Patent ID: 8316601

Claim:
A drainage system comprising: at least one frame having at least three pairs of frame engaging elements; at least a first and a second drainage basin, each drainage basin having an outer and an inner surface, and being formed from a single sheet of material and further comprising: a central region and first and second side ends; a first frame engaging structure positioned at the first side end, the first frame engaging structure comprising an inwardly directed leg having a retention lip engagement flange configured to engage one of the frame engaging elements; a second frame engaging structure positioned at the second side end, the second frame engaging structure comprising an inwardly directed leg having an inboard retention lip engagement nub and an outboard retention lip engagement flange configured to engage opposing adjacent frame engaging elements; and a slot covering flange extending beyond the first frame engaging structure, whereupon the slot covering flange covers the area formed by the cooperation of the first frame engaging structure of a first drainage basin with the second frame engaging structure of a second drainage basin, the slot covering flange defined by extending the single sheet of material beyond the central region, folding the single sheet of material over itself so as to overlie the portion of the sheet of material that extends beyond the central region a distance substantially dimensionally equal to the outboard retention lip engagement flange of the second frame engaging structure, and terminating at the first frame engaging structure, wherein the first frame engaging structure extends therefrom in a substantially perpendicular orientation to each of the slot covering flange and the central region.