Patent ID: 7661903

Claim:
A drain field assembly having a top edge and a bottom edge and positionable in a trench in an area of soil, the drain field assembly comprising: a distribution pipe configured for receiving effluent from a sewage disposal system into an inlet at a first end, the distribution pipe having a longitudinal axis, a wall defining an interior space, and a plurality of holes through the wall into the interior space; a plurality of void pipes for receiving effluent from the distribution pipe holes, retaining the effluent for a time, and distributing the effluent to the area of soil surrounding the trench, each void pipe having a longitudinal axis, a wall defining an inner space, and a plurality of holes through the wall into the inner space, the void pipes positioned relative to one another so that a top void pipe is above a bottom void pipe, the distribution pipe positioned within the inner space of the top void pipe; and wherein the distribution pipe comprises a first distribution pipe and a second distribution pipe configured for receiving effluent from a sewage disposal system into an inlet at a first end, the second distribution pipe having a longitudinal axis, a wall defining an interior space, and a plurality of holes through the wall into the interior space, the second distribution pipe positioned atop and vertically offset from the top void pipe and the first distribution pipe.