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From a Stormwater Study to a Community Resilience Toolkit

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From a Stormwater Study to a Community Resilience Toolkit

  1. 1. From a Stormwater Study to a Community Resilience Toolkit NOVEMBER 16, 2022 An Unexpected Journey to Make a Case for Trees
  2. 2.  Overview of the Project Journey  Exploration of Project Phase I  Exploration of Project Phase II  Review Resources 2 Presentation Outline
  3. 3. 3 The Journey • Understand the role of forests in PNW hydrological cycle • Goals  Quantify the role of trees and forest cover in mitigating stormwater runoff  Compare and contrast two hydrology models  Encourage a co-benefits strategy • Prepare and Promote Resources  Technical Report  Handbook  Regional Toolkit of resources
  4. 4. Phase I Puget Sound Trees & Stormwater Project 4
  5. 5. Trees and Stormwater 5
  6. 6. • Pilot City Tree Canopy Assessments • i-Tree Hydro and WWHM Analysis and Comparison • Technical Report • Handbook Phase I Outputs 6 www.trees-and-stormwater.org
  7. 7. Section 1 - Multiple benefits of urban trees Section 2 – Summary of Technical Report Section 3 – Case Studies of collaboration Section 4 – References and more Resources Handbook 7
  8. 8. 8 Benefits: Stormwater Pre-Development
  9. 9. 9 Stormwater Post Development
  10. 10. Benefits: Carbon Cycle 10
  11. 11. Benefits: Urban Forest 11 Human Health Air Quality Mitigates Heat Island Effect Wildlife Habitat Noise & Wind Buffer Community Livability Equity Biodiversit y
  12. 12. • Four pilot communities Kirkland, Tacoma, Snohomish, Kent • Two hydrology models i-Tree Hydro, WWHM • Four spatial scales city, drainage basin, neighborhood, site • Three scenario variables  Loss of tree canopy  Change of canopy and land cover with development  Increase of tree canopy Model Analysis Summary 12
  13. 13. Key Findings 13 1. Canopy Loss, Benefit Loss 2. Canopy over Impervious Surfaces 3. Tree Retention during Development 4. Higher Canopy Cover, Benefit Buffer 5. Runoff Volume-based Model Comparison
  14. 14. 14 Scenarios where tree canopy is replaced (1A, 1B, 2A, and 2B) with any other land cover type (herbaceous, shrub, impervious) increases runoff volume. Recommendation – Retain and plant trees wherever possible (overhanging impervious areas, increasing canopy over pervious areas) to reduce stormwater runoff volume and pollution loads Key Finding 1 Photo Credit: National Association of Conservation Districts
  15. 15. 15 An increase in tree cover over impervious surfaces results in decreased runoff volumes. Recommendation – Plant trees to overhang impervious surfaces for high stormwater runoff and pollution reduction benefits www.seattleweekly.com/news/will-seattle-finally-protect-its- tree-canopy Key Finding 2
  16. 16. 16 Development that includes tree retention results in reduced runoff volume compared with development without tree retention. Recommendation – Retain existing trees during new development and redevelopment for higher stormwater runoff and pollution reduction benefits Key Finding 3 Photo Credit: Nashville Conservation Corps
  17. 17. 17 From Conversations to Collaboration
  18. 18. • Community Priorities • Case Studies • Co-Design for Co-Benefits 18 Collaboration Themes
  19. 19. 19 Section 4: Resource Compendium
  20. 20. Phase II Community Resilience Toolkit 20
  21. 21. Phase II - Toolkit 21 Trees & Stormwater Toolkit (2019) Web-based compendium of resources for municipal urban forestry and stormwater collaboration • Technical Report and Handbook • Identify resource gaps • Tree-related equity • Resources for climate response • Regional case studies and resources
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  31. 31. • Study to quantify tree canopy in mitigating stormwater runoff in PNW • Handbook encourages collaboration and co-design between urban foresters and stormwater managers • Explore the intersection of trees with equity, human health and climate change…and beyond • Toolkit • Visual portrayal of how trees can be integrated into community resilience • Comprehensive collection of resources, considerations and models by essential components • Two local success stories to demonstrate the different journeys to success 34 Project Journey
  32. 32. Snohomish CD outreach@snohomishcd.org Printed Handbook 35 Online Access to Toolkit, PDF Handbook & Technical Report​ www.betterground.org/urban-forests​ www.trees-and-stormwater.org Printed Technical Report King CD district@kingcd.org Project Resources
  33. 33. This project has been funded wholly or in part by the United States Environmental Protection Agency under assistance agreement PC-01J18101 to the Washington State Department of Ecology. WA DNR Urban and Community Forestry  Washington Stormwater Center Kathleen Wolf, PhD University of Washington Pierce, King, Snohomish Counties - Surface Water Puget Sound Conservation District Caucus Pierce, King, Snohomish & Whatcom Conservation Districts Phase I Pilot Cities of Kirkland and Tacoma Cities of Snoqualmie and Edmonds Stewardship Partners  The Nature Conservancy - Washington King County - Cities Climate Collaboration (K4C) And Funders! 36 Thank You Project Partners!
  34. 34. QUESTIONS? 37 Brandy Reed b.reed@whatcomcd.org District Manager Whatcom Conservation District Elizabeth Walker ewtreelady@gmail.com Principal Terra Firma Consulting

Hinweis der Redaktion

  • Water Quallity and Quantity
    Stormwater runoff reduction
    Better soil infiltration and capacity
    Erosion control stabilizing soil/slopes
    Phytoremediation of pollutants
  • Project Goal - Support collaboration across professional sectors (UF/Stormwater)
    Tech Report & Handbook
    Present on all the work using the Handbook as a guide
  • Water Quallity and Quantity
    Stormwater runoff reduction
    Better soil infiltration and capacity
    Erosion control stabilizing soil/slopes
    Phytoremediation of pollutants

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