This explainer evaluates preliminary findings published by the International Centre for Integrated Mountain Development (ICIMOD) regarding the sudden flash flood along the Budhi Gandaki river in northern Gorkha on Sunday, October 11, 2026.
A destructive flash flood that swept through the Budhi Gandaki river system early Sunday, October 11, 2026, may have been triggered by the failure of a temporary river blockage created by a landslide near Chumchet in Gorkha district, according to preliminary accounts from authorities reviewed by the International Centre for Integrated Mountain Development (ICIMOD).
1. What ICIMOD’s Advisory Reports
In a media advisory issued on October 11, 2026, ICIMOD stated that based on publicly available information and preliminary accounts from Nepal's authorities available as of 11:30 a.m. Nepal time, a temporary river blockage caused by a landslide near Chumchet in Gorkha district may have breached, releasing a sediment-laden flood downstream through the Budhi Gandaki corridor.
2. Scope and Information Cutoff
ICIMOD noted that this initial analysis was based on information reviewed as of 11:30 a.m. on October 11, emphasizing that facts and figures remain subject to change as field investigations and response operations proceed.
3. Downstream Safety Advisories Issued October 11
In bulletins issued on October 11, disaster management authorities instructed riverside settlements along the Budhi Gandaki corridor to maintain vigilance against fluctuating water levels following the debris flow.
Source & Reference:
Based on the media advisory published by the International Centre for Integrated Mountain Development (ICIMOD) on 11 October 2026 (information cutoff: 11:30 AM NPT).
