Explain how to solve For group $6$

she pile was installed as shown to reduce the flow of water into the construction site. The flow net is shown in the figure.

The coefficient of permeability for the clayey sand is $=1\mathrm{.}2{10}^{-7}\frac{m}{s},{}_{\text{s}\text{a}\text{r}}=19k\frac{N}{m^3}.$

The heights Y$1$ and Y$2$ are shown in the table below according to your group number.

Using the flow net shown in the figure, determine:

$($a$)$ The quantity of seepage in $\frac{m^3}{m}\frac{?}{?}$ year.

$($b$)$ The exit gradient and the factor of safety with respect to piping. Is it safe?

$($c$)$ The horizontal water pressure at points A and $B.$ What is the net horizontal force due water pressure? $($Assume the pressure at A and $B$ are the average pressures on the left and right sides of the sheet pile, respectively. Comment on your results.

$($d$)$ Water pressure and effective overburden stress at point C $(Y2m$ below the ground surface$).$

Note : The drawing is to scale.

inpervious ciag

$\backslash$table$[[,$Group$],[1,2,3,4,5,6,7,8,],[$h$1($m$),2\mathrm{.}5,3,3\mathrm{.}5,6\mathrm{.}5,4\mathrm{.}5,5,6,4,],[$h$2($m$),4,4,3\mathrm{.}5,4,3,3\mathrm{.}5,4,3,]]$