Recent studies acknowledge the impact that stormwater has in receiving waters, often as great as wastewater, in urban contexts. Despite being widely studied, modelling of urban stormwater runoff has proven a challenge due to relevant spatial and temporal variability, and a short understanding of the build-up processes of diffuse source pollutants in dry weather. Current water quality evaluation is based on the level of faecal contamination, through faecal indicator bacteria, such as E. coli and enterococci. As pollution mitigation measures are currently converging towards treat-at-source...