The main goal of this project is to observe, understand and reduce the impact of plastic waste on urban flooding. To achieve this, three steps are defined. First, advanced technologies will be used to provide reliable and frequent observations of urban rainfall and plastic waste. Second, new data will be used to develop an urban rainfall-runoff model. This model will be used for improving fundamental understanding, flood forecasting, and optimizing flood risk reduction strategies. Finally, (preliminary) results will be disseminated to stakeholders, such as local water authorities, funding organizations, governments and policymakers. Stakeholders can use the data and modeling results to plan interventions focused on reducing urban flood risk.