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Engineering Hydrology
Direct Surface Runoff in SCS CN Method of Runoff Volume Formulas
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. And is denoted by Q. Direct Surface Runoff is usually measured using the Cubic Meter for Volume. Note that the value of Direct Surface Runoff is always positive.
Formulas to find Direct Surface Runoff in SCS CN Method of Runoff Volume
f
x
Direct Surface Runoff given Total Precipitation
Go
f
x
Daily Runoff for Black Soils Type I and Soil having AMC of Type I, II and III for Indian Conditions
Go
f
x
Daily Runoff in Smaller Catchments under SCS
Go
f
x
Daily Runoff valid for Black Soils under AMC of type I and II for Indian Conditions
Go
SCS CN Method of Runoff Volume formulas that make use of Direct Surface Runoff
f
x
Water Balance Equation for Rainfall
Go
f
x
Initial Abstraction
Go
f
x
Actual Infiltration
Go
f
x
Cumulative Infiltration given Total Precipitation
Go
f
x
Equation for Potential Maximum Retention
Go
f
x
Initial Abstraction given Ratio of Infiltration to Retention
Go
f
x
Precipitation given Potential Maximum Retention
Go
List of variables in SCS CN Method of Runoff Volume formulas
f
x
Total Precipitation
Go
f
x
Initial Abstraction
Go
f
x
Cumulative Infiltration
Go
f
x
Potential Maximum Retention
Go
FAQ
What is the 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. Direct Surface Runoff is usually measured using the Cubic Meter for Volume. Note that the value of Direct Surface Runoff is always positive.
Can the Direct Surface Runoff be negative?
No, the Direct Surface Runoff, measured in Volume cannot be negative.
What unit is used to measure Direct Surface Runoff?
Direct Surface Runoff 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 Direct Surface Runoff can be measured.
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