Design of Integrated Bioretention-Infiltration Systems for Urban Retrofits

This paper presents the elements involved in the design of bioretention systems as an integrated part of an urban retrofit project. This project involved the design of systems to intercept much of the runoff from the first 2.69 inches of rainfall. Diverted flows were conveyed into bioretention systems for treatment. Due to space constraints, the bioretention systems were fingerprinted into areas comprising 2.5% of the contributory drainage areas. The system was modeled using HydroCAD, a design storm (DS) event modeling software. A four-compartment node system is used to model the dynamics of flow through the systems. The resulting response to a series of design storms is then presented.