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[[File:Swale_sections.PNG|border|200 px]]
[[File:Swale_sections.PNG|frameless|300 px]]
Flow (''Q'') in an open channel, such as a [[swale]], may be calculated using Manning's equation:
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>