The measured velocity field and free surface profile of flow for two different discharges over a spillway model are used for validation purpose of the two-dimensional computational results of the same flow cases. The governing equations of the spillway flows are numerically solved using Finite Volume Method. The turbulence closure models; Standard k-, Renormalization Group k-, Realizable k-, Modified k-, Shear Stress Transport and Reynolds Stress Model are used in the numerical simulation

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... d the flow profiles are computed using Volume of Fluid (VOF) method. The testing of the numerical results for grid-independent numerical solution is carried out using a GCI analysis. The comparisons of the computed and experimental results for both cases show that the numerical results from the Realizable k-ε model is more successful in predicting the velocity field and free surface of the spillway flow. smooth, rectangular spillway channel of 0.20 m wide, 0.20 m deep and 1.80 m long.