keep it on the roof - michigan...ballard library, seattle, wa . green roof award of excellence 2006...
TRANSCRIPT
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Keep It on the Roof: Designing Green Roofs for Maximum Stormwater Performance Great Lakes & St. Lawrence Green Infrastructure Conference May 31- June 2, 2017, Detroit, MI
David Yocca, FASLA, AICP, LEED AP
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Big Sur Award of Excellence 2009
Winner: Fred Ballerini
Member-based non-profit industry association established in 1999.
Mission To increase the awareness of the economic, social and environmental benefits of green roofs and green walls, and other forms of living architecture in North America through education, advocacy, professional development and celebrations of excellence.
Phoenix Convention Center Phoenix, AZ
Award of Excellence 2011 Winner: Ten Eyck Landscape Architects, Inc.
About Green Roofs for Healthy Cities (GRHC)
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• Events • Forums • Webinars • Specialized Training • Networking
• Brand Positioning • Valuation Tools • Publications • Reports
Activities
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• Building Resilience and Equity Across Cascadia
• Seattle, WA: September 18th to 21st • Policy, Design & Case Studies, and
Research presentation tracks • Trade show • Training courses & GRP accreditation exam • Awards of Excellence ceremony • Green roof and wall tours • Earn continuing education credits from AIA
CES, LA CES, and more! • www.citiesalive.org
Ballard Library, Seattle, WA Green Roof Award of Excellence 2006 Winner: American Hydrotech, Inc
CitiesAlive: 15th Annual Green Roof and Wall Conference
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• Spring 2018 – Toronto, Ontario • Green Infrastructure Policy,
Economics, Performance, Case Studies, Products, and Best Practices in the Great Lakes Region
• Networking, expert speakers, training, tours, trade show
Grey to Green: Making Better Infrastructure Decisions
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• Green Roof Professional 3-day equivalent Design/Installation Waterproofing/Drainage Plants/Growing Media
• Net Zero Water for Buildings and Sites 2-day equivalent Push the boundaries of sustainable water use
• Online, self-paced training greenroofs.org/education
Online Training
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Activities: - Green Infrastructure Charrette - Living Architecture Performance Tool - Workshops and Training - Conferences
GIF partners with communities to create healthy, resilient, and sustainable places
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Opportunity Millions of square feet of roof surfaces will either be created (new buildings), or need to be replaced, rebuilt, or substantially remodeled in the next few decades.
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Opportunity Many of these buildings are in critical watersheds that experience flooding and water quality problems.
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Opportunity Green roofs can reduce stormwater runoff, improve water quality, AND provide other benefits.
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Growing medium
Media separator
Drainage layer
Water proofing
Roof deck
Ecological Green Roof Systems Evapotranspiration, detention, cooling
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IEPA/CDF Green Roof Monitoring Project Elmhurst, Illinois
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IEPA/CDF Green Roof Monitoring Station Elmhurst, IL
Hydrological Response Research
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1 2 3 4 5 8 9 10
September 22, 2006 rain event totaling 0.75 inches
IEPA/CDF Green Roof Monitoring Station Elmhurst, IL
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IEPA/CDF Green Roof Monitoring Station Elmhurst, IL
Water Management, Energy Savings, Food Production
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On average, CDF has saved $1,384.99 per year on cooling costs since installing the green roofs due to a reduction in the number of Kwh used per degree day.
