WMS:Runoff Coefficient Table

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A table of C values recommended by the American Society of Civil Engineers and Water Pollution Control Federation.

Area Description
Runoff Coefficient C
Business    
   Downtown 0.70-0.95
   Neighborhood 0.50-0.70
Residential    
   Single-Family 0.30-0.50
   Multiunits, detached 0.40-0.60
   Multiunits, attached 0.60-0.75
   Residential (suburban) 0.25-0.40
   Apartment 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 yard 0.20-0.35
   Unimproved 0.10-0.30
Character of surface
Runoff Coefficient C
Pavement    
   Asphaltic and concrete 0.70-0.95
   Brick 0.70-0.85
   Roofs 0.75-0.95
Lawns, sandy soil    
   Flat, 2 percent 0.05-0.10
   Average, 2-7 percent 0.10-0.15
   Steep, 7 percent 0.15-0.20
Lawns, heavy soil    
   Flat, 2 percent 0.13-0.17
   Average, 2-7 percent 0.18-0.22
   Steep, 7 percent 0.25-0.35

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