$7.[$O$2](20$ points$)$ For the problem illustrated in Figure$4,$ draw the flow net and calculate the flow that each drain

will collect per unit of length. The pipe flow is only due to gravity $($i$.$e$.,$ the pressure head is $0$ in the pipe$).$For the problem illustrated in Figure $4,$ draw the flow net and calculate the flow that

each drain will collect per unit of length. The pipe flow is only due to gravity $($i$.$e$.,$ the

pressure head is $0$ in the pipe$)$