1. Department of Civil and Environmental Engineering, Faculty of Engineering, The University of Auckland, Auckland 1010, New Zealand
2. School of Built Environment, College of Sciences, Massey University, Auckland 0745, New Zealand
3. School of Environmental Science and Technology, Ardhi University, Dar es Salaam 16103, Tanzania
4. School of Architecture and Built Environment, University of Newcastle, Callaghan, NSW 2308, Australia