The natives tried to dredge the south flow of Zhanghe River, but they couldn't go downstream and were drowned. Yu Nai changed the canal to the east and began to pass. Chisel marks still exist today. "There is Dayu Spring in the south of Sanchi, Lucheng County," Lu 'an Prefecture Records Volume 4 ":"It is said that Dayu passed through this place and the ground crossed the well to get the spring. "Yucheng Dayu Mountain, according to legend, Dayu flood control once stayed here because of its famous mountains; There are holes in the mountainside, and there are three stone temples on the top of the mountain. " "Official Records of Lu 'an" Volume 4: "Dayu Mountain is ten miles south of (Lucheng) County, with a height of 893 feet. It connects Lushan Mountain in the north, Baigushan Mountain in Changzhi in the south and builds a temple on it." "Zezhou County Records, Historical Sites, 13 Volumes, Fengtai County Records": "In the north of Taihang Mountain, there is Longmen Gorge twenty-five miles southeast of Iraq (now Jincheng City), which is said to be carved by danger and the land where Gaidan water comes from". Cuozhigou is located in Aozhi Village, Pingshun County, Changzhi City, Shanxi Province. According to legend, it is the site of Dayu's water control.