Patent ID: 7591610

Claim:
A water drain tank or channel module comprising a structure assembled from and having a top platen and a bottom platen, a plurality of generally vertical support members for supporting at least the top platen, the support members being separably retained in sockets on at least one of the bottom platen and the top platen, and from 0 to 3 side walls, each of the side walls, when present in the module, comprising a water-permeable lattice member, wherein at least one of the bottom platen, the top platen and the side walls is adapted to support an impermeable membrane or water-permeable geotextile material that is capable of controlling the flow of drain water at least out of the module and restricting sediment from entering the module, the module further comprising a void space between the top platen and the bottom platen, and extending everywhere between the walls, and in the absence of walls into any adjacent module void space, except for the support members, wherein no side walls are present when the module is used as an interior module in an assembly of the modules, wherein one side wall is present when the module is used as an outer module between corners of an assembly of the modules, wherein two opposed side walls are present when the module is used as a module between end modules in an assembly of the modules one module in width, wherein two adjacent side walls are present when the module is used as an outer corner module in an assembly of the modules, and wherein three adjacent side walls are present when the module is used as an end module in an assembly of the modules one module in width.