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Nation warned of more downpours

NATIONWIDE: Thailand, especially its western regions where officials are making historic huge discharges of water from the brimming Sri Nakarin dam, will be further hit by downpours triggered by Tropical storm ‘Barijat’ in the South China Sea and Typhoon ‘Mangkhut’ near the Philippines from today (Sept 13) until next Tuesday (Sept 18).

weather
By Bangkok Post

Thursday 13 September 2018, 09:20AM


Tropical storm Bajirat (near top left) and super-typhoon Mangkhut, aimed directly at the Philippines and Hong Kong, will bring torrential rain to Thailand through the weekend. Graphic via earth.nullschool.net

Tropical storm Bajirat (near top left) and super-typhoon Mangkhut, aimed directly at the Philippines and Hong Kong, will bring torrential rain to Thailand through the weekend. Graphic via earth.nullschool.net

Both storms are moving westward, with Barijat expected to whip Hong Kong and Hainan while Mangkhut is predicted to make landfall in southern China, the Meteorological Department warned yesterday (Sept 12).

These weather systems will dump more rain on Thailand which has already been soaked by a month of rainfall, battled flash floods in dozens of provinces and fretted over dangerously high levels of water in reservoirs.

The impact of Barijat, with wind speeds near its centre measured at 70 km/h yesterday, will be felt first when it hits Hong Kong and Hainan today and tomorrow (Sept 14), the department said.

Rainfall during this period will be intensified by a stronger southwest monsoon in the Andaman Sea, which will also cause higher waves in the upper part of the Gulf of Thailand.

The country will then be faced with the effect of Mangkhut until next Tuesday, the department added.

The typhoon is expected to make its way past Luzon Island in northern Philippines and Taiwan this weekend before hitting southern China between Sunday (Sept 16) and next Tuesday.

Its arrival in the upper South China Sea will make the southwest monsoon stronger. A result, the department said, is more rainfall, and heavy downpours in some areas, especially regions which “directly face” the monsoon in the western part of the South and the Central Plains as well as the East.

Provinces prone to mountain run-off, flash floods and mudslides were told to stay alert.

Officials in Kanchanaburi, which is located in the west of the Central Plains, are closely monitoring the situation.

Measures to reduce levels of water in its two major dams are being implemented to ensure they have more room for a next bout of rainfall.

New Paths Retreat

The Sri Nakarin dam, which sits on the Kwai Yai River in Sri Sawat district, can now hold only 1,458 million cubic metres of water as the reservoir was at 91.7% of its capacity, said dam director Prasoet Inthap.

With a continual inflow of water, officials need to increase its discharge rate from 28 to 32mn cu/m a day, the highest amount since the dam began operating 37 years ago, officials said.

They will switch to the new discharge rate tomorrow and continue it until the end of this month.

Another major dam, the Vajiralongkorn, in Thong Pha Phum district, is releasing more water to the Kwai Noi River after its water level reached 95% of capacity. Up to 58mn cu/m of water will be discharged every day until Sept 30.

Riverside communities located downstream were told to brace for the overflow.

Muang district, which is where the Kwai Noi and the Kwai Yai rivers merge and become the Mae Klong River, is expected to be inundated.

When water levels in the first two rivers increase, officials need to closely watch the Mae Klong, which further runs to Ratchaburi and Samut Songkhram provinces before pouring into the Gulf of Thailand.

Elsewhere, pre-dawn heavy rainfall yesterday sparked flash flooding in the Rong Kluea border market in Sa Kaeo’s Aranyaprathet district in the East and parts of Amnat Charoen’s Muang district in the North East.

Residents living near Amnat Chaoren Hospital blamed encroachment on a kaem ling (monkey cheek) water retention area near the hospital for slow flood drainage.

Read original styory here.

 

 

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