Q$3.$ A flow net for flow around a single row of sheet piles in a permeable soil layer is

shown in Figure below with a scale as shown. Given that $kx=kz=k=4{10}^{-3}$

$c\frac{m}{sec},$ determine

a$.$ How high $($above the ground surface$)$ the water will rise if piezometers are

placed at points a and $b$

b$.$ The total rate of seepage through the permeable layer per unit length

c$.$ The approximate average hydraulic gradient at $c$

d$.$ factor of safety against piping