Calibrated Models of Deicing Agent Solids, Pavement Texture, and Specific Conductivity of Highway Runoff
Publication: Journal of Environmental Engineering
Volume 132, Issue 12
Abstract
Field data and existing theory suggest that pavement texture governs the seasonal persistence of deicing agent solids and the storm scale variability of the specific conductivity of highway runoff. We measured precipitation, runoff, and specific conductivity for 50 storms over four deicing seasons at a highway drainage system in southeastern Massachusetts. An average pavement texture of was measured and of calcium magnesium acetate, salt, and premix applications was reported as well. Catchments and a depression storage layer model the highway drainage system, which routes hyetographs and slowly dissolving deicing agent solids to storm scale hydrographs and specific conductivity pollutographs. We equate the average pavement texture to the depression storage layer depth, which receives applied deicing agent solids, controls their dissolution during a storm, and governs their seasonal scale persistence. The observed average pavement texture, precipitation, and deicing agent applications yield first flush (storm scale) specific conductivity values in the depression storage layer that range from a winter maximum of to summer values two orders of magnitude lower. The winter maximum, or seasonal scale first flush of specific conductivity, would be lower for rougher pavement due to slower dissolution. The rougher pavement would also induce stronger persistence of deicing agent solids throughout the year, so that appreciable storm scale first flushes would occur in the summer.
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Acknowledgments
The Massachusetts Highway Department funded this research under Interagency Service Agreement No. 7721 with the University of Massachusetts at Amherst. The writers acknowledge and appreciate the logistical and sampling support provided by District 5 of MassHighway. The views, opinions, and findings contained in this paper are those of the writers and do not necessarily reflect MassHighway official views or policies. This paper does not constitute a standard, specification, or regulation.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 132 • Issue 12 • December 2006
Pages: 1562 - 1571
Copyright
© 2006 ASCE.
History
Received: Oct 18, 2004
Accepted: May 15, 2006
Published online: Dec 1, 2006
Published in print: Dec 2006
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