Patent ID: 7611306
Filing Date: 2009-11-03
Classification: E03F

Abstract:
1. A molded plastic arch shape cross section corrugated leaching chamber having opposing side perforated sidewalls having perforations for passage of wastewater from the interior of the chamber into the surrounding soil, which comprises: opposing side feet of the chamber, for supporting the chamber on soil during use, opposing perforated sidewalls, running upwardly from each foot; wherein at least one foot comprises a horizontal base flange; a vertical fin, running along the outermost edge of the horizontal base flange; a multiplicity of spaced apart ribs running along the horizontal base flange, to connect an opposing perforated sidewall of the chamber to a respective fin; wherein the ribs, and local portions of the respective opposing perforated sidewall, fin and flange define at least one compartment on the horizontal base flange with the perforations serving to direct water flow into each respective compartment; and, at least one drain hole through the foot, to enable water flowing into the compartment to flow into soil outside the compartment, wherein the at least one drain hole is configured such that the total flow area of the at least one drain hole is at least equal to the flow area of the perforations which direct water flow into the respective compartment.