Drain water basin cover - has float strips spaced apart between folding waterproof layers

摘要

The cover is for a basin containing liquid manure, drainwater etc., being shaped to fit in the basin and with floats supporting it on the surface. It has top and bottom folding waterproof covering layers (2,3), between which are flat float strips (4). The latter are spaced apart for a distance equal to at least double their thickness. Between the float strips the covering layers can be joined together at separate points or along a continuous line by welding, gluing , bolting etc.