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Heavy rainfall has been forecast for some parts of NSW, as Warragamba Dam nears capacity.

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Warragamba Dam has spilled after reaching capacity in Sydney as the flood clean-up continues across large parts of NSW. Aerial images show the extent of damage in some towns. Follow live updates here.

Warragamba Dam is set to spill over this afternoon after days of torrential rain. Water NSW says the outflow could be around 20 gigalitres per day by Sunday morning.

Warragamba Dam has spilled in Sydney as the flood clean up got underway in other parts of the state.

Sydneysiders are being warned to remain alert as Warragamba Dam nears capacity, after earlier fears the dam would spill following relentless rains.

Sydneysiders are being warned to remain alert as Warragamba Dam nears capacity, after earlier fears the dam would spill following relentless rains.