The Queensland city of Maryborough has been inundated with water surging into the CBD through the stormwater drains amid a major flood. Authorities had expected the river to peak in Maryborough above a major flood level of 10.5 metres, impacting about 80 homes on Sunday afternoon, after the remnants of tropical cyclone Seth dumped 600 millimetres on the Wide Bay-Burnett region in two days. A dozen pumps were deployed to drain the city centre, Fraser Coast Mayor George Seymour said in a Facebook post on Sunday night. “We now have 12 pumps, each moving about 120 litres a second. We think the flood has reached the peak,” he said in the post. The levee was protecting Maryborough’s CBD until an underground stormwater valve failed just before 2 p.m., allowing floodwater to surge up through the drains and into the streets. Police and Queensland Fire and Emergency Services issued an urgent …