Faculty of Agriculture

University of Peradeniya

Prof. E.R.N.Gunawardena

Senior Professor



Official Address :

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


Email :

nimalgun@pdn.ac.lk


Telephone :

+94 81 239 5455


Personal Website :






  • PhD (Soil and Water Engineering), Cranfield University, UK
  • MSc (Soil and Water Engineering), Cranfield University, UK
  • BSc (Agriculture), University of Peradeniya, Sri Lanka
  • Fulbright Fellowship, USA
  • Soil and Water Engineering
  • Integrated Water Resources Management
Journal Papers - Selected papers after 1990
  • Atputhanathan, C.S., E.R.N.Gunawardena and K.R.Rushton (1991). Soil water dynamics related to waterlogging in a sloping catchment. Journal of Hydrology (Vol. 123). 279-295.
  • Palitha, W., and E.R.N.Gunawardena (1992). Development and testing of a soil moisture deficit indicator for irrigation scheduling. Tropical Agricultural Research, Vol. 4, 327-338.
  • Gunawardena, E.R.N. (1993). Irrigation scheduling for non-paddy crops in large irrigation schemes with small field plots. Agricultural Engineering, Vol. 5. 1-8.
  • Thiruchelvam, S., P.Abeygunwardena and E.R.N.Gunawardena (1994). An economic analysis of ground water use for agriculture in Jaffna district. Tropical Agricultural Research Vol. 6. 114-122.
  • Hall, R.L., Calder, I.R., Gunawardena, E.R.N. and Rosier, P.T.W. (1996). Dependence of rainfall interception on drop size: 3. Implementation and comparative performance of the stochastic model at a tropical forest site in Sri Lanka". Journal of Hydrology (185) 389-407.
  • Gunatilake, H.M. and E.R.N.Gunawardena. (1999). An assessment of on-site and off-site cost of soil erosion in the Upper Mahaweli Watershed. Sri Lankan Journal of Agricultural Sciences, Vol.37, 103-134.
  • Navaratne, W.M.U. and E.R.N.Gunawardena. (1999). Verification of design parameters for operational studies of minor tanks in the Dryzone. Tropical Agricultural Research Vol. 11, 1-18.
  • Jayakody, B.V.P.L, M.I.M.Mowjood and E.R.N.Gunawardena. (2004).Modifying and testing of a cascade water balance model using a mini cascade system with two tanks. Tropical Agricultural Research (16), 159-170.
  • Thrikawala, S., L.H.P.Gunaratne and E.R.N. Gunawardena (2008). Impact of Different Tariff Structures on Residential Water Demand: a Case Study from Kandy, Sri Lanka. Tropical Agricultural Research, Vol. 20. pp. 60-72.
  • M.I. Sudasinghe, L.W. Galagedara, E.R.N. Gunawardena. 2011. Performance evaluation of selected sewerage treatment plants (STP) in Sri Lanka. Tropical Agricultural Research 2(2): 154-164.
  • S.S.K. Chandrasekara and E.R.N. Gunawardena. 2011. Effectiveness of Existing Laws and Regulations to Prevent Encroachments of Stream Reservations. Tropical Agricultural Research 2(2): 134-143.
  • Mimrose, D.M.C.S., Gunawardena, E.R.N., Nayakakorala, H.B. (2011). Assessment of Sustainability of Community Water Supply Projects in Kandy District. Tropical Agricultural Research Vol. 23 (1): 51 - 60
Conference Papers - Proceedings of National Conferences
  • Proceedings of National Conferences
  • Gunawardena, E.R.N. (1995). "Impact of landuse conversions on water yield". In:Forestry for Development: Proceedings of the Annual Forestry Symposium (Ed: H.S.Amarasekere and S.G.Banyard). Dept. Of Forestry and Environmental Science, University of Sri Jayawardenapura, Nugegoda, Sri Lanka. 13-17.
  • Gunawardena, E.R.N.(1997). Strategies for the improvement of participatory watershed management training. In: Proceedings of the Workshop on Watershed Management. Sri Lankan Forest Department & Participatory Watershed management Training in Asia (PWMTA), GCP/RAS/161/NET. Forest Department, Colombo. 9-20.
  • Gunawardena, E.R.N., I.R.Calder, P.T.W.Rosier and N.Chandrasiri. (1998). Hydrological importance of Horton Plains. In:Proceedings of the final workshop of the University of Peradeniya-Oxford Forestry Institute Link Project (Ed: H.P.M.Gunasena), July 1998. pp: 45-63.
  • Gunawardena, E.R.N. (2000). Assessing the impact of land use conversions on water demand: A pre-requisite for the formulation of policy for water allocation. In: Status and Future Direction of Water Research in Sri Lanka (Eds. M.Samad, N.T.S.Wijesekera and Alfred Birch). International Water Management Institute, Colombo.59-66.
