$11-12.$ The rapid sand filter being designed for Laramie has the characteristics shown below. Using the Rose equation, determine the headloss for the clean filter bed in a stratified condition. Depth $=0\mathrm{.}75$m Filtration rate $=230($m$^(3))/($d$)*$m$^(2)$ Sand specific gravity $=2\mathrm{.}80$ Shape factor $=0\mathrm{.}80$ Stratified bed porosity $=0\mathrm{.}50$ Water temperature $=5$deg C Sand analysis