Historical records show that flooding per se is not a new problem in Jakarta, and that flooding has occurred throughout the city’s history. However, the impacts of flooding have increased in recent decades, as a result of changes in both physical (e.g. land subsidence and erosion) and socioeconomic (e.g. population growth and urban expansion) drivers. Moreover, the future flood problems in Jakarta may potentially be exacerbated due to climatic change. The project JCAT was set up to contribute to scientific knowledge and the development of methods and tools to assess flood risk in Jakarta. This report summarises the main findings.