1 River Engineering and Urban Drainage Research Centre (REDAC), Universiti Sains Malaysia, Engineering Campus, Nibong Tebal, Penang, Malaysia. ghw.red007@gmail.com.
2 River Engineering and Urban Drainage Research Centre (REDAC), Universiti Sains Malaysia, Engineering Campus, Nibong Tebal, Penang, Malaysia.
3 Discipline of Civil Engineering, School of Engineering, Monash University Malaysia, 47500, Bandar Sunway, Selangor Darul Ehsan, Malaysia.
4 Jacobs' Water Scotland team, Jacobs UK Ltd, Edinburgh, UK.