LID LEED and Policy August 2010 (final) (handouts)
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Transcript of LID LEED and Policy August 2010 (final) (handouts)
LID and Policy: LID and Policy:
Sustainable Sustainable
Development PracticesDevelopment Practices
What is Stopping Us?What is Stopping Us?
Jon Barsanti JrJon Barsanti Jr
Masters in City and Regional PlanningMasters in City and Regional Planning
BA Interdisciplinary Study in Biology and ChemistryBA Interdisciplinary Study in Biology and Chemistry
[email protected]@alumni.unc.edu
919.943.1915919.943.1915
WhoWho
Developers
Policy
MakersDesigners
Decision Makers (Municipal/County)
WhyWhy
Competitive Advantage (Others are not Doing it)
It is good for the economy,
good for the community,
and good for the environment
Others are Doing It; Can
do It Better
Others are doing it and if
I/We don’t adopt/adapt I/We will lose out to other
communities/developers
WhyWhy
NotNot
New Way of Doing Business
Perceived Costs
Elected
Official
Resistance
New Way to Design
New Way of Developing Land/
Approving Plans
LandUse
Transportation WaterQuantity/Water Quality
All Development Occurs in All Development Occurs in
a Watersheda Watershed
All Land Uses have a Water ProfileAll Land Uses have a Water Profile
Undeveloped Land can be valuableUndeveloped Land can be valuable
LID & LEED can improve Water LID & LEED can improve Water
Quality and Quantity; Cost LessQuality and Quantity; Cost Less
Need to view RunNeed to view Run--off as a Resourceoff as a Resource
All Development Occurs All Development Occurs
in a Watershedin a Watershed
Three Parts:
Watershed Critical Areas
Watershed Protected Areas
Remainder of the Watershed
Barriers:
• “Highest and Best Use of the Land;”
• One person’s/community’s out-flow is another’s intake
Wetlands are more than Wetlands are more than
Undevelopable LandUndevelopable Land
Wetlands are nature’s filtration system
Wetlands manage volume and sediment load
Wetlands are key to wildlife habitat preservation
Barrier: Wetland is undevelopable; Can fill and replace, although manufactured is not as good as natural
Stream Buffers Impact Development Stream Buffers Impact Development
Developments Impact Stream Developments Impact Stream
BuffersBuffers
Stream Buffers protect encroachment on ecosystem by
development
Stream Buffers Protect development from
encroachment by ecosystem (e.g. floods.)
Barriers: Inconsistent setbacks between communities;
Vertical versus Horizontal Setbacks
All Land Uses have a All Land Uses have a
Pollutant/VolumePollutant/Volume ProfileProfile
From Kimberly Brewer’s Presentation to the TJCOG Smart Growth Committee
ftp://ftp.tjcog.org/pub/tjcog/regplan/smrtgrow/devwq.pdf
Volume of water flow
Nutrients
Temperature of water flowing off the land
Toxins
Bacteria
All Land Uses have a All Land Uses have a
Pollutant/VolumePollutant/Volume ProfileProfile
Data from A Nutrient Credit Trading Framework for the Jordan Lake Watershed: Using Market-Based Mechanisms to Make Watershed Restoration More Cost-Effective
http://www.cfra-nc.org/documents/FinalReport-FullReport_000.pdf
Sources Land-Use Contribution to N Load
Contribution to P Load
Residential (SF) 14%29% 12%
Residential (MF) 1%
Agriculture 20% 36% 51%
Forest 56% 19% 15%
Commercial/ Industrial
3% 9% 6%
Other 6% 7% 16%
http://www.cwp.org/Resource_Library/Center_Docs/PWP/ELC_PWP36.pdf
Soil Compaction Occurs in almost all situations
How much is reversible?
