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Mr. Susantha Wanniarachchi

Senior Lecturer

Faculty of Engineering | Civil Engineering

Career Summary

  • Susantha Wanniarachchi is a researcher in Water Resources Engineering. Currently, he is a Senior lecturer in Civil Engineering in Faculty of Engineering, Sri Lanka Institute of Information Technology, Malabe, Sri Lanka.


  • B.Sc Eng. (Hons) in Civil Engineering, University of Moratuwa, Sri Lanka, 2010.
  • M.Phil. in Stormwater Management, University of Moratuwa, Sri Lanka 2019


Best paper award – Wanniarachchi S.S, Wijesekera N.T.S, Mathematical Modeling of Watershed Runoff Coefficient for Reliable Estimations to meet the future challenges of water resources development in Sri Lanka, Engineer, Vol 46, No2, pp59-68, 2013. (IWMI AWARD-UNDER 35 YEARS, First Place)

Research Interests and Memberships

Research Interests

  • Hydrology & Hydraulics and Water management
  • Irrigation Engineering




Ongoing Research

  • Baseflow separation in Kelani river basin at Hanwella using recursive digital filter calibrated with the concave method
  • Mathematical modelling of watershed runoff coefficients with graphical baseflow separation
  • Analysis of landuse pattern change impact on runoff generation in Malabe-Athurugiriya area
  • Conductivity based baseflow estimation in Thalangama canal
  • Assessment of the effectiveness of floating aquatic plants on evaporation reduction in reservoirs
  • Effect of slope prediction methods on rainfall-runoff estimation
  • Determining Stormwater Contaminant Sources at the SLIIT
  • Investigation of stormwater contaminant distribution within an urban catchment
  • Geotechnical Analysis of Hydraulic Properties of Substrates for Engineered Treatment Wetlands 
  • Analyse the effect of the criterion for rainfall event separation Development of Stormwater Management Model for SLIIT campus, Malabe
  • Analysis of the climate change impact on temporal variation of Monsoon rainfall in Sri Lanka
  • Analysis of the antecedent wetness relationship with the initial abstraction ratio


My Publications

Journal Publications

  • Khaniya B, Wanniarachchi S, Rathnayake U  " Importance of Hydrologic Simulation for Lids and BMPs Design Using HEC-HMS: A Case Demonstration "  International Journal of Hydrology,  vol.5,  Issue 00027,  2017,        
  • S. Wanniarachchi, N.T.S. Wijesekera  " Mathematical Modelling of Watershed Runoff Coefficient for Reliable Estimations to meet the Future Challenges of Water Resources Development in Sri Lanka "  ENGINEER,  vol.46,  Issue 02,  2013,  pp.59-68,      
  • S. Wanniarachchi, N.T.S. Wijesekera  " Using SWMM as a Tool for Floodplain Management in Ungauged Urban Watershed "  ENGINEER,  vol.45,  Issue 01,  2012,  pp.1-8,      
  • S.S.Wanniarachchi, N.T.S.Wijesekera  " Challenges in field approximations of regional scale hydrology "  Journal of Hydrology Regional Studies,  vol.Volume 27,  Issue 100647,  2020,,

Conference Proceedings

  • D. Senadeera, S. Wanniarachchi, U. Rathnayake   RAINFALL ANALYSIS IN UMA OYA BASIN, SRI LANKA  in International Research Symposium on Engineering Advancements 2016 (IRSEA 2016),  year 2016,  SAITM,    SAITM,    June 2016,  
  • B. Khaniya, S. Wanniarachchi, U. Rathnayake   Sustainable stormwater management system: A conceptual design model for SLIIT, Malabe campus, Sri Lanka  in International Research Symposium on Engineering Advancements 2016 (IRSEA 2016),  year 2016,  SAITM,    SAITM,    June 2016,  

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