The effect of increasing diameter of sewer on the self cleansing velocity is
A. To decrease it
B. To increase it
C. Fluctuating
D. Nil
Answer: Option D
Solution (By Examveda Team)
Self-cleansing velocity is the minimum velocity required to prevent the deposition of solids and keep the sewer clean.It depends on the diameter of the grain (particle size) rather than the diameter of the sewer.
The self-cleansing velocity in a sewer is typically given by the formula:
v = k * sqrt(g * d * (G - 1) / f)
Where,
v = Self-cleansing velocity
k = Sediment coefficient
g = Acceleration due to gravity
d = Particle diameter
G = Specific gravity of the particle
f = Friction factor
From this equation, it is evident that self-cleansing velocity is independent of the sewer diameter.
Thus, increasing the sewer diameter has no effect on the self-cleansing velocity.
This Question Belongs to Civil Engineering >> Environmental Engineering
option D is correct . self cleansing velocity depends on dia of grain but not on the dia of sewer.
The self-cleansing velocity in a sewer is typically given by the formula: v = k * sqrt(g * d * (G - 1) / f), where "v" is the self-cleansing velocity, "k" is a sediment coefficient, "g" is the acceleration due to gravity, "d" is the particle diameter, "G" is the specific gravity of the particle, and "f" is the friction factor.
Dia. Self cleansing velocity(m/s)
150-200mm. 1
200-600mm. 0.75
>600mm. 0.6
So A is correct ans.
Self cleaning velocity is inversely proportional to ta dia of sewer
So and A is correct
Option A is correct . with increase in dia self cleansing velocity decreases according to Badwin Latham
self cleansing velocity depends on dia of grain but not on the dia of sewer