http://www.cwp.org/Resource_Library/Center_Docs/PWP/ELC_PWP36.pdf2.652.65QuartziteQuartzite
2.22.2Concrete PavementConcrete Pavement
1.6 to 2.11.6 to 2.1ROW and Building Pads ROW and Building Pads
(95% Compaction)(95% Compaction)
1.5 to 1.81.5 to 1.8ROW and Building Pads ROW and Building Pads
(85% Compaction)(85% Compaction)
1.8 to 2.01.8 to 2.0Athletic FieldsAthletic Fields
1.8 to 2.01.8 to 2.0Urban Fill SoilsUrban Fill Soils
1.5 to 2.01.5 to 2.0Crushed Rock Parking LotCrushed Rock Parking Lot
1.5 to 1.91.5 to 1.9Urban LawnsUrban Lawns
1.6 to 2.01.6 to 2.0Glacial TillGlacial Till
1.0 to 1.21.0 to 1.2Organic Silts/ClaysOrganic Silts/Clays
1.2 to 1.51.2 to 1.5Silt LoamsSilt Loams
1.3 to 1.41.3 to 1.4SiltSilt
1.41.4Silty sandsSilty sands
1.1 to 1.31.1 to 1.3Sandy SoilSandy Soil
1.01.0CompostCompost
0.2 to 0.30.2 to 0.3PeatPeat
Surface Bulk Surface Bulk
Density (g/cc)Density (g/cc)Undisturbed Soil Type or Urban Undisturbed Soil Type or Urban
ConditionCondition
Table 1: Comparison of Bulk Density for undisturbed Table 1: Comparison of Bulk Density for undisturbed
Soils and Common Urban Conditions (Compiled from Soils and Common Urban Conditions (Compiled from
various sources)various sources)
Reversing Compacted SoilsReversing Compacted Soils
• Soil Amendments
• Compost Amendments
• Reforestation
• Timehttp://www.cwp.org/Resource_Library/Center_Docs/PWP/ELC_PWP37.pdf
Benefits of Compost Benefits of Compost
AmendmentsAmendments
Compost Amendments Can:
• Increase Porosity
• Reduce Peak Flows
• Produce Thicker lawns
• Reduce Fertilizer Applications and Watering Needs
• Create better lawns, faster
http://www.epa.gov/ednnrmrl/publications/reports/epa600r00016/epa600r00016.pdf EPA/600/R-00/016
Impacts of Compost Impacts of Compost
AmendmentsAmendmentsCompost Amendments May:
• Increase Concentrations of N and • Decrease Total N & P
• Amendments can be tilled or applied
directly and reseeded.
• 2:1 ratio soil to compost tilled to at least 12 inches
• Construction compaction can reach 24 inches
http://www.epa.gov/ednnrmrl/publications/reports/epa600r00016/epa600r00016.pdf EPA/600/R-00/016
Barriers: It takes time and money to measure predevelopment conditions and
post-development conditions
Cost to amend soil decreases, per lot, as area amended increases
Other perspectives on Other perspectives on
Compost AmendmentsCompost Amendments
LID Can Improve Water LID Can Improve Water
Quality & Water QuantityQuality & Water Quantity
How we develop
Where we develop (and where we do not)
What we do with the Run-off (Pipe or Percolate)
LID Can Improve Water LID Can Improve Water
Quality & Water QuantityQuality & Water Quantity
http://www.epa.gov/smartgrowth/water_resource.htm http://www.epa.gov/smartgrowth/water_density.htm
LID Can Improve Water LID Can Improve Water
Quality & Water QuantityQuality & Water Quantity
http://www.jordancove.uconn.edu/jordan_cove/publications/final_report.pdf
• Impacts on Land Start At the Grading Stage
• Fertilizers can have an impact on water quality, even in LID Neighborhoods
• Volume and Peak Flows were
kept at predevelopment levels.
• Need to Control Compaction,
Minimize Soil Disturbance, and have on-site supervision.
