Abstract
AbstractParticulate matter, nutrients, and gross solids from roads contribute nonpoint-source pollution to waterways. To inform road runoff management, a field monitoring study was undertaken at eight road sites across North Carolina. Particle size distributions (PSD) of edge-of-pavement runoff samples were analyzed to understand the granulometry of the particulate matter. Knowledge of PSDs is critical when attempting to understand sediment fate and transport through stormwater control measures (SCMs), especially when the primary removal mechanism is particle settling. For 43 road runoff events, median particle size varied from 31 to 144 μm. The median PSD from hot mix asphalt (HMA) was 2.6% clay, 44.8% silt, and 52.6% sand. PSD was not correlated to roadway classification or ecoregion; however, PSD was significantly correlated to the presence of a permeable friction course (PFC) overlay, which is a layer of porous asphalt placed over traditional HMA. The median d90 for PFC (131 μm) was significantly smal...
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