The bottom outlet is a series of structures that are used to transfer water from the dam reservoir to the downstream. The purpose of the present study was to numerically and experimentally investigate the Froude number in the bottom outlet channel. In this research, the physical model of conduit and gates constructed in the laboratory of the Soil Conservation and Water Management Research Institute (SCWMRI) was applied, and the necessary tests were performed. The numerical model of the discharger was simulated using the Flow 3-D software and the experimental and numerical results were compared with each other, and also, the previous results were compared in this research. Based on the obtained results, the change of Froude number at different heads was similar. The rate of change in the initial openings was high, and the intensity of the changes increased with the increase of the reservoir head. Then, the Froude number decreased with increasing opening, and after the 50% opening, it tended to be linear with almost identical slopes at different heads.
