$11-10.$ The rapid sand filter being designed for Eau Gaullie has the characteristics and sieve analysis shown below. Using

the Rose equation, determine the headloss for the clean filter bed in a stratified condition.

Depth $=0\mathrm{.}60m$

Filtration rate $=120\frac{m^3}{d}*m^2$

Sand specific gravity $=2\mathrm{.}50$

Shape factor $=0\mathrm{.}80$

Stratified bed porosity $=0\mathrm{.}42$

Water temperature $=19C$

Sand analysis