Groundwater commonly collects in stream drainages but may remain entirely beneath the surface of dry stream-beds in arid regions.
地下水通常聚集在河流流域，但在干旱地区，地下水也可能完全保留在干涸河床的表面之下。
Wetlands have a big effect on groundwater, the amount of water below the surface of the land.
湿地对地下水，即地表以下的水量影响很大。
Deserts contain large amounts of groundwater when compared to the amounts they hold in surface stores such as lakes and rivers.
与湖泊、河流等地表储存的地下水相比，沙漠中含有大量的地下水。
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。
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。
The impact of rainfall upon the surface water and groundwater resources of the desert is greatly influenced by landforms.
降雨对于沙漠地表水和地下水资源的影响很大程度上取决于地形。
The water is usually naturally occurring groundwater that seeps down along fractures in the rock; less typically, the water is artificially introduced by being pumped down from the surface.
水通常是自然形成的地下水，沿着岩石的裂缝渗出；不那么典型的是，水是通过从地表抽水而人工引入的。
Thus, the most important goal of the exploration program is to identify sites on Mars where groundwater is within practical drilling distance of the surface.
这样，探测工程最重要的目的就是在距离地面的实际钻井距离范围内确定地下水的位置。
That means the drug-tainted wastewater can enter groundwater and surface water, which are collectively the major sources of drinking water for most people.
这就意味着这些被药物污染的废水会进入地表水和地下水，而这正是大部分人饮用水的水源。
Concerns include the degradation of surface and groundwater owing to poultry waste nutrients and pathogenic microorganisms.
令人担忧的问题包括家禽粪便养分和病原微生物造成的地表水和地下水退化。
This study is part of efforts by the U.S. Geological Survey's National Water-Quality Assessment Program to monitor the quality of the nation's groundwater and surface water.
这项科学研究是美国地质调查局国家水质评估项目的一部分，旨在对美国地下和地表水质进行检测。
As most surface water from lakes and rivers in Texas have already been claimed by varying districts across Texas, most counties are now looking at groundwater to meet future demand.
由于德克萨斯州湖泊与河流的大多地表水已被横跨德州的不同区域瓜分，很多郡开始把目光投向地下水以满足未来的需求。
Communities of microorganisms have been found hunkered down in groundwater as far as 5 km below the surface of the land.
地表之下5公里的地下水中也发现了微生物群落。
The hot water from the street runs through them, warming the groundwater, before returning to the surface via another pipe.
之后再通过另一跟导管返回地表进行另一次加热。
Both countries arealready facing severe surface and groundwater shortages (4, 5).
目前，两国都不得不面对地表地下水短缺的严峻形势 【45】 。
Exploitation of groundwater in coastal areas shall undergo scientific demonstration, and measures shall be taken to prevent sinking of land surface and encroachment by seawater.
在沿海地区开采地下水，应当经过科学论证，并采取措施，防止地面沉降和海水入侵。
GSHP can be subdivided into groundwater heat pump (GWHP), ground-coupled heat pump (GCHP), and surface water heat pump (SWHP).
地源热泵系统包括地下水热泵系统、土壤源热泵系统和地表水热泵系统。
The surface may not have been wet for all of that period, notes Dr Grotzinger, but groundwater could have persisted even when the surface was temporarily dry.
在那一时期，火星地表或许不会一直都有水存在，格罗青格博士指出，但会存在地下水，即便地表暂时干涸。
This paper presents a mathematical model which involves only four parameters to simulate the water movement and balance of surface and groundwater in a basin or an irrigation area.
本文提出一个仅含四个参数的数学模型来模拟一个流域或泄区的地面水和地下水的运动及水量平衡情势。
The concentration of nitrate-N increased continuously in soil surface, which resulted in nitrate leaching to groundwater after rewetting.
土表的硝态氮浓度不断增加，烤田增大了复水后硝态氮向地下水淋溶的趋势。
The impacts of climate change, groundwater overdraft, surface runoff and food production changes on water resources are analyzed.
分析了气候变化、地下水超采、地表径流及粮食产量变化等方面对水资源的影响。
The precipitation, surface water resources, groundwater resources, and total volume of water resources were evaluated for Luoyang City.
对洛阳市的降水量、地表水资源量、地下水资源量及水资源总量进行评价。
By analyzing 15 years data about water quality to find the varying tendency of surface water and groundwater in Manasi river valley.
通过对玛纳斯河15年来的水质监测资料的分析、研究，从中寻找出该流域的地表及地下水质变化规律与发展趋势。
Atrazine has a good solubility in soil, so it easily migrates to deep layer or transported to the surface water or groundwater by the river.
阿特拉津具有土壤淋溶性，易被雨水、灌溉水等淋溶至较深层土，或是随地表径流进入地表水和地下水中。
Atrazine has a good solubility in soil, so it easily migrates to deep layer or transported to the surface water or groundwater by the river.
阿特拉津具有土壤淋溶性，易被雨水、灌溉水等淋溶至较深层土，或是随地表径流进入地表水和地下水中。
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