Twelve million are affected in Khyber Pakhtunkhwa and Punjab provinces, while a further two million are affected in Sindh.
In Indian-administered Kashmir, at least 113 people died in mudslides.
Meanwhile, it has emerged that a charity connected to a group with alleged al-Qaeda links has been providing flood relief.
“This will be the biggest disaster in the history of Pakistan” (General Nadeem Ahmed National Disaster Management Authority)
Gen Nadeem Ahmed, of the National Disaster Management Authority (NDMA), said 12 million people had been affected in Khyber Pakhtunkhwa and Punjab provinces, where 650,000 houses were destroyed.
The cost of rebuilding roads there was put at some 5bn Pakistani rupees ($59m, £38m), while the bill for fixing damage to power infrastructure and dams would come to another 2.5bn rupees.
"In my opinion, when assessments are complete, this will be the biggest disaster in the history of Pakistan," the general said in Islamabad.
Anger is growing at the absence of President Asif Ali Zardari, who left the country to visit Britain for talks with Prime Minister David Cameron.
With flood victims bitterly accusing the authorities of failing to come to their aid, the disaster has piled yet more pressure on an administration struggling to contain Taliban violence and an economic crisis.
Flooding has submerged whole villages in the past week, killing at least 1,600 people, according to the UN.
And the worst floods to hit the region in 80 years could get worse, as it is only midway through monsoon season.
According to the federal flood commission, 1.4m acres (557,000 hectares) of crop land has been flooded across the country and more than 10,000 cows have perished.
'Flood peaks'
Along a 1,200km (750-mile) stretch of the River Indus in Sindh province, the government has evacuated one million people and is evacuating another half a million, provincial minister for irrigation Jam Saifullah Dharejo told the BBC.
6 August 2010 Last updated at 15:59 ET
BBC's Adam Mynott: 'It's a catastrophe... and that's no overstatement'
The worst floods in Pakistan's history have hit at least 14 million people, officials say.
About half a million people from the area left their homes earlier to stay with family and friends.
"The flood is at its peak right now, and we expect the waters following to start to recede once these torrents have passed," the minister said.
Pakistan's meteorological department has predicted further downpours for the country, especially in flood-affected areas.
In Kashmir's Ladakh region, mudslides swept through the town of Leh early on Friday, killing at least 113 people and injuring 400, local official T Angchok told the BBC.
The two main roads into the town were closed as was the airport, and medicines, blankets and tents were in short supply.
Controversial charity
In Khyber Pakhtunkhwa, a charity with links to a group blamed for the Mumbai attacks has been providing flood relief, one of its leaders told the BBC.
Zardari responds to criticism over his UK visit during the floods
Falah-e-Insaniat has close links to Jamat ud Dawa, an organisation linked in turn to Lashkar-e-Taiba, which was banned by Pakistan after the 2008 attacks on the Indian city.
The head of Falah-e-Insaniat in Risalpur, Adil Mir, said his volunteers had helped thousands of people.
Jamat ud Dawa came to prominence through its relief work during the 2005 earthquake in Pakistani-administered Kashmir.
The BBC's Adam Mynott says the concern is that while the Pakistan government is being widely condemned for failing flood victims, Falah-e-Insaniat has responded quickly and is recruiting supporters right across the country.
Write a comment
Frontier (Sunday, 08 August 2010 13:36)
At least 1,162,000 cu-secs of flood water is entering in Sind province of Pakistan today (Sunday), I think, its called super flood. It deluged dozens of villages in the Sind.
Authorities have already raced to evacuate people from affective areas. Although, 15 million people are already affected. More than 252,000 homes have been damaged or destroyed across Pakistan and 1.38 million acres of crop land flooded. The flooding has threatened electricity generation plants, forcing units to shut down in a country already suffering a crippling energy crisis.
In Punjab Province, a senior government official said water had entered an oil refinery unit, oil depot and a power generation plant, with workers being forced to leave their homes in the area.
As well as, this is to inform you all that my hometown is also affective due to flood. My hometown is in Punjab province close to Kot Addu city. At least 2000 people were living. All homes have been fallen down there. No fatality is observed. Right now, they all have moved to Muzaffargarh city as well as Multan city.
In the end, you all are requested to please prayer for us, we are suffering difficulties to face this flood.
Thank & Regards,
Frontier.
Roger (Sunday, 08 August 2010 14:49)
My heart goes out to you and your country. I find it unbelievable that all the homes are destroyed in your home town. I have never been through a flood like that - none even close to it.
I hope Pakistan, you, your family, and your hometown people will be taken care of - that those who have lost so much can recover.
Thank you for sharing this with us.
Frontier (Tuesday, 10 August 2010 12:36)
The United Nations said on Monday that Pakistan has massive flood. It has affected 13.8 million people and eclipsed the scale of the devastating 2004 tsunami.
Mr. Maurizio said (A spokesman for the UN office) that “this disaster is worse than the tsunami, the 2005 Pakistan earthquake and the Haiti earthquake”.
He also said the 13.8 million affected people outstripped the more than three million hit by the 2005 earthquake, five million in the tsunami and the three million affected by the Haiti earthquake.
The United Nations estimates 1,600 people have died in Pakistan’s floods. About 220,000 were killed by the December 26, 2004 tsunami in Southeast Asia.
The United Nations estimated that up to 500,000 people are homeless and 1.4 million acres of agricultural land destroyed in central Punjab province, but said damage was worst in the northwestern Khyber Pakhtunkhwa province
Frontier (Thursday, 19 August 2010 09:43)
The devastating floods, which have ravaged large parts of north-western and central Pakistan over the past days, have meanwhile also reached Sindh Province.
“The water levels are very high, and the risk of serious flooding is increasing rapidly”, said Andro Shilakadze, Chief of the United Nations Children’s Fund (UNICEF) Field Office in Sindh.
At least 150,000 people have so far been evacuated by the Provincial Disaster Management Authority (PDMA) from Sindh’s low-lying areas, and over 400 relief points have been established to assist them.
Assessments are underway in Punjab, located in the country’s east, where it is estimated that at least 1.6 million people have been affected. An estimated 84,000 homes have been destroyed, leaving up to 500,000 people homeless in the province. At least 1.4 million acres of agricultural land was destroyed in Punjab alone, where people rely heavily on agriculture for their food supply.
Guys, we need large amount of clean water, food as well as shelters/tents. Some countries are helping us for rehabilitation and relief of floods but this is not enough but they deserve to salute.
I can assume that what do you have to do when people are suffering above type of situation. Come forward and do something for this noble cause.