Accept that you are ready to buy. From this opportunity an entrepreneur who wants to take advantage of the lake surface 75 m. to build a large water tank above it and cheap at night. into the chamber with the pump-motor group using electrical power. flooding and by releasing the water from the reservoir into the lake during the day pump-motor group as turbine-generator group. plans to operate and generate electrical power. pre-made irreversible load on the piping system 5.5