User:Latexman
On 10/2/2013, I corrected the Haaland equation in "Darcy Friction Factor Formulae" to yield the Darcy friction factor as follows:
![{\displaystyle {\frac {1}{\sqrt {f}}}=-1.8\log _{10}\left[\left({\frac {\varepsilon /D}{3.7}}\right)^{1.11}+{\frac {6.9}{\mathrm {Re} }}\right]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/1ff0097887695ba67a5d0255e0c00e2235134530)
Originally, the 1.8 constant was listed as 3.6 which was yielding the Fanning friction factor. Darcy friction factor = 4 X Fanning friction factor.