Kathmandu [Nepal], October 5 – The government is preparing to lower water levels in four high-altitude glacial lakes this fiscal year to reduce the risk of glacial lake outburst floods following the devastating Bhotekoshi flood.
The August 26 disaster triggered after part of Langtang Lirung mountain collapsed, killed more than 1,400 people and left 5,285 others missing according to the government data. The disaster caused extensive damage in Rasuwa, Nuwakot and other areas connected to the China border.
Government officials said detailed studies and designs for lowering water levels in Thulagi, Lower Barun, Lumding Tsho and Hongu-2 glacial lakes will begin this fiscal year.
Subash Tuladhar an expert at the Nepal Hydrology and Water Resources Research Centre, said the project aims to reduce the risk of natural dams holding the lakes collapsing and lessen flood threats downstream. The project could take up to six years to complete and is estimated to cost around $50 million.
Under the plan channels will be built to release water in a controlled manner into nearby rivers. Sensors will monitor water levels and risks while flood forecasting and early-warning systems will also be established.
The project will be supported by the Green Climate Fund, UNDP and the government.
Nepal has previously lowered water levels in Tsho Rolpa and Imja glacial lakes. Experts say rising temperatures are accelerating glacier retreat and increasing the formation and expansion of potentially dangerous glacial lakes across the Himalayas.
