Question $2(25$ points$).$

A plain concrete wall rests on a secure foundation and serves as a small dam on a creek $($see figure$).$ The height of the wall is $h=2m$ and the thickness of the wall is $t=0\mathrm{.}3m.$ Determine the maximum tensile stress $)$ and maximum compressive stress $(s_c)$ at the base of the wall when the water level reaches the top $)=(h.$ Assume plain concrete has weight density of $g_c=23k\frac{N}{m^3}.$