Currently, little is known about the properties of sanitary gross solids or their transport mechanisms in sewers. This paper describes a project designed to study solids movement in small gravity sewers by laboratory, field and modelling work. Results of laboratory tests on gross solids' transport under steady flow conditions are presented. An ‘idealised’ field-based sewer has been constructed and will be used to monitor solids' movement under non-steady, intermittent flow. A computational model based on a method of characteristics solution of the St Venant equations has been produced. This will be extended to account for solids' erosion, transport and deposition.

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