《明史·志·卷六十一》
随后，开关不按时，淤塞一天天加重，开通朱家口引清水灌注其中，祗能通行船只。
既而启闭不时，淤塞日甚，开朱家口引清水灌之，仅通舟。
Later, the gate was not opened on time, and the siltation became more and more serious. The ZhujiaKou was opened to let clear water into it, but only ships could pass through.