Broadway Outfall Stormwater Retrofit Incorporating a CDS Unit

A major storm sewer outfall was retrofitted with a Continuous Deflective Separation (CDS) unit and a linear marsh to help treat stormwater discharged from an urban drainage basin in Tampa, Florida. The CDS unit was very effective for removing the gross solids including litter, trash, debris, leaves and sediments larger than 64 microns. These pollutants have not usually been evaluated in stormwater studies that use automated water quality sampler. Most of the gross solids were deposited between February and August 2003. During the first year of this ongoing study, about 300,000 cubic meter of flow passed through the system including both storm and base flow. The CDS unit removed 11.69 m³ (413 ft³) of gross solids from the flow stream including toxic levels of Polycyclic Aromatic Hydrocarbons (PAHs).