1. Associate Professor, Institute of Environmental and Water Studies, Birzeit Univ., P.O. Box 14, Birzeit, West Bank, Palestine (corresponding author).
2. Assistant Professor, Head, Applied Statistics Master Program, Birzeit Univ., P.O. Box 14, Birzeit, West Bank, Palestine.
3. Professor, Dept. of Civil Engineering, Birzeit Univ., P.O. Box 14, Birzeit, West Bank, Palestine.