Green Roofs and Cycles in Nature

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					Equity of Green Infrastructure
        Arlington, VA




       Source: Arlington, VA County Website
Arlington’s Green Status
 Named top ten green roof city by Green
  Roofs Organization
 Green building incentive program (density
  bonuses)
 Urban forest master plan calls for 41%
  green cover in Arlington
 Given Tree City USA status
 Should continue to push green trends in
  order to become a model city
 Benefits of Green Infrastructure

 Improved   health
 Increased productivity, increased quality of life
 Valuable public space
 Biodiversity
 Storm water retention
 Pollutant sequestration
 Psychological benefits
 Reduced energy costs
                               Source: www.gardenvisit.com
                                 Analysis of
  Arlington                        Data                                 Green Roof
  Land Use                                                            Recommendations
                                Canopy Cover
                                 and Poverty                             Add canopy cover layer
                                                                         and building shapefile
 Add blockgroups and Census 2000 SF3 table
                                                                 Select buildings with roof areas
 Join Census 2000 SF3 table to census                                of 6,000 ft2 and greater.
     shapefile based on blockgroup                                    Adjust color to green

   Choropleth of Poverty Status
                                                                Analyze map without and with
      Add canopy cover layer                                     recommended green roofs

   Set transparency and contrast                            Add new green roof area to existing
                                                                   area of vegetation
Analyze trends between canopy cover
         density and poverty                             Calculate cost of recommended green
                                                                         roofs.
            Calculate benefits: storm water retention rates, energy savings rates, and particulate
                                      matter sequestration rates per ft2
Map designed by Jenny Jones, 2006
Data Source: Arlington County 2006
                                      Arlington, VA
                                     Without Proposed
                                       Green Roofs




Map designed by Jenny Jones, 2006
Data Source: Arlington County 2006
                                     Arlington, VA
                                     With Proposed
                                      Green Roofs




Map designed by Jenny Jones, 2006
Data Source: Arlington County 2006
  Proposed Green Roof Costs
 $8/sftfor most basic green roofing
   $294,522,036 to pay for proposed
    green roofs

 $15/sftfor mid-range green roofing
   $552,228,818 to pay for proposed
    green roofs
Proposed Green Roof Benefits
   Removal of 684,395 kg of particulate
    matter from the air each year

   Retention of 18,407,627 gallons of rain
    water during an average rainstorm.

   Estimated savings of $7,363,050 per year
    in air conditioning costs
       Problems with Analysis
 No  standard for measurement of
  urban green infrastructure
 Difficult to map vegetation layer with
  other data
 Lacked means of clipping raster data
 Green roof area calculations inflated
 Cost/Benefit Analysis of green roof
  inaccurate

				
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posted:9/19/2011
language:English
pages:17