A first$-$stage flocculation tank is $5$ m long, $4$ m wide and $5$ m deep. The impeller is a six$-$bladed Rusthon turbine $($ Np $=5)2$ m in diameter rotating at $10$ rev$/$min$.$ The water density is $999\mathrm{.}7$ kg$/$m$3$ and the viscosity is $1\mathrm{.}31$ x $10-3$ kg$/$m$-$s$.$ What is the Reynolds number? How much power $($W$)$ does the impeller transmit to the water? Determine the power input per unit volume, in kW$/1000$ m$3.$ Determine the velocity gradient G $($s$-1)$ in the flocculator?