Abstract
This paper presents the results of examinations of snow-rain partitioning and water balance in the Vorskla River basin. Used for calculations have been the results of observations at three hydrological staff gauges and four meteorological stations. A common observation period for each of the characteristics has been the period of 1961-2015. Calculated for each of the hydrological staff gauges have been weight coefficients obtained at the above meteorological stations. The modern period and the period of the climatic norm (1961-1990) has been used for comparison. Сlosure errors of the water balances equation have not exceed 8% of the total precipitation. The air temperature in the Vorskla River basin has increased by 10С compared with the period of the climate norm. Because of this, the snow water equivalent has dropped by 25 mm. In the snow-rain partitioning part of solid precipitation has decreased by 4%. On the average, evapotranspiration has increased by 20 mm. The spring runoff has decreased by 7 mm, while the total amount of dry seasons runoff has increased. On the average, the closure error of the equation has increased by 20 mm due to the influence of outflow components of the water balances. The coefficient aridity and runoff coefficient has varied in two opposite directions. The increase in the coefficient aridity in the Vorskla River basin has been near 0.06 while only about one third of this increase has been offset by a corresponding decrease in the runoff coefficient. This has caused an increase in the closure error due to the outflow part of the equations of water balance. The most rapid reaction to the above changes has been observed in the smallest river basins.
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