The Authorities expect the water to drop quite fast

Brisbane residents can expect to see a significant drop in the flood level when they wake on Friday morning.

Manager of the Bureau of Meteorology's Flood Warning Service, Peter Baddiley, said the Brisbane River had been slowly falling since reaching a peak of 4.46 metres early Thursday morning.

'For residents affected by the flood, they will notice a significant fall when they see the river in daylight,' Mr Baddiley said.