Guardian: Australia’s biggest river is running so low that Adelaide, the country’s fifth-largest city, could run out of water in the next two years. The Murray river is part of a network of waterways that irrigates the south-eastern corner of Australia, but after six years of severe drought, the worst dry spell ever, its slow moving waters are now almost stagnant. Water levels in the Murray in the first three months of this year were the lowest on record and the government agency that …