Sediment source tracing in a lowland agricultural catchment in southern England using a modified procedure combining statistical analysis and numerical modelling

► We describe the application of a modified composite sediment source fingerprinting procedure. ► The procedure includes a new approach for verifying composite fingerprints. ► Agricultural and diffuse urban sources are included in the source apportionment. ► Findings reveal the catchment scale importance of farm track and channel bank/subsurface sources. ► Uncertainty is explicitly recognised.