Oval pipe with a flat base

Claim 1

In combination, a synthetic resin drain pipe and an underlying synthetic resin support plate, said drain pipe being adapted for substantially horizontal installation along the flow axis of said pipe and being of oval cross-section, with the major axis extending vertically, said support plate comprising a flat portion and integral sidewalls bent upwardly from the flat portion with said plate being of U-shape cross-section and directly facing and underlying said oval drain pipe, a pair of ridges extending integrally from opposed sides of said oval drain pipe near the bottom thereof with said ridges being formed on said oval drain pipe and said said oval drain pipe and said flat plate having walls of vertical height such that said ridges abut the ends of said sidewalls and the bottom of said pipe abuts the surface of the flat plate intermediate of said sidewalls which directly faces said oval pipe to maintain said oval pipe in vertical orientation along its major axis to permit a greater depth of water therein at low water to maintain water flow through said drain pipe at considerable speed and prevent the accumulation of solid filth or sedimentation therein.