charnaque is incorrectly written and should write it as "Charnaques" being its meaning:
Structure with perforated surface ( 41 plastic; to separate from the floor ( 2 or 3 cm ) a flat surface, in a covered place ( by a modular tent / shelter improvised ) in which a ground is unpaved. Widespread use in the field military to improve soils of 34 shops; life 34 zones; in mobile military camps.