Patent ID: 8770890

Claim:
An assembly for managing the flow of water beneath a ground surface comprising: a plurality of modules, each module including a deck portion and two supports that are load-bearing and extend from the deck portion to a bottom of the module; each deck portion having a respective main section and two cantilevered sections extending laterally from the main section, the deck portion being located on top of the supports of the respective module, the deck portion having opposed side edges and opposed end edges, wherein each of said two supports is spaced inwardly from the nearest side edge of the nearest cantilevered section, wherein the side edges of the deck portion are side edges of the cantilevered sections; wherein the supports for each of the modules are spaced apart from one another and together with the main section of the respective deck portion define an interior channel for fluid flow through the module; wherein each cantilevered section and its nearest support in the same module define at least partially an outer channel for fluid flow, and wherein the interior channel and the outer channel are generally parallel to each other; wherein at least one of the supports includes two spaced-apart, load-bearing legs that at least partially define a cross channel between the legs; wherein the cross channels, the outer channels, and the interior channels are in fluid communication; wherein each of the modules comprises concrete; wherein the assembly includes at least three modules, at least two of which modules are aligned longitudinally and at least two of which are aligned laterally; and wherein the thickness of the deck portion of each of the modules is smaller than the deck thickness that would be required if the deck section did not have a cantilevered section extending beyond said supports.