There will be no change because EGL is the same height as the HGL.
The energy grade line is the sum of the hydraulic grade line and the velocity head (V²/2g).
EGL = HGL + V²/2g
In a reservoir, the Energy Grade Line (EGL) is equal to the Hydraulic Grade Line (HGL) since the fluid is at rest (V = 0).
EGL = HGL
EGL is the height to which a liquid will rise. This cannot rise above the reservoir level unless additional work is introduced into the reservoir by the means of a pump.
Therefore, there will be no change because EGL is the same height as the HGL.
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