Q$.6$ Given the soil profile and properties shown in the figure where water flows from point B to point A$.$ If the head difference between $B$ and $C$ is $3m.$ Compute:

$($a$)$ The quantity of flow per unit area

$($b$)$ The total head at B$,$ A and C$.$

$($c$)$ The total overburden stress, water pressure and effective overburden stress at poin $C($Note A$,$ B and C are along the same vertical line$)$