Patent ID: 7008137

Claim:
A drainage arrangement with a cover for a drainage channel installed in the ground to drain a surface of an area, comprising: a substantially planar portion constructed so as in use to be capable of covering an opening defined at the top of the drainage channel, the planar portion defining supplementary apertures to receive water that in use has percolated down, and a projection that extends upward substantially vertically from the planar portion and that defines an inlet through which water that rims off from the surface to be drained can enter the drainage channel, and a damp-proof sheet, wherein at least one edge region of the planar portion of the cover is covered by the damp-proof sheet that in use separates an upper pavement layer from a lower supporting layer of the area to be drained, and wherein the planar portion is substantially covered by the damp-proof sheet into which openings have been our such that the positions of the openings in the damn-proof sheet coincide with those of the apertures in the planar portion.