Experimental data of laboratory experiments of a channel bifurcation: a main and a lateral diversion channel, both with mobile bed, rectangular cross-section, performing a 90º angle between them. Experiments run until the equilibrium bed was reached. 4 experiments: (i) no vanes - NV; (ii) with a vane-field - VF; (iii) with a second vane-field configuration with the alignment of the vanes (angle beta) = 30º - VF30; (iv) with the same vane-field configuration as (iii) but with angle beta = 10º - VF10. Water depth at the downstream end of the main channel is equal to 0.10 m. Width of the main channel = 0.68 m in (i)-(ii), and 0.67 in (iii)-(iv). Width of the diversion channel = 0.26 m in (i)-(ii), and 0.25 in (iii)-(iv). Discharge at the entrance of the main channel = 29 l/s. Discharge ratio per unit width of the channels: 0.5 in (i)-(ii), and 0.2 in (iii)-(iv). Height of the vanes = 0.03 m above the average bed level of the approach flow. Data measured provided for each experiment: (i) profiles along direction x of the water surface levels and the bed topography; (ii) average values and fluctuations of the 3 components of velocities at a dense grid of points (see figures with the plan views of the measured grid). In the vertical direction z, the points are spaced in 0.5 cm or 1 cm. All the data was measured for the equilibrium bed. The velocities were measured with a side-looking Vectrino. Data was despiked (see Goring and Nikora, 2002 DOI 10.1061/(ASCE)0733-9429(2002)128:1(117) ), and points with correlation < 70% or SNR < 15 db were discarded. For further information see: Baltazar, J.; Alves, E.; Bombar, G.; Cardoso, A.H. Effect of a Submerged Vane-Field on the Flow Pattern of a Movable Bed Channel with a 90º Lateral Diversion. Water 2021, 13, 828. https://doi.org/10.3390/w13060828 PhD thesis "Sediment control at lateral water intakes through submerged vane-fields", by Joana Baltazar (Instituto Superior Técnico, Lisbon, Portugal)