CSA W200-18 PDF Download

The CSA W200-18 standard is a guideline for the design of bioretention systems used for the management of urban stormwater runoff. The standard provides requirements and recommendations for the design of various types of bioretention systems, including those with underdrains and without underdrains, biofilters with impermeable liners, and bioretention planters and bump-outs.

The standard specifies that it does not have the force of law unless officially adopted by a regulatory authority. It is recommended to consult the relevant regulatory authority to determine the extent of the standard's adoption and to prioritize regulatory requirements in case of conflicts with the standard. The development of this standard was made possible through the support of the National Research Council Canada as part of its Climate Resilient Buildings and Codes Infrastructure initiative.

The scope of the standard includes bioretention systems for the management of urban stormwater runoff. However, it specifically excludes certain sub-types of bioretention systems such as bioswales, tree trenches or pits, and rain gardens. The standard also adheres to the requirements of the Standards Council of Canada for National Standards of Canada and has been published as a National Standard of Canada by CSA Group.