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Water Demand

Water demand is defined as the volume of water requested by natural and human users to satisfy their needs. Water sustains human health, well-being, food production, and economic development. But less than three percent of earth's water is freshwater, out of which nearly 70 percent is stored in glaciers and icebergs, and is not available for direct human use. The freshwater that is available comes from precipitation, surface, or groundwater sources.

Due to rapid population growth, potential water availability worldwide decreased from 12,900 cubic meters per capita per year in 1970 to less than 7,000 cubic meters in 2000. In densely populated parts of Asia, Africa, and central and southern Europe, current per capita water availability is between 1,200 and 5,000 cubic meters per year. The ...

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