The marine biologists have correlated fish survival rates with operating efficiency of Kaplan hydroelectric turbines as shown in Fig 1.

This is generic data that shows the profile to anticipate, but for optimum return on investment from a hydroelectric facility the individual turbines must all be index tested and optimized individually and then each must have their own unique 3-D Cam surface profile re-defined on a maximum 5-year interval by index testing and optimization.

The rule for fish mortality mitigation is that during the times designated by NOAA Fisheries, this turbine may only be operated inside the vertical Power Span Bounded by 1% Efficiency Envelope.