Irrigation Engineering
Lacy's regime condition is obtained if

Silt grade in the channel is variable
Channel flows in unlimited, incoherent alluvium of the same character as that transported material
Silt charge in the channel is variable
Discharge in the channel is variable

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Irrigation Engineering
Lane's weighted creep theory assumes

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

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