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The cross drainage structure in which the canal bed level is kept much higher than the high flood level (HFL) of a stream is called :

  • Aqueduct. An aqueduct is just like a bridge in which instead of road or a railway, a canal is carried over a natural drain.
  • An aqueduct is constructed where the bed of the canal is well above the high flood level (H.F.L.) of the drain.
  • The canal water is taken across the drain in a trough supported on piers.
  • The drain water flows under the canal such that there is sufficient headway available between the H.F.L. of the drain and the underside of the canal trough.
  • The drain therefore flows at atmospheric pressure under the work. Generally an inspection road is provided along with the trough.