On this day, 92 years ago, August 25, 1933 (July 5, 1933, the 7.5 earthquake in Diexi, Sichuan Province blocked the lake. On August 25, 1933, a 7.5 earthquake occurred in Diexi City, Mao County, the upper reaches of the Minjiang River in northern Sichuan, killing more than 6800 people. At the same time, collapses and landslides occurred in Diexi, Daqiao and Yinping Cliff, blocking water to form three major "barrier lakes". 45 days after the earthquake (that is, December 9), the river water suddenly rose, and the Diexi Weir burst due to overflowing. The flood reached 200 feet above Dading, which was as powerful as a building, sweeping away most villages and towns in Mao County, Wenchuan, and Guan County along the coast. The famous Dujiangyan Water Conservancy Project was also looted. According to incomplete statistics, secondary floods claimed more than 2500 lives."The essence of the upper reaches of the Minjiang River was lost here."