I-geonet drain ye-three-dimensional geonet drain (ebuye yaziwe ngokuthi i-geonet drain ye-three-dimensional geonet drain, tunnel geo net drain, inethiwekhi ye-drainage): Iyinetha yepulasitiki enezinhlangothi ezintathu engahlanganisa ama-geotextiles angena emanzini ezinhlangothini ezimbili.Ingangena esikhundleni sezingqimba zesanti kanye netshe elivamile futhi isetshenziselwa ikakhulukazi udoti, ukuthululwa kwezindawo zokulahla imfucumfucu, izindawo ezingaphansi kanye nezindonga zomhubhe.