Flood is the inundation of an area as a result of rising water levels in rivers, lakes, and seas due to rain. The largest flood occurred in South Central China in 1931. Or as it is also called the Yangtze-Huai River flood of 1931. From 1928 to 1930, China had a period of drought. In the winter of 1930/1931 there was a lot of snow, and in the spring - rains, which led to the overflow of rivers. Due to the duration of rainfall, cyclone activity could be watched. And also, for example, in the Yangtze River, the water rose by 70 centimeters in July alone. By July 1931, the country's largest rivers: the Yangtze, Huaihe and Yellow River overflowed their banks. Soon, high water reached Nanjing, which at that time was the capital of the country, and almost completely destroyed it. By August 19, the water level was 16 meters above normal. So many people lost their homes that more than 60% of the population became refugees. On the evening of August 25, water entered the Grand Canal and washed