Basin Lag for Mountainous Drainage Areas Calculator

✖Basin Length measured along the watercourse from the basin divide to the gauging station in km.ⓘ Basin Length [L_basin]			+10% -10%
✖Distance along Main Water Course from the gauging station to a point opposite to the watershed centroid in km.ⓘ Distance along Main Water Course [L_ca]			+10% -10%
✖Basin Slope of the catchment under consideration.ⓘ Basin Slope [S_B]			+10% -10%

✖Basin Lag is the elapsed time between the occurrences of the centroids of the effective rainfall.ⓘ Basin Lag for Mountainous Drainage Areas [t_p]

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Formula

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Basin Lag for Mountainous Drainage Areas

Formula

`"t"_{"p"} = 1.715*("L"_{"basin"}*"L"_{"ca"}/sqrt("S"_{"B"}))^0.38`

Example

`"10.14558h"=1.715*("9.4km"*"12.0km"/sqrt("1.1"))^0.38`

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Download Rational Method to Estimate the Flood Peak Formulas PDF

Basin Lag for Mountainous Drainage Areas Solution

STEP 0: Pre-Calculation Summary

Formula Used

Basin Lag = 1.715*(Basin Length*Distance along Main Water Course/sqrt(Basin Slope))^0.38
t_p = 1.715*(L_basin*L_ca/sqrt(S_B))^0.38
This formula uses 1 Functions, 4 Variables

Functions Used

sqrt - A square root function is a function that takes a non-negative number as an input and returns the square root of the given input number., sqrt(Number)

Variables Used

Basin Lag - (Measured in Hour) - Basin Lag is the elapsed time between the occurrences of the centroids of the effective rainfall.
Basin Length - (Measured in Kilometer) - Basin Length measured along the watercourse from the basin divide to the gauging station in km.
Distance along Main Water Course - (Measured in Kilometer) - Distance along Main Water Course from the gauging station to a point opposite to the watershed centroid in km.
Basin Slope - Basin Slope of the catchment under consideration.

STEP 1: Convert Input(s) to Base Unit

Basin Length: 9.4 Kilometer --> 9.4 Kilometer No Conversion Required
Distance along Main Water Course: 12 Kilometer --> 12 Kilometer No Conversion Required
Basin Slope: 1.1 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

t_p = 1.715*(L_basin*L_ca/sqrt(S_B))^0.38 --> 1.715*(9.4*12/sqrt(1.1))^0.38

Evaluating ... ...

t_p = 10.1455821573117

STEP 3: Convert Result to Output's Unit

36524.0957663222 Second -->10.1455821573117 Hour (Check conversion here)

FINAL ANSWER

10.1455821573117 ≈ 10.14558 Hour <-- Basin Lag

(Calculation completed in 00.004 seconds)

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< 3 US Practice Calculators

Basin Lag for Mountainous Drainage Areas

Go Basin Lag = 1.715*(Basin Length*Distance along Main Water Course/sqrt(Basin Slope))^0.38

Basin Lag for Foot Hill Drainage Area

Go Basin Lag = 1.03*(Basin Length*Distance along Main Water Course/sqrt(Basin Slope))^0.38

Basin Lag for Valley Drainage Areas

Go Basin Lag = 0.5*(Basin Length*Distance along Main Water Course/sqrt(Basin Slope))^0.38

Basin Lag for Mountainous Drainage Areas Formula

Basin Lag = 1.715*(Basin Length*Distance along Main Water Course/sqrt(Basin Slope))^0.38
t_p = 1.715*(L_basin*L_ca/sqrt(S_B))^0.38

What is a Catchment?

A Catchment Area is a hydrological unit. Each drop of precipitation that falls into a catchment area eventually ends up in the same river going to the sea if it doesn't evaporate.

How to Calculate Basin Lag for Mountainous Drainage Areas?

Basin Lag for Mountainous Drainage Areas calculator uses Basin Lag = 1.715*(Basin Length*Distance along Main Water Course/sqrt(Basin Slope))^0.38 to calculate the Basin Lag, The Basin Lag for Mountainous Drainage Areas is defined as the elapsed time between the occurrences of the centroids of the effective rainfall. Basin Lag is denoted by t_p symbol.

How to calculate Basin Lag for Mountainous Drainage Areas using this online calculator? To use this online calculator for Basin Lag for Mountainous Drainage Areas, enter Basin Length (L_basin), Distance along Main Water Course (L_ca) & Basin Slope (S_B) and hit the calculate button. Here is how the Basin Lag for Mountainous Drainage Areas calculation can be explained with given input values -> 0.002818 = 1.715*(9400*12000/sqrt(1.1))^0.38.

FAQ

What is Basin Lag for Mountainous Drainage Areas?

The Basin Lag for Mountainous Drainage Areas is defined as the elapsed time between the occurrences of the centroids of the effective rainfall and is represented as t_p = 1.715*(L_basin*L_ca/sqrt(S_B))^0.38 or Basin Lag = 1.715*(Basin Length*Distance along Main Water Course/sqrt(Basin Slope))^0.38. Basin Length measured along the watercourse from the basin divide to the gauging station in km, Distance along Main Water Course from the gauging station to a point opposite to the watershed centroid in km & Basin Slope of the catchment under consideration.

How to calculate Basin Lag for Mountainous Drainage Areas?

The Basin Lag for Mountainous Drainage Areas is defined as the elapsed time between the occurrences of the centroids of the effective rainfall is calculated using Basin Lag = 1.715*(Basin Length*Distance along Main Water Course/sqrt(Basin Slope))^0.38. To calculate Basin Lag for Mountainous Drainage Areas, you need Basin Length (L_basin), Distance along Main Water Course (L_ca) & Basin Slope (S_B). With our tool, you need to enter the respective value for Basin Length, Distance along Main Water Course & Basin Slope 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 Basin Lag?

In this formula, Basin Lag uses Basin Length, Distance along Main Water Course & Basin Slope. We can use 2 other way(s) to calculate the same, which is/are as follows -

Basin Lag = 1.03*(Basin Length*Distance along Main Water Course/sqrt(Basin Slope))^0.38
Basin Lag = 0.5*(Basin Length*Distance along Main Water Course/sqrt(Basin Slope))^0.38

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