At the city of Coba the Maya built dikes around a lake in order to raise its level and make their water supply more reliable.

在科巴市，玛雅人围绕着一个湖泊修建堤坝，以提高水位，使供水更加稳定可靠。

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The working principle and circuit design of the spot executive unit in computer telecontrol system for the production management of city water supply are described.

论述了城市供水生产调度微机远动系统中现场执行端的工作原理和电路设计。

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The article research several aspect about city water supply on fire, build region water supply on fire and pile water supply, then bring forward some opinion.

本文对城市消防供水系统、建筑小区区域消防给水系统以及高层建筑消防给水系统的几个主要方面进行了研究，并提出一些见解。

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No Indian city has a 24-hour domestic water supply, though efforts are under way to provide it in Mysore and a few other places.

ECONOMIST: It must also be clean

And besides, they say, the water from the Colorado River -- the city's main supply -- already has to be treated to remove all types of pollution.

CNN: San Diego hopes to recycle waste water

After a successful three-month pilot program the city now uses the Ferrator to treat its entire water supply, up to 750, 000 gallons a day.

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