Filimonova I. G. RussiaSaratovBerg State Researh Institute on Lake and River Fisheries, Saratov branch, 152 Chernyshevskogo Str., Saratov 410002, Russiashash.elena2010@yandex.ru Author's articles FORMATION OF THE HYDROCHEMICAL REGIME OF THE UPPER REACHES OF THE URAL RIVER UNDER CONDITIONS OF TECHNOGENIC FLOW REGULATION