Direct Surface Runoff given Total Precipitation Calculator

✖Total Precipitation is the sum of rainfall and the assumed water equivalent of snowfall for a given year.ⓘ Total Precipitation [P_T]			+10% -10%
✖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 [I_a]			+10% -10%
✖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.ⓘ Cumulative Infiltration [F]			+10% -10%

✖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.ⓘ Direct Surface Runoff given Total Precipitation [Q]

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Formula

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Direct Surface Runoff given Total Precipitation

Formula

`"Q" = "P"_{"T"}-"I"_{"a"}-"F"`

Example

`"9m³"="16m³"-"5m³"-"2m³"`

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Download SCS-CN Method of Runoff Volume Formulas PDF

Direct Surface Runoff given Total Precipitation Solution

STEP 0: Pre-Calculation Summary

Formula Used

Direct Surface Runoff = Total Precipitation-Initial Abstraction-Cumulative Infiltration
Q = P_T-I_a-F
This formula uses 4 Variables

Variables Used

Direct Surface Runoff - (Measured in Cubic Meter) - 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.
Total Precipitation - (Measured in Cubic Meter) - Total Precipitation is the sum of rainfall and the assumed water equivalent of snowfall for a given year.
Initial Abstraction - (Measured in Cubic Meter) - Initial Abstraction is a parameter that accounts for all losses prior to runoff and consists mainly of interception, infiltration, evaporation, and surface depression storage.
Cumulative Infiltration - (Measured in Cubic Meter) - 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.

STEP 1: Convert Input(s) to Base Unit

Total Precipitation: 16 Cubic Meter --> 16 Cubic Meter No Conversion Required
Initial Abstraction: 5 Cubic Meter --> 5 Cubic Meter No Conversion Required
Cumulative Infiltration: 2 Cubic Meter --> 2 Cubic Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

Q = P_T-I_a-F --> 16-5-2

Evaluating ... ...

Q = 9

STEP 3: Convert Result to Output's Unit

9 Cubic Meter --> No Conversion Required

FINAL ANSWER

9 Cubic Meter <-- Direct Surface Runoff

(Calculation completed in 00.004 seconds)

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Coorg Institute of Technology (CIT), Coorg

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< 11 Basic Theory Calculators

Equation for Potential Maximum Retention

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

Actual Infiltration

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

Initial Abstraction given Ratio of Infiltration to Retention

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

Precipitation given Potential Maximum Retention

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

Cumulative Infiltration given Total Precipitation

Go Cumulative Infiltration = Total Precipitation-Initial Abstraction-Direct Surface Runoff

Direct Surface Runoff given Total Precipitation

Go Direct Surface Runoff = Total Precipitation-Initial Abstraction-Cumulative Infiltration

Water Balance Equation for Rainfall

Go Total Precipitation = Initial Abstraction+Cumulative Infiltration+Direct Surface Runoff

Initial Abstraction

Go Initial Abstraction = Total Precipitation-Cumulative Infiltration-Direct Surface Runoff

Initial Abstraction given Total Precipitation

Go Initial Abstraction = Total Precipitation-Maximum Potential Runoff

Precipitation given Maximum Potential Runoff

Go Total Precipitation = Maximum Potential Runoff+Initial Abstraction

Maximum Potential Runoff

Go Maximum Potential Runoff = Total Precipitation-Initial Abstraction

Direct Surface Runoff given Total Precipitation Formula

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

What is Water Balance Model?

Water Balance Model is a conceptual representation of the hydrologic cycle typically used to apply water balance principles at atmospheric, surface, soil water media, and subsurface scales.

What is 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.

How to Calculate Direct Surface Runoff given Total Precipitation?

Direct Surface Runoff given Total Precipitation calculator uses Direct Surface Runoff = Total Precipitation-Initial Abstraction-Cumulative Infiltration to calculate the Direct Surface Runoff, The Direct Surface Runoff given Total Precipitation formula is defined as the rain or meltwater that runs off during the rain or melt event as overland flow or in the vegetation cover above frozen soil. Direct Surface Runoff is denoted by Q symbol.

How to calculate Direct Surface Runoff given Total Precipitation using this online calculator? To use this online calculator for Direct Surface Runoff given Total Precipitation, enter Total Precipitation (P_T), Initial Abstraction (I_a) & Cumulative Infiltration (F) and hit the calculate button. Here is how the Direct Surface Runoff given Total Precipitation calculation can be explained with given input values -> 9 = 16-5-2.

FAQ

What is Direct Surface Runoff given Total Precipitation?

The Direct Surface Runoff given Total Precipitation formula is defined as the rain or meltwater that runs off during the rain or melt event as overland flow or in the vegetation cover above frozen soil and is represented as Q = P_T-I_a-F or Direct Surface Runoff = Total Precipitation-Initial Abstraction-Cumulative Infiltration. Total Precipitation is the sum of rainfall and the assumed water equivalent of snowfall for a given year, Initial Abstraction is a parameter that accounts for all losses prior to runoff and consists mainly of interception, infiltration, evaporation, and surface depression storage & 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.

How to calculate Direct Surface Runoff given Total Precipitation?

The Direct Surface Runoff given Total Precipitation formula is defined as the rain or meltwater that runs off during the rain or melt event as overland flow or in the vegetation cover above frozen soil is calculated using Direct Surface Runoff = Total Precipitation-Initial Abstraction-Cumulative Infiltration. To calculate Direct Surface Runoff given Total Precipitation, you need Total Precipitation (P_T), Initial Abstraction (I_a) & Cumulative Infiltration (F). With our tool, you need to enter the respective value for Total Precipitation, Initial Abstraction & Cumulative Infiltration and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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