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