Serbia  May 2014 Extensive Flooding The May 2014 extensive flooding in Serbia was the most severe natural disaster in the country's recorded history, triggered by the low-pressure system "Tamara" that dumped three months' worth of rain in just three days. The unprecedented rainfall caused major rivers like the Sava, Kolubara, and Drina to burst their banks, resulting in widespread flash floods, over 2,000 landslides, and a nationwide state of emergency.