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Module 2: Bioretention Area Siting and Design

Module 2: Bioretention Area Siting and Design. Andy Rowe, PE, LEED AP, QSD Cannon. Siting and Desig n Topics. Site Assessment Constraints Opportunities Site Layout Strategies Case Study – 21 st Street, Paso Robles. Site Assessment.

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Module 2: Bioretention Area Siting and Design

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  1. Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon

  2. Siting and Design Topics Site Assessment Constraints Opportunities Site Layout Strategies Case Study – 21st Street, Paso Robles

  3. Site Assessment Source: LID Technical Guidance Manual for Puget Sound • Develop a series of site assessment maps • Natural features • Built features • Non-physical characteristics

  4. Natural Site Features Source: United States Geological Survey • Topography • Site visits • As-builts • USGS maps • Topographic surveys

  5. Natural Site Features Source: Federal Emergency Management Agency • Hydrologic Features • Floodplains (FEMA) • Wetlands • Watercourses • Seeps or springs • Sensitive and Restricted Areas • Army Corps • Department of Fish and Game

  6. Natural Site Features Existing Drainage Area Delineation

  7. Natural Site Features • NRCS Maps • Soil types • Hydrologic soil groups Source: National Resources Conservation Service

  8. Natural Site Features • Geotechnical Assessment • Soil profile • Depth to impervious layer such as bedrock • Depth to groundwater • Geotechnical hazards including landslides • Infiltration rates • EPA • Soil contamination • Groundwater contamination

  9. Natural Site Features Source: Google Earth • Vegetative and Tree Cover • Site visits • Aerial photography • Topographic surveys • Arborist reports

  10. Built Site Features • Sources • GIS • As-builts • Topographic surveys • USA dig • Drainage Infrastructure • Buildings and Walls • Impervious Areas • Landscape Areas • Utilities • Groundwater Wells for Drinking Water

  11. Non-Physical Characteristics Easements Covenants Zoning/Land Use Development Code Setbacks from Buildings and Property Lines Open Space and Landscaping Requirements Historical Designations Other Pertinent Overlays

  12. Bioretention Constraints When should an underdrain be used? Impermeable Soils Groundwater Pollution or Contaminated Soils High Groundwater Impervious Soil Layer Vector Issues Geotechnical Instability Steep Slopes Coastal Bluffs

  13. Bioretention Constraints Infill, Redevelopment and High Density Land Buildings to Remain Utility Locations

  14. Bioretention Constraints Incompatibility with Surrounding Drainage System Flooding and Overflow Routes Tree Preservation ADA Considerations Safety Hydrologic Features Sensitive Areas Drinking Water Wells

  15. Bioretention Opportunities Permeable Soils Uncompacted Soils (Undeveloped Areas) Mild Slopes and Depressions

  16. Bioretention Opportunities Intersection Bulb-Outs Source: LID Technical Guidance Manual for Puget Sound

  17. Bioretention Opportunities Source: LID Technical Guidance Manual for Puget Sound Cul-de-Sacs and Loop Roads Roadway Medians

  18. Bioretention Opportunities Buffer Between Curb and Sidewalk Source: LID Technical Guidance Manual for Puget Sound

  19. Bioretention Opportunities Required Landscaping and Open Space Setbacks and Easements Source: bluegreenbldg.org

  20. Bioretention Opportunities • Combine Conveyance with Bioretention • Sinuosity

  21. Bioretention Opportunities Distribute Bioretention Areas Across the Site

  22. Site Layout Strategies • Identify the Development Envelope and Protected Areas • Limit Clearing and Grading of Native Vegetation • Incorporate established trees • Prevent Disturbance of Natural Drainage Features • Concentrate Development on Least Permeable Soils • Plan Construction to Minimize Compaction of Permeable Soils • Iterate Design

  23. Site Layout Strategies Cluster Development Source: LID Technical Guidance Manual for Puget Sound

  24. Site Layout Strategies Source: bluegreenbldg.org • Dispersal of Runoff to Pervious Areas • Direct runoff from impervious to pervious areas • Disconnect downspouts Source: LID Manual for Southern California

  25. Site Layout Strategies • Measures to Limit Imperviousness and Create Space for Bioretention • Compact, taller structures • Cluster development • Narrower streets and lanes • Reduce number of cross streets • Smaller parking lots (fewer stalls, smaller stalls, more efficient lanes) • Shared driveways

  26. Site Layout Strategies • Other Considerations • Locate bioretention areas away from high pedestrian traffic or provide elevated walkways • Sight distance • Accessibility for maintenance • Separate clean and dirty water • Complete streets • Pedestrian and ADA considerations • Bicycles • Parking • Traffic Calming

  27. Case Study: 21st St, Paso Robles Source: City of Paso Robles

  28. Case Study: 21st St, Paso Robles

  29. Case Study: 21st St, Paso Robles

  30. Case Study: 21st St, Paso Robles • Project Goals • Improve stormwater quality reaching the Salinas River • Reduce street flooding • Recharge the groundwater table • Replace aging utilities • Improve safety and mobility for pedestrians and bicycles • Shade the street with trees • Promote infill and redevelopment

  31. Case Study: 21st St, Paso Robles

  32. Case Study: 21st St, Paso Robles

  33. Case Study: 21st St, Paso Robles

  34. Case Study: 21st St, Paso Robles

  35. Case Study: 21st St, Paso Robles

  36. Case Study: 21st St, Paso Robles

  37. Case Study: 21st St, Paso Robles

  38. Case Study: 21st St, Paso Robles

  39. Case Study: 21st St, Paso Robles

  40. Case Study: 21st St, Paso Robles

  41. Andy Rowe, PE, LEED AP, QSD Cannon andyr@cannoncorp.us

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