Time of Peak or Time of Rise Calculator

✖Standard Duration of Effective Rainfall as adopted by Snyder.ⓘ Standard Duration of Effective Rainfall [t_r]			+10% -10%
✖Basin Lag is the elapsed time between the occurrences of the centroids of the effective rainfall.ⓘ Basin Lag [t_p]			+10% -10%

✖Time of Peak is the time interval from the start of rainfall to the peak discharge.ⓘ Time of Peak or Time of Rise [T_p]

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Formula

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Time of Peak or Time of Rise

Formula

`"T"_{"p"} = ("t"_{"r"}/2)+"t"_{"p"}`

Example

`"7h"=("2h"/2)+"6h"`

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Time of Peak or Time of Rise Solution

STEP 0: Pre-Calculation Summary

Formula Used

Time of Peak = (Standard Duration of Effective Rainfall/2)+Basin Lag
T_p = (t_r/2)+t_p
This formula uses 3 Variables

Variables Used

Time of Peak - (Measured in Second) - Time of Peak is the time interval from the start of rainfall to the peak discharge.
Standard Duration of Effective Rainfall - (Measured in Second) - Standard Duration of Effective Rainfall as adopted by Snyder.
Basin Lag - (Measured in Second) - Basin Lag is the elapsed time between the occurrences of the centroids of the effective rainfall.

STEP 1: Convert Input(s) to Base Unit

Standard Duration of Effective Rainfall: 2 Hour --> 7200 Second (Check conversion here)
Basin Lag: 6 Hour --> 21600 Second (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

T_p = (t_r/2)+t_p --> (7200/2)+21600

Evaluating ... ...

T_p = 25200

STEP 3: Convert Result to Output's Unit

25200 Second -->7 Hour (Check conversion here)

FINAL ANSWER

7 Hour <-- Time of Peak

(Calculation completed in 00.004 seconds)

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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

Time of Peak or Time of Rise Formula

Time of Peak = (Standard Duration of Effective Rainfall/2)+Basin Lag
T_p = (t_r/2)+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 Time of Peak or Time of Rise?

Time of Peak or Time of Rise calculator uses Time of Peak = (Standard Duration of Effective Rainfall/2)+Basin Lag to calculate the Time of Peak, The Time of Peak or Time of Rise formula is defined as the time interval from the start of rainfall to the peak discharge. Time of Peak is denoted by T_p symbol.

How to calculate Time of Peak or Time of Rise using this online calculator? To use this online calculator for Time of Peak or Time of Rise, enter Standard Duration of Effective Rainfall (t_r) & Basin Lag (t_p) and hit the calculate button. Here is how the Time of Peak or Time of Rise calculation can be explained with given input values -> 0.001818 = (7200/2)+21600.

FAQ

What is Time of Peak or Time of Rise?

The Time of Peak or Time of Rise formula is defined as the time interval from the start of rainfall to the peak discharge and is represented as T_p = (t_r/2)+t_p or Time of Peak = (Standard Duration of Effective Rainfall/2)+Basin Lag. Standard Duration of Effective Rainfall as adopted by Snyder & Basin Lag is the elapsed time between the occurrences of the centroids of the effective rainfall.

How to calculate Time of Peak or Time of Rise?

The Time of Peak or Time of Rise formula is defined as the time interval from the start of rainfall to the peak discharge is calculated using Time of Peak = (Standard Duration of Effective Rainfall/2)+Basin Lag. To calculate Time of Peak or Time of Rise, you need Standard Duration of Effective Rainfall (t_r) & Basin Lag (t_p). With our tool, you need to enter the respective value for Standard Duration of Effective Rainfall & Basin Lag and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Time of Peak?

In this formula, Time of Peak uses Standard Duration of Effective Rainfall & Basin Lag. We can use 4 other way(s) to calculate the same, which is/are as follows -

Time of Peak = Time of Recession/1.67
Time of Peak = 2.08*Area of Catchment/Peak Discharge
Time of Peak = 0.6*Time of Concentration+Standard Duration of Effective Rainfall/2
Time of Peak = Base Length/2.67

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