The influence of various characteristics of combined sewer systems on the overflow load has been analysed by means of long-term simulation. Special attention was paid to the sewer sediment. A simulation model that has been developed for this purpose comprises an approach for the sediment transport. This approach has been calibrated by means of various values of pilot plants. It has been demonstrated that the importance of the first flush is dependent on the bottom slope. The ‘dry weather balance' has been defined as a parameter which allows the determination of the overflow load from sewer sediments.

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