Patent ID: 7344335

Claim:
A method for retaining or detaining storm water beneath a ground surface comprising the steps of: placing a first level within the ground comprising a plurality of modules in a first configuration, wherein each module comprises a horizontally disposed deck portion and at least one substantially vertically disposed side portion extending therefrom, said deck portion and said side portion have respective end edges, and said side portion respectively having an edge opposite the deck portion; placing a second level within the ground comprising a plurality of modules in a second or inverted configuration, said inverted modules being supported by the first level, wherein each inverted module comprises a corresponding horizontally disposed deck portion and at least one corresponding substantially vertically disposed side portion extending therefrom, said deck portion and said side portion of said inverted module have respective end edges, and said side portion respectively having an edge opposite the deck portion; connecting a plurality of longitudinal channels each defined by at least a portion of a selected one of the first level and the second level; and connecting a plurality of lateral channels each defined by at least a portion of a selected one of the first level and the second level.