The key challenge addressed by this project is the increasing pressure of urbanisation in growing cities which make city rivers and streams with their water basins vulnerable for the effects of climate change, such as flooding due to increased rainfall, erosion of the stream banks during high flows, and pollution from the storm water runoff and from surrounding land use. The overall project aim is to support adaptation to negative effects of climate change and to improve green and blue infrastructure of densifying cities through integrated nature-based solutions (NBS) for urban flooding and stormwater management. Furthermore, the goal is to make the living environment for the inhabitants more inclusive, healthy, and attractive. In the development of NBS, the project builds on the watershed approach allowing a clear geographical and hydrological definition of an area to be managed, as well as on a strong focus on stakeholder engagement. Applying NBS for watersheds will help us to be better able to prepare for the multiple challenges posed by climate change and city densification, e.g. the increasing amount of stormwater, heat island effect and biodiversity loss. In the project, partner cities will create a joint operational model for the development of NBS for resilient urban watersheds. The operational model will be piloted in each partner city for developing, monitoring and maintaining NBS at a selected water basin with participatory approach for stakeholder engagement.