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Flood resilient design of new residential communities
This is the first edition of CSA W204, Flood resilient design of new residential communities. 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. CSA Group acknowledges that the development of this Standard was made possible, in part, by the financial support of Standards Council of Canada, as part of the Standards to Support Resilience in Infrastructure Program. This Standard was prepared by the Technical Committee on Flood Resilient Design in Communities under the jurisdiction of the Strategic Steering Committee on Natural Resources, and has been formally approved by the Technical Committee. This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.
Inclusions of the Standard 1.1.1 Purpose of this Standard The purpose of this Standard is to provide compliance criteria and guidance on the design of flood- resilient new residential communities as it relates to greenfield development only.
This Standard is applicable to the following building types
Note: Garages (attached and detached) and non-habitable accessory buildings (e.g., porches, gazebos) located on the residential lots are considered within the scope of this Standard
This Standard covers the following considerations
The types of flood hazards considered by this Standard include
Exclusions of the Standard 1.2.1 Other types of development This Standard does not cover flood resilience considerations as they relate to existing development, infill, intensification, or redevelopment.
Types of flood hazards Types of flood hazards that are outside the scope of this Standard include
This Standard includes requirements and recommendations expected to be relevant across Canada. Its application could be insufficient in the areas with permafrost, such as Yukon, Northwest Territories, and Nunavut, as well as in areas subject to coastal and lake flooding, where sea level rise and storm surges pose additional flood risk that is not addressed by the Standard.
This Standard provides requirements and recommendations for the design of flood-resilient greenfield community developments. In the application of this Standard, it should be noted that local jurisdictions might have criteria or requirements beyond what is provided in this Standard. The intent of this Standard is to provide minimum acceptable criteria. In the event that a local jurisdiction requirement is more stringent than that required by this Standard, the more stringent requirement takes precedence over the requirement stipulated in this Standard. It is the responsibility of the user of this Standard to be aware of any discrepancies and to determine the manner in which it can be resolved.
This Standard provides a dynamic approach to the design of flood-resilient new residential communities. This includes the use of data that anticipates future climate changes, including changes in the frequency of extreme rainfall events. Such data is currently the subject of intense research but is not yet available with adequate confidence. In the absence of such predictive climate data, the users of this Standard should consider applying appropriate adjustments to current intensity-duration-frequency (IDF) values to account for climate uncertainties. For information on the use and interpretation of IDF information, see CSA PLUS 4013:2019.
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.
| SDO | CSA: Canadian Standards Association |
| Document Number | |
| Publication Date | Jan. 1, 2019 |
| Language | en - English |
| Page Count | 70 |
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