1. Dept. of Civil, Environmental, and Natural Resources Engineering, Luleå Univ. of Technology, 97187 Luleå, Sweden; Dept. of Building and Construction Engineering, Univ. of Technology, Baghdad, Iraq (corresponding author).
2. Dept. of Biological and Agricultural Engineering, North Carolina State Univ., Campus Box 7625, Raleigh, NC 27695.
3. William Neal Reynolds Professor and Extension Specialist, Dept. of Biological and Agricultural Engineering, North Carolina State Univ., Campus Box 7625, Raleigh, NC 27695.
4. Professor, Dept. of Civil, Environmental, and Natural Resources Engineering, Luleå Univ. of Technology, 97187 Luleå, Sweden.
5. Senior Lecturer, Dept. of Civil, Environmental, and Natural Resources Engineering, Luleå Univ. of Technology, 97187 Luleå, Sweden.