An underdrain pipe penetrates a treatment planter concrete wall utilizing a coupler connection, with non-shrink grout or cast-in-place concrete filling the core around an LCT gasket or equal for smooth-walled pipe. The four-inch minimum diameter dual-wall polyethylene pipe features slotted perforations conforming to AASHTO Class II specifications, oriented in the valleys of corrugations at one hundred twenty degree typical spacings. A cleanout riser assembly extends above the design ponding elevation, featuring a cleanout pipe of the same size and material as the underdrain pipe, surrounded by four-inch cobbles and soil-tight fittings.
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