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partial flow in pipe system, manning formula application. to determine partial flow in pipe
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MANNING'S EQUATION FOR PIPE FLOW
Project: Location:By: Date:
Chk. By: Date:
INPUTq= 0.03
0.2
Mannings Formula 0.011q=
0.011R=A/P
A=cross sectional area
P=wetted perimeter
S=slope of channel Q=V x A
n=Manning's roughness coefficient
Solution to Mannings Equation Manning's n-values
Area,m2 velocity m/s flow, m3/s pipe dia, m PVC
0.0209 0.3624 0.0577 1.42 0.0298 180 0.230739500208PE (<9"dia)
Selected 0.0210 0.3684 0.0570 1.4123 0.0297 211.0967 0.20 PE (>12"dia)
PE(9-12"dia)
CMP
ADS N12
HCMP
Conc
Q=(1/n)ARh2/3S1/2
V=(1/n)Rh2/3S1/2
Wetted Perimeter, m
Hydraulic Radius, m q degree
Design based on 1/2
flow
d qD
m3/smmmannings coeffdegreesslope m/m
Manning's n-values
0.01
0.015
0.02
0.017
0.025
0.012
0.023
0.013
MANNING'S EQUATION FOR PIPE FLOW
Project: Location:By: Date:
Chk. By: Date:
INPUT
D= 0.2 md= 0.1 m
Mannings Formula n= 0.011 mannings coeffq= 180.0 degreesS= 0.011 slope m/m
R=A/P v= 1.29 m/s
A=cross sectional area d/D 0.5
P=wetted perimeter
S=slope of channel Q=V x A
n=Manning's roughness coefficient
Solution to Mannings Equation Manning's n-values
Area,m2 velocity m/s flow, m3/s PVC 0.01
Design 0.0157 0.3142 0.0500 1.29 0.0203 PE (<9"dia) 0.015
Actual 0.0164 0.3621 0.0452 1.21 0.0198 PE (>12"dia) 0.02
PE(9-12"dia) 0.017
CMP 0.025
R ADS N12 0.012
R 0.037055 HCMP 0.023
q 83.39509 Conc 0.013
D 0.15d 0.131
d/D 0.873333
Q=(1/n)ARh2/3S1/2
V=(1/n)Rh2/3S1/2
Wetted Perimeter, m
Hydraulic Radius, m
d
q
D