Preliminary assessment of fluxes of priority pollutants in stormwater discharges in two urban catchments in Lyon, France | Evaluation préliminaire des flux de substances prioritaires dans les rejets par temps de pluie dans deux bassins versants à Lyon, France

[Departement_IRSTEA]Ecotechnologies [TR1_IRSTEA]TED [Axe_IRSTEA]TED-EPURE [TR2_IRSTEA]BELCA

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anglais. In urban catchments, diffuse stormwater discharges from both separate and combined sewers contribute significantly to the contamination of water bodies by numerous pollutants, including the priority substances listed in the European Water Framework Directive. Whereas concentrations and loads of traditional pollutants (suspended solids, BOD, COD, nutriments) in stormwater discharges are well documented, very few information is available on the presence, the concentrations and the loads of priority substances. The ESPRIT project aims to identify, evaluate, characterise and later on model fluxes of priority pollutants in urban stormwater discharges. Two sites were chosen for measurement campaigns: Ecully (residential site, combined sewer) and Chassieu (industrial site, separate sewer). In total, 26 metals and 36 organic pollutants (in particulate and dissolved phases) are measured in stormwater discharges at the catchment outlets. Some results obtained for a set of rainfall events monitored since the beginning of 2008 are presented. Significant inter-site and inter-event variability in concentrations and specific fluxes (g/active ha) are observed for metals and organics pollutants, particularly for pesticides.