Installing an auxiliary turbine driving an induction generator which discharges into a head
tank 5 - 10 m above the generator is a simple and reliable solution. The turbine output
is controlled by the level in the head tank. This recovers the energy, settles out silt and
reduces the pressure. In a multi machine station, it is wise to provide a backup supply
via a pressure reducing valve so that the auxiliary generator can be shut down for
maintenance. This configuration is illustrated in figure 3