Patent ID: 8590221

Claim:
A drainage system comprising: a modular panel having a planar base; a first sidewall and a second sidewall; wherein said first sidewall upwardly and perpendicularly extending from said base and said modular panel comprises a first end and a second end; the first end further including an L-shaped flange integrally forming with the first end; wherein said second sidewall upwardly and perpendicularly extending from said base; a first flange outwardly extending from said second sidewall; a second flange downwardly extending from said first flange; wherein the system further comprises a double standing seam overlapping at least a portion of said second sidewall, the first and the second flanges; said double standing seam and said L-shaped flange are continuously formed and connected to each other at the first end; and the system further comprising a single standing seam supporting the first end from a bottom side of the modular panel.