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Filtration and Sorption BMP Modeling for Water Quantity and Quality

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  21st Century Watershed Technology: Improving Water Quality and Environment Conference Proceedings, 21-24 February 2010, Universidad EARTH, Costa Rica  701P0210cd.(doi:10.13031/2013.29400)
Authors:   Billy J Barfield, Sam L Harp, John C Hayes, Mahesh Chalavadi, Sandeep Yeri, Glenn A Brown, Ellen Stevens
Keywords:   Best management practices, nutrient trapping, bacteria trapping, sediment trapping,, sorption, mechanical filtration, low impact development, IDEAL

Water quantity and quality models are presented for storm water BMPs that primarily filter sediment, chemicals, and bacteria. Included are models for bioretention cells, stormwater sand filters, infiltration trenches, and bioswales. These models speciate sediment into aggregates and primary particles classes with a size distribution within the each particle class; chemicals into particulates, sorbed, and dissolved; and bacteria into sorbed and planktonic (floaters). Trapping of each species is calculated using mathematical representations of physical and chemical based processes yielding outflow hydrographs, sedigraphs, chemigraphs, and bacteriagraphs. The impacts of chemical additives and clay particles on sorption of chemicals and bacteria is predicted along with impacts of mechanical filtration and settling. An example analyses of the impact of the ratio of BRC surface area to watershed are is given to illustrate that simple rules of thumb are questionable methods for designing LID BMPs.

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