# Difference between revisions of "Flow in a swale"

From LID SWM Planning and Design Guide

Jenny Hill (talk | contribs) (Created page with "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: <math>R=\frac{A...") |
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− | 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> | ||

Where: | Where: | ||

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*''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]] (dimensionless)}} |

## Latest revision as of 17:08, 11 January 2019

Flow (*Q*) in an open channel, such as a swale, may be calculated using Manning's equation\[Q=VA=\frac{R^{\frac{2}{3}}S^{\frac{1}{2}}}{n}\]
Where\[R=\frac{A}{P}\]

Where:

*Q*= the flow in the swaleA shallow constructed channel, often grass-lined, which is used as an alternative to curb and channel, or as a pretreatment to other measures. Swales are generally characterized by a broad top width to depth ratio and gentle grades. (m^{3}/s)*A*= the cross sectional area of the swaleA shallow constructed channel, often grass-lined, which is used as an alternative to curb and channel, or as a pretreatment to other measures. Swales are generally characterized by a broad top width to depth ratio and gentle grades. (m^{2})*P*= the wetted perimeter of the swaleA shallow constructed channel, often grass-lined, which is used as an alternative to curb and channel, or as a pretreatment to other measures. Swales are generally characterized by a broad top width to depth ratio and gentle grades. (m)*S*= the longitudinal slope (m/m)*n*= Manning's coefficient (dimensionless)