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The absolute value is staying between 

LaTeX Math Inline
bodyf = 0.04
 for the very small flow rates (< 100 cmd in 3" pipe) and 
LaTeX Math Inline
bodyf = 0.015
 for the very high flow rates  (> 1,000 cmd in 3" pipe) and this should be taken into account in calculations. 

For complex well designs with varying pipe flow diameters and water source/stocks which may lead to substantial variation of flowrate the wellbore model can be split in segments each having a constant friction factor.

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