$($Das P$8\mathrm{.}4$ and P$8\mathrm{.}5)$ Consider the hydraulic structure shown in Figure $5.$ You may assume that the

hydraulic structure is impermeable. Also, the groundwater level on the right of the hydraulic

structure is at the ground surface.

$($i$)$ Draw a flow net for the flow through the permeable layer.

$($ii$)$ Determine the pressure heads and water pressures at D$,$ E$,$ F$,$ G$,$ H$,$ I.

$($iii$)$ If the hydraulic conductivity of the permeable layer is $k=0\mathrm{.}002c\frac{m}{s},$ calculate the total $-$

flow rate in $\frac{m^3}{d}a\frac{y}{m}($i$.$e$.,$ assume unit length perpendicular to the cross section$).$

Points D$,$ E$,$ F$,$ G$,$ H$,$ I under the hydraulic structure

Figure $5.$ Hydraulic structure for Question $9$