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can anyone explain the solution to this problem? I understand the concept, but don't understand the math they are using. The total head loss in the problem is the difference between the two free water surfaces - which is 12 + 15 = 27 on the left side and 12 on the downstream side, so the total...

The solution for the afternoon water sample problem #501 does not make sense to me. HGL is defined as the pressure head plus the elevation head, so why does the change in HGL - pipe friction = pressure at that point? if you assume the elevation is constant for the whole run, then the change in...