Critical slope gradient or slope length is not a constant value, which varies in some ranges and depends on the factors of rainfall, slope type.
临界坡度、临界坡长都不是一个确定的值，但在一定范围内变化，变化范围由降雨、坡面地形等因素决定。
This paper analyzed the start-up mechanism of the incompact substance, and gave out the formula that could be used in computing the critical rainfall value of debris flow in its eruption.
本文从松散物质失稳引发泥石流的机理出发，推导了松散物质失稳时的雨量计算公式，该公式可用于计算不同流域内泥石流沟道的松散物质起动的临界雨量。
The grape's demand for rainfall and lighting hours in its growth period exists critical value.
葡萄生长期对降水量、日照时数需求存在临界值。
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