Author(s): Karen L. Rojas-Gomez; Jakob Benisch; Bjorn Helm; Dietrich Borchardt; Peter Krebs
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Abstract: In urban areas, impervious surfaces accumulate contaminants and particulate matter. Fine particles carry particle bound pollutants like heavy metals and are highly mobile in the urban water system (Charlesworth & Lees, 1999). These fine particles are emitted from combined and separate sewer networks during storm events affecting the condition of the urban stream. Therefore, the concentration of fine suspended solids with a particle size smaller than 63 um was introduced as a reference parameter for urban drainage impact assessment in Germany. In order to improve sediment management and the quality of the receiving water bodies, it is necessary to assess sediment sources, pathways and storage in urbanised catchments (Taylor & Owens, 2009). This study aimed at characterising the impacts of urban wet weather discharges (UWWDs) along a downstream urbanisation gradient in a small stream in Dresden, Germany. The export of fine sediments and the concentration of heavy metals in both suspended sediments and stream bed, was evaluated along the urban gradient. Including a comprehensive analysis of different sewersheds.
Year: 2024