Water is of increasing importance in the design of new residential areas in The Netherlands. In addition to the need for water retention in urban areas, people generally prefer to live near open water. The water quality of the newly designed urban water systems is subject to uncertainties. In recent years, WL / Delft Hydraulics has been commissioned to provide water quality advice with regard to this issue to several engineering companies. For this reason, a guide was developed which supports the water quality research of new urban water systems. A thorough uncertainty analysis of urban water systems forms the basis for this guide. The guide starts with a general description of problems and points of attention for the water quality of new urban water systems. Subsequently, the guide provides detailed information on several specific topics, such as the water quality of urban runoff and the internal loading of pollutants from the sediment. Finally, the guide provides recommendations for the best strategy for dealing with uncertainties in future water quality issues. It is advisable to develop the guide further and to include practical experience with the design of a new urban water system and the resulting water quality. |