Determine the paddle surface area in $m^2$ required to achieve a G value of $50s^{-1}$ in a flocculation tank with a volume of $3000m^3.$ Assume a water viscosity of $1\mathrm{.}139{10}^{-3}N-$s $\frac{?}{m^2},$ density of $999\mathrm{.}1k\frac{g}{m^3},$ a drag coefficient of $1\mathrm{.}8,$ a relative paddle velocity of $0\mathrm{.}45\frac{m}{s}.$