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Why do many Siberian rivers flood during spring?

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A map of the continent of Asia, including its countries, boundaries, and capital cities, as well as parts of Europe, Africa, and surrounding oceans. — Asia Map showing the countries and national capitals of Asia.

Siberian rivers frequently experience widespread flooding during the spring due to a combination of seasonal snowmelt and the unique hydrological characteristics of northward-flowing rivers.12

As temperatures rise in the spring, the melting of extensive snow cover significantly increases the volume of water flowing into river systems. Because many Siberian rivers flow northward toward the Arctic Ocean, the upstream sections—which are located in warmer, more southerly regions—thaw and begin to flow while the downstream sections remain frozen and stable.3142

This creates a dangerous scenario where moving water and ice from the south encounter the still-intact ice cover in the north. This blockage often results in the formation of ice jams, which act as temporary dams. These jams obstruct the drainage of the increased spring runoff, causing water levels to rise rapidly and flood the surrounding areas. These spring breakup jams are typically more destructive than those occurring during the initial freeze-up because of the larger quantities of ice involved.243