1 IHE Delft Institute for Water Education, Water Supply, Sanitation and Environmental Engineering, 2601, DA, Delft, the Netherlands. Electronic address: e.raj@un-ihe.org.
2 Department of Environmental Engineering, Kasetsart University, 50 Phaholyothin Rd., Ladyao, Jatujak, Bangkok, 10900, Thailand.
3 School of Engineering, RMIT University, Melbourne, VIC, 3000, Australia.
4 Environmental Engineering and Management Program, School of Environment, Resources and Development, Asian Institute of Technology, P.O. Box 4, Klong Luang, Pathumthani, 12120, Thailand.