《明史·志·卷四》
二年六月，固原河水上涨，平地水高四尺，百姓和牲畜被淹死。
二年六月，固原河涨，平地水高四尺，人畜溺死。
In June of the second year, the water of the Guyuan River rose, and the water on the flat land was four feet high, drowning people and livestock.