Water Lifting System and Method Having Such a System

A method for operating a water lifting system, the water lifting system including a pump having an inlet port and a discharge port, a pump-turbine assembly having a pump unit and a turbine unit, the pump unit and turbine unit in each case having an inlet port and a discharge port, a volume flow line arranged to conduct a volume flow between the pump unit discharge port and the pump inlet port, the volume flow including a first partial volume flow and a second partial volume flow, a first partial volume flow line conducting the first partial volume flow to at least one water extraction point, a second partial volume flow line conducting the second partial volume flow connected to the turbine unit inlet port, and a water reservoir, comprising the acts of:

• extracting the first partial volume flow from the water reservoir;
• delivering the first partial volume flow extracted from the water reservoir via the volume flow line to the at least one water extraction point via the first partial volume flow line;
• delivering the second partial volume flow extracted from the water reservoir via the volume flow line back to the water reservoir via the second partial volume flow line.