Initial Abstraction in SCS CN Method of Runoff Volume Formulas

Initial Abstraction is a parameter that accounts for all losses prior to runoff and consists mainly of interception, infiltration, evaporation, and surface depression storage. And is denoted by I_a. Initial Abstraction is usually measured using the Cubic Meter for Volume. Note that the value of Initial Abstraction is always negative.

Formulas to find Initial Abstraction in SCS CN Method of Runoff Volume

fxInitial AbstractionGo

fxInitial Abstraction given Ratio of Infiltration to RetentionGo

fxInitial Abstraction given Total PrecipitationGo

SCS CN Method of Runoff Volume formulas that make use of Initial Abstraction

fxWater Balance Equation for RainfallGo

fxActual InfiltrationGo

fxCumulative Infiltration given Total PrecipitationGo

fxEquation for Potential Maximum RetentionGo

fxDirect Surface Runoff given Total PrecipitationGo

fxMaximum Potential RunoffGo

fxPrecipitation given Maximum Potential RunoffGo

fxPrecipitation given Potential Maximum RetentionGo

List of variables in SCS CN Method of Runoff Volume formulas

fx Total Precipitation Go

fx Cumulative Infiltration Go

fx Direct Surface Runoff Go

fx Potential Maximum Retention Go

fx Maximum Potential Runoff Go

FAQ

What is the Initial Abstraction?

Initial Abstraction is a parameter that accounts for all losses prior to runoff and consists mainly of interception, infiltration, evaporation, and surface depression storage. Initial Abstraction is usually measured using the Cubic Meter for Volume. Note that the value of Initial Abstraction is always negative.

Can the Initial Abstraction be negative?

Yes, the Initial Abstraction, measured in Volume can be negative.

What unit is used to measure Initial Abstraction?

Initial Abstraction is usually measured using the Cubic Meter[m³] for Volume. Cubic Centimeter[m³], Cubic Millimeter[m³], Liter[m³] are the few other units in which Initial Abstraction can be measured.

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