Storm-Water Runoff Coefficients vs. Surface
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 |
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