The IWA/IAHR Joint Committee on Urban Drainage (JCUD) is operated jointly by the International Water Association (IWA) and the International Association on Hydraulic Engineering and Research (IAHR). This joint oversight has been established to emphasize and promote effective interactions between experts on hydraulic aspects (main focus of IAHR) and on water quality aspects (main focus of IWA); such aspects are intrinsically inter-related in the field of urban drainage.