Modified Basin Lag for Effective Duration Calculator

✖Basin Lag is the elapsed time between the occurrences of the centroids of the effective rainfall.ⓘ Basin Lag [t_p]			+10% -10%
✖Non-standard rainfall duration to derive modified basin lag.ⓘ Non-standard rainfall duration [t_R]			+10% -10%

✖Modified Basin Lag for an effective duration rainfall.ⓘ Modified Basin Lag for Effective Duration [t'_p]

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Formula

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Modified Basin Lag for Effective Duration

Formula

t' p = (21 \cdot \frac{t p}{22}) + (\frac{t R}{4})

Example

6.227273 h = (21 \cdot \frac{6 h}{22}) + (\frac{2 h}{4})

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Modified Basin Lag for Effective Duration Solution

STEP 0: Pre-Calculation Summary

Formula Used

Modified Basin Lag = (21*Basin Lag/22)+(Non-standard rainfall duration/4)
t'_p = (21*t_p/22)+(t_R/4)
This formula uses 3 Variables

Variables Used

Modified Basin Lag - (Measured in Second) - Modified Basin Lag for an effective duration rainfall.
Basin Lag - (Measured in Second) - Basin Lag is the elapsed time between the occurrences of the centroids of the effective rainfall.
Non-standard rainfall duration - (Measured in Second) - Non-standard rainfall duration to derive modified basin lag.

STEP 1: Convert Input(s) to Base Unit

Basin Lag: 6 Hour --> 21600 Second (Check conversion here)
Non-standard rainfall duration: 2 Hour --> 7200 Second (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

t'_p = (21*t_p/22)+(t_R/4) --> (21*21600/22)+(7200/4)

Evaluating ... ...

t'_p = 22418.1818181818

STEP 3: Convert Result to Output's Unit

22418.1818181818 Second -->6.22727272727273 Hour (Check conversion here)

FINAL ANSWER

6.22727272727273 ≈ 6.227273 Hour <-- Modified Basin Lag

(Calculation completed in 00.020 seconds)

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Created by Mithila Muthamma PA

Coorg Institute of Technology (CIT), Coorg

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< Synder's Synthetic Unit Hydrograph Calculators

Regional Constant given Peak Discharge for Nonstandard Effective Rainfall

Go Regional Constant (Snyder) = Peak Discharge*Modified Basin Lag/(2.78*Area of Catchment)

Peak Discharge for Nonstandard Effective Rainfall

Go Peak Discharge = 2.78*Regional Constant (Snyder)*Area of Catchment/Modified Basin Lag

Catchment Area given Peak Discharge for Nonstandard Effective Rainfall

Go Area of Catchment = Peak Discharge*Modified Basin Lag/(2.78*Regional Constant)

Modified Basin Lag given Peak Discharge for Nonstandard Effective Rainfall

Go Modified Basin Lag = 2.78*Regional Constant*Area of Catchment/Peak Discharge

Modified Basin Lag for Effective Duration Formula

Modified Basin Lag = (21*Basin Lag/22)+(Non-standard rainfall duration/4)
t'_p = (21*t_p/22)+(t_R/4)

What is Lag Time in hydrology?

The lag time is the delay between the maximum rainfall amount and the peak discharge. The shape of a hydrograph varies in each river basin and each storm event. This increases lag time. The peak discharge is also lower as it takes water longer to reach the river channel.

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 Modified Basin Lag for Effective Duration?

Modified Basin Lag for Effective Duration calculator uses Modified Basin Lag = (21*Basin Lag/22)+(Non-standard rainfall duration/4) to calculate the Modified Basin Lag, The Modified Basin Lag for Effective Duration formula is defined as the elapsed time between the occurrences of the centroids of the effective rainfall and of the storm runoff hydrograph and is an important factor in determining the time to peak of the unit. Modified Basin Lag is denoted by t'_p symbol.

How to calculate Modified Basin Lag for Effective Duration using this online calculator? To use this online calculator for Modified Basin Lag for Effective Duration, enter Basin Lag (t_p) & Non-standard rainfall duration (t_R) and hit the calculate button. Here is how the Modified Basin Lag for Effective Duration calculation can be explained with given input values -> 0.00173 = (21*21600/22)+(7200/4).

FAQ

What is Modified Basin Lag for Effective Duration?

The Modified Basin Lag for Effective Duration formula is defined as the elapsed time between the occurrences of the centroids of the effective rainfall and of the storm runoff hydrograph and is an important factor in determining the time to peak of the unit and is represented as t'_p = (21*t_p/22)+(t_R/4) or Modified Basin Lag = (21*Basin Lag/22)+(Non-standard rainfall duration/4). Basin Lag is the elapsed time between the occurrences of the centroids of the effective rainfall & Non-standard rainfall duration to derive modified basin lag.

How to calculate Modified Basin Lag for Effective Duration?

The Modified Basin Lag for Effective Duration formula is defined as the elapsed time between the occurrences of the centroids of the effective rainfall and of the storm runoff hydrograph and is an important factor in determining the time to peak of the unit is calculated using Modified Basin Lag = (21*Basin Lag/22)+(Non-standard rainfall duration/4). To calculate Modified Basin Lag for Effective Duration, you need Basin Lag (t_p) & Non-standard rainfall duration (t_R). With our tool, you need to enter the respective value for Basin Lag & Non-standard rainfall duration 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 Modified Basin Lag?

In this formula, Modified Basin Lag uses Basin Lag & Non-standard rainfall duration. We can use 3 other way(s) to calculate the same, which is/are as follows -

Modified Basin Lag = 2.78*Regional Constant*Area of Catchment/Peak Discharge
Modified Basin Lag = Basin Lag+(Non-standard rainfall duration-Standard Duration of Effective Rainfall)/4
Modified Basin Lag = (Time Base-72)/3

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