These conference proceedings reflect the current and future roles of modeling and optimization in the description and management of water industry systems. Balanced views of academic and industry experts from around the world are included in the two volumes of papers. Insights are provided into the experiences of leading researchers and practitioners in applying modelling and optimization to the management of water quantity and quality. The topics covered are: advanced modelling techniques, risk management, process control and optimization, with particular emphasis on the development and implementation of emerging technologies. Application areas include both water supply and waste water disposal.