Sydney's Warragamba Dam - which reached 95 per cent capacity on Thursday night - is expected to spill on Friday morning for the first time in 14 years, with the weather bureau predicting increased rainfall in the catchment area into Friday.

Western Sydney looks set to escape with just moderate flooding, despite 75 per cent of NSW being either under water or threatened by floodwaters as the state buckles under its heaviest rains since the 1920s.

When the dam spills the water will flood into the already swollen Murrumbidgee, Hawkesbury and Nepean rivers.

http://news.ninemsn.com.au/national/floods/8427874/nsw-properties-evacuated-amid-downpours

Dumb arse uni trained journalists.