Significant impact on navigation operation by hydropower plant (HPP) operation is mostly in diversion channels of hydropower plants, when these channels are used for navigation as well. It is caused by sudden changes in flow rate of hydropower plants, which is connected to providing of support serveces for electric power system. The objective of the esearch is t determine limits of acceptable hydropower plant operation or propose pecautions which enable harmonizaton of opposing interests of navigation and power generation. and Obsahuje seznam literatury