Irrigation Engineering
The uplift pressure on the roof of an inverted syphon, is maximum when

Canal is running with F.S.L.
Canal is running dry
Drain in running dry
Drain is running with H.F.L.

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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
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 above the bottom of the canal 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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