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Using High-Flow Biofiltration to provide Runoff Reduction

Runoff reduction, pollutant capture, and peak-volume management are the main functions of Green Stormwater Infrastructure (GSI). By managing stormwater pollution and runoff volume in smaller watersheds closer to the source, GSI can more closely simulate a natural response to rainfall despite an increase in imperviousness compared to other stormwater management practices. High-flow biofiltration practices have not always been accepted as GSI due to their high flow-through rate and assumptions that such rates could not provide significant runoff reduction, despite providing enough pollutant removal credit to meet water quality requirements. This presentation will share data gathered from the field of a manufactured high-flow biofiltration device that has demonstrated significant capability for stormwater runoff reduction. An overview of this data, site selection, and device design will provide guidance to using innovative systems to meet GSI goals.