Ouestion $4$:

A square footing $(B=L=2m)$ was located at a depth of $1\mathrm{.}3m$ below the ground surface in a sand deposit $(c^{\text{'}}=0\mathrm{.}5$kPa,${}^{\text{'}}=32)$ as shown in Fig. $4.$ Determine the gross allowable load, $Q_{\text{a}\text{l}\text{l}}$ for the following two cases using Meyerhof's general bearing capacity equation $(1963)$:

$q_u=c^{\text{'}}{N}_c{F}_{cs}{F}_{cd}{F}_{ci}+q{N}_q{F}_{qs}{F}_{qd}{F}_{qi}+\frac{1}{2}B{N}_{}{F}_s{F}_d{F}_i$

$($i$)$ Assume a factor of safety value equal to $3.$ The ground water table $($GWT$)$ is located at a depth of:

Case $($a$)$: GWT $=0\mathrm{.}8m$

Case $($b$)$: GWT $=1\mathrm{.}8m$

$($ii$)$ Would the ultimate bearing capacity increase or decrease when the ground water table rises to the ground surface? Provide your reasons without any calculations.