Following data is given for the Rapid Sand Filtration Unit:

a$.$ Filtered Water Requirement $=4$ MLD

b$.$ Water used for back wauhing of filter $=3\%,$ time lost in washing every day $=30$ minutes, average filtration rate $=4000\frac{V}{h}\frac{r}{m^2},$ length of filter is twice of width

c$.$ Perforation area of under$-$drainage $=0\mathrm{.}3\%$ of total area of filter

d$.$ Diameter of perforation $=12mm$

c$.$ Area of laterals $=2$ times the area of perforation

f$.$ Area of manifold $=$ Twice the total area of laterals

e$.$ Spacing of laterals $=15cm$

Find out the foltowing:

A$.$ Length and width of filter

B$.$ Diameter of manifold

C$.$ No$,$ of laterals

D$.$ Length of each lateral

E$.$ Draw the sketch of RSF showing laterals and manifold. $)=(12$