《水经注·卷六》
往西流过榆次县南边，又往西流到晋阳县南边，榆次县就是旧时的涂水乡，原是晋大夫智徐吾的食邑。
西过榆次县南，又西到晋阳县南，榆次县，故涂水乡，晋大夫智徐吾之邑也。
Flowing west through the south of Yuxi County, then flowing west to the south of Jinyang County, Yuxi County was the old Tusui Township, originally the fiefdom of Zhishiwu, a minister of Jin.