How To Direct Stormwater into Silva Cells

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On-site stormwater management and mimicking pre-development hydrology are becoming increasingly important design imperatives at every level. Trees and soils in suspended pavements are part of the …

On-site stormwater management and mimicking pre-development hydrology are becoming increasingly important design imperatives at every level. Trees and soils in suspended pavements are part of the toolkit for implementing meaningful stormwater control measures.

This presentation walks through some of the most common techniques for directing stormwater into Silva Cells, including: catch basins, sheetflow/curb cuts, and pervious pavement. Each technique is examined using real-life project examples that address the logic behind each design, including: project goals, pre-treatment, water distribution, and maintenance.

For further information on these topics, please refer to the recorded webinar found at the end of the presentation, which includes a detailed Q & A with expert panelists on the subject

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  • 1. TECHNIQUES FOR DIRECTING WATER INTO SILVA CELLS Tuesday, June 17th, 2014 PRESENTED BY: Marcy Bean Sustainable Landscape Architect With Panelists: Peter MacDonagh, Kestrel Design Group Michael James, DeepRoot
  • 2. Techniques for Directing Water into Silva Cells Presentation Overview: • Why use the Silva Cells for Stormwater Management? • Critical Considerations for using the Silva Cells for Stormwater Management • Method of Stormwater Capture with Case Studies • Porous Pavement • Marq2 Streetscape • Sheet Flow/Curb Cuts • 2nd Avenue Streetscape • Catch Basins/Sumps • NCSU Monitoring Site • Questions & Answers with Panelists 1Techniques for Directing Water into Silva Cells
  • 3. Why use the Silva Cells for Stormwater Management? Tree Soil System – Bioretention • TSS Removal • Pretreatment • Pollutant removal • Rate Reduction • Slow runoff, or take offline • Storage • Design dependent • Tree Growth • Evapotranspiration & Interception 2Image from Aurora Streetscape, Shoreline, Washington – Photo by DeepRoot
  • 4. Why use the Silva Cells for Stormwater Management? Critical Considerations: • Adapt to your site • Project Goals • Treatment/Storage • Design & Size per Project • Offline • Small storms 3Why use the Silva Cells for Stormwater Management?
  • 5. Techniques for Directing Water into Silva Cells Three features in almost every Silva Cell project for Stormwater: • Pretreatment • Distribution • Overflow 4Image from http://www.aerosnow.com/dejanaservices/catch-basin.html Many variations available
  • 6. Techniques for Directing Water into Silva Cells Method of Stormwater Capture with Case Studies Porous Pavement Marq2 Streetscape Sheet Flow/Curb Cuts 2nd Avenue Streetscape Catch Basins/Sumps NCSU Monitoring Site 5Techniques for Directing Water into Silva Cells
  • 7. METHOD OF CAPTURE #1 – POROUS PAVEMENT Keep it simple.
  • 8. Method of Capture: Porous Pavement Porous Pavement 7 Keep it simple. Pretreatment Distribution Overflow
  • 9. Case Study: Porous Pavement Marquette & 2nd Avenues (Marq2) Minneapolis, Minnesota On-site stormwater management through porous pavers and infiltration through the Silva Cell system. Average soil volume per tree: 587 ft3 Catchment area: 1.15 acres Number of trees: 167 Total Silva Cells: 4,909 frames, 9,818 decks Installation date: 2008-2009 Project Designer: SEH and URS 8Photo taken summer 2012, Kestrel Design Group
  • 10. Method of Capture: Porous Pavement 9Marq2 Silva Cell Installation - 2009
  • 11. Method of Capture: Porous Pavement 10Marq2 Streetscape – 2009, and again in 2013
  • 12. Method of Capture: Porous Pavement 11Marq2 Silva Cell Installation, tree monitoring images by Kestrel Design Group
  • 13. METHOD OF CAPTURE #2 – SHEET FLOW / CURB CUT Raingarden concept.
  • 14. Method of Capture: Sheet Flow/Curb Cut Sheet Flow / Curb Cut 13 Raingarden concept.
  • 15. Method of Capture: Sheet Flow/Curb Cut Sheet Flow / Curb Cut 14 Raingarden concept.
  • 16. Case Study: Sheet Flow/Curb Cut 2nd Avenue Streetscape, Calgary, Alberta On-site stormwater management and data monitoring through curb cuts and distribution into the Silva Cell system. Average soil volume per tree: 19m3 (671 ft3) Catchment area: 1,235 m2 (0.3 acres) Number of trees: 7 Total Silva Cells: 470 frames, 270 decks Installation date: June 2013 Project Designer: Kestrel Design Group & Larson Engineering 15Image courtesy City of Calgary
  • 17. Method of Capture: Sheet Flow/Curb Cut 162nd Avenue Streetscape – Detail by Kestrel Design Group Pretreatment Distribution Overflow
  • 18. Method of Capture: Sheet Flow/Curb Cut 172nd Avenue Streetscape Construction – Photos by DeepRoot
  • 19. Method of Capture: Sheet Flow/Curb Cut 182nd Avenue Streetscape Construction – Photos by DeepRoot
  • 20. Method of Capture: Sheet Flow/Curb Cut 192nd Avenue Streetscape – Before and After – Photo at left by DeepRoot, photo at right courtesy City of Calgary
  • 21. METHOD OF CAPTURE #3 – CATCH BASIN Slow things down.
  • 22. Method of Capture: Catch Basin Catch Basin 21 Pretreatment Distribution Overflow Slow things down.
  • 23. Method of Capture: Catch Basin 22Catch Basin Pretreatment Distribution Overflow Slow things down.
  • 24. Catch Basin Schematic 23Image from http://www.aerosnow.com/dejanaservices/catch-basin.html Elbow Distribute to Silva Cell system Slow things down. Many variations available
  • 25. Case Study: Catch Basin North Carolina State University Stormwater Treatment Performance Monitoring Sites, Wilmington, North Carolina On-site stormwater management and data monitoring through catch basins and distribution through the Silva Cell system. Comparison of two sites, Orange Street and Ann Street Soil volume per tree: 750 ft3 Catchment area: ~0.10-0.12 acres Number of trees: 1 per treatment area Total Silva Cells: 68 frames, 34 decks Installation date: June-July 2012 Monitoring dates: Sept 2012-July 2013 Project Designer: North Carolina State University with Kestrel Design Group 24Approximate drainage area for each tree, image adapted from Page, Winston and Hunt Silva Cells Silva Cells
  • 26. Method of Capture: Catch Basin 25NC State Research Site - Image from Page, Winston and Hunt
  • 27. Method of Capture: Catch Basin 26NC State Research Site – Photos by DeepRoot
  • 28. Method of Capture: Catch Basin 27NC State Research Site – Photos by DeepRoot
  • 29. TECHNIQUES FOR DIRECTING WATER INTO SILVA CELLS Tuesday, June 17th, 2014 6/12/2014 Contact us: DeepRoot Blog: http://www.deeproot.com/blog/ info@deeproot.com marcy@tkdg.net