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I can't imagine it! There was a flood that even the dam rushed away! This miracle happened in the northeastern Indian state of Sikkim! According to CCTV news and other media reports, on the evening of October 4, the northern part of Sikkim was hit by torrential rains, and flash floods occurred in the area around the famous Lake Lonak, which quickly rushed into the Teesta Valley and directly into the reservoir of the No. 3 Hydropower Station of the Teesta River downstream.
Strangely, under the rapid flooding, the operators of the hydropower station did not receive any flood warning signals. Trying to prevent trouble, they hurried to open the floodgates and release water, but before they could open the floodgates, the huge dam of the hydropower station actually moved under the violent impact of the flood, and then quickly cracked and fell apart, disappearing in an instant.
Teesta River 3 Hydropower Station is the largest hydropower station in Sikkim with an installed capacity of 1.2 million kilowatts. The hydropower plant, which was commissioned in 2017 with an investment of more than Rs 15,000 crore, is now valued at Rs 25,000 crore, equivalent to about 21.6 billion yuan, as it became profitable last year.
Sikkim holds more than 60% of the hydropower plant.
Part of the southern slopes of the Himalayas, Sikkim covers an area of 7,096 square kilometers at an altitude of more than 1,500 meters and has a population of about 725,700. Bordering mainland Tibet, Bhutan and Nepal, it was once an independent kingdom known as Zhemengxiong on the mainland in ancient times, and became a vassal state of Tibet during the Qing Dynasty.
However, the great powers of South Asia have always been interested in annexing this fertile land. In 1975, the Kingdom of Sikkim was overthrown by neighboring countries, and through rigged referendums, sovereignty over Sikkim was abolished and taken over by neighboring countries, and the 12th King Peden Dondanjanga was forced into exile in the United States.
The Teesta River 3 hydropower plant was highly anticipated by Sikkim, the state's largest hydropower plant, which had only been profitable for a year, and no one expected it to be destroyed by a flood. And the hydropower plant is a reinforced concrete faceted rockfill dam, similar to a gravity dam. Such a dam would be expected to withstand flooding, but in the worst case, it would only lead to a spill, i.e. a flood that exceeds the height of the dam and overflows from above.
However, the dam of this hydroelectric power station was washed away by the flood, and the dam body disappeared completely. The results are jaw-dropping.
From the photographs of the site on October 4, we can see that one end of the hydropower station is completely cut open by a knife, like a high wall.
Comparing with the houses and other buildings built above, we can see that this steep "high wall" is tens of meters high. The image above shows the aftermath of the October 4 flood, while the image below shows the image before the flood. From above, the dam was washed away, revealing rugged stones, and the dam's floodway diversion channel was dented by the impact of the flood.
This shows that the flood is fierce, and because the dam is washed away, the flood water in the reservoir is almost completely drained.
This incident revealed the poor quality of the hydroelectric plant. The bottom of the dam has not been reinforced, and there is no trace of reinforced steel at all. It appears that it simply piled concrete directly on the rocky surface at the bottom, forming a dam.
What is even more incomprehensible is that the floodgate and diversion trough of the hydropower station and the dam are not a monolithic structure. From the outside, there are no connecting parts between the two, they are separate architectural structures. That is, one end of the hydroelectric dam is not fixed to the mountain next to it.
Such a peculiar way of designing and building is really amazing.
In fact, the flooding of the Teesta River not only washed away the dam of the Third Hydroelectric Power Station, but also swept through 15 bridges and a large number of buildings such as houses in the downstream area, and many roads were also washed away. By noon on October 7, the floods had killed more than 50 people, left 150 missing, and affected 22,000 people, according to local statistics.
After the flood, everything on the ground was completely erased, and the downstream area was reduced to a Ze country.
In India, a 42-year-old dam was destroyed by floods just one day after it was put into service, and a series of bridge collapses occurred.
The washout of the dam has attracted widespread attention, and many people believe that this is clear proof that the hydropower station was shoddy and corrupt during its construction, and that there are many loopholes in the operation and management of the hydropower plant.
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