While deciding the alignment of a proposed canal taking off from a river at B, three alignments of approximately equal lengths areavailable.
These cross a drainages at C1, C2 and C3 where drainage bed levels C1 > C2 > C3, you will provide at site C3

an aqueduct
 
a syphon aqueduct
 
a super passage
 
a syphon.
 

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