Situation $4.$ The soil layer under a dam is made up of $4$ layers with the following properties:

What is then equivalent coefficient of permeability in the vertical direction?

a$.1\mathrm{.}25\frac{m}{?}$ day

b$.0\mathrm{.}95\frac{m}{d}ay$

c$.0\mathrm{.}65\frac{m}{?}$ day

d$.0\mathrm{.}75\frac{m}{?}$ day

What is the transmissivity of the soil when the water table is at the ground surface?

a$.25\mathrm{.}42\frac{m^2}{?}$ day

b$.18\mathrm{.}75\frac{m^2}{?}$ day

c$.15\mathrm{.}24\frac{m^2}{?}$ day

d$.20\mathrm{.}87\frac{m^2}{?}$ day

If the hydraulic gradient of flow is $0\mathrm{.}002,$ what is the interstitial velocity of water through the soil, if the

soil has an average void ratio of $0\mathrm{.}70?$

a$.,0\mathrm{.}0152c\frac{m}{h}r$

b$.0\mathrm{.}0187c\frac{m}{h}r$

c$.0\mathrm{.}0214c\frac{m}{h}r$

d$.0\mathrm{.}0321c\frac{m}{h}r$