Water
August 20 Forum
Häfele Showroom
S.W.I.M.

• Clean Water Act = Fishable and Swimmable

• Storm Water Infrastructure Matters

• Over 45 members, including G...
PROBLEM
• CSO = combined sewer
  overflow

• More than 27 billion
  gallons of untreated
  stormwater and raw
  sewage per...
SOLUTION
• Green infrastructure, Low
  Impact Development
  (LID), Best Management
  Practice (BMP), Source
  Control

• I...
Natural Resources Defense Council
 • Larry Levine, Project Attorney
 • a S.W.I.M. member organization
 • Local Law 5 – req...
Local Law 5
• Mayor’s Office of Long Term Planning and
  Sustainability has lead responsibility; quarterly public
  meetin...
Local Law 5
Example BMPs:
• Rain gardens
• Downspout disconnection
• Green roofs
• Enhanced street tree pits and planting ...
Sustainable South Bronx

• Rob Craudereuff

• Green Roof Tax Abatement

• Passed NYS in June 2008
Rob Crauderueff
SUSTAINABLE SOUTH BRONX
USA             USA
  5%         =   25%
 World’s         ?
Population
USA          USA
  5%      =   25%
 World’s      World’s
Population Incarcerated
•Problems to be addressed:
            •Unemployment: 25%
       •Living in POVERTY: 40%
 •Median Household Income: $20K
Bronx Ecological Stewardship Training
Source: Columbia University Urban Planning Studio, 2006 Instructors:
J. Rosenthal & K. Bakewell
Green Roof Tax Abatement
• $4.50/s.f. up to $100,000

• 3 year maintenance plan

• Agreement for City to inspect

• Applic...
Green Roof Tax Abatement
• At least 50% of the roof, green roof defined
  as:
  –   Roof Membrane
  –   Root Barrier
  –  ...
EDAW
• Timothy Terway

• Urban Design Meets Urban Ecology

• Interdisciplinary Practice: Different Disciplines
  engaged i...
How do we make this….   function like this?
Green Stormwater Infrastructure:
             What is it?
• Integrated, landscape-based
  approach to sustainable
  develo...
Stormwater               Complimentary
    Goals                    Goals
• Water quality improvement   • Wildlife habitat...
The NEW Paradigms – Urban
       Water Cycle
Landscape Transition




                       SFPUC 2007
What is your primary goal?
– Water quality
– Aquifer recharge
– Combined Sewer Overflow (CSO) reduction
– Green streets
– ...
Toolkit
•   Green Roofs
•   Cisterns
•   Downspout Disconnection
•   Rain Gardens
•   Bio-Retention
•   Detention Basins
•...
Case Studies:
• Jordan Cove, CT
• 100 acre Urban Regeneration
  Masterplan (New York Metro)
Stormwater Research:
          Jordan Cove
• Was Designed to Determine Water
  Quantity/Quality Benefits of BMP’s
• Monito...
•   More info:
    www.jordancove.uconn.edu
Findings
                                                                                             Activity            ...
EDAW
•   Soils
Can you infiltrate on
                        •   Depth to groundwater
      site?
                        •   L...
Using the Toolkit
Tools that require
  infiltration:
   – Rain gardens
   – Pervious Pavement

Tools that do not
  require...
Gauging Impact of Tools
Functions of Tools
               Runoff         Rainwater   Landscaping   Infiltration     Conveyance     WQ
            ...
General Rule of Thumbs
• Sizing: 4% of catchment
• Vegetation: Native vegetation, drought tolerant,
  medium to tall stem ...
BMP Sizing Factor Summary
Under-Drain or Infiltration:
                    IMP        Sizing Factors
              Flow-  ...
Next Month’s Forum:
International Green Building Showcase


