The 10th IWA Symposium on Modelling and Integrated Assessment (Watermatex 2019) will provide an international forum to present, discuss and exchange methodologies and international experiences on all aspects of water-related problems, within an interdisciplinary framework that relies heavily on the use of different types of models. Albert and Borja presneted a novel benchmark approach to assess novel control strategies for N2O mitigation and nutrient removal. Both the conference and the networking were great!