1,647
edits
Changes
Jump to navigation
Jump to search
Line 10:
Line 10: − + − * Common in urban areas with high impervious surface coverage. + − − * "Flash flooding" is when intense rainfall overwhelms drainage systems, leading to sudden surface flooding. This can be common in dense urban environments where water cannot infiltrate quickly. − + − + − * "Flash flooding" may occur in steep river catchments, where rapid runoff accumulation causes sudden rises in water levels. − + − * "Flash flooding" is less common, but can occur when extreme rainfall occurs throughout the watershed.
→Introduction
[[File:Reflecting-on-the-devastating-2013-storm-mississauga-takes-lead-in-municipal-flood-resilience-the-pointer-be39ea9b.jpg|300px|thumb|right|Street flooding in Mississauga (The Pointer, 2023)<ref>The Pointer. 2013. Reflecting on the devastating 2013 storm, Mississauga takes lead in municipal flood resilience. https://thepointer.com/article/2023-07-30/reflecting-on-the-devastating-2013-storm-mississauga-takes-lead-in-municipal-flood-resilience</ref>.]]
[[File:Reflecting-on-the-devastating-2013-storm-mississauga-takes-lead-in-municipal-flood-resilience-the-pointer-be39ea9b.jpg|300px|thumb|right|Street flooding in Mississauga (The Pointer, 2023)<ref>The Pointer. 2013. Reflecting on the devastating 2013 storm, Mississauga takes lead in municipal flood resilience. https://thepointer.com/article/2023-07-30/reflecting-on-the-devastating-2013-storm-mississauga-takes-lead-in-municipal-flood-resilience</ref>.]]
|
|
* Caused by extreme rainfall exceeding soil infiltration and storm sewer capacity.
* Caused by intense rainfall that exceeds soil infiltration and storm sewer capacity, especially in urban areas with impervious surfaces.
* Poor drainage and outdated infrastructure worsen impacts.
* Exacerbated by poor drainage and outdated stormwater infrastructure.
|-
|-
! Fluvial (riverine) flooding
! Fluvial (riverine) flooding
| [[File:Screenshot 2025-09-22 100405.png|300px|thumb|right|Don River floods DVP (City News, 2024)<ref>City News. 2024. From the scene: Don Valley River floods section of DVP, stranding drivers. https://www.youtube.com/watch?v=fbyaYZy0d0A&t=68s</ref>]]
| [[File:Screenshot 2025-09-22 100405.png|300px|thumb|right|Don River floods DVP (City News, 2024)<ref>City News. 2024. From the scene: Don Valley River floods section of DVP, stranding drivers. https://www.youtube.com/watch?v=fbyaYZy0d0A&t=68s</ref>]]
|
|
* Occurs when rivers overflow their banks due to heavy rainfall or snowmelt.
* Occurs when rivers overflow due to heavy rain or snowmelt.
* Worsened by upstream land use changes that increase runoff.
* Runoff from upstream land use changes can worsen flooding
|-
|-
! Coastal (shoreline) flooding
! Coastal (shoreline) flooding
|[[File:Screenshot 2025-09-19 115121.png|300px|thumb|right|Lake Ontario floods Toronto Island (Toronto Life, 2017)<ref>Toronto Life. 2017. Flooding on the Toronto Islands is terrible—but also weirdly beautiful. https://torontolife.com/life/flooding-toronto-islands-terrible-also-weirdly-beautiful/</ref>]]
|[[File:Screenshot 2025-09-19 115121.png|300px|thumb|right|Lake Ontario floods Toronto Island (Toronto Life, 2017)<ref>Toronto Life. 2017. Flooding on the Toronto Islands is terrible—but also weirdly beautiful. https://torontolife.com/life/flooding-toronto-islands-terrible-also-weirdly-beautiful/</ref>]]
|
|
* Driven by storm surges, and/or lake-level rise.
* Driven by storm surges and lake-level rise.
* More common in areas with poor shoreline protection.
* More common in areas with poor shoreline protection.
|}
|}