Faculty of Agriculture

University of Peradeniya

Dr. S. Pathmarajah

Senior Lecturer



Official Address :

Department of Agricultural Engineering,
Faculty of Agriculture,
University of Peradeniya,
Peradeniya,
Sri Lanka


Email :

spathma@pdn.ac.lk
s_pathma@yahoo.com


Telephone :

+94 71 443 0505
+94 81 239 5453


Personal Website :






  • D. Tech. (Irrigation Engineering and Management), 1996; Asian Institute of Technology, Bangkok, Thailand.
  • M. Phil (Soil and Water Engineering), 1991; Postgraduate Institute of Agriculture, University of Peradeniya, Sri Lanka
  • B.Sc. (Agric.), 1982; University of Peradeniya, Sri Lanka.
  • Diploma in Coaching for Conflict Transformation and Peace Building Initiatives, 2008; FLICT / GTZ, Sri Lanka.
  • Training of Trainers (ToT) programme on "Interdisciplinary Field Research Methodology", Cox's Bazaar, Bangladesh, Sponsored by ScaiWATERs, 06 - 17 December 2010.
  • Training on "Computer Based Learning Materials Development (CBLM)", University of Saskatchewan, Canada, 14 August - 03 September, 2008.
  • Training on "Participatory Field Research Methodology", Kathmandu, Nepal, 6 - 13 May, 2008.
  • Six-module training on "Conflict Sensitivity", Sponsored and Organized by the Consortium of Humanitarian Agencies (CHA), Sri Lanka, June 2007 - January 2008.
  • Training on "Gender and Water". Hyderabad, India, Sponsored by ScaiWATERs, 08 - 13 October, 2006.
  • Training on "Advanced Watershed Management", Sweden (August, 2002), and India (October, 2002). Sponsored by SIDA.
  • Training on "Strategic Management and Marketing of Training" at the Asian Institute of Management (AIM), The Philippines. Sponsored by the World Bank Institute. 03 - 14 April, 2000.
  • One-year certificate program on "Improving Training Quality through Peer Learning and Distance Mentoring", Thailand, Sri Lanka and Malaysia. A Training of Trainers (ToT) Program Sponsored by the World Bank and conducted by the University of Illinois. May 1999 to April 2000.
  • German Academic Exchange Service (DAAD) Scholarship for Ph. D.
  • Acting Project Director (Mannar, Puttalam, Anuradhapura, Monaragala and Hambantota), Dry Zone Agriculture Development Project, CARE International-Sri Lanka, From March 2005 to May 2005 - Directed an agricultural education program in five districts of Sri Lanka.
  • Team Leader (Mannar), Dry Zone Agriculture Development Project, CARE International-Sri Lanka, From June 2004 to February 2005 - Established and lead an agricultural education program in Mannar District.
  • Research Assistant, International Irrigation Management Institute (IIMI), Colombo, Sri Lanka, June 1986 to August 1988.
  • Research Assistant, Man and Biosphere Project, National Science Foundation / Department of Agric. Engineering, Faculty of Agriculture, University of Peradeniya, Feb. 1983 to Jan. 1985.
  • Lecturer In-charge, University Sub-campus (A field training campus for the Faculty of Agriculture), University of Peradeniya, Mahailuppallama, Sri Lanka, Nov. 2002 to Oct. 2003.
  • Lecturer In-charge, University Sub-campus (A field training campus for the Faculty of Agriculture), University of Peradeniya, Mahailuppallama, Sri Lanka, August. 1999 - Sept. 2000.
  • 7Lecturer In-charge, University Sub-campus (A field training campus for the Faculty of Agriculture), University of Peradeniya, Mahailuppallama, Sri Lanka, 1991.
  • National Consultant / On-farm water management. FAO, Sri Lanka, Sept - Dec. 2014
