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Prioritization of flood risk in existing communities
This is the first edition of CSA W210, Prioritization of flood risk in existing communities . The purpose of this Standard is to provide voluntary guidance on a flood hazard and vulnerability screening framework. The purpose of the screening is to support the process of prioritizing flood risk areas within an existing (previously developed) community comprised of residential and mixed uses. This Standard provides a transparent, evidence-based, and defensible framework that supports resource allocation decisions regarding flood risk-reduction at the community level. Users of this Standard are reminded that additional and site-specific requirements could be specified by federal, provincial/territorial, municipal, or other authorities, or by a project owner. This Standard should not be considered a replacement for the requirements contained in any
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
This Standard outlines voluntary guidance associated with a flood hazard and vulnerability screening framework. The purpose of the screening framework is to aid in the process of prioritizing flood risk-reduction work within existing communities. This Standard provides
This Standard for existing communities (as opposed to new or recently planned communities) is guided by a number of principles and criteria which are intended to support the development and application of this Standard in various jurisdictions across Canada. This Standard is intended to support unbiased and transparent decision-making related to those locations within a municipality which are deemed to be most vulnerable to flooding. Once identified, these areas would be the priority for more advanced flood risk analysis, development and design of solutions, and/or flood mitigation investment. The principles include
This Standard is not intended to replace local, provincial, federal, or territorial directives related to infrastructure planning and design. It is to be viewed as a complement to existing CSA standards and those guidance initiatives. Common requirements in some jurisdictions are referred to in Annex D. Note: While increases in runoff due to climate change have received more attention, the impacts of uncontrolled intensification might actually be more severe if left unchecked. For instance, climate science suggests that rainfall intensities could increase by 30% to 40% by 2100 in some areas, while in some others decreases in local intensities are projected. In comparison, doubling the imperviousness from 30% to 60% might increase the runoff by more than 100%. This highlights the need for appropriate stormwater controls as part of integrated land use policies in communities subject to not only climate change, but intensification as well
The following summarizes those topics within and outside of the scope of this Standard. Geography
This Standard is intended for use primarily by municipalities and other authorities having jurisdiction across the different regions of Canada. Municipalities are typically the owners and operators of (public) storm infrastructure and related amenities; hence, are usually on the "front-line" during the planning and budgeting phases, which this Standard will support. Given that the factors that affect the nature and extent of flooding extend beyond municipal boundaries, other levels of government and flood stakeholders are also involved to varying degrees and roles. Users of this Standard could include
The guidance provided in this Standard applies to municipalities and other authorities having jurisdiction who are responsible for establishing budgets and programs to assess and manage flood risks within residential and mixed-use areas within their watersheds. Through the application of the provisions in this Standard, municipalities will be better informed as to where the locations of highest flood risk are within their limits and then to plan for logical and systematic investment, premised on a consistent and transparent protocol.
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.
| SDO | CSA: Canadian Standards Association |
| Document Number | |
| Publication Date | Jan. 1, 2021 |
| Language | en - English |
| Page Count | 71 |
| Revision Level | |
| Supercedes | |
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