developing a green infrastructure equity index to promote
TRANSCRIPT
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Developing a Green Infrastructure Equity Index to Promote Equity Planning
Megan Heckert, West Chester UniversityChristina Rosan, Temple University
VUSP PA Stormwater SymposiumOctober 14, 2015
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Two guiding premises…
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Green infrastructure provides
community benefits
above and beyond stormwater runoff
reductions
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Implementation of green infrastructure on a large
scale requires a distributed
approach.
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Given that…
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What would an equitable
distributionof green
infrastructure look like?
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Is equity equality?
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What if equity were about
need?
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How do you
measureneed?
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need=
socio-economic conditions +
the built environment
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Building the index…
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Step 1: Collect indicators
Socioeconomic• Percent minority• Percent low-income• Percent low education• Percent under 5• Percent over 64• Percent owner-occupancy
Built environment• Proximity to traffic• Ozone levels• Particulate matter• Park access• Tree canopy cover• Playground access• Percent impervious• Amount of vacant land
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Park access
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Park access
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Tree canopy cover
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Tree canopy cover
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Playground access
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Playground access
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Playground access
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Vacant Lots
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Step 2:Normalize indicators
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Index value=
block group value − minimum valuerange of values
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Step 2:Create composite score
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How does this compare to need based on a single
indicator?
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Index Values % Minority
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Index Values % Low Income
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of top 1/5 Index Values (226 block groups)
64 are in top 1/5 for percent minority122 are in top 1/5 for percent low-income33 are in top 1/5 for both
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What does this say about the distribution of GI in
Philadelphia so far?
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correlations between index scores and GI installation
density
GI Projects: .115**Tree trenches: .144**Vegetated non-tree installations: .076*Non-vegetated installations: .002
*p<.05; **p<.01
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Are there “equity voids” that do not currently have
GI installations?
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not everyone will define need the same wayor place the same valueon every index variable
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Benefits of the Index Approach
Change the conversation about equity
Provide a visual tool that communities can use
Serves as a flexible framework for weighting priorities
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Acknowledgements
• EPA – STAR grant 83555501• Art McGarity, Swarthmore College• Ben Hobbs & Fengwei Hung, Johns Hopkins
University• Claire Welty, UMBC• Shandor Szalay, AKRF