Question

The quantity of water flowing per hour per unit horizontal area is called ____

(a) Detention time

(b) Flowing through period

(c) Displacement time

(d) Overflow rate

The question was asked during an internship interview.

The above asked question is from Design of Sedimentation Tank in division Sedimentation and Chemical Clarification of Environmental Engineering

Answer 1

Correct answer is (d) Overflow rate

To explain I would say: Overflow rate = Q/A where Q is discharge rate in litre per day, A is the horizontal area in m^2.