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China warns that a lake formed near the Nepal border by glacier debris is starting to overflow

Chinese authorities announced on Friday that a lake created by debris from the glacier collapse which caused catastrophic flooding along the China-Nepal boundary has started to 'overflow. This forced rescue operations to stop. China and Nepal?both warned of new?risks for flooding in the Himalayas on Thursday, as a 'debris dam' created a lake that was threatening to collide. China has been rushing to reduce the threat of further flooding at the border crossing connecting its Tibet region with Nepal after a deadly flash flood occurred on Wednesday.

The state broadcaster CCTV reported on Friday that the risks of the lake bursting, as well as secondary disasters like mountain collapses and an avalanche, have caused?all Chinese emergency vehicles and personnel to withdraw and stand by in a secure area.

The reservoir of the?lake has reached 2.5 million cubic meters, up from 1.5-2 million cubic meters that an eight-member Chinese engineering team dispatched to the site recorded the day before.

CCTV reported that authorities mobilized the engineering team on Thursday to conduct aerial surveys of the barrier lakes and 3D modeling.

Chen Hanxiao, one of the engineers, said that the site was difficult to access.

Chen, speaking to CCTV on Thursday night, said that after the glacier collapsed and created the lake many steep cliffs were visible along its shoreline.

Chen explained that the best way to reduce the threat of the lake is to dig a drainage channel near the dam. This channel's width and depth were calculated based on the speed of the water flow and the rate at which the lake would fill.

According to their survey, the lake measured 150 meters in length and 40-50 meters in depth.

Gyirong's border port has experienced light to moderate rain, which has caused soil and rock around the unstable zone upstream to become looser. Rain is expected to continue for the next week.

China warned on Thursday that 3 million cubic meters -- equivalent to about 1,200 Olympic-sized swimming pools -- will flow into the lake still dammed over the next three days, creating a risk of breach. Peak flow is expected around September 1.

A Chinese rescue team captured the formation of a lake barrier in aerial footage shown by CGTN, state broadcaster. The footage showed?masses of brown water accumulating into a basin without a visible outlet. It had already submerged trees and bushes, and was pushing against a wall of stones and debris. Officials say that nearly 1,000 people are still missing, on both sides, including 540 foreigners. Reporting by Liz Lee and Qiaoyi Li; Editing by Lincoln Feast.

(source: Reuters)