In the contribution we present the utilization of criterion C for the evaluation of topography of metallic materials surfaces generated by the abrasive waterjet. The criterion C provides a realistic picture of the proportion of waviness (low-frequency irregularities) to the total number of surface irregularities. The critical value of parameter Cc = 0.66 was determined experimentally for metallic materials. This value differentiates the surface into two morphologically different zones. The first zone, which is there in the upper part of the cut, is characterised by the absence of conspicuous striations, and thus is considered to be of good quality. The other zone is characterised by conspicuous striations and thus is taken as a zone of poor-quality. The parameter C can also be used in the classification of materials by machinability.
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