《水经注·卷九》
苑水上流在元甫城西北承接淇水，从石堰东边，苑城西边，转弯流过城南，又往东南流过土军东北，有石头砌的旧水沟。
菀水上承淇水于元甫城西北，自石堰东、菀城西，屈径其城南，又东南流历土军东北，得旧石逗。
The upper reaches of the Yuan River receive water from the Qi River northwest of Yuanfu City, turn and flow past the west side of Yuancheng east of the stone weir, past the south of the city, and then southeast past the northeast of Tu Jun, where there is an old stone-built watercourse.