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Runoff Coefficients (C)

Description of AreaCoefficientTypical Design
BUSINESS
Downtown
0.70 - 0.95
Neighborhood0.50 - 0.70
RESIDENTIAL
Single family0.35 - 0.45
Multi-units detached0.40 - 0.75
Suburban0.25 - 0.40
Apartments0.50 - 0.70
INDUSTRIAL
Light0.50 - 0.80
Heavy0.60 - 0.90
Parks, Cemeteries0.10 - 0.25
Playgrounds0.20 - 0.35
Railroad yards0.20 - 0.40
Lawns, sandy soil0.05 - 0.20
Lawns, heavy soil0.18 - 0.350.30
Unimproved0.10 - 0.300.30
Asphalt0.70 - 0.950.90
Concrete0.80 - 0.950.90
Roofs0.75 - 0.950.90

 

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