Hydraulic efficiency of a turbine is defined as:
1
\(\frac{{power\space at\space the\space shaft\space of\space the\space turbine}}{{the\space power\space delivered\space by\space water\space to\space the\space runner}}\)
2
\(\frac{{volume\space available\space at\space the\space shaft\space of\space the\space turbine}}{{Power\space supplied\space at\space the\space inlet\space of\space the\space turbine}}\)
3
\(\frac{{Power\space given\space by\space water\space to\space the\space runner\space of\space the\space turbine}}{{Power\space supplied\space by\space water\space at\space the\space inlet\space to\space the\space turbine}}\)
4
\(\frac{{volume\space of\space water\space actually\space striking\space the\space runner}}{{volume\space of\space water\space supplied\space to\space the\space turbine}}\)