$**$ I have seen multiple solutions for this problem here on chegg but none of them makes sense, can you please solve this gravity pipeline problem step by step by explaining each part? I will up vote$**$

Aim

is to transmit water from the source to the end point.

Option

is to use gravity pipeline system $($may use tools i$.$e$.$ pump, air valve, pressure reducer, etc if required!$).$

Problem

The following system transmits water from Reservoir A to Reservoir B by means of a gravity pipeline where, $L=3500m,f=0\mathrm{.}017$ and $D=0\mathrm{.}7m$ for all pipes. This pipe line has two high points at $C$ and $E,$ where small$-$orifice air valves are installed. Assume that the valves require $5m$ of line pressure head for proper operation.

Checking the design specifications at required locations,

a$)$ determine the maximum discharge that the system can supply, and

b$)$ determine the head loss at the exit valve such that no open channel flow is to be developed.$(5mat$ required locations,

$a)$ determine the maximum discharge that the system can supply, and

$b$