1. Associate Professor, Institute of Environmental and Water Studies, Birzeit Univ., PO Box 14, Birzeit, West Bank, Palestine (corresponding author).
2. Assistant Professor, Institute of Environmental and Water Studies, Birzeit Univ., PO Box 14, Birzeit, West Bank, Palestine.
3. Assistant Professor, Dept. of Civil Engineering, Faculty of Engineering, Birzeit Univ., PO Box 14, Birzeit, West Bank, Palestine.