Abstract
During rain events, run‐off waters from urban areas are carried by combined sewer systems towards wastewater treatment facilities. The characteristics of these waters are different from those of usual wastewaters especially concerning flow. The data obtained during the sampling programme compared with the knowledge found in the literature review lead to the conclusion that the variations in flow and concentrations of nutrients measured during the sampling period would not have caused any important changes in the operation of a biological wastewater treatment system.

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