A. Al-Delewy, Abdul-Hadi, Abdul-Hassan K. Al-Shukur, and Atheer Z. M. Al-Qaisi. 2008. “Optimum Safe Hydraulic Design of Culverts”. Journal of Engineering and Sustainable Development 12 (1): 66-88. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1637.