module 2: bioretention area siting and design andy rowe, pe, leed ap, qsd cannon
TRANSCRIPT
![Page 1: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/1.jpg)
Module 2: Bioretention Area Siting and Design
Andy Rowe, PE, LEED AP, QSD Cannon
![Page 2: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/2.jpg)
Siting and Design Topics
• Site Assessment• Constraints• Opportunities• Site Layout Strategies• Case Study – 21st Street, Paso Robles
![Page 3: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/3.jpg)
Site Assessment
• Develop a series of site assessment maps– Natural features– Built features– Non-physical characteristics
Source: LID Technical Guidance Manual for Puget Sound
![Page 4: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/4.jpg)
Natural Site Features
• Topography– Site visits– As-builts– USGS maps– Topographic
surveys
Source: United States Geological Survey
![Page 5: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/5.jpg)
Natural Site Features
• Hydrologic Features– Floodplains (FEMA)– Wetlands– Watercourses– Seeps or springs
• Sensitive and Restricted Areas– Army Corps– Department of Fish
and GameSource: Federal Emergency Management Agency
![Page 6: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/6.jpg)
Natural Site Features
• Existing Drainage Area Delineation
![Page 7: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/7.jpg)
Natural Site Features• NRCS Maps
– Soil types– Hydrologic soil groups
Source: National Resources Conservation Service
![Page 8: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/8.jpg)
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
![Page 9: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/9.jpg)
Natural Site Features• Vegetative and Tree Cover
– Site visits– Aerial photography– Topographic surveys– Arborist reports
Source: Google Earth
![Page 10: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/10.jpg)
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
![Page 11: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/11.jpg)
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
![Page 12: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/12.jpg)
Bioretention Constraints• Impermeable Soils• Groundwater Pollution or Contaminated Soils• High Groundwater• Impervious Soil Layer• Vector Issues• Geotechnical Instability• Steep Slopes• Coastal Bluffs
When should an underdrain be used?
![Page 13: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/13.jpg)
Bioretention Constraints
• Infill, Redevelopment and High Density Land
• Buildings to Remain• Utility Locations
![Page 14: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/14.jpg)
Bioretention Constraints
• Incompatibility with Surrounding Drainage System
• Flooding and Overflow Routes• Tree Preservation• ADA Considerations• Safety• Hydrologic Features• Sensitive Areas• Drinking Water Wells
![Page 15: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/15.jpg)
Bioretention Opportunities
• Permeable Soils• Uncompacted Soils (Undeveloped Areas)• Mild Slopes and Depressions
![Page 16: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/16.jpg)
Bioretention Opportunities• Intersection Bulb-Outs
Source: LID Technical Guidance Manual for Puget Sound
![Page 17: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/17.jpg)
Bioretention Opportunities• Cul-de-Sacs and Loop Roads• Roadway Medians
Source: LID Technical Guidance Manual for Puget Sound
![Page 18: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/18.jpg)
Bioretention Opportunities• Buffer Between Curb and Sidewalk
Source: LID Technical Guidance Manual for Puget Sound
![Page 19: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/19.jpg)
Bioretention Opportunities• Required Landscaping and Open Space• Setbacks and Easements
Source: bluegreenbldg.org
![Page 20: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/20.jpg)
Bioretention Opportunities• Combine Conveyance
with Bioretention– Sinuosity
![Page 21: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/21.jpg)
Bioretention Opportunities• Distribute Bioretention Areas Across the
Site
![Page 22: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/22.jpg)
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
![Page 23: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/23.jpg)
Site Layout Strategies• Cluster Development
Source: LID Technical Guidance Manual for Puget Sound
![Page 24: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/24.jpg)
Site Layout Strategies• Dispersal of Runoff to Pervious Areas
– Direct runoff from impervious to pervious areas– Disconnect downspouts
Source: bluegreenbldg.org
Source: LID Manual for Southern California
![Page 25: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/25.jpg)
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
![Page 26: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/26.jpg)
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
![Page 27: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/27.jpg)
Case Study: 21st St, Paso Robles
Source: City of Paso Robles
![Page 28: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/28.jpg)
Case Study: 21st St, Paso Robles
![Page 29: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/29.jpg)
Case Study: 21st St, Paso Robles
![Page 30: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/30.jpg)
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
![Page 31: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/31.jpg)
Case Study: 21st St, Paso Robles
![Page 32: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/32.jpg)
Case Study: 21st St, Paso Robles
![Page 33: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/33.jpg)
Case Study: 21st St, Paso Robles
![Page 34: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/34.jpg)
Case Study: 21st St, Paso Robles
![Page 35: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/35.jpg)
Case Study: 21st St, Paso Robles
![Page 36: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/36.jpg)
Case Study: 21st St, Paso Robles
![Page 37: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/37.jpg)
Case Study: 21st St, Paso Robles
![Page 38: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/38.jpg)
Case Study: 21st St, Paso Robles
![Page 39: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/39.jpg)
Case Study: 21st St, Paso Robles
![Page 40: Module 2: Bioretention Area Siting and Design Andy Rowe, PE, LEED AP, QSD Cannon](https://reader036.vdocuments.us/reader036/viewer/2022081602/55168c455503469d698b6250/html5/thumbnails/40.jpg)
Case Study: 21st St, Paso Robles