Additional Head given Head for Broad Crested Weir Calculator

✖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.ⓘ Head on Upstream of Weir [H_Upstream]			+10% -10%
✖Total Head is the combination of weir crested and additional head.ⓘ Total Head [H]			+10% -10%

✖Additional Head is the applied head due to the velocity of approach.ⓘ Additional Head given Head for Broad Crested Weir [h_a]

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Formula

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Additional Head given Head for Broad Crested Weir

Formula

`"h"_{"a"} = "H"_{"Upstream"}-"H"`

Example

`"5.1m"="10.1m"-"5m"`

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Additional Head given Head for Broad Crested Weir Solution

STEP 0: Pre-Calculation Summary

Formula Used

Additional Head = Head on Upstream of Weir-Total Head
h_a = H_Upstream-H
This formula uses 3 Variables

Variables Used

Additional Head - (Measured in Meter) - Additional Head is the applied head due to the velocity of approach.
Head on Upstream of Weir - (Measured in Meter) - 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.
Total Head - (Measured in Meter) - Total Head is the combination of weir crested and additional head.

STEP 1: Convert Input(s) to Base Unit

Head on Upstream of Weir: 10.1 Meter --> 10.1 Meter No Conversion Required
Total Head: 5 Meter --> 5 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

h_a = H_Upstream-H --> 10.1-5

Evaluating ... ...

h_a = 5.1

STEP 3: Convert Result to Output's Unit

5.1 Meter --> No Conversion Required

FINAL ANSWER

5.1 Meter <-- Additional Head

(Calculation completed in 00.004 seconds)

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Home » Engineering » Civil » Hydraulics and Waterworks » Flow Over Notches and Weirs » Broad Crested Weir » Additional Head given Head for Broad Crested Weir

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Created by M Naveen

National Institute of Technology (NIT), Warangal

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National Institute of Technology Karnataka (NITK), Surathkal

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< 20 Broad Crested Weir Calculators

Coefficient of Discharge given Actual Discharge over Broad Crested Weir

Go Coefficient of Discharge = Actual Discharge over Broad Crested Weir/(Length of Weir Crest*Critical Depth of Weir*sqrt((2*Acceleration due to Gravity)*(Total Head-Critical Depth of Weir)))

Length of Crest given Actual Discharge over Broad Crested Weir

Go Length of Weir Crest = Actual Discharge over Broad Crested Weir/(Coefficient of Discharge*Critical Depth of Weir*sqrt((2*Acceleration due to Gravity)*(Total Head-Critical Depth of Weir)))

Actual Discharge over Broad Crested Weir

Go Actual Discharge over Broad Crested Weir = Coefficient of Discharge*Length of Weir Crest*Critical Depth of Weir*sqrt((2*Acceleration due to Gravity)*(Total Head-Critical Depth of Weir))

Total Head for Actual Discharge over Broad Crested Weir

Go Total Head = (((Actual Discharge over Broad Crested Weir/(Coefficient of Discharge*Length of Weir Crest*Critical Depth of Weir))^2)*(1/(2*Acceleration due to Gravity)))+Critical Depth of Weir

Length of Crest given Discharge over Weir

Go Length of Weir Crest = Discharge Over Broad Crested Weir/(Critical Depth of Weir*sqrt((2*[g])*(Total Head-Critical Depth of Weir)))

Discharge over Broad Crested Weir

Go Discharge Over Broad Crested Weir = Length of Weir Crest*Critical Depth of Weir*sqrt((2*[g])*(Total Head-Critical Depth of Weir))

Total Head given Discharge over Weir Crest

Go Total Head = ((Discharge Over Broad Crested Weir/(Length of Weir Crest*Critical Depth of Weir))^2)*(1/(2*[g]))+Critical Depth of Weir

Velocity of Flow given Head

Go Velocity of Fluid for Weir = sqrt((2*Acceleration due to Gravity)*(Total Head-Critical Depth of Weir))

Head if Velocity is considered for Discharge over Broad Crested Weir

Go Total Head = (Max Discharge Over Broad Crested Weir/(1.70*Coefficient of Discharge*Length of Weir Crest))^(2/3)

