《后汉书·本纪·肃宗孝章帝纪》
现在将礼拜常山，遂往北土，历魏郡、经平原，升践堤防，询访耆老，都说 ：过去汴渠未修，深的地方成了渊源，浅的地方成了烂泥塘。 
今将礼常山，遂徂北土，历魏郡，经平原，升践堤防，询访耆老，咸曰 往者汴门未作，深者成渊，浅则泥涂 。
Now the emperor is going to offer sacrifices to Changshan and then going north to Wei Commandery and Pingyuan. He climbed up on the dike to look around and asked some of the older local people about the situation there. They all said: "When the Bian Canal had not yet been built, the deep parts had already been filled with water and the shallow parts were covered with mud."