1. Prof. and Head, Div. of Envir. and Water Resour. Engrg., School of Civ. and Struct. Engrg., Nanyang Technol. Univ., Nanyang Ave., Singapore 639798.
2. Res. Assoc., Div. of Envir. and Water Resour. Engrg., School of Civ. and Struct. Engrg., Nanyang Technol. Univ., Nanyang Ave., Singapore 639798.
3. Tech. Mgr., SembCorp Utilities and Terminals Pte. Ltd., 51 Sakra Ave., Singapore 627894.