Question

Which of the following is a disadvantage of CD works carrying drainage over the canal?

(a) The arrangement is generally constructed when the drain is very big as compared to the section of the canal

(b) The damage caused by floods is not rare

(c) The CD works are more liable to damage than the earthwork of the canal

(d) The perennial canal is not open to inspection or maintenance

The question was asked in an interview for job.

My query is from Types of Cross Drainage Work topic in section Cross Drainage Work of Irrigation Engineering

Answer 1

The correct choice is (d) The perennial canal is not open to inspection or maintenance

Easy explanation: The main advantage of this arrangement is that the CD works are less liable to damage than the earthwork of the canal. The major disadvantage is that the inspection road cannot be provided along the canal hence, it is not open to inspection or maintenance.