Aia nā huahana Tri-planar i nā iwi ʻaoʻao HDPE waena e hāʻawi i ke kahe kahe, a kau ʻia ma luna a me nā kaula i lalo e hōʻemi i ka komo ʻana o geotextile.Hāʻawi ka hoʻopaʻa ʻole ʻana i ka ʻōnaehana kumu i ka transmissivity kiʻekiʻe ma mua o nā huahana bi-planar.