Biyo-baxa saddex-geesoodka ah (sidoo kale loo yaqaan biyo-mareenka geonet-ka saddex-geesoodka ah, tunnel geonet drain, network drainage): Waa mesh saddex-cabbir ah oo balaastiig ah oo ku xidhi kara geotextiles seepage-ka laba dhinac.Waxay bedeli kartaa ciid-dhaqameedka iyo lakabyada quruuruxda waxaana inta badan loo isticmaalaa qashinka, daadinta meelaha qashin-qubka, hoos-u-dhigista iyo darbiyada tunnel-ka.