Lanka Rain Water Harvesting forum (LRWHF) was launched in 1996 with the vision of 'leading the nation in rain water harvesting technology, construction and utilization to sustain water needs'.
Links:
[1] http://admin.indiaenvironmentportal.org.in/organisation/lanka-rain-water-harvesting-forum-lrwhf
[2] http://www.lankarainwater.org/
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-harvesting
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-conservation
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sri-lanka
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/south-asia