| Area Description |
Runoff Coefficient K |
| 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 K |
| 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 |
|
