《北史·本记·卷十一》
初四，在三原开渠引杜阳水。夏四月初四，任命宁州刺史窦荣定为左武侯大将军。
戊申，开渠引柱阳水于三畤原。夏四月丁丑，以宁州刺史窦荣定为左武候大将军。
On the fourth day, a canal was opened in Sanyuan to divert water from the Duyang. On the fourth day of the fourth month of summer, Dou Rongding, the governor of Ningzhou, was appointed general of the Left Wuhou.