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Stormwater Flow Formula

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Peak Rate of Runoff is the maximum rate of discharge during the period of runoff caused by a storm. Check FAQs

q p = C r \cdot I \cdot A

q_p - Peak Rate of Runoff?C_r - Runoff Coefficient?I - Average Rainfall Rate?A - Drainage Area?

Stormwater Flow Example

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With units

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Here is how the Stormwater Flow equation looks like with Values.

Here is how the Stormwater Flow equation looks like with Units.

Here is how the Stormwater Flow equation looks like.

1.25 = 0.5 \cdot 0.05 \cdot 50

1.25m³/s = 0.5 \cdot 0.05m/s \cdot 50m²

1.25 = 0.5 \cdot 0.05 \cdot 50

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Stormwater Flow Solution

Follow our step by step solution on how to calculate Stormwater Flow?

FIRST Step Consider the formula

q p = C r \cdot I \cdot A

Next Step Substitute values of Variables

∴

q p = 0.5 \cdot 0.05m/s \cdot 50m²

Next Step Prepare to Evaluate

∴

q p = 0.5 \cdot 0.05 \cdot 50

LAST Step Evaluate

∴

q p = 1.25m³/s

Stormwater Flow Formula Elements

Variables

Peak Rate of Runoff

Peak Rate of Runoff is the maximum rate of discharge during the period of runoff caused by a storm.

Symbol: q_p

Measurement: Volumetric Flow RateUnit: m³/s

Note: Value should be greater than 0.

Formulas to find Peak Rate of Runoff

Runoff Coefficient

Runoff Coefficient is a dimensionless coefficient relating the amount of runoff to the amount of precipitation received.

Symbol: C_r

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Runoff Coefficient

Average Rainfall Rate

Average Rainfall Rate is a measure of the intensity of rainfall by calculating the amount of rain that would fall over a given interval of time.

Symbol: I

Measurement: SpeedUnit: m/s

Note: Value should be greater than 0.

Formulas to find Average Rainfall Rate

Drainage Area

Drainage Area is the land region from which all precipitation flows to a common outlet, such as a river, lake, or ocean.

Symbol: A

Measurement: AreaUnit: m²

Note: Value should be greater than 0.

Formulas to find Drainage Area

Other formulas in Determining Storm Water Flow category

Go Average Rainfall Rate given Storm Water

I = \frac{q p}{C r \cdot A}

Go Coefficient of Runoff given Stormwater

C r = \frac{q p}{I \cdot A}

Go Drainage Area given Stormwater

A = \frac{q p}{C r \cdot I}

How to Evaluate Stormwater Flow?

Stormwater Flow evaluator uses Peak Rate of Runoff = Runoff Coefficient*Average Rainfall Rate*Drainage Area to evaluate the Peak Rate of Runoff, Stormwater flow is defined as the amount of storm water that has been collected due to excessive rainfall. Peak Rate of Runoff is denoted by q_p symbol.

How to evaluate Stormwater Flow using this online evaluator? To use this online evaluator for Stormwater Flow, enter Runoff Coefficient (C_r), Average Rainfall Rate (I) & Drainage Area (A) and hit the calculate button.

FAQs on Stormwater Flow

What is the formula to find Stormwater Flow?

The formula of Stormwater Flow is expressed as Peak Rate of Runoff = Runoff Coefficient*Average Rainfall Rate*Drainage Area. Here is an example- 1.25 = 0.5*0.05*50.

How to calculate Stormwater Flow?

With Runoff Coefficient (C_r), Average Rainfall Rate (I) & Drainage Area (A) we can find Stormwater Flow using the formula - Peak Rate of Runoff = Runoff Coefficient*Average Rainfall Rate*Drainage Area.

Can the Stormwater Flow be negative?

No, the Stormwater Flow, measured in Volumetric Flow Rate cannot be negative.

Which unit is used to measure Stormwater Flow?

Stormwater 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 Stormwater Flow can be measured.

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Stormwater Flow Formula

Stormwater Flow Example

Stormwater Flow Solution

Stormwater Flow Formula Elements

Other formulas in Determining Storm Water Flow category

How to Evaluate Stormwater Flow?

FAQs on Stormwater Flow

Variable Name