Fall in India water levels threatens farms -study

(Aug. 14, 2009) Groundwater levels in northern India have fallen about 20 percent more than expected because of excessive pumping, threatening to spark a major food and water crisis, according to a study based on U.S. space agency data. The study, led by Matthew Rodell of NASA's Goddard Space Flight Center in Maryland, said groundwater across three states, including the New Delhi region, dropped at a rate of 4 centimetres per year between Aug. 2002 and Oct. 2008. That depletion is double the capacity of India's largest reservoir and is around 20 percent higher than previous estimates by Indian authorities. More than 110 million people live across the three states, or nearly twice the population of Britain. "If measures are not taken soon to ensure sustainable groundwater usage, the consequences ... may include a reduction of agricultural output and shortages of potable water, leading to extensive socio-economic stresses," the study said. The findings, published in the journal Nature, come as almost a quarter of India faces drought because of failing monsoon rains this year. But the drop reported in the study came in years where there was no shortage of rainfall, so the decline was caused by excessive demand for irrigation and other uses.