$7\mathrm{.}5$ A rectangular sedimentation tank is designed with a depth of $3\mathrm{.}5$ m

and a detention time of $1$ h$.$ Is the design sufficient to achieve complete removal of particles with a diameter of $0\mathrm{.}01$ mm$?$ Specific gravity of the particles is $2\mathrm{.}65.$ The flow rate and temperature of water

are $10,000$ m

$3$

$/$d and $20$C$,$ respectively. At $20$C$,$ density of water is

$998$ kg$/$m

$3$

and dynamic viscosity of water is $10$

$3$

kg$/$m $$ s$.$ State any

assumptions you make to calculate your results.