cross-posted from: https://lemmy.sdf.org/post/41014217

• India fears Chinese dam will reduce flow on major river by up to 85% in dry season
• Delhi says a mega dam of its own will mitigate risks, but faces heavy local resistance
• Beijing building world's largest dam upstream of India, but says it won't divert water

India fears a planned Chinese mega-dam in Tibet will reduce water flows on a major river by up to 85% during the dry season, according to four sources familiar with the matter and a government analysis seen by Reuters, prompting Delhi to fast-track plans for its own dam to mitigate the effects.

The Indian government has been considering projects since the early 2000s to control the flow of water from Tibet's Angsi Glacier, which sustains more than 100 million people downstream in China, India and Bangladesh. But the plans have been hindered by fierce and occasionally violent resistance from residents of the border state of Arunachal Pradesh, who fear their villages will be submerged and way of life destroyed by any dam.

Then in December, China announced that it would build the world's largest hydropower dam in a border county just before the Yarlung Zangbo river crosses into India. That triggered fears in New Delhi that its longtime strategic rival - which has some territorial claims in Arunachal Pradesh - could weaponize its control of the river, which originates in the Angsi Glacier and is known as the Siang and Brahmaputra in India.

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