Flow through perforated pipe

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

$Q_{max,p}=B\times C_{d}\times A_{o}{\sqrt {2\cdot g\cdot \sum d+}}$

Where:

• K_m is the hydraulic conductivity of the filter media (mm/hr),
• A_p is the area of the practice (m²),
• d_p is the depth of ponding (mm),
• d_m 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),

A parameter that describes the capability of a medium to transmit water.

The engineered soil component of bioretention cell or dry swale designs, typically with a high rate of infiltration and designed to retain contaminants through filtration and adsorption to particles.

A shallow excavated surface depression containing prepared filter media, mulch, and planted with selected vegetation.