Difference between revisions of "Flow in a swale"
From LID SWM Planning and Design Guide
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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> | ||
Revision as of 17:25, 3 July 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. (m3/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. (m2)
- 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)
