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Military aircraft dropped supplies to towns cut off by floods in northeastern Australia as the prime minister promised new assistance Friday to the 200,000 people affected by waters covering an area larger than France and Germany combined.

Residents were stocking up on food or evacuating their homes as rising rivers inundated or isolated 22 towns in the state of Queensland.

Prime Minister Julia Gillard toured an evacuation centre in the flood-stricken town of Bundaberg on Friday and announced that families whose homes had been flooded or damaged would be eligible for disaster relief payments of $1,000 per adult and $400 per child.

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An aerial view shows properties and houses inundated by flood waters in the Queensland town of Emerald on Friday. ((Jono Searle/Reuters))

"My concern is for the people in these very difficult times," Gillard said.

A day earlier, she pledged $1 million in federal aid to match a relief fund already set up by the state government.

Bundaberg resident Sandy Kiddle told Gillard she lost cherished items after flood waters surged through her house. She said may not be able to return home for a week.

"It was just a sea of water, and I thought the beach would never come to our house," she told Gillard, who gave her a hug.

Officials say half of Queensland's 1,852,642 square kilometres has been affected by the relentless flooding, which began last week after days of pounding rain caused swollen rivers to overflow. The flood zone covers an area larger than the state of Texas.

While the rain has stopped, the rivers are still surging to new heights and overflowing into low-lying towns as the water makes its way toward the sea.

The muddy water inundating thousands of homes and businesses has led to a shortage of drinking water and raised fears of mosquito-borne disease.

"This is without a doubt a tragedy on an unprecedented scale," Queensland Premier Anna Bligh told the Australian Broadcasting Corp.

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Jim Casey and wife Lesley fish from their house, which was surrounded by flood waters in Chinchilla, Queensland, on Tuesday. ((Jeff Camden/Pool/Reuters))

Bligh warned that drenched communities could be stuck underwater for more than a week, and cleanup efforts were expected to cost billions of dollars.

The Department of Community Safety said supplies of food and bedding were delivered by road and by military aircraft Friday to the towns of Rockhampton, Emerald, Springsure and Blackwater in central-east Queensland.

Northeastern Australia often sees heavy rains and flooding during the summer, but the scope of the damage from the recent downpours is unusual.

The entire population of two towns has already been forced to evacuate as water swamped their communities, cutting off roads and devastating crops. The next city in the water's path — Rockhampton, near the coast — is bracing for flood levels forecast at 9.4 metres by Monday or Tuesday.

Roads and railway lines were expected to be cut off by Saturday, and the city's airport planned to shut down over the weekend.

"This is a very serious situation," said Rockhampton Mayor Brad Carter, saying that level would affect up to 40 per cent of the city. "Police are ordering people in affected areas to leave their homes."

Officials were evacuating residents on Friday, starting with the elderly and those living in low-lying areas.

There were concerns over food supplies in the city, with many stores already sold out of bread, milk and fresh meat, Carter said.

Gary Boyer, regional manager of supermarket chain Woolworths, said the company was sending 43 trucks full of supplies into Rockhampton on Friday.

Thousands of people have been evacuated from their homes this week. In the central Queensland town of Emerald, about 1,000 people were evacuated in the last 24 hours.

The town was facing food shortages, power outages and sewage-contaminated flood waters, county mayor Peter Maguire said. Three evacuation centres have been set up to help displaced residents.