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NYC Green Infrastructure Program

The Sustainable City: Roundtable on Science, Urban Ecosystem Services, and Green Infrastructure

May 19, 2015

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NYC Combined Sewered Area

7,400 miles of sewers

• 3,337 miles of combined

• 2,271 miles of sanitary

• 1,801 miles of storm

• 400 acres of Bluebelts (draining 14,500 acres)

Combined sewers in 60% of the city

*Above statistics in process of being updated

NYC’s Combined Sewer Area

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Water Quality in New York City Harbor

= does not meet water quality standards

(pathogens/DO)

75% of Harbor meets pathogen standards for swimming

19% meets standards for boating and fishing

7% of our Harbor is made up of tributaries that do not meet secondary contact standards

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GI Application Rates and Milestone Schedule

2010 2015 2020 2025 20300%

1%

2%

3%

4%

5%

6%

7%

8%

9%

10%

Initial 1.5%

Additional 2.5%

Additional 3.0%

Final 3%

DEP has committed to spend $1.5 billion in green infrastructure projects through 2030.

Overall Goal: To manage 1” of stormwater runoff from 10% of impervious surfaces in combined sewer areas by 2030

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GI Program OverviewProgrammatic Areas:

• Right of Way GI Design/Construction:

• Area-wide implementation of Bioswales and Stormwater Greenstreets

• Adding GI to scope of existing capital highway and sewer projects

• Public Property Retrofits:• School yards, playgrounds, public housing, parklands, parking lots

• Green Infrastructure Grant Program:

• $ 11.5M committed to 29 projects

• Additional Program Areas:

• Research and Development

• Neighborhood Demonstration Areas

• O&M/Asset Management Program

• Outreach and Engagement Program

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Area-wide Right of Way Construction

Example: 26th Ward/Jamaica Bay CSO Area Anticipated construction completion December 2015

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Right-of-way Bioswale

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Stormwater Greenstreet

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Public Property

Retrofit Projects

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Hope Gardens Houses, Brooklyn - Before

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Hope Gardens Houses, Brooklyn - After

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Edenwald Houses, Bronx

Downspout Disconnect

Type of green infrastructure

Construction Start: Spring 2015

Construction End: Spring 2017

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Rain Garden

Porous Paving

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Schoolyards with DOE and TPL

Before After

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Private Property

Grant Projects

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Brooklyn Navy Yard – Rooftop Farm

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Bishop Loughlin – Green Roof

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Queens College – Rain Garden and Pavers

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Lenox Hill Neighborhood House- Green Roof

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New York Restoration Project – Rain Garden/Pavers

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Measuring Co-Benefits of

Green Infrastructure

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Cost and Benefit Comparison Tool

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Jamaica Bay/26W-003, CB 16 – Current Construction

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Additional Benefits for Community Board 16

Public Health Benefits:

• Individual bioswales show

Temperatures can be 15% lower than

sidewalk and street.

• 63 lbs of ozone removed per year

• 46 lbs of PM10 removed per year

• 46 lbs of nitrogen dioxide removed

per year

• 25 lbs of sulfur dioxide removed

per year

Ecosystem Benefits:

• Improved ecosystem, greenspace,

and well being for residents and

desirability of neighborhoods.

Economic Benefits:

• 245 jobs supported over lifetime

For the 423 bioswales and stormwater greenstreets to be installed in CB16, the possible co-benefits per year could be:

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Preliminary Analysis

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1,200 Right-of-way Bioswales TotalTotal GI Footprint (ft²)* 90,000Total Net CO2 Produced (lb/yr) 181,200 Total CO2 Produced (lb/yr) 274,800

Total Carbon Sequestered (lb/yr) 86,400 Total Inferred CO2 Reduction (lb/yr) 7,836Total Ozone Removed (lb/yr) 180Total PM10 Removed (lb/yr) 132Total NO2 Removed (lb/yr) 132Total SO2 Removed (lb/yr) 72Total CO Removed (lb/yr) 24Total Jobs Supported 374Total Treatment Savings ($/yr) 408Urban Heat Island Reduction (%) 14

This table shows estimated additional benefits for first phases of construction in area-wide ROW contracts.

*ROWBs vary in size from 10’x5’ to 20’x5’ pending siting procedures. These estimates are based on 15’x5’**While Net CO2 Production for ROWB is positive, DEP assumes that this number is significantly less than what would be produced by gray infrastructure construction.

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Thank You.

Margot Walker

Director, Capital Planning and Partnerships

Office of Green Infrastructure

margotw@dep.nyc.gov

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