A breach occurred naturally in Main Nara Valley Drain (MNVD), commonly known as Right Bank Outfall Drain-I, at RD-10 upstream Manchhar Lake on Tuesday that is expected to lower the water level in the country's largest lake, officials said.

Water and Power Development Authority Chief Engineer (water) in Sukkur Naeem Qadir Mangi confirmed the development, explaining that an "afflux" had been created as Manchhar had not been receiving water from MNVD for the last couple of days.

"Finally, this afflux eroded a part of the bank at RD-10, causing a breach in MNVD."

According to Sindh Special Irrigation Secretary Jamal Mangan, "the breach at RD-10 will help deplete Manchhar's [water] level".

Manchhar lake has been witnessing a surge in its water level in recent days as floodwaters from the north and hill torrents from Balochistan flow southwards to converge in Sindh, leaving behind a trail of deaths and destruction.

As of 6am today, the water level in Manchhar was recorded at 123.25-foot reduced level, Mangan said.

The reduced level of 124ft is described as dangerous.

Later, an engineer of the provincial irrigation department, Mahesh Kumar told Dawn.com that the water in the lake had dropped further to 123.2-foot reduced level. The was one decimal point less than the level of 123.3 RL recorded the previous night, he added.

Earlier, authorities had breached the lake's dyke at two locations, in a bid to save the densely populated cities of Sehwan and Bhan Saeedabad from flooding by diverting water to less populated areas.

Mangan said water flowing from the breaches at RD-14 and 52 was accumulating in a pocket. "Now, water flowing from the breach in MNVD at RD-10 will also end up in the same pocket."

A Dawn.com correspondent present at the site reported that around five people were swept away by raging waters and later rescued after water burst through the breach at MNVD.

He said the five individuals were on motorcycles and passing by the drain when the path they were on collapsed and they fell in the raging waters.

Meanwhile, there were also reports of flooding in the five union councils of Sehwan — Jafferabad, Bubak, Wahur, Channa and Arazi — aggravating as a results of breaches at RD-14 and 52.

The reports of flooding began coming on Monday, with the first breach having been made on Sunday.

Dawn reported that the runway at Sehwan’s Shahbaz Airport was under a foot of water while the Pak-Arab refinery located in the area was also inundated.

Meanwhile, there were also reports of over 100 villages in Sehwan's five affected UCs experiencing worsening floods, which compelled residents to evacuate.

Sardar Sikandar Rahopoto, an MNA from Sehwan, told Dawn.com on Tuesday that a population of around 150,000 was affected due to breaches on Manchhar's dyke and most of the affected families and individuals had been evacuated.

Separately, Jamshoro Deputy Commissioner Fariduddin Mustafa said residents affected by floods were being provided rations, cooked meals and other facilities.

Meanwhile, a motorway police officer, Saqib Ahmar, said that the Indus Highway from Sehwan to Bhan Saeedabad had drowned due to flooding and traffic was also closed for that section.

Being downstream on the Indus River, the southern parts of the country have witnessed swelling river waters flowing from the north. Pakistan’s limited dams and reservoirs are already overflowing and cannot be used to stop downstream flows.

An update on the Flood Forecasting Division's website showed that there was a high-level flood in the Indus River at Kotri.

Sindh CM plans to dewater agri-lands

Meanwhile, Sindh Chief Minister Syed Murad Ali Shah, while talking to a high-power delegation of UAE led by Hamoud Abdulla Aljeibi and DG Secretary UAE Red Crescent regarding the relief work in Sindh, stressed dewatering agricultural lands so that wheat crop could be sown to avoid the famine-like situation in the province.

“We have to rehabilitate over 1.5 million people, restore 3,172,726 acres of land for rabi crops — particularly wheat — otherwise food shortage would emerge,” he said, adding that this was a gigantic task for which the international community would have to support the provincial government.

Shah said that agricultural machinery, fertilizers, seeds, and technology would be arranged to provide growers to start sowing wheat. “Our wheat is the most important rabi crop, and it was badly needed to meet the wheat requirement of the province."

Separately, the chief secretary told the delegation that over a million tents, three million mosquito nets, kitchen sets, mosquito nets for animals, ration bags, and drinking water were needed.

The UAE Secretary of Red Crescent, Relief and Rehabilitation, Hamoud Abdullah Aljeibi, told the chief minister that the country was ready to support the people of Pakistan, particularly Sindh who had suffered immensely.

He said that on September 10, a program was being organized in Dubai to raise funds for the flood-affected people of Sindh.

“We are arranging more tents, mosquito nets, medicines, and other required materials so that the original need can be met,” Aljeibi added.

The chief minister also highlighted that the water coming down the hills of Balochistan was still wreaking havoc in various districts of the province, particularly Shahdadkot, Dadu, and Jamshoro.

