A$.$ In Reference to Figure $5,$ given:

$H1=6m$

$D=3m$

$H2=1\mathrm{.}5m$

D$1=6$ m

i$.$ Draw a flow net, using four channels.

$(10$ marks$)$

ii$.$ Calculate the seepage loss per meter length of the sheet pile $($at right angles to the cross section shown$)$ flow net for flow around a single row of sheet piles in a permeable soil layer. Given that $kx=kz=k=610-3c\frac{m}{sec},$ determine: The total rate of seepage through the permeable layer per unit length.

$(5$ marks$)$

Figure $5$: Single$-$Row Sheet Piles Driven into Permeable Soil Layer