  • Gunawardena, E.R.N. (2001) Pollution of water resources in Sri Lanka with special reference to agricultural pollution. Jubilee publication of the Post Graduate Institute of Agriculture, University of Peradeniya. (Eds. H.P.M.Gunasena, N.Sandaratne and T.Jogaratnam). 116-126.
  • Ekanayake, E.M.T, E.R.N.Gunawardena and L.H.P.Gunarathne. (2004). Status of micro irrigation trade and services by the private sector in Sri Lanka. Water Resource Research in Sri Lanka: Symposium proceedings of the Water Professionals' Day (Ed. Ranjith Premala de Silva), Post Graduate Institute of Agriculture, University of Peradeniya, Sri Lanka. 33.44
  • Ekanayake, E.M.T, E.R.N.Gunawardena and L.H.P.Gunarathne.(2004). Productivity an efficiency of micro irrigation in the dry zone of Sri Lanka. Water Resource Research in Sri Lanka: Symposium proceedings of the Water Professionals' Day (Ed. Ranjith Premala de Silva), Post Graduate Institute of Agriculture, University of Peradeniya, Sri Lanka. 1-12.
  • Ekanayake, E.M.T, E.R.N.Gunawardena and L.H.P.Gunarathne. (2004). Status of micro irrigation trade and services by the private sector in Sri Lanka. Water Resource Research in Sri Lanka: Symposium proceedings of the Water Professionals' Day (Ed. Ranjith Premala de Silva), Post Graduate Institute of Agriculture, University of Peradeniya, Sri Lanka. 33.44
  • Gunawardena, E.R.N. 2008. Watershed Management: The path traversed and the way forward. In: Development in Forestry and Environment in Sri Lanka (Ed:H.S.Amarasekera et al). Proceeding of the Silver Jubilee Conference, 29 December 2008, University of Sri Jayawardenapura, Sri Lanka. 62-71.
  • E.R.N.Gunawardena, Maheesh, M.T.M., Gunawardana, I.P.P., Rathnapriya, E.A.S.K., Amarasekera, M.G.T.S., and Thrikawala, S. 2010. Transdisciplinary research in integrated water resources management in addressing issues related to water pollution in Mahaweli river. In: Water Resources Research in Sri Lanka: Symposium Proceedings of the Water Professional's Day (Ed: N.D.K.Dayawansa and Ranjith Premalal De Silva) Geo-Informatics Society of Sri Lanka. Pp 1-28.
Proceedings of International Conferences
  • Gunawardena, E.R.N., A.Jeyabalasinkham and C.S.Atputhanathan (1990). The use of interceptor drainage technique in alleviating water logging in irrigation systems. In Proceedings of the International Agricultural Engineering Conference and Exhibition (Eds.: V.M.Salokhe and S.G.Illangantileke), Asian Institute of Technology, Bangkok. Thailand. 1015-1024.
  • E.R.N.Gunawardena (1992). Improved water management for paddy irrigation: A case study from the Mahaweli system B in Sri Lanka. In: Proceedings of the International Workshop on soil and water engineering for paddy field management (Eds.: V.V.N.Murty and K.Koga). Asian Institute of Technology, Bangkok, Thailand. 307-316.
  • Gunawardena, E.R.N. (1994). Constraints and solutions for effective water management for non-paddy crops in paddy based irrigation systems. In:Asian Regional Symposium on Maintenance and Operation of Irrigation/Drainage schemes for improved performance. HR Wallignford, UK. 137-145.
  • Gunawardena, E.R.N. (1995). "Rapid assessment of the importance of natural forests for watershed protection". In: Proceedings of the fifth annual American Geophysical Union - Hydrology Days. (Ed. H.J.Morel-Seytoux), Colorado State University, Fort Collins, Colorado. USA. pp: 71-82.
  • Sharma,P.N., B.Mishra, J.Gurang, F.J.Dent, S.H.Achet, J.Escano, H.Gamage and E.R.N.Gunawardena (1996). Participatory processes for integrated watershed management. In: Participatory processes for integrated watershed management. (Ed: Prem N.Sharma) PWMTA-FARM Field Document NO. 7. FAO, Kathmandu, Nepal pp.20-27.
  • E.R.N.Gunawardena (1999). Impact of land use changes on water yield of village tanks in the dryzone of Sri Lanka. In: Regional workshop on traditional water harvesting systems (Eds. N.Talebbeydokhti, A.Telvari and S.A.Heydarian). Ministry of Jihad-e-Sazandegi, Department of Watershed Management, Teheran, Iran. 113-130.
