1. Lecturer, Dept. of Water Resources Engineering, Chulalongkorn Univ., Bangkok 10330, Thailand; Dept. of Civil and Environmental Engineering, Imperial College London, London SW7 2AZ, U.K. (corresponding author).
2. Professor, Center for Water in the Minerals Industry, Sustainable Minerals Institute, Univ. of Queensland, Brisbane, QLD 4072, Australia; Dept. of Civil and Environmental Engineering, Imperial College London, London SW7 2AZ, U.K.