In India’s ‘Silicon Valley’ tech hub of Bangalore, where gleaming office complexes and apartment blocks have sprouted faster than the plumbing to serve them, only 60% of the water the city needs each day arrives through its water pipes.

Much of the rest is pumped from groundwater wells and delivered to homes and offices by a fleet of private and government tanker trucks that growl through the streets of the city of 12 million.

But Bangalore’s groundwater is running dry. A government think tank last year predicted the city – like others in India, including New Delhi – could run out of usable groundwater as early as 2020 as aquifers deplete.

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