When the levels are such that the F.S.L. of the canal is much above the bed level of the drainage trough, so that the canal runs under syphonic action under the trough, the structure provided is known as

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A canal syphon is a structure where the canal water flows under a drainage trough, utilizing syphonic action due to the canal's Full Supply Level (F.S.L.) being much higher than the bed level of the drainage.

When the Levels Are Such That the F