Rainwater (also called stormwater) runoff from urban areas can be a major reason for flooding and surface water pollution. Within the rainDROP project, stormwater management (SWM) will be developed, tested and disseminated in four work packages:1. Integration of stormwater management into urban drainage master planning will be carried out for the five partner cities in the Czech Republic, Germany, Greece and Slovakia.2. Different best management practices (BMPs, e.g. porous pavements, infiltration swales, trough-trench-systems, cisterns, retention ponds) will be demonstrated in pilot projects for new development areas as well as for existing urban settlements.3. Current SWM policies in the whole CADSES region will be investigated and compared.4. Finally a SWM guideline for planning and implementation will be produced. RainDROP will improve the awareness for stormwater related problems and seeks to reduce the negative impacts on water balance and water quality in the CADSES region.