Signboards in a flooded park along the overflowing Nepean river in Sydney's Penrith suburb on Sunday. AFP
Heavy rains along Australia's east coast over the weekend have brought the worst flooding in half a century in some areas.
Emergency services ordered people living in low-lying areas on the city's north-western fringes to flee to safety, as authorities warned of a potentially "life-threatening" situation in New South Wales state, according to AFP.
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Sydney braced for its worst flooding in decades on Sunday after record rainfall caused its largest dam to overflow and as deluges prompted mandatory mass evacuation orders along Australia's east coast.
Volunteers of the State Emergency Service patrol a bridge on a swollen river near Warragamba Dam in Sydney. AFP
New South Wales Premier Gladys Berejiklian said the downpour across the state, Australia's most populous with 8 million people, was worse than initially expected, especially for low-lying areas in Sydney's northwest.
"Yesterday, we were hoping it will only be a one-in-20-year event, now it looks like a one-in-50-year event," Berejiklian said at a televised briefing.
It came after the Warragamba Dam, which provides much of the drinking water for Sydney, spilled over on Saturday afternoon – causing officials to warn the downstream Hawkesbury River was expected to peak at levels not seen since 1961.
"It is one of the biggest floods we are likely to see for a very long time," Bureau of Meteorology flood operations manager Justin Robinson said.
Floodwaters had already risen in several areas, prompting mass evacuations, and officials said another 4,000 people could be told to leave their homes in the coming days.
A man wades through floodwaters on a residential street near the swollen Nepean River in Sydney, Australia. Reuters
Authorities urged residents to heed the "dozens" of official warnings in place across affected areas, with State Emergency Service assistant commissioner Dean Storey saying those in evacuation zones "must leave immediately".
People had already begun flocking to evacuation centres in towns north of Sydney on Saturday as torrential rains pummelled a vast coastal region already soaked by an unusually wet summer.
State Premier Gladys Berejiklian said the region was experiencing a "one in 100 year event" and a national disaster had been declared.
In Taree, where television images showed one house floating down a bloated river, about 150 people slept in a local auditorium overnight that has previously been used as a refuge for people fleeing bushfires.
Club Taree chief executive Paul Allen described the floods as a "catastrophe", telling public broadcaster ABC that some locals had "lost everything".
The Bureau of Meteorology said the wild weather was forecast to re-intensify north of Sydney on Monday before easing later in the week.
Motorists commute along a flooded road near Warragamba Dam in Sydney on Sunday. AFP
Conditions were "going to be treacherous yet again," senior climatologist Agata Imielska said.
Rainfall records were forecast to continue tumbling in the coming days, she added.
Emergency services reported receiving more than 7,000 calls for help and carrying out about 650 flood rescues since Thursday, with reinforcements being called in from other states.
The rain and floods were also expected to delay the already halting rollout of coronavirus vaccines in Sydney and surrounding areas.Australia is due to begin the first major public phase of vaccine distribution on Monday although the programme has slipped behind the government's announced timetable due to supply and delivery issues.
Prime Minister Scott Morrison told Parliament that 35 communities in northern New South Wales had been isolated and emergency services had conducted more than 700 flood rescues.
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A man swept away by floodwaters in the city's northwest was rescued by emergency crews, media reported, while television footage showed vehicles struggling to cross waterlogged streets, fallen power lines and trees, and debris floating in rivers.
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