Modern urban water management and ageing infrastructure: Quantifying the impacts of sustainable urban water practices on excess sewer sediment deposition

This thesis aims to quantify the extent of any excess sewer sediment deposition from the implementation of sustainable water measures, predominantly Decentralised Water Recycling (DWR) and Water Demand Management (WDM). A literature review determined the change in wastewater quality and quantity from these measures and drove the development of a comprehensive sewer sediment model, SewerSedFoam (SSF). A combination of experiments in a sewer pilot plant and modelling with SSF was used to assess the impacts of DWR and WDM and found that excess sediment deposition was unlikely to occur from their moderate implementation in sewers that meet current design criteria.