Abstract
This paper presents continuation of the research on the functional model of river-sea ships operating in European system of transport corridors. It deals with a set of methods of determination of design assumptions for river-sea ships. Relevant calculations were performed on the basis of a future network of European routes for operating the river-sea ships within EU system of water transport corridors, in which rates of cargo flows and lengths of particular routes as well as their mathematical model were taken into account. In consequence, technical assumptions for designing the fleet of river-sea ships to be operated in European system of water transport corridors, were obtained.