vanes 3 is similar to the setting in a conventional kaplan bulb turbine in order to achieve optimum efficiency the setting angle u03b2 of the impeller blades 2 varies between 0 u00b0 and 40 u00b0 similarly the setting angle u03b1 of the guide vanes 3 is set between 0 u00b0 and less than 90 u00b0 the setting angles u03b2 and u03b1 are with respect to an axis of the turbine and a line between a leading and trailing edge of the blade or impeller further the setting angel may be with respect to a radially inward portion of the blade or impeller such as proximate to the hub of the turbine in pump operations the water flows in the direction of the arrow 5 from the tailwater 11 over the impeller with impeller blades 2 through the guide wheel with guide vanes 3 into the headwater 10 here too the setting angle u03b2 of the impeller blades 2 varies between approximately 0 u00b0 and 40 u00b0 in the same way the angle u03b1 of the guide vanes 3 is set between 0 u00b0 and less than 90 u00b0 now a concept with a reservoir has been developed for a tidal power station at high tide the water from the sea corresponding to the head water 10 flows through the turbine 1 into the reservoir corresponding to the tailwater 11 at low tide reverse operation as shown in fig2 is applied here the water flows in the direction of the arrow 6 out of the reservoir corresponding to the headwater 12 through the turbine 1 impeller with impeller blades 2 and guide wheel with guide vanes 3 back into the sea corresponding to the tailwater 13 for this purpose the angle u03b2 of the impeller blades.