Manning's coefficient or constant Calculator

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Properties of Surfaces and Solids

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Flow in Open Channels

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✖Chezy's constant for flow in open channel is a factor used in the equation that estimates mean flow velocity in open channel conduits.ⓘ Chezy's Constant for Flow in Open Channel [C]			+10% -10%
✖Hydraulic mean depth for open channel is defined as the area of the flow section divided by the top water surface width.ⓘ Hydraulic Mean Depth for Open Channel [m]			+10% -10%

✖Manning’s coefficient for open channel flow represents the roughness or friction applied to the flow by the channel.ⓘ Manning's coefficient or constant [n]

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Formula

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Manning's coefficient or constant

Formula

`"n" = (1/"C")*"m"^(1/6)`

Example

`"0.01444"=(1/"60")*("0.423m")^(1/6)`

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Download Flow in Open Channels Formulas PDF

Manning's coefficient or constant Solution

STEP 0: Pre-Calculation Summary

Formula Used

Manning’s Coefficient for Open Channel Flow = (1/Chezy's Constant for Flow in Open Channel)*Hydraulic Mean Depth for Open Channel^(1/6)
n = (1/C)*m^(1/6)
This formula uses 3 Variables

Variables Used

Manning’s Coefficient for Open Channel Flow - Manning’s coefficient for open channel flow represents the roughness or friction applied to the flow by the channel.
Chezy's Constant for Flow in Open Channel - Chezy's constant for flow in open channel is a factor used in the equation that estimates mean flow velocity in open channel conduits.
Hydraulic Mean Depth for Open Channel - (Measured in Meter) - Hydraulic mean depth for open channel is defined as the area of the flow section divided by the top water surface width.

STEP 1: Convert Input(s) to Base Unit

Chezy's Constant for Flow in Open Channel: 60 --> No Conversion Required
Hydraulic Mean Depth for Open Channel: 0.423 Meter --> 0.423 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

n = (1/C)*m^(1/6) --> (1/60)*0.423^(1/6)

Evaluating ... ...

n = 0.0144401646165443

STEP 3: Convert Result to Output's Unit

0.0144401646165443 --> No Conversion Required

FINAL ANSWER

0.0144401646165443 ≈ 0.01444 <-- Manning’s Coefficient for Open Channel Flow

(Calculation completed in 00.010 seconds)

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Created by Maiarutselvan V

PSG College of Technology (PSGCT), Coimbatore

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< 19 Flow in Open Channels Calculators

Chezy's constant considering Kutter's formula

Go Chezy's Constant for Flow in Open Channel = (23+(0.00155/Slope of Bed of Open Channel)+(1/Manning’s Coefficient for Open Channel Flow))/(1+(23+(0.00155/Slope of Bed of Open Channel))*(Manning’s Coefficient for Open Channel Flow/sqrt(Hydraulic Mean Depth for Open Channel)))

Area of Flow for Circular Channel

Go Area of Flow of Circular Channel = (Radius of Circular Open Channel^2)*(Half Angle by Water Surface in Circular Channel-((sin(2*Half Angle by Water Surface in Circular Channel))/2))

Chezy's constant considering velocity

Go Chezy's Constant for Flow in Open Channel = Flow Velocity in Open Channel/(sqrt(Hydraulic Mean Depth for Open Channel*Slope of Bed of Open Channel))

Velocity of Chezy's formula

Go Flow Velocity in Open Channel = Chezy's Constant for Flow in Open Channel*sqrt(Hydraulic Mean Depth for Open Channel*Slope of Bed of Open Channel)

Hydraulic mean depth using Chezy's formula

Go Hydraulic Mean Depth for Open Channel = (1/Slope of Bed of Open Channel)*(Flow Velocity in Open Channel/Chezy's Constant for Flow in Open Channel)^2

Bazin's constant

Go Bazin's Constant for Flow in Open Channel = (sqrt(Hydraulic Mean Depth for Open Channel))*((157.6/Chezy's Constant for Flow in Open Channel)-1.81)

Chezy's constant considering Bazin formula

Go Chezy's Constant for Flow in Open Channel = 157.6/(1.81+(Bazin's Constant for Flow in Open Channel/sqrt(Hydraulic Mean Depth for Open Channel)))

Hydraulic mean depth considering Bazin formula

Go Hydraulic Mean Depth for Open Channel = (Bazin's Constant for Flow in Open Channel/(((157.6/Chezy's Constant for Flow in Open Channel)-1.81)))^2

