Head when End Contractions is suppressed Calculator

✖Francis Discharge with Suppressed End is discharge of flow without the end contraction.ⓘ Francis Discharge with Suppressed End [Q_Fr']			+10% -10%
✖Length of Weir Crest is the measurement or extent of Weir Crest from end to end.ⓘ Length of Weir Crest [L_w]			+10% -10%

✖Still Water Head is the head of water which is still over weir.ⓘ Head when End Contractions is suppressed [H_Stillwater]

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Formula

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Head when End Contractions is suppressed

Formula

`"H"_{"Stillwater"} = ("Q"_{"Fr'"}/(1.84*"L"_{"w"}))^(2/3)`

Example

`"2.952201m"=("28m³/s"/(1.84*"3m"))^(2/3)`

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Download Flow Over Rectangular Sharp-Crested Weir or Notch Formulas PDF

Head when End Contractions is suppressed Solution

STEP 0: Pre-Calculation Summary

Formula Used

Still Water Head = (Francis Discharge with Suppressed End/(1.84*Length of Weir Crest))^(2/3)
H_Stillwater = (Q_Fr'/(1.84*L_w))^(2/3)
This formula uses 3 Variables

Variables Used

Still Water Head - (Measured in Meter) - Still Water Head is the head of water which is still over weir.
Francis Discharge with Suppressed End - (Measured in Cubic Meter per Second) - Francis Discharge with Suppressed End is discharge of flow without the end contraction.
Length of Weir Crest - (Measured in Meter) - Length of Weir Crest is the measurement or extent of Weir Crest from end to end.

STEP 1: Convert Input(s) to Base Unit

Francis Discharge with Suppressed End: 28 Cubic Meter per Second --> 28 Cubic Meter per Second No Conversion Required
Length of Weir Crest: 3 Meter --> 3 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

H_Stillwater = (Q_Fr'/(1.84*L_w))^(2/3) --> (28/(1.84*3))^(2/3)

Evaluating ... ...

H_Stillwater = 2.95220131314881

STEP 3: Convert Result to Output's Unit

2.95220131314881 Meter --> No Conversion Required

FINAL ANSWER

2.95220131314881 ≈ 2.952201 Meter <-- Still Water Head

(Calculation completed in 00.004 seconds)

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Home » Engineering » Civil » Hydraulics and Waterworks » Flow Over Notches and Weirs » Flow Over Rectangular Sharp-Crested Weir or Notch » Hydraulic Head » Head when End Contractions is suppressed

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Created by M Naveen

National Institute of Technology (NIT), Warangal

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

Verified by Mithila Muthamma PA

Coorg Institute of Technology (CIT), Coorg

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< 8 Hydraulic Head Calculators

Head over Crest given Discharge Passing over Weir with Velocity

Go Height of Water above Crest of Weir = (((Francis Discharge with Suppressed End*3)/(2*Coefficient of Discharge*sqrt(2*Acceleration due to Gravity)*Length of Weir Crest))+Velocity Head^(3/2))^(2/3)-Velocity Head

Head over Crest for given Discharge without Velocity

Go Height of Water above Crest of Weir = ((Francis Discharge with Suppressed End*3)/(2*Coefficient of Discharge*sqrt(2*Acceleration due to Gravity)*Length of Weir Crest))^(2/3)

Head when Bazin Formula for Discharge if Velocity is not considered

Go Height of Water above Crest of Weir = (Bazins Discharge without Velocity/(Bazins Coefficient*sqrt(2*Acceleration due to Gravity)*Length of Weir Crest))^(2/3)

Head when Bazin Formula for Discharge if Velocity is considered

Go Still Water Head = (Bazins Discharge with Velocity/(Bazins Coefficient*sqrt(2*Acceleration due to Gravity)*Length of Weir Crest))^(2/3)

Head given Discharge through Notch which is to be Calibrated

Go Height of Water above Crest of Weir = (Francis Discharge with Suppressed End/Constant of Flow)^(1/Number of End Contraction)

Head when End Contractions is suppressed

Go Still Water Head = (Francis Discharge with Suppressed End/(1.84*Length of Weir Crest))^(2/3)

Head given Coefficient for Bazin Formula

Go Height of Water above Crest of Weir = 0.003/(Bazins Coefficient-0.405)

Head given Coefficient using Bazin Formula and Velocity

Go Still Water Head = 0.003/(Bazins Coefficient-0.405)

Head when End Contractions is suppressed Formula

Still Water Head = (Francis Discharge with Suppressed End/(1.84*Length of Weir Crest))^(2/3)
H_Stillwater = (Q_Fr'/(1.84*L_w))^(2/3)

What is meant by Head?

In hydraulics, Head is a measure of the potential of fluid at the measurement point. or total energy per unit weight above a datum.

How to Calculate Head when End Contractions is suppressed?

Head when End Contractions is suppressed calculator uses Still Water Head = (Francis Discharge with Suppressed End/(1.84*Length of Weir Crest))^(2/3) to calculate the Still Water Head, The Head when End Contractions is suppressed is a measure of the quantity of any fluid flow over unit time. The quantity may be either volume or mass. Still Water Head is denoted by H_Stillwater symbol.

How to calculate Head when End Contractions is suppressed using this online calculator? To use this online calculator for Head when End Contractions is suppressed, enter Francis Discharge with Suppressed End (Q_Fr') & Length of Weir Crest (L_w) and hit the calculate button. Here is how the Head when End Contractions is suppressed calculation can be explained with given input values -> 2.952201 = (28/(1.84*3))^(2/3).

FAQ

What is Head when End Contractions is suppressed?

The Head when End Contractions is suppressed is a measure of the quantity of any fluid flow over unit time. The quantity may be either volume or mass and is represented as H_Stillwater = (Q_Fr'/(1.84*L_w))^(2/3) or Still Water Head = (Francis Discharge with Suppressed End/(1.84*Length of Weir Crest))^(2/3). Francis Discharge with Suppressed End is discharge of flow without the end contraction & Length of Weir Crest is the measurement or extent of Weir Crest from end to end.

How to calculate Head when End Contractions is suppressed?

The Head when End Contractions is suppressed is a measure of the quantity of any fluid flow over unit time. The quantity may be either volume or mass is calculated using Still Water Head = (Francis Discharge with Suppressed End/(1.84*Length of Weir Crest))^(2/3). To calculate Head when End Contractions is suppressed, you need Francis Discharge with Suppressed End (Q_Fr') & Length of Weir Crest (L_w). With our tool, you need to enter the respective value for Francis Discharge with Suppressed End & Length of Weir Crest and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Still Water Head?

In this formula, Still Water Head uses Francis Discharge with Suppressed End & Length of Weir Crest. We can use 2 other way(s) to calculate the same, which is/are as follows -

Still Water Head = (Bazins Discharge with Velocity/(Bazins Coefficient*sqrt(2*Acceleration due to Gravity)*Length of Weir Crest))^(2/3)
Still Water Head = 0.003/(Bazins Coefficient-0.405)

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