The work of the spillway variant No. 2 of the Boguchanskaya HPP (GES) with a smooth drain face with a jump-bucket for jet discharge into the lower pond is considered. The disadvantage of the Boguchansky dam layout with a spillway No. 2 is its close adjoining to the HPP building and the absence of the separation wall between them preventing from the influence of its operation on the work of HPP. One of the ways to reduce this influence is to remove the left border of the discharge fl ow from the HPP water area. To implement this task there is considered a variant with a planned deviation of the jet of the first span of spillway No. 2 to the right, in the direction of spillway No. 1. For this purpose, the end section of the left wall of spillway No. 2 in the plan is made as curved, and the jump-bucket is stepped, which could make it possible to more effectively control the planned trajectory of the jet of the first span. In the zone of the maximum rise of the jet of the 1st span its deviation from the rectilinear trajectory was equal to its width. At the same time, there was studied the effect of priority gate opening to the soil erosion depth downstream, for which tere were conducted two cycles of erosion: at opening the gates from the first to the fifth and in the reverse order. The specific design of the surface spillway No. 2 is its placement on the end section of the base with large blocks of fractured rock coming to the surface with a gentle falling angle towards the upstream. Behind the site with large-block blocks there is an array with medium – and small-block blocks, covered in the channel part with sediments with a diameter of 0.3 m or less. Modeling of the foundation soil was performed with crushed stone material, the size of which was selected by modeling the erosion rate of the natural material.