Q$.4($a$)$ The soil profile and properties were found as shown in Figure Q$\mathrm{.}4($a$).$

Unit Weight of Water $=9\mathrm{.}81k\frac{N}{m^3}$

Figure Q$\mathrm{.}4($a$)$: Soil Profile and Properties

Determine the following at Point B$,$ C and D below the ground surface.

$($i$)$ total vertical stress $({}_v)$;

$($ii$)$ pore water pressure $(u)$; and

$($iii$)$ effective vertical stress $({}^{\text{'}}{?}^v).$