The water table is the underground boundary below which all the cracks and pores are filled with water.
地下水位是地层岩石裂缝和孔隙充满水的边界。
Above the water table is the vadose zone, through which rainwater percolates.
地下水位的上方是包气带，雨水从中渗透。
In the northern peninsula the elevation is sufficiently low that the ancient Maya were able to reach the water table at deep sinkholes called cenotes, or at deep caves.
在半岛北部，海拔足够低，因此古玛雅人能够经由被称为竖井的深层排水口或深洞探及地下水位。
If the water table intersect the land surface, groundwater will flow out onto the surface at springs, whether to be collected there or to subsequently flow farther along a drainage.
如果地下水位与地表相交，地下水将在泉水处流出地表，聚集于此或是随后沿着排水系统进一步流动。
Water in the vadose zone drains down to the water table, leaving behind a thin coating of water on mineral grains.
包气带中的水会沉降到地下水位，只在矿物颗粒表面留下一层薄薄的水膜。
Environmentalists say that diverting water from the river will lower the water table and dry out wells.
环保主义者称引流河水将导致地下水位下降和水井干枯。
Excess water from irrigation sinks down into the water table.
灌溉产生的多余水分渗入地下水。
Because the surface of the water table is not flat but instead rises and falls with topography, groundwater is affected by gravity in the same fashion as surface water.
由于地下水位不是平面的，而是随着地形起伏的，所以地下水和地表水一样受到重力的影响。
Below the water table and rock is oil.
地下水和岩石下面是石油。
The water table is not flat but usually follows the contours of the topography.
地下水位是不平坦的，而是通常随地势而变化。
Typically, though, the water table may be tens or hundreds of meters below the surface.
不过一般来讲，地下水位可能会位于地表以下数十或数百米。
If no drainage system exists, the water table rises, bringing dissolved salts to the surface.
如果没有排水系统，地下水位就会上升，把溶解的盐带到地表。
In some cases, the water table reaches Earth's surface, where it is expressed as rivers, lakes and marshes.
在某些情况下，地下水位到达地球表面，在那里以河流、湖泊和沼泽的形式表现出来。
In particularly wet years, short stretches of an otherwise dry stream-bed may have flowing water because the water table rises to intersect the land surface.
在气候特别湿润的年月里，平常干涸的河床下游可能会有水流动，因为地下水在那里位抬升到了地表以上。
In places, the water table is declining at a rate of a meter a year, necessitating the periodic deepening of wells and the use of ever-more-powerful pumps.
在一些地方，水位正以每年一米的速度下降，需要定期加深井并使用更强大的水泵。
This decrease in the water table is a major contributor to land subsidence - New Orleans, like Venice, is sinking.
地下水位的降低则是地表陷没的元凶，而新奥尔良，和威尼斯城一样，正在下陷。
There is also evidence that the water table is declining, forcing farmers to use poorer quality water containing high levels of arsenic.
也有证据显示，地下水位正在下降，逼迫农民们使用更低质量的水，这样的水含砷量较高。
The water table is falling fast in densely populated and poor regions of China, Mexico and India.
在中国、墨西哥和印度人口稠密的贫穷地区，地下水位在急速下降。
Fields become less resistant to water stress and the water table is no longer resupplied by water filtering through, worsening the effects of droughts.
农田的抗水分胁迫能力下降，而且地下水位得不到渗透水的补充，加重了干旱的影响。
As the conservation program has progressed in the village and the water table has risen, this well has also been able to provide irrigation for crops during the dry season.
自从水资源保护项目在村里的开展和地下水位的提升，这口井在旱季也能为作物灌溉提供水源。
Fracking can damage the water table, disrupt communities and even cause earthquakes.
用水力压裂技术采气的过程会破坏地下水位，影响周边环境，甚至引起地震。
A child was at the water table and she was busy sudsing up some soap and stirring with her spoon, and there was a child next to her.
一个小孩在地下水位旁忙着制作起泡沫的浓肥皂水并用勺子搅拌着，在她旁边还有一个小孩。
Rights provide quotas, but Israeli farmers do not want to see them traded-and the water table drops.
产权提供配额，但是以色列的农民不想看到水被交易——更不想看到地下水位下降。
The plan could lessen the reliance on the mammoth pumps that not only remove storm water but also lower the natural water table of the area.
设计还可减轻该地区对众多庞大水泵的依赖，因水泵不仅可以抽掉暴风雨水，却也降低了本地区的地下水位。
The water table is falling. Temperatures rise year by year.
地下水位一直在下降，温度却年年上升。
More than a century of groundwater over-exploitation in Vietnam has drawn the water table down and, with it, arsenic.
在越南长达一个多世纪的地下水过度开采使地下水位下降，与此同时，砷也随之深入。
When the water table is at normal height, the fire dies down when it hits the earth.
当地下水位处于正常高度时，火焰在触及地面时很快就会熄灭。
The World Bank expects Sana, where the water table is falling by six meters (20 feet) a year, to have exhausted its remaining water supply by 2010.
每年萨那的地下水位以六米(二十英尺)的速度下降，世界银行估计至2010年，萨那将耗尽剩余的水源。
Its purpose is not to shield radioactive emissions but to prevent the release of radioactive dust and other materials, and to keep out rainwater, which could carry contaminants into the water table.
它的作用不是用来遮挡放射性排放而是阻止放射性烟尘和其它物质的释放，以及遮挡雨水以防止雨水携带污染物流入地下水。
Its purpose is not to shield radioactive emissions but to prevent the release of radioactive dust and other materials, and to keep out rainwater, which could carry contaminants into the water table.
它的作用不是用来遮挡放射性排放而是阻止放射性烟尘和其它物质的释放，以及遮挡雨水以防止雨水携带污染物流入地下水。
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