Translations:Versickerung und Retention/32/en
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| 1. DRAINMAX Tunnel | 7. Sedimentation/filter chamber |
| 2. Tunnel side and top backfill | 8. Flushing chamber |
| 3. Geotextile | 9. Rainwater inlet |
| 4. Tunnel overburden | 10. Maximum water level |
| 5. Topsoil | 11. Geotextile composite bottom layer |
| 6. Rainwater distribution |