Length of Crest over Broad Crested Weir for Max Discharge

Go Length of Weir Crest = Max Discharge Over Broad Crested Weir/(1.70*Coefficient of Discharge*(Total Head)^(3/2))

Total Head for Maximum Discharge

Go Total Head = (Max Discharge Over Broad Crested Weir/(1.70*Coefficient of Discharge*Length of Weir Crest))^(2/3)

Maximum Discharge of Broad Crested Weir if Critical Depth is Constant

Go Max Discharge Over Broad Crested Weir = 1.70*Coefficient of Discharge*Length of Weir Crest*(Total Head)^(3/2)

Coefficient of Discharge for Max Discharge over Crested Weir

Go Coefficient of Discharge = Max Discharge Over Broad Crested Weir/(1.70*Length of Weir Crest*(Total Head)^(3/2))

Max Discharge over Broad Crested Weir

Go Max Discharge Over Broad Crested Weir = 1.70*Coefficient of Discharge*Length of Weir Crest*(Total Head)^(3/2)

Length of Crest if Critical Depth is Constant for Discharge of Weir

Go Length of Weir Crest = Discharge Over Broad Crested Weir/(1.70*Coefficient of Discharge*(Total Head)^(3/2))

Coefficient of Discharge given Discharge of Weir if Critical Depth is Constant

Go Coefficient of Discharge = Discharge Over Broad Crested Weir/(1.70*Length of Weir Crest*(Total Head)^(3/2))

Critical Depth due to Reduction in Area of Flow Section given Total Head

Go Critical Depth of Weir = Total Head-(Velocity of Fluid for Weir^2/(2*Acceleration due to Gravity))

Total Head above Weir Crest

Go Total Head = Critical Depth of Weir+(Velocity of Fluid for Weir^2/(2*Acceleration due to Gravity))

Head for Broad Crested Weir

Go Head on Upstream of Weir = (Total Head+Additional Head)

Additional Head given Head for Broad Crested Weir

Go Additional Head = Head on Upstream of Weir-Total Head

Additional Head given Head for Broad Crested Weir Formula

Additional Head = Head on Upstream of Weir-Total Head
h_a = H_Upstream-H

What does Additional Head mean?

Additional head given head for broad crested weir is defined as measurement of additional height of water flowing in broad crested weir.

What is a Broad Crested Weir?

Broad crested weirs are robust structures that are generally constructed from reinforced concrete and which usually span the full width of the channel. They are used to measure the discharge of rivers, and are much more suited for this purpose than the relatively flimsy sharp crested weirs. The broad crested weir is one which the water flow discharge in measured from large water bodies like big canals while the sharp crested weir will help in measuring the discharge of the water from the small rivers and canals and the weir is placed in the direction of the flow of water.

How to Calculate Additional Head given Head for Broad Crested Weir?

Additional Head given Head for Broad Crested Weir calculator uses Additional Head = Head on Upstream of Weir-Total Head to calculate the Additional Head, Additional Head given Head for Broad Crested Weir is defined as measurement of additional height of water flowing in broad crested weir. Additional Head is denoted by h_a symbol.

How to calculate Additional Head given Head for Broad Crested Weir using this online calculator? To use this online calculator for Additional Head given Head for Broad Crested Weir, enter Head on Upstream of Weir (H_Upstream) & Total Head (H) and hit the calculate button. Here is how the Additional Head given Head for Broad Crested Weir calculation can be explained with given input values -> 5.1 = 10.1-5.

FAQ

What is Additional Head given Head for Broad Crested Weir?

Additional Head given Head for Broad Crested Weir is defined as measurement of additional height of water flowing in broad crested weir and is represented as h_a = H_Upstream-H or Additional Head = Head on Upstream of Weir-Total Head. 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 & Total Head is the combination of weir crested and additional head.

How to calculate Additional Head given Head for Broad Crested Weir?

Additional Head given Head for Broad Crested Weir is defined as measurement of additional height of water flowing in broad crested weir is calculated using Additional Head = Head on Upstream of Weir-Total Head. To calculate Additional Head given Head for Broad Crested Weir, you need Head on Upstream of Weir (H_Upstream) & Total Head (H). With our tool, you need to enter the respective value for Head on Upstream of Weir & Total Head 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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