1In the first ten days of August, 975, the Hongru River, Shaying River and Tangbai River in the upper reaches of Huaihe River in southwest Henan Province, which are rare in history, experienced torrential rains, flash floods, river overflows and reservoirs burst, resulting in serious disasters.

Flood is a natural phenomenon and a natural disaster, which is caused by natural factors such as rainstorm, rapid melting of ice and snow, storm surge and so on. Objectively speaking, there are irresistible reasons for frequent floods, which can be said to be "destiny". Rainfall depends on the sky, and water diversion depends on people. In a rainy year, whether floods cause disasters and the magnitude of flood disasters are closely related to human factors. Long-term forest destruction is an important reason.