In this study, characteristics of forced B-jumps in stilling basins of an ogee weir with a continuous sill at the toe of the weir and also with two continuous sills at the weir toe and in the jump are investigated. Experiments with one continuous sill showed that by increasing the sill or by decreasing the sill location from the toe of the sill, absorption of the energy is high and consequently the sequent depth ratio decreases; also the relative roller length decreases and the energy loss increases. Observation of the flow over the sill showed that flow can divided into four group as: 1) free jump, 2) undular jump, 3) submerged jump and 4) submerged jump with some rollers at the bed zone after the sill. In these experiments, by moving the toe of the jump to the higher elevation of the weir, effect of sill on decreasing the sequent depth ratio was diminished and because of the bed roller formation after the sill, length of the jump roller was also notably decreased. Using two same continuous sills in the jump formation showed that the effect of second sill on the hydraulic characteristics of the jump is not notable. In other words, the second sill does not play a roll on the main characteristics of the jump. Based on the momentum equation in the horizontal direction, a semi-theoritical equation for the predicting the sequent depth ratio is presented. Using the energy equation and dimensional analyzes, the roller length ratio is also estimated. The presented methods agree well with the results of the experiments.