QUESTION $2$

$(25$ marks$)$

A concrete wall, which is founded on impermeable Rock, is to be built as the side wall of a river channel as shown in the design cross$-$section in Figures $2($a$)$ and $2($b$).$ The Lump Safety Factor approach shall be adopted in design, and the relevant material and design parameters are as follows:

$\backslash$table$[[$Water$,$Density, ${}_w=10k\frac{N}{m^3}$