This paper presents the modification and the application of the conceptual wash-off model initially proposed by the SWMM on five separate urban catchments with very different characteristics and during a lot of rainfall events. To allow measurements on real sites to be considered, this model was incorporated in an overall model including simulation build-up, sediment transport in collector as well as runoff and hydraulics. This modified model has been calibrated, validated, transposed and completed with sensitivity analysis of parameters and initial conditions. The proposed model gives some improvement to the results of the initial model: an adaptation to a large range of rainfalls, the correct reproduction of the peak values and satisfying reproduction of the beginning and the end of the TSS pollutograph.

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