Mass balances conducted on soils adjacent to highways indicated low mobility of metals deposited on well-vegetated surfaces. Grass drainage channels were shown to effectively capture and retain metals (e.g. a 60 m channel removed 80 percent of the original Pb concentration). Mud or paved channels, however, demonstrated little or no ability to remove metals from runoff. Metal release studies suggested that acid precipitation could release metals bound in the soil, especially where low buffering capacity exists.
August 4, 2007
Tzn-Siang Wang, Dimitris E. Spyridakis, Brian W. Mar, Richard R. Horner.
University of Washington. Environmental Engineering and Science Program.
- # of Pages: 44 p., 776 KB (PDF)
- Subject: Contaminants, Deposition, Ditches, Drainage, Filtration, Grasses, Heavy metals, Highways, Motor vehicles, Pollutants, Pollution control, Road materials, Runoff, Vegetation, Water quality.
- Keywords: Washington State, heavy metals, runoff, water pollutants, highways, transport, deposition, overland flow.
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Highway Runoff Monitoring: The Initial Year, (WA-RD 39.3).
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This abstract was last modified April 29, 2008