在调查过去的气候条件时使用的一种非常古老的方法是测量古代湖泊的水位。
One very old method used in the investigation of past climatic conditions involves the measurement of water levels in ancient lakes.
注意“净”这个词：测量渗入湖泊和流出湖泊的地下水的实际数量是一个比仅仅推断它们之间的差异要复杂得多的问题。
Note the word "net": measuring the actual amounts of groundwater seepage into the lake and out of the lake is a much more complicated matter than merely inferring their difference.
测量，分析和维护在江河湖泊，雨水和污水中的水的质量和流动，并调查和绘制海洋，海和河流的地图。
Measures, analyses and maintains the flow and quality of water in rivers, lakes, stormwater and sewage, and surveys and maps oceans, seas and rivers.
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