Patent ID: 8322948

Claim:
A molded plastic chamber for receiving and dispersing water when buried in soil, comprising: (a) a first end and a second end separated along a lengthwise direction; (b) opposing side base flanges, running lengthwise and spaced apart in a widthwise direction, having portions substantially lying in a base plane; (c) a concave chamber wall, having corrugations running in said widthwise direction, the wall running from the one base flange to the opposing side base flange, thereby defining a concave chamber interior; and, (d) one or more pillars, each pillar comprising a pillar wall which (i) is integrally connected with the concave chamber wall at the perimeter of a hole in the concave chamber wall; (ii) projects downwardly into the concave interior of the chamber; (iii) tapers inwardly in the downward direction; (iv) terminates at a pillar base, wherein at least a portion of the base lies in said base plane; and, (v) surrounds a hollow space which is in communication with the space above the chamber.