Water drain tank or channel module

An assembly of modules to create a water drain tank or channel, wherein each module comprises a structure having a top platen and a bottom platen, a plurality of generally vertical support members for supporting the top platen, the support members being retained in sockets on at least one of the bottom platen and the top platen, and side walls as are necessary to form outer peripheral side walls of the assembly, each module side wall comprising a water-permeable lattice member that is adapted to support an impermeable membrane or a water-permeable geotextile material capable of controlling the flow of drain water at least out of the assembly and restricting sediment from entering the assembly, to create a tank or drain channel, and wherein at least the outer peripheral walls of the assembly are at least partially covered with the geotextile material.