  • Consultant / Climate resilience survey among farmers, IWMI, Sri Lanka, Sept. - Oct. 2014.
  • Irrigation Specialist / Project Completion Assessment of Dry Zone Livelihood Support and Partnership Programme (DZLiSPP). Funded by IFAD. April - May 2013.
  • Irrigation Specialist / Base Line Survey for the Iranamadu Irrigation Development Project, Kilinochchi, Sri Lanka. Funded by IFAD. November - December 2012.
  • National Consultant / Partner - Water intervention for improving smallholder farming and rural livelihoods in Asia. AIT and FAO, Bangkok. February - April 2012.
  • National Specialist (Irrigation) - Assessment of the sustainability of minor tank rehabilitation program in Trincomalee and Batticaloa districts. FAO, Sri Lanka, April 2011.
  • Member of the Curriculum Development Committee, Faculty of Agriculture, University of Peradeniya, Peradeniya, 2011-2015.
  • Coordinator, Integrated Water Management Programme (IWRM), Board of Study in Agricultural Engineering, Postgraduate Institute of Agriculture, Peradeniya, 2014-
  • Editor in Chief, Tropical Agricultural Research, Volume 26(1-4), Year 2014/15.
  • Coordinator, 26th Annual Congress of the Postgraduate Institute of Agriculture - 2014, University of Peradeniya, Peradeniya.
  • Member of the Editorial Board, Tropical Agricultural Research, Volume 25 (Year 2013/14)
  • Abstract Reviewers, International Academic Committee of the 18th World Congress of CIGR, 2013.
  • Member of the International Editorial Board, International Agriculture Engineering Journal, 2012-
  • Member of the Editorial Board, Tropical Agricultural Research, 2012.
  • Member of the advisory committee to the Staff Development Centre, University of Peradeniya, 2012-
  • Member of the Board of Management, Postgraduate Institute of Agriculture, University of Peradeniya, Nov. 2009 - 2012.
  • Member of the Board of Study in Agricultural Engineering, Postgraduate Institute of Agriculture, University of Peradeniya, Sri Lanka, Feb. 2007 - Jan.2012.
  • Chairman, Board of Study in Agricultural Engineering, Postgraduate Institute of Agriculture, University of Peradeniya, Sri Lanka, Feb. 2007 - Jan.2010.
  • Member of the Teaching Panel in the Board of Study in Agric. Engineering, Postgraduate Institute of Agriculture, University of Peradeniya, Sri Lanka. 1996 - date.
  • Member of the core team on developing "code of conduct for conflict sensitivity (CS)" professionals, Consortium of Humanitarian Agencies (CHA), Sri Lanka.
  • Member of the core team on developing computer based learning material (CBLM) for the B.Sc. Agricultural Technology and Management degree program, Faculty of Agriculture, University of Peradeniya, Sri Lanka.
  • Member of the national team on "development of standards for hardware material for utilization in micro-irrigation activities in Sri Lanka"
Visiting Appointments
  • Foreign Research Fellow / Visiting Associate Professor (Agro-environment), University of Tokyo, three months from 01 Oct. to 31 Dec., 2000.
  • Irrigation
  • Soil and Water
  • Water Quality
  • Small Irrigation Tanks
  • Gender and Water
  • Climate Change and Water
  • Water and Society
  • Groundwater Management
  • Anbumozhi, V., Meinhard Breiling, Pathmarajah, S. and V.R. Reddy (2012) Climate change in Asia and the Pacific: How can countries adapt? Sage Publications, India (ISBN 9788132108948), p400.
  • Pathmarajah, S. (2012). Water management practices and climate change adaptation: South Asian experiences. In: Climate change in Asia and the Pacific: How can countries adapt? Sage Publications, India
