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The Colebrook equation is generic and can be used to calculate friction coefficients for different kinds of fluid flows - like air ventilation ducts, pipes and tubes with water or oil, compressed air and much more. Colebrook Online Calculator. The friction coefficient can be calculated with the online Colebrook calculator below. Colebrook–White equation. The phenomenological Colebrook–White equation (or Colebrook equation) expresses the Darcy friction factor f as a function of Reynolds number Re and pipe relative roughness ε / D h, fitting the data of experimental studies of turbulent flow in smooth and rough pipes. Footnotes refer to Manning n table above. All other Manning n values (roughness coefficients) were obtained from the references listed in our Discussion and References page. a Barfuss, Steven and J. Paul Tullis. Friction factor test on high density polyethylene pipe. Hydraulics Report No. 208. Utah Water Research Laboratory, Utah State University. Roughness Coefficients. The roughness coefficients incorporated in FLUFF as default values are the smoothest values given in Australian Standard 2200 and are for clean concentrically jointed pipes. The coefficient may need to be varied depending on biological or slime growths, mineral deposits, corrosion, erosion or air entrapment.