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Flow Velocity refers to the speed at which a fluid, such as a liquid or gas, moves through a particular area within a given time. Check FAQs
vf=(0.397n)(Dp23)(S12)
vf - Flow Velocity?n - Manning Coefficient?Dp - Diameter of Pipe?S - Hydraulic Gradient?

Velocity of Flow in Pipe by Manning Formula given Diameter Example

With values
With units
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Here is how the Velocity of Flow in Pipe by Manning Formula given Diameter equation looks like with Values.

Here is how the Velocity of Flow in Pipe by Manning Formula given Diameter equation looks like with Units.

Here is how the Velocity of Flow in Pipe by Manning Formula given Diameter equation looks like.

11.9736Edit=(0.3970.009Edit)(0.4Edit23)(0.25Edit12)
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Velocity of Flow in Pipe by Manning Formula given Diameter Solution

Follow our step by step solution on how to calculate Velocity of Flow in Pipe by Manning Formula given Diameter?

FIRST Step Consider the formula
vf=(0.397n)(Dp23)(S12)
Next Step Substitute values of Variables
vf=(0.3970.009)(0.4m23)(0.2512)
Next Step Prepare to Evaluate
vf=(0.3970.009)(0.423)(0.2512)
Next Step Evaluate
vf=11.9735977087575m/s
LAST Step Rounding Answer
vf=11.9736m/s

Velocity of Flow in Pipe by Manning Formula given Diameter Formula Elements

Variables
Flow Velocity
Flow Velocity refers to the speed at which a fluid, such as a liquid or gas, moves through a particular area within a given time.
Symbol: vf
Measurement: SpeedUnit: m/s
Note: Value should be greater than 0.
Manning Coefficient
Manning Coefficient is dimensionless and varies depending on the type of channel or surface through which water flows.
Symbol: n
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.
Diameter of Pipe
Diameter of Pipe is the diameter of the pipe in which the liquid is flowing.
Symbol: Dp
Measurement: LengthUnit: m
Note: Value should be greater than 0.
Hydraulic Gradient
Hydraulic Gradient is a specific measurement of liquid pressure above a vertical datum.
Symbol: S
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.

Other Formulas to find Flow Velocity

​Go Velocity of Flow in Pipe by Manning Formula
vf=(1n)(Rh23)(S12)
​Go Velocity of Flow in Pipe given Head loss by Manning Formula
vf=hf0.157Dp43Lpn2
​Go Velocity of Flow in Pipe by Manning Formula given Radius of Pipe
vf=hf0.157(2R)43Lp'n2

Other formulas in Manning's Formula category

​Go Radius of Pipe given Velocity of Flow in Pipe by Manning Formula
Rh=(vfnS12)32
​Go Hydraulic Gradient given Velocity of Flow in Pipe by Manning Formula
S=(vfnRh23)2
​Go Manning's Coefficient given Velocity of Flow
n=(Rh23)(S12)vf
​Go Hydraulic Gradient by Manning Formula given Diameter
S=(vfn0.397(Dp23))2

How to Evaluate Velocity of Flow in Pipe by Manning Formula given Diameter?

Velocity of Flow in Pipe by Manning Formula given Diameter evaluator uses Flow Velocity = (0.397/Manning Coefficient)*(Diameter of Pipe^(2/3))*(Hydraulic Gradient^(1/2)) to evaluate the Flow Velocity, The Velocity of Flow in Pipe by Manning Formula given Diameter is defined as the value of velocity of flow when we have prior information of diameter of pipe andother parameters used. Flow Velocity is denoted by vf symbol.

How to evaluate Velocity of Flow in Pipe by Manning Formula given Diameter using this online evaluator? To use this online evaluator for Velocity of Flow in Pipe by Manning Formula given Diameter, enter Manning Coefficient (n), Diameter of Pipe (Dp) & Hydraulic Gradient (S) and hit the calculate button.

FAQs on Velocity of Flow in Pipe by Manning Formula given Diameter

What is the formula to find Velocity of Flow in Pipe by Manning Formula given Diameter?
The formula of Velocity of Flow in Pipe by Manning Formula given Diameter is expressed as Flow Velocity = (0.397/Manning Coefficient)*(Diameter of Pipe^(2/3))*(Hydraulic Gradient^(1/2)). Here is an example- 11.9736 = (0.397/0.009)*(0.4^(2/3))*(0.25^(1/2)).
How to calculate Velocity of Flow in Pipe by Manning Formula given Diameter?
With Manning Coefficient (n), Diameter of Pipe (Dp) & Hydraulic Gradient (S) we can find Velocity of Flow in Pipe by Manning Formula given Diameter using the formula - Flow Velocity = (0.397/Manning Coefficient)*(Diameter of Pipe^(2/3))*(Hydraulic Gradient^(1/2)).
What are the other ways to Calculate Flow Velocity?
Here are the different ways to Calculate Flow Velocity-
  • Flow Velocity=(1/Manning Coefficient)*(Hydraulic Radius^(2/3))*(Hydraulic Gradient^(1/2))OpenImg
  • Flow Velocity=sqrt((Head Loss*0.157*Diameter of Pipe^(4/3))/(Length of Pipe*Manning Coefficient^2))OpenImg
  • Flow Velocity=sqrt((Head Loss*0.157*(2*Pipe Radius)^(4/3))/(Pipe Length*Manning Coefficient^2))OpenImg
Can the Velocity of Flow in Pipe by Manning Formula given Diameter be negative?
No, the Velocity of Flow in Pipe by Manning Formula given Diameter, measured in Speed cannot be negative.
Which unit is used to measure Velocity of Flow in Pipe by Manning Formula given Diameter?
Velocity of Flow in Pipe by Manning Formula given Diameter is usually measured using the Meter per Second[m/s] for Speed. Meter per Minute[m/s], Meter per Hour[m/s], Kilometer per Hour[m/s] are the few other units in which Velocity of Flow in Pipe by Manning Formula given Diameter can be measured.
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