LID Can Improve Water LID Can Improve Water
Quality & Water QuantityQuality & Water Quantity
http://www.nahb.org/fileUpload_details.aspx?contentID=112936
Negatively Impacts water-related
ecosystems
• Impacts water Quality through
• Impervious Surfaces
• Introduction of Contaminants
• Site Location of Development relative to natural features
LID Can Improve Water LID Can Improve Water
Quality & Water QuantityQuality & Water Quantity
http://www.nahb.org/fileUpload_details.aspx?contentID=112936
National Association of Home-Builders has a large amount of information regarding costs and benefits of Low Impact Development
Perceived Barrier: It costs more and does not provide a benefit to the builder
Actual Barrier: Educating the entire community to the value versus costs of LID (Lower Stormwater Costs, more land can be developed; cost savings to the community, etc.)
LID Can Improve Water LID Can Improve Water
Quality & Water QuantityQuality & Water Quantity
http://www.epa.gov/owow/nps/lid/costs07/documents/reducingstormwatercosts.pdf
… (In) the vast majority of cases,significant savings were realized due to:
• reduced costs for site grading and preparation,
• stormwater infrastructure, site paving, and landscaping.
• Total capital cost savings ranged from 15to 80 percent when LID methods were used...
LID Can Improve Water LID Can Improve Water
Quality & Water QuantityQuality & Water Quantity
http://www.epa.gov/owow/nps/lid/costs07/documents/reducingstormwatercosts.pdf
LID Can Improve Water LID Can Improve Water
Quality & Water QuantityQuality & Water Quantity
Managing stormwater in Pierce County: Kensington Estates case study sheds light on low impact development
http://www.djc.com/news/en/11135654.html
• Site Design was 103 Lots on 24 Acres
• Conventional Site Design required 270,000 Cu Ft of
Stormwater Facilities
• LID Required 55,000 cu ft of stormwater facilities
• 62% of land was saved as open space
• Cost Savings of 20% to the Developer
• 10% More units were able to be built than conventional design would have allowed.
LID: How do we define LID: How do we define
conservation/disturbedconservation/disturbed
Type of Residential Type of Residential
DevelopmentDevelopmentDisturbed Disturbed
SpaceSpaceOpen SpaceOpen Space Conserved SpaceConserved Space
Low Density Low Density
(e.g. 1 unit/2a)(e.g. 1 unit/2a)Could be entire Could be entire
sitesiteYes Yes –– may be may be
yardyardNoNo
ClusterCluster Could Be entire Could Be entire
sitesiteFragmentedFragmented NoNo
Open SpaceOpen Space 50% or less50% or less 50% or More50% or More Open Space can Open Space can
be undevelopablebe undevelopable
ConservationConservation Less than 50%Less than 50% More than 50% More than 50% Undevelopable Undevelopable
area excludedarea excluded
Barrier(s): How each is defined varies by community/county
Need to change thinking from Need to change thinking from
stormwater as waste to stormwater as waste to
stormwater as resource.stormwater as resource.
http://waterparadigm.org/indexen.php?web=./home/homeen.html http://www.onthecommons.org/media/pdf/original/OurWaterComonsOctober2008English.pdf
Barrier: Need to change the way we think about water
Need to change thinking from Need to change thinking from
stormwater as waste to stormwater as waste to
stormwater as resource.stormwater as resource.
http://www.clemson.edu/restoration/events/past_events/sc_water_resources/t4_proceedings_presentations/t4_zip/zimmer.pdf
http://www.coe.neu.edu/environment/DOCUMENTS/Wingspread%20Final%20Report.pdf
Barrier: We cannot solve our problems at the same level of thinking that created them
We need a new way of looking at our water quality and water quantity problems
Need to change from Need to change from
Environment or Economy to Environment or Economy to
Environment & EconomyEnvironment & Economy
http://www.coe.neu.edu/environment/DOCUMENTS/Wingspread%20Final%20Report.pdf
“An urban area is an ecological system wherein humans, habitat,
transportation and water infrastructure, and terrestrial and aquatic flora and fauna exist in symbiosis and interdependence.
Urban fresh waters are the lifeline for ecological and economical sustainability, yet the fresh water resources are being impaired to a point
that the integrity of urban waters has been damaged by excessive development and overuse….”
