Flow in a swale

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Flow (Q) in an open channel, such as a swale, may be calculated using Manning's equation: Where:

Where:

  • Q = the flow in the swale (m3/s)
  • A = the cross sectional area of the swale (m2)
  • P = the wetted perimeter of the swale (m)
  • S = the longitudinal slope (m/m)
  • n = Manning's coefficient (dimensionless)