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rect 1392 2865 1439 3193 [[Liner|Impermeable Liner]]
rect 1392 2865 1439 3193 [[Liner|Impermeable Liner]]
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==Construction==
Where possible, bioretention areas should be kept offline until construction is complete, the drainage area stabilized, and vehicle mud tracking has stopped. Diverting flows around the facility offers several benefits, including: *less risk of erosion, clogging, and compaction;
*greater opportunity for establishment of seeded/planted areas; and
*easier access for construction, repairs or maintenance of the area.
Where diverting flows around the facility is not possible, and its location requires that it be used as a temporary runoff detention basin, protection measures can prevent fine sediment from migrating into the subgrade. During construction, the area should only be excavated to 75 cm above the final post-construction base of the facility. This layer of native soil will retain fine particles so that they will not migrate down into the subsoils. To prevent compaction during bioretention construction, heavy equipment should not enter the footprint of the bioretention area. For more detailed guidance, see the LID Construction Guide <ref> Credit Valley Conservation. 2012. LID Construction Guide. https://cvc.ca/wp-content/uploads/2012/01/CVC-LID-Construction-Guide-Book.pdf </ref> and the Erosion and Sediment Control Guide for Urban Construction <ref> Toronto and Region Conservation Authority. 2019. Erosion and Sediment Control Guide for Urban Construction. https://sustainabletechnologies.ca/app/uploads/2020/01/ESC-Guide-for-Urban-Construction_FINAL.pdf </ref>.
==Performance==
==Performance==