"Urbanization is a reality of our changing world. In developing countries, the lack of job opportunities in rural areas, decline in subsistence economies, and hope of a better life have given rise to the modern megalopolis. Unfortunately, urban infrastructure, institutions, and the natural resources base are often inadequate to support these burgeoning populations. A central question worldwide is, "how can our cities be sustained under these circumstances?" Water, like air is a vital resource without substitute. Its supply allocation, and disposal present numerous challenges, all of which must be met to support these growing metropolitan regions."
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