Patent ID: 8801326

Claim:
A group of arch shape cross section plastic leaching chambers, each chamber having a body portion comprising opposing side base flanges running along a length of the chamber in a base plane, opposing sidewalls running upwardly and inwardly from each base flange to a top of the chamber, and an interior concavity for receiving water during use; a first sub-group of chambers within the group having top heights which are different from the top heights of a second sub-group of chambers within the group; each chamber of said first and second sub-group further comprising: a first connector and a second connector, attached to opposing lengthwise ends of the body portion of the chamber, the first end connector shaped to overlap the second end connector of a like chamber to form a connector joint between two mated chambers; each connector having a base portion which is at the same elevation as said base flanges; and, each connector in fluid flow communication with said chamber interior concavity, so that when like chambers are connected, water can flow lengthwise between the interior concavities of any two interconnected chambers; wherein, all the first connectors of the first and second sub-groups have the same height and all the second connectors of the first and second sub-groups have the same height.