Irrigation Engineering
If there are two canals taking off from each flank of a river, then there will be

two divide walls and two undersluices
two divide walls and one undersluice
one divide wall and one undersluice
one divide wall and two undersluices

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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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