Laos dam collapse raises questions about construction standards

The collapse earlier this week, which killed at least 27 people and left 131 missing, was most likely caused by heavy rainfall or shoddy engineering. Laos has dozens of other hydroelectric projects under construction. 

Hau Dinh/AP
Thongla Inthavong and her husband Kongvilay clean up their house as the floodwaters start to recede in the Sanamxay district of the Attapeu province in Laos on July 26, 2018. Authorities and the company that built the dam are investigating why a dam in southeastern Laos collapsed earlier this week, killing at least two dozen people and leaving more than a hundred missing.

Authorities in Laos ordered closer monitoring of hydroelectric facilities as they investigate why a dam in the country's southeast collapsed earlier this week, killing at least 27 people and leaving 131 missing.

Floodwaters that rose to rooftops were slowly receding Thursday as evacuees trickled back to villages inundated with mud.

Farmer Kongvilay and his wife Thongla Inthavong returned after spending two nights at a shelter to find their wooden stilt house had been washed 160 feet away into their rice field. The family left the house in a rush as the water level climbed to 6 1/2 feet in just one hour after the dam broke late Monday.

"I'm worried the same accident might happen again," Ms. Thongla said as she and her husband scraped mud off their belongings. "But we can't live anywhere else. We've been here our entire lives."

In a report Thursday, the state-run Vientiane Times said the Ministry of Energy and Mines had ordered closer monitoring of water levels in reservoirs and of conditions at dam sites.

It said the thousands of people stranded on rooftops and in trees had been rescued by Wednesday. Laos Prime Minister Thongloun Sisoulith described the disaster as the worst in years in the impoverished country, with more than 6,000 people displaced after the auxiliary dam of a joint venture hydroelectric project gave way after days of torrential rains.

Mr. Thongloun said authorities were investigating whether the dam's collapse was caused by the heavy rainfall or by inadequate construction standards. The South Korean company responsible for building the dam, SK Engineering & Construction, said it also was trying to determine why the dam failed.

The Red Cross, South Korean government and other organizations were rushing water purifiers, food, and other aid to shelters crowded with hundreds of displaced families evacuated from a half-flooded no-man's-land of orange mud and debris.

Initially, state media reported that hundreds of people were missing and feared dead. Difficult communications and heavy rains, which have hampered rescue efforts, likely contributed to discrepancies in information about casualties.

The exact circumstances of the dam's collapse remain murky, and local officials said they had formed a committee to "seek common ground on the responsibilities and obligations for the tragic disaster," the Vientiane Times reported.

SK Engineering & Construction said the dam began failing Sunday, while Korea Western Power, another partner in the project, said the earth-fill dam began visibly weakening on Friday.

SK Engineering sent its president and an emergency team to help with the rescue and repair effort. In a statement Thursday, it said it would help build lodging for those displaced.

"We will find out causes of the incident thoroughly and take necessary actions quickly," it said in a statement earlier this week.

The Thai partner in the dam project, the Ratchaburi Electricity Generating Holding Public Co., said the joint venture had sent experts to the area to investigate the situation and discuss with the authorities how to resolve the problem.

Monsoon rains clearly contributed to the disaster: A report by the intergovernmental Mekong River Commission said storms had caused water levels along the river to rise by 9 to 15 feet in the past week.

Continued heavy rain and strong winds forecast for the area could hinder recovery efforts, and risks from flooding persisted in the mountainous region.

But a flurry of dam building along the Mekong River and its tributaries, including those affected by this disaster, has raised concerns over environmental impact and other problems.

The $1.02 billion project encompassing several river basins in a remote corner of southeastern Laos is the first hydroelectric dam to be built by a South Korean company, and it was unclear how severe the damage would be to the overall plan. The dam was due to begin operating in 2019, with 90 percent of the power generated going to Thailand.

Laos has dozens of hydroelectric projects under construction and plans for sales of power to neighboring countries, now accounting for about a third of its exports, to grow substantially.

International Rivers, a nongovernmental group generally critical of such projects, said the catastrophe showed the need to improve warning systems.

"With over 70 hydropower projects currently built, under construction and planned across Lao PDR – most of them owned and operated by private companies – authorities must immediately review how dams are being planned, designed and managed," the group said in a statement.

This story was reported by The Associated Press. 

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