Pollutant Concentrations in Road Runoff: Southeast Queensland Case Study
Publication: Journal of Environmental Engineering
Volume 126, Issue 4
Abstract
This paper discusses the results of research into the pollutants in runoff from road pavement surfaces following natural rainfall events. Road runoff water quality was monitored at 21 sites centering around Brisbane, in southeast Queensland, Australia. The sites were selected according to traffic volumes, surrounding land use, pavement surface type, ease of access, and commercial vehicle percentage. Bridge sites were chosen for convenience of sample collection and minimized infrastructure modification. “First flush” grab samplers were permanently installed at each site to collect the first 20 L of runoff from one of the bridge drainage scuppers. The runoff samples were tested for a number of heavy metals, hydrocarbons, pesticides, and other physical characteristics. The observed results fall within the ranges of concentrations reported internationally and nationally but do not typically follow the “30,000 average annual daily traffic” results reported in the United States. Traffic volumes have not been found to be the best indicator of road runoff pollutant concentrations. Interevent duration has been found to be a statistically significant factor for pollutant concentrations. Sites incorporating exit lanes have recorded higher concentrations of acid-extractable copper and zinc, tending to support the hypothesis that brake pad and tire wear caused by rapid deceleration contributes to the concentrations of these metals in road runoff. Laser particle sizing has shown that a significant proportion of the sediment found in the runoff is <100 μm. However, these particulates do settle in water within 24 h, under laboratory conditions. This may be due to the presence of heavy metals.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 126 • Issue 4 • April 2000
Pages: 313 - 320
History
Received: Mar 22, 1999
Published online: Apr 1, 2000
Published in print: Apr 2000
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