Abstract: The invention refers to a hydrokinetic unit which allows a high level exploitation of the energetic potential of rivers in the plain regions, where the flat relief does not allow to build dams or culverts and which is destined to convert the kinetic energy of flowing waters into useful mechanical energy for producing electric energy or for pumping water by using such modular hydrokinetic assemblies equipped with generators or pumps. The hydrokinetic unit according to the invention comprises a threshold (1) of a constant level provided with flaps (2) and two catching connectors (3) with protection grids (4) and, one or more connections (5) with the flaps which regulate the water flow rates necessary for driving the modular hydrokinetic assemblies (6), connected to the catching connector (3) and, which may be equipped with electric generators or water pumping groups.