1. Researcher, Channel Maintenance Research Institute, National Water Research Center, P.O. Box 13621, Kalubia, Egypt (corresponding author).
2. Professor, Faculty of Engineering, Irrigation and Hydraulics Div., Al-Azhar Univ., Cairo, Egypt.
3. Associate Professor, Channel Maintenance Research Institute, National Water Research Center, P.O. Box 13621, Kalubia, Egypt.