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Length of Weir Crest is the measurement or extent of Weir Crest from end to end. Check FAQs
Lw=(QFr1.84(HStillwater32-HV32))+(0.1nHStillwater)
Lw - Length of Weir Crest?QFr - Francis Discharge?HStillwater - Still Water Head?HV - Velocity Head?n - Number of End Contraction?

Length of Crest when Francis Formula Discharge and Velocity is considered Example

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With units
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Here is how the Length of Crest when Francis Formula Discharge and Velocity is considered equation looks like with Values.

Here is how the Length of Crest when Francis Formula Discharge and Velocity is considered equation looks like with Units.

Here is how the Length of Crest when Francis Formula Discharge and Velocity is considered equation looks like.

3.2533Edit=(8Edit1.84(6.6Edit32-4.6Edit32))+(0.14Edit6.6Edit)
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Length of Crest when Francis Formula Discharge and Velocity is considered Solution

Follow our step by step solution on how to calculate Length of Crest when Francis Formula Discharge and Velocity is considered?

FIRST Step Consider the formula
Lw=(QFr1.84(HStillwater32-HV32))+(0.1nHStillwater)
Next Step Substitute values of Variables
Lw=(8m³/s1.84(6.6m32-4.6m32))+(0.146.6m)
Next Step Prepare to Evaluate
Lw=(81.84(6.632-4.632))+(0.146.6)
Next Step Evaluate
Lw=3.2532503492487m
LAST Step Rounding Answer
Lw=3.2533m

Length of Crest when Francis Formula Discharge and Velocity is considered Formula Elements

Variables
Length of Weir Crest
Length of Weir Crest is the measurement or extent of Weir Crest from end to end.
Symbol: Lw
Measurement: LengthUnit: m
Note: Value should be greater than 0.
Francis Discharge
Francis Discharge is calculated from the empirical formula given by Francis.
Symbol: QFr
Measurement: Volumetric Flow RateUnit: m³/s
Note: Value should be greater than 0.
Still Water Head
Still Water Head is the head of water which is still over weir.
Symbol: HStillwater
Measurement: LengthUnit: m
Note: Value can be positive or negative.
Velocity Head
Velocity Head is represented in the term of length unit, also referred to as kinetic head represents the kinetic energy of the fluid.
Symbol: HV
Measurement: LengthUnit: m
Note: Value should be greater than 0.
Number of End Contraction
Number of End Contraction 1 can be described as the end contractions acting on a channel.
Symbol: n
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.

Other Formulas to find Length of Weir Crest

​Go Length of Crest given Discharge Passing over Weir
Lw=QFr'32Cd2g((Sw+HV)32-HV32)
​Go Length of Crest without considering Velocity
Lw=(QFr23Cd2g)23+(0.1nSw)
​Go Length of Crest considering Velocity
Lw=(3QFr'2Cd2g(HStillwater32-HV32))+(0.1nHStillwater)
​Go Length of Crest when Francis Formula Discharge and Velocity is not considered
Lw=(QFr1.84Sw32)+(0.1nSw)

How to Evaluate Length of Crest when Francis Formula Discharge and Velocity is considered?

Length of Crest when Francis Formula Discharge and Velocity is considered evaluator uses Length of Weir Crest = (Francis Discharge/(1.84*(Still Water Head^(3/2)-Velocity Head^(3/2))))+(0.1*Number of End Contraction*Still Water Head) to evaluate the Length of Weir Crest, The Length of crest when Francis formula discharge and velocity is considered is given as it applies to the area of reclamation can be defined as ' The distance, measured along the axis. Length of Weir Crest is denoted by Lw symbol.

How to evaluate Length of Crest when Francis Formula Discharge and Velocity is considered using this online evaluator? To use this online evaluator for Length of Crest when Francis Formula Discharge and Velocity is considered, enter Francis Discharge (QFr), Still Water Head (HStillwater), Velocity Head (HV) & Number of End Contraction (n) and hit the calculate button.

FAQs on Length of Crest when Francis Formula Discharge and Velocity is considered

What is the formula to find Length of Crest when Francis Formula Discharge and Velocity is considered?
The formula of Length of Crest when Francis Formula Discharge and Velocity is considered is expressed as Length of Weir Crest = (Francis Discharge/(1.84*(Still Water Head^(3/2)-Velocity Head^(3/2))))+(0.1*Number of End Contraction*Still Water Head). Here is an example- 3.25325 = (8/(1.84*(6.6^(3/2)-4.6^(3/2))))+(0.1*4*6.6).
How to calculate Length of Crest when Francis Formula Discharge and Velocity is considered?
With Francis Discharge (QFr), Still Water Head (HStillwater), Velocity Head (HV) & Number of End Contraction (n) we can find Length of Crest when Francis Formula Discharge and Velocity is considered using the formula - Length of Weir Crest = (Francis Discharge/(1.84*(Still Water Head^(3/2)-Velocity Head^(3/2))))+(0.1*Number of End Contraction*Still Water Head).
What are the other ways to Calculate Length of Weir Crest?
Here are the different ways to Calculate Length of Weir Crest-
  • Length of Weir Crest=(Francis Discharge with Suppressed End*3)/(2*Coefficient of Discharge*sqrt(2*Acceleration due to Gravity)*((Height of Water above Crest of Weir+Velocity Head)^(3/2)-Velocity Head^(3/2)))OpenImg
  • Length of Weir Crest=((Francis Discharge*2)/(3*Coefficient of Discharge*sqrt(2*Acceleration due to Gravity)))^(2/3)+(0.1*Number of End Contraction*Height of Water above Crest of Weir)OpenImg
  • Length of Weir Crest=((3*Francis Discharge with Suppressed End)/(2*Coefficient of Discharge*sqrt(2*Acceleration due to Gravity)*(Still Water Head^(3/2)-Velocity Head^(3/2))))+(0.1*Number of End Contraction*Still Water Head)OpenImg
Can the Length of Crest when Francis Formula Discharge and Velocity is considered be negative?
No, the Length of Crest when Francis Formula Discharge and Velocity is considered, measured in Length cannot be negative.
Which unit is used to measure Length of Crest when Francis Formula Discharge and Velocity is considered?
Length of Crest when Francis Formula Discharge and Velocity is considered is usually measured using the Meter[m] for Length. Millimeter[m], Kilometer[m], Decimeter[m] are the few other units in which Length of Crest when Francis Formula Discharge and Velocity is considered can be measured.
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