Patent ID: 7914231
Filing Date: 2011-03-29
Classification: E03F

Abstract:
1. A leaching chamber having opposing inwardly and upwardly running sidewalls extending toward a top portion to form a plurality of peak and valley corrugations extending over the top portion, the leaching chamber comprising: a plurality of diagonally opposed ribs, wherein the plurality of diagonally opposed ribs are located in the valleys of the top portion and include a first rib extending in one direction diagonally across a part of the top portion between the peak corrugations on each side of the valley and a second rib extending diagonally across a part of the top portion in a direction that is a mirror of the direction of the first rib between the peak corrugations on each side of the valley to form an X shaped pattern across said part of the top portion in the valley, wherein said part of the top portion in the valley is free of any ribs extending along a lengthwise direction of the leaching chamber.