Irrigation Engineering
When a canal flowing under pressure is carried below a natural drainage such that its F.S.L. doesnot touch the underside of the supporting structure, the structure so provided, is called

Super passage
Aqueduct
Syphon-aqueduct
Syphon

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Irrigation Engineering
In a syphon aqueduct

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
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

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