Complete the following:

$($a$).$ Draw the system consisting of the two reservoirs and pipeline in your exam booklet. Then, draw the total energy line and the hydraulic grade line in your diagram. Show all head losses in this diagram.

$($b$).$ Using the Moody diagram, determine the flow in the pipeline. Include all head losses in all your calculations. Express your answer in litres per second.

$($c$).$ This question is a general question about flow in pipes. What is the physical significance of a hydraulic grade line being located below the centreline of the pipe?

Maximum marks: $20$