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In this paper, impinging water jets on a moving surface has been numerically studied to investigate flow behavior in a realistic range of ROT processes. The 3-D k-epsilon Reynolds Averaged Navier Stokes model features a second-order accurate discretization and the VOF method with High Resolution Interface Capturing scheme to handle the free surface flow and was implemented in Fluent 6.2.16. The model accurately predicted the free-surface shape in a verification problem of a single impinging water jet experiment using a volume fraction of 0.2 to define the free surface. The velocities, free surface shape, and pressure on the moving surface were calculated for various flow rates and strip widths. The results show that increasing flow rate over 2,400 L/min/m2, causes a deep water pool to accumulate on the moving surface. The water pool depth increases with increasing strip width and increasing flow rate. It was also found that the pressure peak below each water jet decreases as the water pool height increases. Based on the similarity in drainage flow behavior of the present problem with open-channel flow over a dam, a simple equation was derived to predict pool height from the water flow rate, nozzle spacings, and strip width. Pool height predictions using the simple equation agree well with those of water model experiments as well as the 3-D computations. The flow results have important implications for heat transfer in ROT processes, which are discussed briefly in preparation for further work.