1. Associate Professor, Water Engineering and Management Program, School of Civil Engineering, Asian Institute of Technology, P.O. Box 4, Klong Luang, Pathumthani 12120, Thailand.
2. Lecturer, Dept. of Agricultural Engineering, Faculty of Agriculture, Univ. of Peradeniya, Peradeniya, Sri Lanka.
3. Adjunct Associate Professor, Water Engineering and Management Program, School of Civil Engineering, Asian Institute of Technology, P.O. Box 4, Klong Luang, Pathumthani 12120, Thailand.