Patent ID: 7666301

Claim:
A settling and retention basin comprising a body including a tubular wall having a closed bottom wall, the closed bottom wall being separate and apart from a bottom wall of said body, means for conducting wastewater into an interior of said body, a flow equalization unit in the tubular wall, means for conducting wastewater from said flow equalization unit to an exterior of said body, said flow equalization unit including a chamber defined in part by the tubular wall, means for effecting flow equalization in a direction from said body interior into said chamber and downstream thereof through said tubular wall, and means for removably supporting said flow equalization effecting means relative to said tubular wall whereby said flow equalization effecting means can be removed and replaced by other flow equalization effecting means possessing flow equalization characteristics differing from the flow equalization characteristics of said first-mentioned flow equalization-effecting means to maintain a scum line at a height on said tubular wall that is within predefined wastewater flow characteristics, and said first-mentioned flow equalization effecting means including a flow port member, the flow port member including a flow equalization port disposed in a circular end wall of said flow port member and an outer circumference of said circular end wall connecting to a lower end of an upwardly and outwardly peripheral flow port member wall terminating in a radially outwardly directed peripheral flange.