《论衡·卷十三·效力篇》
如果河岸狭窄地势较高，河水会倒灌支流，造成决口泛滥，漫流在空旷荒凉的地方。
如岸狭地仰，沟洫决泆，散在丘墟矣。
If the river bank is narrow and the terrain is high, the river water will flood the tributaries, resulting in a breach of the embankment and flooding, and overflowing in the open and desolate places.