“Right now, Indus is in high flood,” said Aziz Soomro, the supervisor of a barrage that regulates the river’s flow near Sukkur.

Pakistan declares national emergency as floods rage on

The annual monsoon is essential for irrigating crops and replenishing lakes and dams across the Indian subcontinent, but it also brings destruction.

Officials say this year’s monsoon flooding has affected more than 33 million people – one in seven Pakistanis – destroying or badly damaging nearly a million homes.

On Sunday, the country’s National Disaster Management Authority said the death toll from the monsoon rains had reached 1,033, with 119 killed in the previous 24 hours.

It said this year’s floods were comparable to 2010 – the worst on record – when more than 2,000 people died and nearly a fifth of the country was under water.

Thousands of people living near flood-swollen rivers in Pakistan’s north were ordered to evacuate from danger zones, but army helicopters and rescuers are still plucking laggards to safety.

“People were informed around three or four o’clock in the morning to evacuate their houses,” rescuer Umar Rafiq said.

“When the floodwater hit the area we had to rescue children and women.”

Many rivers in the area – a picturesque tourist destination of rugged mountains and valleys – have burst their banks, demolishing scores of buildings including a 150-room hotel that crumbled into a raging torrent.

Guest house owner Nasir Khan, whose business was badly hit by the 2010 flooding, said he had lost everything.

“It has washed away the remaining part of the hotel,” he said.

01:57

Over 800 people killed in Pakistan floods caused by monsoon rains

Over 800 people killed in Pakistan floods caused by monsoon rains

Officials blame the devastation on human-driven climate change, saying Pakistan is unfairly bearing the consequences of irresponsible environmental practices elsewhere in the world.

Pakistan is eighth on NGO Germanwatch’s Global Climate Risk Index, a list of countries deemed most vulnerable to extreme weather caused by climate change.

Exacerbating the situation, corruption, poor planning and the flouting of local regulations mean thousands of buildings have been erected in areas prone to seasonal flooding.

The government has declared an emergency and mobilised the military to deal with what Climate Change Minister Sherry Rehman has called “a catastrophe of epic scale”.

In parts of Sindh, the only dry land are the elevated roads and rail tracks, alongside which tens of thousands of poor rural folk have taken shelter with their livestock.

Near Sukkur, a row of tents stretched for 2km, with people still arriving by boats loaded with wooden charpoy beds and pots and pans – the only possessions they could salvage.

“Water started rising in the river from yesterday, inundating all the villages and forcing us to flee,” labourer Wakeel Ahmed, 22, said.

Barrage supervisor Soomro said every sluice gate was open to deal with a river flow of more than 600,000 cubic metres per second.

The flooding could not come at a worse time for Pakistan, where the economy is in free fall and former prime minister Imran Khan was ousted by a parliamentary vote of no confidence in April.

While the capital Islamabad and adjoining twin garrison city of Rawalpindi have escaped the worst of the flooding, its effects are still being felt.

“Currently supplies are very limited,” said Muhammad Ismail, a produce shopkeeper in Rawalpindi.

“Tomatoes, peas, onions and other vegetables are not available due to the floods,” he said, adding prices were also soaring.