水库 Reservoir
（重定向自Resevoir）
水库是指人造的湖泊，而规模较小的则称为水塘、塘坝和蓄水池。一般的形成方法是在河流的中上流建造堤坝，河水把河谷淹没后便形成水库。不过也有的水库是建于海上的，例如香港的船湾淡水湖。水坝一般都建于狭窄的谷地，因为两岸的山坡可以作为水库的天然围墙，而水坝的长度也可大大缩短。兴建之前，将被水淹地带的民居和古迹需要被移到其他地方。
Resevoir
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Reservoir 水库
（重定向自Resevoir）
A reservoir (etymology: from French réservoir a "storehouse" ) is a storage space for fluids. These fluids may be water, hydrocarbons or gas. A reservoir usually means an enlarged natural or artificial lake, storage pond or impoundment created using a dam or lock to store water. Reservoirs can be created by controlling a stream that drains an existing body of water. They can also be constructed in river valleys using a dam. Alternately, a reservoir can be built by excavating flat ground and/or constructing retaining walls and levees.