1. Directorate General of Water Resources, Ministry of Public Works and Housing, Jakarta, Indonesia
2. Islamic Science Research Network, Muhammadiyah University of Hamka, Jakarta, Indonesia
3. Centre for Environmental Sustainability and Water Security, Research Institute for Sustainable Environment, Universiti Teknologi Malaysia, Johor Bahru, Malaysia
4. Department of Environmental Engineering, Faculty of Civil Engineering, Universiti Teknologi Malaysia, Johor Bahru, Malaysia