These triennial conferences serve to disseminate research results to the international urban drainage community. The past years have seen the conference subject undergo significant changes, both toward increased detail in process understanding and toward understanding integrated aspects related to natural and technical sciences, as well as social and environmental issues and management. The conference topics include: urban rainfall; urban hydrologic processes; hydraulics of urban drainage; transport, accumulation and washoff of pollutants in urban areas; processes in sewer systems; water quality in urban areas; impact mitigation and restoration of heavily modified water bodies; priority pollutants in urban drainage; stormwater treatment; source control and best management practices (BMPs); low impact development techniques (LIDs) and sustainable urban drainage systems (SUDs); rainfall harvesting and water reuse; modelling and simulation of integrated urban water systems; and geographical information systems and decision support systems.