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The first term in the right side of 

LaTeX Math Block Reference
anchorgradP
defines the hydrostatic column of static fluid while the last term defines the friction losses under fluid movement:


In most many practical applications in 
water producing or water injecting wells, water can be considered as incompressible and friction factor  can be assumed constant

LaTeX Math Inline
body f(l) = f_s = \rm const
 along-hole ( see  Darcy friction factor in water producing/injecting wells ).

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