1. Associate Professor, Dept. of Civil Engineering, Univ. of Hong Kong, Pokfulam Rd., Hong Kong, China (corresponding author). E-mail: xlia@hkucc.hku.hk
2. PhD Student, Dept. of Environmental Science & Engineering, Tsinghua Univ., Beijing, China.
3. Deputy Manager, The Macao Water Supply Co., Ltd., SAAM, Macau, China; formerly, Research Associate, Dept. of Civil Engineering, Univ. of Hong Kong, Pokfulam Rd., Hong Kong, China.
4. Assistant Professor, Dept. of Ecology and Bio-diversity, Univ. of Hong Kong, Pokfulam Rd., Hong Kong, China.
5. Research Associate, Dept. of Civil Engineering, Univ. of Hong Kong, Pokfulam Rd., Hong Kong, China.
6. Assistant Engineer, Environmental Protection Department, Hong Kong SAR Government, Hong Kong, China; formerly, Final-Year Student, Dept. of Civil Engineering, Univ. of Hong Kong, Pokfulam Rd., Hong Kong, China.