He added that due to breaches in Manchhar Lake and other drains the number of people being rendered homeless was increasing day by day.

COAS visits rain-hit areas of Balochistan

Earlier in the day, Chief of Army Staff (COAS) General Qamar Javed Bajwa visited the far-flung flood-affected areas of Balochistan.

According to a statement by the military's media wing, the army chief overviewed relief efforts in Usta Muhammad and Jafferabad districts where he was briefed about the ongoing rescue operations.

"The COAS met with the troops and appreciated their efforts for the flood affectees."

The Inter-Service Public Relations (ISPR) added that Gen Bajwa met local elders in Sui and inquired about their well-being and other issues.

11 more deaths reported

Separately, the National Flood Response Coordination Centre (NFRCC) said the floods had claimed 11 lives over the past 24 hours across the country, taking the death toll since June 14 to 1,325.

Scattered thunderstorm/rain of moderate intensity with isolated heavy falls were expected over the upper catchments of all major rivers along Khyber Pakhtunkhwa, Islamabad and Rawalpindi, Sargodha, Gujranwala, Lahore and Faisalabad divisions, it said.

The centre said that 363 army helicopters had been flown to various areas for evacuating stranded people. "In the last 24 hours, 25 sorties have flown and evacuated 131 stranded individuals and delivered 32 tons of relief items to flood affectees," the latest update said.

It added that so far, 3,716 stranded Individuals had been evacuated through these helicopter sorties.

Further, the centre said that there were 147 relief camps in Sindh, South Punjab and Balochistan while 284 relief item collection points had been established across the country.

"More than 250 medical camps established so far in which more than 97,000 patients have been treated all across the country and provided 3-5 days’ free medicine," the NFRCC said.

The centre also said that construction of Saggu bridge at N-95 (DI Khan) was in progress and was likely to be completed by today.

"Electricity supply restored in Khuzdar and repair work on Dadu-Sibi-Quetta transmission line is in progress," the statement said, adding that the gas supply in Quetta had been partially restored.

International aid continues

Meanwhile, Japan announced it would provide emergency grant assistance of $7 million to Pakistan, according to a news release issued by the Japanese embassy.

Japanese Ambassador to Pakistan Mitsuhiro Wada reaffirmed his commitment to support the country and assured his government stood ready to help the flood-affected people.

“Given the rapidly rising scale of needs, we consider it critical to extend our best support and stand available to the affected”, he said.

Qatar also announced it had launched an air bridge to continue the relief campaign for flood affectees, according to a press release from the Qatar Fund for Development.

It said a relief aid plane was sent through the Emiri air forces, in cooperation with the Permanent Committee for Search and Rescue of the Internal Security Forces of Lekhwiya, Qatar Charity and the Qatar Red Crescent, containing 23 tonnes of medical materials, medicines and special materials to improve shelter facilities.

The UN refugee agency also said it was scaling up support to Pakistan.

"Starting Sunday, UNHCR has mounted a huge airlift operation from Dubai — meant to focus on the worst affected areas of southern Sindh province, where Larkana and Sukkur are the most impacted cities in the country with limited assistance for those displaced from their homes, who require various essential supplies," reads a news release from the agency.

It added that the first three of nine scheduled flights had arrived on Monday in Pakistan — with the other five on their way. The aid included 40,000 sleeping mats, nearly 15,000 kitchen sets and some 5,000 multi-purpose tarpaulins.

The UNHCR said that an additional six flights are scheduled from Dubai for Wednesday and Thursday, with 4,500 sleeping mats, 400 tarpaulins, and nearly 5,000 kitchen sets.

"UNHCR trucks carrying tents for some 11,000 families are also on the road from Uzbekistan, with more convoys scheduled," the UN refugee agency added.

Impending health crisis

Pakistan is struggling to respond to the floods given their unprecedented magnitude. The government has said 33 million people — 15pc of its population — have been affected.

The United Nations has appealed for $160 million in aid to help tackle what it said was an “unprecedented climate catastrophe” and nations had been extending financial and moral support with promises for more.

Meanwhile, large-scale displacements and countries limited resources have led to fears of an impending health crisis.

According to the World Health Organisation, nearly 900 health facilities have been damaged due to floods in the country, 180 of them completely destroyed.

Editorial: The floods are spawning a certain, and deadly, health crisis

And with stagnant water everywhere preventing people from observing even a modicum of hygiene practices, stomach ailments and skin infections have become rampant.

According to the Sindh government, in August alone nearly 200,000 cases of acute watery diarrhoea and dysentery had been reported among children in flood-affected areas.

Given the state of affairs, Health Minister Abdul Qadir Patel said on Sunday that over 1,200 medical relief camps would be set up in more than 20 flood-hit districts this month to provide medical assistance to affected citizens.

Additional input from Reuters