If HGL = 15 m and velocity head = 4 m, what is EGL?

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Multiple Choice

If HGL = 15 m and velocity head = 4 m, what is EGL?

Explanation:
The energy grade line represents total energy per unit weight, which includes elevation head, pressure head, and velocity head. The hydraulic grade line includes elevation head and pressure head but not velocity head. So EGL = HGL + velocity head. Here, HGL is 15 m and the velocity head is 4 m. Adding them gives 19 m for the EGL. That’s why the correct result is 19 m. If you tried to subtract the velocity head or ignore it, you’d get 11 m or 15 m, which don’t reflect the total energy including motion.

The energy grade line represents total energy per unit weight, which includes elevation head, pressure head, and velocity head. The hydraulic grade line includes elevation head and pressure head but not velocity head. So EGL = HGL + velocity head.

Here, HGL is 15 m and the velocity head is 4 m. Adding them gives 19 m for the EGL.

That’s why the correct result is 19 m. If you tried to subtract the velocity head or ignore it, you’d get 11 m or 15 m, which don’t reflect the total energy including motion.

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