Development of a Guideline for Sewer Operation and Maintenance in Austria

This paper reports on an investigation that aimed to develop appropriate sediment management strategies for a small combined sewer network. Field data from a 2-year field study were used to illustrate the potential impacts of various strategies. The fieldwork collected data on the potential impact of persistent sediment deposits found in a large combined sewer in London. The data collected was used to support modelling of the hydraulic and the sediment behaviour in the local sewer system. The model results were used to investigate whether or not the sediment deposits found in sections of the main sewer would influence levels of surcharge and so impact on the risk of sewer flooding in the future. After it was established that sediment deposits in the main sewer could, under certain circumstances, change pipe surcharge levels, several sediment management options were examined in order to find the most suitable option. All options comprised additional planned operational activities combined with increased levels of infrastructure expenditure.