Ditchmen • NUCA of Florida Ditchmen • April 2017 - Page 28

system. The Board brought in DMK and Axis Engineering, PLC (Venice, Fla.) to further develop the West Dearborn Street Low Impact Design Pilot Project. The design team’s strategy was to “surround and capture” the storm water runoff with LID practices wherever possible. They recognized the importance of using a treatment train approach for an optimal level of pollutant reduction when runoff could not be eliminated and had to be discharged into Lemon Bay. The team also prioritized preservation of assets, re-use of materials and minimizing impervious areas in the design. The treatment train system is designed to convey road and roof runoff to nearby bioswales where engineered soil media provides a high level of treatment. Water then flows out of the underdrain to a re-use/ discharge pipe. During more intense storm events, excess runoff flows into the re-use/ discharge section that was constructed using 13,000 feet of 12- to 36-inch diameter N-12® HP pipe manufactured by Advanced Drainage Systems, Inc. (ADS) (NYSE: WMS). Pipe connections into this system were made using 74 ADS Inserta Tee® fittings in diameters ranging from 6 to 18 inches. The system used 109 FLEXSTORM® Inlet Filters to trap debris. The filter is adjustable to fit any drainage 28 DITCHMEN • APRIL 2017 structure and provide maximum protection while being easy to install and economical. The filter is available to fit all frame and grate castings and precast structures. It is made up of a rigid galvanized or stainless steel frame that supports a variety of filter bags designed to remove storm water pollution. Additionally, 135 Nyloplast® basins in 18 to 30 inches in diameter, which are basins that combine ductile iron grates with a rugged, heavy– duty PVC structure were used for the road-surface structures to filter silt, solids and other pollutants. The inlet filters and basins are also products of ADS. Due to the Best Management Practices in this system including the design and the products that have been proven to help meet the EPA’s National Pollutant Discharge Elimination System (NPDES) Phase II Storm Water Rule, this is a model project for others to also implement. For additional information, go to: www.ads-pipe.com. • • •