Talk:Darcy-Weisbach equation

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I am trying to compare the head lost due to friction value by using the Darcy-Weisbach Equation and the Hazen-Williams Equation,however, I cant get an equivalent value, the 2 value difference a lot, 1 is 1.2 bar (Darcy-Weisbach Equation), the other is 0.5 bar! How could this happened? Which will be more correct? Or are there any rules that stated which equation is suitable for which situation?

[edit] Range of use

Can this equation be used for both laminar and turbulant flow, or is there a particular range of renoylds number that this equations works for. for instance, what happens in low velocity flow with high pressure, can the head loss still be calculated with this equation, or is there another method?

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