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The Darcy-Weisback 'f' is related to Manning's 'n' as
1
\({\rm{f}}\,{\rm{ = }}\frac{{8{\rm{g}}{{\rm{n}}^2}}}{{{{\rm{R}}^{1/3}}}}\)
2
\({\rm{f}}\,{\rm{ = }}\frac{{{\rm{g}}{{\rm{n}}^2}}}{{{\rm{8}}{{\rm{R}}^{1/3}}}}\)
3
\({\rm{f}}\,{\rm{ = }}\,\frac{{{{\rm{R}}^{1/3}}}}{{8{\rm{g}}{{\rm{n}}^2}}}\)
4
\({\rm{f}}\,{\rm{ = }}\,\frac{{64{\rm{ng}}}}{{{{\rm{R}}^{1/3}}}}\)