IndiaBIX

Civil Engineering - Waste Water Engineering - Discussion

Discussion Forum : Waste Water Engineering - Section 1 (Q.No. 6)
Waste Water Engineering
6.
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is
1 in 60
1 in 100
1 in 120
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
29 comments Page 1 of 3.
Sandip ghosh said:   1 decade ago
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:   1 decade ago
@Sandeep.

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:   1 decade ago
Yes, the gradient, 1 in 105 is greater than 1 in 150.
Ganesh said:   10 years ago
Which formula is used here to calculate self cleansing formula?
Akash said:   10 years ago
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:   10 years ago
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.
Ritesh Dev Singh said:   9 years ago
By Shield's Theory,

Self - cleansing velocity (Vs),
Vs= √ {8kgd'(G-1)}÷f], where,
k= (1-n)sin θ.
Vaibhav gupta said:   8 years ago
Explain the expression for self-cleaning velocity.
Marwa said:   8 years ago
Which formula is used?

Please help me?
Himajwala said:   8 years ago
I didn't understand which formula was used. Can anyone help me?
Post your comments here:

Your comments will be displayed after verification.

Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers