Problem $1$

A mechanically cleaned bar screen is used in preliminary treatment for the following conditions:

Wastewater flow rate $=100,000\frac{m^3}{d}$

Approach velocity $=0\mathrm{.}6\frac{m}{s}$

Open area for flow through the screen $=1\mathrm{.}6m^2$

Head loss coefficient for clean screen $=0\mathrm{.}75$

Head loss coefficient for clogged screen $=0\mathrm{.}60$

Incline from vertical $=0$

a$.$ Calculate the clean water head loss through the bar screen.

b$.$ Calculate the head loss after $40\%$ of the flow area is clogged with solids.