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  • Multi-year oscillations of the river water content are caused by departures from the average values of climatic runoff factors and the impact of economic activities. For majority of the USSR rivers the runoff norm has been established by 1961
  • . From data of water consumption by 1976 and calculations of channel water balances of basic USSR rivers a value of irretrievable water consumption is established which is equal to 149km per year| that is close to 3% from the magnitude of water resources