Measured Unsteady Flow Formula

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Measured Unsteady Flow at a certain velocity. Check FAQs
QM=Qn1+(1vWSo)dh/dt
QM - Measured Unsteady Flow?Qn - Normal Discharge?vW - Velocity of Flood Wave?So - Channel Slope?dh/dt - Rate of Change of Stage?

Measured Unsteady Flow Example

With values
With units
Only example

Here is how the Measured Unsteady Flow equation looks like with Values.

Here is how the Measured Unsteady Flow equation looks like with Units.

Here is how the Measured Unsteady Flow equation looks like.

14.4Edit=12Edit1+(150Edit0.1Edit)2.2Edit
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Measured Unsteady Flow Solution

Follow our step by step solution on how to calculate Measured Unsteady Flow?

FIRST Step Consider the formula
QM=Qn1+(1vWSo)dh/dt
Next Step Substitute values of Variables
QM=12m³/s1+(150m/s0.1)2.2
Next Step Prepare to Evaluate
QM=121+(1500.1)2.2
LAST Step Evaluate
QM=14.4m³/s

Measured Unsteady Flow Formula Elements

Variables
Functions
Measured Unsteady Flow
Measured Unsteady Flow at a certain velocity.
Symbol: QM
Measurement: Volumetric Flow RateUnit: m³/s
Note: Value should be greater than 0.
Normal Discharge
The normal discharge at a given stage under steady uniform flow.
Symbol: Qn
Measurement: Volumetric Flow RateUnit: m³/s
Note: Value should be greater than 0.
Velocity of Flood Wave
Velocity of Flood Wave in the channel.
Symbol: vW
Measurement: SpeedUnit: m/s
Note: Value should be greater than 0.
Channel Slope
Channel Slope is how far a channel drops over a horizontal distance.
Symbol: So
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.
Rate of Change of Stage
Rate of Change of Stage in the channel.
Symbol: dh/dt
Measurement: NAUnit: Unitless
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 in Stage Discharge Relationship category

​Go Actual Discharge from Backwater Effect on Rating Curve Normalized Curve
Qa=Q0(FFo)m
​Go Normalized Discharge of Backwater Effect on Rating Curve Normalized Curve
Q0=Qa(FoF)m
​Go Actual Fall at Stage given Actual Discharge
F=Fo(QaQ0)1m
​Go Normalized Value of Fall given Discharge
Fo=F(Q0Qa)1m

How to Evaluate Measured Unsteady Flow?

Measured Unsteady Flow evaluator uses Measured Unsteady Flow = Normal Discharge*sqrt(1+(1/(Velocity of Flood Wave*Channel Slope))*Rate of Change of Stage) to evaluate the Measured Unsteady Flow, The Measured Unsteady Flow formula is defined as that at the same stage, more discharge passes through the river during rising stages than in falling ones. Measured Unsteady Flow is denoted by QM symbol.

How to evaluate Measured Unsteady Flow using this online evaluator? To use this online evaluator for Measured Unsteady Flow, enter Normal Discharge (Qn), Velocity of Flood Wave (vW), Channel Slope (So) & Rate of Change of Stage (dh/dt) and hit the calculate button.

FAQs on Measured Unsteady Flow

What is the formula to find Measured Unsteady Flow?
The formula of Measured Unsteady Flow is expressed as Measured Unsteady Flow = Normal Discharge*sqrt(1+(1/(Velocity of Flood Wave*Channel Slope))*Rate of Change of Stage). Here is an example- 14.4 = 12*sqrt(1+(1/(50*0.1))*2.2).
How to calculate Measured Unsteady Flow?
With Normal Discharge (Qn), Velocity of Flood Wave (vW), Channel Slope (So) & Rate of Change of Stage (dh/dt) we can find Measured Unsteady Flow using the formula - Measured Unsteady Flow = Normal Discharge*sqrt(1+(1/(Velocity of Flood Wave*Channel Slope))*Rate of Change of Stage). This formula also uses Square Root Function function(s).
Can the Measured Unsteady Flow be negative?
No, the Measured Unsteady Flow, measured in Volumetric Flow Rate cannot be negative.
Which unit is used to measure Measured Unsteady Flow?
Measured Unsteady Flow is usually measured using the Cubic Meter per Second[m³/s] for Volumetric Flow Rate. Cubic Meter per Day[m³/s], Cubic Meter per Hour[m³/s], Cubic Meter per Minute[m³/s] are the few other units in which Measured Unsteady Flow can be measured.
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