In North Rhine-Westphalia, Germany a project for the evaluation of sewer flow quantity and quality models was carried out with the aid of measured data in 1986 to 1991. Measurement projects in two real subcatchments in the cities of Solingen and Düsseldorf delivered the data for model calibration and verification. 10 models with different approaches for quantity and quality simulation took part in a relative and an absolute comparison. This report focuses on some selected results of the absolute comparison and discusses the reliability and accuracy of model application.

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