The square ratio method and basin precipitation method are commended for annual runoff calculation.
在年径流计算中，建议采用面积比法和流域雨量法。
Continuously readjusting the grade limit value(classical domain and joint domain) of every factor can maximize the ratio of historical runoff to actual runoff production in a drainage basin.
通过反复调整各因子的等级分界值（经典域和节域），可以使流域产流计算等级和实际等级的拟合率达到最大，其结果比较好。
The average contributive ratio affecting soil erosion by human activities is 65.6%, and at the same period the contributive ratio by runoff and rainfall is 34.4%.
通过数学模型定量的计算了大沙河流域人类活动对泥沙输移减少的贡献率平均为65.6%，而同期径流和降雨对泥沙减少的贡献率平均则为34.4%。
During the runoff, the number ratio of small particles is gradually increased.
随着径流过程中的进行，径流中小颗粒数目比例会逐渐上升。
During the runoff, the number ratio of small particles is gradually increased.
随着径流过程中的进行，径流中小颗粒数目比例会逐渐上升。
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