Civil Engineering MCQAE Level Civil Engineering
The hydraulic grade line (HGL) in pipe flow lies below the energy grade line (EGL) by a distance equal to:
Fluid MechanicsHydraulic GradientMEDIUM
Choose the correct answer
A
The head loss due to friction
B
The pressure head at that section
C
The velocity head V2/2g
D
The elevation head z
Correct Answer
C. The velocity head V2/2g
Why is this the answer?
EGL = HGL + V2/2g. The HGL is at the piezometric head (p/gamma + z), and EGL includes the velocity head. So EGL - HGL = V2/2g at any section.
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