• Participated as Chairman for Technical session & presented a technical paper in the International Water Association (IWA): Water Development Congress and Exhibition 2019 in Colombo, Sri Lanka during 1st - 5th December 2019

• Participated in the International Water Association (IWA) Governing Assembly in Lisbon, Portugal during 2nd - 6th October 2019

• Delivered a keynote address in the 2nd International Conference on Environmental Geotechnology, Recycled Waste Materials, and Sustainable Engineering (EGRWSE 2019), USA, during 16th - 20th June 2019

• Participated as a speaker in the International Water Association (IWA): World Water Congress and Exhibition in Tokyo, Japan, during 16th – 21st September 2018

• Visited University of Reno, USA and University of Illinois, Chicago, USA for discussion on Collaborative Research Programs, during June - July 2018

• Visited Bradley University, USA for discussion on Collaborative Research Programs, during July 2018

• Visited Delft University of Technology, The Netherlands for discussion on Collaborative Research Programs, during May 2018

• Visited International Water Management Institute (IWMI), Colombo, Sri Lanka for discussion on Collaborative project work, during 21st - 27th July 2017

• Visited University of Illinois, Chicago, USA for discussion on Collaborative Research Programs, during May 2017 - June 2017

• Participated & presented two technical paper in the International Conference on Environmental Science and Technology, Houston, USA, during 6th -10th June 2016

• Visited University of Arizona State University, USA and University of Illinois, Chicago, USA for discussion on Collaborative Research Programs, during December 2015 to January 2016

• Visited University of Nottingham, Malaysia to evaluate the Thesis on “Assessment of Climate Change Impact on Runoff and Peak Flow – A case study on Upper Klang Watershed in West Malaysia” submitted by Mr. Reza Kabiri” as an examiner for conducting the Viva-Voce examination during 5th - 7th December 2013

• Visited UNESCO-IHE Institute for Water Education, DA Delft, The Netherlands to attend a Ph.D. Public Viva-Voce Examination as an external examiner & also for discussion on Collaborative Academic and Research Activities at the institute from 30th April - 5th May 2013

• Visited University of Nebraska, Lincoln, USA and University of Illinois, Chicago, USA for discussion on Collaborative Research Programs, during 30th Nov - 9th Dec 2012 on GIS Based Slum Development including Data Mining, and Landfill Contaminant Transport, respectively

• Participated & presented one technical paper in the International Workshop AUTODESK UNIVERSITY, Las Vegas, USA, during 25th -29th November 2012, at Hotel Mandalay Bay, Las Vegas, USA

• Participated & presented two technical papers in the International Workshop on Climate Change and DIMS Technology in association with University of Nottingham, Kuala Lumpur, Malaysia during 1st - 3rd December 2010, at Hotel Royal Chulan, Kulalumpur, Malaysia

• Visited University of Nottingham (Malaysia campus) during December 2010 for discussion on a collaborative project on Water Management, at Kuala Lumpur, Malaysia

• Participated in the International Symposium on TVET Skills for Poverty Alleviation, Manila, Philippines during 2nd - 6th August 2010

• Visited Environmental Engineering Laboratory for Solid waste Management, INSA, Lyon France, January 2009 to April 2009 for a collaborative research project

• Visited Laboratory for Water Resources and Environment, Department of Civil Engineering, Hong Kong University of Technology, Hong Kong SAR, during April 2009 and delivered a speech on “Genetic Algorithms Applications in Water Resources”, during the visit apart from collaborative research project

• Participated and presented a paper in the International Conference on Environmental Management, held at the International Islamic University, Malaysia, during 17th -19th July 2008

• Conducted a one-week training programme on “Theory & Practice of Wastewater Management” for the practicing engineers from Govt. Departments, Sultanate of Oman at Caledonian College of Engineering, Muscat, during 26—31st May 2007

• Participated in the INDO-FRENCH Conference on Water and Wastewater Treatment Technologies, at INSA Lyon, Villeurbanne, France, during 28th November and 2nd Dec 2006

• Participated in the 2nd International Conference on “Artificial Intelligence: Applications and Innovations”, Beijing, China, during Sept 2005

• Participated in the 30th WEDC International Conference on “People-Centered Approaches to Water and Environmental Sanitation” at Vientiane, Laos during October 2004

• Visited Loughborough University, UK during July 2004 for a collaborative research project

• Visited Ecole Polytechnique Switzerland, Lausanne during July 2004 in connection with the PG Certificate Course on “Technology and Sustainable Development”

• Visited Ecole Polytechnique Switzerland, Lausanne during Feb 2003 - July 2003 for a collaborative research project

• Visited University of Putra, Kula Lumpur, Malaysia, during March 2003 on an academic assignment

• Visited Hydro Control, Italy in connection with the European Commission Sponsored Research project, during Mar - Apr 2002

• Visited Hydraulic Research, Wallingford, UK, in connection with the European Commission Sponsored Research project, during Jun - Aug 2000

• Visited Hydro Control, Italy in connection with the European Commission Sponsored Research project, during July - Aug 1999

• Visited Hydraulic Research, Wallingford, UK, in connection with the European Commission Sponsored Research project, during Jun - Aug 1998

• Participated in the International Conference on Reservoir Sedimentation at Colorado State University, Fort Collins, Colorado, USA, during Sept 1996

• Study visit to University of California, Davis, USA, during Oct - Nov 1994

• Collaborative Research works at Cornell University, Ithaca, New York, during Jan - Dec 1994, with Prof. D. P. Loucks

• Research work at Ruhr-University, Bochum during May - Aug1993 under DAAD Fellowship

• Visited Technical University of Aachen, during Aug 1993 in connection with a collaborative research work

• Study visit to University of Colorado, Denver, University of Colorado at Boulder and Colorado State University during June 1993

• Participated in the International Conference on Computer Applications in Water Resources, Taiwan, ROC during July 1991