Immission-based management of the urban wastewater requires a holistic consideration of sewer network, treatment plant and receiving water. Modelling and simulation of this integrated system allows for scenario testing and operation suggestions in function of the river status. This paper presents a general approach to such model construction and calibration in the software WEST~R, containing all the model components needed. The paper focuses on the construction and calibration of the conceptual urban drainage and the method is illustrated on a case study in Luxembourg.
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