Need to Change thinking from Need to Change thinking from
stormwater as waste to stormwater as waste to
stormwater as resourcestormwater as resource..
http://www.coe.neu.edu/environment/DOCUMENTS/Wingspread%20Final%20Report.pdf
The concept of the Cities of the Future, the fifth paradigm of urbanization… is a paradigm of integration
• Future, and existing, urban developments will accommodate
landscape, drainage, transportation and habitat infrastructure systems
• Cities will be resilient to extremehydrological events and pollution
• There will be an optimal balance between recreation, navigation and other economic uses of water.
Need to make sure ordinances Need to make sure ordinances
do not prohibit LID AND that do not prohibit LID AND that
they allow LID practices.they allow LID practices.
SESSION LAW 2009-243
HOUSE BILL 749
“…. No State, county, or local building code or regulation shall prohibit the use of cisterns to provide water for flushing toilets and for outdoor irrigation. Asused in this subsection....”
All Development Impacts Water Quality
Highest use versus the best use of the land
Wetlands and stream buffers are undervalued
One community’s outflow is another
community’s intake
Reducing usage of drinking water for irrigation and toilets
Water is Water Water is Water
Paradigm ShiftParadigm Shift
Barriers to Implementing Barriers to Implementing
LEED Across the RegionLEED Across the RegionSimilar to Implementing LID
“Everybody knows….” it costs more.
http://www.usgbc.org/ShowFile.aspx?DocumentID=2908
Barriers to Implementing Barriers to Implementing
LEED Across the RegionLEED Across the Region•
Sometimes, its is not about the costs (price,)
rather it is really playing up the benefits
http://www.usgbc.org/ShowFile.aspx?DocumentID=2908
Barriers to Implementing Barriers to Implementing
LEED Across the RegionLEED Across the Region
Cost premiums ranging from ZERO% to 6.27%
Energy Savings from
23% to 50%
Water Savings from Zero to 78%
http://www.usgbc.org/ShowFile.aspx?DocumentID=2908
Case Study: Residential Case Study: Residential
DevelopmentDevelopment
http://pdfserve.informaworld.com/316990__914017852.pdf
• 73 Projects
• Range Under 5 Acres to Over
100 Acres
• Utilization of LEED techniques
depend on points awarded and cost to develop
• Gold and Platinum Certified Utilize Green Technologies and Green Construction
• Platinum tend to include
affordable housing and Habitat/wetland restoration
Photograph: Chuck Burton AP May 5, 2010 News and Observer
Halted construction fills N.C. waterways with silt BY PAGE IVEY - The Associated Press
"When all the plants have grown up, you
don't actually see any of the green plastic. It's just a lush green environment on top of the pond, so in theory there's a habitat for fish, frogs, wildlife as well." Ryan Winston
Our Floating Future?Our Floating Future?• Research by NC State University and Bill Hunt
• Being Tested in City of Durham – Hillendale Golf Course and Museum of Life and Science
• Originated in Montana (2000)
• Costs: $30/sq ft
• Benefit: “natural”removal of Phosphorus and Nitrogen using wetland/bog plants
News and Observer – 4/14/2010
Barriers to Implementing Barriers to Implementing
LID Across the RegionLID Across the Region
Need to look at Decentralized solution for a Decentralized problem
Our ordinances hold us back
“Everybody knows….”
Maintaining it after it is built
ConclusionConclusionWe have a new resource
We can ‘sing from the same songbook.’
We can customize our solutions to meet the requirements of our
communities and our region.
We can have a Win-Win-Win for the consumer, the developer, and the community.
If we ‘only’ apply to new construction, existing conditions
will ‘only’ not get worse.
Jon Barsanti Jr.Jon Barsanti Jr.
[email protected]@alumni.unc.edu
919.943.1915919.943.1915
Presentation available atPresentation available athttp://www.slideshare.net/JonBarsantiJrhttp://www.slideshare.net/JonBarsantiJr