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Wetland Review
Distribution of Wetland Features / Applicability
of Preservation / Restoration on a Broad Scale
for Urban F...
Laurel Creek / City of Waterloo (Intact Centre
Wetlands Report example site for flood control)
• High percentage of wetlan...
Laurel Creek / City of Waterloo (Intact Centre
Wetlands Report example site for flood control)
• High percentage of wetlan...
Laurel Creek / City of Waterloo (Intact Centre
Wetlands Report example site for flood control)
• GRCA watershed
subcatchme...
Laurel Creek / City of Waterloo (Intact Centre
Wetlands Report example site for flood control)
• Guelph – Urban Area Has L...
Laurel Creek / City of Waterloo (Intact Centre
Wetlands Report example site for flood control)
• Brantford – Urban Area Lo...
Laurel Creek / City of Waterloo (Intact Centre
Wetlands Report example site for flood control)
• Kitchener – Urban Area Ha...
Laurel Creek / City of Waterloo (Intact Centre
Wetlands Report example site for flood control)
• Fergus – Surrounding wetl...
Laurel Creek / City of Waterloo (Intact Centre
Wetlands Report example site for flood control)
• Mississauga / Malton – no...
Laurel Creek / City of Waterloo (Intact Centre
Wetlands Report example site for flood control)
• Markham - West Thornhill,...
Laurel Creek / City of Waterloo (Intact Centre
Wetlands Report example site for flood control)
• High percentage of wetlan...
Peel/Toronto/York/Durham – low wetland contribution to local
urban catchments (1000’s of these are typically 10’s to a cou...
Laurel Creek / City of Waterloo (Intact Centre
Wetlands Report example site for flood control)
• Region of Waterloo OP pro...
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Wetland Flood Reduction - Distribution of Wetland Features and Applicability of Preservation / Restoration on a Broad Scale for Urban Flood Risk Mitigation

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This presentation was prepared to advise Green Communities Canada on the applicability of green infrastructure for flood risk reduction as part of the Ontario Urban Flooding Collaborative. It includes a review of the Intact Centre on Climate Adaptation's Laurel Creek watershed assessment (a case study in their 2017 report "When the Big Storms Hit: The Role of Wetlands to Limit Urban and Rural Flood Damage". The review suggests that the ICCA case study is atypical for both urban and rural areas in Ontario, meaning that opportunities for flood storage and damage reduction are more limited than suggested.

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Wetland Flood Reduction - Distribution of Wetland Features and Applicability of Preservation / Restoration on a Broad Scale for Urban Flood Risk Mitigation

  1. 1. Wetland Review Distribution of Wetland Features / Applicability of Preservation / Restoration on a Broad Scale for Urban Flood Risk Mitigation (review of Intact Centre Laurel Creek example and typical urban area / Ontario opportunities) Robert J. Muir, M.A.Sc., P.Eng. June 26, 2018
  2. 2. Laurel Creek / City of Waterloo (Intact Centre Wetlands Report example site for flood control) • High percentage of wetlands in Intact Centre study is atypical for Ontario Wetlands and Subcatchments per GRCA Open Data. Showing % Wetland per Subcatchment. Waterloo SPA
  3. 3. Laurel Creek / City of Waterloo (Intact Centre Wetlands Report example site for flood control) • High percentage of wetlands in Intact Centre study is atypical for Ontario SOLRIS Land Use and Ontario conditioned DEM.
  4. 4. Laurel Creek / City of Waterloo (Intact Centre Wetlands Report example site for flood control) • GRCA watershed subcatchments have low % wetlands in urban areas Subcatchments colour coded by % wetlands in the Grand River Watershed (KW Area).
  5. 5. Laurel Creek / City of Waterloo (Intact Centre Wetlands Report example site for flood control) • Guelph – Urban Area Has Low Wetland Potential SOLRIS Land Use and Ontario DEM flow paths in urban areas.
  6. 6. Laurel Creek / City of Waterloo (Intact Centre Wetlands Report example site for flood control) • Brantford – Urban Area Low Wetland Potential (Urban Area is a high point) SOLRIS Land Use and Ontario DEM flow paths in urban areas.
  7. 7. Laurel Creek / City of Waterloo (Intact Centre Wetlands Report example site for flood control) • Kitchener – Urban Area Has Low Wetland Potential (Sandrock Greenway) SOLRIS Land Use and Ontario DEM flow paths in urban areas.
  8. 8. Laurel Creek / City of Waterloo (Intact Centre Wetlands Report example site for flood control) • Fergus – Surrounding wetlands do not contribute to local urban drainage SOLRIS Land Use and Ontario DEM flow paths in urban areas.
  9. 9. Laurel Creek / City of Waterloo (Intact Centre Wetlands Report example site for flood control) • Mississauga / Malton – no wetlands contributing to urban area SOLRIS Land Use and Ontario DEM flow paths in urban areas. Malton Hwy 427 Hwy 401
  10. 10. Laurel Creek / City of Waterloo (Intact Centre Wetlands Report example site for flood control) • Markham - West Thornhill, Don Mills Channel no wetlands contributing Hwy 404 Hwy 407
  11. 11. Laurel Creek / City of Waterloo (Intact Centre Wetlands Report example site for flood control) • High percentage of wetlands is atypical for Ontario – Laurel Creek 17.6% (86% of GRCA subcatchments have lower wetland percentage – Laurel Creek is not typical / average) • Urban % wetland and opportunities are much lower • Intact Centre example has 540 ha wetlands in 5631 ha basin – about 10% of land above SPA (ATYPICAL) • Waterloo SPA flood damage centre downstream is atypical (construction of Laurel reservoir)
  12. 12. Peel/Toronto/York/Durham – low wetland contribution to local urban catchments (1000’s of these are typically 10’s to a couple 100 hectares in size) 300+ Urban Catchments in Markham, Average 55 hectare size
  13. 13. Laurel Creek / City of Waterloo (Intact Centre Wetlands Report example site for flood control) • Region of Waterloo OP protects greenspace including Laurel Creek Headwaters • City of Waterloo OP Section 8.2.3 (5): “Future expansions of the Urban Area Boundary are not permitted into the Laurel Creek Headwaters Environmentally Sensitive Landscape.” https://www.waterloo.ca/en/contentresources/resources/government/OP_Nov2016 _Consolidated_version.pdf

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