          September 17
          Location TBA
Stormwater GreenHomeNYC August 2008
Stormwater GreenHomeNYC August 2008
Stormwater GreenHomeNYC August 2008
Stormwater GreenHomeNYC August 2008
Stormwater GreenHomeNYC August 2008
Stormwater GreenHomeNYC August 2008
Stormwater GreenHomeNYC August 2008
Stormwater GreenHomeNYC August 2008
Stormwater GreenHomeNYC August 2008
Stormwater GreenHomeNYC August 2008
Stormwater GreenHomeNYC August 2008
Stormwater GreenHomeNYC August 2008
Stormwater GreenHomeNYC August 2008
Stormwater GreenHomeNYC August 2008
Stormwater GreenHomeNYC August 2008
Stormwater GreenHomeNYC August 2008
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Stormwater GreenHomeNYC August 2008

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Presenters: S.W.I.M., NRDC, Sustainable South Bronx, NRDC.

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Stormwater GreenHomeNYC August 2008

  1. 1. Water August 20 Forum Häfele Showroom
  2. 2. S.W.I.M. • Clean Water Act = Fishable and Swimmable • Storm Water Infrastructure Matters • Over 45 members, including Gowanus Dredgers, Nos Quedamos, Cook + Fox, NRDC, Sustainable South Bronx • www.swimmablenyc.info
  3. 3. PROBLEM • CSO = combined sewer overflow • More than 27 billion gallons of untreated stormwater and raw sewage per year • 460 CSOs in NYC
  4. 4. SOLUTION • Green infrastructure, Low Impact Development (LID), Best Management Practice (BMP), Source Control • Interagency BMP Task Force • Citizen Implementation
  5. 5. Natural Resources Defense Council • Larry Levine, Project Attorney • a S.W.I.M. member organization • Local Law 5 – requires a “Sustainable Stormwater Management Plan” for NYC – 1/30/08: Intro 630-A approved unanimously – 2/19/08: Bloomberg signs into law – 10/1/08: First draft due, for public review & comment – 12/1/08: Final Plan DUE
  6. 6. Local Law 5 • Mayor’s Office of Long Term Planning and Sustainability has lead responsibility; quarterly public meetings to solicit input – next meeting anticipated in Oct. • Key Plan Elements: – focus on “green infrastructure” – code revisions for new development and redevelopment – financial and other incentives for retrofitting – design specs for public projects – long-term and interim goals and milestones – public notification of CSO events • Complete progress report due every 2 years
  7. 7. Local Law 5 Example BMPs: • Rain gardens • Downspout disconnection • Green roofs • Enhanced street tree pits and planting strips • Rain barrels • Pervious pavement • Rainwater harvesting • Water conservation; greywater re-use • Stormwater Utility Fee (separated from water rates)
  8. 8. Sustainable South Bronx • Rob Craudereuff • Green Roof Tax Abatement • Passed NYS in June 2008
  9. 9. Rob Crauderueff SUSTAINABLE SOUTH BRONX
  10. 10. USA USA 5% = 25% World’s ? Population
  11. 11. USA USA 5% = 25% World’s World’s Population Incarcerated
  12. 12. •Problems to be addressed: •Unemployment: 25% •Living in POVERTY: 40% •Median Household Income: $20K
  13. 13. Bronx Ecological Stewardship Training
  14. 14. Source: Columbia University Urban Planning Studio, 2006 Instructors: J. Rosenthal & K. Bakewell
  15. 15. Green Roof Tax Abatement • $4.50/s.f. up to $100,000 • 3 year maintenance plan • Agreement for City to inspect • Applications:1/1/09? - 3/15/13
  16. 16. Green Roof Tax Abatement • At least 50% of the roof, green roof defined as: – Roof Membrane – Root Barrier – Insulation – Drainage – Growth Medium (3 inches or irrigation or certified) – Vegetation (80% covered)
  17. 17. EDAW • Timothy Terway • Urban Design Meets Urban Ecology • Interdisciplinary Practice: Different Disciplines engaged in Studying Systems
  18. 18. How do we make this…. function like this?
