Question $4$:

$($Value: $20$ marks$)$

A footing as shown in Figure $2($shaded area only$)$ is loaded to a uniform intensity of $100$ kPa.

$($i$)$ Determine the increase in vertical stress that occurs at a depth of $2\mathrm{.}0m$ below point A using Newmark's chart. Also, determine the increase in vertical stress using any another suitable method. Comment on the results that you have obtained using these two methods.

$($ii$)$ Will the vertical stress increase or decrease at $4\mathrm{.}0$ and $6\mathrm{.}00$ depth for the same loading? Provide your answer as a discussion without any calculations.