In recent literature, several approaches for the simplification of hydrodynamic sewer models are discussed. The aim of this study is to investigate whether it is possible to establish a rather simple and robust semi-automated procedure capable of simplifying the structure of arbitrary sewer networks to an extent where both simulation time and accuracy are within an acceptable range. The final procedure developed from these investigations is presented in the following paper for further discussion. A first application to two sewer networks of moderate size in a case study revealed that the developed procedure has the potential to simplify arbitrary hydrodynamic sewer models producing very accurate models. The simulation time is reduced down to about 30 %. Manual simplifications can be more efficient in terms of simulation time; however, the effort they require is exorbitant. Therefore, the presented semi automated procedure represents a good trade off between effort for the modeller and gain in simulation time. The gain in simulation time vastly depends on the models’ potential for simplification and the stability of the simulation.
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