The project Stormwater data management in climate resilient spatial planning (HUIKKA) aims at developing and enhancing the use of stormwater data in urban planning. Climate change is expected to increase rainfall, and with urban densification, the importance of sustainable stormwater management practices is growing. In the Helsinki Metropolitan Area, information about catchment areas, flows and existing stormwater management structures and solutions has previously been scattered across HSY's (Helsinki Region Environmental Services Authority) and the metropolitan cities' own databases. This data has recently started to be collected in a shared database. This database will be further developed in the HUIKKA project to serve spatial planning and other urban development efficiently. Urban planners will be guided to obtain and make use of available stormwater data as well as to save new information formed in the planning processes in the database for future use. This will enhance the integration of climate change adaptation needs in urban planning. The HUIKKA project creates cooperation within the metropolitan cities as the catchment areas extend across the cities, and in developing stormwater management solutions, the effects to the whole area should be considered.