Irrigation Engineering
Pick up the correct sequence of the part of a canal system from the following

Heads works-branch canal-main canal distributary, minor
Head works-main canal-branch canal-distributary-minor
Head works-main canal-branch canal-minor-distributary
Head work-distributary-branch canal-minor

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Irrigation Engineering
Lacy's regime condition is obtained if

Silt grade 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
Silt charge in the channel is variable

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