city of san jose police southside substation green roof€¦ · city of san jose police southside...
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City of San Jose Police Southside Substation
Green Roof
Mirabel Aguilar, Associate EngineerPublic Works Department
June 2, 2011
City of San Jose Police Southside Substation Project
The largest project funded by the Neighborhood Security Act Bond Measure passed in March 2002
The Police Southside Substation is located along Great Oaks Parkway at Perimeter Road north of Highway 85, southeast of Highway 101
Construction Started in February 2008
Construction Completed in October 2010 (Beneficial Use)
Construction Cost approximately $68M
Premium cost associated with the installation of a Green Roof – approximately $300K
The Green Roof was incorporated in the substation’s design and drainage plan as part of the stormwater management elements required to achieve LEED Certification
City of San Jose Police Southside Substation
City of San Jose Police Southside Substation Green Roof
City of San Jose Police Southside Substation Green Roof
Extensive Green Roof • Typically 15 – 50 pounds per square foot• Vegetated with hearty native ground cover that requires
little maintenance• Solely for environmental benefits (not an accessible roof
garden)
Green Roof / Living Roof Designer
Rana Creek Living ArchitectureMonterey, CA
City of San Jose Police Southside Substation Green Roof
Living Roof Plans requires extensive coordination between:• Architect• Living Roof / Green Roof Designer• Structural Engineer• Civil Engineer• Mechanical Engineer
Potential Credits for LEED Certification – Green Roofs• Sustainable Sites (Stormwater Management, Heat Island
Reduction) • Water Efficiency• Energy and Atmosphere• Innovation and Design Process
City of San Jose Police Southside Substation – Drainage Plan
City of San Jose Police Southside Substation Green Roof – Basin/Bioswale
City of San Jose Police Southside Substation Green Roof – Design Elements
Elements of Vegetated Areas• Waterproof membrane applied to roof area• Membrane Reinforcement (second coat)• Root Barrier/Protection Course • Drainage Mat (Geotextile fabric to convey subsurface water to drains)• Water Retention Fleece (retains added water that runs through soil medium, i.e. rainfall)• Green Roof Edge Restraints• Filter Fabric (wrapped around edge restraints)• Irrigation System• Engineered Roof Soil• Plant Material (BioTrays)
City of San Jose Police Southside Substation Green Roof – Design Elements
Elements of Vegetation Free Zones • Drainage Rock • Ornamental Rock Cover• 3-inch perforated pipe (to capture water along downslope edge and convey water to drain)
Irrigation System• Drip System• Sized to provide 50% evapotranspiration rate• System programmed to a reduced watering schedule after plant establishment period
City of San Jose Police Southside Substation Green Roof – Drainage Areas
City of San Jose Police Southside Substation Green Roof – Irrigation System
City of San Jose Police Southside Substation Green Roof - North
City of San Jose Police Southside Substation Green Roof - North
City of San Jose Police Southside Substation Green Roof – North and
South
City of San Jose Police Southside Substation Green Roof - South
City of San Jose Police Southside Substation Green Roof - South
City of San Jose Police Southside Substation Green Roof – Structural Plan
City of San Jose Police Southside Substation Green Roof – Structural
Loads
City of San Jose Police Southside Substation Green Roof – Plant List
City of San Jose Police Southside Substation Green Roof
City of San Jose Police Southside Substation Green Roof
City of San Jose Police Southside Substation Green Roof – Irrigation System
City of San Jose Police Southside Substation Green Roof – Vegetation
City of San Jose Police Southside Substation Green Roof - BioTrays
City of San Jose Police Southside Substation Green Roof
Challenges/Lessons• Designed with subsurface irrigation system so requires other
method of watering during establishment period (60-days)• Requires fall protection measures and properly trained
personnel (per Cal/OSHA requirements) to install and maintain the green roof
• Weed abatement program should be in place as soon as plant material is installed
• Include volunteer plant species list • Limited surface area to incorporate walkways and paths• Contractors should be properly trained to work in the vegetated
areas without destroying the vegetation• Proper installation of all elements of the green roof is essential
City of San Jose Police Southside Substation Green Roof
Time for a movie! ☺
Time lapse video of the green roof installation spans approximately 5 months
City of San Jose Police Southside Substation Green Roof
Questions?