The study presented in this paper deals with the computation of the increased hydraulic loading of the treatment plants in the Greater Copenhagen area due to the installation of more storage capacity in the combined sewer system in the future. A mathematical model is set up for the entire sewer catchment and predictions of future increased hydraulic loadings are made for various development scenarios. The computed inflow conditions are presented on a statistical form. The results show a significant increase in the hydraulic loading of the plants due to increased storage volume in the sewer system. The computed inflow statistics are used in the design of the treatment plants to ensure proper plant performance during prolonged periods with full hydraulic loading due to storm water.

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