CSA W204:2019 pdf download.Flood resilient design of new residential communities
1.2.3 Geographic limitations
CSA W204 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.
1.3 Requirements of local jurisdictions
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.
1.4 Climate uncertainty considerations
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.
1.5 Terminology
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.CSA W204 pdf download.