This document, representing a summary of a wider report “Modelling of Stormwater Runoff from Green Urban Areas” (DHI, January 2015), is a contribution to better understanding the issues and practices related to modelling of storm runoff from green areas in urban catchments during extreme rainfall events potentially causing urban flooding. The purpose is to provide a practical guideline to all those who apply urban flooding modelling for the analysis of urban flooding and for planning mitigation measures e.g. as part of climate change adaptation measures.