Two primary settling basins are $25m$ in diameter each with $2\mathrm{.}5m$ side water depth. Single effluent weirs are located on the peripheries of the tanks. For a water flow of $30,000m^3{d}^{-1}$ that is equally divided among the two tanks, calculate: $($i$)$ surface area and volume; $($ii$)$ overflow rate in $m^3{m}^{-2}{d}^{-1}$; $($iii$)$ detention time in hours; and $($iv$)$ weir loading in $m^3{m}^{-1}{d}^{-1}.$ Assume the settling basins to be circular with cone shaped bottom having a slope of $1$ vertical to $12$ horizontal.

$(3$ marks$)$