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Within the CEC-CIS study project JSP-1, a collaboration has been established between the Cybernetics Centre (CC) of the Ukrainian Academy of Sciences and CEC contractors to develop further the EC decision support system RODOS for offsite emergency management. The experience obtained in the CC during real-time computing of radionuclide dispersion in the River Pripyat and River Dnieper is being used to develop the surface water submodel of RODOS. To account for the large differences in temporal and spatial scales of the events under consideration, a hierarchy set of the radionuclide dispersion models has been developed. The set includes: box type model, one-dimensional (1-D) channel model, two-dimensional (2-D) lateral-longitudinal model, 2-D vertical model. These models have been applied to the River Rhine and its tributaries in collaboration with Kernforschungszentrum, Germany as a first step towards a surface water submodel of the demonstration version of RODOS.