On October 10, 2014 ICLR conducted a Friday Forum workshop on the state of floodplain mapping in Canada. Public Safety Canada is the lead federal agency responsible for disaster prevention and mitigation. In response to increases in flood intensity and flood damage over the past number of years, PSC has completed the National Floodplain Mapping Assessment. The Assessment includes three parts: a review of international practices, the state of flood hazard mapping across Canada including the cost of updating the and mapping to proposed standards, and a Framework that established state-of-the-art standards for both the update of flood hazard mapping and the development of national flood risk data base. This presentation focused on the National Floodplain Management Framework including the proposed mapping standards, anticipated implementation steps, and the scope and intent of the flood risk database.
The second half of the presentation focused on recent advancements in effectively defining urban overland flood risk. Urban overland flooding is caused by intense rainfall events in areas where there is insufficient storm sewer system capacity and poorly defined overland flow routes. Currently, across Canada urban areas prone to urban flooding are not generally defined. Moreover, in cases that are known to be flood prone the risk is rarely quantified. By better defining areas at risk, municipalities can focus efforts in effective urban overland flood mitigation.
Workshop leader Tim Mereu, Vice President of MMM Group, has responsibility for Water Resources and Environmental Services. He has thirty years of consulting experience with a focus on water resources, including flood risk management, policy and standards development, master planning, channel restoration, and storm water management. Tim was the Project Manager for the recently completed National Floodplain Mapping Assessment undertaken by Public Safety Canada.