Civil Engineering - Waste Water Engineering - Discussion
Discussion Forum : Waste Water Engineering - Section 1 (Q.No. 6)
6.
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is
Discussion:
29 comments Page 3 of 3.
Marwa said:
8 years ago
Which formula is used?
Please help me?
Please help me?
Vaibhav gupta said:
8 years ago
Explain the expression for self-cleaning velocity.
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.
Self - cleansing velocity (Vs),
Vs= √ {8kgd'(G-1)}÷f], where,
k= (1-n)sin θ.
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.
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.
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.
Ganesh said:
10 years ago
Which formula is used here to calculate self cleansing formula?
Manohar said:
1 decade ago
Yes, the gradient, 1 in 105 is greater than 1 in 150.
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.
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.
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.
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