Irrigation Engineering
Cross regulators in main canals are provided

To overflow excessive flow water
To increase water head upstream when a main canal is running with low supplies
To regulate water supply in the distributaries
None of these

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Irrigation Engineering
In a syphon aqueduct

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

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