$7-2$ A filter is designed with the following specifications. The anthracite and sand have densities of $1700$ and $2650k\frac{g}{m^3},$ respectively, and the design temperature is $10C.$ For a given sample $($to be selected by instructor$),$ calculate the clean$-$bed head loss.

$\backslash$table$[[$Item$,$A$,$B$,$C$,$D$,$E$],[$Bed type,Monomedia,Monomedia,$\backslash$table$[[$Dual$],[$media$]],\backslash$table$[[$Dual$],[$media$]],\backslash$table$[[$Dual$],[$media$]]],[$Filtration rate $(\frac{m}{h}),8,15,15,10,10],[$Anthracite specifications:$],[$Effective size $($mm$),,1\mathrm{.}0,1\mathrm{.}0,1\mathrm{.}2,1\mathrm{.}6],[$Depth $(m),,1\mathrm{.}8,1\mathrm{.}5,1\mathrm{.}4,1\mathrm{.}2],[$Sand specifications:$],[$Effective size $($mm$),0\mathrm{.}55,,0\mathrm{.}5,0\mathrm{.}55,0\mathrm{.}55],[$Depth $(m),0\mathrm{.}75,,0\mathrm{.}3,0\mathrm{.}4,0\mathrm{.}7]]$