightage to vertical creep
Triple weightage to vertical creep and one weightage to horizontal creep
Triple weightage to horizontal creep and one weightage to vertical creep

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