Spillways are hydraulic structures that are used in flood mitigation operations, river engineering, soil conservation, and water management to remove excess kinetic energy of flood water downstream of the dam. It has become evident over the years that flooding can destroy dam structures due to overtopping, hence it becomes essential to mitigate the effects of flooding over structures by ensuring water can flow freely. The effectiveness of energy dissipation from quickly varying cascades is improved by steps supplied above spillways. In this study, the volume of fluid (VOF) method and the CFD methodology is used to model flow over a stepped spillway and resolve the dynamics of the free surface flow. A stepped spillway having a total height of 30 cm is considered for all four experimental models. For those three experimental models the threader (horizontal) of steps is considered as uniform and the riser (vertical) is considered as non-uniform. Six different discharges ranging from 450 to 7600 cm3/s were passed over each model. Results are compared with uniform conventional stepped spillway, and it is noticed that the non-uniform stepped spillway reduced more kinetic energy when compared with the uniform stepped spillway. Generally, relative energy loss for non-uniform stepped spillway is reported 3–4% higher than for uniform stepped spillways. A good agreement in results is also established with the past studies.