We are currently using fresh water at a rate beyond that at which it is being produced. This is only possible as we are draining fossil water aquifers to make up the difference. The scale of this problem is being masked by a one-time increase in glacial flows into the rivers whose basins’ provide the food for a large chunk of the worlds populations. These include the Mekong, Ganges, Yellow, Yangtze and Brahmaputra all of whom rely on the Himalaya/Tibetan Plateau for seasonal stabilisation. Current estimates put China’s 2030 water need at 25% above supply (and 20% is so polluted it not even suitable for agricultural use) and for India this becomes 50% and India is already very reliant on its non renewable aquifers.

Also for further reading you could try
Charting our water future (A McKinsey Institute report on water to 2030 with some solutions) http://www.mckinsey.com/App_Media/Re...Report_001.pdf