The identification and resolution of water quality impacts on receiving waters from urban discharges are now regarded as national priority targets by most water authorities throughout the world. These seminar proceedings provide an international perspective of the scale and nature of receiving water quality problems faced by the water industry. The papers highlight the significance of source, sewer and in-stream loadings on both short- and long-term receiving water quality control, rehabilitation and operational management are reviewed in a national context, and methods for developing wet weather criteria are described in detail. The papers bring together principles and techniques of interest to the urban hydrologist, sewerage engineer, water quality scientist and water manager.