《水经注·卷十二》
此水又往东北流，与乐堆泉汇合。乐堆泉发源于乐堆东面，往东南注入琢水。
又东北与乐堆泉合，水出堆东，东南流注于涿水。
The water flows northeast again and converges with Leidui Spring. Leidui Spring originates from the east of Leidui and injects Zhuoshui to the southeast.