Summary:

Flood risk management and river training made with use of bed stabilization techniques followed by straitening and shortening of river corridors caused increase of the fall. As the effect hydrotechnical structures emerged with the aim of utilisation of water energy by damming the water movement. Such a structures break a river's continuity and fish migrations upwards the river is impossible. Regaining river's connectivity requires use of additional hydrotechnical solutions having purpose of making possible for fish to navigate obstacle in their migration up rivers and streams. Over the time development of the solutions in the field of fish migrations leaded to variety of constructions among them only some number really functional. The necessary compromise is needed to met all the expectations for any type of the fish pass, among them minimal and maximal water velocities, high energy losses, geometrical limitations especially considering the fact their interconnected.
The paper proposes separation of particular elements generating energy losses in water movement described by energy dissipation formulae. Measurements were taken on an existing rock ramp fish way on the Tuszymka River in the Kamionka settlement and consisted of fish way geometry and water velocities. Water velocities measurements location concentrated along the places with maximal velocities for position of the line representing maximal values to be estimated. Measurement's methodology beside the main aim focused on limiting in site acquired number of necessary data. Presented results concentrate mostly around the problem of energy losses dimension and it's spatial allocation in the rock ramp fish way.