Runoff
Runoff, abbreviated as Q, is the water flow that occures on the ground surface when the soil is at full capacity from excess water from rainfall.
Runoff formula |
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\(\large{ Q = \frac { \left( p \;-\; I_a \right)^2 } { P \;-\; a_i \;+\; S } }\) | ||
Symbol | English | Metric |
\(\large{ Q }\) = runoff | \(\large{ft^3}\) | \(\large{m^3}\) |
\(\large{ I_a }\) = initial abstraction, the amount of water before runoff | \(\large{ft^3}\) | \(\large{m^3}\) |
\(\large{ S }\) = maximum soil moisture retention after runoff begins | \(\large{dimensionlessa}\) | |
\(\large{ P }\) = rainfall | \(\large{in}\) | \(\large{mm}\) |
Tags: Soil Equations