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The project Research mud dynamics Ems-Dollard explores the reasons for the historic increase in turbidity, and which measures can be designed to improve the water quality in the area. Part of this research is the collection and analysis of sediment samples. These samples have been analysed to determine changes in the mud content with respect to 1989, obtain parameters for input and calibration of numerical models, and increase insight in the mud dynamics in the Ems Estuary by focussing on spatial variations and differences w.r.t. 1989. The mud content measured in 2013 is at some locations larger than the mud content measured in 1989 and at other locations smaller, even if part of this difference maybe due to methodological differences in laboratory analysis and collection of the samples. The bed of the main tidal channel in the Dollard (the Groote Gat) has become muddier, as well as the bed of the lower Ems River and the direct vicinity of the port of Delfzijl.