Storm-Water Runoff Coefficients vs. Surface
Storm-water runoff coefficients for various surfaces
Typical storm-water runoff coefficients for various surfaces:
Surface | Runoff Coefficient |
---|---|
Gardens, lawns, parks | 0.05 - 0.25 |
Pavements, inferior block | 0.40 - 0.50 |
Pavements, stone or brick | 0.75 - 0.80 |
Pavements, asphalt | 0.85 - 0.90 |
Roads, gravel | 0.15 - 0.30 |
Roadways, macadamized | 0.25 - 0.60 |
Roofs | 0.70 - 0.95 |
Walks, gravel | 0.15 - 0.30 |