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It depends on the size of the dam. The biggest dam is in China. It is the Three Gorges Dam. It is so big that when it is filled, it will change the weight differential of the Earth's orbit (a wee little bit).

If you could shrink down the Earth's water into a gallon jug, only one tablespoon of it would be available for all humans to drink.

The biggest supplier of fresh water to drink is the rain water from ocean evaporation. The cycle of recycling rain water through the evaporation of ocean salt water is nature's way of keeping us supplied.

Water is the magic liquid.

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14y ago

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