Building heating + cooling data
IEPA/CDF Green Roof Monitoring Station Elmhurst, IL
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Strategies To achieve optimum stormwater performance
with green roofs 1. Engage professionals (accredited
GRP) with expertise in green roofapplications- design/engineering,construction, operations andmaintenance
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Chicago City Hall Demonstration Rooftop Garden Chicago, Illinois
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Strategies To achieve optimum stormwater performance
with green roofs 2. Adapt system technology to
building, site, local climate, programs, and other specific conditions
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Strategies To achieve optimum stormwater performance
with green roofs 3. Optimize depth of growing
medium and evapotranspirationpotential of vegetation to maximizestormwater retention
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Water- •Slow, cool, cleanse, and evapotranspire (or re-use) rainwater on the roof to the degree possible •Balance Water Use with Supply On-Site •Minimize use of potable water for sustenance
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Retention of 80-95 percent rain event results in keeping a half million gallons annually from discharging into City storm system
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Ecosystem approach- •Establish habitat- Soil, Nutrients, Vegetation, Water, Maintenance regimes •Maximize biodiversity and system stability
20,000 individual plants of 150 different species were installed initially; system has evolved over time
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Northwest Corner
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Early Summer 2002
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Northwest Corner
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Mid Summer 2004 Photo: City of Chicago Web Site
Northwest Corner
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Transformed Plant Composition
Mid Summer 2007
Phot
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Some, (minimal) supplemental water is beneficial for initial establishment AND long-term sustenance of many of the plantings; water can be sourced from harvested rainwater, AC condensate, and /or other non-potable sources
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Strategies To achieve optimum stormwater performance
with green roofs
4. Integrate green roof with building and site systems for greatest potential benefit
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Your logo
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Energy- •Reduce urban heat island•Mitigate rapid climate change•Minimize heat gain/improve building envelop•Maximize opportunities for renewable energy systems
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August 9, 2001, at 1:45 pm, with ambient air temperature in the 90's, the following measurements were observed:
Temperature over standard roof: 169°F Temperature over green roof: 91-119°F Temperature difference: ≥60°F
Estimates for energy savings approximately $60K per year (primarily cooling)
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Health and Well-Being •Air Quality •Food •Visual and Physical Access to Outdoor Environment- Biopheli Qualities •Education
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ASLA Headquarters Green Roof Demonstration Washington DC
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Site conditions
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Stormwater Performance Retention: The ASLA green roof retained 77% of rainfall during initial monitoring period Water Quality: A significant reduction in nitrogen was measured initially, and overall water quality improves as the system matures
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Your logo
Ann Arbor Municipal Center Ann Arbor, Michigan
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Systems Integration Green roofs are part of an overall rainwater management approach to balance water on-site to the degree possible, and maximize vegetation and public amenity with minimal water and energy use.
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Ann Arbor Municipal Center Ann Arbor, Michigan
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Keep It on the Roof: Designing Green Roofs for Maximum Stormwater Performance Great Lakes & St. Lawrence Green Infrastructure Conference May 31- June 2, 2017, Detroit, MI
David Yocca, FASLA, AICP, LEED AP
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Rooftop Urban Agriculture is a success, multiple varieties of fruits and vegetables can be grown
Deeper media (6-8”) allows for native prairie grasses and perennials to succeed
IEPA/CDF Green Roof Monitoring Station Elmhurst, IL
Rooftop urban agriculture
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• Why do we need it? • Living architecture is complex
The Living Architecture Performance Tool
Brooklyn Grange urban agriculture green roof. Brooklyn NY.
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Complexity leads to barriers • Inconsistent policy • Insufficient product testing • A lack of performance
benchmarks • A lack of representation of living
architecture in existing building rating systems
The Living Architecture Performance Tool
Chicago City Hall. Chicago, IL.
EcoCenter at Heron’s Head Park San Francisco, CA.
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• Mission: Develop consensus-based performance criteria and metrics for all major types of living architecture to ensure that living architecture projects will achieve certain performance benefits, so that they can be funded and implemented with confidence.
The Living Architecture Performance Tool
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• Approach: • Align with and help
inform other rating systems like LEED and SITES
• Work with policy makers to help them craft effective policy based on performance
The Living Architecture Performance Tool
Corus Entertainment interior living wall. Toronto, ON.
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Approach: • White papers in subject areas of performance • Draft framework in progress
Questions? Want to get involved? • Rohan Lilauwala: [email protected]
The Living Architecture Performance Tool