《水经注·卷三十一》
郭仲产说：破塘在比阳县以西五十里，占地百顷，周围受到灌溉的田亩达万顷，按年轮种，境内没有荒年。
郭仲产曰：肢在比阳县西五十里，盖地百顷，其所周溉田万顷，随年变种，境无俭岁。
Guo Zhongchan said: The broken pond is fifty miles west of Biyang County, covers an area of one hundred qing, and irrigates ten thousand qing of farmland around it, meaning that the area never suffers from famine based on the annual crop rotation.