In finite volume SIMPLE algorithm a collocated data structure causes numerical oscillation in pressure field. When SIMPLE algorithm is utilized, the discretized 2D and 2D depth averaged equations have the same forms. In a 2D depth averaged simulation, the pressure field is identical to water surface elevation and, in turn, an oscillation in pressure field cusses an oscillation in water surface elevation. To date, the Rhie and Chow’s pressure interpolation technique is the only affordable method in order to have a smooth pressure field and the relevant water surface elevation. The main argument is, whether the Rhie and Chow’s pressure interpolation technique is successful enough for 2D depth averaged simulations or not. Results of present research reveal that the checkerboard oscillations are more significant at higher Reynolds numbers, and they cannot be adequately removed by Rhie and Chow’s pressure interpolation technique.