Runoff Coefficients (C)

Description of Area	Coefficient	Typical Design
BUSINESS
Downtown	0.70 - 0.95
Neighborhood	0.50 - 0.70

RESIDENTIAL
Single family	0.35 - 0.45
Multi-units detached	0.40 - 0.75
Suburban	0.25 - 0.40
Apartments	0.50 - 0.70

INDUSTRIAL
Light	0.50 - 0.80
Heavy	0.60 - 0.90

Parks, Cemeteries	0.10 - 0.25
Playgrounds	0.20 - 0.35
Railroad yards	0.20 - 0.40
Lawns, sandy soil	0.05 - 0.20
Lawns, heavy soil	0.18 - 0.35	0.30

Unimproved	0.10 - 0.30	0.30

Asphalt	0.70 - 0.95	0.90
Concrete	0.80 - 0.95	0.90
Roofs	0.75 - 0.95	0.90