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...s Incorporated. 2008a. 20 Year Performance Evaluation of Grassed Swale and Perforated Pipe Drainage Systems. Project No. 524(02). Prepared for the Infrastructure |Grass swale/perforated pipe||Nepean, ON<ref name=Sabourin/>||Sandy silty till||86 %

.... Runoff water is delivered to the practice through [[pipes]] connected to catchbasins, hydrodynamic (i.e., [[ Oil and grit separators|oil and grit]]) separators, ...ceive stormwater from them. May include manholes with [[Flow through riser|perforated risers]]. Also known as exfiltration storm sewer, percolation drainage, or

*[[Bioswales]] or the use of [[perforated pipes]] beneath grass swales can reduce the nuisance problems associated wi ...enance. However, adequate pretreatment such as grass swales, extended sump catchbasins, or prefabricated units must be provided.

|Sub-drain/Perforated pipe obstruction ...Excavation and Grading''' - prior to backfilling and installation of pipes/catchbasins

...groundwater, or collected by a [[Underdrain|sub-drain]] (i.e., underground perforated pipe) and discharged to the storm sewer system or another BMP. Depending on |Sub-drain/Perforated pipe obstruction

...ver present, to the highest elevation of accumulated sediment present. For catchbasins, manholes and hydrodynamic separator pretreatment devices a sludge sampler ...filtration trenches]], [[infiltration chambers]] and [[Exfiltration trench|perforated pipe storm sewer systems]]'''

...de soil. When runoff volume exceeds the trench water storage capacity, the perforated underdrain pipe directs excess filtered water to a downstream outlet storm ...l cell systems vs. structural soil medium) and elevation of the underdrain perforated pipe in the cross-section based on subgrade soil permeability.

...curb openings (e.g. modified curbs, spillways), pipes, road or side inlet catchbasins, trench drains or other pre-fabricated inlet structures; ...with 'tighter' soils where infiltration rates are < 15 mm/hr. Including a perforated [[pipe]] in the [[reservoir aggregate]] layer helps to empty the facility b