Irrigation Engineering
In a syphon aqueduct

Drainage passes over the canal and F.S.L. of the canal is above the bottom of the drainage trough
Canal passes over the drainage and H.F.L. of the drainage is above the bottom of the canal trough
Drainage passes over the canal and F.S.L. of the canal is below the bottom of the drainage trough
Canal passes over the drainage and H.F.L. of the drainage is below the bottom of the canal trough

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

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

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