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The importance of Computational Fluid Dynamics (CFD) codes in modelling of the processes in various engineering systems, including those related to irrigation and drainage is well recognized [1]. The range of problems to which these codes can be applied and the reliability of their predictions, however, are still far from clear to the engineering community, although the developments of these codes led to their application to new fields, including modelling of magneto hydrodynamic processes and the processes in rarefied gases [2,3]. At first sight the main problem here lies in the limitations of the available computer power, and application of direct numerical simulations could make the predictions of these codes almost 100% reliable. This could be potentially achieved only in the case when we are able to determine very accurately all initial and boundary conditions. This is obviously not possible in most realistic engineering systems.