The effect of surface roughness (height and spacing) on the hydraulic jump behavior in the downstream section of an Ogee weir, which is a stilling basin, was explored in this research. In line with this, a numerical simulation was performed of the flow patterns and geometric features around the valve is other peak weir by a Fluent software. Results from these computations were compared with experimental data, which was recorded from a real model constructed at Islamic Azad University of Yasuj. The results indicated that a roughness is added to the bed of the channel and has significant impact on the hydraulic jumps and their features. More specifically, the addition of roughness results in shorter jumps and relative secondary depth (of the same order of magnitude). With the increase of the roughness elements height, the relative depth of the secondary to primary decreases. This transition happens as the rough surface affects the flow and shortens the hydraulic jump, reducing the difference between the principal and secondary depths. Moreover, performance of hydraulic jump enhanced with the increase of roughness height. The best-performing spacing and height of roughness elements were found to be 2 centimetres. These findings are essential for engineers and designers engaged in the development of hydraulic structures such as Ogee weirs. It helps them to design systems that provide better energy dissipation and flow control by understanding the effects of roughness on hydraulic jump behaviour. An example of where this could be leveraged would be using correctly-sized roughness elements in MVSP channels to enable most efficient and compact structure thus reducing construction costs without compromising, and in some cases enhancing, function. Therefore, this study proves momentous for the better understanding of the effects of surface roughness on the phenomenon of hydraulic jumps, offering practical implications for hydraulic systems design and optimization.