Abstract
Combining effects of prolonged rock fall, glacier avalanche, multiple damming of streams, rapid erosion of slope materials and sudden rise in temperature witnessed a flash flood situation on 7 February, 2021. Aftermath of initial incidence which was occurred in the morning 1015 hours at upper reaches of Raunthi Gadhera, within 30 minutes Rishiganga, Dhauliganga and Alaknanda rivers swelled enormously. Unprecedented discharge of the same washed off functional Rishiganga hydroelectric project of 13.2 MW capacity on Rishiganga near Rini while badly damaged under construction hydropower project of 520 MW of National Thermal Power Corporation at Tapoban on Dhauliganga river. Except for, 5 pedestrian bridges in various places over Dhauliganga river along with one motorable RCC bridge over Rishiganga at Rini leading to Joshimath - Malari State Highway were swept away in flash flood wherein disrupted the connectivity along with other supply of 13 villages. This caused heavy damage to life and property, particularly in these hydropower project sites. As many as 204 persons went missing, of these bodies of 77 persons could be recovered along with 12 persons injured and 184 farm animals were lost in this incidence. The aim of the present research is to examine the possible causes of the rock fall and flash flood together with their destructive effects. This work also focuses on present risk scenario and suggestions for disaster risk reduction within the affected region.
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