Question $1(40$ marks$)($CO$1,$ PO$1,$ C$4)$

The client has provided two cross$-$sections based on their preferences.

Figure $1($a$)$ shows the usage of the Sheet Pile while Figure I$($b$)$ shows usag

e of Sheet Pile and Soil Embankment. Using your fundamental knowledge

on seepage analysis, develop flow net diagram for both options. Then,

tabulate the Elevation head, Dissipated head, Total head and Pressure

head at points of intersection of flow line and equipotential line for both

options, separately. Next, calculate the exit gradient for both options. Use

k$=4\mathrm{.}2$ xx$10-2$cm$//$s for sandy soil.

Figure $1($a$)$

Figure $1($b$)$

You are a civil engineer at a reputable geotechnical engineering

consultancy, and you've been assigned a project focused on sustainable

flood mitigation. The client has two preferences on the structure to be

constructed but could not determine the best option. The success of this

project is crucial as it aims to provide a sustainable flood control for the

local community. Therefore, the client requires you to carry out seepage

analysis to select the best structure to be used.$$

give the answer based on this need.

$-$Student is able to apply geotechnical fundamental knowledge and correctly carry out

seepage analysis.$$

$-$Student abled to accurately distinguish the conflicting technical issue.