The project aims at the imnprovement of the anatysis of the effect of man's technological activities on the environment, particularty in relation to the production, manipulation and use of toxic and radioactive substances, their long term storage and disposal of wastes. In the case of an accident, which can be caused by a fault in the man's activity or by a catastrophe, there are risks of contaminants release and their diapersion into the surrounding of a plant, transport path, repository, etc. The mainmains of the project consist in the modelling and simulation of transport processes of contaminants in the engineered barriers, which separate the disposal facility from the geosphere, and of their migration or dispersion in the surface water flows and reservoirs, which can be contaminated due to the release of toxic substances. In both cases the contamination can be consequently spread into soils, surface- and groundwater, fauna and flora, and man's food resources. Tho effectiveness of countermeasures