Typical efficiency curves of various types of turbines are
shown for comparison in Figure 4. These curves are shown
to illustrate the variation in efficiency of turbines operated
at heads above and below design head are discussed.
Approximate efficiencies at rated capacity for the reaction
turbine are shown with a throat diameter of one foot. Rated
efficiency will increase as the size of turbine increases .The
efficiency curves shown are typical expected efficiencies.
Actual efficiencies may vary with manufacturer and design.