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Runoff coefficients for traditional roofing materials.
| Type | Runoff coefficient |
|---|---|
| Galvanized iron sheet | >0.9 |
| Corrugated metal sheet | 0.7–0.9 |
| Tiles | 0.8-0.9 |
| Concrete | 0.6–0.8 |
| Brick pavement | 0.5-0.6 |
| Rocky natural catchment | 0.2–0.5 |
| Soil with slope | 0.0–0.3 |
| Green area | 0.05–0.1 |
