ИСТИНА

The study describes maximum water level in the lower reaches of the Amur River according to the factors of runoff in different parts of the Amur basin and Zeya river flow regulation. The analysis of water level changes during high-water season has been done, separately for the conditions of the natural flow variability (1955-1979) and after the start of operation of the Zeya hydroelectric complex (1980-2013). An average of 5 hydrological events contribute to the long-term water level fluctuations in the area of the Lower Amur (Komsomolsk-on-Amur). They are differed in the time of formation, duration and hydrological characteristics. The first storm corresponds to spring floods; the second – the fifth events are the result of loss of monsoon rains in the warm season. For given water stages of seasonal increase in water levels and flows the role of increased runoff, formed in the Amur basin in different years and during the absence or presence of the economic activity impact on the seasonal distribution of water flow, has been evaluated.