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South Lhonak Lake is a glacial-moraine-dammed lake, located in Sikkim's far northwestern region. [2] It is one of the fastest expanding lakes in the Sikkim Himalaya region, and one of the 14 potentially dangerous lakes susceptible to Glacial lake outburst flood (GLOFs).
In four decades, as the glacier retreated 1.9 kilometres (1.2 mi), the lake swelled in size, covering nearly 100 hectares (247 acres) by 2008. [5] It was identified as potentially at risk of causing glacial outburst floods, and in 2018 pipelines were carried up by yak and installed to pump water out of it. [ 6 ]
The Lhonak Valley is a grassland in the exposed river valley of Goma Chu in northwest Sikkim, with boggy marshes, glacial lakes, barren scree slopes and glaciers. Goma Chu rises in North and South Lhonak glaciers and runs across the valley to join Zema Chu, a glacier at the southern end of the valley, as is Green Lake. [2]
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A proglacial lake at the head of the glacier burst through a glacial dam, and water from the lake carved a trench down the center of the glacier for more than 0.8 kilometres (0.5 mi). An estimated 2,460,000 cubic metres (650,000,000 US gal) of water were released in four days, raising the flow level of Dinwoody Creek from 5.66 cubic metres (200 ...
In geomorphology, an outburst flood—a type of megaflood—is a high-magnitude, low-frequency catastrophic flood involving the sudden release of a large quantity of water. [1] [2] During the last deglaciation, numerous glacial lake outburst floods were caused by the collapse of either ice sheets or glaciers that formed the dams of proglacial ...
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On 4 October 2023, heavy rains caused a glacial lake outburst flood. [13] The flood reached the Teesta III Dam at midnight, before its gates could be opened, destroying the dam in minutes. [14] Teesta Low Dam III: Output - 132MW , Dam & Powerhouse location - Rambi Bazar, Kalimpong district, West Bengal Constructed by - NHPC Limited. [15]