In a proposed hydraulic power plant site, the available discharge in the river is

$70$ m$3$

$/$s under a net Head of $15$ m$.$ Assuming a turbine efficiency of $90\%$ and the

Speed as $100$ RPM$,$ compare the following two proposals, both same size in so

far as the number of turbines are concerned.

$($i$)$ Francis turbines with a Specific Speed of $150.$

$($ii$)$ Kaplan Turbines with a Specific Speed of $350.$