Translations:Regenwassernutzung/200/en
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Runoff coefficients for different roof materials according to DIN 1989 Part 1:
| Roof material | Runoff coefficient |
|---|---|
| Pitched hard roof | 0.8 |
| Gravel / non-gravel flat roof | 0.6 / 0.8 |
| Intensive / extensive green roof | 0.3 / 0.5 |
