Change in flow regime from subcritical to supercritical flow or opposite can be met during a dam break flow propagation but also during floods in urban areas. In this latter case, flow regime change often occurs in or near crossroads. Such situation was produced in laboratory with the aim to obtain a region in which Froude number is close to one. Detailed laboratory measurements of flow discharge distribution and flow depths are carried out for transcritical dividing flows in a 90° sharp-edged, rectangular junction formed by horizontal open-channels of equal width. The experimental results obtained by the authors are used to verify the accuracy and the robustness of a two-dimensional (2-D) depth-averaged model. A sensitivity analysis to three parameters (friction coefficient, diffusion coefficient and downstream boundary condition) is carried out in order to assess the performance of some possible sets of parameters. The resulting uncertainty is investigated for both the water elevation in the vicinity of the cross road and the flow distribution between the two downstream branches. Beyond the convenient results that are obtained with the 2-D modeling, the suitability of the equations and the accuracy of the numerical are discussed, particularly with regards to the location and amplitude of the hydraulic jumps.