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We studied a scour in a drainage canal of the Cheboksary hydrosystem tailrace on the Volga river. To protect the hydrosystem tailrace from scouring, we proposed flexible stream-guiding grids that are installed in the stream and effectively affect its kinematics in the bottom area. We calculated in MathCad a system of vortices that occur when the flow runs against adjacent plates of a grid. Due to the replacement of flexible elements of a grid with flat plates that divide the flow into separate jets, it became poss...