Patent ID: 7419331
Filing Date: 2008-09-02
Classification: E03F

Abstract:
1. An arch shape cross section corrugated leaching chamber having a base, a top, and opposing sidewalls running upwardly from the base to the top, the chamber which comprises: a sidewall having a portion which runs curvingly upwardly and inwardly toward the top of the chamber, the portion having a thickness and a plurality of upwardly spaced apart horizontally-extending slots for flowing water from within the interior of the chamber to the exterior of the chamber through the thickness of said sidewall portion; each slot having an opening height proximate the exterior surface of the sidewall, which height is the vertical distance between the horizontally-extending surfaces which define the slot; wherein, one or more of said plurality of slots which are at the upper part of the sidewall portion have opening height(s) which are greater than the opening height(s) of one or more of said plurality of slots which are at the lower part of the sidewall portion.