“Modeling of Porosity Equation for Water Flow Through Packed Bed of Monosize Spherical Packing”, J. eng. sustain. dev., vol. 15, no. 4, pp. 205–226, Dec. 2011, Accessed: May 19, 2024. [Online]. Available: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1320