A tree planting program was organized by Center for Sustainability Solutions (CSS) and Aquatic club, University of Kelaniya in collaboration with National Water Supply and Drainage Board (NWSDB), Sabaragamuwa on 16th November 2017. Around 1500 plants including Terminalia arjuna (kumbuk), Dipterocarpus zeylanicus (hora), Berrya cordifolia (halmilla), Pericopsis mooniana (nedun), Madhuca longifolia (mee) and Areca catechu (puwak) were successfully planted in the water catchment area of We Ganga adjacent to the main water intake of NWSDB, Kahawaththe and the temple premises of Purana Rajamaha Viharaya, Kahawaththe. Around eighty student volunteers representing Faculties of Science and Medicine, Mr. W.W. Liyanage, Deputy General Manager, NWSDB, Sabaragauwa, staff members of NWSDB & twenty Samanera monks of Purana Rajamaha Viharaya, Kahawaththe participated to the event. The Environment Committee of Sri Lanka Association of Advancement of Science (SLAAS) provided 1500 plants. This event was coordinated by Dr. Rangika Bandara, Senior Lecturer, Department of Zoology and Environmental Management.