Question

Which type of borrow pits are preferred more?

(a) External Borrow Pits

(b) Internal Borrow Pits

(c) Borrow pits

(d) Spoil Banks

I got this question by my college professor while I was bunking the class.

This question is from Cross-Section of an Irrigation Canal topic in chapter Sediment Transport and Irrigation Channels Design of Irrigation Engineering

Answer 1

Right answer is (b) Internal Borrow Pits

To explain: The pits which are dug outside the canal are called external borrow pits and which are dug somewhere within the canal are called internal borrow pits. Internal borrow pits are preferred because bringing soil from distances is costlier than finding it near the canal itself. Moreover, there is a problem of mosquito nuisance in the external pits due rainwater collection.