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Flow (''Q'') in an open channel, such as a [[swale]], may be calculated using Manning's equation:

<math>Q=VA=\frac{R^{\frac{2}{3}}S^{\frac{1}{2}}}{n}</math>

Where:

*''P'' = the wetted perimeter of the swale (m)

*''S'' = the longitudinal slope (m/m)

*''n'' = [[Manning's coefficient ]] (dimensionless)}}