People walk on the flooded bank of the Rhine river in Cologne, Germany, Feb. 2, 2021. (Photo by Tang Ying/Xinhua)

The banks of the Rhine river are seen flooded due to continuous rainfalls in Cologne, Germany, Feb. 2, 2021. (Photo by Tang Ying/Xinhua)

The banks of the Rhine river are seen flooded due to continuous rainfalls in Cologne, Germany, Feb. 2, 2021. (Photo by Tang Ying/Xinhua)

The banks of the Rhine river are seen flooded due to continuous rainfalls in Cologne, Germany, Feb. 2, 2021. (Photo by Tang Ying/Xinhua)

A barricade is placed after the banks of the Rhine river were flooded due to continuous rainfalls in Cologne, Germany, Feb. 2, 2021. (Photo by Tang Ying/Xinhua)

The banks of the Rhine river are seen flooded due to continuous rainfalls in Cologne, Germany, Feb. 2, 2021. (Photo by Tang Ying/Xinhua)

A barricade is placed after the banks of the Rhine river were flooded due to continuous rainfalls in Cologne, Germany, Feb. 2, 2021. (Photo by Tang Ying/Xinhua)

People are seen at the flooded bank of the Rhine river in Cologne, Germany, Feb. 2, 2021. (Photo by Tang Ying/Xinhua)

The banks of the Rhine river are seen flooded due to continuous rainfalls in Cologne, Germany, Feb. 2, 2021. (Photo by Tang Ying/Xinhua)

Children's public fitness facilities are flooded at the bank of the Rhine river due to continuous rainfalls in Cologne, Germany, Feb. 2, 2021. (Photo by Tang Ying/Xinhua)