In 2007 Urban Water Solutions developed an all-pipe/all-property hydraulic model of the Altona sewerage system for City West Water.  The model, which was calibrated against 27 flow and salinity monitors, accurately predicted flows and salinity concentrations during dry and wet weather periods.  The model then formed the platform for assessing the effectiveness of a range of augmentation options developed to reduce the effluent salinity concentration at the Western Treatment Plant.