Razzak Al- Husseini, Thulfikar. “ESTIMATION OF MANNING’S ROUGHNESS COEFFICIENT FOR AL-DIWANIYA RIVER”. Journal of Engineering and Sustainable Development 19, no. 4 (July 1, 2015): 170–184. Accessed April 20, 2025. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/750.