The present invention refers to a hydromechanical device arranged to be provided in a streaming water (w) for generating power. A first inlet conduit (1) is arranged to convey a first flow of water. A second inlet conduit (2) is arranged to convey a second flow of water. A switching device (3) is provided immediately downstream the inlet conduits. A turbine (4) is provided downstream the switching device. The switching device is arranged to convey in an alternating order, the first flow and the second flow to the turbine in such a way that the first flow and the second flow alternately drives the turbine.