Days B water color blue, clarify, by atmospheric precipitation and underground water supply, water level fluctuations.

天B池水色碧蓝，澄清，靠大气降水和地下水补给，水位变化小。

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This paper introduces the necessity and importance of final survey of underground water supply line, expounds the contents of and methods for the surveying, and advances some suggestions.

介绍了城市地下给水管线竣工测量工作的必要性和重要性，阐述了测量的内容及施测方法，提出了一些建议。

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Natural replenishment of this vast supply of underground water occurs very slowly.

靠自然补充大量地下水是十分缓慢的。

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However, this year the Namibian department of water affairs announced the discovery of a significant body of underground water - an aquifer dubbed Ohangwena II - that scientists say could supply the north of the country with enough water for centuries.

CNN: Namibia country profile: moving on from a difficult past

But Mr Cheney said it was underground water that mattered most for long-term supply.

BBC: Jersey water boss wants water behaviour change

Other solutions are more complex, but still cheap, such as injecting a sugary mixture into a water supply contaminated by hexavalent chromium to make it less toxic and less mobile underground.

FORBES: The World's Most Polluted Places