Head for Broad Crested Weir Calculator

✖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 [h_a]			+10% -10%

✖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 for Broad Crested Weir [H_Upstream]

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Formula

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Head for Broad Crested Weir

Formula

`"H"_{"Upstream"} = ("H"+"h"_{"a"})`

Example

`"10.01m"=("5m"+"5.01m")`

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Download Broad Crested Weir Formulas PDF

Head for Broad Crested Weir Solution

STEP 0: Pre-Calculation Summary

Formula Used

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

Variables Used

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.
Additional Head - (Measured in Meter) - Additional Head is the applied head due to the velocity of approach.

STEP 1: Convert Input(s) to Base Unit

Total Head: 5 Meter --> 5 Meter No Conversion Required
Additional Head: 5.01 Meter --> 5.01 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

H_Upstream = (H+h_a) --> (5+5.01)

Evaluating ... ...

H_Upstream = 10.01

STEP 3: Convert Result to Output's Unit

10.01 Meter --> No Conversion Required

FINAL ANSWER

10.01 Meter <-- Head on Upstream of Weir

(Calculation completed in 00.006 seconds)

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

Credits

Created by M Naveen

National Institute of Technology (NIT), Warangal

M Naveen has created this Calculator and 500+ more calculators!

Verified by Rithik Agrawal

National Institute of Technology Karnataka (NITK), Surathkal

Rithik Agrawal has verified this Calculator and 400+ more calculators!

< 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)

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))

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)

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)

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))

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))

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

Head for Broad Crested Weir Formula

Head on Upstream of Weir = (Total Head+Additional Head)
H_Upstream = (H+h_a)

What does Head for Broad Crested Weir?

Head for Broad Crested Weir is defined as the combination of broad crested weir head and the additional head.

What does Additional Head mean?

In hydraulics additional head is defined as the measurement of additional height of water flowing in a broad crested weir.

How to Calculate Head for Broad Crested Weir?

Head for Broad Crested Weir calculator uses Head on Upstream of Weir = (Total Head+Additional Head) to calculate the Head on Upstream of Weir, Head for Broad Crested Weir is defined as the combination of broad crested weir head and the additional head. Head on Upstream of Weir is denoted by H_Upstream symbol.

How to calculate Head for Broad Crested Weir using this online calculator? To use this online calculator for Head for Broad Crested Weir, enter Total Head (H) & Additional Head (h_a) and hit the calculate button. Here is how the Head for Broad Crested Weir calculation can be explained with given input values -> 10.1 = (5+5.01).

FAQ

What is Head for Broad Crested Weir?

Head for Broad Crested Weir is defined as the combination of broad crested weir head and the additional head and is represented as H_Upstream = (H+h_a) or Head on Upstream of Weir = (Total Head+Additional Head). Total Head is the combination of weir crested and additional head & Additional Head is the applied head due to the velocity of approach.

How to calculate Head for Broad Crested Weir?

Head for Broad Crested Weir is defined as the combination of broad crested weir head and the additional head is calculated using Head on Upstream of Weir = (Total Head+Additional Head). To calculate Head for Broad Crested Weir, you need Total Head (H) & Additional Head (h_a). With our tool, you need to enter the respective value for Total Head & Additional 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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