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. A set of supraglacial ponds filled rapidly between April and July 2017 onChangri Shar Glacier in the Everest region of Nepal, coalescing into a ∼180  000 m 2 lake before sudden and complete drainage through ChangriShar and Khumbu glaciers (15–17 July). We use PlanetScope and Pleiadessatellite orthoimagery to document the system's evolution over its very shortfilling period and to assess the glacial and proglacial effects of theoutburst flood. We also use high-resolution stereo digital elevation models(DEMs) to complete a detailed analysis of the event's glacial and geomorphiceffects. Finally, we use discharge records at a stream gauge 4 km downstreamto refine our interpretation of the chronology and magnitude of the outburst.We infer largely subsurface drainage through both of the glaciers located onits flow path, and efficient drainage through the lower portion of KhumbuGlacier. The drainage and subsequent outburst of 1.36 ± 0.19 × 10 6  m 3 of impounded water had a clear geomorphic impact on glacial andproglacial topography, including deep incision and landsliding along theChangri Nup proglacial stream, the collapse of shallow englacial conduitsnear the Khumbu terminus and extensive, enhanced bank erosion at least as faras 11 km downstream below Khumbu Glacier. These sudden changes destroyedmajor trails in three locations, demonstrating the potential hazard thatshort-lived, relatively small glacial lakes pose.

Glacial and geomorphic effects of a supraglacial lake drainage and outburst event, Everest region, Nepal Himalaya