Simultaneous variations of Cl- and NO3- concentrations were recorded in a 570 ha catchment and 4 sub-catchments. The smaller the catchment, the weaker is the dependence of NO3-concentration on the water cycle. On the basis of the data, a representative elementary area of about 100 ha is defined on the studied site.
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VYZKUMNY USTAV ENERGET,BEZPECNOSTI PRACE LAB,CS-25097 PRAHA 9,CZECHOSLOVAKIAVYZKUMNY USTAV ENERGET,BEZPECNOSTI PRACE LAB,CS-25097 PRAHA 9,CZECHOSLOVAKIA