砂岩通常是良好的含水层，而细粒泥岩通常是不透水的。
Sandstones generally make good aquifers, while finer-grained mudstones are typically impermeable.
若已知存在不透水层，不透水层内的水压力分布规律如何。
If the water-tight stratum had already existed, what the groundwater pressure distribution regular in it.
在基坑底部以下存在承压水层的情况下，基坑开挖减少含水层上覆不透水层的厚度。
When confined aquifer under the bottom of the pit, the foundation excavation will reduce the thickness of overlying impermeable layer.
在此基础上运用统计学方法从三个方面研究土地利用、不透水层、土壤物理特性等流域特性对这17个流量指数的影响。
We used statistical methods to quantify the effects of land use types, impervious surface, and soil physical properties on 17 flow metrics in three aspects.
在此基础上运用统计学方法从三个方面研究土地利用、不透水层、土壤物理特性等流域特性对这17个流量指数的影响。
We used statistical methods to quantify the effects of land use types, impervious surface, and soil physical properties on 17 flow metrics in three aspects.
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