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Reservoir sedimentation is a major problem experienced by reservoirs in Indonesia. Sedimentation of reservoirs can be overcome by reducing the amount of sediment that enters the reservoir, among others by building Check dam. Check dam deposits more sediment loads with coarse grains, while sediment loads with fine grains will escape and enter the reservoir. So it is necessary to have construction to hold and settle fine sediment loads downstream of the Check dam. Constructions are planned like a sediment trap in irrigation system with variations on the cross-sectional area. This is because the settling velocity of sediment particles is inversely proportional to the cross-sectional area of the channel. The wider the cross-sectional of the channel then sediment will settle faster. In this study, the cross-section was expanded by changing its depth with three depth variations. The purpose of this research is to determine the effect of changes in the channel depth on sediment deposition that occurs. The calculation is done using the HEC-RAS software. Simulation results show the addition of sedimentation to the addition of the channel depth. To get optimal results to need to be combined with other variations.