  • Kumari, M.K.N., Pathmarajah, S. and N.D.K. Dayawansa (2015). Evaluation of groundwater quality for irrigation in Malwathu Oya Cascade-I in Anuradhapura District of Sri Lanka. Tropical Agricultural Research Vol. 26 (?).
  • Diyawadana, D.M.N., Pathmarajah, S. and E.R.N. Gunawardena (2015). Perception-driven Coping Strategies for Climate Change by Smallholder Farmers in Sri Lanka: A Case Study in Hakwatuna-oya Major Irrigation Scheme. Tropical Agricultural Research Vol. 26 (?).
  • Aditya SoodHerath ManthrithilakeSalman SiddiquiAmeer Rajah, Pathmarajah, S. (2015) Managing shallow aquifers in the dry zone of Sri Lanka. Environmental Monitoring and Assessment. 07/2015; 187(7): 4584.
  • Meththika Vithanage, Thushyanthi Mikunthan, Selverajah Pathmarajah, Sutharsiny Arasalingam and Herath Manthrithilake (2014) Assessment of nitrate-N contamination in the Chunnakam aquifer system, Jaffna Peninsula, Sri Lanka. Springer Plus 2014 3: 271.
  • Sugirtharan, M., Pathmarajah, S. and M.I.M Mowjood. (2014). Variation of Salinity in Batticaloa Lagoon during Wet Season. Tropical Agricultural Research Vol. 25 (3): 403-411.
  • Kumari, M.K.N., Pathmarajah, S. and N.D.K. Dayawansa (2013). Characterization of Agro-Well Water in Malwathu Oya Cascade-I in Anuradhapura District. Tropical Agricultural Research Vol. 25 (1): 46-55.
  • Sutharsiny, A., Pathmarajah, S., Thushyanthy, M and V. Meththika (2012). Characterization of Irrigation Water Quality of Chunnakam Aquifer in Jaffna Peninsula. Tropical Agricultural Research Vol. 23 (3): 237-248.
  • Abeygunawardane A.W.G.N., Dayawansa N.D.K. and S. Pathmarajha (2010). Socio-economic implications of water pollution and pattern of waste generation in an urbanized environment: A case study in Meda Ela catchment, Kandy, Sri Lanka. Tropical Agricultural Research.
  • Mapa, R. B. and S. Pathmarajah. (1995) Contrasts in the physical properties of three soils in an Alfisol Catena in Sri Lanka. Soil Use and Management. 11: 90-93. US.
  • Delina, E. D. P. and S. Pathmarajah. (2014). Spatial analysis on drinking well water quality in eravur pattu divisional secretariat, Batticaloa, Sri Lanka. International Journal of Development Researc. Vol. 4 (9): 1831-1835.
  • Sugirtharan, M., Pathmarajah, S. and M.I.M. Mowjood. (2014). Temporal flux of salinity and lagoon water height in Batticaloa lagoon of Sri Lanka during dry season. European International Journal of Applied Science and Technology. Vol. 1 (5): 151-163.
  • Sutharsiny, A., Manthrithilake, H., Pathmarajah, S., Thushyanthy, M. and V. Meththika (2014). Seasonal variation of nitrate-n in groundwater: a case study from Chunnakam aquifer, Jaffna peninsula.  Ceylon Journal of Science (Physical Sciences) 18: 01 - 08.
  • Fonseka, R.M., Pathmarajah, S. and N.K.A.C. Kodiweera (2010). Status of home gardening in Mahaweli System H area as influenced by the government food production drive - "Let us cultivate and uplift the nation". Sri Lankan J. Agric. Sci. Vol.47: 62 - 73.
  • Mowjood, M.I.M, Pathmarajah, S. and M. Rambanda. (2005) Effects of cracks
  • on water requirement for land soaking in lowland paddy cultivation, J. Soil
  • Sci. Soc. Sri Lanka, Vol (17): 1-10.
  • Pathmarajah, S. and H.M. Somarathne. (2003) Reasons for abandoning agro-wells (large diameter wells): An empirical study. Sri Lankan Journal of Agricultural Science, 40:10-22.
  • Jeyakumar, P. and S. Pathmarajah. (2001) Use of computer based decision support system for on-farm water management in the Batticaloa district. Agrieast, 3: 23-33. Sri Lanka.
