By thinking of the geo-environment problems caused by the decrease of water level, inthe future the extraction rate of groundwater source plants should be reduced by at least30% of the rate in 2000.
考虑到不至于由于地下水位下降而引发各种环境地质问题，北京主要地下水供水源地今后应至少降低2000 年开采量的30%进行地下水开采。
The decrease of precipitation and surface water and over-exploitation are the main reasons that result in groundwater level decline.
降水和地表径流的减少以及地下水的严重超采是引起地下水位下降的主要原因。
The falling of bog water level caused by raining decrease would strengthen the CH4 oxidation by bog soil in Zoige Plateau, thus the CH4emissions from bog decreased.
降水减少导致的沼泽水位下降将加强若尔盖高原沼泽土壤氧化ch4从而减少沼泽ch 4排放。
The echometer was used to monitor the change of the annular water level in the coal- bed methane(CBM)wells production, which could decrease pressure stably and continuously.
在煤层气井排采过程中，通常用回声仪来监测环空液面变化，通过控制液面下降速度来实现稳定、连续降压。
It is pointed out that the worsening of soil moisture states inthe level terraced fields cover two parts, i. e. the decrease in soil moisture storage rate, and increase in crop water requirement;
指出，水平梯田水分状况的恶化包括蓄墒率的减小和作物需水量的增大两部分；
Rising and falling of flood water level not only leads to the increase and decrease of underground water near the bank, but also restricts the change of runoff outflow routing.
洪水的涨落不仅引起河岸附近地下水蓄水量的增减，同时也制约着地下径流过程的变化。
However, it is inevitable to decrease the groundwater level around the mining area and even to influence the water supply safety of the constructed groundwater source fields.
为保证矿区安全开采，采矿本身要求排出大量的矿井水，这不可避免地使附近的地下水水位下降，并可能影响到已有地下水水源地的供水安全，产生供、排水矛盾。
Ways used to decrease underground water level at present have different results on different soil texture.
目前常用的几种降水方法，对不同土质有着不同的效果。
Ways used to decrease underground water level at present have different results on different soil texture.
目前常用的几种降水方法，对不同土质有着不同的效果。
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