Assessment of deposited sediments in roadside stormwater retention basins

Engineers Australia
Publication Type:
Conference Proceeding
Proceedings of the 8th National Conference on Hydraulics in Water Engineering, 2004, pp. 1 - 8
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Previous studies have shown stormwater runoff from road surfaces to contain numerous contaminants. Most of these contaminants are bound to silt or clay sized particles. Hence, the fine sediments trapped in roadside retention basins may potentially have high concentrations of contaminants. This study was undertaken to assist in the development of a maintenance strategy for RTA retention basins. A key outcome from the study was determination of the contaminant concentrations in the sediments and hence the âWaste Classificationâ in accordance with the NSW EPA Waste Guidelines. Ten retention basins located on major highways in NSW were selected for the study. All retention basins were located in predominantly rural regions. Based on the chemical analysis of the sediments all contaminants except lead met the Inert classification criteria as outlined in the NSW EPA Waste Guidelines. Lead leachate concentrations in some samples (4 basins) were sufficiently high for the sediments to be classified as Solid Waste.
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