Flow through perforated pipe

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Manufacturers of perforated pipe are often able to provide the open area (m2) per meter length.

Where:

  • Km is the hydraulic conductivity of the filter media (mm/hr),
  • Ap is the area of the practice (m2),
  • dp is the depth of ponding (mm),
  • dm is the depth of the filter media (mm), and
  • Σ d is the total depth of bioretention components over the perforated pipe (mm) (e.g. ponding/mulch/filter media/choker layer),