This paper describes a mathematical sediment transport model for sewers. The model consists of a full hydrodynamic description running in parallel with a morphological model. Four different sediment transport formulations have been implemented in the model. Fredsøe's method for the calculation of the resistance from bed forms is compared to experiments carried out at Chalmers Technical University, Sweden. The model can be used as a tool for the analysis of sewer systems with sediment deposits. The model is being developed as part of a study being carried out at the University of Aalborg, Denmark and VBB-VIAK, Sweden.