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An AQ Assessment Tool for Local Land Use Decisions
An AQ Assessment Tool for Local Land Use Decisions
MnAPA Annual ConferenceSeptember 28, 2011
St. Cloud, Minnesota
Mark Filipi, AICP PTP
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Metropolitan Council Background
2009 legislative mandate to prepare Land Use and Planning Resources Report .
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Land Use and Planning Resources Report
Identify and assess land use & transportation strategies for 3 goals:
Reduce air pollution,Mitigate congestion, andReduce costs for operation, maintenance
or improvement of infrastructure.
Develop voluntary land use air quality assessment tool for local decision-makers.
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Air Quality Assessment Tool
Assess green house gases (along with
other criteria pollutants).
Based on local data to maximum extent possible.
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Travel Model Data RequirementsData needed to develop assessment
tool:Vehicle-miles-traveled data (VMT) –
by trip purpose and community.
VMT elasticity relationships to adjust “Base Case” VMT to “Alternative Land Use/Design Scenario” VMT based on difference between development scenarios.
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AQ Emission Rate Data Requirements
Data needed to develop assessment tool:Air pollutant emission rate data
generated with MOVES2010 using local input data from various available existing sources.
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“Base Case” Land Use VMT Data
Regional travel demand model used to estimate and tabulate baseline “Base Case” VMT.
VMT aggregated for:Home-Based,Non-Home Based, Through, andTruck Trips
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Community Aggregation TAZ based VMT aggregated to
communities based on:Existing list of community TAZs, andTAZs with only a portion in a
community – GIS used to calculate area in community and homogenous distribution of land uses assumed to exist, so TAZ total VMT multiplied by calculated percent in community.
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Calculation of VMT rates for HB and NHB Trips
Population, household and employment data taken from Council website to ensure consistency with publicly available data.
VMT for Home-Based trips divided by # of households in community.
VMT for Non-Home Based trips divided by # of employees.
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Range of Resulting VMT Rates
Definitions:
Free Standing Growth Center – typically old farm community with job opportunities commensurate with residential intensity
Rural Community – Typically a few households clustered around a crossroads with a few businesses thrown in
SubArea HB VMT per HH NHB VMT per Employee
Central City 32 19
Suburb 55 27
Free Standing Growth Center
42 22
Rural Community 93 65
Township 115 84
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Land Use Strategies and Elasticities
Travel and the Built Environment: A Meta-Analysis; Ewing and Cervero; JAPA; Summer 2010
TCRP Report 95: Traveler Response to Transportation System Changes:Ch. 13: Parking Pricing and FeesCh. 15: Land Use and Site DesignCh. 17: Transit Oriented Design
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Land Use Strategies and Elasticities
StrategyBuilt Environment
Variable Elasticity
Concentration of Population and Households
Population and/or Household Density -0.04
Diversity of Land Uses Land Use MixJobs/Housing Balance
-0.09-0.02
Design Intersection/Street DensityPercent 4-way Intersection
-0.12
-0.12
Accessibility Job Accessibility by AutomobileJob Accessibility by Transit
-0.20
-0.05
Transit Distance to Nearest Transit Stop
-0.05
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Assessment Tool Implementation
Currently implemented as an Excel® spreadsheet – some elements password protected
Long term implementation as application on Council website – facilitate maintenance of data from:Updates of travel forecast modelUpdates of air pollutant emission rates
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Assessment Tool Implementation
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Use of Assessment Tool
Local development data“Build” scenario data – typically from
development proposal“No-Build” scenario data – potential
sources: Existing development “Typical” recent development Previous planned development
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Assessment Tool Implementation
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Assessment Tool Implementation
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Assessment Tool Implementation
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Assessment Tool Implementation
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Assessment Tool Implementation
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Assessment Tool Implementation
Conclusions:This is not a tool to estimate actual total
emissions, just potential reductions between alternative land use scenarios.
Requires “Base Case” and “Alternative Land Use/Design” scenarios to calculate change in independent variable.
Can assist local decision makers in considering air quality impacts of land use decisions.
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An AQ Assessment Tool for Local Land Use Decisions
An AQ Assessment Tool for Local Land Use Decisions
MnAPA Annual Conference
September 28, 2011
St. Cloud, Minnesota
Mark Filipi, AICP [email protected]