Irrigation Engineering
Lacy's regime condition is obtained if

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

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Irrigation Engineering
A deep well

both (A) and (B)
has more discharge than a shallow well
is always deeper than a shallow well
is weaker structurally than a shallow well

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