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Line 164: − [[File:Screenshot 2025-09-10 112659.png|400px|thumb|right|TRCA’s regulatory flood plain map (TRCA, 2025)<ref>TRCA. 2025. TRCA Flood Plain Map. https://trca.ca/conservation/flood-risk-management/flood-plain-map-viewer/#use-now</ref>. As directed by the Province, the regulatory flood event standard applicable within TRCA’s jurisdiction is the greater of Hurricane Hazel or+ − The 100-year storm (TRCA, 2025)<ref>TRCA. 2025. How Does TRCA Define Flood Risk? https://trca.ca/conservation/flood-risk-management/defining-flood-risk/</ref>.]] −
→Climate planning at different scales
==Climate planning at different scales==
==Climate planning at different scales==
[[File:Screenshot 2025-09-10 112659.png|400px|thumb|right|TRCA’s regulatory flood plain map (TRCA, 2025)<ref>TRCA. 2025. TRCA Flood Plain Map. https://trca.ca/conservation/flood-risk-management/flood-plain-map-viewer/#use-now</ref>. As directed by the Province, the regulatory flood event standard applicable within TRCA’s jurisdiction is the greater of Hurricane Hazel or
The 100-year storm (TRCA, 2025)<ref>TRCA. 2025. How Does TRCA Define Flood Risk? https://trca.ca/conservation/flood-risk-management/defining-flood-risk/</ref>.]]
===Site scale===
===Site scale===
Individual sites can be assessed for climate change risk by evaluating stormwater systems for components vulnerable to projected changes in precipitation patterns. This includes considering increased frequency or intensity of system responses beyond design expectations, such as pipe surcharging, nuisance flooding, overtopping of storage facilities, erosion, failure to meet water quality or temperature targets, impacts on sensitive wetlands, and interactions with wells and septic systems (MECP, 2022)<ref name = MECP2022></ref>.
Individual sites can be assessed for climate change risk by evaluating stormwater systems for components vulnerable to projected changes in precipitation patterns. This includes considering increased frequency or intensity of system responses beyond design expectations, such as pipe surcharging, nuisance [[flooding]], overtopping of storage facilities, [[erosion]], failure to meet [[water quality]] or [[Stormwater Thermal Mitigation|temperature targets]], impacts on sensitive [[wetlands]], and interactions with [[wells]] and septic systems (MECP, 2022)<ref name = MECP2022></ref>.
For sites with an existing stormwater management plan, it can be valuable to assess how much resiliency was incorporated into the system at the time of design by evaluating these thresholds. For instance, pipes may have additional capacity beyond the design return period depending on their installed size (MECP 2022)<ref name = MECP2022></ref>.
For sites with an existing stormwater management plan, it can be valuable to assess how much resiliency was incorporated into the system at the time of design by evaluating these thresholds. For instance, [[pipes]] may have additional capacity beyond the design return period depending on their installed size (MECP 2022)<ref name = MECP2022></ref>.
Climate change and SWM LID BMPs will affect site land use types differently. To view different LID opportunities for each unique land use type, please view the subsequent pages linked below:
Climate change and SWM LID BMPs will affect site land use types differently. To view different LID opportunities for each unique land use type, please view the subsequent pages linked below:
===Watershed scale===
===Watershed scale===
Climate change is expected to alter overall watershed behavior, including [[Winter Management|snow accumulation]], spring freshet timing, streamflow patterns, evapotranspiration, groundwater recharge, [[wetland]] hydroperiods, and the frequency and severity of drought. Hydrologic models can be developed and applied at the watershed or subwatershed scale to assess the impacts of climate change on both groundwater and surface water systems (MECP, 2022)<ref name = MECP2022></ref>.
Climate change is expected to alter overall watershed behavior, including snow accumulation, spring freshet timing, streamflow patterns, evapotranspiration, groundwater recharge, [[wetland]] hydroperiods, and the frequency and severity of drought. Hydrologic models can be developed and applied at the watershed or subwatershed scale to assess the impacts of climate change on both groundwater and surface water systems (MECP, 2022)<ref name = MECP2022></ref>.
===Municipal and provincial scale===
===Municipal and provincial scale===