People residing on the banks of the Siang river in Arunachal Pradesh heaved a sigh of relief on Saturday, as water overflowing from a landslide-induced barrier across the river upstream in China eased within 14 hours.Beijing had informed New Delhi that the natural overflow from the barrier in Yaluzangbu (Tsangpo) occurred at 2.30 p.m. on Friday and the discharge was 18,000 cubic metres per second. The barrier was formed soon after a landslide at Jiala village in Milin county of the Tibet Autonomous Region of China on October 17.Tsangpo flows into Arunachal Pradesh as the Siang, which meets two other rivers to form the Brahmaputra downstream in Assam.Soon after the Central Water Commission issued an alert about the Tsangpo barrier breach, Arunachal Pradesh’s Disaster Management Secretary, Bidol Tayeng, instructed the authorities of districts that the Siang passes through to take precautionary measures.“A fairly high volume of clear water reached Pasighat town around 7.30 a.m., but the flow was not as forceful as we had feared. The water level has been rising, besides turning turbid by 10 a.m., but there’s no reason to panic,” Tamiyo Tatak, Deputy Commissioner of East Siang district, told The Hindu.The water took more than 14 hours to reach Pasighat, the headquarters of East Siang district, close to the border with Assam. .Tuting, in Upper Siang district of Arunachal Pradesh, is the habitation on the Siang river closest to the China border. The impact at Tuting could not be ascertained because of poor connectivity.First of its kindMr. Tayeng said the preparation for averting a disaster was the first of its kind involving the State machinery, the Union Home Ministry and government agencies such as the National Disaster Response Force, the Air Force, the Central Water Commission and the India Space Research Organisation.“After the overflow at the landslide location in Tibet, 80 km downstream of Nuxia Hydrological Station, the water rushed down and reached Tuting at about 10:37 pm on Friday. It then reached Yingkyiong at about 01:37 am on Saturday before easing as it flowed towards the foothills,” he said.He said the districts through which the Siang flows were wary of a Tsango barrier-induced disaster in 200. That year, Tsangpo was blocked for 62 days after an earthquake. The barrier breached after two months and the State suffered an estimated loss of more than Rs. 1 billion after a barrier in the Tsangpo closer to India-China border gave way.At least 30 people were killed and 100 went missing while more than 50,000 people in five districts of Arunachal Pradesh were left homeless by the resultant flash floods.