Question

Mathematically, depending on what factor we can say velocity increases the capacity of the canal?

(a) Coefficient of Viscosity

(b) Coefficient of Capillarity

(c) Coefficient of Roughness

(d) Coefficient of Resistance

The question was asked in an interview for job.

Origin of the question is Lining of Canal in chapter Lining of Irrigation Canals and its Economics of Irrigation Engineering

Answer 1

The correct answer is (c) Coefficient of Roughness

The explanation is: Coefficient of roughness is indirectly proportional to velocity in any mathematical formula, or condition, or equation. So, therefore the value of this coefficient is more for unlined canals than the lined canals. Hence the velocity is more for lined canals than the unlined canals and therefore capacity for lined canals is more.