SNC updates natural hazard maps along the Ottawa River in Prescott-Russell and Bear Brook in Ottawa

As part of its mandate to protect people and property from floods and other natural hazards, the South Nation Conservation (SNC) is updating hazard mapping for its jurisdiction along the Ottawa River and the Bear Brook catchment in the city of Ottawa.

Nature hazard maps are used by municipalities and SNC when updating official plans and planning plans and when reviewing development applications to protect people and property from floods, landslides and erosion and to guide safe and sustainable development.

Development projects within natural hazard areas such as Floods require permission from the Conservation Authority before proceeding. SNC updates nature hazard maps on behalf of its partner municipalities when requested.

“Over the past few months, SNC staff and contractors have been investigating depths and latitudes along the Ottawa River and targeting bridge and culvert dimensions in the area,” explained SNC Engineering Lead Sandra Mancini. “Preparing for mapping involves a combination of fieldwork and computer modeling.”

“We collect background data such as land use, topography and precipitation, and use this to build a computer model that calculates currents during storm events. The standard of protection is for one-in-100-year floods. This is the event that has a one percent chance of occurring each year. ”

SNC has received federal funding from the National Disaster Mitigation Program for both the Ottawa River and Bear Brook investigations with additional support from the City of Ottawa and the United States Prescott and Russell.

SNC is also working with its Ottawa Conservation Authority Partners (Mississippi Valley and Rideau Valley) to complete a flood risk assessment in each watershed. This information will help identify flood-prone areas and guide efforts to update hazard mapping.

“Once the surveys are complete and new hazard maps have been prepared, we will provide draft maps through public consultations in 2022, where residents will be invited to review and comment on the updated mapping, for both the Ottawa River and Bear Brook,” Mancini said. .

Leave a Comment