Estimate the head loss through a coarse screen before

and after the accumulation of solids occurs. Assume

the following conditions for solving the problem. The

approach velocity and velocity through the screen are

$0\mathrm{.}5$ meters per second and $0\mathrm{.}9$ meters per second, respectively. The open area through the clean bar screen is $0\mathrm{.}20$ m$2.$

a$.$ Estimate the head loss $($m$)$ through the clean bar

screen assuming a discharge coefficient of $0\mathrm{.}7$ for a

clean screen.

b$.$ Estimate the head loss $($m$)$ through the clogged bar

screen assuming a discharge coefficient of $0\mathrm{.}6$ for a

clogged screen and that $50\%$ of the flow area has

been blocked by debris.