Changes

In practices such as [[bioretention]], [[swales]] or [[stormwater planters]], the flow limiting component is usually the [[filter media]]. See [[Flow through media]] page for guidance in this regard.  In underground practices such as [[infiltration trenches]], [[infiltration chambers]], and [[exfiltration trenches]], the perforated [[pipe]] that delivers water to the practice will be the primary flow limiting component.  

In practices such as [[bioretention]], [[bioswales]] or [[stormwater planters]], the flow limiting component is usually the [[filter media]]. See [[Flow through media]] page for guidance in estimating the maximum flow rate through bioretention filter media.  In underground practices such as [[infiltration trenches]], [[infiltration chambers]], and [[exfiltration trenches]], the perforated [[pipe]] that delivers water to the practice will be the primary flow limiting component.  

Manufacturers of perforated pipe are often able to provide the open area per meter length. Where this information is not directly available, the open area can be calculated by measuring the perforations and summing the open area per meter. The maximum flow rate through a perforated pipe (''Q_{max, pipe}'', m³/s) is calculated similarly to [[flow through an orifice]]:  

Manufacturers of perforated pipe are often able to provide the open area per meter length. Where this information is not directly available, the open area can be calculated by measuring the perforations and summing the open area per meter. The maximum flow rate through a perforated pipe (''Q_{max, pipe}'', m³/s) is calculated similarly to [[flow through an orifice]]: