1. Department of Civil Engineering, Faculty of Engineering, Al-Azhar University, Cairo 11651, Egypt
2. Department of Civil Engineering, Faculty of Engineering, Ain Shams University, Cairo 11241, Egypt
3. Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland
4. Water Pollution Research Department, National Research Centre, 33El-Bohouth St. (Former El-Tahrir St.), Dokki, P.O. Box 12622, Giza 12622, Egypt