KHAGEN BHARALI,is the Ranganadi novel best selling author of divergent, the first book has depicted Environmental threats in the downstream impacts of foundation of big dam over Himalayan heights, lineaments caused future disasters in the downstream of Assam fectch erosion, silting of sand grains and pollution of water content with floride could damaged human lives, the potential for conflict looms with pulic resilience. Bharali works in Arunachal Pradesh for 35 years in various capacities with his post graduation from Indian institute of Remote Sensing,Dehradun which reflects Remote Sensing as a powerful tools for state-of-the-art technology to be used for mitigation of disaster challenges.