At 8:37 on the morning of August 26, 132 million cubic meters of glacier and rock broke away from the northern side of Langtang Lirung mountain. Seven minutes later, it reached the China and Nepal border immigration checkpoint at Rasuwagadhi, at the speed of 170 km per hour. The first text-message alert left Kathmandu at 9:15. By then the Bhotekoshi was already carrying homes, bridges and a customs post toward the Trishuli, and the Trishuli was carrying them toward Chitwan. The messages came too late for some border settlements in upstream areas, although they gave communities farther downstream more time to respond. More than 1,450 people were dead, over 5,000 went missing, and 13 hydropower projects were impacted, affecting nearly a tenth of the country's electricity production.
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