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[[Swale_sections.PNG|frame]]

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>