Chezy's constant considering Manning's formula

Go Chezy's Constant for Flow in Open Channel = (1/Manning’s Coefficient for Open Channel Flow)*(Hydraulic Mean Depth for Open Channel^(1/6))

Manning's coefficient or constant

Go Manning’s Coefficient for Open Channel Flow = (1/Chezy's Constant for Flow in Open Channel)*Hydraulic Mean Depth for Open Channel^(1/6)

Hydraulic mean depth considering Manning's formula

Go Hydraulic Mean Depth for Open Channel = (Chezy's Constant for Flow in Open Channel*Manning’s Coefficient for Open Channel Flow)^6

Discharge per unit width considering flow in open channels

Go Discharge Per Unit Width in Open Channel = sqrt((Critical Depth for Flow in Open Channel^3)*[g])

Radius of Circular Channel using Wetted Perimeter

Go Radius of Circular Open Channel = Wetted Perimeter of Circular Open Channel/(2*Half Angle by Water Surface in Circular Channel)

Critical velocity considering flow in open channels

Go Critical Velocity for Flow in Open Channel = sqrt([g]*Critical Depth for Flow in Open Channel)

Wetted Perimeter for Circular Channel

Go Wetted Perimeter of Circular Open Channel = 2*Radius of Circular Open Channel*Half Angle by Water Surface in Circular Channel

Critical depth considering flow in open channels

Go Critical Depth for Flow in Open Channel = ((Discharge Per Unit Width in Open Channel^2)/[g])^(1/3)

Critical Depth using Critical Velocity

Go Critical Depth for Flow in Open Channel = (Critical Velocity for Flow in Open Channel^2)/[g]

Critical depth considering minimum specific energy

Go Critical Depth for Flow in Open Channel = (2/3)*Minimum Specific Energy for Open Channel Flow

Minimum Specific Energy using Critical Depth

Go Minimum Specific Energy for Open Channel Flow = (3/2)*Critical Depth for Flow in Open Channel

Manning's coefficient or constant Formula

Manning’s Coefficient for Open Channel Flow = (1/Chezy's Constant for Flow in Open Channel)*Hydraulic Mean Depth for Open Channel^(1/6)
n = (1/C)*m^(1/6)

What is a Manning's constant?

Manning's n value is a unitless coefficient that represents the roughness or friction factor of the conduit. Rougher conduits with higher friction have a higher value, and smoother conduits with lower friction have a lower value.

What is Bazin's constant?

The basin's constant is dependent on the roughness of the channel surface. More the roughness of the surface, the higher is the value of Bazin's Constant.

How to Calculate Manning's coefficient or constant?

Manning's coefficient or constant calculator uses Manning’s Coefficient for Open Channel Flow = (1/Chezy's Constant for Flow in Open Channel)*Hydraulic Mean Depth for Open Channel^(1/6) to calculate the Manning’s Coefficient for Open Channel Flow, The Manning's coefficient or constant is known while considering Chezy's constant or coefficient, and the hydraulic mean depth using Manning's formula. Manning’s Coefficient for Open Channel Flow is denoted by n symbol.

How to calculate Manning's coefficient or constant using this online calculator? To use this online calculator for Manning's coefficient or constant, enter Chezy's Constant for Flow in Open Channel (C) & Hydraulic Mean Depth for Open Channel (m) and hit the calculate button. Here is how the Manning's coefficient or constant calculation can be explained with given input values -> 0.01444 = (1/60)*0.423^(1/6).

FAQ

What is Manning's coefficient or constant?

The Manning's coefficient or constant is known while considering Chezy's constant or coefficient, and the hydraulic mean depth using Manning's formula and is represented as n = (1/C)*m^(1/6) or Manning’s Coefficient for Open Channel Flow = (1/Chezy's Constant for Flow in Open Channel)*Hydraulic Mean Depth for Open Channel^(1/6). Chezy's constant for flow in open channel is a factor used in the equation that estimates mean flow velocity in open channel conduits & Hydraulic mean depth for open channel is defined as the area of the flow section divided by the top water surface width.

How to calculate Manning's coefficient or constant?

The Manning's coefficient or constant is known while considering Chezy's constant or coefficient, and the hydraulic mean depth using Manning's formula is calculated using Manning’s Coefficient for Open Channel Flow = (1/Chezy's Constant for Flow in Open Channel)*Hydraulic Mean Depth for Open Channel^(1/6). To calculate Manning's coefficient or constant, you need Chezy's Constant for Flow in Open Channel (C) & Hydraulic Mean Depth for Open Channel (m). With our tool, you need to enter the respective value for Chezy's Constant for Flow in Open Channel & Hydraulic Mean Depth for Open Channel and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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