The new study analyzed records from 1910, which confirm the impact of recent
Floods and droughts are extremely expensive and life-threatening events. It is very important that humanity has ways to assess the likelihood of such an event.
According to research work, over the pastthe number of such extreme events has grown over the years. Scientists have combined data on 541 rivers in the United States and Canada in 15 hydrological regions, collected according to seasonal characteristics: frequent or rare floods, tropical storms, rains, melting snow. This grouping made it possible to more identify trends towards various extreme events on an annual and seasonal basis.
According to the research results, in the regionswhich were prone to more frequent floods and droughts, their number has doubled in frequency compared to the period 1950-1969. The increase in flooding occurred despite a decrease in snow cover caused by lower winter temperatures.
While floods were more site-specific, droughts were widespread in the identified regions.
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