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Initial Abstraction Formula

GoInitial Abstraction given Ratio of Infiltration to Retention Formula

GoInitial Abstraction given Total Precipitation Formula

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Initial Abstraction is a parameter that accounts for all losses prior to runoff and consists mainly of interception, infiltration, evaporation, and surface depression storage. Check FAQs

I a = P T - F - Q

I_a - Initial Abstraction?P_T - Total Precipitation?F - Cumulative Infiltration?Q - Direct Surface Runoff?

Initial Abstraction Example

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Here is how the Initial Abstraction equation looks like with Values.

Here is how the Initial Abstraction equation looks like with Units.

Here is how the Initial Abstraction equation looks like.

5 = 16 - 2 - 9

5m³ = 16m³ - 2m³ - 9m³

5 = 16 - 2 - 9

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Initial Abstraction Solution

Follow our step by step solution on how to calculate Initial Abstraction?

FIRST Step Consider the formula

I a = P T - F - Q

Next Step Substitute values of Variables

∴

I a = 16m³ - 2m³ - 9m³

Next Step Prepare to Evaluate

∴

I a = 16 - 2 - 9

LAST Step Evaluate

∴

I a = 5m³

Initial Abstraction Formula Elements

Variables

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.

Symbol: I_a

Measurement: VolumeUnit: m³

Note: Value can be positive or negative.

Formulas to find Initial Abstraction

Total Precipitation

Total Precipitation is the sum of rainfall and the assumed water equivalent of snowfall for a given year.

Symbol: P_T

Measurement: VolumeUnit: m³

Note: Value should be greater than 0.

Formulas to find Total Precipitation

Cumulative Infiltration

The cumulative infiltration excluding initial abstraction is total amount of water that soil strata are able to absorb from rainfall or irrigation in a given time.

Symbol: F

Measurement: VolumeUnit: m³

Note: Value should be greater than 0.

Formulas to find Cumulative Infiltration

Direct Surface Runoff

Direct Surface Runoff is the rain or meltwater that runs off during the rain or melt event as overland flow or in the vegetation cover above frozen soil.

Symbol: Q

Measurement: VolumeUnit: m³

Note: Value should be greater than 0.

Formulas to find Direct Surface Runoff

Other Formulas to find Initial Abstraction

Go Initial Abstraction given Ratio of Infiltration to Retention

I a = P T - (Q \cdot \frac{S}{F})

Go Initial Abstraction given Total Precipitation

I a = P T - R max

Other formulas in Basic Theory category

Go Water Balance Equation for Rainfall

P T = I a + F + Q

Go Actual Infiltration

F = S \cdot (\frac{Q}{P T - I a})

Go Cumulative Infiltration given Total Precipitation

F = P T - I a - Q

Go Equation for Potential Maximum Retention

S = F \cdot (\frac{P T - I a}{Q})

How to Evaluate Initial Abstraction?

Initial Abstraction evaluator uses Initial Abstraction = Total Precipitation-Cumulative Infiltration-Direct Surface Runoff to evaluate the Initial Abstraction, The Initial Abstraction formula is defined as the parameter that accounts for all losses prior to runoff and consists mainly of interception, infiltration, evaporation, and surface depression storage. Initial Abstraction is denoted by I_a symbol.

How to evaluate Initial Abstraction using this online evaluator? To use this online evaluator for Initial Abstraction, enter Total Precipitation (P_T), Cumulative Infiltration (F) & Direct Surface Runoff (Q) and hit the calculate button.

FAQs on Initial Abstraction

What is the formula to find Initial Abstraction?

The formula of Initial Abstraction is expressed as Initial Abstraction = Total Precipitation-Cumulative Infiltration-Direct Surface Runoff. Here is an example- 5 = 16-2-9.

How to calculate Initial Abstraction?

With Total Precipitation (P_T), Cumulative Infiltration (F) & Direct Surface Runoff (Q) we can find Initial Abstraction using the formula - Initial Abstraction = Total Precipitation-Cumulative Infiltration-Direct Surface Runoff.

What are the other ways to Calculate Initial Abstraction?

Here are the different ways to Calculate Initial Abstraction-

Initial Abstraction=Total Precipitation-(Direct Surface Runoff*Potential Maximum Retention/Cumulative Infiltration)
Initial Abstraction=Total Precipitation-Maximum Potential Runoff

Can the Initial Abstraction be negative?

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

Which 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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: Unit

Initial Abstraction Formula

​GoInitial Abstraction given Ratio of Infiltration to Retention Formula

​GoInitial Abstraction given Total Precipitation Formula

Initial Abstraction Example

Initial Abstraction Solution

Initial Abstraction Formula Elements

Other Formulas to find Initial Abstraction

Other formulas in Basic Theory category

How to Evaluate Initial Abstraction?

FAQs on Initial Abstraction

Variable Name

GoInitial Abstraction given Ratio of Infiltration to Retention Formula

GoInitial Abstraction given Total Precipitation Formula