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张家口市水保试验站坡长小区五年观测资料表明，降雨强度影响径流量、侵蚀量随坡长的变化。降雨强度较小时，径流量不能用坡长与降雨强度的乘积代替，侵蚀量随坡长增加较慢。降雨强度较大时，径流量可用坡长与降雨强度的乘积代替，侵蚀量方程中坡长指数较大。
Five-year observation data of the slope long plot of Zhangjiakou Water Conservation Experimental Station shows that the rainfall intensity affects the variation of runoff and erosion with the slope length. When the rainfall intensity is small, the runoff can not be replaced by the product of slope length and rainfall intensity, and the erosion amount increases slowly with slope length. When the rainfall intensity is larger, the runoff can be replaced by the product of slope length and rainfall intensity, and the slope length index is larger in the erosion equation.