Plewa, KatarzynaWrzesiński, DariuszPtak, Mariusz2017-09-252017-09-252015Badania Fizjograficzne, Seria A, Tom 66, 2015, s. 131-1422081-6014http://hdl.handle.net/10593/19318This article seeks to determine the regime of water stages of two lakes, Lednica and Powidzkie, located in the Wielkopolskie Lake District. In the research, use was made of their daily water-level figures from 1984–2012. In order to establish the regime features of the lakes, the method hitherto applied in river regime studies was employed: an analysis of the temporal structure and type of lake water stages and their changes in an average annual cycle. As the research has shown, Lake Lednica has a 5-period regime structure, while Lake Powidzkie has no characteristic cycle of change in its water levels, a consequence of which is the 2-period structure of its regime. Because of the similarity of the location of the lakes and the natural conditions of their operation, the causes of their different regimes should be sought in their individual features and in human activity.polinfo:eu-repo/semantics/openAccesshydrological regimewater stageslakesArtykułhttps://doi.org/10.14746/bfg.2015.6.10