What is a glacier outburst flood and why does it occur?

Topics Covered: Disaster and disaster management. What is a glacier outburst flood and why does it occur? Context: Parts of Uttarakhand recently witnessed massive flooding after a chunk of the Nanda Devi glacier broke off at Joshimath in Uttarakhand’s Chamoli district. Bringing back haunting memories of the 2013 Kedarnath calamity, the glacier break caused large-scale …