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Proportions of impervious surfaces in the area located in a 2.5, 5 and 10 km radius from each river monitoring station as well as in the drainage area of each station
| Site | Impervious surfaces proportion (%) | |||
|---|---|---|---|---|
| 2.5 km | 5 km | 10 km | Sub-watershed | |
| Dourdan | 8 | 3 | 2 | 3 |
| Egly | 19 | 13 | 11 | 4 |
| Yvette | 25 | 17 | 15 | 9 |
| Viry | 52 | 48 | 43 | 12 |
