Prior Experimental and theoretical background of the
Banki water turbine has been briefly presented.
Theoretical values of unit quantities have been compared
with published experimental data as well as data obtained
in the hydraulic lab at the University of Tehran; from
which, shortcomings of the existing theory in predicting
the turbine performance has been highlighted. Factors
responsible for the deviation of turbine performance from
the existing theory has been discussed; an algorithm for
developing the appropriate theory and several areas for
future experimental research has been proposed
)