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| subsurface drainage | |||
| internal drainage; sub-drainage | |||
| subsoil drainage; subsoil drainage The removal of surplus water from within the soil by natural or artificial means, such as by drains placed below the surface to lower the water table below the root zone | |||
| "rockfill tile drain"; rubble drain with pipe; stone-filled drain; subsurface drain with pipe | |||
| drenaggio sotterraneo: 4 phrases in 2 subjects |
| Life sciences | 3 |
| Water resources | 1 |