Patent ID: 8251302

Claim:
An attachment for use in a gravity flow, surface drainage system configured to direct water from an elevated water source to a drainage location, the attachment comprising: a circular inlet end including an intake opening, the intake opening comprising an inlet width and an inlet height, the inlet end including a center point; a rectangular outlet end including an outlet opening, the outlet end comprising an outlet width and an outlet height, wherein the outlet width is greater than the outlet height; and a transitional section between the inlet end and the outlet end, wherein the transitional section increases in width and decreases in height towards the outlet end; wherein the outlet opening is positioned below the inlet end center point such that gravity influences water flowing through at least a portion of the attachment; wherein the outlet width is greater than the inlet width to disperse water flowing through the attachment and out of the outlet opening, thereby reducing the effects of erosion at the drainage location adjacent the outlet opening; and wherein the attachment is polymeric.