Water balance shows the difference between rainfall amount and the potential evapotranspiration intensity. Positive balance means predominant rainfall and water surplus. Negative balance in contrast means predominant evaporation and water insufficiency.
Water balance shows the difference between rainfall amount and the potential evapotranspiration intensity. Positive balance means predominant rainfall and water surplus. Negative balance in contrast means predominant evaporation and water insufficiency. Two smaller maps show total water balance for two 30-year periods. It can be seen that the period 1991-2020 has a lower value of water balance, i.e. less water available in landscape. Difference between the two maps in the top right corner is represented by the large map, where areas with lower water balance represented by hues of red color dominate. In long term, the most negative water balance is observed in south Moravia and to certain extent also central Bohemia and parts of Ústecký region. However, the largest decrease can be seen in Pardubický and Královéhradecký region and partially also central Bohemia and Olomoucký region. Higher water balance in 1991-2020 compared to 1961-1990 is mostly seen only in mountain regions.
Total average water balance for the individual years is shown in the bar chart in the top left and average water balance for the individual decades is shown on the bar chart below. One can see a clear decreasing trend and the last decade (2011-2020) is the only one with a negative total average water balance, primarily due to the very dry years 2015, 2018 and 2019.
Ústav výzkumu globální změny AV ČR v.v.i.
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