n.drain that conveys liquid waste from toilets, etc.

Soil pipe
Soil pipe
Soil pipe
Controls of soil pipe frequency in upland blanket peat
Elastoplastic Solution for Soil-Pipe-Tunnel Interaction
Shaking table test of soil-pipe with joint dynamic interaction under non-uniform earthquake wave excitation
Soil pipe and slope stability
Soil pipe contribution to steady subsurface stormflow
Soil pipe distribution and hydrological functioning within the humid tropics: a synthesis
Soil pipe coupling
Ephemeral gully erosion by preferential flow through a discontinuous soil-pipe
Understanding soil-pipe flow and its role in ephemeral gully erosion
Soil-pipe gasket