Chemical effects of a near-to-nature detention pond on a small urban headwater |
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| Institution: | 1. Department of Hydrology, Trier University, D-54286 Trier, Germany;2. Federal Institute of Hydrology, 56068 Koblenz, Germany;3. Luxembourg Institute of Science and Technology, Environmental Research and Innovation Department, Avenue des Hauts-Fourneaux 5, L-4362 Esch-sur-Alzette, Luxembourg |
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| Abstract: | The near-to-nature approach has been established as best practice for stormwater management. However, pollutant mobility within such systems and its impact on small receiving waters are partly unexplained. The study takes place in an urbanised headwater catchment in south-western Germany with an area of 0.4 km2. Runoff from roofs, roads, parking lots and gardens is collected in wells or trenches and stored in private and public dry detention basins. Accordingly, this study investigates pollutant input to a detention pond, removal efficiency and the associated effects on the receiving water.Grab samples with high temporal resolution of the receiving water (16 flood events with 315 samples and 41 baseflow samples), the three inflows of the detention basin and its outflow (four flood events with 64 samples) were taken. The outflow of the dry pond is recovered in the hydro- and chemographs of the receiving water. Runoff from roads with increased traffic volume caused the highest PAH inputs and runoff from the residential area showed the highest zinc concentrations, which partly infringe European Environmental Quality Standards. Yearly pollutant inputs (DOC, TSS, PAH, nutrients, metals) from the settlement into the tributary are reduced in the detention pond by up to 80%. |
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| Keywords: | chemograph detention pond metals PAH rainwater management urban hydrology |
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