On this day, 78 years ago, on March 15, 1947 (February 23, 1947, the Huayuankou Dam was closed and the Yellow River water returned to its old path. In the early morning of March 15, 1947, Huayuankou Dam was closed, and the Yellow River water returned to its old path. In October 1946, the Huayuankou closure project resumed again. In December, the diversion river was dug and riprap began, and part of the Yellow River water flowed back. The Communist Party of China protested against this and demanded that the closure release be postponed, but the Kuomintang ignored it. In January 1947, the Kuomintang and the Communist Party held many talks but no agreement was reached. The Huayuankou closure project failed again on January 15 due to a sudden increase in water flow. On February 7, Dong Biwu, a representative of the Communist Party of China, held talks with Huo Baoshu, the new director of the "Rescue Bureau" of the Executive Yuan, and officials of the United Nations "Rescue Bureau" in Shanghai and reached an agreement: the embankment restoration project in the Jiefang District will start immediately, the blockage will continue as usual, and the closure date will be determined according to the situation. Since then, the closure project has been accelerated. At the beginning of this month, the Xinyin River was completed and discharged. The third riprap began on the 11th and was completed on the 15th.