Peak Discharge Calculator

✖Area of catchment is the area from which rain flows into a particular river or lake.ⓘ Area of Catchment [A]			+10% -10%
✖Time of Peak is the time interval from the start of rainfall to the peak discharge.ⓘ Time of Peak [T_p]			+10% -10%

✖Peak Discharge is the maximum volume flow rate passing a particular location during an event.ⓘ Peak Discharge [Q_p]

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Formula

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Peak Discharge

Formula

`"Q"_{"p"} = 2.08*"A"/"T"_{"p"}`

Example

`"0.891429m³/s"=2.08*"3.00km²"/"7h"`

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Download SCS Triangular Unit Hydrograph Formulas PDF

Peak Discharge Solution

STEP 0: Pre-Calculation Summary

Formula Used

Peak Discharge = 2.08*Area of Catchment/Time of Peak
Q_p = 2.08*A/T_p
This formula uses 3 Variables

Variables Used

Peak Discharge - (Measured in Cubic Meter per Second) - Peak Discharge is the maximum volume flow rate passing a particular location during an event.
Area of Catchment - (Measured in Square Kilometer) - Area of catchment is the area from which rain flows into a particular river or lake.
Time of Peak - (Measured in Hour) - Time of Peak is the time interval from the start of rainfall to the peak discharge.

STEP 1: Convert Input(s) to Base Unit

Area of Catchment: 3 Square Kilometer --> 3 Square Kilometer No Conversion Required
Time of Peak: 7 Hour --> 7 Hour No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

Q_p = 2.08*A/T_p --> 2.08*3/7

Evaluating ... ...

Q_p = 0.891428571428571

STEP 3: Convert Result to Output's Unit

0.891428571428571 Cubic Meter per Second --> No Conversion Required

FINAL ANSWER

0.891428571428571 ≈ 0.891429 Cubic Meter per Second <-- Peak Discharge

(Calculation completed in 00.004 seconds)

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Credits

Created by Mithila Muthamma PA

Coorg Institute of Technology (CIT), Coorg

Mithila Muthamma PA has created this Calculator and 2000+ more calculators!

Verified by Chandana P Dev

NSS College of Engineering (NSSCE), Palakkad

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< 13 SCS Triangular Unit Hydrograph Calculators

Time of Concentration given Time of Peak

Go Time of Concentration = (Time of Peak-(Standard Duration of Effective Rainfall/2))/0.6

Duration of Effective Rainfall for given Time of Peak

Go Standard Duration of Effective Rainfall = 2*(Time of Peak-0.6*Time of Concentration)

Time of Peak given Time of Concentration

Go Time of Peak = 0.6*Time of Concentration+Standard Duration of Effective Rainfall/2

Duration of Effective Rainfall given Time of Peak

Go Standard Duration of Effective Rainfall = 2*(Time of Peak-Basin Lag)

Time of Peak or Time of Rise

Go Time of Peak = (Standard Duration of Effective Rainfall/2)+Basin Lag

Lag Time given Time of Peak

Go Basin Lag = Time of Peak-Standard Duration of Effective Rainfall/2

Catchment Area given Peak Discharge

Go Area of Catchment = Time of Peak*Peak Discharge/2.08

Time of Peak given Peak Discharge

Go Time of Peak = 2.08*Area of Catchment/Peak Discharge

Peak Discharge

Go Peak Discharge = 2.08*Area of Catchment/Time of Peak

Time of Recession as Suggested in SCS

Go Time of Recession = 1.67*Time of Peak

Time of Peak given Time of Recession

Go Time of Peak = Time of Recession/1.67

Base Length in SCS Triangular Unit Hydrograph

Go Base Length = 2.67*Time of Peak

Time of Peak given Base Length

Go Time of Peak = Base Length/2.67

Peak Discharge Formula

Peak Discharge = 2.08*Area of Catchment/Time of Peak
Q_p = 2.08*A/T_p

What is Basin Lag?

Basin lag time, defined as the elapsed time between the occurrences of the centroids of the effective rainfall. and of the storm runoff hydrograph, is an important factor in determining the time to peak of the unit. hydrograph and the intensity of peak discharge.

What is Baseflow?

Baseflow is a portion of streamflow that is not directly generated from the excess rainfall during a storm event. In other words, this is the flow that would exist in the stream without the contribution of direct runoff from the rainfall.

How to Calculate Peak Discharge?

Peak Discharge calculator uses Peak Discharge = 2.08*Area of Catchment/Time of Peak to calculate 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 calculate Peak Discharge using this online calculator? To use this online calculator for Peak Discharge, enter Area of Catchment (A) & Time of Peak (T_p) and hit the calculate button. Here is how the Peak Discharge calculation can be explained with given input values -> 0.891429 = 2.08*3000000/25200.

FAQ

What is Peak Discharge?

The Peak Discharge formula is defined as the maximum volume flow rate passing a particular location during a storm event and is represented as Q_p = 2.08*A/T_p or Peak Discharge = 2.08*Area of Catchment/Time of Peak. Area of catchment is the area from which rain flows into a particular river or lake & Time of Peak is the time interval from the start of rainfall to the peak discharge.

How to calculate Peak Discharge?

The Peak Discharge formula is defined as the maximum volume flow rate passing a particular location during a storm event is calculated using Peak Discharge = 2.08*Area of Catchment/Time of Peak. To calculate Peak Discharge, you need Area of Catchment (A) & Time of Peak (T_p). With our tool, you need to enter the respective value for Area of Catchment & Time of Peak and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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