Abstract
It has become evident that emission control standards for stormwater overflow design are practical, but not sufficient to guarantee ecologically balanced quantity and quality characteristics of receiving natural water bodies. The quality and quantity of both stormwater overflow and the receiving water should be considered at the same time. One objective of the investigation was to apply a continuous complex hydrological (quantity) model for simulating combined urban and rural runoff processes to a small catchment in Northrhine-Westphalia to get more information on its suitability as a modern planning tool. The study focuses on the general applicability of the method proposed, data availability, the estimation of model parameters, and the reliability of results produced. Another objective was to solve a practical engineering problem with the methodology proposed. The results show that the method can be used to produce a sample of simultaneous overflow/riverflow events, which subsequently can be evaluated statistically. Data availability and computational efforts are suitable for general application.
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