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Phi Index for Practical Use Formula

GoPhi Index given Total Runoff Depth Formula

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Φ-Index of a catchment is the constant infiltration capacity that would yield the actual total runoff for a given rainfall amount. Check FAQs

φ = \frac{I - R 24-h}{24}

φ - Φ-Index?I - Intensity of Rainfall?R_24-h - Runoff in Cm from 24h Rainfall?

Phi Index for Practical Use Example

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Here is how the Phi Index for Practical Use equation looks like with Values.

Here is how the Phi Index for Practical Use equation looks like with Units.

Here is how the Phi Index for Practical Use equation looks like.

0.0279 = \frac{0.8 - 0.13}{24}

0.0279 = \frac{0.8cm/h - 0.13cm}{24}

0.0279 = \frac{0.8 - 0.13}{24}

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Phi Index for Practical Use Solution

Follow our step by step solution on how to calculate Phi Index for Practical Use?

FIRST Step Consider the formula

φ = \frac{I - R 24-h}{24}

Next Step Substitute values of Variables

∴

φ = \frac{0.8cm/h - 0.13cm}{24}

Next Step Prepare to Evaluate

∴

φ = \frac{0.8 - 0.13}{24}

Next Step Evaluate

∴

φ = 0.0279166666666667

LAST Step Rounding Answer

∴

φ = 0.0279

Phi Index for Practical Use Formula Elements

Variables

Φ-Index

Φ-Index of a catchment is the constant infiltration capacity that would yield the actual total runoff for a given rainfall amount.

Symbol: φ

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Φ-Index

Intensity of Rainfall

Intensity of Rainfall is the ratio of the total amount of rain (rainfall depth) falling during a given period to the duration of the period.

Symbol: I

Measurement: SpeedUnit: cm/h

Note: Value should be greater than 0.

Formulas to find Intensity of Rainfall

Runoff in Cm from 24h Rainfall

Runoff in Cm from 24h Rainfall of intensity in centimeters per hour (cm/hr).

Symbol: R_24-h

Measurement: LengthUnit: cm

Note: Value should be greater than 0.

Formulas to find Runoff in Cm from 24h Rainfall

Other Formulas to find Φ-Index

Go Phi Index given Total Runoff Depth

φ = \frac{P - R d}{t e}

Other formulas in Φ Index category

Go Duration of Rainfall from Rainfall Hyetograph

D = N \cdot Δt

Go Time Interval of Rainfall Hyetograph

Δt = \frac{D}{N}

Go Pulses of Time Interval from Rainfall Hyetograph

N = \frac{D}{Δt}

Go Total Direct Runoff Depth

R d = P - (φ \cdot t e)

How to Evaluate Phi Index for Practical Use?

Phi Index for Practical Use evaluator uses Φ-Index = (Intensity of Rainfall-Runoff in Cm from 24h Rainfall)/24 to evaluate the Φ-Index, The Phi Index for Practical Use formula is defined as the constant infiltration capacity that would yield the actual total runoff for a given rainfall amount. Φ-Index is denoted by φ symbol.

How to evaluate Phi Index for Practical Use using this online evaluator? To use this online evaluator for Phi Index for Practical Use, enter Intensity of Rainfall (I) & Runoff in Cm from 24h Rainfall (R_24-h) and hit the calculate button.

FAQs on Phi Index for Practical Use

What is the formula to find Phi Index for Practical Use?

The formula of Phi Index for Practical Use is expressed as Φ-Index = (Intensity of Rainfall-Runoff in Cm from 24h Rainfall)/24. Here is an example- 0.027917 = (2.22222222222222E-06-0.0013)/24.

How to calculate Phi Index for Practical Use?

With Intensity of Rainfall (I) & Runoff in Cm from 24h Rainfall (R_24-h) we can find Phi Index for Practical Use using the formula - Φ-Index = (Intensity of Rainfall-Runoff in Cm from 24h Rainfall)/24.

What are the other ways to Calculate Φ-Index?

Here are the different ways to Calculate Φ-Index-

Φ-Index=(Total Storm Precipitation-Total Direct Runoff)/Duration of Rainfall Excess

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Phi Index for Practical Use Formula

​GoPhi Index given Total Runoff Depth Formula

Phi Index for Practical Use Example

Phi Index for Practical Use Solution

Phi Index for Practical Use Formula Elements

Other Formulas to find Φ-Index

Other formulas in Φ Index category

How to Evaluate Phi Index for Practical Use?

FAQs on Phi Index for Practical Use

Variable Name

GoPhi Index given Total Runoff Depth Formula