The first and foremost challenge in South Asia is the vulnerability to water related disasters. This cause huge loss of life and property estimated loss range from 2-20% and revenue loss between 12-66% and it hinders sustainable development for poverty reduction by eroding hard earned gains of development.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/water-management-south-asia
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/new-nation-bangladesh
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-resources
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rivers
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-management
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bangladesh
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nepal
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sri-lanka
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/south-asia