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。
2
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.
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%.