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*''S'' = the longitudinal slope (m/m)
*''S'' = the longitudinal slope (m/m)
*''n'' = Manning's coefficient (dimensionless)
*''n'' = Manning's coefficient (dimensionless)
*''b'' = bottom width of trapezoidal swale, in m.}}
*''b'' = bottom width of trapezoidal swale, in m.
* ''q'' = flow per unit width (m<sup>2</sup>/s)}}