For the storm sewer system shown below, determine the required diameter of the sewers; extended from inlet No.1 to inlet No.2 (L-60m), extended from inlet No.2 to inlet No.3 (L=80m), and outgoing from inlet No.3. Assume the flow velocity in sewers at full flow condition is 0.8m/sec and Manning roughness coefficient is 0.013. Inlet No. 1 2 3 Drainage area (m²) 10000 15000 20000 Overland flow time (min) 5 6 12 Runoff coefficient 0.2 0.3 0.4
For the storm sewer system shown below, determine the required diameter of the sewers; extended from inlet No.1 to inlet No.2 (L-60m), extended from inlet No.2 to inlet No.3 (L=80m), and outgoing from inlet No.3. Assume the flow velocity in sewers at full flow condition is 0.8m/sec and Manning roughness coefficient is 0.013. Inlet No. 1 2 3 Drainage area (m²) 10000 15000 20000 Overland flow time (min) 5 6 12 Runoff coefficient 0.2 0.3 0.4
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Sanitary engineering
Q=CiA

Transcribed Image Text:For the storm sewer system shown below, determine the required diameter of the
sewers; extended from inlet No.1 to inlet No.2 (L-60m), extended from inlet No.2
to inlet No.3 (L-=80m), and outgoing from inlet No.3. Assume the flow velocity in
sewers at full flow condition is 0.8m/sec and Manning roughness coefficient is
0.013.
Inlet No.
1
2
3
Drainage area (m²)
10000
15000
20000
A3
Overland flow time (min)
5
6
12
Inlet No.3
A2
L=80m
1-3
60m
Inlet No.2
Runoff coefficient
Inler No.1
0.2
0.3
0.4
A1
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