水的开采取决于含水层的两个性质：孔隙度和渗透性。
Extraction of water depends on two properties of the aquifer: porosity and permeability.
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.
这些含水层在一万多年前就饱和了，现在不再重新补充水分了。
These aquifers became saturated more than 10,000 years ago and are no longer being recharged.
在印度、中国、美国等地，地下含水层被抽离的速度比自然补给还要快。
Groundwater aquifers are being pumped down faster than they are naturally replenished in parts of India, China, the USA and elsewhere.
水在含水层中并不是静止不动的，而是会从泉水中渗出，或渗入其他含水层。
Water does not remain immobile in an aquifer but can seep out at springs or leak into other aquifers.
总之，这些花粉化石，还有含水层和岩画，这三样东西都证明了撒哈拉沙漠曾经比现在绿得多。
Anyway, it's this fossilized pollen along with the aquifers and the rock paintings, these three things are all evidence that the Sahara was once much greener than it is today.
地下含水层位于地下1000到3000英尺之间，这意味着抽水成本很高，还有其他接踵而来的问题。
The aquifers range from 1,000 to 3,000 feet below the ground, which means that pumping will be expensive and there are other concerns.
尽管发达国家的人口、工业产出和经济生产率还在飙升，但人们从含水层、河流和湖泊取水的速度已经放缓。
Although population, industrial output and economic productivity have continued to soar in developed nations, the rate at which people withdraw water from aquifers, rivers and lakes has slowed.
撒哈拉沙漠下面是巨大的含水层，基本上是一片淡水的海洋，那可能是经过岩石层过滤的，已经有一百万年历史。
Beneath the Sahara are huge aquifers, basically a sea of fresh water, that's perhaps a million years old filtered through rock layers.
奥加拉拉含水层是一个砂岩地层，位于从德克萨斯州西北部延伸到南达科他州南部，约583000平方公里土地的地下。
The Ogallala aquifer is a sandstone formation that underlies some 583,000 square kilometers of land extending from northwestern Texas to southern South Dakota.
可以从中抽取水的地下蓄水层被称为含水层。
A groundwater reservoir from which water can be extracted is called an aquifer.
这种情况在德州最为严重，那里气候最干燥，抽水量最大，含水层含水最少。
The situation is most critical in Texas, where the climate is driest, the greatest amount of water is being pumped, and the aquifer contains the least water.
这个含水层被命名为奥加拉拉含水层，以曾经居住在这个地区的奥加拉拉-苏族印第安人的名字命名。
This aquifer was named the Ogallala aquifer after the Ogallala Sioux Indians, who once inhabited the region.
农民们脚下的含水层损耗同样严重。
Just as serious is the depletion of the aquifers on which farmers depend.
非承压含水层是两种主要含水层之一。
One of the two main types of aquifer is the unconfined aquifer.
钻进机据说能钻破岩层进入含水层，但看起来不行。
The machine that promises to break bedrock into the aquifer seemingly can't.
一种可能是由含水层渗透、或地下冰融化造成的。
One possibility is that the seeps are fueled by an aquifer or melting subsurface ice.
含水层的干涸已成为迫在眉睫的危机，新的协议给了我们希望。
Depletion of aquifers is a looming tragedy. New agreements offer hope.
在该州北部的沙岗地区、吕伯的牧场附近，含水层尤其接近地表。
The aquifer rises especially close to the surface in the Sand Hills region in the north of the state, near Mrs Luebbe's ranch.
有时候人们也用自流含水层这一术语表示承压含水层。
Sometime the term artesian is used to denote a confined aquifer .
有时候人们也用自流含水层这一术语表示承压含水层。
Sometime the term artesian is used to denote a confined aquifer.
延迟或少量的季节性降雨将改变水库和含水层注满水的速度。
Late or light rainy seasons will alter the speed at which reservoirs and aquifers refill.
学者们对努比亚砂岩含水层寿命的估计相差悬疏，从一百年到一千年不等。
Estimates for the life of the Nubian sandstone aquifer range from a century to a millennium.
另外，它认为，含水层的水文条件会使任何泄漏的蔓延速度变得十分缓慢。
What is more, the hydrology of the aquifer, it argues, would slow the spread of any leak to a snail's pace.
这项由美国支持的工程每年将把十万吨二氧化碳存储在就近的咸水含水层里。
In a US-backed project, it will store 100, 000 tonnes of carbon dioxide annually in a nearby saline aquifer.
专家们仍然在推敲总数：根据不同的测量方式，美墨边境可能有8、10、18或20处含水层。
Experts are still refining the count: the American-Mexico border may include 8, 10, 18 or 20 aquifers, depending on how you measure them.
在许多国家，由于没有严格限制或执行的条例，人们可以随意从地下含水层中压泵取水。
In many countries people can pump as much water as they like from underground aquifers, because rules are either lax or not enforced.
专家们都赞同气候正在变暖的观点，这意味着春天来自山上可以融化补给河流和含水层的雪变少了。
Experts agree that the climate is generally getting warmer, which means there is less snow on the mountains to melt in the spring, fill the rivers and recharge the aquifers.
专家们都赞同气候正在变暖的观点，这意味着春天来自山上可以融化补给河流和含水层的雪变少了。
Experts agree that the climate is generally getting warmer, which means there is less snow on the mountains to melt in the spring, fill the rivers and recharge the aquifers.
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