September 26, 2017 by Angela Stelmakowich
Research out of the University of Waterloo recommends a Canadian standard for new flood-resilient residential communities, one that employs almost two dozen best practices, be developed to bolster protection and reduce water-related losses.
Requiring that new homes not be built in floodways or in the flood fringe unless flood-proofing addresses related risks is just one of the best practices detailed in the report, Preventing Disaster Before It Strikes: Developing a Canadian Standard for Flood-Resilient Residential Communities, issued Tuesday.
Funded by the Standards Council of Canada (SCC) and conducted by the Intact Centre on Climate Adaptation (ICCA), the research by ICCA’s Natalia Moudrak and Blair Feltmate identifies 20 best practices aimed at designing and building more flood-resilient new residential communities.
Beyond building location, though, the report’s “Design for Resilience” recommendations also cite the need for the following:
Developed following consultation with municipal storm water management experts, engineering consultants, developers, insurers and homebuilders, the best practices take into consideration riverine flooding, overland flooding, storm and sanitary sewer surcharge, drainage system failures and groundwater seepage.
The measures seek to cap losses – both insured and uninsured – resulting from storm events Canada-wide.
These events carry financial and emotional tolls amounting to millions of dollars in property damage and untold stress to homeowners. In all, 1.7 million Canadian households are at risk of riverine and overland flooding, ICCA reports in a statement, citing figures released by Insurance Bureau of Canada.
Water-related losses are creating several concerns that must be addressed, the report notes, including the associated financial and mental health stress; insurable risk that could spur higher premiums or insurance availability issues; the possibility of mortgage defaults for homeowners with limited coverage who are unable to pay for flood damage; legal risks flowing from lawsuits for homeowners, developers, municipalities, provinces and insurers; and the possible negative impact on municipal credit ratings.
The report also offers recommendations on storm sewer design, sanitary sewer design, street design, wastewater pumping station design and preservation of natural features. Some specific recommendations in those categories include the following:
“Ensuring that new communities are built under the direction of these practices is necessary to combat ever-worsening extreme weather that, if not addressed, will result in costly and unremitting flood damage,” states the report.
“These best practices constitute elements of residential community design and construction that, if implemented together, should achieve significant flood risk reduction,” the report adds.
SCC, as a next step, will “commit additional funding toward the development of a national standard on how to build flood-resilient communities, based on the best practices,” notes the joint statement.
“This important work provides the foundation for developing a standardization solution that meets stakeholder needs and helps protect one of the most valuable assets of Canadians,” SCC CEO John Walter adds in the statement.
A standard would also promote greater consistency. Communities across Canada use different approaches to address flood management, the report notes. Differences are only enhanced by the fact that “provinces and territories adopted different target ‘levels of service’ or ‘levels of risks’ to guide flood management,” it adds.
“The notable differences in these definitions and in regulatory flood standards through Canada can add to uncertainty about acceptable flood risks in the country and can hinder national efforts to streamline flood management in Canada,” the report states.
“A national standard for flood-resilient residential community design can help local governments, developers, homebuilders, design professionals and contractors to better understand the minimum expected design and construction requirements for building new residential subdivisions that are less prone to flooding,” it emphasizes.
The report notes that benefits of such an approach include the following:
“With the larger storms that we are seeing today, and the bigger ones that are coming, those who purchase homes in communities built in line with these recommendations will also be buying some peace of mind every time it rains,” Blair Feltmate (pictured left), a professor in the University of Waterloo’s Faculty of Environment and head of ICCA, says in the statement.
ICCA is seeking input by Oct. 31 on the effectiveness of the best practices to reduce flood risk and their practicality for implementation. The centre also welcomes suggestions for additional best practices from municipalities, building practitioners and other interested parties on how to bolster the flood resiliency of new communities.
“On behalf of Canada’s property and casualty insurers, IBC welcomes this report and we support the hard work led by the ICCA and the SCC,” Don Forgeron (pictured right), president and CEO of IBC, tells Canadian Underwriter.
“We need our communities across Canada to be more resilient when faced with flooding. Setting standards for new community construction is a good first step. Governments across Canada, and organizations like IBC, the ICCA and the SCC, need to work together and lead a ‘whole of society’ approach to reduce risks for consumers in a thoughtful and considered way,” Forgeron continues.