Q$4[25$ points$]$ You are an environmental engineer in a water treatment plant. The plant is using to much energy in the rapid sand filters. Because the head loss of the rapid sand filters are high $($Example $11-1,$ page $1137,$ Metcalf & Eddy$).$ Can you try to reduce the head loss to its half value $($at least$)$ in clean filter media.

a$.$ Make the changes $($what are they$-$ SHOW ME THE DATA ON THE PAPER$),$

b$.$ Make the calculations and

c$.$ Compare the reduction that you achieve with the original value.