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Curve Number Formula

GoCurve Number for Antecedent Moisture Condition One Formula

GoCurve Number for Antecedent Moisture Condition-III Formula

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Curve Number is based on the area's hydrologic soil group, land use , treatment and hydrologic condition. Check FAQs

CN = \frac{25400}{S CN + 254}

CN - Curve Number?S_CN - Potential Maximum Retention (Curve Number)?

Curve Number Example

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With units

Only example

Here is how the Curve Number equation looks like with Values.

Here is how the Curve Number equation looks like with Units.

Here is how the Curve Number equation looks like.

12.0038 = \frac{25400}{1862 + 254}

12.0038 = \frac{25400}{1862mm + 254}

12.0038 = \frac{25400}{1862 + 254}

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Curve Number Solution

Follow our step by step solution on how to calculate Curve Number?

FIRST Step Consider the formula

CN = \frac{25400}{S CN + 254}

Next Step Substitute values of Variables

∴

CN = \frac{25400}{1862mm + 254}

Next Step Prepare to Evaluate

∴

CN = \frac{25400}{1862 + 254}

Next Step Evaluate

∴

CN = 12.0037807183365

LAST Step Rounding Answer

∴

CN = 12.0038

Curve Number Formula Elements

Variables

Curve Number

Curve Number is based on the area's hydrologic soil group, land use , treatment and hydrologic condition.

Symbol: CN

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Curve Number

Potential Maximum Retention (Curve Number)

Potential Maximum Retention (Curve Number) depends upon the soil vegetation land use complex of the catchment and also upon the antecedent soil moisture condition.

Symbol: S_CN

Measurement: LengthUnit: mm

Note: Value should be greater than 0.

Formulas to find Potential Maximum Retention (Curve Number)

Other Formulas to find Curve Number

Go Curve Number for Antecedent Moisture Condition One

CN = \frac{CN 11}{2.281 - 0.01281 \cdot CN 11}

Go Curve Number for Antecedent Moisture Condition-III

CN = \frac{CN 11}{0.427 + 0.00573 \cdot CN 11}

Other formulas in Curve Number (CN) category

Go Potential Maximum Retention

S CN = (\frac{25400}{CN}) - 254

Go Potential Maximum Retention given Curve Number

S CN = 254 \cdot (\frac{100}{CN} - 1)

How to Evaluate Curve Number?

Curve Number evaluator uses Curve Number = 25400/(Potential Maximum Retention (Curve Number)+254) to evaluate the Curve Number, The Curve Number formula is defined as the ratio of the constant 25400 to the potential maximum retention expressed in millimeters. Curve Number is denoted by CN symbol.

How to evaluate Curve Number using this online evaluator? To use this online evaluator for Curve Number, enter Potential Maximum Retention (Curve Number) (S_CN) and hit the calculate button.

FAQs on Curve Number

What is the formula to find Curve Number?

The formula of Curve Number is expressed as Curve Number = 25400/(Potential Maximum Retention (Curve Number)+254). Here is an example- 12.00378 = 25400/(1.862+254).

How to calculate Curve Number?

With Potential Maximum Retention (Curve Number) (S_CN) we can find Curve Number using the formula - Curve Number = 25400/(Potential Maximum Retention (Curve Number)+254).

What are the other ways to Calculate Curve Number?

Here are the different ways to Calculate Curve Number-

Curve Number=Runoff Curve Number/(2.281-0.01281*Runoff Curve Number)
Curve Number=Runoff Curve Number/(0.427+0.00573*Runoff Curve Number)

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