1. Senior Lecturer, Faculty of Agricultural Engineering, Technion–Israel Institute of Technology, Haifa 32000, Israel (corresponding author). E-mail: agori@tx.technion.ac.il
2. MSc Student, Dept. of Civil Engineering, Univ. of Cape Town, Rondebosch 7700, South Africa.
3. Senior Lecturer, Faculty of Agricultural Engineering, Technion–Israel Institute of Technology, Haifa 32000, Israel. E-mail: aguri@tx.technion.ac.il
4. Associate Professor, Dept. of Civil Engineering, Univ. of Cape Town, Rondebosch 7700, South Africa. E-mail: dick@eng.uct.ac.za