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. Expected Results: Within the RainDROP project, a storm water management (SWM) system will be developed, tested and disseminated. The primary results of the RainDROP project will be the provision of guidelines for storm water management for planning and implementation which are applicable not only locally and nationally in the project region, but also in other regions of CADSES. These guidelines will help to reduce surface water pollution and flooding and will improve the water balance and water quality. The project includes the integration of storm water management into urban drainage master planning in the five partner cities. Best management practices will be implemented and demonstrated in pilot projects for new development areas as well as for existing urban settlements through building measures, such as porous pavements, infiltration swales, trough-trench systems, cisterns or retention ponds. Current storm water management policies in other areas of CADSES will be examined and compared. Moreover, RainDROP will raise the public awareness of storm water-related problems.