Conside

$0\mathrm{.}01c\frac{m}{sec}$ und $u_{2}fl$ flow of water through two layers of soil of different permeability $k_1=$ Assume the cross section ${}_{1,\text{s}\text{a}\text{t}}={}_{2,\text{s}\text{a}\text{t}}=25k\frac{N}{m^3}$ figure below. The unit weight of water $10k\frac{N}{m^3}.$

a$)$ Determine the equilion area of soils equal to $2m^2.$

b$)$ Determine the equivalent permeability $($in vertical direction$)$ of the layered soil. $(8pts.$

pore water pressures and effective stresses at points A and $B.(17$ pts$.)$