Following are some of the key findings of the study, concerning New Delhi:

* The capital's current water requirement is 4,275 million litres a day;

* Supplies add up to 3,375 million litres a day;

* The deficit is estimated at 1,103 million litres a day by 2021;

* Forty percent of the capital's water is lost in distribution;

* Twenty-three per cent of water sold is not metered;

* Fifty-six percent of Delhi Jal Board water does not fetch revenue;

* Revenue loss to Delhi Jal Board due to non-billing is Rs.19.91 billion;

* A fourth of Delhi's households rely on groundwater;

* Around 78 per cent of groundwater wells are overexploited;

* Groundwater levels in the capital are dropping by 10 metres each year;

* Some 230 million gallons of water extracted from Yamuna every day;

* Some 950 million gallons of waste poured into Yamuna daily;

* Filth level in Yamuna 100,000 times above safe limit for bathing;

* Bulk of 611 mm of rainwater received in 27 days;

* Per capita consumption of water estimated at 274 litres;

* Domestic sector accounts for 172 litres per capita;

* Commercial sector accounts for 47 litres per capita;

* Floating population and hotels account for 52 litres per capita; and

* Fire protection accounts for 3 litres per capita.