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The main reason why the 2010-2011 floods happened in Queensland was, quite simply, because of the unusual amount of rain.

Australia spends many years in drought, often caused by the El Niño effect. When an El Niño occurs, changes in sea surface temperatures cause a shift in air pressure which, in turn, can result in climatic anomalies, such as severe droughts in Australia. These years are punctuated by years of normal rainfall, but occasionally, Australia gets the opposite to an El Niño, which is La Niña. This means that weather conditions, etc, are in reverse to those seen during El Niño, and Australia experiences far more rain than usual.

Australia had been coming out of an El Niño for some time, which means that many parts of Australia had seen gradually increasing rainfall. The rainfall recorded in September 2010 made it Australia's wettest month overall in 110 years. Queensland already experienced flooding in early 2009 (at the same time that southern Australia had the terrible Black Saturday bushfires), and higher than normal rainfall in 2010, increasing towards the end of the year. By then, the ground was simply too saturated to hold any more water. Add to that the effects of the cyclone which crossed the north Queensland coast at Christmas time, bringing excessive rainfall to north and central Queensland, and the ground was waterlogged. (A similar pattern led to the Brisbane floods of 1974.)

Radar images show how large the cyclone system was, even though it was only a category one cyclone, the lowest grade. Low wind speeds do not necessarily mean low rainfall, and in this case the cyclone brought large amounts of rainfall right along the coast. Some of the water runoff from the north flowed down through the inland river system; some of the rainfall fell into the catchment areas of coastal rivers further south. The rivers broke their banks more easily, and there was nowhere for the excess water to go.

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6mo ago

The 2010-11 Queensland floods occurred due to a combination of a La Niña weather pattern, which brought heavy rainfall, and the presence of a deep low-pressure system. These weather conditions resulted in widespread and prolonged rainfall, leading to excessive runoff and subsequent flooding in many parts of Queensland. Additionally, inadequate infrastructure and land management practices worsened the impact of the floods.

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Q: Why did the 2010 11 Queensland floods happen?
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When did the 2010-2011 floods happen in Queensland?

The floods which affected Queensland in the summer of 2010-2011 began in some parts of the state as early as December 10. With many properties already under threat, conditions worsened considerably when a widespread cyclone system hit northern Queensland on Christmas Day, dumping huge amounts of rainfall right across the state.The floods really began to be felt just after Christmas as major centres like Rockhampton and Bundaberg were inundated. The floods then hit many other towns, until finally on 11 January, the Brisbane River actually began to break its banks.


The Queensland floods have been the worst floods in Queensland since?

The current floods in Brisbane (May 2009) have been the worst since the floods in 1974. By the time the 1974 floods abated, four days after they set in, 16 people had died, 300 had been injured, and 9,000 people left homeless. Total cost of the damage, in 1974 values, was $200 million. Since the above was written, there have been more, major floods. Commencing in central Queensland around 10 December 2010, massive floods have moved across Queensland, inundating major centres such as Rockhampton, Emerald and Warwick, and many smaller towns such Mundubbera, St George, Theodore and Condamine in the worst known floods on record. River levels are not expected to go down until mid-January. On 11 January 2011, the Brisbane River broke its banks, with expectation that it will cause the worst floods in history, in terms of damage.


When did the flooding in Queensland start?

The floods affecting Australia this summer (2010-2011) began in parts of Queensland as early as December 10. With many properties already under threat, conditions worsened considerably when a widespread cyclone system hit northern Queensland on Christmas Day, dumping huge amounts of rainfall right across the state.The floods really began to be felt just after Christmas as major centres like Rockhampton and Bundaberg were inundated. The floods then hit many other towns, until finally on 11 January, the Brisbane River actually began to break its banks.


When did the Australian floods occur?

The floods affecting Australia this summer (2010-2011) began in parts of Queensland as early as December 10. With many properties already under threat, conditions worsened considerably when a widespread cyclone system hit northern Queensland on Christmas Day, dumping huge amounts of rainfall right across the state.The floods really began to be felt just after Christmas as major centres like Rockhampton and Bundaberg were inundated. The floods then hit many other towns, until finally on 11 January, the Brisbane River actually began to break its banks.With the continuation of an unusually heavy rainfall pattern, courtesy of La Nina, there is no immediate end in sight. Cyclones have continued to dog the Queensland coast, bringing flooding rains with them.


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The floods which affected Australia in the summer of 2010-2011 began in parts of Queensland as early as December 10. With many properties already under threat, conditions worsened considerably when a widespread cyclone system hit northern Queensland on Christmas Day, dumping huge amounts of rainfall right across the state.The floods really began to be felt just after Christmas as major centres like Rockhampton and Bundaberg were inundated. The floods then hit many other towns, until finally on 11 January, the Brisbane River actually began to break its banks.


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