DEHRADUN: A preliminary digital analysis of the Nanda Devi National Park revealed extensive damage to flora and fauna of the sanctuary, a Unesco World heritage site, caused by the flash flood. Forest officials said that Raunthi area, the core zone of the national park, had been badly hit. Also, according to experts of the Wadia Institute of Himalayan Geology (WIHG) as well as other institutes studying reasons behind the flood, the water had further damaged a 22km stretch from Raunthi to Tapovan. The current had sliced off a side of the mountain, sweeping away trees, medicinal herbs, shrubs, endangered species like musk deer, Himalayan goats as well as leopards.