  19. 19. Green Stormwater Infrastructure: What is it? • Integrated, landscape-based approach to sustainable development • Set of strategies to maintain existing natural systems, hydrology, ecology • Flexible approach based on a toolkit of simple techniques
  20. 20. Stormwater Complimentary Goals Goals • Water quality improvement • Wildlife habitat – Filter pollutants and • Greening cities, contaminants aesthetics • Recreation and open • Water conservation space • Peak flow control • Environmental education & stewardship • Volume reduction • Shading / heat island reduction
  21. 21. The NEW Paradigms – Urban Water Cycle
  22. 22. Landscape Transition SFPUC 2007
  23. 23. What is your primary goal? – Water quality – Aquifer recharge – Combined Sewer Overflow (CSO) reduction – Green streets – Flood reduction
  24. 24. Toolkit • Green Roofs • Cisterns • Downspout Disconnection • Rain Gardens • Bio-Retention • Detention Basins • Constructed Wetlands • Permeable Paving • Stream Daylighting • Urban Forest
  25. 25. Case Studies: • Jordan Cove, CT • 100 acre Urban Regeneration Masterplan (New York Metro)
  26. 26. Stormwater Research: Jordan Cove • Was Designed to Determine Water Quantity/Quality Benefits of BMP’s • Monitoring took place over 10 years
  27. 27. • More info: www.jordancove.uconn.edu
  28. 28. Findings Activity Traditional ($) BMP ($) Cul-de-sac bioretention 1,275 2,183 Driveway (asphalt)/lot 2,800 -- Driveway (paver)/lot -- 7,896 Erosion & sediment 322 625 control/lot 1. To implement BMPs on 100% of the lots in the BMP portion of the subdivision - goal met. Plantings 500 650 2. To maintain post-development peak runoff rate and volume at levels equal to predevelopment rates. – volume and peak rate goal met Planning and design/lot 401 808 3. To maintain post-development loading of TSS at levels equal to predevelopment rates – goal not met. Road and curb 23,494 102,500 4. To retain sediment onsite during construction. – goal not met. 5. To reduce nitrogen export by 65% - goal met. Rain gardens/lot 0 575 6. To reduce bacterial export by 85%. – goal not met. Stormwater collection 7,770 3,600 7. To reduce phosphorus export by 40%. – goal met. 36,562 118,837
  29. 29. EDAW
  30. 30. • Soils Can you infiltrate on • Depth to groundwater site? • Liquefaction dangers • Underground utilities • Slope • Contamination
  31. 31. Using the Toolkit Tools that require infiltration: – Rain gardens – Pervious Pavement Tools that do not require infiltration: – Cisterns – Eco-roofs (or roof gardens) – Bioretention planters – Urban forest – Stormwater wetland – Detention basin
  32. 32. Gauging Impact of Tools
  33. 33. Functions of Tools Runoff Rainwater Landscaping Infiltration Conveyance WQ Minimization Capture Treatment Permeable Pavement O x x Bioretention x x O x O Bioswales x x O O Stormwater x x O x x Planters Green O x x Roofs Wetlands O x O Turf x x O x x Replacement Infiltration x O x Devices O Main function Source: Dan Medina, CH2MHill x Secondary Function
  34. 34. General Rule of Thumbs • Sizing: 4% of catchment • Vegetation: Native vegetation, drought tolerant, medium to tall stem height • Filter Media: Sandy Loam, < 5% fines (clays) • Pretreatment: Always incorporate pretreatment separated from system till catchment built out and veg. established 2/3 Veg Height 80%ile compliance in summer months Inundation tolerance
  35. 35. BMP Sizing Factor Summary Under-Drain or Infiltration: IMP Sizing Factors Flow- Group D: 0.05 Through Planter Vegetated/ Group A: Grassy 0.10 to 0.14 Swale Group D: 0.07 to 0.115 Group A – low runoff potential (<10% clay) Group D – high runoff potential (>40% clay) Bioretention Group A: 0.13 Basin Group D: 0.06 • Source: NRCS
  36. 36. Next Month’s Forum: International Green Building Showcase September 17 Location TBA
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