``Slibvaren’’: Adjustment of the harbour admittance policy by reduction of the minimal required under keel clearance (UKC)

All harbours require frequent dredging to cope with sedimentation. In certain cases the deposited sediment/silt forms a weak soil layer referred to as fluid mud. The top layer is often used as nautical bottom, while its presence is not necessarily harmful to the vessel. This could lead to the conclusion that the safety margin underneath a vessel...