1. a Coastal and Catchment Policy, Co-ordination and Management, Engineering Unit , eThekwini Municipality , PO Box 680, Durban , 4000 , South Africa
2. b Department of Geography and Urban Planning , University of the United Arab Emirates , Al Ain , UAE
3. c School of Environmental Sciences , University of KwaZulu-Natal , Durban , 4041 , South Africa
4. d School of Civil Engineering , University of KwaZulu-Natal , Durban , 4041 , South Africa