Hundreds of villagers are still missing in Laos' southern Attapeu province after one of the dams at Xe Pian Xe Namnoy hydropower was crested causing flash flooding, a senior provincial official has said.
Prime Minister Thongloun Sisoulith yesterday cancelled the cabinet's monthly meeting for July and flew to the province's Sanamxay district to supervise the rescue operation there.
The incident led to flash flooding on Monday night, affecting the district's eight villages that are home to more than 4,200 people.
"Villagers have sought shelter on their roofs, and some climbed up trees to escape the flood waters," an official of the provincial rescue operation board said on condition of anonymity.
It was understood that the wall of a dam, which was under construction, was at risk of collapse causing the flooding, he said.
Helicopters, boats with officials and individuals from various sectors have been deployed for the rescue operation to search for the number of people still stranded or missing, district governor Mr Bounhome Phommasane said.
More significant numbers of people have been rescued and are sheltering at the facilities of the district's main municipality.
Rescuers are battling with time as the flood level is poised to increase, the governor said, adding that the number of affected villages are likely to grow amid the rising waters. Moderate and heavy rains with strong winds are forecast for some areas in central and southern provinces in coming days, which could worsen the situation, the Meteorology and Hydrology Department warned.
The government yesterday issued an announcement declaring the flooded area an emergency disaster zone after being informed by Xe Pian-Xe Namnoy Power Company (PNPC) about the accident.
The cabinet has entrusted the Ministry of Labour and Social Welfare in collaboration with the Ministry of National Defence and Attapeu provincial authorities to urgently appoint an Ad Hoc Committee in charge to mobilise aid and relief supplies from all sectors to help the disaster victims.
The incident is Laos' latest dam-related accident to cause flooding with heavy losses. Last year, the reservoir of the 15 MW Nam Ao Hydropower Dam in northern Xieng Khuang province collapsed, resulting in flash floods that damaged properties and risked lives.
The last year's accident prompted members of the National Assembly (NA) to question the government on enforcement of safety standards being applied for the construction of hydropower plants of which Laos has developed and plans to develop more.
Any hydropower projects applying low-quality technical standards in their construction would be cancelled, Minister of Energy and Mines, Dr Khammany Inthilath, told the NA in October last year.
A task force committee had been formed to inspect the quality of hydropower plants across the country, Dr Khammany told the NA's Fourth Ordinary Session.
Construction of the Xe Pian Xe Namnoy hydropower plant began in February 2013 with commercial operations expected to begin within this year.
Constructed by the PNPC, the 410 MW Xe Pian-Xe Namnoy hydroelectric power project is estimated to produce an annual energy generation of approximately 1,860 GWh.
PNPC is a joint-venture formed by SK Engineering and Construction (SK E&C), Korea Western Power (KOWEPO), Ratchaburi Electricity Generating Holding (RATCH), and Lao Holding State Enterprise (LHSE).
SK E&C holds a 24 percent stake in PNPC, LHSE 26 percent, and RATCH and KOWEPO own equal shares of the remainign stake in the project.
Estimated to cost US$1.02bn, the initiative is the first build-operate-transfer (BOT) project to be undertaken by South Korean firms in Laos.
Laos dam collapse leaves hundreds missing and unknown number feared dead