The hydraulic jump, B type with negative step in sloping rectangular channel is investigated theoretically and experimentally. A function relationship is defined linking the various parameters which influence the phenomenon. The cinematic and physical characteristics of the jump as its velocities, sequent depths, length, water surfaces and efficiency are analysed. At the negative step start, an undisturbed jet is fully developed caused near the fall of the negative step at very high speeds, which can exceed 150cm/s. In the vortex area, negative speeds are obtained for different cases of slopes studied. The results also show an exponential increase in sequent depth with the increase in the Froude number (F1). The roller relative length (Lr / h1) increases proportionally in a linear fashion with the channel slop increase (θ) and the step height (S). The yield obtained from the jump studied for the entire study range justifies the effectiveness of the forced hydraulic jump B type with negative step in energy dissipation.

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