水力坡度，又称比降，是油气收集与储运工程方面的一个名词。它是指河流水面单位距离的落差。常用百分比、千分比等比率表示。
给出了管输效率与流量、水力坡降与流量的关系曲线。
The relations of pipeline efficiency versus flowrate and that of hydraulic slope versus flowrate are drawn.
当铺盖长度达到一定值时，水力坡降稳定且渗流量的变化也不明显。
If the blanket length reaches certain value, its hydraulic gradient is steady and the variety of seepage discharge also not obvious.
根据现行计算方法，堤坝下游坡脚处渗流水力坡降具有奇异性，这给工程设计中判别渗透安全性带来困难，同时与实际情况也不符合。
The singularity of hydraulic gradient, which is always found in the calculation of seepage at the toe of dam, is not accord with the reality and makes the trouble in judging the safety of the dam.
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