W201-18

Preface This is the first edition of CSA W201, Construction of bioretention systems. It should be noted that this Standard, by itself, does not have the force of law unless it is officially adopted by a regulatory authority. Since regulatory authorities can adopt the Standard with certain exceptions or additional requirements, the regulatory authority of the relevant jurisdiction should be consulted in order to establish the extent to which this Standard has been adopted. Where this Standard conflicts with regulatory requirements, the regulatory requirements take precedence. The following publications were consulted during the development of this Standard: City of Calgary Stormwater Source Control Practices Handbook (2007) and Bioretention and Bioswales (2016). This project was made possible through the generous support of the National Research Council of Canada as part of its Climate Resilient Buildings and Codes Infrastructure initiative. This Standard has been developed in compliance with StandardDetails Council of Canada requirements for National StandardDetails of Canada. It has been published as a National Standard of Canada by CSA Group. Scope 1.1 This Standard covers the construction considerations for bioretention systems. 1.2 This Standard covers the following items: a) roles and responsibilities; b) contract documentation; c) construction sequencing; d) erosion and sediment control for bioretention systems; e) construction documentation; f) material supply and handling; g) installation considerations; h) landscape materials and maintenance; i) construction warranty maintenance; and j) assumption protocols. 1.3 In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.