1. Water Research Center, Institute of Research Management and Monitoring, University of Malaya (UM), Kuala Lumpur, Malaysia
2. Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea, Tel. ; Fax:
3. National Urban Disaster Prevention Research Center, Land Management and Urban Research Division, Korea Research Institute for Human Settlements (KRIHS), Anyang, Republic of Korea
4. Department of Environmental Engineering, Kwangwoon University, Seoul, Republic of Korea