Question

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

(a) The damage caused by floods is not rare

(b) The canal is not open for inspection and maintenance

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

(d) During heavy floods, the foundations are susceptible to scour or waterway of the drain may get choked

This question was addressed to me by my school principal while I was bunking the class.

My question is from Types of Cross Drainage Work in division Cross Drainage Work of Irrigation Engineering

Answer 1

The correct option is (d) During heavy floods, the foundations are susceptible to scour or waterway of the drain may get choked

The explanation: In this arrangement, the canal is above the ground hence it is open to inspection. The damage done by light floods is rare. The CD works are less liable to damage than the earthwork of the canal when the canal passes below the drainage.