Hydraulic design of sewers Flashcards
1
Q
What should be the flow velocities in the sewer?
A
The flow velocities in the sewer should be such that neither the suspended materials get silted up nor the pipe material got scoured up.
2
Q
What are the two limitations that limit the velocity in a system?
A
The first limitation limits the minimum velocity and the second limitation limits the maximum velocity.
3
Q
self cleaning velocity
A
0.45m/s
4
Q
max velocity
A
0.8 m/s
5
Q
Manning’s formula for determining flow velocity in sewers
A
v=1/nxR^(2/3)S^(1/2)
6
Q
What is R
A
R= hydraulic radius ; A/P; P is wetted perimeter
7
Q
What is S
A
open channel bed slope
