Civil · C-5YVZB

Bioretention Planter Box Drainage Detail

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This bioretention system consists of a prefabricated metal planter box set on a concrete slab adjacent to an existing building, with a minimum depth of eighteen inches of bioretention soil mix over a perforated pipe sloped at zero point five percent. A twelve-inch by twelve-inch drainage inlet connects to the underdrain system, maintaining a twelve-inch ponding depth and a two-inch freeboard. Invert elevations are marked throughout the piping run, including cleanouts positioned at typical locations.

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