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Mass density of the current flows is the one of the important problem in the hydraulics of the dam reservoir.Plunge point occurs when the mass density current penetrates in the stagnant fluid.Recognition the place of this point is very important because of clearing the boundary of the density current flow and ambient fluid.In this study the influences of bed slope and hydraulic parameters on plunging depth were experimentally investigated.The results show that the slope has a minor effect on the plunging depth.The height of plunging depth is increased by increasing the density of the current flow.Also increasing the densimetric Froude number caused of decreasing the plunging depth.Finally an equation was proposed to estimate the plunging depth using as function of flow characteristics.