Flow net

$2.$ The concrete dam shown below,

$($a$)$ Sketch a flow net.

$($b$)$ Using a flow net, compute the seepage rate $(q)$ per unit length in units of $\frac{m^3}{d}a\frac{y}{m}.$ The permeability of the soil is $k=5\mathrm{.}6{10}^{-3}c\frac{m}{s}.$

$($c$)$ Compute the pore water pressure $(u)$ at point $A,B$ and $C.$

$($d$)$ Compute the vertical effective stress $({}_v^{\text{'}})$ at point $x.$

Assume ${}_{\text{s}\text{a}\text{t}}=20k\frac{N}{m^3},{}_{vatx}40(m)$