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Head on Downstream of Weir pertains to the energy status of water in water flow systems and is useful for describing flow in hydraulic structures. Check FAQs
h2=(1Δt(23)Cd2gLw2AR+(1HUpstream))2
h2 - Head on Downstream of Weir?Δt - Time Interval?Cd - Coefficient of Discharge?g - Acceleration due to Gravity?Lw - Length of Weir Crest?AR - Cross-Sectional Area of Reservoir?HUpstream - Head on Upstream of Weir?

Head2 given Time Required to Lower Liquid Surface Example

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Here is how the Head2 given Time Required to Lower Liquid Surface equation looks like with Values.

Here is how the Head2 given Time Required to Lower Liquid Surface equation looks like with Units.

Here is how the Head2 given Time Required to Lower Liquid Surface equation looks like.

2.8188Edit=(11.25Edit(23)0.66Edit29.8Edit3Edit213Edit+(110.1Edit))2
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Head2 given Time Required to Lower Liquid Surface Solution

Follow our step by step solution on how to calculate Head2 given Time Required to Lower Liquid Surface?

FIRST Step Consider the formula
h2=(1Δt(23)Cd2gLw2AR+(1HUpstream))2
Next Step Substitute values of Variables
h2=(11.25s(23)0.6629.8m/s²3m213+(110.1m))2
Next Step Prepare to Evaluate
h2=(11.25(23)0.6629.83213+(110.1))2
Next Step Evaluate
h2=2.81883293558076m
LAST Step Rounding Answer
h2=2.8188m

Head2 given Time Required to Lower Liquid Surface Formula Elements

Variables
Functions
Head on Downstream of Weir
Head on Downstream of Weir pertains to the energy status of water in water flow systems and is useful for describing flow in hydraulic structures.
Symbol: h2
Measurement: LengthUnit: m
Note: Value can be positive or negative.
Time Interval
Time interval is the time duration between two events/entities of interest.
Symbol: Δt
Measurement: TimeUnit: s
Note: Value should be greater than 0.
Coefficient of Discharge
The Coefficient of Discharge is ratio of actual discharge to theoretical discharge.
Symbol: Cd
Measurement: NAUnit: Unitless
Note: Value should be between 0 to 1.2.
Acceleration due to Gravity
The Acceleration due to Gravity is acceleration gained by an object because of gravitational force.
Symbol: g
Measurement: AccelerationUnit: m/s²
Note: Value should be greater than 0.
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.
Cross-Sectional Area of Reservoir
Cross-Sectional Area of Reservoir is the area of a reservoir that is obtained when a three-dimensional reservoir shape is sliced perpendicular to some specified axis at a point.
Symbol: AR
Measurement: AreaUnit:
Note: Value should be greater than 0.
Head on Upstream of Weir
Head on Upstream of Weirr pertains to the energy status of water in water flow systems and is useful for describing flow in hydraulic structures.
Symbol: HUpstream
Measurement: LengthUnit: m
Note: Value can be positive or negative.
sqrt
A square root function is a function that takes a non-negative number as an input and returns the square root of the given input number.
Syntax: sqrt(Number)

Other Formulas to find Head on Downstream of Weir

​Go Head2 given Time Required to Lower Liquid Surface using Bazins Formula
h2=(1Δtm2g2AR+(1HUpstream))2
​Go Head2 given Time Required to Lower Liquid for Triangular Notch
h2=(1(Δt(815)Cd2gtan(θ2)(23)AR)+(1HUpstream32))23

Other formulas in Time Required to Empty a Reservoir with Rectangular Weir category

​Go Time Required to Lower Liquid Surface
Δt=(2AR(23)Cd2gLw)(1h2-1HUpstream)
​Go Coefficient of Discharge for Time Required to Lower Liquid Surface
Cd=(2AR(23)Δt2gLw)(1h2-1HUpstream)

How to Evaluate Head2 given Time Required to Lower Liquid Surface?

Head2 given Time Required to Lower Liquid Surface evaluator uses Head on Downstream of Weir = (1/((Time Interval*(2/3)*Coefficient of Discharge*sqrt(2*Acceleration due to Gravity)*Length of Weir Crest)/(2*Cross-Sectional Area of Reservoir)+(1/sqrt(Head on Upstream of Weir))))^2 to evaluate the Head on Downstream of Weir, Head2 given Time Required to Lower Liquid SurfaceIn fluid dynamics, head is concept that relates energy in incompressible fluid to height of equivalent static column. Head on Downstream of Weir is denoted by h2 symbol.

How to evaluate Head2 given Time Required to Lower Liquid Surface using this online evaluator? To use this online evaluator for Head2 given Time Required to Lower Liquid Surface, enter Time Interval (Δt), Coefficient of Discharge (Cd), Acceleration due to Gravity (g), Length of Weir Crest (Lw), Cross-Sectional Area of Reservoir (AR) & Head on Upstream of Weir (HUpstream) and hit the calculate button.

FAQs on Head2 given Time Required to Lower Liquid Surface

What is the formula to find Head2 given Time Required to Lower Liquid Surface?
The formula of Head2 given Time Required to Lower Liquid Surface is expressed as Head on Downstream of Weir = (1/((Time Interval*(2/3)*Coefficient of Discharge*sqrt(2*Acceleration due to Gravity)*Length of Weir Crest)/(2*Cross-Sectional Area of Reservoir)+(1/sqrt(Head on Upstream of Weir))))^2. Here is an example- 2.818833 = (1/((1.25*(2/3)*0.66*sqrt(2*9.8)*3)/(2*13)+(1/sqrt(10.1))))^2.
How to calculate Head2 given Time Required to Lower Liquid Surface?
With Time Interval (Δt), Coefficient of Discharge (Cd), Acceleration due to Gravity (g), Length of Weir Crest (Lw), Cross-Sectional Area of Reservoir (AR) & Head on Upstream of Weir (HUpstream) we can find Head2 given Time Required to Lower Liquid Surface using the formula - Head on Downstream of Weir = (1/((Time Interval*(2/3)*Coefficient of Discharge*sqrt(2*Acceleration due to Gravity)*Length of Weir Crest)/(2*Cross-Sectional Area of Reservoir)+(1/sqrt(Head on Upstream of Weir))))^2. This formula also uses Square Root Function function(s).
What are the other ways to Calculate Head on Downstream of Weir?
Here are the different ways to Calculate Head on Downstream of Weir-
  • Head on Downstream of Weir=(1/((Time Interval*Bazins Coefficient*sqrt(2*Acceleration due to Gravity))/(2*Cross-Sectional Area of Reservoir)+(1/sqrt(Head on Upstream of Weir))))^2OpenImg
  • Head on Downstream of Weir=(1/(((Time Interval*(8/15)*Coefficient of Discharge*sqrt(2*Acceleration due to Gravity)*tan(Theta/2))/((2/3)*Cross-Sectional Area of Reservoir))+(1/Head on Upstream of Weir^(3/2))))^(2/3)OpenImg
Can the Head2 given Time Required to Lower Liquid Surface be negative?
Yes, the Head2 given Time Required to Lower Liquid Surface, measured in Length can be negative.
Which unit is used to measure Head2 given Time Required to Lower Liquid Surface?
Head2 given Time Required to Lower Liquid Surface is usually measured using the Meter[m] for Length. Millimeter[m], Kilometer[m], Decimeter[m] are the few other units in which Head2 given Time Required to Lower Liquid Surface can be measured.
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