Question

At which point in the entire canal system the duty of water will be more?

(a) Head of the Water-course

(b) Head of the Minor

(c) Head of the Distributary

(d) Head of the Branch

The question was asked by my college professor while I was bunking the class.

Question is taken from Water Requirements in chapter Water Requirements of Crops of Irrigation Engineering

Answer 1

Correct answer is (a) Head of the Water-course

To elaborate: As water flows from river to subsequent parts of the canal system some water losses takes place due to evaporation, and percolation. Due to this, the duty of water goes on increasing from starting point of canal system till its end point. Therefore, the duty of water is more at the last point of the system, i.e head of the water-course.