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The report presents a detailed description of the WaterMet2 methodology and tool as a quantitative urban water system (UWS) performance model. The WaterMet2 model is described in three distinct parts. Modelling concepts of different components in WaterMet2 are first described. It provides an overview of the principle flows/fluxes modelled in spatial and temporal scales in WaterMet2 and how they are modelled within the framework of mass balance equations in four subsystems (water supply, sub-catchment, wastewater and water resource recovery). The second part describes the WaterMet2 software. This consists of an overview of WaterMet2 on how input data are prepared, how to run a simulation and finally how to retrieve results in different formats. This part also introduces the WaterMet2 toolkit functions which can be used by other programming languages to call a WaterMet2 simulation model. In the third …