“…and in drainage basins (plowing of land, deforestation, hydromelioration, etc.) (Prytkov et al, 2007;Cesoniene et al, 2017;Kacienė, 2018;Dudiak et al, 2019). For many years, the process of formation of river flow that is determined by patterns of long-term fluctuations and seasonal variations was considered as the result of many factors, which determines mainly scholastic approach to study of these patterns (Kartvelishvili, 1981;Ratkovich, 1997).…”