Translations:Versickerung und Retention/30/en
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| 1. DRAINMAX Tunnel | 6. Infiltration trough |
| 2. Tunnel side and top backfil | 7. Rainwater inlet |
| 3. Geotextile | 8. Distance to groundwater |
| 4. Tunnel overburden | 9. Active soil zone |
| 5. Topsoil | 10. Maximum water level |
