China's new mega dam triggers fears of water war in India

India fears Chinese dam will reduce flow on major river by up to 85% in dry season, write Sarita Chaganti Singh and Krishna N. Das from Parong, India

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ndia 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 weaponise its control of the river, which originates in the Angsi Glacier and is known as the Siang and Brahmaputra in India.

India’s largest hydropower company in May moved survey materials under armed police protection near a prospective site of the Upper Siang Multipurpose Storage Dam, which would be the country’s biggest dam, if completed. Senior Indian officials have also been holding meetings about accelerating construction this year, including one organised in July by Prime Minister Narendra Modi’s office, according to two of the sources, who spoke on condition of anonymity to discuss sensitive government matters.

Delhi’s concerns were described in the undated Indian government analysis of the Chinese dam’s impact, the specifics of which Reuters corroborated with four sources and is reporting for the first time.