The economic analysis of water uses is one of the main components of river basin management plans (RBMP), as established by the Water Framework Directive. Thus the first-generation RBMP for Portuguese river basin districts (RBD) 6 – Sado/Mira, 7 – Guadiana and 8 – Ribeiras do Algarve included a thorough economic analysis of urban drinking water supply (WS) and wastewater drainage and treatment (WWDT) systems. T...