Warne #4241 Bioretention was completed under a contract with the Metropolitan St. Louis Sewer District as part of their CSO (Combined Sewer Overflow) Volume Reduction Green Infrastructure Pilot Program. This project consisted of excavation and installation of grade controls, installation of sewer pipe and a manhole, removal and replacement of sidewalks, driveways, and asphalt, installation of approximately 800 square feet of bioretention cell and flagstone forebay, addition of amended soils, mulch, boulders, and river cobbles, and installation of approximately 1,500 native perennial plantings.
Construction on the Warne Bioretention project began in September of 2013 and completed in October 2013. This bioretention cell will act as lot sized rain garden, capturing, dissipating, filtering, and draining stormwater and neighborhood run off. This will help to facilitate the overall goal of the program to use green infrastructure practices to reduce the volume of CSOs by reducing the volume of stormwater that goes into the combined sewer system.