Water is life’s succor. It is a primary civilizational need. It is a source for drinking, production of food and various commodities, and an essential input in our livelihood. The UN has enshrined it in its Rio declaration (1977) as “Access to water is a human, social, individual and collective right.” Its nonavailability or skewed availability or unreliable water supply system has potential of causing social unrest. India is a monsoon dominated country with an annual rainfall of 4000 BCM considered adequate for all needs of its population, but wide variations in climate, topography, geology and soil lead to its...

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