Runoff Coefficient Table

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

Related Topics:
Rational Equation

Rational Method Overview

Basin Data