Abstract
The patterns of formation of the average annual runoff in the basin of the Oba River and the rivers of the Kalbinsky Range were studied, meteorological characteristics were analyzed - average annual air temperatures and annual precipitation according to weather stations in Eastern Kazakhstan. Trends in changes in hydrometeorological indicators, and primarily the norms of these characteristics in conditions of climate warming, have been identified. The average annual water consumption of various water supplies in the modern period has been calculated. The analysis showed that over the long-term period since 1980, the annual flow of the rivers in question has decreased in the river basin. Both are 10.6% and 2.7% of the left bank tributaries of the Ertis. It should be noted that the emerging trend of increasing annual precipitation and average annual water flows of the rivers on the left bank of the Ertis since the beginning of 2010 may subsequently become stable, and in the future should lead to an increase in precipitation in the territory and the flow of the right-bank tributaries of the Ertis.
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