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Question
Two different channels, M and N, in two differend sites are designed based on Lacey's theory, to carry same quantum of discharge. But the bed material of M is found to be finer than that of N.
A.
Channel M will have steeper longitudinal slopes
B.
Channel N will have steeper longitudinal slope 
C.
Channel M and N can have same longitudinal slopes
D.
Silting is more in M than in N.
Answer ( Option B)

Channel N will have steeper longitudinal slope 

Solution

Discharge in both the canal is same, now the channel with finer material will have less silt factor.
∴ Channel N will have steeper longitudinal slope.

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