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Approach Velocity Formula

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Velocity of Flow 1 is the flow of water over the channel. Check FAQs

v = \frac{Q'}{b \cdot d f}

v - Velocity of Flow 1?Q' - Discharge by Approach Velocity?b - Width of Channel1?d_f - Depth of Flow?

Approach Velocity Example

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Here is how the Approach Velocity equation looks like with Values.

Here is how the Approach Velocity equation looks like with Units.

Here is how the Approach Velocity equation looks like.

15.4494 = \frac{153}{3.001 \cdot 3.3}

15.4494m/s = \frac{153m³/s}{3.001m \cdot 3.3m}

15.4494 = \frac{153}{3.001 \cdot 3.3}

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Approach Velocity Solution

Follow our step by step solution on how to calculate Approach Velocity?

FIRST Step Consider the formula

v = \frac{Q'}{b \cdot d f}

Next Step Substitute values of Variables

∴

v = \frac{153m³/s}{3.001m \cdot 3.3m}

Next Step Prepare to Evaluate

∴

v = \frac{153}{3.001 \cdot 3.3}

Next Step Evaluate

∴

v = 15.4493956559935m/s

LAST Step Rounding Answer

∴

v = 15.4494m/s

Approach Velocity Formula Elements

Variables

Velocity of Flow 1

Velocity of Flow 1 is the flow of water over the channel.

Symbol: v

Measurement: SpeedUnit: m/s

Note: Value should be greater than 0.

Formulas to find Velocity of Flow 1

Discharge by Approach Velocity

Discharge by Approach Velocity is the volumetric flow rate (in m 3 /h or ft 3 /h) of water transported through a given cross-sectional area.

Symbol: Q'

Measurement: Volumetric Flow RateUnit: m³/s

Note: Value should be greater than 0.

Formulas to find Discharge by Approach Velocity

Width of Channel1

Width of Channel1 is the width of Notch and weir.

Symbol: b

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Width of Channel1

Depth of Flow

Depth of Flow is the distance from the top or surface of the flow to the bottom of a channel or other waterway or Depth of Flow at the Vertical while measuring Sound Weights.

Symbol: d_f

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Depth of Flow

Other formulas in Flow Over Rectangular Sharp Crested Weir or Notch category

Go Coefficient of Discharge given Discharge over Weir without considering Velocity

C d = \frac{Q Fr' \cdot 3}{2 \cdot (\sqrt{2 \cdot g}) \cdot L w \cdot {S w}^{\frac{3}{2}}}

Go Coefficient of Discharge given Discharge Passing over Weir considering Velocity

C d = \frac{Q Fr' \cdot 3}{2 \cdot (\sqrt{2 \cdot g}) \cdot L w \cdot ({(S w + H V)}^{\frac{3}{2}} - {H V}^{\frac{3}{2}})}

Go Coefficient of Discharge given Discharge if Velocity not considered

C d = \frac{Q Fr \cdot 3}{2 \cdot (\sqrt{2 \cdot g}) \cdot (L w - 0.1 \cdot n \cdot S w) \cdot {S w}^{\frac{3}{2}}}

Go Coefficient of Discharge given Discharge if Velocity considered

C d = \frac{Q Fr \cdot 3}{2 \cdot (\sqrt{2 \cdot g}) \cdot (L w - 0.1 \cdot n \cdot H Stillwater) \cdot ({H Stillwater}^{\frac{3}{2}} - {H V}^{\frac{3}{2}})}

How to Evaluate Approach Velocity?

Approach Velocity evaluator uses Velocity of Flow 1 = Discharge by Approach Velocity/(Width of Channel1*Depth of Flow) to evaluate the Velocity of Flow 1, Approach Velocity is defined as the rate of change of relative displacement between two bodies (i.e. how fast a body approaches another body ). Velocity of Flow 1 is denoted by v symbol.

How to evaluate Approach Velocity using this online evaluator? To use this online evaluator for Approach Velocity, enter Discharge by Approach Velocity (Q'), Width of Channel1 (b) & Depth of Flow (d_f) and hit the calculate button.

FAQs on Approach Velocity

What is the formula to find Approach Velocity?

The formula of Approach Velocity is expressed as Velocity of Flow 1 = Discharge by Approach Velocity/(Width of Channel1*Depth of Flow). Here is an example- 14.95601 = 153/(3.001*3.3).

How to calculate Approach Velocity?

With Discharge by Approach Velocity (Q'), Width of Channel1 (b) & Depth of Flow (d_f) we can find Approach Velocity using the formula - Velocity of Flow 1 = Discharge by Approach Velocity/(Width of Channel1*Depth of Flow).

Can the Approach Velocity be negative?

No, the Approach Velocity, measured in Speed cannot be negative.

Which unit is used to measure Approach Velocity?

Approach Velocity is usually measured using the Meter per Second[m/s] for Speed. Meter per Minute[m/s], Meter per Hour[m/s], Kilometer per Hour[m/s] are the few other units in which Approach Velocity can be measured.

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Approach Velocity Formula

Approach Velocity Example

Approach Velocity Solution

Approach Velocity Formula Elements

Other formulas in Flow Over Rectangular Sharp Crested Weir or Notch category

How to Evaluate Approach Velocity?

FAQs on Approach Velocity

Variable Name