Rainwater Runoff
Calculate the rainwater runoff from a surface.
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Runoff volume = area × rainfall × runoff coefficient. Typical coefficients: roof 0.9, paved 0.85, gravel 0.6, lawn 0.2.
Runoff volume = area × rainfall × runoff coefficient. Typical coefficients: roof 0.9, paved 0.85, gravel 0.6, lawn 0.2.