Problem $4$:

The hydraulic grade line $($HGL$)$ and the energy grade line $($EGL$)$ are chw a certain flow system.

Figure r$.$s: Diagram for the HGL and EGL of an unknown flow system.

$($a$)[1$ point$]$ is the flow from $A$ to $E$ or from $E$ to $A?$

$($b$)[1$ point$]$ Does it appear that a reservoir exists in the system? If so$,$ where?

$($c$)[1$ point$]$ Does the pipe at $E$ have a uniform or a variable diameter?

$($d$)[1$ point$]$ Is there a pump in the system?

$($e$)[1$ point$]$ Sketch the physical setup that could yield the conditions shown between $C$ and $D.$