Problem $4$ For the soils and water profiles provided in Figure $1,$ calculate the variation of elevation head,

fluid pressure head, and total head with elevation. In addition, use the Darcy's law to calculate the water

flow velocity in the tube and the seepage velocity in the soil layers. Atmospheric pressure is maintained at

the top of the reservoir water $($elevation $z=12ft)$ and at the bottom of the tail water $($elevation $z=0ft).$

Figure $1.$ This figure for problem $4$ shows flow through two soils in series.