Sydney has been deluged by the heaviest November rain it has experienced in decades, causing flash-flooding, traffic chaos and power cuts. The city experienced a heavy rain fall throughout Wednesday and at one point receiving its average monthly rainfall in two hours. Australia's Bureau of Meteorology said it was the region's wettest November day since 1984, with winds of up to 90km/h recorded. The weather played havoc with commuters in Australia's biggest city, with many transport services cancelled or delayed which includes 130 flights at the international airport. Dozens of vehicles…