Curve Number for Antecedent Moisture Condition-III Calculator

✖Runoff Curve Number is an empirical parameter used in hydrology for predicting direct runoff or infiltration from rainfall excess under AMC-11.ⓘ Runoff Curve Number [CN₁₁]

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✖Curve Number is based on the area's hydrologic soil group, land use , treatment and hydrologic condition.ⓘ Curve Number for Antecedent Moisture Condition-III [CN]

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Formula

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Curve Number for Antecedent Moisture Condition-III

Formula

`"CN" = "CN"_{"11"}/(0.427+0.00573*"CN"_{"11"})`

Example

`"16.91904"="8"/(0.427+0.00573*"8")`

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Curve Number for Antecedent Moisture Condition-III Solution

STEP 0: Pre-Calculation Summary

Formula Used

Curve Number = Runoff Curve Number/(0.427+0.00573*Runoff Curve Number)
CN = CN₁₁/(0.427+0.00573*CN₁₁)
This formula uses 2 Variables

Variables Used

Curve Number - Curve Number is based on the area's hydrologic soil group, land use , treatment and hydrologic condition.
Runoff Curve Number - Runoff Curve Number is an empirical parameter used in hydrology for predicting direct runoff or infiltration from rainfall excess under AMC-11.

STEP 1: Convert Input(s) to Base Unit

Runoff Curve Number: 8 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

CN = CN₁₁/(0.427+0.00573*CN₁₁) --> 8/(0.427+0.00573*8)

Evaluating ... ...

CN = 16.9190423822012

STEP 3: Convert Result to Output's Unit

16.9190423822012 --> No Conversion Required

FINAL ANSWER

16.9190423822012 ≈ 16.91904 <-- Curve Number

(Calculation completed in 00.004 seconds)

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Home » Engineering » Civil » Engineering Hydrology » Runoff » Runoff Volume » SCS-CN Method of Runoff Volume » Curve Number (CN) » Curve Number for Antecedent Moisture Condition-III

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Created by Mithila Muthamma PA

Coorg Institute of Technology (CIT), Coorg

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< 5 Curve Number (CN) Calculators

Curve Number for Antecedent Moisture Condition One

Go Curve Number = Runoff Curve Number/(2.281-0.01281*Runoff Curve Number)

Curve Number for Antecedent Moisture Condition-III

Go Curve Number = Runoff Curve Number/(0.427+0.00573*Runoff Curve Number)

Potential Maximum Retention given Curve Number

Go Potential Maximum Retention (Curve Number) = 254*(100/Curve Number-1)

Potential Maximum Retention

Go Potential Maximum Retention (Curve Number) = (25400/Curve Number)-254

Curve Number

Go Curve Number = 25400/(Potential Maximum Retention (Curve Number)+254)

Curve Number for Antecedent Moisture Condition-III Formula

Curve Number = Runoff Curve Number/(0.427+0.00573*Runoff Curve Number)
CN = CN₁₁/(0.427+0.00573*CN₁₁)

What is CN in hydrology?

The Runoff Curve Number (also called a curve number or simply CN) is an empirical parameter used in hydrology for predicting direct runoff or infiltration from rainfall excess. High CN values (such as 98 for pavement) cause most of the rainfall to appear as runoff, with minimal losses.

What is Curve Number and on what factors it depends?

The Curve Number (CN) is a dimensionless parameter related to the potential maximum retention expressed in millimeters. It ranges from 0-100. A CN value of 100 represents a condition of zero potential retention and CN= 0 represents an infinitely abstracting catchment with S= ∞.
The Curve Number CN depends upon the following listed below
1. Soil Type
2. Land Use/Cover
3. Antecedent moisture condition

How to Calculate Curve Number for Antecedent Moisture Condition-III?

Curve Number for Antecedent Moisture Condition-III calculator uses Curve Number = Runoff Curve Number/(0.427+0.00573*Runoff Curve Number) to calculate the Curve Number, The Curve Number for Antecedent Moisture Condition-III formula is defined as the primary input parameter for the SCS runoff equation, for sufficient rainfall has occurred within the immediate past 5 days. Saturated soil conditions prevail. Curve Number is denoted by CN symbol.

How to calculate Curve Number for Antecedent Moisture Condition-III using this online calculator? To use this online calculator for Curve Number for Antecedent Moisture Condition-III, enter Runoff Curve Number (CN₁₁) and hit the calculate button. Here is how the Curve Number for Antecedent Moisture Condition-III calculation can be explained with given input values -> 16.91904 = 8/(0.427+0.00573*8).

FAQ

What is Curve Number for Antecedent Moisture Condition-III?

The Curve Number for Antecedent Moisture Condition-III formula is defined as the primary input parameter for the SCS runoff equation, for sufficient rainfall has occurred within the immediate past 5 days. Saturated soil conditions prevail and is represented as CN = CN₁₁/(0.427+0.00573*CN₁₁) or Curve Number = Runoff Curve Number/(0.427+0.00573*Runoff Curve Number). Runoff Curve Number is an empirical parameter used in hydrology for predicting direct runoff or infiltration from rainfall excess under AMC-11.

How to calculate Curve Number for Antecedent Moisture Condition-III?

The Curve Number for Antecedent Moisture Condition-III formula is defined as the primary input parameter for the SCS runoff equation, for sufficient rainfall has occurred within the immediate past 5 days. Saturated soil conditions prevail is calculated using Curve Number = Runoff Curve Number/(0.427+0.00573*Runoff Curve Number). To calculate Curve Number for Antecedent Moisture Condition-III, you need Runoff Curve Number (CN₁₁). With our tool, you need to enter the respective value for Runoff Curve Number 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 Curve Number?

In this formula, Curve Number uses Runoff Curve Number. We can use 2 other way(s) to calculate the same, which is/are as follows -

Curve Number = 25400/(Potential Maximum Retention (Curve Number)+254)
Curve Number = Runoff Curve Number/(2.281-0.01281*Runoff Curve Number)

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