《水经注·卷九》
又东流，有长泉水注入。长泉源出白鹿山东南，潜流地下十三里，又在邓城西北重新流出地面，世人也叫重泉水。
又东，长泉水注之，源出白鹿山东南，伏流径十三里，重源浚发于邓城西北，世亦谓之重泉水也。
It flows east again, and there is Changquan Water flowing into it. Changquan originates from the southeast of Bailu Mountain, and flows underground for 13 miles, and then flows out from the ground again in the northwest of Dengcheng, which is also called Chongquan Water by people.