1. Professor, Dept. of Civil, Environmental and Natural Resource Engineering, Lulea Univ. of Technology, Porson, Lulea 971 87, Sweden (corresponding author).
2. Assistant Professor, Dams and Water Resources Engineering Dept., Univ. of Mosul, Mosul 41002, Iraq.
3. Professor, Dept. of Civil, Environmental and Natural Resource Engineering, Lulea Univ. of Technology, Porson, Lulea 971 87, Sweden.
4. Ph.D. Student, Dept. of Civil, Environmental and Natural Resource Engineering, Lulea Univ. of Technology, Porson, Lulea 971 87, Sweden.