  • Jeyakumar, P., Pathmarajah, S. and Ariyaratne. A.R. (2001) User-friendly computer package for on-farm water management in the dry zone of Sri Lanka. Tropical agricultural Research. 13: 112-122. Sri Lanka.
  • Pathmarajah, S. and R.B. Mapa. (1990) Characterization of soil water movement in Reddish Brown Earth soils (Alfisols). Tropical Agricultural Research, 2: 101-113. Sri Lanka.
Scientific Communications
  • Kumara, G.M.P., Perera, M.D.D., Wijekoon, W.M.S.M., Pathmarajah, S., Dayawansa, N.D.K., Mowjood, M.I.M. and Galagedara, L.W. (2015) Water pollution in a natural stream and its impact on society and environment: A review of studies on Meda Ela, Sri Lanka. Proceedings of the 6th International Conference on Structural Engineering and Construction Management, Kandy, Sri Lanka, 11-13 December 2015.
  • Mowjood, M.I.M., Pathmarajah, S., Gunarathna Banda, A.M., Tatsuaki Kasubuchi and Hironori Yasuda (2015) Effects of multiple mechanical weeding on crop growth and yield under non-chemical rice farming in Sri Lanka. INWEPF, Negombo, Sri Lanka, 3-5 November 2015.
  • Sivasankaran, S. and Pathmaraja, S. (2015) Assessment of water use efficiency in red onion cultivation at the coastal belt of Trincomalee North, National Symposium on Agriculture, Eastern University, Sri Lanka, 5 August 2015. 69 - 72
  • Jayaweera, P.M.A. and S. Pathmarajah (2013) Effective stakeholder participation in water resources management: A case study in Komarika Ela scheme. 2nd Sri Lankan roundtable on sustainable consumption and production.National Cleaner Production Centre. Hotel Galadari, Colombo, 21-22 February 2013.
  • Sutharsiny, S. Pathmarajah, M. Thushyanthy, V. Meththika and H. Manthrithilaka (2012). Impact of Agricultural Activities on groundwater quality and its suitability for drinking in Valikamam area, Jaffna Peninsula. First Young Water Professionals Symposium, 22-23 November, 2012, Colombo Sri Lanka, 74-81.
  • Melvani, K. and S. Pathmarajah (2012). Restoration of the riparian zone of lake Richmond through land care. In: Urban lake monitoring and management. Proceedings of an international symposium., 18 May 2012, Peradeniya, Sri Lanka, 105-117.
  • Melvani, K. and S. Pathmarajah (2011). Bioremediation of nitrates in groundwater. In: Water resources research in Sri Lanka, Proceedings of a Symposium, 01 October 2011, Kandy, Sri Lanka.
  • Abeygunawardena, A.W.G.N., Dayawansa, N.D.K. and Pathmarajah, S. (2009). Population pressure and unplanned waste disposal on water quality of an urban stream: A case study of Meda Ela Catchment, Kandy, Sri Lanka, Proceedings of the Fourth South Asia Water Conference, Interfacing poverty, livelihood and climate change in water resources development: Lessons in South Asia, May 4-6, 2009, Kathmandu, Nepal, pp 311-323.
  • Pathmarajah, S. (2008). Groundwater and agriculture: Possible future implications. In: Groundwater in Sri Lanka - A most precious but highly threatened resource, Proceedings of the Symposium, National Academy of Sciences, Sri Lanka (NASSL) in collaboration with the Water Resources Board (WRB) and the Department of Civil Engineering, University of Peradeniya. 24-26 February 2008. Anuradhapura, Sri Lanka
  • Senarathna, W.A.S. and S. Pathmarajah. (2007) Evaluation of the status of coconut based drip irrigation system installed under subsidy scheme. In: De Silva, R. P. and Dayawansa, N. D. K. (Ed.) Water resources research in Sri Lanka. Symposium Proceedings of Water Professionals' day, October 01, 2007, Kandy, Sri Lanka, 147 - 155.
