A sedimentation tank is being used for the settling of solid dirt particles in the downstream processing step of effluent from a distillery, after the fermentation of molasses. The feed has a solid content of $1\%$ and the outlet stream $($top layer$)$ is free of solids. The feed rate is $1Li\frac{t}{sec},$ the average diameter of the solid particle is $50$ microns and its specific gravity is $2\mathrm{.}65.$ The density and viscosity of fluid are close to water. Estimate the necessary diameter of the tank. $($Answer: $D=0\mathrm{.}7525m)$