This paper presents analysis of meteorological, hydrological and hydro-chemical records collected in the years 1995-1998 in the upper catchment of the Grajcarek (the Small Pieniny Mountains). It was found that irrespective of water stages, concentrations of chemical components were at an average level. The loads, however, were significantly diversified. At lower stages, they constituted 4-7 per cent of the annual load, and at extremely high stages 23-33 per cent. The lower loads of all components were flowing out of the catchment A. The authors link this fact with the high afforestation of this basin. From the above data the conclusion can be drawn that the land use of a catchment has an effect on the chemical components of the runoff. It has particular importance in the case of mountain areas in view of the threat of water erosion.
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