Nepal Flood 2026 Explained: Where did all the water come from?

Drop a block of pure ice off a mountain a kilometre high and let every bit of the energy of that fall go into melting it. About three per cent of it turns to water. Three per cent. Eight minutes after a mountain came down on the Nepal-Tibet border on 26 August, a five-storey building at Rasuwagadhi was gone, and so was the ground it stood on. There was no glacial lake up there — a satellite would have seen one. So where did the water come from? This is the fifth film about that morning, and the one where I go back over what the first film told you. In that film I said the debris blocked the river, a lake built up behind it, and the blockage burst. That was the reading almost everyone had in the first forty-eight hours, and it came from Nepal's own Flood Forecasting Division rather than from nowhere. The gauge records have arrived since, and they put a much harder clock on the whole thing. Dozens of you ran the physics in the comments and concluded friction cannot melt enough ice to do this. You are right — and there is one step where the sum goes wrong. That is the spine of this film. Everything here is labelled ESTABLISHED, DISPUTED or UNKNOWN. This one leans on the third harder than anything I have made, because the number that would settle the argument — how much of the mass that fell was ice — has not been published by anybody. ⚠️ IF YOU WANT TO HELP THE PEOPLE AFFECTED Two vetted relief organisations. No affiliate links. Nothing in this description benefits this channel. Nepal Red Cross Society https://donation.nrcs.org/ IFRC Nepal Flash Floods 2026 Appeal — easier for cards outside Nepal https://donate.redcrossredcrescent.or... Disaster fundraising attracts scams — verify any account details you are sent against official channels. CHAPTERS 0:00 Three per cent 0:27 Established, disputed, unknown 1:12 Four things ahead 1:40 What has changed since the first film 2:30 The vertical a photograph cannot carry 3:10 The rock went first, the glacier came with it 4:08 Two clocks, two hours and fifteen minutes apart 4:49 Under thirteen minutes 5:52 Answer one: it melted itself 6:43 What melting actually costs 8:07 The rock is the battery 9:38 What it took to work out Chamoli 10:30 The number nobody has published 11:32 Was there ever a dam? 13:27 The river shoved ahead of it 14:05 The answer that came from you 15:13 The debris stopped in the gorge 16:04 The water reached the Ganges 16:59 Twelve, and two hundred and thirty-three 18:01 Three things, ranked 18:51 Bring a source and I will pin it THE SERIES Part 1 — What Caused the Deadly Flash Flood?    • Nepal Floods 2026 Explained: What Caused t...   Part 2 — The Dangerous Lake Left Behind    • Nepal’s Flood Isn’t Over: The Dangerous La...   Part 3 — Why There Was Almost No Warning?    • Nepal Floods 2026: Why Was There Almost No...   Part 4 — Why Is It So Hard to Reach 100 People Inside a Flooded Mountain?    • The Race to Rescue 100 Workers Trapped in ...   SOURCES Seismic record — USGS events us7000tbwb (M5.2, typed landslide) and us7000tc90 Bedrock failure carrying the glacier — Dan Shugar; Jakob Steiner; Mohd. Farooq Azam (ICIMOD) Origin on the Nepali side — Binod Parajuli, Nepal DHM Not a GLOF — Dave Petley, The Landslide Blog; ICIMOD Cause unconfirmed — Qianggong Zhang and Sarthak Shrestha, ICIMOD The landslide-dam mechanism — Steiner; Shrestha; Rijan Bhakta Kayastha (Kathmandu Univ.); ICIMOD The three water sources, with his own caveat "But I am speculating" — Petley Gauge chain and the under-thirteen-minutes bound — DHM Flood Forecasting Division, 27 Aug 2026 Chamoli 2021 — Shugar et al., Science 373(6552):300-306 (~80% rock / ~20% ice by volume; "nearly all of the ice melted") Quantifying water inside these flows — Munch, Zhuang, Dash & Bartelt 2024, JGR Earth Surface e2024JF007805 The 0.3–0.7 shear-heat fraction — Pudasaini, arXiv:2404.06130 (a single-author preprint; the film says so) Run-out distance — USGS Landslide Hazards Program, preliminary Body recovery by district — NDRRMA, as of 19:00 on 29 August Bodies recovered in Uttar Pradesh — SDRF; DM Gaurav Singh Sogarwal, who said only that they are thought to have come from Nepal Roads and bridges — Nepal Ministry of Physical Infrastructure and Transport Gandak barrage — Bihar Water Resources Dept HOW THIS VIDEO WORKS ESTABLISHED: more than one credible source agrees and I have checked it. DISPUTED: good sources disagree and I show you both. UNKNOWN: nobody knows yet, including me. OUR ARITHMETIC marks the energy calculation, which is mine and not a published result. It is a ceiling — it assumes every joule of the fall goes into melting ice. The honest band is shown beside it. AI SIMULATION marks computer-generated schematics, not footage. STOCK VIDEO — NOT THIS EVENT marks illustrative stock filmed somewhere else. No footage of the 26 August 2026 event appears in this film.