Pakistan flood death toll nears 1500

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Pakistan's unprecedented floods, which have submerged huge swathes of the South Asian nation, have killed nearly 1500 people, data shows, as authorities look to step up relief efforts for millions affected by the disaster.

The floods brought by record monsoon rains and glacial melt in northern mountains have hit 33 million of a population of 220 million, sweeping away homes, transport, crops and livestock in damage estimated at $US30 billion ($A44.5 billion).

The tally of dead stands at 1486, about 530 children among them, the National Disaster Management Authority said, as it released its first countrywide total since September 9, a period that saw 90 more people die.

Over the last few weeks, authorities have thrown up barriers to keep the flood waters out of key structures such as power stations as well as homes, while farmers who stayed to try and save their cattle faced a new threat as fodder began to run out.

The government and the United Nations have blamed climate change for the surging waters, in the wake of record-breaking summer temperatures, that have driven thousands from their homes to live in tents or along highways in the open.

Pakistan received 391mm of rain, or nearly 190 per cent more than the 30-year average, in July and August. That figure climbed to 466 per cent for one of the worst-affected areas, the southern province of Sindh.

Aid flights from the United Arab Emirates and the United States arrived in the country on Thursday, the foreign ministry said. The United Nations is assessing reconstruction needs.