The most popular form of gradually varied flow equation is expressed as
Assume standard nomenclature of the terms used above.
1
\(\frac{{dy}}{{dx}} = \frac{{{S_0} - {S_f}}}{{1 - \alpha F{r^2}}}\)
2
\(\frac{{dy}}{{dx}} = \frac{{{S_f} - {S_0}}}{{1 - \alpha F{r^2}}}\)
3
\(\frac{{dx}}{{dy}} = \frac{{{S_0} - {S_f}}}{{1 + \alpha F{r^2}}}\)
4
\(\frac{{dx}}{{dy}} = \frac{{{S_0} - {S_f}}}{{1 - \alpha F{r^2}}}\)