Problem:
A vertical pipe 0.35 m in diameter and 24 m long has a pressure head at the upper end of 6.4 m of water. When the flow of water through it is such that the mean velocity is 5 ms-1, the friction loss is hL = 2 m.
Required:
Question: Find the pressure head (in m) at the lower end of the pipe when the flow is upward.
Note: Please show how to work it out.