  • Mowjood, M.I.M. and S. Pathmarajah. (2007) Review of historical water sector coordination and allocation issues: Prospects and problems for the future. In: Proceedings of Consultation on effective water institution to promote integrated waster resources management, Sri Lanka Water Partnership, 08 June 2007, Colombo, Sri Lanka, 9-17.
  • Pathmarajah, S. (2006) Role of NGOs in water management (invited presentation). In: Proceedings of an International conference on challenges and strategies for the sustainability of safe drinking water, 25 - 27 October 2006, Madurai, India, 75 - 81.
  • Pathmarajah, S. (2003) Use of groundwater for agriculture in Sri Lanka: A synthesis of the past, present and the future. In: Pathmarajah, S. (Ed.). Proceedings of the symposium on the use of groundwater for agriculture in Sri Lanka, 30 September 2002. Peradeniya, Sri Lanka, 1 - 9.
  • Karunaratne, A.D.M. and S. Pathmarajah. (2003). Groundwater development through introduction of agro-wells and micro-irrigation in Sri Lanka. In: Pathmarajah, S. (Ed.). Proceedings of the symposium on the use of groundwater for agriculture in Sri Lanka, 30 September 2002. Peradeniya, Sri Lanka, 29 - 41.
  • Pathmarajah, S. (2003) Environmental aspects of pesticides in law land rice fields. In: De Silva, R. P. (Ed.) Water resources research in Sri Lanka. Symposium Proceedings of Water Professionals' day, October 04, 2003, Kandy, Sri Lanka., 21-33.
  • Thiruchelvam, S. and S. Pathmarajah. (1999) Hydrologic and economic feasibility of reducing soil salinity problem in the Mahaweli river irrigation system H area, Sri Lanka, In: Proceeding of the International Conference on Agricultural Engineering, 17-13 December, 1999, Beijing, P. R. China
  • Pathmarajah, S. and V.V.N. Murty. (1998) Modelling pesticide transport in lowland rice fields. In: Proceedings of the International Agricultural Engineering Conference, 7-10 December, 1998, Bangkok, Thailand, II: 664-672.
  • Pathmarajah, S. and R.B. Mapa. (1990) Changes in soil physical properties along a Reddish Brown Earth soil catena: A challenge for irrigation planning. In: Gunawardena, E. R. N. (Ed.), Irrigation and water resources, Proceedings of a symposium, 24 - 25 August, 1990, Kandy, Sri Lanka, 40-45
Editorial Work
  • Dhayawansa, N.D.K, Pathmarajah, S. and R.P. De Silva (2012). Water resources research in Sri Lanka. Symposium proceedings of the water professionals' day. 01 October 2012, Peradeniya, Sri Lanka.
  • Pathmarajah, S., Jinadasa, S. and M.I.M. Mowjood (2012). Urban lake monitoring and management. Proceedings of an international symposium., 18 May 2012, Peradeniya, Sri Lanka.
  • Dhayawansa, N.D.K, Pathmarajah, S. and M.I.M. Mowjood (2009). Water resources research in Sri Lanka. Symposium proceedings of the water professionals' day. 01 October 2009, Peradeniya, Sri Lanka.
  • Pathmarajah, S and M.I.M. Mowjood. (2009). Progress and prospects on water supply, sanitation and wastewater management: Towards clean and healthy society. Proceedings of a symposium. 23 June 2008, Peradeniya, Sri Lanka.
  • Pathmarajah, S and M.I.M. Mowjood. (2006). Development Initiatives in Water Sector: Lessons learnt by NGOs". Proceedings of a symposium, 29 November 2006, Peradeniya, Sri Lanka.
  • Pathmarajah, S. (2003). Use of groundwater for agriculture in Sri Lanka. Proceedings of a symposium, 30 September 2002, Peradeniya, Sri Lanka.