A flow net for flow around a single row of sheet piles, which is $328$ ft long, in a permeable soil layer is shown in Figure $1.$ Given that $k_x=k_z=k=6\mathrm{.}2{10}^{-4}c\frac{m}{s},$ determine

a$)$ Mark the number of flow channels, number of potential head drops, and each head drop

b$)$ How high $($above the ground surface$)$ the water will rise if piezometers are placed at points a and $b$

c$)$ The approximate average hydraulic gradient at c

d$)$ Determine the quantity of seepage across the entire row of sheet piles.

Figure $1.$ Flownet for seepage around a single row of sheet pile