What is the biggest flood in the history of China?

From August 5 to 7, 1975, a rare torrential rain occurred in Zhumadian, south-central Henan Province. 3-day total precipitation 1605mm, 24-hour maximum precipitation 1054.7mm and 0-hour maximum precipitation 189.5mm in the rainstorm center. ..

Among them, 1-6 hours of rainstorm set a historical record in China. The "July 8" rainstorm caused two large reservoirs and several small and medium-sized reservoirs to burst almost at the same time, and the flood spread rapidly, which may be the heaviest rainstorm that caused people's lives and property losses in China after liberation.

The rainstorm lasted all night, which led to a great increase in the storage capacity of the reservoir. Finally, the dam was washed away by the river, and the water suddenly passed. Pour down.

According to the records, the maximum instantaneous flow at the time of breach was 7.8 1 10,000 cubic meters per second, and 7.0 1 10,000 cubic meters of flood was poured downstream within 6 hours. After the dam-break flood enters the river, it rushes downstream at an average speed of 6 meters per second, forming a water flow with a head as high as 5- 9 meters and a width of 12- 15 kilometers between the dam and the Beijing-Guangzhou railway.

The flood caused10,000,000 people to be affected and more than 20,000 people died. Zhumadian has become the sea of Wang Yang, with economic losses as high as nearly 10 billion yuan. More than 60 reservoirs burst their banks, which is the most serious tragedy in the world.