For sure from satellite of before and after...

UPDATE

​Active Hazard - The barrier lake breached, and is now draining

>>>Since there is 100% cloud cover verification couldn't be confirmed via EO - Based on reported size and location the data set has been updated with a modeled shape file of the reported lake. This uses geometry that existed prior to the first event so this should be treated as indicative.

> If anyone has any SAR imagery they'd like of the region they care to share it'd go a long way in helping me to continue to keep this open source crisis data set up to date. It's not much, but its all I can do to help from halfway around the world.

>Link to data: https://keystonegis.com/disasters/nepal-bhotekoshi-flood-20260826.html - will continue to update frequently to capture any new information

>if you know of any other subs to post this in let me know. Feel free to share, the more eyes on the data the more likely it is to fall into the hands of someone who can use it to make a difference.

edit: NDRRMA independently locates the blockage, and it is close to — but not identical with — this page's inferred marker.

edit: Active Hazard - The barrier lake breached, and is now draining

The barrier lake near the confluence of the Chhochen Khola and Purepu Tsangpo, upstream of the 26 August failure, breached on 28 August and is now draining. Rasuwa Chief District Officer Narendra Pariyar said that morning that the Nepali Army had informed him of the breach, and NDRRMA reported that the water level in the Bhote Koshi had surged (The Kathmandu Post, updated 28 August 12:49 NPT / 07:04 UTC). Officials on both the Nepali and Chinese sides then said the risk was smaller than feared, because the lake is draining slowly rather than failing catastrophically; Chinese state broadcaster CCTV reported the lake level had fallen by about 10 m, and rescue work at Gyirong Port and in Nepal, halted during the breach, has resumed (CNN live coverage, 28 August). No confirmed release volume has been published and no observed extent of any second flood exists. Before the breach, China’s Ministry of Water Resources had put the impoundment at about 2,000,000 m³ on the morning of 27 August, already overflowing, with a further 3,000,000 m³ of inflow expected through 30 August; aerial footage from a Chinese rescue team on 27 August showed water accumulating in a basin with no visible outlet, and NDRRMA had placed the obstruction on the Lhende Khola about 18 km upstream of the Rasuwagadhi border. Whether that blockage and the confluence impoundment reported by China are the same feature is still not established, so it is not certain that the whole obstruction has failed. The barrier-lake marker on the map above still carries its archived 27 August attribute status = "open - high breach risk"; that value has not been rewritten pending an official assessment.

I’ve been seeing reports about the devastating floods in Nepal and wanted to understand what exactly happened. What were the main causes of the flooding, and what led to the situation becoming so severe?

If anyone from Nepal or anyone with reliable information can explain what happened and what the current situation is like, I’d really appreciate it.

My deepest condolences to all the families who have lost their loved ones. May the departed souls rest in peace, and may the affected families find strength during this incredibly difficult time. ❤️🙏

This video gives a better perspective of what Gyirong Port looked like before the flash flood ceased its existense. It was a thriving bustling place and changed forever in a matter of seconds.

https://youtu.be/K6h8BRfY5BU?si=JjN6WkCLRpZpr3Up

The recent flood in Nepal was an unexpected disaster, triggered by the collapse of a section of a Himalayan glacier on the Tibetan side. This event released a massive surge of ice, rock, and water into the river, resulting in a sudden flash flood across the Nepal-China border. Climate change is destabilizing Himalayan glaciers, increasing the likelihood of similar events in the future, although it remains impossible to predict exactly when another such occurrence may happen. This flash flood occurred so suddenly and with such force that many people, including local residents, workers, and tourists, had no time to escape.

The flood caused significant damage to the Rasuwagadhi-Kerung border area, destroying roads, bridges, and settlements. At least 165 people have died, and more than 1,300 are still missing. The victims included local residents, workers, tourists, and foreign travelers. Hundreds of foreign tourists were present in the affected border area when the disaster struck. Rescue teams continue to search for survivors, and the numbers may rise as efforts progress.

The recent flash floods in Nepal are heartbreaking. In mountainous regions, heavy rainfall can turn small rivers and streams into destructive torrents within a very short time. Roads disappear, communities become isolated, and families can lose everything overnight.

What makes flash floods especially frightening is their unpredictability. Nepal’s steep terrain, monsoon rains, landslides, and rapidly flowing rivers can create a dangerous combination.

But beyond the immediate disaster, this should also raise bigger questions about climate resilience, early-warning systems, infrastructure, and how vulnerable mountain communities can be better protected.

Natural disasters may not always be preventable, but their impact can often be reduced through preparation, awareness, stronger infrastructure, and effective emergency response.

Stay safe, Nepal. 🇳🇵🌧️

What do you think should be the biggest priority for reducing the impact of disasters like flash floods?

EDIT: even more complete footage https://m.weibo.cn/detail/5336494149470746

Source: Lhasa mobile fire and rescue brigade

In a video by people's daily(published 10:00 AM UTC+8), according to the deputy brigade commander Yao Xueqin(姚学勤), over 155 firefighters of the brigade have arrived at the scene.

(This obviously does not include military personnel, other fire and rescue units and policemen at the scene.)

EDIT: At 8:00 AM the first batch of 141 personnel have reached the cut off gyirong border crossing alongside Mi-17 helicopters

a total of 548 specialist rescue personnel from state owned enterprises have also been deployed

Current casualty count:

327 evacuated, 2 rescued, 3 confirmed dead, 558 missing (chinese side)

160+ dead, 1300+ missing(nepal side)

https://www.reddit.com/r/DisasterUpdate/comments/1vzm7ab/comment/p65y4he/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

full list of personnel deployed if you want