Every hydroelectric is a specific project and the waterfall size and volume usually determines the type of turbine (pelton, francis and kaplan are the most popu

Every hydroelectric is a specific project and the waterfall size and volume usually determines the type of turbine (pelton, francis and kaplan are the most popular from high to low) .. the denomination of pumped storage systems is applied when a reversible turbine is used, so no standard hydroelectric with a reservoir will be called pumped system, those are called impoundment. If you abuse nomenclature could be a open-loop pumped system. Discussion with example here: http://e360.yale.edu/features/for_storing_electricity_utilities_are_turning_to_pumped_hydro http://e360.yale.edu/features/for_storing_electricity_utilit... Economic comments here: http://large.stanford.edu/courses/2014/ph240/galvan-lopez2/ http://large.stanford.edu/courses/2014/ph240/galvan-lopez2/