Williamtown has broken another monthly rain record, its third in less than a year.
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The RAAF base weather station had recorded 403.8 millimetres of rain this month by Monday afternoon, eclipsing the March record of 398.5mm set in 1963.
Williamtown also set records in October (252mm) and July (242.6mm) and has soaked up more than 900mm, almost a metre, of rain in the past four months.
The RAAF closed the defence and commercial airport on Sunday evening until midday on Wednesday, but it could open earlier if the weather improves.
RAAF engineers have been inspecting the runway for signs of water damage.
Meanwhile, dozens of residents in the Belmont area have reported sewage bubbling up in their back yards and toilets and sinks blocked or overflowing.
Taryn Shearer, who lives in Northcote Avenue, Swansea, said raw sewage had overflowed from two inspection pipes in her yard on Thursday and Saturday, flooding her shed.
"There was toilet paper and poo. You could see it coming out," she said.
"I think the drainage in the whole area is pretty average and quite old."
Ms Shearer said nearby St Patrick's Primary School had been forced to close on Friday because students could not flush the toilets.
Belmont, Swansea, Marks Point, Pelican and Blacksmiths residents complained of plumbing problems on a Facebook community page.
"It's lapping up under my floor. I haven't had power since 7am, no toilet or shower and sewerage in yard!" one resident wrote.
"Docker st marks point toilets won't drain. 5 year old son didn't get the memo... god help me," another wrote.
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A Lake Macquarie City Council spokesperson said its drainage network had "performed reasonably well" and staff had "worked tirelessly to ensure pits and pipes are free of blockages throughout the [rain] event".
"There are more than 7500 homes in low-lying lakeside suburbs that may be affected in a serious flood, such as the current flood event.
"Many flat low-lying foreshore areas are poorly drained, and heavy rain can cause localised nuisance flooding as stormwater pipes and gutters back up and overflow."
In the Newcastle local government area, the council has asked Hunter Water to address a sewerage port surge which has been spewing sewage in Civic Park.
The affected area has been barricaded with temporary fencing.
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