《水经注·卷三十》
塘水散流，往下与慎水汇合，然后往东南流经息城北边，又往东南注入淮水，汇流处叫慎口。
肢水散流，下合慎水，而东南径息城北，又东南入淮。谓之慎口。
The pond water flowed out, joined with the Shen River, and flowed to the southeast, passing the north of Xicheng, then continued to flow southeast to the Huai River. Their confluence was called Shenkou.