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Peak Discharge Formula

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Peak Discharge is the maximum volume flow rate passing a particular location during an event. Check FAQs

Q p = 2.08 \cdot \frac{A}{T p}

Q_p - Peak Discharge?A - Area of Catchment?T_p - Time of Peak?

Peak Discharge Example

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With units

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Here is how the Peak Discharge equation looks like with Values.

Here is how the Peak Discharge equation looks like with Units.

Here is how the Peak Discharge equation looks like.

0.8914 = 2.08 \cdot \frac{3}{7}

0.8914m³/s = 2.08 \cdot \frac{3km²}{7h}

0.8914 = 2.08 \cdot \frac{3}{7}

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Peak Discharge Solution

Follow our step by step solution on how to calculate Peak Discharge?

FIRST Step Consider the formula

Q p = 2.08 \cdot \frac{A}{T p}

Next Step Substitute values of Variables

∴

Q p = 2.08 \cdot \frac{3km²}{7h}

Next Step Prepare to Evaluate

∴

Q p = 2.08 \cdot \frac{3}{7}

Next Step Evaluate

∴

Q p = 0.891428571428571m³/s

LAST Step Rounding Answer

∴

Q p = 0.8914m³/s

Peak Discharge Formula Elements

Variables

Peak Discharge

Peak Discharge is the maximum volume flow rate passing a particular location during an event.

Symbol: Q_p

Measurement: Volumetric Flow RateUnit: m³/s

Note: Value can be positive or negative.

Formulas to find Peak Discharge

Area of Catchment

Area of Catchment is the geographical area from which water flows into a particular point, such as a well, stream, or reservoir.

Symbol: A

Measurement: AreaUnit: km²

Note: Value should be greater than 0.

Formulas to find Area of Catchment

Time of Peak

Time of Peak is the time interval from the start of rainfall to the peak discharge.

Symbol: T_p

Measurement: TimeUnit: h

Note: Value should be greater than 0.

Formulas to find Time of Peak

Other formulas in SCS Triangular Unit Hydrograph category

Go Time of Peak or Time of Rise

T p = (\frac{t r}{2}) + t p

Go Lag Time given Time of Peak

t p = T p - \frac{t r}{2}

Go Time of Recession as Suggested in SCS

Tc = 1.67 \cdot T p

Go Time of Peak given Time of Recession

T p = \frac{Tc}{1.67}

How to Evaluate Peak Discharge?

Peak Discharge evaluator uses Peak Discharge = 2.08*Area of Catchment/Time of Peak to evaluate the Peak Discharge, The Peak Discharge formula is defined as the maximum volume flow rate passing a particular location during a storm event. Peak Discharge is denoted by Q_p symbol.

How to evaluate Peak Discharge using this online evaluator? To use this online evaluator for Peak Discharge, enter Area of Catchment (A) & Time of Peak (T_p) and hit the calculate button.

FAQs on Peak Discharge

What is the formula to find Peak Discharge?

The formula of Peak Discharge is expressed as Peak Discharge = 2.08*Area of Catchment/Time of Peak. Here is an example- 0.891429 = 2.08*3000000/25200.

How to calculate Peak Discharge?

With Area of Catchment (A) & Time of Peak (T_p) we can find Peak Discharge using the formula - Peak Discharge = 2.08*Area of Catchment/Time of Peak.

Can the Peak Discharge be negative?

Yes, the Peak Discharge, measured in Volumetric Flow Rate can be negative.

Which unit is used to measure Peak Discharge?

Peak Discharge 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 Peak Discharge can be measured.

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