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Abstract: Due to the increasing size of ships, the question arises as to the influence of shallow water on the behavior of ships in rough seas. In addition to changing hydrodynamic forces, shallow water causes a change in the flow and pressure distribution along the bottom of the heeled or rolling ship due to decreasing space between the ship and the seabed. This results in additional heeling moments. Within this paper these heeling moments are determined with KELVIN, a three-dimensional boundary element method based on potential theory. The moments will then be taken into account during seakeeping calculation in time domain using the ROLLS calculation method, which is also based on potential theory. KELVIN and ROLLS are part of the open method database E4, which was developed by the Institute for Ship Design and Ship Safety, among others, and use the same calculation model of a ship. The implementation within this framework enables the consideration of shallow water effects already in the early design phase without significantly increased modeling or computational effort. Large-scale measurements of the rolling motion of a ship are available for comparison. The aim of considering shallow water effects as early as during the design stage is to provide recommendations for the crew on board. It may also be possible in the future to quickly determine the behavior of a ship on the basis of weather forecasts and thus be able to react before accidents occur.