barrière à faible perméabilité

OBS: perméable : Qui se laisse traverser ou pénétrer par un fluide, et en particulier par l'eau. «Roches, terrains perméables» : que les eaux d'infiltration traversent.

CONT: Shallow land burial consists of excavating a trench, placing waste containers in the trench up to a prescribed level, but generally below the original ground surface, backfilling between the containers with sand or other free-flowing earthen material and covering the trench with earthen material. The cover may be constructed of layers of different materials which serve as low-permeability barriers.