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Practices which infiltrate surface runoff through an engineered soil or [[filter media]], and discharge through an [[underdrain]] include [[stormwater planters]] and some forms of [[bioretention]].
Practices which infiltrate surface runoff through an engineered soil or [[filter media]], and discharge through an [[underdrain]] include [[stormwater planters]] and some forms of [[bioretention]].
The maximum flow rate from the BMP may be limited by the hydraulic conductivity of the medium, or by the properties of the perforated [[pipe]].
The maximum flow rate from the BMP may be limited by the hydraulic conductivity of the medium, or by the properties of the perforated [[pipe]]. See [[Flow through pipe]] page for guidance on estimating the maximum flow rate of a perforated pipe.
The maximum flow rate through a bed of filter media (''Q<sub>max, media</sub>'', m<sup>3</sup>/s) may be calculated as:
The maximum flow rate through a bed of filter media (''Q<sub>max, media</sub>'', m<sup>3</sup>/s) may be calculated as: