Liquid drainage system for flat surfaces

Abstract

The drainage system is for flat surfaces, especially roofs, terraces, baths, car parks, designed for drainage of water or other liquids from the area of the surface. The drainage system includes at least one rectangular plate, the lower surface of which is substantially flat and the upper surface is non-flat. At points on the upper surface, the inclination of at least a part of the upper surface is smoothly variable.

Dependencies are inferred from the claim text.