Question

The expression for the self cleansing velocity is given by ____________

(a) (8*B* (G-1) *g*d/f)^1/3

(b) (8*B* (G-1) *g*d/f)^ 2

(c) (8*B* (G-1) *g*d/f)

(d) (8*B* (G-1) *g*d/f)^1/2

I have been asked this question by my school teacher while I was bunking the class.

Query is from Minimum and Maximum Velocity of Flow topic in division Hydraulic Design of Sewers of Environmental Engineering

Answer 1

Right answer is (d) (8*B* (G-1) *g*d/f)^1/2

The best I can explain: The self cleansing velocity V is given by V = (8*B* (G-1) *g*d/f)^ 1/2 Where, G is the specific gravity, g is the acceleration due to gravity, d is the diameter of sewer and f is the Darcy Weisbach friction factor.