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"Everything should be made as simple as possible, but not simpler."
- Albert Einstein

If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is

[A]. 1 in 60
[B]. 1 in 100
[C]. 1 in 120
[D]. none of these.

Answer: Option


No answer description available for this question.

Sandip Ghosh said: (Tue, Dec 9, 2014 05:14:21 PM)    
But actually 1 in 105 for a velocity of 0.9m/s & 1 in 150 for a velocity of 0.75m/s.

Aman Gautam said: (Wed, Dec 10, 2014 07:52:36 PM)    

Greater is the gradient, greater is the velocity. Thus your point is wrong and as for 225 mm diameter, velocity should be 1 m/s. So it would require the highest gradient.

Manohar said: (Thu, Jul 9, 2015 05:06:58 PM)    
Yes, the gradient, 1 in 105 is greater than 1 in 150.

Ganesh said: (Thu, Oct 29, 2015 07:35:15 PM)    
Which formula is used here to calculate self cleansing formula?

Akash said: (Sat, Dec 26, 2015 05:31:39 PM)    
V-under root (8 beta under f multiply by (specific gravity of solids- 1)*g*diameter of solids). Find v and using manning or any other formula find slope. But data is not sufficient.

Narayan said: (Sun, Jan 17, 2016 09:52:20 AM)    
Velocity of the sewer is 0.9 to 0.75 m^3/s.

So assume velocity of sewer V = 0.9 m/s.

And using the manning's formula:

V = R^2/3*s^1/2/n but the wastage flow is not specify.

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