In this study, the effect of positive step located at the end of the stilling basin (end step) and baffle block on the flow characteristics downstream the radial gate of the Assuit Barrages physical model was investigated. These characteristics include the main parameters of the submerged hydraulic jump, the vertical velocity distribution along the bed, the velocity decay, and the stability of bed protection downstream the apron of the stilling basin. Three different shapes of the end step and five different shapes of baffle block were tested. The physical model was built at the Hydraulics Research Institute, Delta Barrage, Egypt. The used flume has 1.0 m wide, 26.0 m long and 1.20 m deep. The flume side walls are made of glass with steel-frames to allow visual investigation of the flow patterns and stability of bed protection. Different designs of sluiceway stilling basin are examined to obtain a near optimum stilling basin design which gives the best velocity distribution along the stilling basin, minimum velocity near the bed, minimum scouring potential, the shortest length of submerged hydraulic jump, efficient energy dissipation, study characteristics submerged hydraulic jump and the stability of river bed protection. The study carries out in case submerged hydraulic jump takes place downstream the gate.