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Flow (''Q'') in an open channel, such as a swale, may be calculated using Manning's equation:
{{float right|[[File:Swale_sections.PNG|frameless|450 px]]}}
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>
<math>Q=VA=\frac{R^{\frac{2}{3}}S^{\frac{1}{2}}}{n}</math>
Where:
Where:
*''P'' = the wetted perimeter of the swale (m)
*''P'' = the wetted perimeter of the swale (m)
*''S'' = the longitudinal slope (m/m)
*''S'' = the longitudinal slope (m/m)
*''n'' = Manning's coefficient (dimensionless)}}
*''n'' = [[Manning's coefficient]] or 'Manning's n' (dimensionless)}}
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{{:Manning's n}}