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This paper presents a new “WaterMet²” model for integrated modelling of an urban water system (UWS). The model is able to quantify the principal water flows and other main fluxes in the UWS. The UWS in WaterMet² is characterised using four different spatial scales (indoor area, local area, subcatchment and system area) and a daily temporal resolution. The main subsystems in WaterMet² include water supply, water demand, wastewater and cyclic water recovery. The WaterMet² is demonstrated here through modelling of the urban water system of Oslo city in Norway. Given a fast population growth, WaterMet² analyses a range of alternative intervention strategies including ‘business as usual’, addition of new water resources, increased rehabilitation rates and water demand schemes to improve the performance of the Oslo UWS. The resulting five intervention strategies were compared with respect to some …