  • Gunawardena, E.R.N., G.U.Weerakkody, I.R.Calder and P.T.W.Rosier (2004). Development and verification of a computer model to simulate hydrological processes in a cloud forest in Sri Lanka. In: Forest and Water in Warm, Humid Asia (Ed: R.C.Sidle, M.Tani, N.Adul Rahim and T. Ayele Tewodros). Proceedings of a IUFRO Forest Hydrology Workshop, 10-12 July 2004, Kota Kinabalu, Malaysia, Disaster prevention Research Institute, Uji, Japan. 73-76.
  • Gunawardena, E.R.N. (2005). Evolution of watershed management. In: Preparing for the next generation of watershed management programmes and Project, ASIA (Eds: M Achouri, L Tennyson, K Upadhayay and R White). Watershed management and sustainable mountain development working paper, Food and Agricultural Organization, Rome. 149-155.
  • Sudasinghe M I., L.W. Galagedera and E.R.N. Gunawardana (2010). Suitability of a centralized sewage treatment plant and associated socio economic perspective of tsunami affected resettled community in Sri Lanka. In: Proceedings of the Regional Conference on Appropriate Water Supply, Sanitation and Hygiene (WASH) Solutions for Informal Settlements and Marginalized Communities. 19-21 May 2010, Kathmandu, Nepal. Pp 141-150
  • S.S.K.Chandrasekera and E.R.N.Gunawardana. 2011. Effectiveness of existing regulatory mechanism and governance to prevent encroachments of river reservations in Sri Lanka. In: Proceedings of the 3rd International Conference on Water and Flood Management (ICWFM 2011), 8-10 January 2011. Institute of Water and Flood Management, Bangladesh University of Engineering and Technology, Dhaka, Bangladesh. Pp 739-749.
Book Chapters
  • Jayakody A.N., Wanigasundara, W.A.D.P., and Gunawardena, E.R.N. (2007). Monitoring and evaluation of soil conservation projects in Sri Lanka. In: Monitoring and evaluation of soil conservation and watershed management projects (Ed: J.D.Graff, J.Cameron, S.Sombatpanit, C.Peiri and J.Woodhill). Science Publishers, USA. 163-178.
  • Van der Zaag, P., B. Gumbo, E.R.N. Gunawardena, S. Khan, N. Kitaka, J. O'Keeffe, E. Rap, S. Uhlenbrook and A.A. van Dam. (2009). Climate, energy and environmental care: Investigating new collaborative research approaches. Chapter 10 in H. Molenaar, L. Box and R. Engelhard (eds), Knowledge on the Move: Emerging Agendas for Development-oriented Research. International Development Publications, Leiden, 195-222.
  • Brij Gopal, Hemasiri Kotagama, and E.R.N.Gunawardena (2012).Ecosystems and Integrated Water Resources Management: The Link and the Need for Integration. In: Ecosystems and Integrated Water Resources Management in South Asia (Ed:E.R.N.Gunawardena, Brij Gopal and Hemasiri Kotagama). Routledge (London and New Delhi). 1-12.
  • Hemasiri Kotagama, E.R.N.Gunawardena, and K.A.I.D.Silva (2012). A conceptual Framework for a National Policy on Financing Watershed Management in Sri Lanka. In: Ecosystems and Integrated Water Resources Management in South Asia (Ed:E.R.N.Gunawardena, Brij Gopal and Hemasiri Kotagama). Routledge (London and New Delhi). 338-364.
  • Thrikawala, S., E.R.N. Gunawardena and L.H.P. Gunaratne (forthcoming). Sustainable urban water supply and sanitation: A case from Kandy, Sri Lanka. In: Globalization of Governance: Implications for Water Management in South Asia (Ed: Vishal Narain, Chanda Gurung Goodrich and Jayati Chourey), to be published by Routledge (London and New Delhi)
  • Gunawardena, E.R.N. (forth coming). Changing configurations around the state in water resource management in relation to multi-stakeholders' participation in South Asia: Possibilities and challenges. In: Globalization of Governance: Implications for Water Management in South Asia (Ed: Vishal Narain, Chanda Gurung Goodrich and Jayati Chourey), to be published by Routledge (London and New Delhi)
Editorial Works
  • Co-Editor of the book on Ecosystems and Integrated Water Resources Management in South Asia
  • Editor of the book on Irrigation and Water Resources
  • Co-editor of the book on Agricultural Education in the Universities: Present status and future directions
  • Chief Editor of Agricultural Engineering Vol.1 1989 and Vol.2 of 1990
  • Member of the editorial panel of Agricultural Engineering, Tropical Agriculturist and Agricultural Sciences Journal
  • Reviewer for the Journal of Soil and Water Conservation and CGIAR e-journal on water management